/* ============================================
   ClassCyber — Futuristic C++ Course Landing
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    --primary: #00f0ff;
    --primary-dim: #00a8b3;
    --secondary: #ff00ff;
    --accent: #8b5cf6;
    --accent-light: #a78bfa;
    --success: #10b981;
    --warning: #f59e0b;
    --bg-deep: #04060f;
    --bg-dark: #0a0e1a;
    --bg-card: rgba(12, 16, 32, 0.75);
    --bg-card-hover: rgba(20, 28, 55, 0.85);
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --text-bright: #f8fafc;
    --border: rgba(0, 240, 255, 0.12);
    --border-hover: rgba(0, 240, 255, 0.3);
    --glow: 0 0 20px rgba(0, 240, 255, 0.15);
    --glow-strong: 0 0 40px rgba(0, 240, 255, 0.25), 0 0 80px rgba(0, 240, 255, 0.1);
    --glass: rgba(255, 255, 255, 0.03);
    --radius: 16px;
    --radius-sm: 8px;
    --radius-xs: 4px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Space Grotesk', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-dim) var(--bg-dark);
}

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary-dim); border-radius: 3px; }

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--text-bright); }

::selection {
    background: rgba(0, 240, 255, 0.25);
    color: var(--text-bright);
}

/* ---------- Particle Canvas ---------- */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ---------- Scanlines Overlay ---------- */
.scanlines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.03) 2px,
        rgba(0, 0, 0, 0.03) 4px
    );
}

/* ---------- Container ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Glass Card ---------- */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: var(--transition);
}

.glass-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    box-shadow: var(--glow);
    transform: translateY(-2px);
}

/* ---------- Section Common ---------- */
.section {
    position: relative;
    z-index: 2;
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--primary);
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.2);
    padding: 6px 20px;
    border-radius: 100px;
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--text-bright);
    line-height: 1.2;
    margin-bottom: 16px;
}

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

/* ---------- Reveal Animations ---------- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal:nth-child(5) { transition-delay: 0.4s; }
.reveal:nth-child(6) { transition-delay: 0.5s; }

/* ==========================================
   NAVBAR
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(4, 6, 15, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-bright);
}

.nav-logo:hover { color: var(--text-bright); }

.logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.3));
}

.logo-text .accent {
    color: var(--primary);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dim);
    letter-spacing: 0.02em;
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
    border-radius: 1px;
}

.nav-links a:hover { color: var(--text-bright); }
.nav-links a:hover::after { width: 100%; }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.2);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.05em;
}

.lang-toggle:hover {
    background: rgba(0, 240, 255, 0.15);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.lang-globe { font-size: 1rem; line-height: 1; }

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(4, 6, 15, 0.97);
    backdrop-filter: blur(20px);
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.mobile-menu.open {
    opacity: 1;
    visibility: visible;
}

.mobile-links {
    list-style: none;
    text-align: center;
}

.mobile-links li { margin: 20px 0; }

.mobile-links a {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--text);
    letter-spacing: 0.05em;
}

.mobile-links a:hover { color: var(--primary); }

/* ==========================================
   HERO
   ========================================== */
.hero {
    position: relative;
    z-index: 2;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg-images {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg-img {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    animation: heroFade 18s infinite;
}

.hero-bg-img:nth-child(1) { animation-delay: 0s; }
.hero-bg-img:nth-child(2) { animation-delay: 6s; }
.hero-bg-img:nth-child(3) { animation-delay: 12s; }

@keyframes heroFade {
    0%, 28% { opacity: 0; }
    33%, 61% { opacity: 0.15; }
    66%, 100% { opacity: 0; }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(0, 240, 255, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 30%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(255, 0, 255, 0.04) 0%, transparent 50%),
        linear-gradient(180deg, rgba(4, 6, 15, 0.3) 0%, rgba(4, 6, 15, 0.8) 60%, var(--bg-deep) 100%);
}

.hero-grid-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 900px;
}

/* Hero Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--success);
    margin-bottom: 32px;
    animation: badgePulse 3s ease-in-out infinite;
}

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

@keyframes dotPulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
}

@keyframes badgePulse {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

/* Hero Title */
.hero-title {
    font-family: var(--font-display);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--text-bright);
}

.title-accent {
    font-size: clamp(4rem, 12vw, 8rem);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 30px rgba(0, 240, 255, 0.3));
    animation: gradientShift 6s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-dim);
    max-width: 650px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    margin-bottom: 48px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, transparent, var(--border-hover), transparent);
}

/* Hero Actions */
.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--bg-deep);
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(0, 240, 255, 0.4);
    color: var(--bg-deep);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-hover);
}

.btn-ghost:hover {
    background: rgba(0, 240, 255, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    animation: scrollBounce 2s ease-in-out infinite;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid rgba(0, 240, 255, 0.3);
    border-radius: 13px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: wheelScroll 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

@keyframes wheelScroll {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0.3; top: 20px; }
}

/* ==========================================
   ABOUT
   ========================================== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.about-card {
    padding: 32px;
    text-align: center;
}

.about-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.2));
}

.about-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 12px;
}

.about-card p {
    font-size: 0.95rem;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ==========================================
   CURRICULUM
   ========================================== */
.curriculum-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.curriculum-timeline::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--accent), var(--secondary));
    opacity: 0.3;
}

.timeline-item {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    position: relative;
}

.timeline-marker {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 2px solid var(--primary-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
}

.marker-number {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
}

.timeline-content {
    flex: 1;
    padding: 28px;
}

.module-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.module-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 12px;
    border-radius: 100px;
}

.module-status {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 100px;
    letter-spacing: 0.03em;
}

.module-status.done {
    color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.module-status.upcoming {
    color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-dim);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.module-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.topic-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary);
    background: rgba(0, 240, 255, 0.06);
    border: 1px solid rgba(0, 240, 255, 0.15);
    padding: 4px 10px;
    border-radius: var(--radius-xs);
}

/* Progress */
.progress-section {
    max-width: 800px;
    margin: 48px auto 0;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--text);
}

.progress-percent {
    color: var(--primary);
    font-weight: 700;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
    border-radius: 4px;
    transition: width 1.5s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.progress-note {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* ==========================================
   FEATURES
   ========================================== */
.features {
    background:
        radial-gradient(ellipse at 20% 50%, rgba(139, 92, 246, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(0, 240, 255, 0.04) 0%, transparent 50%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.feature-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(0, 240, 255, 0.06);
    border: 1px solid rgba(0, 240, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover .feature-icon-wrap {
    background: rgba(0, 240, 255, 0.12);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
    transform: scale(1.05);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ==========================================
   CODE PREVIEW
   ========================================== */
.code-preview {
    background:
        radial-gradient(ellipse at 50% 0%, rgba(0, 240, 255, 0.03) 0%, transparent 50%);
}

.code-preview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.code-window {
    background: #0d1117;
    border-radius: var(--radius);
    border: 1px solid rgba(0, 240, 255, 0.1);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.code-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.code-filename {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-dim);
}

.code-content {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    overflow-x: auto;
    color: #c9d1d9;
}

.code-content .kw { color: #ff7b72; }
.code-content .str { color: #a5d6ff; }
.code-content .type { color: #7ee787; }
.code-content .fn { color: #d2a8ff; }
.code-content .op { color: #79c0ff; }
.code-content .num { color: #ffa657; }
.code-content .cmt { color: #8b949e; font-style: italic; }

.code-description h2 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 16px;
    line-height: 1.3;
}

.code-description p {
    color: var(--text-dim);
    font-size: 1.05rem;
    margin-bottom: 24px;
    line-height: 1.7;
}

.code-features {
    list-style: none;
}

.code-features li {
    padding: 8px 0;
    color: var(--text);
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

/* ==========================================
   GALLERY
   ========================================== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    border: 1px solid var(--border);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                filter 0.4s ease;
    filter: saturate(0.8) brightness(0.85);
}

.gallery-item:hover img {
    transform: scale(1.08);
    filter: saturate(1.1) brightness(1);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, rgba(4, 6, 15, 0.9) 0%, transparent 50%);
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-overlay { opacity: 1; }

.gallery-overlay span {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--primary);
}

/* ==========================================
   SCHEDULE
   ========================================== */
.schedule-card {
    display: flex;
    align-items: center;
    gap: 40px;
    padding: 48px;
    max-width: 800px;
    margin: 0 auto;
}

.schedule-icon {
    font-size: 4rem;
    flex-shrink: 0;
    filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.2));
}

.schedule-info { flex: 1; }

.schedule-info h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 24px;
}

.schedule-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.schedule-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
}

.detail-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
}

/* ==========================================
   CONTACT
   ========================================== */
.contact {
    background:
        radial-gradient(ellipse at 50% 100%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    padding: 48px 32px;
    text-align: center;
}

.contact-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(0, 240, 255, 0.06);
    border: 2px solid rgba(0, 240, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.1);
}

.contact-avatar img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.contact-card h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 8px;
}

.contact-role {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 24px;
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--primary);
    background: rgba(0, 240, 255, 0.06);
    border: 1px solid rgba(0, 240, 255, 0.2);
    padding: 12px 24px;
    border-radius: 100px;
    transition: var(--transition);
}

.contact-email:hover {
    background: rgba(0, 240, 255, 0.12);
    box-shadow: var(--glow);
    color: var(--text-bright);
}

.contact-email svg {
    flex-shrink: 0;
}

.contact-info-card {
    padding: 48px 32px;
}

.contact-info-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 32px;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.step-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--bg-deep);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step p {
    color: var(--text);
    font-size: 0.95rem;
    padding-top: 4px;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    position: relative;
    z-index: 2;
    padding: 48px 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-bright);
}

.footer-logo {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.footer-tech {
    font-size: 0.75rem;
    color: rgba(148, 163, 184, 0.5);
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }

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

    .code-preview-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .schedule-card {
        flex-direction: column;
        text-align: center;
        padding: 32px;
    }

    .schedule-details {
        grid-template-columns: repeat(2, 1fr);
        text-align: left;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .curriculum-timeline::before { left: 20px; }

    .timeline-marker {
        width: 40px;
        height: 40px;
    }

    .marker-number { font-size: 0.8rem; }

    .timeline-content { padding: 20px; }
}

@media (max-width: 480px) {
    .section { padding: 60px 0; }
    .gallery-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .stat-divider { width: 40px; height: 1px; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}

/* ==========================================
   LIGHTBOX
   ========================================== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    cursor: pointer;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: 0 0 80px rgba(0, 240, 255, 0.1);
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ==========================================
   NEON BORDER ANIMATION (feature cards)
   ========================================== */
@keyframes neonBorderRotate {
    0% { --angle: 0deg; }
    100% { --angle: 360deg; }
}

/* ==========================================
   TYPING CURSOR BLINK
   ========================================== */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}