:root {
    --obsidian-black: #010503;
    --microfluidic-white: #F4F9F6;
    --health-emerald: #2CC780;
    --epidemic-crimson: #FF453A;
    --dark-gray: #1a1a1a;
    --accent-glow: rgba(44, 199, 128, 0.2);
}

body {
    background-color: var(--obsidian-black);
    color: var(--microfluidic-white);
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    overflow-x: hidden;
}

.navbar {
    background-color: rgba(1, 5, 3, 0.95);
    border-bottom: 1px solid rgba(244, 249, 246, 0.1);
    backdrop-filter: blur(10px);
}

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

.nav-link {
    color: var(--microfluidic-white) !important;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin: 0 10px;
    transition: color 0.3s ease;
}

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

.hero-section {
    padding: 150px 0 100px;
    position: relative;
}

.section-title {
    color: var(--health-emerald);
    font-weight: 700;
    margin-bottom: 30px;
    border-left: 4px solid var(--health-emerald);
    padding-left: 15px;
}

.card {
    background: rgba(26, 26, 26, 0.5);
    border: 1px solid rgba(244, 249, 246, 0.1);
    color: var(--microfluidic-white);
    transition: all 0.3s ease;
}

.card:hover {
    border-color: var(--health-emerald);
    transform: translateY(-5px);
}

.footer {
    padding: 50px 0;
    background-color: #000;
    border-top: 1px solid rgba(244, 249, 246, 0.1);
}

.btn-outline-emerald {
    border: 1px solid var(--health-emerald);
    color: var(--health-emerald);
}

.btn-outline-emerald:hover {
    background-color: var(--health-emerald);
    color: var(--obsidian-black);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--obsidian-black);
}
::-webkit-scrollbar-thumb {
    background: var(--dark-gray);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--health-emerald);
}

/* Math Display */
math {
    font-size: 1.2rem;
    color: var(--health-emerald);
}