/* ============================================================================
   THINKRIGHT - MAIN STYLESHEET
   
   This stylesheet uses CSS Custom Properties (variables) for theming,
   making it easy to support light and dark modes.
   
   Structure:
   1. CSS Variables (Colors, Spacing, Typography)
   2. Root & Theme Declarations
   3. Base Styles (HTML, Body, Typography)
   4. Layout Components (Container, Header, Footer)
   5. Landing Page Styles
   6. Test Page Styles
   7. Modal & Results
   8. Responsive Design (Mobile, Tablet, Desktop)
   9. Animations
   
   ========================================================================== */

/* ============================================================================
   1. CSS VARIABLES - THEME COLORS & SPACING
   
   These variables control the entire app's appearance. Change them in
   the :root selector for light mode, and in [data-theme="dark"] for dark mode.
   ========================================================================== */

:root {
    /* Primary Colors - Light Mode */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f0f2f5;
    --color-text-primary: #000000;
    --color-text-secondary: #555555;
    --color-border: #cccccc;
    --color-accent: #007bff;
    --color-accent-hover: #0056b3;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;

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

    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;

    /* Z-index Scale */
    --z-dropdown: 100;
    --z-modal: 1000;
}

/* ============================================================================
   2. DARK MODE THEME VARIABLES
   
   When [data-theme="dark"] is applied to the html element,
   these colors override the light mode defaults.
   ========================================================================== */

[data-theme="dark"] {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #2a2a2a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-border: #404040;
    --color-accent: #4a9eff;
    --color-accent-hover: #2a7fd4;
    --color-success: #4ade80;
    --color-danger: #f87171;
    --color-warning: #facc15;
}

/* ============================================================================
   3. BASE STYLES
   
   HTML, body, and global typography reset.
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-normal),
                color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius-md);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================================
   4. LAYOUT COMPONENTS - CONTAINER, HEADER, FOOTER
   ========================================================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xxl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.header-content {
    flex: 1;
}

.logo {
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* Theme toggle button - common styling */
.theme-toggle {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
}

.theme-toggle:hover {
    background: var(--color-border);
    transform: scale(1.05);
}

.theme-toggle-small {
    width: 40px;
    height: 40px;
    font-size: var(--font-size-base);
}

.footer {
    margin-top: auto;
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-links,
.auth-footer-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.footer-links a,
.auth-footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.footer-links a:hover,
.auth-footer-links a:hover {
    color: var(--color-accent);
    background: var(--color-bg-secondary);
    transform: scale(1.05);
}

.auth-footer {
    text-align: center;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.auth-footer p {
    margin: 0 0 var(--spacing-md) 0;
}

/* ============================================================================
   5. LANDING PAGE STYLES
   
   Styles for the subject selection and welcome screens.
   ========================================================================== */

.landing-page {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.welcome-section {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    width: 100%;
}

.welcome-section h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.welcome-section p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Subject selection section */
.subjects-section {
    margin-bottom: var(--spacing-xxl);
}

.subjects-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
}

/* Subject card - button styling */
.subject-card {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    min-height: 200px;
    justify-content: center;
}

.subject-card:hover {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: white;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.subject-card:hover p {
    color: rgba(255, 255, 255, 0.9);
}

.subject-icon {
    font-size: 3rem;
    transition: transform var(--transition-normal);
}

.subject-card:hover .subject-icon {
    transform: scale(1.2) rotate(5deg);
}

.subject-card h3 {
    margin: 0;
    font-size: var(--font-size-lg);
}

.subject-card p {
    margin: 0;
    font-size: var(--font-size-sm);
}

/* Info section - how it works */
.info-section {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--color-accent);
}

.info-section h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.info-section ul {
    list-style: none;
    padding: 0;
}

.info-section li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-secondary);
}

.info-section li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

/* ============================================================================
   6. TEST PAGE STYLES
   
   Styles for the test interface including timer, questions, and navigation.
   ========================================================================== */

.test-page {
    background-color: var(--color-bg-primary);
}

.test-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Test page header */
.test-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.test-info {
    flex: 1;
    min-width: 200px;
}

.test-subject {
    margin: 0;
    font-size: var(--font-size-xl);
    color: var(--color-accent);
}

.test-progress {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

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

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

.timer {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    font-family: 'Courier New', monospace;
    background: var(--color-bg-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border: 2px solid var(--color-accent);
    min-width: 100px;
}

.timer-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
    margin-bottom: 0;
}

.timer.warning {
    color: var(--color-warning);
    border-color: var(--color-warning);
}

.timer.danger {
    color: var(--color-danger);
    border-color: var(--color-danger);
    animation: pulse 1s infinite;
}

/* Test content area */
.test-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Question section */
.question-section {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.question-container {
    margin-bottom: var(--spacing-xl);
}

.question-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-text-primary);
    word-wrap: break-word;
    white-space: pre-wrap;
    margin: 0;
    animation: fadeIn 0.4s ease-out;
}

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

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

.option-button {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.option-button:hover:not(.selected) {
    border-color: var(--color-accent);
    background: var(--color-bg-secondary);
    transform: translateX(4px);
}

.option-button.selected {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.option-letter {
    font-weight: var(--font-weight-bold);
    min-width: 24px;
    display: flex;
    align-items: center;
}

.option-text {
    flex: 1;
    line-height: 1.5;
}

/* Skip warning message */
.skip-warning {
    background: var(--color-warning);
    color: #000;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-md);
    border-left: 4px solid #ff9800;
    animation: slideInUp 0.3s ease-out;
}

/* Navigation section */
.navigation-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
}

.nav-button {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    cursor: pointer;
    flex: 1;
    max-width: 150px;
}

.nav-button:hover:not(:disabled) {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.navigation-info {
    flex: 1;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Submit section */
.submit-section {
    text-align: center;
    padding: var(--spacing-lg);
}

.submit-button {
    background: var(--color-success);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xxl);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    min-width: 200px;
}

.submit-button:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-button:active {
    transform: translateY(0);
}

/* ============================================================================
   7. MODAL & RESULTS STYLES
   
   Modal for displaying test results.
   ========================================================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--color-bg-primary);
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: slideInUp 0.4s ease-out;
}

.results-title {
    text-align: center;
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    color: var(--color-accent);
}

.results-summary {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-score {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.results-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.result-item {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    border: 2px solid var(--color-border);
}

.result-correct {
    background: rgba(40, 167, 69, 0.1);
    border-color: var(--color-success);
}

.result-wrong {
    background: rgba(220, 53, 69, 0.1);
    border-color: var(--color-danger);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.result-value {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0;
}

.result-correct .result-value {
    color: var(--color-success);
}

.result-wrong .result-value {
    color: var(--color-danger);
}

/* Results action buttons */
.results-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.action-button {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.retake-btn {
    background: var(--color-accent);
    color: white;
}

.retake-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

.review-btn {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.review-btn:hover {
    background: var(--color-accent);
    color: white;
}

.home-btn {
    background: var(--color-text-secondary);
    color: white;
}

.home-btn:hover {
    background: var(--color-text-primary);
}

/* ============================================================================
   REVIEW ANSWERS MODAL STYLES
   ========================================================================== */

.review-modal-content {
    max-width: 800px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.review-header h2 {
    margin: 0;
    color: var(--color-accent);
    font-size: var(--font-size-xl);
}

.review-close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.review-close-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-md);
}

.review-body {
    flex: 1;
    overflow-y: auto;
    margin-bottom: var(--spacing-lg);
}

.review-item {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-left: 5px solid var(--color-warning);
    background: var(--color-bg-secondary);
}

.review-item.correct {
    border-left-color: var(--color-success);
    background: rgba(40, 167, 69, 0.05);
}

.review-item.incorrect {
    border-left-color: var(--color-danger);
    background: rgba(220, 53, 69, 0.05);
}

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

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

.review-option {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    transition: all var(--transition-normal);
}

.option-header {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.review-option .option-label {
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-sm);
    color: var(--color-text-primary);
}

.review-option .option-text {
    color: var(--color-text-secondary);
}

.review-option.correct-answer {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.1);
}

.review-option.correct-answer .option-label {
    color: var(--color-success);
}

.review-option.correct-answer .option-header {
    color: var(--color-success);
}

.review-option.user-incorrect {
    border-color: var(--color-danger);
    background: rgba(220, 53, 69, 0.1);
}

.review-option.user-incorrect .option-label {
    color: var(--color-danger);
}

.review-option.user-incorrect .option-header {
    color: var(--color-danger);
}

.review-result {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-weight: var(--font-weight-medium);
    margin-top: var(--spacing-md);
}

.review-item.correct .review-result {
    color: var(--color-success);
    background: rgba(40, 167, 69, 0.15);
}

.review-item.incorrect .review-result {
    color: var(--color-danger);
    background: rgba(220, 53, 69, 0.15);
}

.review-explanation {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--color-accent);
}

.explanation-header {
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.explanation-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-sm);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.review-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
}

#reviewReturnBtn {
    background: var(--color-accent);
    color: white;
}

#reviewReturnBtn:hover {
    background: var(--color-accent-hover);
}

/* ============================================================================
   8. RESPONSIVE DESIGN
   
   Mobile-first approach. Styles adapt for tablets and larger screens.
   ========================================================================== */

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

    .header {
        flex-direction: row;
        gap: var(--spacing-md);
        text-align: left;
        margin-bottom: var(--spacing-lg);
        flex-wrap: wrap;
        position: relative;
    }

    .header-content {
        order: 1;
        flex: 1;
        min-width: 200px;
    }

    .header-controls {
        order: 2;
        width: auto;
        flex: 0 1 auto;
        gap: var(--spacing-sm);
    }

    .pricing-button {
        display: none !important;
        visibility: hidden !important;
    }

    .logo {
        font-size: var(--font-size-xl);
    }

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

    .test-header {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .test-controls {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-md);
    }

    .timer-section {
        width: 100%;
    }

    .timer {
        width: 100%;
    }

    .navigation-section {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-button {
        max-width: 100%;
    }

    .question-text {
        font-size: var(--font-size-base);
    }

    .option-button {
        padding: var(--spacing-md);
    }

    .test-content {
        gap: var(--spacing-md);
    }

    .question-section {
        padding: var(--spacing-lg);
    }

    .modal-content {
        padding: var(--spacing-lg);
        width: 95%;
    }

    /* Pricing Modal Mobile Adjustments */
    .pricing-modal {
        padding: 0.5rem;
    }

    .pricing-modal-content {
        max-height: 98vh;
        width: 100%;
        border-radius: 8px;
        margin: 0;
    }

    .pricing-header {
        padding: 0.75rem 0.5rem;
        border-radius: 8px 8px 0 0;
    }

    .pricing-header h2 {
        font-size: 1rem;
        margin: 0;
    }

    .pricing-close-btn {
        width: 2rem;
        height: 2rem;
        font-size: 1.5rem;
    }

    .pricing-body {
        padding: 0.75rem 0.5rem;
    }

    .pricing-intro {
        font-size: 0.8rem;
        margin-bottom: 0.75rem;
        line-height: 1.3;
    }

    .pricing-plans {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .pricing-card {
        padding: 0.75rem;
        width: 100%;
        box-sizing: border-box;
    }

    .pricing-badge {
        top: -10px;
        padding: 0.3rem 0.8rem;
        font-size: 0.75rem;
    }

    .pricing-card h3 {
        font-size: 1rem;
        margin-top: 0.2rem;
        margin-bottom: 0.3rem;
    }

    .pricing-price {
        font-size: 1.4rem;
        margin: 0.3rem 0 0.1rem 0;
    }

    .per-period {
        font-size: 0.7rem;
        margin-left: 0.3rem;
    }

    .plan-description {
        font-size: 0.8rem;
        margin: 0.2rem 0 0.6rem 0;
    }

    .pricing-benefits {
        margin: 0.6rem 0 0.8rem 0;
        text-align: left;
    }

    .pricing-benefits li {
        padding: 0.25rem 0;
        font-size: 0.8rem;
    }

    .pricing-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .pricing-comparison {
        margin-top: 0.75rem;
        padding-top: 0.75rem;
    }

    .pricing-comparison h3 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }

    .pricing-table {
        font-size: 0.65rem;
        width: 100%;
    }

    .pricing-table thead {
        background: var(--color-accent);
        color: white;
    }

    .pricing-table th {
        padding: 0.3rem 0.2rem;
        font-size: 0.65rem;
        line-height: 1.2;
        text-align: left;
        border-right: 1px solid var(--color-border);
    }

    .pricing-table th:last-child {
        border-right: none;
    }

    .pricing-table td {
        padding: 0.3rem 0.2rem;
        font-size: 0.65rem;
        border-bottom: 1px solid var(--color-border);
        border-right: 1px solid var(--color-border);
        line-height: 1.2;
    }

    .pricing-table td:last-child {
        border-right: none;
    }

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

    .pricing-footer {
        padding: 0.5rem;
        border-radius: 0 0 8px 8px;
    }

    .pricing-note {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: var(--font-size-lg);
    }

    .welcome-section h2 {
        font-size: var(--font-size-lg);
    }

    .welcome-section p {
        font-size: var(--font-size-base);
    }

    .timer {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md);
        min-width: auto;
    }

    .question-text {
        font-size: var(--font-size-base);
        line-height: 1.6;
    }

    .subject-card {
        min-height: 150px;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
    }

    .subject-icon {
        font-size: 2.5rem;
    }

    .submit-button {
        min-width: 100%;
    }
}

/* ============================================================================
   9. ANIMATIONS
   
   Smooth, professional animations using CSS keyframes.
   ========================================================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

/* ============================================================================
   UTILITY CLASSES
   ========================================================================== */

.hidden {
    display: none !important;
}

.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;
}

/* ============================================================================
   AUTHENTICATION PAGES (Login & Signup)
   
   Styles for login.html and signup.html pages.
   ========================================================================== */

.auth-page {
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    min-height: 100vh;
}

.auth-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 100vh;
    overflow: hidden;
}

/* Auth branding side (left) */
.auth-branding {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: white;
    padding: var(--spacing-xxl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--spacing-xl);
}

.auth-logo {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin: 0;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.auth-tagline {
    font-size: var(--font-size-lg);
    margin: 0;
    opacity: 0.9;
    color: white;
}

.auth-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: white;
    font-size: var(--font-size-base);
}

.feature-icon {
    background: rgba(255, 255, 255, 0.2);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Auth form side (right) */
.auth-form-container {
    background: var(--color-bg-primary);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow-y: auto;
}

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

.auth-form-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.auth-form-header h2 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-text-primary);
}

.auth-form-header p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Form styling */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

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

.form-label {
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.form-input {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-input::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.7;
}

/* Password visibility toggle inside form-group */
.form-group {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.password-toggle:focus {
    outline: 2px solid var(--color-accent);
    border-radius: 6px;
}

.form-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

.form-hint.valid {
    color: var(--color-success);
}

.form-hint.invalid {
    color: var(--color-danger);
}

/* Auth buttons */
.auth-button {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-accent);
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-base);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: none;
    min-height: 44px;
}

.auth-button:hover:not(:disabled) {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.auth-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Forgot Password Button */
.forgot-password-link {
    text-align: center;
    margin-top: var(--spacing-md);
}

.text-button {
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    font-size: inherit;
    text-decoration: none;
    padding: 0;
    transition: color 0.3s ease;
}

.text-button:hover {
    color: var(--color-primary-dark, #0056b3);
    text-decoration: underline;
}

.text-button:active {
    opacity: 0.8;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

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

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

.modal-header h2 {
    margin: 0;
    font-size: var(--font-size-xl);
    color: var(--color-text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.modal-overlay.show {
    display: block;
}

.auth-modal {
    background: white;
}

.form-help-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: var(--spacing-sm) 0;
}

/* Error & Success messages */
.auth-error {
    background: var(--color-danger);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.auth-success {
    background: var(--color-success);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Divider */
.auth-divider {
    text-align: center;
    margin: var(--spacing-lg) 0;
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
    z-index: 1;
}

.auth-divider span {
    position: relative;
    background: var(--color-bg-primary);
    padding: 0 var(--spacing-md);
    z-index: 2;
}

/* Auth links */
.auth-link-text {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

.auth-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-normal);
}

.auth-link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Theme toggle on auth page */
.theme-toggle-auth {
    margin-top: var(--spacing-xl);
    width: 100%;
}

/* Loading spinner */
.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;
}

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

/* Header controls for auth buttons */
.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

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

.user-email {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.header-button {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
}

.header-button:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* Dashboard link in header */
.header-link {
    color: white;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
    background: var(--color-accent);
}

.header-link:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

.logout-button {
    background: var(--color-danger);
}

.logout-button:hover {
    background: #c82333;
}

/* ============================================================================
   HERO AND ABOUT SECTIONS FOR AUTH PAGES
   ========================================================================== */

.auth-hero {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: white;
    padding: var(--spacing-xxl) var(--spacing-xl);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.auth-hero h1 {
    font-size: 2.5rem;
    margin: 0 0 var(--spacing-md) 0;
    font-weight: var(--font-weight-bold);
}

.auth-hero p {
    font-size: var(--font-size-lg);
    margin: 0;
    opacity: 0.95;
}

/* About section */
.auth-about {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xxl) var(--spacing-xl);
    text-align: center;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
}

.auth-about h2 {
    font-size: 2rem;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-text-primary);
}

.auth-about p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: 0 0 var(--spacing-lg) 0;
}

.auth-about p:last-child {
    margin: 0;
}

/* Footer for auth pages */
.auth-footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
}

.auth-footer p {
    margin: 0 0 var(--spacing-md) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.contact-button {
    display: inline-block;
    background: linear-gradient(135deg, #25D366 0%, #20BA58 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
}

.contact-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3);
}

/* Footer content wrapper for index page */
.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

/* ============================================================================
   Responsive Design for Auth Pages
   ========================================================================== */

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

    .auth-branding {
        display: none;
    }

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

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

    .theme-toggle-auth {
        margin-top: var(--spacing-lg);
    }
}

/* ============================================================================
   DASHBOARD PAGE STYLES
   
   Styles for the user dashboard displaying analytics and performance data.
   ========================================================================== */

.dashboard-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

/* Dashboard sections */
.dashboard-section {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
}

/* Overview Cards */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.overview-card {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

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

.overview-card-blue {
    border-left: 4px solid #007bff;
}

.overview-card-purple {
    border-left: 4px solid #9b59b6;
}

.overview-card-green {
    border-left: 4px solid #27ae60;
}

.overview-card-orange {
    border-left: 4px solid #f39c12;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.card-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

/* Subject Cards */
.subject-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.subject-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.subject-card:hover {
    box-shadow: var(--shadow-md);
}

.subject-card.empty {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-md);
}

.subject-title {
    font-size: var(--font-size-lg);
    margin: 0;
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
}

.subject-attempts {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.subject-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 1;
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.stat-value {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

.stat-value.correct {
    color: var(--color-success);
}

.stat-value.wrong {
    color: var(--color-danger);
}

/* Progress Section */
.progress-section {
    margin-bottom: var(--spacing-lg);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.accuracy-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.accuracy-value {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
}

.accuracy-value.accuracy-red {
    color: #e74c3c;
}

.accuracy-value.accuracy-yellow {
    color: #f39c12;
}

.accuracy-value.accuracy-green {
    color: #27ae60;
}

/* Progress Bar */
.progress-container {
    background: var(--color-border);
    border-radius: var(--border-radius-full);
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: var(--border-radius-full);
    transition: width var(--transition-normal);
}

.progress-bar.accuracy-red {
    background: linear-gradient(90deg, #e74c3c 0%, #c0392b 100%);
}

.progress-bar.accuracy-yellow {
    background: linear-gradient(90deg, #f39c12 0%, #d68910 100%);
}

.progress-bar.accuracy-green {
    background: linear-gradient(90deg, #27ae60 0%, #1e8449 100%);
}

/* Subject Time */
.subject-time {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.time-label {
    font-size: var(--font-size-sm);
}

.time-value {
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.empty-message {
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-message p {
    margin: 0;
    font-size: var(--font-size-base);
}

/* Test History Table */
.history-table-wrapper {
    overflow-x: auto;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-bg-primary);
}

.history-table thead {
    background: var(--color-bg-secondary);
    border-bottom: 2px solid var(--color-border);
}

.history-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

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

.history-row.even {
    background: var(--color-bg-primary);
}

.history-row.odd {
    background: var(--color-bg-secondary);
}

.history-row:hover {
    opacity: 0.8;
}

.date-cell {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.subject-cell {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.score-cell {
    font-weight: var(--font-weight-bold);
}

.accuracy-cell {
    font-weight: var(--font-weight-bold);
}

.accuracy-cell.accuracy-red {
    color: #e74c3c;
}

.accuracy-cell.accuracy-yellow {
    color: #f39c12;
}

.accuracy-cell.accuracy-green {
    color: #27ae60;
}

.time-cell {
    color: var(--color-text-secondary);
}

/* Empty History State */
.history-empty {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.history-empty p {
    margin: var(--spacing-md) 0;
}

.empty-hint {
    font-size: var(--font-size-sm);
}

/* Dashboard Empty State */
.dashboard-empty {
    text-align: center;
    padding: var(--spacing-xxl);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
}

.dashboard-empty h2 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.dashboard-empty p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.empty-state-link {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
}

.empty-state-link:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* Dashboard Loading State */
.dashboard-loading {
    text-align: center;
    padding: var(--spacing-xxl);
}

.dashboard-loading .spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.dashboard-loading p {
    margin-top: var(--spacing-lg);
    color: var(--color-text-secondary);
}

/* Dashboard Actions */
.dashboard-actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.action-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-lg);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    font-size: var(--font-size-base);
}

.primary-btn {
    background: var(--color-accent);
    color: white;
}

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

.secondary-btn {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.secondary-btn:hover {
    background: var(--color-border);
    transform: translateY(-2px);
}

/* Error Message */
.error-message {
    background: #fde7e7;
    color: #c0392b;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-lg);
    border-left: 4px solid #c0392b;
}

/* Dashboard Responsive Design */
@media (max-width: 768px) {
    .dashboard-main {
        gap: var(--spacing-lg);
        padding: var(--spacing-md);
    }

    .dashboard-section {
        padding: var(--spacing-lg);
    }

    .overview-cards {
        grid-template-columns: 1fr;
    }

    .subject-cards {
        grid-template-columns: 1fr;
    }

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

    .action-button {
        width: 100%;
        text-align: center;
    }

    .history-table {
        font-size: var(--font-size-sm);
    }

    .history-table th,
    .history-table td {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-size-lg);
    }

    .card-value {
        font-size: 1.5rem;
    }

    .subject-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .overview-card {
        padding: var(--spacing-md);
    }
}

/* OTP Input Styling */
.otp-input {
    font-size: var(--font-size-lg) !important;
    letter-spacing: 8px !important;
    text-align: center !important;
    font-weight: bold !important;
    font-family: 'Courier New', monospace !important;
    padding: var(--spacing-md) !important;
}

.otp-input:focus {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1) !important;
}

.otp-input::placeholder {
    letter-spacing: 3px;
}

/* ============================================================================
   HAMBURGER MENU - MOBILE NAVIGATION (HIGH-END)
   ========================================================================== */

.hamburger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 12px;
    width: 48px;
    height: 48px;
    z-index: 1001;
    position: relative;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.320, 1);
    border-radius: 8px;
}

.hamburger-menu:active {
    background-color: rgba(var(--color-accent-rgb, 76, 175, 80), 0.1);
    transform: scale(0.95);
}

.hamburger-menu span {
    width: 26px;
    height: 3px;
    background-color: var(--color-text-primary);
    border-radius: 3px;
    transition: all 0.35s cubic-bezier(0.23, 1, 0.320, 1);
    transform-origin: center;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu - Premium Implementation */
.header {
    position: relative;
    z-index: 9998;
}

/* Top-down slide-down mobile menu that pushes content down when opened.
   Uses max-height transition, overflow hidden for collapsed state.
   Background is solid (no transparency) and respects light/dark mode. */
.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: 0; /* collapsed */
    overflow: hidden;
    background-color: #ffffff; /* explicit solid background for light */
    color: var(--color-text-primary);
    z-index: 9999; /* above page content */
    display: block;
    flex-direction: column;
    transition: max-height 320ms ease;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

/* Dark mode: solid black background (no transparency) */
html[data-theme='dark'] .mobile-menu {
    background-color: #000000;
    color: #ffffff;
}

/* When header has .open, expand the menu via max-height and push content down */
.header.open .mobile-menu {
    max-height: var(--mobile-menu-height, 360px); /* tuned for expected menu height */
}

/* Push the page content down smoothly when menu opens. This uses a fixed
   CSS variable that mirrors the mobile menu max-height so content is not
   visible behind the menu. */
.header.open + .landing-page {
    margin-top: var(--mobile-menu-height, 360px);
    transition: margin-top 320ms ease;
}

/* Make hamburger icon transform into close icon when header is open */
.header.open .hamburger-menu span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}
.header.open .hamburger-menu span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}
.header.open .hamburger-menu span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile menu header with user info - Premium styling */
.mobile-menu-header {
    padding: 24px 20px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    display: flex;
    align-items: center;
    gap: 16px;
    color: white;
    box-shadow: 0 8px 24px rgba(76, 175, 80, 0.12);
    border-radius: 0;
}

.mobile-menu-user {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.mobile-user-icon {
    font-size: 2rem;
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-user .user-email {
    font-size: 13px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    word-break: break-word;
    line-height: 1.3;
}

/* Mobile menu navigation section */
.mobile-menu-nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 12px 0;
    flex: 1;
}

.mobile-menu-link {
    padding: 16px 20px;
    border: none;
    background: transparent;
    color: var(--color-text-primary);
    cursor: pointer;
    text-align: left;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.25s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    position: relative;
    pointer-events: auto;
    border-bottom: 1px solid var(--color-border);
    margin: 0;
}

.mobile-menu-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    opacity: 0;
    transition: opacity 0.25s ease;
}

.mobile-menu-link:active {
    background-color: var(--color-bg-secondary);
    transform: translateX(2px);
}

.mobile-menu-link:hover {
    background-color: var(--color-bg-secondary);
    transform: translateX(4px);
}

.mobile-menu-link:hover::before {
    opacity: 1;
}

.mobile-menu-icon {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    transition: transform 0.25s ease;
}

.mobile-menu-link:hover .mobile-menu-icon {
    transform: scale(1.1);
}

.mobile-menu-link.logout-button {
    color: var(--color-danger);
    font-weight: 600;
    margin-top: auto;
}

.mobile-menu-link.logout-button::before {
    background: linear-gradient(135deg, var(--color-danger), #dc3545);
}

.mobile-menu-link.logout-button:hover {
    background-color: rgba(220, 53, 69, 0.08);
}

.mobile-menu-link.logout-button .mobile-menu-icon {
    color: var(--color-danger);
}

/* Mobile menu footer with theme toggle - Premium styling */
.mobile-menu-footer {
    margin-top: auto;
    border-top: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    background: var(--color-bg-secondary);
    padding: 12px 0;
}

.mobile-theme-toggle {
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    text-align: left;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.25s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    padding: 16px 20px;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}

.mobile-theme-toggle::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.mobile-theme-toggle:active {
    background-color: var(--color-bg-primary);
    transform: translateX(2px);
}

.mobile-theme-toggle:hover {
    background-color: var(--color-bg-primary);
    transform: translateX(4px);
}

.mobile-theme-toggle:hover::before {
    opacity: 1;
}

/* ============================================================================
   RESPONSIVE - MOBILE HAMBURGER MENU BREAKPOINT
   ========================================================================== */

@media (max-width: 768px) {
    .hamburger-menu {
        display: flex;
    }

    .theme-toggle {
        display: none !important;
    }

    .dashboard-link,
    .user-info,
    #logoutBtn {
        display: none !important;
    }
}

/* Compact mobile menu item sizing so all buttons (logout, theme) are visible */
@media (max-width: 768px) {
    /* Reduce vertical padding and slightly smaller font for compactness */
    .mobile-menu-link,
    .mobile-theme-toggle {
        padding: 10px 14px;
        font-size: 15px;
        line-height: 1.2;
    }

    /* Smaller icons to save horizontal space */
    .mobile-menu-icon {
        font-size: 1.1rem;
        min-width: 22px;
    }

    /* Reduce header and footer padding to free space */
    .mobile-menu-header {
        padding: 12px 12px;
    }

    .mobile-menu-footer {
        padding: 8px 0;
    }

    /* Ensure the max-height variable is slightly smaller so content fits */
    :root {
        --mobile-menu-height: 300px;
    }

    /* Ensure logout button sits at bottom but is visible */
    .mobile-menu-link.logout-button {
        padding: 10px 14px;
        margin-top: 8px;
    }
}

/* ============================================================================
   SYLLABUS PAGE STYLES
   
   Styles for the syllabus download page with subject cards and view buttons.
   ========================================================================== */

.syllabus-section {
    margin-bottom: var(--spacing-xxl);
    width: 100%;
}

.syllabus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
    width: 100%;
}

/* Syllabus item card */
.syllabus-item {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 280px;
    box-shadow: var(--shadow-sm);
}

.syllabus-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* Syllabus header with icon and title */
.syllabus-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.syllabus-icon {
    font-size: 2.5rem;
    transition: transform var(--transition-normal);
}

.syllabus-item:hover .syllabus-icon {
    transform: scale(1.15) rotate(3deg);
}

.syllabus-item h3 {
    margin: 0;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

/* Syllabus description */
.syllabus-description {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* View Syllabus button */
.view-btn {
    background: var(--color-accent);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    align-self: stretch;
    margin-top: auto;
}

.view-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.view-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Responsive syllabus grid on mobile */
@media (max-width: 768px) {
    /* Hide syllabus link from desktop header on mobile */
    .syllabus-link {
        display: none !important;
    }

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

    .syllabus-item {
        min-height: 220px;
    }

    .syllabus-icon {
        font-size: 2rem;
    }

    .view-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

/* Desktop view - ensure syllabus content is visible */
@media (min-width: 769px) {
    .syllabus-link-mobile {
        display: none !important;
    }
    
    .hamburger-menu {
        display: none !important;
    }
}

/* ============================================================================
   PASSWORD RESET PAGE STYLES
   ========================================================================== */

.auth-main {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    padding: var(--spacing-xl);
}

.auth-section {
    width: 100%;
    max-width: 500px;
}

.auth-container {
    background: var(--color-bg-secondary);
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.auth-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-sm) 0;
    text-align: center;
}

.auth-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: 0 0 var(--spacing-xl) 0;
    text-align: center;
}

.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input {
    padding-right: 40px;
}

.password-toggle {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    color: var(--color-text-secondary);
    padding: 4px 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.password-toggle:hover {
    color: var(--color-text-primary);
}

.form-help {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.success-message {
    background-color: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.3);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--color-success);
    font-size: var(--font-size-base);
    text-align: center;
}

.auth-footer {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.auth-footer p {
    margin: 0;
    color: var(--color-text-secondary);
}

.auth-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
}

.auth-link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Loading state for password reset */
.loading-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    text-align: center;
}

.loading-state p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

@media (max-width: 768px) {
    .auth-main {
        min-height: 80vh;
        padding: var(--spacing-lg);
    }

    .auth-container {
        padding: var(--spacing-lg);
    }

    .auth-title {
        font-size: var(--font-size-lg);
    }
}

/* ============================================================================
   PAYWALL MODAL STYLES
   ========================================================================== */

.paywall-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.paywall-modal-content {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border-radius: 12px;
    max-width: 650px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideInUp 0.4s ease-out;
}

.paywall-header {
    padding: 2rem;
    border-bottom: 2px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.paywall-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--color-accent);
}

.paywall-close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.paywall-close-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-md);
}

.paywall-body {
    padding: 2rem;
}

.paywall-message {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--color-text-primary);
    line-height: 1.6;
}

.subscription-plans {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.plan-card {
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    background: var(--color-bg-secondary);
    transition: all var(--transition-normal);
    position: relative;
}

.plan-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.plan-card.featured {
    border-color: var(--color-accent);
    background: rgba(0, 123, 255, 0.05);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.5px;
}

.plan-card h3 {
    margin-top: 0;
    color: var(--color-text-primary);
    font-size: 1.3rem;
}

.plan-price {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin: 1rem 0;
    color: var(--color-accent);
}

.discount {
    font-size: 0.9rem;
    color: var(--color-success);
    margin-left: 0.5rem;
}

.plan-benefits {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
    text-align: left;
}

.plan-benefits li {
    padding: 0.5rem 0;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.plan-btn {
    background: var(--color-accent);
    color: white;
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: 6px;
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    width: 100%;
    transition: all var(--transition-normal);
    font-size: 1rem;
}

.plan-btn:hover {
    background: var(--color-accent-hover);
    transform: scale(1.02);
}

.plan-btn:active {
    transform: scale(0.98);
}

.plan-btn.featured-btn {
    background: var(--color-accent);
    font-weight: var(--font-weight-bold);
}

.paywall-footer {
    padding: 2rem;
    border-top: 2px solid var(--color-border);
    text-align: center;
}

.close-paywall-btn {
    background: var(--color-text-secondary);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
}

.close-paywall-btn:hover {
    background: var(--color-text-primary);
}

/* ============================================================================
   PRICING MODAL STYLES
   ========================================================================== */

.pricing-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.pricing-modal-content {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border-radius: 12px;
    max-width: 1000px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideInUp 0.4s ease-out;
}

.pricing-header {
    padding: 2rem;
    border-bottom: 2px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--color-accent), rgba(0, 123, 255, 0.7));
    color: white;
    border-radius: 12px 12px 0 0;
}

.pricing-header h2 {
    margin: 0;
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
}

.pricing-close-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: white;
    padding: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    border-radius: 6px;
}

.pricing-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.pricing-body {
    padding: 3rem 2rem;
}

.pricing-intro {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.pricing-plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.pricing-card {
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    background: var(--color-bg-secondary);
    transition: all var(--transition-normal);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 123, 255, 0.15);
}

.pricing-card.free-card {
    opacity: 0.85;
}

.pricing-card.featured {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.08), rgba(76, 175, 80, 0.05));
    transform: scale(1.02);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.5px;
}

.pricing-card h3 {
    margin: 0.5rem 0 0.5rem 0;
    color: var(--color-text-primary);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
}

.plan-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin: 0.5rem 0 1.5rem 0;
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin: 1rem 0 0.5rem 0;
    color: var(--color-accent);
}

.per-period {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-left: 0.5rem;
    font-weight: normal;
}

.pricing-benefits {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 2rem 0;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.pricing-benefits li {
    padding: 0.6rem 0;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.pricing-benefits li:last-child {
    border-bottom: none;
}

.pricing-btn {
    background: var(--color-text-secondary);
    color: white;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    width: 100%;
    transition: all var(--transition-normal);
    font-size: 1rem;
    margin-top: auto;
}

.pricing-btn:hover:not(:disabled) {
    background: var(--color-text-primary);
    transform: scale(1.02);
}

.pricing-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.pricing-btn.primary-btn {
    background: var(--color-accent);
}

.pricing-btn.primary-btn:hover {
    background: var(--color-accent-hover);
}

.pricing-btn.featured-btn {
    background: #4CAF50;
    font-size: 1.05rem;
}

.pricing-btn.featured-btn:hover {
    background: #45a049;
}

.pricing-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

/* Comparison Table */
.pricing-comparison {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--color-border);
}

.pricing-comparison h3 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    color: var(--color-text-primary);
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-bg-secondary);
    border-radius: 8px;
    overflow: hidden;
}

.pricing-table thead {
    background: var(--color-accent);
    color: white;
}

.pricing-table th {
    padding: 1.2rem;
    text-align: left;
    font-weight: var(--font-weight-bold);
    border-right: 1px solid var(--color-border);
}

.pricing-table th:last-child {
    border-right: none;
}

.pricing-table td {
    padding: 1rem 1.2rem;
    border-bottom: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}

.pricing-table td:last-child {
    border-right: none;
}

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

.pricing-table tbody tr:nth-child(odd) {
    background: var(--color-bg-primary);
}

.pricing-table tbody tr:nth-child(even) {
    background: var(--color-bg-secondary);
}

.pricing-footer {
    padding: 1.5rem 2rem;
    border-top: 2px solid var(--color-border);
    text-align: center;
    background: var(--color-bg-secondary);
    border-radius: 0 0 12px 12px;
}

.pricing-note {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* ============================================================================
   PRICING BUTTON IN NAVBAR
   ========================================================================== */

.pricing-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.95rem;
}

.pricing-button:hover {
    background: linear-gradient(135deg, #45a049, #3d8b40);
    transform: scale(1.05);
}

.pricing-button:active {
    transform: scale(0.95);
}

/* Mobile menu pricing link */
.pricing-link-mobile {
    color: var(--color-text-primary) !important;
}

/* Syllabus locked teaser */
.syllabus-locked {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border: 2px dashed var(--color-border);
}

.syllabus-locked h2 {
    color: var(--color-accent);
    margin-top: 0;
}

.syllabus-locked p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

/* Responsive design for paywall */
@media (max-width: 768px) {
    .paywall-modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .paywall-header {
        padding: 1.5rem;
    }

    .paywall-body {
        padding: 1.5rem;
    }

    .paywall-footer {
        padding: 1.5rem;
    }

    .subscription-plans {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .plan-price {
        font-size: 1.5rem;
    }

    .paywall-message {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .paywall-modal-content {
        width: 98%;
    }

    .plan-card {
        padding: 1rem;
    }

    .plan-card h3 {
        font-size: 1.1rem;
    }

    .plan-price {
        font-size: 1.3rem;
    }

    .plan-benefits li {
        font-size: 0.9rem;
    }

    .plan-btn {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }
}