/* ============================================
   WD Lab - Premium Dark Theme Stylesheet
   Darshan University | 2301CS202 Web Designing Lab
   Faculty: Dharmik Vasiyani
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #16161f;
    --bg-card-hover: #1e1e2a;

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7a;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

    --border-color: #2a2a3a;
    --border-light: #3a3a4a;

    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    height: 70px;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
}

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

.logo-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4rem;
    padding: 6rem 2rem 4rem;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #a0a0b0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 60px rgba(99, 102, 241, 0.25);
}

.hero-btn svg {
    transition: transform var(--transition-fast);
}

.hero-btn:hover svg {
    transform: translateX(4px);
}

.hero-visual {
    flex: 1;
    max-width: 550px;
}

.code-window {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.window-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #ff5f56;
}

.dot.yellow {
    background: #ffbd2e;
}

.dot.green {
    background: #27ca40;
}

.window-title {
    margin-left: 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.code-content {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-secondary);
    overflow-x: auto;
}

.code-content code {
    color: #a5b4fc;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

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

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   TA Team Section
   ============================================ */
.ta-team {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.ta-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.ta-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    min-width: 200px;
    transition: all var(--transition-normal);
}

.ta-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.ta-avatar {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin: 0 auto 1rem;
}

.ta-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.ta-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   Lab Preview / Categories
   ============================================ */
.lab-preview {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

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

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.category-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-secondary);
    transform: translateY(-3px);
}

.category-range {
    display: inline-block;
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    margin-bottom: 1rem;
}

.category-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.category-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   Labs Page
   ============================================ */
.labs-page {
    min-height: 100vh;
    padding: 6rem 2rem 4rem;
    max-width: 1400px;
    margin: 0 auto;
}

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

.labs-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.labs-header>p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.search-box {
    position: relative;
    max-width: 500px;
    margin: 0 auto 1.5rem;
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

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

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.6rem 1.25rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.lab-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.lab-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.lab-card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.lab-number {
    background: var(--accent-gradient);
    color: white;
    font-size: 0.85rem;
    font-weight: 700;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lab-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

.lab-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: 1rem;
}

.lab-tag {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    border-radius: 50px;
    font-weight: 500;
}

/* ============================================
   Single Lab Page
   ============================================ */
.lab-page {
    min-height: 100vh;
    padding: 5rem 2rem 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.lab-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.back-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.lab-pagination {
    display: flex;
    gap: 0.75rem;
}

.pagination-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.pagination-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.lab-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
}

.lab-header {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.lab-header-top {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.lab-number-lg {
    background: var(--accent-gradient);
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lab-title {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
}

/* Lab Sections */
.lab-section {
    margin-bottom: 2.5rem;
}

.lab-section:last-child {
    margin-bottom: 0;
}

.lab-section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--accent-primary);
}

.lab-section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Official Question Box */
.official-question {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.question-badge {
    display: inline-block;
    background: var(--accent-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.3rem 0.75rem;
    border-radius: 50px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.question-content {
    color: var(--text-primary);
    line-height: 1.8;
}

.question-content strong {
    color: var(--accent-secondary);
}

.question-content ol,
.question-content ul {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.question-content li {
    margin-bottom: 0.5rem;
}

.question-content .part-label {
    display: block;
    font-weight: 700;
    color: var(--accent-secondary);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

/* Reference Image */
.reference-image-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
}

.reference-image {
    max-width: 100%;
    border-radius: var(--radius-sm);
}

.no-image-placeholder {
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 3rem;
    color: var(--text-muted);
}

/* Lists in Lab Sections */
.lab-list {
    list-style: none;
    padding: 0;
}

.lab-list li {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.lab-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

.lab-list.numbered {
    counter-reset: item;
}

.lab-list.numbered li::before {
    counter-increment: item;
    content: counter(item) '.';
    color: var(--accent-primary);
}

/* Code Blocks */
.code-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.code-block-title {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.copy-btn {
    background: var(--bg-card);
    color: var(--text-secondary);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

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

.code-block pre {
    padding: 1.25rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
    color: #a5b4fc;
}

/* Viva Questions */
.viva-list {
    list-style: none;
    padding: 0;
    counter-reset: viva;
}

.viva-list li {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1rem 1rem 3.5rem;
    margin-bottom: 0.75rem;
    transition: all var(--transition-fast);
}

.viva-list li:hover {
    border-color: var(--accent-primary);
}

.viva-list li::before {
    counter-increment: viva;
    content: 'Q' counter(viva);
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--accent-gradient);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.5rem;
    border-radius: var(--radius-sm);
}

/* Checklist */
.checklist {
    list-style: none;
    padding: 0;
}

.checklist li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.checklist li::before {
    content: '☐';
    color: var(--accent-primary);
    font-size: 1.1rem;
}

/* Challenge Box */
.challenge-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(249, 115, 22, 0.1) 100%);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.challenge-box p {
    color: var(--warning);
    font-weight: 500;
}

/* Mistakes Box */
.mistakes-list li::before {
    content: '⚠';
    color: var(--error);
}

/* Homework Section */
.homework-section {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, rgba(249, 115, 22, 0.05) 100%);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.homework-section .lab-section-title {
    color: var(--warning);
}

.homework-notice {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    color: var(--accent-primary);
    font-weight: 500;
    text-align: center;
}

.hint-box {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-left: 4px solid var(--success);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.hint-box strong {
    color: var(--success);
}

/* Visual Aids Grid */
.visual-aids-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.visual-aid-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: all var(--transition-normal);
}

.visual-aid-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.visual-aid-card h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.visual-aid-image {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 1rem;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-aid-image img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
}

.visual-aid-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.image-placeholder {
    color: var(--text-muted);
    padding: 2rem;
    text-align: center;
}

/* Thinking Process */
.thinking-process {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.thinking-step {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.thinking-step strong {
    color: var(--accent-primary);
}

/* Screenshots Grid */
.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

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

.screenshot-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.screenshot-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.screenshot-label {
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-primary);
    border-bottom: 1px solid var(--border-color);
}

.screenshot-image {
    padding: 1rem;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screenshot-image img {
    max-width: 100%;
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.screenshot-placeholder {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.screenshot-placeholder span {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.screenshot-placeholder p {
    font-size: 0.8rem;
    background: var(--bg-tertiary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    display: inline-block;
    font-family: var(--font-mono);
}

/* Layout Hints Grid */
.layout-hints-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.layout-hint-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.layout-hint-card.homework {
    border-color: var(--warning);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, rgba(249, 115, 22, 0.05) 100%);
}

.layout-hint-card h4 {
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    margin: 0;
    font-size: 0.95rem;
    color: var(--accent-primary);
    border-bottom: 1px solid var(--border-color);
}

.layout-hint-card.homework h4 {
    color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.hint-content {
    padding: 1rem;
}

.hint-main {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.hint-structure {
    background: rgba(99, 102, 241, 0.1);
    border-left: 3px solid var(--accent-primary);
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.hint-tips {
    list-style: none;
    padding: 0;
    margin: 0;
}

.hint-tips li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hint-tips li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--success);
}

/* ============================================
   Homepage Enhanced Styles
   ============================================ */

/* Hero Glow Effect */
.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* Gradient Text */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Enhanced Hero Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* Stat Cards */
.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.5rem;
    min-width: 70px;
}

.stat-card .stat-number {
    font-size: 1.5rem;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Hero Actions */
.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

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

.hero-btn.secondary:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--accent-primary);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Enhanced Feature Cards */
.feature-icon-wrap {
    width: 60px;
    height: 60px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon-wrap {
    background: var(--accent-gradient);
    transform: scale(1.05);
}

.feature-card.featured {
    border-color: var(--accent-primary);
    position: relative;
}

.feature-card.featured::before {
    content: 'MOST POPULAR';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    letter-spacing: 0.5px;
}

.feature-labs {
    display: inline-block;
    margin-top: 1rem;
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
}

/* Category Cards Enhanced */
.category-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
}

.category-arrow {
    display: inline-block;
    margin-top: 1rem;
    font-size: 1.25rem;
    color: var(--accent-primary);
    transition: transform var(--transition-fast);
}

.category-card:hover .category-arrow {
    transform: translateX(5px);
}

/* Highlights Section */
.highlights {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.03) 50%, transparent 100%);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.highlight-item {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.highlight-item:hover {
    border-color: var(--accent-secondary);
    transform: translateY(-3px);
}

.highlight-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.highlight-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.highlight-item p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* CTA Section */
.cta-section {
    padding: 5rem 2rem;
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 4rem 3rem;
    position: relative;
    overflow: hidden;
}

.cta-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.cta-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.cta-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 60px rgba(99, 102, 241, 0.3);
}

.cta-btn svg {
    transition: transform var(--transition-fast);
}

.cta-btn:hover svg {
    transform: translateX(5px);
}

/* TA Avatar Gradients */
.ta-avatar.gradient-1 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.ta-avatar.gradient-2 {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.ta-avatar.gradient-3 {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

/* Enhanced Footer */
.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-brand .logo-icon {
    font-size: 1.5rem;
}

.footer-faculty {
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */

/* On-Load Animations */
.animate-fade-up {
    animation: fadeUp 0.8s ease-out forwards;
    opacity: 0;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
    opacity: 0;
}

.animate-scale-in {
    animation: scaleIn 0.8s ease-out forwards;
    opacity: 0;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

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

/* Floating Animation for Code Window */
.floating {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }
}

/* Scroll Reveal Animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-reveal.scroll-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delay for cards */
.feature-card.scroll-reveal,
.category-card.scroll-reveal,
.highlight-item.scroll-reveal,
.ta-card.scroll-reveal {
    transition-delay: var(--stagger-delay, 0s);
}

/* Typing Effect for Gradient Text */
.typing-effect {
    position: relative;
}

/* Hero Glow Animation */
.hero-glow {
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {

    0%,
    100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* Button Hover Animations */
.hero-btn.primary:hover {
    transform: translateY(-3px) scale(1.02);
    transition-delay: 0s !important;
}

.hero-btn.secondary:hover {
    transform: translateY(-2px);
    transition-delay: 0s !important;
}

/* Card Hover Animations */
.stat-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
    transition-delay: 0s !important;
}

/* Feature Card Enhanced Hover */
.feature-card {
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    transition-delay: 0s !important;
}

/* Category Card Hover */
.category-card {
    transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.category-card:hover {
    transform: translateY(-5px);
    transition-delay: 0s !important;
}

/* Highlight Item Hover */
.highlight-item {
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.highlight-item:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.15);
    transition-delay: 0s !important;
}

/* CTA Button Animation */
.cta-btn {
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.cta-btn:hover::before {
    left: 100%;
}

/* TA Card Animation */
.ta-card {
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.ta-card:hover {
    transform: translateY(-10px) scale(1.03);
    transition-delay: 0s !important;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0;
    background: var(--bg-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        gap: 3rem;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .hero {
        padding: 5rem 1rem 3rem;
    }

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

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

    .lab-content {
        padding: 1.5rem;
    }

    .lab-nav {
        flex-direction: column;
        align-items: stretch;
    }

    .lab-pagination {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .filter-tabs {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 0.9rem;
        font-size: 0.8rem;
    }

    .lab-header-top {
        flex-direction: column;
        align-items: flex-start;
    }
}

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

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

.lab-card,
.feature-card,
.category-card {
    animation: fadeIn 0.5s ease forwards;
}

.labs-grid .lab-card:nth-child(1) {
    animation-delay: 0.05s;
}

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

.labs-grid .lab-card:nth-child(3) {
    animation-delay: 0.15s;
}

.labs-grid .lab-card:nth-child(4) {
    animation-delay: 0.2s;
}

.labs-grid .lab-card:nth-child(5) {
    animation-delay: 0.25s;
}

.labs-grid .lab-card:nth-child(6) {
    animation-delay: 0.3s;
}

/* Print Styles */
@media print {

    .navbar,
    .lab-nav,
    .footer {
        display: none;
    }

    .lab-content {
        border: none;
        padding: 0;
    }

    body {
        background: white;
        color: black;
    }
}