:root {
    --bg-dark: #030504;
    --primary-green: #00FF88;
    --titanium-gray: #E2E8F0;
    --alert-orange: #FF6600;
    --text-muted: #A0AEC0;
}

body {
    background-color: var(--bg-dark);
    color: var(--titanium-gray);
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    overflow-x: hidden;
}

.navbar {
    background-color: rgba(3, 5, 4, 0.95);
    border-bottom: 1px solid rgba(0, 255, 136, 0.2);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    color: var(--primary-green) !important;
    font-weight: 800;
    letter-spacing: 1px;
}

.nav-link {
    color: var(--titanium-gray) !important;
    font-size: 0.9rem;
    text-transform: uppercase;
    margin: 0 10px;
    transition: color 0.3s;
}

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

.hero-section {
    padding: 100px 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
}

.text-primary-green { color: var(--primary-green); }
.text-titanium { color: var(--titanium-gray); }
.text-alert { color: var(--alert-orange); }

.btn-outline-green {
    border: 1px solid var(--primary-green);
    color: var(--primary-green);
    transition: all 0.3s;
}

.btn-outline-green:hover {
    background-color: var(--primary-green);
    color: var(--bg-dark);
}

.card-custom {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(226, 232, 240, 0.1);
    border-radius: 0;
    transition: transform 0.3s, border-color 0.3s;
}

.card-custom:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
}

.stats-counter {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-green);
}

footer {
    padding: 50px 0;
    border-top: 1px solid rgba(226, 232, 240, 0.1);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Matrix & Grid Styles */
.matrix-bg {
    background-image: linear-gradient(rgba(0, 255, 136, 0.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(0, 255, 136, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* Math Styles */
.math-container {
    padding: 20px;
    background: rgba(0, 255, 136, 0.05);
    border-left: 4px solid var(--primary-green);
    margin: 20px 0;
}