:root {
    --primary-blue: #1A237E; /* 主軸靜壓藍 */
    --spark-gold: #FFD600;   /* 磨削火花金 */
    --coolant-teal: #26A69A; /* 冷卻液翠青 */
    --cast-gray: #424242;    /* 鑄件穩定灰 */
    --bg-dark: #0a0a0c;
    --text-light: #e0e0e0;
    --border-silver: #c0c0c0;
}

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

.mono-font {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Navbar Styling */
.navbar {
    background-color: rgba(26, 35, 126, 0.95);
    border-bottom: 1px solid var(--spark-gold);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--spark-gold) !important;
}

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

.nav-link:hover {
    color: var(--spark-gold) !important;
}

/* Global Elements */
.section-title {
    border-left: 4px solid var(--spark-gold);
    padding-left: 1rem;
    margin-bottom: 2rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card-precision {
    background: rgba(66, 66, 66, 0.2);
    border: 1px solid rgba(192, 192, 192, 0.2);
    border-radius: 0;
    transition: 0.4s;
}

.card-precision:hover {
    border-color: var(--spark-gold);
    background: rgba(26, 35, 126, 0.1);
}

.footer {
    background: #050505;
    border-top: 1px solid var(--cast-gray);
    padding: 3rem 0;
    font-size: 0.9rem;
}

/* Animations */
@keyframes spark-flicker {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

.spark-glow {
    box-shadow: 0 0 15px var(--spark-gold);
    animation: spark-flicker 2s infinite;
}