:root {
    --obsidian-black: #0D0D0D;
    --rose-gold: #B76E79;
    --brushed-steel: #848482;
    --clean-white: #F5F5F5;
    --accent-gold: #D4AF37;
}

body {
    background-color: var(--obsidian-black);
    color: var(--clean-white);
    font-family: 'Playfair Display', serif; /* 傳統襯線體 */
    line-height: 1.6;
    overflow-x: hidden;
}

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

.tech-font {
    font-family: 'JetBrains Mono', monospace; /* 技術感等寬字體 */
}

.navbar {
    background-color: rgba(13, 13, 13, 0.95);
    border-bottom: 1px solid var(--brushed-steel);
    padding: 1rem 2rem;
}

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

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

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

.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at center, #1a1a1a 0%, #0d0d0d 100%);
}

.card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--brushed-steel);
    color: var(--clean-white);
    transition: transform 0.3s, border-color 0.3s;
}

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

.btn-primary {
    background-color: var(--rose-gold);
    border: none;
    color: var(--obsidian-black);
    font-weight: bold;
    padding: 10px 30px;
    border-radius: 0;
}

.btn-primary:hover {
    background-color: var(--accent-gold);
}

footer {
    padding: 4rem 0;
    border-top: 1px solid var(--brushed-steel);
    margin-top: 4rem;
}

/* 機械齒輪動畫背景 */
.gear-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.1;
    pointer-events: none;
}

.section-title {
    border-left: 4px solid var(--rose-gold);
    padding-left: 1rem;
    margin-bottom: 2rem;
}

.tech-data {
    font-size: 0.9rem;
    color: var(--brushed-steel);
}