:root {
    --bg-dark: #010304;
    --primary-blue: #00D2FF;
    --accent-platinum: #F1F5F9;
    --danger-red: #FF3B30;
    --text-muted: #8E8E93;
    --card-bg: rgba(255, 255, 255, 0.03);
    --border-color: rgba(255, 255, 255, 0.1);
}

body {
    background-color: var(--bg-dark);
    color: var(--accent-platinum);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.text-primary-blue { color: var(--primary-blue); }
.text-danger-red { color: var(--danger-red); }

.navbar {
    background: rgba(1, 3, 4, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
}

.navbar-brand {
    font-weight: 900;
    font-size: 1.2rem;
    color: var(--accent-platinum) !important;
}

.nav-link {
    color: var(--text-muted) !important;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-blue) !important;
}

.hero-section {
    padding: 120px 0;
    position: relative;
}

.card-custom {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s ease;
}

.card-custom:hover {
    border-color: var(--primary-blue);
    background: rgba(0, 210, 255, 0.02);
}

.footer {
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
    margin-top: 100px;
}

.footer h5 {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.footer p, .footer li {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stat-number {
    font-family: 'JetBrains Mono', monospace;
    color: var(--primary-blue);
    font-size: 2.5rem;
    font-weight: 700;
}

.math-formula {
    background: rgba(255, 255, 255, 0.02);
    padding: 2rem;
    border-left: 4px solid var(--primary-blue);
    margin: 2rem 0;
    font-family: 'Times New Roman', serif;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-color); }
::-webkit-scrollbar-thumb:hover { background: var(--primary-blue); }