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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #1a1f3a;
    --accent-cyan: #00fff5;
    --accent-green: #00ff88;
    --accent-purple: #b967ff;
    --text-primary: #e0e6ed;
    --text-secondary: #94a3b8;
    --terminal-bg: #0d1117;
}

body {
    font-family: 'Courier New', Monaco, 'Consolas', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Binary Rain Background */
#matrix-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.15;
}

/* Header */
header {
    padding: 2rem 5%;
    background: linear-gradient(135deg, rgba(0, 255, 245, 0.1) 0%, rgba(185, 103, 255, 0.1) 100%);
    border-bottom: 2px solid var(--accent-cyan);
    box-shadow: 0 0 30px rgba(0, 255, 245, 0.3);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    font-size: 2.5rem;
    color: var(--accent-cyan);
    text-shadow: 0 0 10px var(--accent-cyan), 0 0 20px var(--accent-cyan);
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 5%;
}

/* Terminal Section */
.terminal {
    background: var(--terminal-bg);
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #30363d;
}

.terminal-dots {
    display: flex;
    gap: 8px;
    margin-right: 1rem;
}

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

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27ca40; }

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

.code-block {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.code-line {
    display: block;
    margin-bottom: 0.25rem;
}

.prompt {
    color: var(--accent-green);
    margin-right: 0.5rem;
}

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

.keyword {
    color: var(--accent-purple);
}

.string {
    color: var(--accent-cyan);
}

.code-link {
    color: var(--accent-cyan);
    text-decoration: none;
    border-bottom: 1px dotted var(--accent-cyan);
}

.code-link:hover {
    color: var(--accent-green);
    border-bottom-style: solid;
}

/* Lectures Grid */
.lectures-section {
    margin: 3rem 0;
}

.section-title {
    font-size: 1.8rem;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    border-left: 4px solid var(--accent-green);
    padding-left: 1rem;
}

.lectures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lecture-card {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-cyan);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.lecture-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 245, 0.1), transparent);
    transition: left 0.5s ease;
}

.lecture-card:hover::before {
    left: 100%;
}

.lecture-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 245, 0.3);
    border-color: var(--accent-green);
}

.lecture-number {
    display: inline-block;
    background: var(--accent-cyan);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}

.lecture-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.lecture-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.lecture-link {
    display: inline-block;
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.lecture-link:hover {
    color: var(--accent-green);
}

.lecture-link::after {
    content: ' \2192';
    transition: transform 0.3s ease;
}

.lecture-link:hover::after {
    transform: translateX(5px);
}

/* Stats Section */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0;
}

.stat-card {
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent-purple);
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    color: var(--accent-cyan);
    font-weight: bold;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 10px var(--accent-cyan);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--accent-cyan);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-link {
    color: var(--accent-cyan);
    text-decoration: none;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

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

    .section-title {
        font-size: 1.4rem;
    }

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

/* Glowing effect */
@keyframes glow {
    0%, 100% { text-shadow: 0 0 10px var(--accent-cyan), 0 0 20px var(--accent-cyan); }
    50% { text-shadow: 0 0 20px var(--accent-cyan), 0 0 40px var(--accent-cyan); }
}

.glow {
    animation: glow 2s ease-in-out infinite;
}