/* ===================================
   SMARTEN AI Assistant - Design System
   =================================== */

/* === CSS Variables === */
:root {
    /* Enhanced Color Palette - HSL-based for better harmony */
    --primary-600: hsl(239, 84%, 67%);
    --primary-500: hsl(239, 84%, 73%);
    --primary-400: hsl(239, 84%, 80%);
    --primary-300: hsl(239, 70%, 88%);
    --primary-50: hsl(239, 84%, 97%);

    --purple-600: hsl(271, 81%, 56%);
    --purple-500: hsl(271, 91%, 65%);
    --purple-400: hsl(271, 91%, 75%);

    --blue-600: hsl(221, 83%, 53%);
    --blue-500: hsl(221, 91%, 60%);
    --blue-400: hsl(221, 91%, 70%);

    --green-600: hsl(142, 71%, 45%);
    --green-500: hsl(142, 76%, 55%);
    --green-400: hsl(142, 76%, 65%);

    --orange-600: hsl(20, 91%, 48%);
    --orange-500: hsl(20, 95%, 55%);
    --orange-400: hsl(20, 95%, 65%);

    --error-50: #fef2f2;
    --error-500: #ef4444;
    --warning-500: #f59e0b;
    --success-500: #10b981;

    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-muted: #5a6270;
    /* Improved contrast: ~5.2:1 (was #6b7280 at ~4.6:1) */
    --border-color: var(--gray-200);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Enhanced Shadows - Premium feel */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-colored: 0 10px 30px -5px rgba(99, 102, 241, 0.3);
    --shadow-colored-lg: 0 20px 40px -10px rgba(99, 102, 241, 0.4);

    /* Animation Variables */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Accessibility */
    --focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.3);
    --focus-ring-offset: 2px;
}

/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    line-height: 1.6;
}

/* Remove default focus outline from all buttons and links */
button,
a,
input,
textarea,
select {
    -webkit-tap-highlight-color: transparent;
}

button:focus,
button:active,
a:focus,
a:active {
    outline: none !important;
    border: none !important;
    box-shadow: none !important;
}

/* Keep borders for form inputs */
input:focus,
input:active,
textarea:focus,
textarea:active {
    outline: none !important;
}

/* Remove any focus rings or borders from non-input elements */
*:focus:not(input):not(textarea):not(select) {
    outline: none !important;
}

button::-moz-focus-inner,
a::-moz-focus-inner {
    border: 0 !important;
    outline: none !important;
}

/* === Layout === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* === Header === */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-md);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.01em;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--gray-100);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
}

.nav-btn {
    padding: 0.5em 1.5em;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    text-decoration: none;
    display: inline-block;
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-btn.active {
    background: white;
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.nav-btn:focus,
.nav-btn:active {
    outline: none;
}

.nav-btn:focus-visible {
    outline: 2px solid var(--primary-400);
    outline-offset: 2px;
}

/* === Auth Buttons === */
.auth-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.auth-link-btn {
    padding: 0.5em 1.5em;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-block;
    border: 2px solid var(--primary-600);
    color: var(--primary-600);
    background: transparent;
}

.auth-link-btn:hover {
    background: var(--primary-50);
}

.auth-link-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border-color: transparent;
}

.auth-link-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.auth-link-btn:focus,
.auth-link-btn:active,
.auth-link-btn.primary:focus,
.auth-link-btn.primary:active {
    outline: none !important;
    box-shadow: none !important;
    border: 2px solid var(--primary-600) !important;
}

.auth-link-btn.primary:focus,
.auth-link-btn.primary:active {
    border-color: transparent !important;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600)) !important;
}

.auth-link-btn:focus-visible {
    outline: 2px solid var(--primary-400);
    outline-offset: 2px;
}

.auth-link-btn.primary:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

/* Additional universal button fix */
button.auth-link-btn,
a.auth-link-btn,
button.nav-btn,
a.nav-btn,
button.filter-btn,
a.action-card {
    border-top: none !important;
    border-left: none !important;
    border-right: none !important;
    border-bottom: none !important;
}

button.filter-btn:focus,
button.filter-btn:active,
a.action-card:focus,
a.action-card:active {
    outline: none !important;
    box-shadow: none !important;
    border: none !important;
}

/* === User Menu (logged in state) === */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-menu form {
    display: inline;
    margin: 0;
}

.user-email {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.logout-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all 0.2s ease;
}

.logout-btn svg {
    width: 16px;
    height: 16px;
}

.logout-btn:hover {
    border-color: var(--error-500);
    color: var(--error-500);
    background: var(--error-50);
}

.logout-btn:focus {
    outline: none;
    border-color: var(--error-500);
}

/* === Main Content === */
.main {
    padding: var(--spacing-2xl) 0;
}

/* Sub-navigation wrapper */
.sub-nav-wrapper {
    margin-bottom: var(--spacing-xl);
}

.sub-nav-wrapper .nav {
    display: inline-flex;
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === Grid Layouts === */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.progress-grid {
    display: grid;
    gap: var(--spacing-xl);
}

/* === Panel Component === */
.panel {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.panel-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to right, var(--gray-50), white);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.panel-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.panel-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.panel-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: var(--spacing-md);
}

.panel-body {
    padding: var(--spacing-xl);
}

/* === Proficiency Badge === */
.proficiency-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-500), var(--purple-500));
    color: white;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.badge-label {
    opacity: 0.9;
}

.level-select {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.25em 0.5em;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.level-select:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.level-select:focus {
    background: rgba(255, 255, 255, 0.35);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.level-select option {
    background: var(--primary-600);
    color: white;
}

/* === Writing Controls === */
.writing-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.control-btn {
    padding: 0.5em 1.5em;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-btn svg {
    width: 16px;
    height: 16px;
}

.control-btn:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
    background: var(--gray-50);
}

.control-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border: none;
    box-shadow: var(--shadow-md);
}

.control-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* === Writing Task Content Area === */
.task-content-area {
    background: linear-gradient(135deg, var(--gray-50) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.task-content {
    margin: 0;
}

.task-prompt {
    color: var(--text-primary);
    margin: 0;
    line-height: 1.6;
    font-size: 0.95rem;
}

.task-prompt .task-type {
    display: inline-block;
    background: var(--primary-50);
    color: var(--primary-600);
    padding: 0.15em 0.5em;
    border-radius: var(--radius-sm);
    font-size: 0.8em;
    font-weight: 500;
    margin-right: var(--spacing-xs);
}

/* Loading state for control buttons */
.control-btn.loading {
    pointer-events: none;
}

.control-btn.loading svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* === Editor === */
.editor-wrapper {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.text-editor {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-primary);
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--gray-50);
}

.text-editor:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
    background: white;
}

.editor-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: var(--spacing-lg);
    pointer-events: none;
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.8;
    color: transparent;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.error-highlight {
    background: rgba(239, 68, 68, 0.2);
    border-bottom: 2px wavy var(--error-500);
    border-radius: var(--radius-sm);
}

/* === Editor Stats === */
.editor-stats {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
}

.stat-label {
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    color: var(--text-primary);
    font-weight: 600;
}

.stat-value.error {
    color: var(--error-500);
}

/* === Adaptive Indicator === */
.adaptive-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--success-500);
    color: white;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
}

.indicator-dot {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* === Feedback === */
.feedback-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 400px;
}

.empty-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-500), var(--purple-500));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: var(--spacing-lg);
}

.empty-icon svg {
    width: 40px;
    height: 40px;
}

.empty-text {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 300px;
}

/* === Empty State for Lessons === */
.empty-state-lessons {
    text-align: center;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--radius-xl);
    min-height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-xl);
}

.empty-state-lessons .empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.8;
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.empty-state-text {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 400px;
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

.reset-filters-btn {
    padding: 0.75em 2em;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    box-shadow: var(--shadow-md);
}

.reset-filters-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}


.feedback-summary {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(147, 51, 234, 0.05));
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-600);
    margin-bottom: var(--spacing-lg);
}

.summary-title {
    font-weight: 600;
    color: var(--primary-600);
    margin-bottom: var(--spacing-sm);
}

.summary-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* === Error List === */
.error-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.error-item {
    padding: var(--spacing-lg);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.error-item:hover {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-md);
}

.error-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.error-type {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.error-type.grammar {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-500);
}

.error-type.vocabulary {
    background: rgba(249, 115, 22, 0.1);
    color: var(--orange-500);
}

.error-type.syntax {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-600);
}

.error-type.spelling {
    background: rgba(168, 85, 247, 0.1);
    color: var(--purple-500);
}

.error-text {
    font-family: 'Courier New', monospace;
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--error-500);
}

.error-original {
    text-decoration: line-through;
    color: var(--error-500);
}

.error-corrected {
    color: var(--success-500);
    font-weight: 600;
}

.error-explanation {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.error-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-100);
}

.error-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    color: var(--primary-600);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s ease;
}

.error-action-btn:hover {
    background: var(--gray-50);
}

.error-action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.error-action-btn:disabled:hover {
    background: none;
}

.btn-normal-state {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-loading-state {
    display: none;
    align-items: center;
    gap: 6px;
}

.error-action-btn.is-loading .btn-normal-state {
    display: none;
}

.error-action-btn.is-loading .btn-loading-state {
    display: inline-flex;
}

.btn-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid var(--gray-200);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    flex-shrink: 0;
}

.error-action-btn svg {
    flex-shrink: 0;
}

.error-action-response {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: 8px;
    font-size: 0.875rem;
}

.error-action-response p {
    margin: 0;
    line-height: 1.6;
    color: var(--text-primary);
}

.explanation-response {
    border-left: 3px solid var(--success-500);
}

.examples-response {
    border-left: 3px solid var(--primary-500);
}

.action-response-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.action-response-examples {
    white-space: pre-line;
}

@media (max-width: 768px) {
    .error-actions {
        flex-direction: column;
    }
}

.error-example {
    padding: var(--spacing-md);
    background: rgba(16, 185, 129, 0.05);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--success-500);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.example-label {
    font-weight: 600;
    color: var(--success-500);
    margin-bottom: var(--spacing-xs);
    display: block;
}

/* === Stats Grid === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--gray-50), white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-400);
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.stat-card-icon svg {
    width: 24px;
    height: 24px;
}

.stat-card-icon.purple {
    background: linear-gradient(135deg, var(--purple-600), var(--purple-500));
}

.stat-card-icon.blue {
    background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
}

.stat-card-icon.green {
    background: linear-gradient(135deg, var(--green-600), var(--green-500));
}

.stat-card-icon.orange {
    background: linear-gradient(135deg, var(--orange-600), var(--orange-500));
}

.stat-card-content {
    flex: 1;
}

.stat-card-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card-value.small {
    font-size: 1.25rem;
}

/* === Error Categories === */
.error-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.category-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-name {
    font-weight: 600;
    color: var(--text-primary);
}

.category-count {
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.category-bar {
    height: 12px;
    background: var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.category-progress {
    height: 100%;
    border-radius: var(--radius-lg);
    transition: width 0.5s ease;
}

.category-progress.grammar {
    background: linear-gradient(90deg, var(--error-500), #fca5a5);
}

.category-progress.vocabulary {
    background: linear-gradient(90deg, var(--orange-500), #fdba74);
}

.category-progress.syntax {
    background: linear-gradient(90deg, var(--primary-600), var(--primary-400));
}

.category-progress.spelling {
    background: linear-gradient(90deg, var(--purple-600), var(--purple-400));
}

/* === Examples Grid === */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.example-card {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--gray-50), white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.example-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-400);
}

.example-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.example-text {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.example-source {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* === Responsive Design === */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header {
        padding-bottom: var(--spacing-sm);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav {
        width: 100%;
        justify-content: center;
    }

    .nav-btn,
    .auth-link-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .examples-grid {
        grid-template-columns: 1fr;
    }

    .writing-controls {
        flex-direction: column;
    }

    .control-btn {
        justify-content: center;
    }

    /* Mobile Filters moved to end of file for precedence */
}

/* ===================================
   SMARTEN Lesson Pages - Styles
   =================================== */

/* === Page Header === */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.page-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
}

/* === Level Filters === */
.level-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.875em 1.75em;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-btn:hover {
    border-color: var(--primary-500);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-lg);
}

/* === Breadcrumb Navigation === */
.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.breadcrumb-item:hover {
    color: #ffffff;
    transform: translateY(-1px);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

.breadcrumb-item.active {
    color: #ffffff;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.breadcrumb-icon {
    width: 16px;
    height: 16px;
    opacity: 0.9;
}

.breadcrumb-separator {
    width: 14px;
    height: 14px;
    color: rgba(255, 255, 255, 0.5);
    stroke-width: 2.5;
}

/* === Unified Filter Panel === */
.filters-panel {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.filters-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.filters-row.divider {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-100);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-group-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-400);
    /* Lighter label */
    margin-right: var(--spacing-xs);
}

/* === Sort Dropdown === */
.sort-dropdown {
    position: relative;
}

.sort-dropdown select {
    padding: var(--spacing-sm) var(--spacing-lg);
    padding-right: var(--spacing-2xl);
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234b5563'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.25rem;
}

.sort-dropdown select:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
}

.sort-dropdown select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
}

/* === Skill Filters === */
.skill-filters {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.skill-filter-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5em 1em;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.skill-filter-item:hover {
    border-color: var(--primary-400);
    background: var(--gray-50);
}

.skill-filter-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-600);
}

.skill-filter-item.checked {
    border-color: var(--primary-600);
    background: rgba(99, 102, 241, 0.05);
    color: var(--primary-600);
}

/* === Context Back Button === */
.context-back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5em 1.5em;
    background: var(--gray-100);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    margin-bottom: var(--spacing-lg);
}

.context-back-btn:hover {
    background: var(--gray-200);
    color: var(--text-primary);
    transform: translateX(-2px);
}

/* === Level Badges === */
.level-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Add visual indicators beyond color for accessibility - NONE (Clean style) */
.level-badge.a2 {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.2);
}

.level-badge.b1 {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

/* === Lessons Grid === */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.lesson-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
}

.lesson-card.hidden {
    display: none;
}

.lesson-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.lesson-duration {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.lesson-duration svg {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.lesson-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.lesson-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.lesson-skills {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gray-100);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
}

.lesson-progress {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-600), var(--purple-600));
    border-radius: var(--radius-md);
    transition: width 0.5s ease;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.lesson-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    text-decoration: none;
    display: block;
}

.lesson-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* === Lesson View === */
.lesson-main {
    padding: var(--spacing-xl) 0;
}

.lesson-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

/* === Lesson Sidebar === */
.lesson-sidebar {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 100px;
}

.sidebar-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.lesson-progress-circle {
    display: flex;
    justify-content: center;
}

.circular-chart {
    display: block;
    max-width: 120px;
    max-height: 120px;
}

.circle-bg {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 3;
}

.circle {
    fill: none;
    stroke: url(#progressGradient);
    stroke-width: 3;
    stroke-linecap: round;
    animation: progress 1s ease-out forwards;
}

.percentage {
    fill: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.5em;
    font-weight: 700;
    text-anchor: middle;
}

.section-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.section-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.section-link:hover {
    background: var(--gray-50);
    color: var(--primary-600);
}

.section-link.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(147, 51, 234, 0.05));
    color: var(--primary-600);
    font-weight: 600;
}

.section-link.completed .section-check {
    display: block;
}

.section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--gray-200);
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: 700;
    flex-shrink: 0;
}

.section-link.active .section-number {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.section-link.completed .section-number {
    background: var(--success-500);
    color: white;
}

.section-name {
    flex: 1;
}

.section-check {
    display: none;
    color: var(--success-500);
    font-weight: 700;
}

.sidebar-actions {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.sidebar-btn {
    width: 100%;
    padding: 0.875em;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    text-align: center;
    text-decoration: none;
    display: block;
    transition: all 0.2s ease;
}

.sidebar-btn.secondary {
    background: var(--gray-100);
    color: var(--text-secondary);
}

.sidebar-btn.secondary:hover {
    background: var(--gray-200);
}

/* === Lesson Content === */
.lesson-content {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.lesson-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--border-color);
}

.lesson-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.lesson-title-main {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.lesson-objectives {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.lesson-section {
    margin-bottom: var(--spacing-2xl);
    scroll-margin-top: 120px;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-200);
    letter-spacing: -0.015em;
}

.content-block {
    line-height: 1.8;
    color: var(--text-secondary);
}

.content-block p,
.content-block ul {
    max-width: 70ch;
}

/* Enhanced line-length constraints for lesson sections */
.lesson-section p,
.lesson-section ul {
    max-width: 65ch;
}

.content-block h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.content-block h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.content-block p {
    margin-bottom: var(--spacing-md);
}

.lesson-list {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
}

.lesson-list li {
    margin-bottom: var(--spacing-sm);
}

/* === Special Content Boxes === */
.tip-box,
.formula-box,
.example-box,
.practice-prompt,
.ai-practice-box,
.congratulations-box {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
}

.tip-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(251, 191, 36, 0.05));
    border-left: 4px solid var(--warning-500);
    display: flex;
    gap: var(--spacing-md);
}

.tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.formula-box {
    background: var(--gray-100);
    border: 2px solid var(--border-color);
    text-align: center;
    font-size: 1.125rem;
    font-family: 'Courier New', monospace;
}

.example-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(147, 51, 234, 0.02));
    border-left: 4px solid var(--primary-600);
}

.example-explanation {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

.practice-prompt {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.1), rgba(168, 85, 247, 0.05));
    border: 2px dashed var(--purple-500);
}

.ai-practice-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(34, 197, 94, 0.05));
    border: 2px solid var(--success-500);
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.ai-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--success-600), var(--success-500));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.ai-icon svg {
    width: 32px;
    height: 32px;
}

.ai-content h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
}

.ai-btn {
    display: inline-block;
    padding: 0.5em 1.5em;
    background: var(--success-500);
    color: white;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.ai-btn:hover {
    background: var(--success-600);
    transform: translateY(-1px);
}

.congratulations-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(147, 51, 234, 0.05));
    border: 2px solid var(--primary-500);
    text-align: center;
}

.congrats-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

/* === Tables === */
.grammar-table {
    margin: var(--spacing-lg) 0;
    overflow-x: auto;
}

.grammar-table table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.grammar-table th {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
}

.grammar-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.grammar-table tr:last-child td {
    border-bottom: none;
}

.grammar-table tr:hover {
    background: var(--gray-50);
}

/* === Vocabulary Grid === */
.vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.vocab-card {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.vocab-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-400);
}

.vocab-word {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--spacing-sm);
}

.vocab-definition {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.vocab-example {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

/* === Exercises === */
.exercise-block {
    background: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
}

.exercise-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.exercise-instruction {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.question {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.option:hover {
    border-color: var(--primary-400);
    background: var(--gray-50);
}

.option input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.option.correct {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success-500);
}

.option.incorrect {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--error-500);
}

.feedback {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    display: none;
}

.feedback.show {
    display: block;
}

.feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-600);
    border-left: 4px solid var(--success-500);
}

.feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-600);
    border-left: 4px solid var(--error-500);
}

.check-btn {
    margin-top: var(--spacing-lg);
    padding: 0.875em 2em;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.check-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.exercise-score {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    text-align: center;
    font-size: 1.25rem;
    font-weight: 700;
    display: none;
}

.exercise-score.show {
    display: block;
}

/* === Section Complete Button === */
.section-complete-btn {
    margin-top: var(--spacing-xl);
    padding: 0.875em 1.75em;
    background: var(--gray-200);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.section-complete-btn:hover {
    background: var(--gray-300);
}

.section-complete-btn.completed {
    background: var(--success-500);
    color: white;
    border-color: var(--success-500);
}

/* === Summary === */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.summary-card {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.summary-card h4 {
    color: var(--success-500);
    margin-bottom: var(--spacing-sm);
}

.next-steps {
    margin-top: var(--spacing-2xl);
}

.next-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.action-btn {
    padding: 0.875em 2em;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s ease;
    display: inline-block;
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.action-btn.secondary {
    background: var(--gray-200);
    color: var(--text-secondary);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* === Use Cases === */
.use-case {
    margin: var(--spacing-lg) 0;
}

/* === Responsive === */
@media (max-width: 1024px) {
    .lesson-container {
        grid-template-columns: 240px 1fr;
    }
}

@media (max-width: 768px) {
    .lesson-container {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: static;
        margin-bottom: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .lessons-grid {
        grid-template-columns: 1fr;
    }

    .vocab-grid {
        grid-template-columns: 1fr;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }

    .next-actions {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
    }
}

/* ===================================
   SMARTEN Dashboard - Additional Styles
   =================================== */

/* === Welcome Section === */
.welcome-section {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
}

.welcome-content {
    flex: 1;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.welcome-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.welcome-streak {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.1), rgba(251, 146, 60, 0.05));
    border-radius: var(--radius-xl);
    border: 2px solid var(--orange-500);
}

.streak-icon {
    font-size: 4rem;
    line-height: 1;
}

.streak-info {
    text-align: center;
}

.streak-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--orange-500);
    line-height: 1;
}

.streak-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* === Dashboard Sections === */
.dashboard-section {
    margin-bottom: var(--spacing-2xl);
}

.section-heading {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-lg);
}

/* === Continue Learning Cards === */
.continue-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.continue-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all 0.2s ease;
    position: relative;
}

.continue-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.continue-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.continue-card.in-progress .continue-badge {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.continue-card.recommended .continue-badge {
    background: var(--gray-200);
    color: var(--text-secondary);
}

.continue-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.continue-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.continue-progress {
    margin-bottom: var(--spacing-lg);
}

.continue-progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.continue-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-600), var(--purple-600));
    border-radius: var(--radius-md);
    transition: width 0.5s ease;
}

.continue-progress-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.continue-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.meta-item svg {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.continue-btn {
    display: block;
    width: 100%;
    padding: 0.875em;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s ease;
}

.continue-btn {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.continue-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.continue-btn.secondary {
    background: var(--gray-100);
    color: var(--text-secondary);
}

.continue-btn.secondary:hover {
    background: var(--gray-200);
}

/* === Quick Actions === */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.action-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-lg);
}

.action-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.action-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.action-icon svg {
    width: 32px;
    height: 32px;
}

.action-content {
    flex: 1;
}

.action-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.action-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* === Achievements === */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.achievement-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
}

.achievement-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.achievement-card.locked {
    opacity: 0.6;
    background: rgba(255, 255, 255, 0.7);
    filter: grayscale(0.5);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.achievement-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.achievement-description {
    font-size: 0.75rem;
    color: var(--gray-700);
}

/* === Responsive === */
@media (max-width: 768px) {
    .welcome-section {
        flex-direction: column;
        text-align: center;
    }

    .welcome-title {
        font-size: 2rem;
    }

    .continue-grid {
        grid-template-columns: 1fr;
    }

    .actions-grid {
        grid-template-columns: 1fr;
    }

    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .achievements-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   DATA VISUALIZATION ENHANCEMENTS
   ============================================ */

/* === Chart Containers === */
.chart-container {
    position: relative;
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.chart-container canvas {
    max-height: 400px;
}

/* === Section Header with Subheading === */
.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-subheading {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    font-weight: 400;
}

/* === Clickable Stat Cards === */
.stat-card.clickable {
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.stat-card.clickable::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(147, 51, 234, 0.02));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card.clickable:hover::before {
    opacity: 1;
}

.stat-card.clickable:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-colored);
    border-color: var(--primary-500);
}

.stat-card.clickable:active {
    transform: translateY(-2px);
}

/* === Chart Toggle Buttons === */
.chart-toggle-group {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--gray-100);
    padding: 4px;
    border-radius: var(--radius-md);
}

.chart-toggle-btn {
    padding: 0.5em 1em;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.813rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    gap: 6px;
}

.chart-toggle-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.08);
}

.chart-toggle-btn.active {
    background: white;
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.chart-toggle-btn svg {
    flex-shrink: 0;
}

/* === Achievement Progress Ring === */
.achievement-progress-ring {
    position: relative;
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
}

.achievement-progress-ring svg {
    transform: rotate(-90deg);
}

.achievement-progress-ring .progress-circle {
    transition: stroke-dashoffset 0.5s ease;
}

.achievement-progress-ring .achievement-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    filter: grayscale(0.8) opacity(0.6);
}

.achievement-card.locked .achievement-progress-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

/* === Export Button === */
.export-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.813rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.export-btn:hover {
    border-color: var(--primary-500);
    color: var(--primary-600);
    background: var(--primary-50);
    transform: translateY(-1px);
}

.export-btn:active {
    transform: translateY(0);
}

.export-btn svg {
    width: 16px;
    height: 16px;
}

/* === Drill-Down Panel (Modal/Overlay) === */
.drill-down-panel {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    animation: fadeIn 0.2s ease;
}

.drill-down-panel.active {
    display: flex;
}

.drill-down-content {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.drill-down-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.drill-down-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.drill-down-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--gray-100);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.drill-down-close:hover {
    background: var(--gray-200);
    color: var(--text-primary);
}

.drill-down-body {
    padding: var(--spacing-xl);
}

/* === Trend Chart Wrapper === */
.trend-chart-wrapper {
    background: linear-gradient(to bottom, var(--gray-50), white);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* === Additional Accent Colors for Charts === */
:root {
    --accent-purple: var(--purple-500);
    --accent-blue: var(--blue-500);
    --accent-green: var(--green-500);
    --accent-orange: var(--orange-500);
}

/* === Responsive Chart Adjustments === */
@media (max-width: 768px) {
    .chart-container {
        min-height: 250px;
        padding: var(--spacing-md);
    }

    .chart-container canvas {
        max-height: 300px;
    }

    .chart-toggle-group {
        flex-wrap: wrap;
    }

    .chart-toggle-btn {
        font-size: 0.75rem;
        padding: 6px 10px;
    }

    .drill-down-content {
        max-height: 90vh;
        margin: var(--spacing-md);
    }

    .section-header {
        text-align: center;
    }
}


/* ===================================
   SMARTEN Authentication Pages - Styles
   =================================== */

/* === Auth Body === */
.auth-body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* === Auth Header === */
.auth-header {
    padding: var(--spacing-lg) 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.auth-header .logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.auth-header .logo-title {
    color: white;
    background: none;
    -webkit-text-fill-color: white;
}

.auth-header .logo-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.auth-header .logo-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* === Auth Main === */
.auth-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: 1100px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 600px;
}

/* === Form Section === */
.auth-form-section {
    padding: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-form-wrapper {
    max-width: 400px;
    width: 100%;
    margin: 0 auto;
}

.auth-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.auth-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

/* === Form Elements === */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    background: white;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.form-select {
    cursor: pointer;
}

/* === Form Options === */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.form-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-600);
}

.forgot-link,
.inline-link {
    font-size: 0.875rem;
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
}

.forgot-link:hover,
.inline-link:hover {
    text-decoration: underline;
}

/* === Auth Buttons === */
.auth-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    border: none;
}

.auth-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    box-shadow: var(--shadow-md);
}

.auth-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* === Divider === */
.auth-divider {
    text-align: center;
    position: relative;
    margin: var(--spacing-lg) 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: calc(50% - 50px);
    height: 1px;
    background: var(--border-color);
}

.auth-divider::before {
    left: 0;
}

.auth-divider::after {
    right: 0;
}

.auth-divider span {
    background: white;
    padding: 0 var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
    position: relative;
}

/* === Social Buttons === */
.social-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.social-btn {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    background: white;
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.social-btn svg {
    width: 20px;
    height: 20px;
}

.social-btn:hover {
    border-color: var(--primary-400);
    background: var(--gray-50);
}

/* === Auth Footer === */
.auth-footer {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.auth-footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.auth-link {
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 600;
}

.auth-link:hover {
    text-decoration: underline;
}

/* === Verification Page === */
.verification-content {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.verification-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.verification-icon svg {
    width: 40px;
    height: 40px;
}

.verification-content .auth-title {
    margin-bottom: var(--spacing-md);
}

.verification-message {
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.verification-hint {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xl);
}

.verification-btn {
    display: inline-block;
    width: auto;
    min-width: 200px;
    text-decoration: none;
    text-align: center;
}

/* === Form Validation States === */
.form-group.success .form-input,
.form-group.success .form-select {
    border-color: var(--success-500);
}

.form-group.success .form-input:focus,
.form-group.success .form-select:focus {
    border-color: var(--success-500);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-group.error .form-input,
.form-group.error .form-select {
    border-color: var(--error-500);
}

.form-group.error .form-input:focus,
.form-group.error .form-select:focus {
    border-color: var(--error-500);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group.warning .form-input,
.form-group.warning .form-select {
    border-color: var(--warning-500);
}

.form-group.warning .form-input:focus,
.form-group.warning .form-select:focus {
    border-color: var(--warning-500);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

/* === Validation Icons === */
.form-group.success::after {
    content: '✓';
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--success-500);
    font-weight: bold;
    font-size: 1.25rem;
    pointer-events: none;
}

.form-group.error .form-input {
    padding-right: calc(var(--spacing-md) * 3);
}

/* === Error Messages === */
.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--error-500);
    margin-top: var(--spacing-xs);
    animation: slideDown 0.2s ease;
}

.error-message svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.success-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--success-500);
    margin-top: var(--spacing-xs);
    animation: slideDown 0.2s ease;
}

.success-message svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* === Loading States === */
.auth-btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.auth-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* === Accessibility Improvements === */
[aria-invalid="true"] {
    border-color: var(--error-500);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Screen reader announcements */
[role="alert"] {
    position: relative;
}


/* === Info Section === */
.auth-info-section {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    padding: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: white;
}

.auth-info-content {
    max-width: 400px;
    margin: 0 auto;
}

.info-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: white;
}

.info-text {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.info-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.feature-text h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.feature-text p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.5;
}

/* === Responsive === */
@media (max-width: 968px) {
    .auth-container {
        grid-template-columns: 1fr;
    }

    .auth-info-section {
        display: none;
    }

    .auth-form-wrapper {
        max-width: 100%;
    }
}

@media (max-width: 640px) {
    .auth-main {
        padding: var(--spacing-lg);
    }

    .auth-form-section {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .auth-title {
        font-size: 1.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .social-buttons {
        grid-template-columns: 1fr;
    }

    .form-options {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===================================
   Footer Styles
   =================================== */

.footer {
    background: transparent;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-xs);
}

.footer-description {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xs);
}

.footer-text {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
    margin: 0;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
}

/* Footer Responsive */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* ===================================
   PREMIUM ENHANCEMENTS & MICRO-ANIMATIONS
   Based on UX Analysis - Adult Professional Learners
   =================================== */

/* === Entrance Animations === */
@keyframes slideUpFade {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes streakPulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

/* Reduced motion support for accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* === Enhanced Streak Counter (High Motivation) === */
.welcome-streak {
    animation: scaleIn 0.5s var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.welcome-streak::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg,
            transparent 30%,
            rgba(255, 255, 255, 0.3) 50%,
            transparent 70%);
    animation: shimmer 3s infinite;
}

.streak-icon {
    animation: streakPulse 2s ease-in-out infinite;
    filter: drop-shadow(0 4px 8px rgba(249, 115, 22, 0.4));
}

.streak-number {
    animation: countUp 0.8s var(--transition-bounce);
    text-shadow: 0 2px 10px rgba(249, 115, 22, 0.3);
}

/* === Enhanced Stat Cards === */
.stat-card {
    animation: slideUpFade 0.6s ease-out backwards;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 1));
    position: relative;
    overflow: hidden;
}

.stat-card:nth-child(1) {
    animation-delay: 0.1s;
}

.stat-card:nth-child(2) {
    animation-delay: 0.2s;
}

.stat-card:nth-child(3) {
    animation-delay: 0.3s;
}

.stat-card:nth-child(4) {
    animation-delay: 0.4s;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-600), var(--purple-600));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card-icon {
    box-shadow: var(--shadow-colored);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover .stat-card-icon {
    transform: rotate(5deg) scale(1.05);
    box-shadow: var(--shadow-colored-lg);
}

.stat-card-value {
    background: linear-gradient(135deg, var(--text-primary), var(--primary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Enhanced Achievement Cards === */
.achievement-card.unlocked {
    animation: scaleIn 0.5s var(--transition-bounce);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(99, 102, 241, 0.05));
    box-shadow: var(--shadow-lg), 0 0 0 2px var(--primary-300);
}

.achievement-card.unlocked::before {
    content: '✨';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 1.5rem;
    animation: streakPulse 2s infinite;
}

.achievement-card.unlocked:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-2xl), 0 0 20px rgba(99, 102, 241, 0.2);
}

.achievement-card.locked {
    position: relative;
}

.achievement-card.locked::after {
    content: '🔒';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    opacity: 0.6;
}

.achievement-card.locked:hover {
    opacity: 0.7;
    filter: grayscale(0.7);
}

/* === Continue Learning Cards Premium Effects === */
.continue-card {
    animation: slideUpFade 0.6s ease-out;
    background: linear-gradient(135deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0.95));
}

.continue-card.in-progress {
    box-shadow: var(--shadow-lg), 0 0 0 2px var(--primary-300);
}

.continue-card.in-progress:hover {
    box-shadow: var(--shadow-2xl), 0 0 20px rgba(99, 102, 241, 0.25);
}

.continue-progress-fill {
    position: relative;
    overflow: hidden;
}

.continue-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    background: linear-gradient(90deg,
            transparent,
            transparent 30%,
            rgba(255, 255, 255, 0.4) 50%,
            transparent 70%,
            transparent);
    background-size: 200% 100%;
    animation: shimmer 4s infinite;
}

/* === Enhanced Action Cards === */
.action-card {
    animation: slideUpFade 0.6s ease-out;
    position: relative;
    overflow: hidden;
}

.action-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.action-card:hover::before {
    opacity: 1;
}

.action-icon svg {
    transition: transform var(--transition-base);
}

.action-card:hover .action-icon svg {
    transform: scale(1.1) rotate(5deg);
}

/* === Lesson Cards Enhanced === */
.lesson-card {
    animation: slideUpFade 0.5s ease-out backwards;
    position: relative;
    overflow: hidden;
}

.lesson-card:nth-child(1) {
    animation-delay: 0s;
}

.lesson-card:nth-child(2) {
    animation-delay: 0.1s;
}

.lesson-card:nth-child(3) {
    animation-delay: 0.2s;
}

.lesson-card:nth-child(4) {
    animation-delay: 0.3s;
}

.lesson-card:nth-child(5) {
    animation-delay: 0.4s;
}

.lesson-card:nth-child(6) {
    animation-delay: 0.5s;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-600), var(--purple-600));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.lesson-card:hover::before {
    transform: scaleX(1);
}

.progress-fill {
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    background: linear-gradient(90deg,
            transparent,
            transparent 30%,
            rgba(255, 255, 255, 0.5) 50%,
            transparent 70%,
            transparent);
    background-size: 200% 100%;
    animation: shimmer 4s infinite;
}

/* === Enhanced Buttons === */
.lesson-btn,
.continue-btn {
    position: relative;
    overflow: hidden;
}

.lesson-btn::before,
.continue-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.lesson-btn:hover::before,
.continue-btn:hover::before {
    width: 500%;
    height: 500%;
}

/* === Loading States === */
.loading-skeleton {
    background: linear-gradient(90deg,
            var(--gray-200) 25%,
            var(--gray-100) 50%,
            var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

/* === Focus States for Accessibility === */
.nav-btn:focus-visible,
.auth-link-btn:focus-visible,
.lesson-btn:focus-visible,
.continue-btn:focus-visible,
.filter-btn:focus-visible,
.action-card:focus-visible {
    outline: 3px solid var(--primary-400);
    outline-offset: var(--focus-ring-offset);
    box-shadow: var(--focus-ring);
}

/* === Skip to Content Link === */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-600);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    z-index: 1000;
    transition: top var(--transition-base);
}

.skip-to-content:focus {
    top: var(--spacing-lg);
}

/* === Enhanced Panel Component === */
.panel {
    animation: slideUpFade 0.5s ease-out;
}

.panel-header {
    background: linear-gradient(135deg, var(--gray-50), rgba(255, 255, 255, 0.95));
}

/* === Enhanced Form States === */
.text-editor:focus,
input:focus,
textarea:focus {
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
    background: white;
}

.option:focus-within {
    outline: 2px solid var(--primary-400);
    outline-offset: 2px;
}

.option.correct {
    animation: scaleIn 0.3s var(--transition-bounce);
}

.option.incorrect {
    animation: shake 0.5s;
}

/* === Mobile Touch Improvements === */
@media (max-width: 768px) {

    /* Larger touch targets */
    .nav-btn,
    .lesson-btn,
    .continue-btn,
    .filter-btn {
        min-height: 48px;
        min-width: 48px;
    }

    /* Better spacing on mobile */
    .stat-card,
    .achievement-card,
    .action-card {
        padding: var(--spacing-lg);
    }

    /* Reduced animations on mobile for performance */
    .stat-card,
    .achievement-card,
    .lesson-card,
    .action-card {
        animation-duration: 0.3s;
    }
}

/* === Print Styles === */
@media print {

    .header,
    .footer,
    .nav,
    .auth-buttons {
        display: none;
    }

    .main {
        padding: 0;
    }

    * {
        animation: none !important;
        transition: none !important;
        box-shadow: none !important;
    }
}

/* === Custom Chart Styles === */
.custom-chart-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

.chart-bar-item {
    display: grid;
    grid-template-columns: 200px 1fr 40px;
    align-items: center;
    gap: var(--spacing-xs);
}

.chart-bar-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

.chart-bar-icon {
    font-size: 1.25rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-bar-track {
    height: 32px;
    background: var(--gray-100);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.chart-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.chart-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 255, 255, 0.3) 50%,
            transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.chart-bar-fill.grammar {
    background: linear-gradient(90deg, #ef4444 0%, #dc2626 100%);
}

.chart-bar-fill.vocabulary {
    background: linear-gradient(90deg, #3b82f6 0%, #2563eb 100%);
}

.chart-bar-fill.syntax {
    background: linear-gradient(90deg, #f59e0b 0%, #d97706 100%);
}

.chart-bar-fill.spelling {
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
}

.chart-bar-fill.reading {
    background: linear-gradient(90deg, #6366f1 0%, #4f46e5 100%);
}

.chart-bar-value {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    text-align: right;
    min-width: 40px;
}

/* === Custom Line Chart Placeholder === */
.custom-line-chart {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
}

.line-chart-info {
    text-align: center;
    padding: var(--spacing-2xl);
}

.chart-placeholder-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.chart-placeholder-subtext {
    font-size: 0.875rem;
    color: var(--text-muted);
    max-width: 400px;
}

/* === Mobile Overrides (Moved for Specificity) === */
@media (max-width: 768px) {

    /* Mobile Filters */
    .filters-panel {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .filters-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .filters-row.divider {
        padding-top: var(--spacing-md);
    }

    .filter-group {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: nowrap !important;
        /* Force single line */
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
        scrollbar-width: none;
        -ms-overflow-style: none;

        box-sizing: border-box;
    }

    .filter-group::-webkit-scrollbar {
        display: none;
    }

    .filter-btn,
    .skill-filter-item {
        flex-shrink: 0;
        white-space: nowrap;
        padding: 0.5em 0.75em;
        font-size: 0.8125rem;
        justify-content: center;
        /* Center text in button */
    }

    .filter-group-label {
        width: auto;
        margin-right: var(--spacing-xs);
        margin-bottom: 0;
        flex-shrink: 0;
        align-self: center;
    }

    .sort-dropdown,
    .sort-dropdown select {
        width: 100%;
    }
}

/* ============================================
   TESTS FEATURE STYLES
   ============================================ */

/* === Tests Grid === */
.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

/* === Test Card === */
.test-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.test-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.test-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.test-card-icon svg {
    width: 28px;
    height: 28px;
}

.test-card-icon.grammar {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.test-card-icon.vocabulary {
    background: linear-gradient(135deg, #f97316, #ea580c);
    color: white;
}

.test-card-icon.syntax {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: white;
}

.test-card-icon.reading {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.test-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.test-card-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.test-card-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.test-meta-item {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--gray-100);
    padding: 0.25em 0.75em;
    border-radius: var(--radius-md);
    font-weight: 500;
}

.test-start-btn {
    margin-top: auto;
    padding: 0.875em 1.5em;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.test-start-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.test-card-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: auto;
}

.test-card-actions .test-start-btn {
    flex: 1;
    margin-top: 0;
}

.test-regenerate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25em;
    padding: 0.875em 1em;
    background: var(--gray-100);
    color: var(--primary-600);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.test-regenerate-btn svg {
    width: 16px;
    height: 16px;
}

.test-regenerate-btn:hover {
    background: var(--primary-50);
    border-color: var(--primary-400);
    transform: translateY(-1px);
}

.test-regenerate-btn.loading {
    opacity: 0.7;
    pointer-events: none;
}

.test-regenerate-btn.loading svg {
    animation: spin 1s linear infinite;
}

/* === Active Test Panel === */
.active-test-panel .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.test-header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.back-to-tests-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5em 1em;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.back-to-tests-btn:hover {
    background: var(--gray-200);
    color: var(--text-primary);
}

.back-to-tests-btn svg {
    width: 16px;
    height: 16px;
}

.test-header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.test-regenerate-header-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5em 1em;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-md);
    color: var(--primary-600);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.test-regenerate-header-btn:hover {
    background: var(--primary-100);
    border-color: var(--primary-300);
}

.test-regenerate-header-btn svg {
    width: 16px;
    height: 16px;
}

.test-regenerate-header-btn.loading {
    opacity: 0.7;
    pointer-events: none;
}

.test-regenerate-header-btn.loading svg {
    animation: spin 1s linear infinite;
}

.test-progress-indicator {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--gray-100);
    padding: 0.5em 1em;
    border-radius: var(--radius-md);
}

.test-progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
}

.test-progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* === Question Container === */
.question-container {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

/* === Multiple Choice Options === */
.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
}

.option-item:hover {
    border-color: var(--primary-400);
    background: var(--primary-50);
}

.option-item.selected {
    border-color: var(--primary-600);
    background: var(--primary-50);
}

.option-item.correct {
    border-color: var(--green-500);
    background: rgba(16, 185, 129, 0.1);
}

.option-item.incorrect {
    border-color: var(--error-500);
    background: rgba(239, 68, 68, 0.1);
}

.option-letter {
    width: 32px;
    height: 32px;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: var(--spacing-md);
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.option-item.selected .option-letter {
    background: var(--primary-600);
    color: white;
}

.option-item.correct .option-letter {
    background: var(--green-500);
    color: white;
}

.option-item.incorrect .option-letter {
    background: var(--error-500);
    color: white;
}

.option-text {
    font-size: 1rem;
    color: var(--text-primary);
}

/* === Fill in the Blank === */
.fill-blank-container {
    margin-top: var(--spacing-md);
}

.fill-blank-input {
    width: 100%;
    padding: var(--spacing-lg);
    font-size: 1.125rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    transition: all 0.2s ease;
}

.fill-blank-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* === Word Reorder === */
.word-reorder-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.word-bank {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
    min-height: 60px;
}

.word-chip {
    padding: 0.5em 1em;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--primary-600);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.word-chip:hover {
    background: var(--primary-100);
    transform: translateY(-1px);
}

.word-chip.used {
    opacity: 0.4;
    cursor: default;
}

.sentence-builder {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 2px solid var(--primary-400);
    min-height: 60px;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
}

.builder-placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.builder-word {
    padding: 0.5em 1em;
    background: var(--primary-600);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.builder-word:hover {
    background: var(--primary-500);
}

/* === Test Navigation === */
.test-navigation {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.test-nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.875em 2em;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.test-nav-btn svg {
    width: 18px;
    height: 18px;
}

.test-nav-btn.secondary {
    background: var(--gray-100);
    color: var(--text-secondary);
}

.test-nav-btn.secondary:hover:not(:disabled) {
    background: var(--gray-200);
}

.test-nav-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.test-nav-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.test-nav-btn.submit {
    background: linear-gradient(135deg, var(--green-500), var(--green-600));
    color: white;
}

.test-nav-btn.submit:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.test-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === Test Results === */
.results-summary {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--gray-50), var(--primary-50));
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
}

.results-score-circle {
    position: relative;
    width: 140px;
    height: 140px;
    flex-shrink: 0;
}

.score-circle-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-circle-bg {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 3;
}

.score-circle-fill {
    fill: none;
    stroke: var(--primary-600);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dasharray 1s ease;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.score-percent {
    font-size: 1rem;
    color: var(--text-secondary);
}

.results-details h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.results-details p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.results-breakdown {
    display: flex;
    gap: var(--spacing-xl);
}

.breakdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.breakdown-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.75rem;
}

.breakdown-item.correct .breakdown-icon {
    background: rgba(16, 185, 129, 0.2);
    color: var(--green-600);
}

.breakdown-item.incorrect .breakdown-icon {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-500);
}

.breakdown-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.breakdown-value {
    font-weight: 600;
    color: var(--text-primary);
}

/* === Review Section === */
.review-section {
    margin-bottom: var(--spacing-xl);
}

.review-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.review-item {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
}

.review-item.correct {
    border-left-color: var(--green-500);
}

.review-item.incorrect {
    border-left-color: var(--error-500);
}

.review-question {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.review-answer {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.review-answer strong {
    color: var(--text-primary);
}

/* === Review Item Actions (Explain/Examples) === */
.review-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.review-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    color: var(--primary-600);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s ease;
}

.review-action-btn:hover {
    background: var(--gray-100);
}

.review-action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.review-action-btn:disabled:hover {
    background: none;
}

.review-action-btn .btn-normal-state {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.review-action-btn .btn-loading-state {
    display: none;
    align-items: center;
    gap: 6px;
}

.review-action-btn.is-loading .btn-normal-state {
    display: none;
}

.review-action-btn.is-loading .btn-loading-state {
    display: inline-flex;
}

.review-action-btn svg {
    flex-shrink: 0;
}

.review-action-response {
    margin-top: var(--spacing-md);
}

.review-explanation-response {
    border-left: 3px solid var(--success-500);
}

.review-examples-response {
    border-left: 3px solid var(--primary-500);
}

@media (max-width: 768px) {
    .review-actions {
        flex-direction: column;
    }
}

/* === Results Actions === */
.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.test-action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.875em 2em;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.test-action-btn svg {
    width: 18px;
    height: 18px;
}

.test-action-btn.secondary {
    background: var(--gray-100);
    color: var(--text-secondary);
}

.test-action-btn.secondary:hover {
    background: var(--gray-200);
}

.test-action-btn.primary {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
}

.test-action-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.test-action-btn .spinner {
    width: 18px;
    height: 18px;
    animation: spin 1s linear infinite;
}

.test-action-btn:disabled {
    opacity: 0.7;
    cursor: wait;
}

/* === Question Source Link === */
.question-source {
    text-align: right;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.question-source a {
    color: var(--text-muted);
    text-decoration: none;
}

.question-source a:hover {
    text-decoration: underline;
}

/* === Reading Passage === */
.reading-passage {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-500);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    font-size: 1rem;
    color: var(--text-primary);
}

.reading-question {
    font-weight: 600;
    color: var(--text-primary);
}

/* === Tests Responsive === */
@media (max-width: 768px) {
    .tests-grid {
        grid-template-columns: 1fr;
    }

    .results-summary {
        flex-direction: column;
        text-align: center;
    }

    .results-breakdown {
        justify-content: center;
    }

    .test-navigation,
    .results-actions {
        flex-direction: column;
    }

    .test-nav-btn,
    .test-action-btn {
        width: 100%;
        justify-content: center;
    }

    .test-header-left {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}
/* ===================================
   Additional Styles for Django Auth
   =================================== */

/* === Messages Container === */
.messages-container {
    margin-bottom: var(--spacing-lg);
}

.message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.message-success {
    background-color: #d1fae5;
    border: 1px solid #10b981;
    color: #065f46;
}

.message-error {
    background-color: #fee2e2;
    border: 1px solid #ef4444;
    color: #991b1b;
}

.message-warning {
    background-color: #fef3c7;
    border: 1px solid #f59e0b;
    color: #92400e;
}

.message-info {
    background-color: #dbeafe;
    border: 1px solid #3b82f6;
    color: #1e40af;
}

/* === Legal Modal Styles === */
@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.legal-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    animation: modalFadeIn 0.2s ease-out;
}

.legal-modal {
    background: white;
    border-radius: 16px;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    animation: modalSlideUp 0.3s ease-out;
}

.legal-modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.legal-modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #111827;
}

.legal-modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    color: #6b7280;
    display: flex;
    align-items: center;
    justify-content: center;
}

.legal-modal-close:hover {
    background: #f3f4f6;
    color: #111827;
}

.legal-modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    color: #374151;
    line-height: 1.6;
}

.legal-modal-body h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #111827;
    margin: 1.25rem 0 0.5rem 0;
}

.legal-modal-body h3:first-child {
    margin-top: 0;
}

.legal-modal-body p {
    margin: 0 0 0.75rem 0;
    font-size: 0.875rem;
}

.legal-modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: flex-end;
}

.legal-modal-btn {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
}

.legal-modal-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* === Logo as Link === */
a.logo {
    text-decoration: none;
}

a.logo:hover .logo-icon {
    transform: scale(1.05);
}

a.logo .logo-icon {
    transition: transform 0.2s ease;
}

/* ===================================
   Landing Page Styles
   =================================== */

.landing-body {
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.landing-main {
    flex: 1;
}

/* Hero Section */
.landing-body .hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 6rem 0 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.landing-body .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-size: 0.875rem;
    color: white;
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: heroPulse 2s infinite;
}

@keyframes heroPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-lg);
    line-height: 1.15;
}

.hero-title-highlight {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    font-family: var(--font-family);
}

.hero-btn.primary {
    background: white;
    color: var(--primary-600);
}

.hero-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.hero-btn.secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.hero-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-btn svg {
    width: 20px;
    height: 20px;
}

/* Features Section */
.landing-body .features {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

/* Landing page section headers - override app styles */
.landing-body .section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
}

.landing-body .section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-600);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.landing-body .section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: 0;
    border-bottom: none;
    letter-spacing: normal;
}

.landing-body .section-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-400);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.landing-body .feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.landing-body .feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-icon.purple {
    background: rgba(139, 92, 246, 0.15);
    color: var(--purple-600);
}

.feature-icon.blue {
    background: rgba(59, 130, 246, 0.15);
    color: var(--blue-600);
}

.feature-icon.green {
    background: rgba(16, 185, 129, 0.15);
    color: var(--green-600);
}

.feature-icon.orange {
    background: rgba(245, 158, 11, 0.15);
    color: var(--orange-600);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* How It Works Section */
.landing-body .how-it-works {
    padding: 5rem 0;
    background: var(--bg-primary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    position: relative;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.step-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.step-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Levels Section */
.landing-body .levels {
    padding: 5rem 0;
    background: var(--bg-secondary);
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.level-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-base);
}

.level-card:hover {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-lg);
}

.level-badge {
    display: inline-block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-600);
    background: var(--primary-50);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.level-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.level-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* CTA Section */
.landing-body .cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
}

.cta-text {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer for landing page */
.landing-body .footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    margin-top: 0;
}

.landing-body .cta {
    padding-bottom: var(--spacing-2xl);
}

/* Landing page responsive */
@media (max-width: 768px) {
    .landing-body .hero {
        padding: 4rem 0 3rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-buttons,
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .landing-body .features,
    .landing-body .how-it-works,
    .landing-body .levels,
    .landing-body .cta {
        padding: 3rem 0;
    }

    .landing-body .section-title {
        font-size: 1.5rem;
    }

    .cta-title {
        font-size: 1.5rem;
    }
}

/* ===================================
   Writing Task Generator Component
   =================================== */

.task-generator {
    margin-bottom: var(--spacing-sm);
}

.task-generator.is-loading {
    pointer-events: none;
}

/* Compact Generator Bar */
.task-generator-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}

.task-generator-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.task-generator-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.task-generator-label svg {
    width: 16px;
    height: 16px;
    color: var(--primary-500);
}

.task-generator-select {
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: white;
    color: var(--text-primary);
    font-size: 0.8rem;
    cursor: pointer;
    min-width: 90px;
}

.task-generator-select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.task-generator-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.4rem 0.75rem;
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast), opacity var(--transition-fast);
    white-space: nowrap;
}

.task-generator-btn:hover:not(:disabled) {
    background: var(--primary-500);
}

.task-generator-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.task-generator-btn.loading {
    background: var(--gray-400);
}

/* Button Spinner - hidden by default, shown when button has .loading class */
.btn-spinner {
    display: none;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.task-generator-btn.loading .btn-spinner {
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Inline Error */
.task-error-inline {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(239, 68, 68, 0.08);
    border-radius: var(--radius-sm);
    color: var(--error-500);
    font-size: 0.8rem;
}

.task-error-inline svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.task-error-inline span {
    flex: 1;
}

.task-error-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    padding: 0;
    background: none;
    border: none;
    color: var(--error-500);
    cursor: pointer;
    opacity: 0.7;
}

.task-error-close:hover {
    opacity: 1;
}

.task-error-close svg {
    width: 14px;
    height: 14px;
}

/* Task Card - Compact Display */
.task-card {
    margin-top: var(--spacing-sm);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.04) 0%, rgba(139, 92, 246, 0.04) 100%);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.task-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(99, 102, 241, 0.08);
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.task-card-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.task-level-badge {
    display: inline-block;
    padding: 0.15em 0.5em;
    background: var(--green-600, #16a34a);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.task-type-badge {
    display: inline-block;
    padding: 0.15em 0.5em;
    background: var(--primary-600);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.task-topic-badge {
    display: inline-block;
    padding: 0.15em 0.5em;
    background: var(--orange-600, #ea580c);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.task-word-badge {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.task-card-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.task-card-close:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

.task-card-close svg {
    width: 16px;
    height: 16px;
}

.task-card-body {
    padding: var(--spacing-sm);
}

.task-card-context {
    margin: 0 0 var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.task-card-instruction {
    margin: 0 0 var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.task-card-instruction strong {
    font-weight: 500;
}

.task-card-details {
    margin-top: var(--spacing-xs);
}

.task-card-details summary {
    font-size: 0.8rem;
    color: var(--primary-600);
    cursor: pointer;
    user-select: none;
    padding: var(--spacing-xs) 0;
}

.task-card-details summary:hover {
    color: var(--primary-500);
}

.task-card-details[open] summary {
    margin-bottom: var(--spacing-xs);
}

.task-card-requirements {
    margin: 0;
    padding-left: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.task-card-requirements li {
    margin-bottom: 2px;
}

/* Responsive */
@media (max-width: 600px) {
    .task-generator-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .task-generator-left {
        flex-direction: column;
        align-items: stretch;
    }

    .task-generator-select {
        width: 100%;
    }

    .task-generator-btn {
        width: 100%;
        justify-content: center;
    }
}

/* === Text Analyzer Styles === */
.text-analyzer {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Analyzer Loading State */
.analyzer-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    gap: var(--spacing-md);
    color: var(--text-secondary);
}

.analyzer-loading .loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Analyzer Error Message */
.analyzer-error {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-lg);
    color: var(--error-500);
    font-size: 0.875rem;
}

.analyzer-error svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.analyzer-error span {
    flex: 1;
}

.analyzer-error-close {
    background: none;
    border: none;
    padding: var(--spacing-xs);
    cursor: pointer;
    color: var(--error-500);
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.analyzer-error-close:hover {
    opacity: 1;
}

.analyzer-error-close svg {
    width: 16px;
    height: 16px;
}

/* Analysis Results */
.analysis-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Analysis Summary */
.analysis-summary {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.summary-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.summary-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.summary-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-500);
}

.summary-icon.info {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-500);
}

.summary-icon svg {
    width: 24px;
    height: 24px;
}

.summary-text h3 {
    margin: 0 0 var(--spacing-xs);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.summary-text p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Summary Stats Badges */
.summary-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.stat-badge .stat-count {
    font-weight: 700;
}

.stat-badge.grammar {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-500);
}

.stat-badge.vocabulary {
    background: rgba(249, 115, 22, 0.1);
    color: var(--orange-500);
}

.stat-badge.syntax {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-600);
}

.stat-badge.spelling {
    background: rgba(168, 85, 247, 0.1);
    color: var(--purple-500);
}

/* Intelligibility Indicator */
.intelligibility-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.intelligibility-label {
    color: var(--text-secondary);
}

.intelligibility-value {
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
}

.intelligibility-value.clear {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-500);
}

.intelligibility-value.mostly_clear {
    background: rgba(245, 158, 11, 0.1);
    color: var(--amber-500);
}

.intelligibility-value.unclear {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-500);
}

/* Error Items in Analyzer */
.analysis-results .error-item {
    border-left: 3px solid transparent;
}

.analysis-results .error-item.blocking {
    border-left-color: var(--error-500);
}

.analysis-results .error-item.non_blocking {
    border-left-color: var(--amber-500);
}

.analysis-results .error-item.acceptable_b1plus,
.analysis-results .error-item.acceptable_b2 {
    border-left-color: var(--success-500);
}

.error-severity {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.error-severity.blocking {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-500);
}

.error-severity.non_blocking {
    background: rgba(245, 158, 11, 0.1);
    color: var(--amber-500);
}

.error-severity.acceptable_b1plus,
.error-severity.acceptable_b2 {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-500);
}

.error-arrow {
    width: 16px;
    height: 16px;
    margin: 0 var(--spacing-sm);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* Corrected Sentences Section */
.corrected-sentences-section {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.corrected-sentences-section summary {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-50);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    transition: background 0.2s ease;
}

.corrected-sentences-section summary:hover {
    background: var(--gray-100);
}

.corrected-sentences-section summary svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.corrected-sentences-section[open] summary svg {
    transform: rotate(90deg);
}

.corrected-sentences {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sentence-pair {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--gray-50);
}

.sentence-pair.has-errors {
    background: rgba(239, 68, 68, 0.03);
    border-left: 3px solid var(--error-300);
}

.sentence-original,
.sentence-corrected {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.sentence-corrected {
    margin-bottom: 0;
}

.sentence-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    min-width: 70px;
}

.sentence-original .sentence-text {
    color: var(--error-500);
    text-decoration: line-through;
}

.sentence-corrected .sentence-text {
    color: var(--success-500);
}

.sentence-correct {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--success-500);
}

.sentence-correct svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Analysis Actions */
.analysis-actions {
    display: flex;
    justify-content: center;
    padding-top: var(--spacing-md);
}

.analysis-clear-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.analysis-clear-btn:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    color: var(--text-primary);
}

.analysis-clear-btn svg {
    width: 16px;
    height: 16px;
}

/* Button Loading State */
.control-btn.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.9;
}

.control-btn.loading .btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.control-btn:not(.primary).loading .btn-spinner {
    border-color: rgba(99, 102, 241, 0.3);
    border-top-color: var(--primary-500);
}

/* Responsive Analyzer */
@media (max-width: 768px) {
    .summary-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .summary-stats {
        flex-direction: column;
    }

    .sentence-original,
    .sentence-corrected {
        flex-direction: column;
    }

    .sentence-label {
        min-width: auto;
    }
}