/* ===== CSS Variables ===== */
:root {
    --primary-color: #9333ea;
    --primary-dark: #7e22ce;
    --primary-light: #c084fc;
    --secondary-color: #a855f7;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.3s ease;
}

/* ===== Dark Mode Variables ===== */
[data-theme="dark"] {
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-light: #64748b;
    --bg-primary: #1e293b;
    --bg-secondary: #0f172a;
    --bg-tertiary: #334155;
    --bg-hover: #475569;
    --border-color: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

/* Dark Mode Hover State Fixes */
[data-theme="dark"] .nav-links a:hover,
[data-theme="dark"] .nav-links a.active {
    background: var(--bg-hover);
}

[data-theme="dark"] .topic-card:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .paper-card:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .quiz-option:hover:not(:disabled) {
    background: var(--bg-hover);
}

[data-theme="dark"] .btn-social:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .resource-item:hover,
[data-theme="dark"] .tutorial-item:hover,
[data-theme="dark"] .practice-item:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .quiz-table tr:hover td {
    background: var(--bg-hover);
}

[data-theme="dark"] .category-tile:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .subject-tile:hover {
    background: var(--bg-hover);
}

[data-theme="dark"] .btn-override:hover {
    background: var(--bg-hover);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

/* ===== Navbar ===== */
.navbar {
    background: var(--bg-primary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

/* ===== Main Content ===== */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ===== Landing Page - Hero Section ===== */
.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius-xl);
    color: white;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Subjects Section ===== */
.subjects-section {
    margin-bottom: 3rem;
}

.subjects-section h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.scroll-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.subjects-container {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    padding: 1rem 0.5rem;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-light) var(--bg-tertiary);
}

.subjects-container::-webkit-scrollbar {
    height: 8px;
}

.subjects-container::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.subjects-container::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: var(--radius-md);
}

.subjects-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* ===== Subject Tiles ===== */
.subject-tile {
    flex: 0 0 280px;
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
    scroll-snap-align: start;
    border: 2px solid transparent;
}

.subject-tile:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.tile-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.subject-tile h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* ===== Features Section ===== */
.features-section {
    margin-bottom: 3rem;
}

.features-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* ===== Subject Page ===== */
.subject-page {
    max-width: 1000px;
    flex: 1;
}

.subject-header {
    margin-bottom: 2rem;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.back-link:hover {
    color: var(--primary-color);
}

.subject-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.subject-header p {
    color: var(--text-secondary);
}

/* ===== Categories Section ===== */
.categories-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.category-tile {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border-left: 4px solid transparent;
}

.category-tile.resources {
    border-left-color: var(--primary-color);
}

.category-tile.tutorials {
    border-left-color: #3b82f6; /* Blue for tutorials */
}

.category-tile.practice {
    border-left-color: var(--success-color);
}

.category-tile:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.category-tile h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

.tile-arrow {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--text-light);
    transition: var(--transition);
}

.category-tile:hover .tile-arrow {
    right: 1rem;
    color: var(--primary-color);
}

/* ===== Content Sections ===== */
.content-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-top: 2rem;
    overflow: hidden;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.content-header h2 {
    font-size: 1.25rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--danger-color);
}

.content-body {
    padding: 1.5rem 2rem;
}

/* Resource Tabs */
.resource-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
    overflow-x: auto;
}

.resource-tab {
    padding: 0.75rem 1.25rem;
    background: none;
    border: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
}

.resource-tab:hover {
    color: var(--primary-color);
}

.resource-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.resource-tab-content {
    display: none;
}

.resource-tab-content.active {
    display: block;
}

/* Practice Tab Content */
.practice-tab-content {
    display: none;
}

.practice-tab-content.active {
    display: block;
}

/* Practice Scores */
#practice-scores-container .no-scores {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.scores-list {
    display: grid;
    gap: 0.75rem;
}

.scores-list .score-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.scores-list .score-card:hover {
    border-color: var(--primary-light);
}

/* Topics Grid */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
}

.topic-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.topic-card:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.topic-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.topic-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.topic-card p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.no-topics,
.no-papers {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

.loading-topics,
.loading-papers {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

@media (max-width: 480px) {
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Full Paper Practice Styles */
.full-paper-intro {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.papers-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.paper-year-group {
    margin-bottom: 0.5rem;
}

.paper-year-heading {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-light);
}

.paper-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
}

.paper-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.paper-card:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

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

.paper-info {
    flex: 1;
    min-width: 0;
}

.paper-info h5 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}

.paper-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.paper-arrow {
    color: var(--primary-color);
    font-weight: 600;
    flex-shrink: 0;
}

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

/* Resource Items */
.resource-item,
.tutorial-item,
.practice-item {
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.resource-item:hover,
.tutorial-item:hover,
.practice-item:hover {
    border-color: var(--primary-light);
    background: var(--bg-secondary);
}

.resource-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.resource-info {
    flex: 1;
}

.resource-info h4,
.resource-item h4,
.practice-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.resource-info p,
.resource-item p,
.practice-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0;
}

.resource-item > .btn-primary {
    flex-shrink: 0;
}

/* Tutorial Items */
.tutorial-item {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.video-placeholder {
    width: 100px;
    height: 70px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tutorial-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.tutorial-info p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

/* Practice Stats */
.practice-stats {
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

/* Buttons */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
}

/* ===== Auth Page ===== */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: 2rem;
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-form {
    background: var(--bg-primary);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.auth-form h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.auth-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(147, 51, 234, 0.1);
}

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

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--primary-color);
}

.forgot-link {
    color: var(--primary-color);
    font-weight: 500;
}

.btn-auth {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.auth-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    padding: 0 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.social-auth {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-social {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-social:hover {
    background: var(--bg-tertiary);
}

.btn-social svg {
    flex-shrink: 0;
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-switch a {
    font-weight: 600;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* Auth Loading Spinner */
.auth-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 200px;
    gap: 1rem;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Footer ===== */
.footer {
    background: var(--bg-primary);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    flex-shrink: 0;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .nav-brand a {
        font-size: 1.25rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        padding: 0.5rem;
        font-size: 0.875rem;
    }

    main {
        padding: 1rem;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .subjects-section h2,
    .features-section h2 {
        font-size: 1.5rem;
    }

    .subject-tile {
        flex: 0 0 240px;
        padding: 1.5rem;
    }

    .auth-form {
        padding: 1.5rem;
    }

    .tutorial-item {
        flex-direction: column;
        text-align: center;
    }

    .content-header,
    .content-body {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .form-options {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

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

/* ===== Profile Page ===== */
.profile-page {
    max-width: 800px;
    margin: 0 auto;
    flex: 1;
}

.profile-header {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    font-weight: 600;
}

.profile-info h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

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

.profile-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
}

.profile-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

/* Streak Tracker */
.streak-container {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.streak-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-xl);
    color: white;
    min-width: 140px;
}

.streak-fire {
    font-size: 2.5rem;
    margin-bottom: 0.25rem;
}

.streak-fire.inactive {
    filter: grayscale(100%);
    opacity: 0.5;
}

.streak-count {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
}

.streak-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-top: 0.25rem;
}

.streak-info {
    display: flex;
    gap: 2rem;
}

.streak-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.streak-stat .stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.streak-stat .stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.streak-hint {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}

.streak-hint.completed {
    color: var(--success-color);
}

/* Theme Toggle */
.theme-toggle-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.theme-toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle-label span {
    font-size: 1.25rem;
}

.theme-toggle {
    position: relative;
    width: 60px;
    height: 32px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: var(--transition);
    border-radius: 32px;
    border: 2px solid var(--border-color);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 2px;
    bottom: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
    border-radius: 50%;
}

.theme-toggle input:checked + .toggle-slider {
    background-color: var(--primary-light);
}

.theme-toggle input:checked + .toggle-slider:before {
    transform: translateX(28px);
}

/* Score Cards */
.scores-container {
    display: grid;
    gap: 1.5rem;
}

.subject-scores-group {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.subject-group-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.subject-group-title .subject-icon {
    font-size: 1.25rem;
}

.subject-scores-group .score-card {
    margin-bottom: 0.5rem;
}

.subject-scores-group .score-card:last-child {
    margin-bottom: 0;
}

.score-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.score-card:hover {
    border-color: var(--primary-light);
}

.score-subject {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.score-subject .subject-icon {
    font-size: 1.5rem;
}

.score-subject h4 {
    font-size: 1rem;
    margin-bottom: 0.125rem;
}

.score-subject p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.score-value {
    text-align: right;
}

.score-percentage {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.score-percentage.excellent {
    color: var(--success-color);
}

.score-percentage.good {
    color: var(--primary-color);
}

.score-percentage.average {
    color: var(--warning-color);
}

.score-percentage.needs-work {
    color: var(--danger-color);
}

.score-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.no-scores {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.no-scores p {
    margin-bottom: 1rem;
}

/* Logout Button */
.btn-logout {
    width: 100%;
    background: transparent;
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-logout:hover {
    background: var(--danger-color);
    color: white;
}

/* Nav User Menu */
.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.nav-avatar:hover {
    transform: scale(1.05);
}

@media (max-width: 768px) {
    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .score-card {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .score-subject {
        flex-direction: column;
    }

    .score-value {
        text-align: center;
    }
}

/* ===== Quiz Modal ===== */
.quiz-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: 1000;
    padding: 1rem;
}

.quiz-container {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.quiz-header h2 {
    font-size: 1.25rem;
    margin: 0;
}

.quiz-progress-container {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
}

.quiz-progress-container span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
}

.quiz-progress-track {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.quiz-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    transition: width 0.3s ease;
    width: 20%;
}

.quiz-question {
    padding: 2rem;
    font-size: 1.25rem;
    font-weight: 500;
    text-align: center;
    line-height: 1.5;
}

.quiz-paper-reference {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0 2rem;
    margin-top: -1rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.quiz-paper-reference.hidden {
    display: none;
}

.quiz-answer-input {
    display: flex;
    gap: 0.75rem;
    padding: 0 2rem 1.5rem;
}

.quiz-answer-input input {
    flex: 1;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.quiz-answer-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.quiz-answer-input input.incorrect {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-answer-input input:disabled {
    opacity: 0.8;
    cursor: not-allowed;
}

/* Answer Result Feedback */
.quiz-result-feedback {
    margin: 1rem 2rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.quiz-result-feedback.correct {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.quiz-result-feedback.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.quiz-result-feedback.hidden {
    display: none;
}

.correct-label, .incorrect-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Answer Actions (Override & Next) */
.quiz-answer-actions {
    margin: 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.quiz-answer-actions.hidden {
    display: none;
}

.override-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.override-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.btn-override {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-override:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-override.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-next {
    min-width: 150px;
}

.quiz-answer-input button {
    padding: 1rem 1.5rem;
    white-space: nowrap;
}

.quiz-feedback {
    margin: 0 2rem 1rem;
    padding: 1rem;
    background: rgba(251, 191, 36, 0.15);
    border: 1px solid rgba(251, 191, 36, 0.4);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.quiz-feedback.hidden {
    display: none;
}

.quiz-correct-answer {
    margin: 0 2rem 1rem;
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
    max-height: 300px;
    overflow-y: auto;
}

.quiz-correct-answer.hidden {
    display: none;
}

.quiz-working-steps {
    margin: 0 2rem 1rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
    max-height: 200px;
    overflow-y: auto;
}

.quiz-working-steps.hidden {
    display: none;
}

/* Quiz Diagram Styles */
.quiz-diagram-container {
    margin: 1rem 2rem;
    text-align: center;
}

.quiz-diagram-container.hidden {
    display: none;
}

.quiz-diagram-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    background: var(--bg-primary);
    object-fit: contain;
}

/* Quiz Table Styles */
.quiz-table-container {
    margin: 1rem 2rem;
    overflow-x: auto;
}

.quiz-table-container.hidden {
    display: none;
}

.quiz-table-wrapper {
    overflow-x: auto;
}

.quiz-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.quiz-table th,
.quiz-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.quiz-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-table td {
    color: var(--text-secondary);
}

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

.quiz-table tr:hover td {
    background: var(--bg-secondary);
}

.quiz-table-image {
    max-width: 100%;
    max-height: 250px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    object-fit: contain;
}

/* Answer Diagram Container */
.quiz-answer-diagram-container {
    margin: 1rem 2rem;
    text-align: center;
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-md);
}

.quiz-answer-diagram-container.hidden {
    display: none;
}

.quiz-answer-diagram-container::before {
    content: 'Solution Diagram:';
    display: block;
    font-weight: 600;
    color: var(--success-color);
    margin-bottom: 0.75rem;
    text-align: left;
}

.quiz-feedback {
    max-height: 200px;
    overflow-y: auto;
}

.quiz-self-assessment {
    margin: 1.5rem 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    text-align: center;
}

.quiz-self-assessment p {
    margin-bottom: 1rem;
    font-weight: 500;
}

.quiz-self-assessment.hidden {
    display: none;
}

.assessment-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-success {
    padding: 0.75rem 1.5rem;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-success:hover {
    opacity: 0.9;
}

.btn-danger {
    padding: 0.75rem 1.5rem;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-danger:hover {
    opacity: 0.9;
}

.quiz-options {
    padding: 0 2rem 2rem;
    display: grid;
    gap: 0.75rem;
}

.quiz-option {
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

.quiz-option:disabled {
    cursor: not-allowed;
}

.quiz-option.correct {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--success-color);
    color: var(--success-color);
}

.quiz-option.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* Quiz Result */
.quiz-result {
    padding: 2rem;
    text-align: center;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.quiz-result h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-score {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 1rem;
}

.result-score span:first-child {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-percentage {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.quiz-result p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.result-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

@media (max-width: 480px) {
    .quiz-container {
        max-height: 95vh;
        margin: 0.5rem;
        width: calc(100% - 1rem);
        max-width: none;
    }

    .quiz-header,
    .quiz-progress-container,
    .quiz-question,
    .quiz-options,
    .quiz-result {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .quiz-question {
        font-size: 1rem;
        padding: 1rem;
    }

    .quiz-answer-input {
        padding: 0 1rem 1rem;
        flex-direction: column;
        gap: 0.75rem;
    }

    .quiz-answer-input input {
        width: 100%;
    }

    .quiz-answer-input button {
        width: 100%;
    }

    .quiz-correct-answer,
    .quiz-working-steps,
    .quiz-feedback {
        margin: 0.75rem 1rem;
    }

    .quiz-result-feedback {
        margin: 0.75rem 1rem;
    }

    .quiz-answer-actions {
        margin: 1rem;
    }

    .override-section {
        flex-direction: column;
        gap: 0.5rem;
    }

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

    .result-actions button,
    .result-actions a {
        width: 100%;
    }

    /* Navbar mobile */
    .navbar {
        padding: 0.75rem 1rem;
    }

    .nav-brand a {
        font-size: 1.1rem;
    }

    .nav-links {
        gap: 0.5rem;
    }

    .nav-links a {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }

    /* Hero section mobile */
    .hero {
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    /* Subject tiles mobile */
    .subject-tile {
        flex: 0 0 220px;
        padding: 1.5rem;
    }

    /* Topic cards mobile */
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .topic-card {
        padding: 1rem 0.75rem;
    }

    .topic-icon {
        font-size: 1.5rem;
    }

    .topic-card h4 {
        font-size: 0.8rem;
    }

    /* Paper cards mobile */
    .paper-cards {
        grid-template-columns: 1fr;
    }

    .paper-card {
        padding: 0.875rem;
    }

    /* Category tiles mobile */
    .categories-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .category-tile {
        padding: 1.25rem;
    }

    /* Video placeholder mobile */
    .video-placeholder {
        width: 60px;
        height: 45px;
        font-size: 1.2rem;
    }

    /* Resource tabs mobile */
    .resource-tabs {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .resource-tab {
        flex: 1 1 auto;
        min-width: 0;
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
        text-align: center;
    }

    /* Content sections mobile */
    .content-header {
        padding: 1rem;
    }

    .content-body {
        padding: 1rem;
    }

    /* Resource items mobile - fix download button alignment */
    .resource-item,
    .tutorial-item,
    .practice-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: 0.75rem;
        padding: 1rem;
    }

    .resource-icon {
        font-size: 1.5rem;
    }

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

    .resource-info h4 {
        font-size: 0.9rem;
    }

    .resource-info p {
        font-size: 0.8rem;
    }

    .resource-item > .btn-primary,
    .resource-item > button {
        width: 100%;
        margin-top: 0.5rem;
    }

    /* Diagram container mobile */
    .quiz-diagram-container {
        margin: 0.75rem 1rem;
    }

    .quiz-diagram-image {
        max-height: 200px;
    }

    /* Table container mobile */
    .quiz-table-container {
        margin: 0.75rem 1rem;
    }

    .quiz-table th,
    .quiz-table td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
}

/* Extra small devices (320px and below) */
@media (max-width: 360px) {
    .navbar {
        padding: 0.5rem 0.75rem;
    }

    .nav-brand a {
        font-size: 1rem;
    }

    .nav-links a {
        padding: 0.3rem 0.5rem;
        font-size: 0.75rem;
    }

    .hero h1 {
        font-size: 1.25rem;
    }

    .subject-tile {
        flex: 0 0 180px;
        padding: 1.25rem;
    }

    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .topic-card {
        padding: 0.75rem 0.5rem;
    }

    .topic-icon {
        font-size: 1.25rem;
        margin-bottom: 0.25rem;
    }

    .topic-card h4 {
        font-size: 0.75rem;
    }

    .topic-card p {
        font-size: 0.65rem;
    }

    .quiz-question {
        font-size: 0.95rem;
    }

    .quiz-answer-input input {
        padding: 0.75rem;
        font-size: 0.9rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
}

/* Tablet breakpoint */
@media (min-width: 481px) and (max-width: 768px) {
    .subject-tile {
        flex: 0 0 240px;
    }

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

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

    .quiz-container {
        max-width: 90%;
    }
}

/* ===== Subscription & Pricing Styles ===== */

/* Profile Subscription Section */
.subscription-section .subscription-info {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.subscription-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.subscription-label {
    color: var(--text-secondary);
}

.subscription-tier {
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
}

.subscription-tier.free {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.subscription-tier.premium {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.subscription-divider {
    height: 1px;
    background: var(--border-color);
    margin: 1rem 0;
}

.usage-stats h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.usage-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.upgrade-btn {
    width: 100%;
    margin-top: 1rem;
}

/* Pricing Page */
.pricing-page {
    padding: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    flex: 1;
}

.pricing-header {
    text-align: center;
    margin-bottom: 3rem;
}

.pricing-header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pricing-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

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

.pricing-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    position: relative;
    transition: var(--transition);
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.pricing-card-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.pricing-card-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    color: var(--text-secondary);
}

.pricing-features ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1.5rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 20px;
    text-align: center;
    font-weight: bold;
}

.feature-included .feature-icon {
    color: var(--success-color);
}

.feature-limited .feature-icon {
    color: var(--text-light);
}

.feature-limited span:last-child {
    color: var(--text-light);
    text-decoration: line-through;
}

.pricing-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
}

.pricing-faq {
    margin-top: 3rem;
}

.pricing-faq h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.faq-item {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
}

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.faq-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Upgrade Modal */
.upgrade-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1100;
    padding: 1rem;
}

.upgrade-modal.hidden {
    display: none;
}

.upgrade-container {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    max-width: 400px;
    width: 100%;
    text-align: center;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

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

.upgrade-container .close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.upgrade-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.upgrade-container h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.upgrade-reason {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.upgrade-countdown {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.upgrade-countdown p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.countdown-timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.upgrade-benefits {
    text-align: left;
    margin-bottom: 1.5rem;
}

.upgrade-benefits h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.upgrade-benefits ul {
    list-style: none;
    padding: 0;
}

.upgrade-benefits li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.benefit-check {
    color: var(--success-color);
    font-weight: bold;
}

.upgrade-price {
    margin-bottom: 1.5rem;
}

.price-tag {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.upgrade-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.upgrade-now-btn {
    text-decoration: none;
    display: block;
}

/* Payment Modal */
.payment-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1100;
    padding: 1rem;
}

.payment-modal.hidden {
    display: none;
}

.payment-container {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    max-width: 420px;
    width: 100%;
    text-align: center;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

.payment-container .close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.payment-container .close-btn:hover {
    color: var(--text-primary);
}

.payment-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.payment-container h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.payment-info {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.payment-details {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.payment-plan {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.payment-plan span:first-child {
    font-weight: 500;
    color: var(--text-primary);
}

.payment-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.payment-button-wrapper {
    margin: 1.5rem 0;
    display: flex;
    justify-content: center;
}

.paynow-link {
    display: inline-block;
    transition: transform 0.2s ease;
}

.paynow-link:hover {
    transform: scale(1.05);
}

.paynow-link img {
    max-width: 200px;
    height: auto;
}

.payment-note {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    line-height: 1.5;
}

.payment-note strong {
    color: var(--primary-color);
}

.paynow-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 1rem 2rem;
    font-size: 1rem;
}

.paynow-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner.hidden {
    display: none;
}

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

.payment-error {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    text-align: center;
}

.payment-error.hidden {
    display: none;
}

.payment-success-notification {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--success-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    animation: slideDown 0.3s ease;
    max-width: 90%;
}

.payment-success-notification.info {
    background: var(--primary-color);
}

.payment-success-notification .notification-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.payment-success-notification .notification-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.payment-success-notification .notification-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    margin-left: 1rem;
    opacity: 0.8;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.payment-success-notification .notification-close:hover {
    opacity: 1;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Mobile Pricing Page */
@media (max-width: 480px) {
    .pricing-page {
        padding: 1rem;
    }

    .pricing-header h1 {
        font-size: 1.75rem;
    }

    .pricing-card {
        padding: 1.5rem;
    }

    .price-amount {
        font-size: 2.5rem;
    }

    .upgrade-container {
        padding: 1.5rem;
    }
}