:root {
    --graphite-black: #212121;
    --brass-gold: #B8860B;
    --leather-brown: #5D4037;
    --laser-blue: #0277BD;
    --text-light: #E0E0E0;
    --text-muted: #9E9E9E;
    --border-color: rgba(184, 134, 11, 0.3);
}

body {
    background-color: var(--graphite-black);
    color: var(--text-light);
    font-family: 'Playfair Display', serif; /* 傳統工藝感 */
    line-height: 1.6;
    overflow-x: hidden;
}

.mono-font {
    font-family: 'JetBrains Mono', 'Courier New', monospace; /* 精密數據感 */
}

h1, h2, h3, h4, h5, h6 {
    color: var(--brass-gold);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.navbar {
    background-color: rgba(33, 33, 33, 0.95);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
}

.navbar-brand {
    color: var(--brass-gold) !important;
    font-weight: bold;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--text-light) !important;
    margin: 0 10px;
    transition: color 0.3s;
}

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

.btn-brass {
    background-color: transparent;
    border: 1px solid var(--brass-gold);
    color: var(--brass-gold);
    border-radius: 0;
    padding: 10px 25px;
    transition: all 0.3s;
}

.btn-brass:hover {
    background-color: var(--brass-gold);
    color: var(--graphite-black);
}

/* 工業紋理背景 */
.bg-blueprint {
    background-image: 
        linear-gradient(rgba(33, 33, 33, 0.9), rgba(33, 33, 33, 0.9)),
        radial-gradient(circle at 2px 2px, rgba(184, 134, 11, 0.1) 1px, transparent 0);
    background-size: 100% 100%, 30px 30px;
}

.section-padding {
    padding: 80px 0;
}

.card-industrial {
    background: rgba(45, 45, 45, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 0;
    padding: 20px;
    transition: transform 0.3s;
}

.card-industrial:hover {
    transform: translateY(-5px);
    border-color: var(--brass-gold);
}

footer {
    background-color: #1a1a1a;
    border-top: 1px solid var(--border-color);
    padding: 50px 0 20px;
}

.footer-logo {
    color: var(--brass-gold);
    font-size: 1.2rem;
    font-weight: bold;
}

.spec-label {
    color: var(--laser-blue);
    font-size: 0.8rem;
    text-transform: uppercase;
}

/* 動畫效果 */
@keyframes scanline {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--laser-blue);
    box-shadow: 0 0 10px var(--laser-blue);
    animation: scanline 4s linear infinite;
    z-index: 10;
}