:root {
    --alloy-gray: #454545;
    --warning-red: #E63946;
    --flow-blue: #A8DADC;
    --smart-green: #2A9D8F;
    --dark-metal: #1a1a1a;
    --light-metal: #d1d1d1;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body {
    background-color: var(--dark-metal);
    color: var(--light-metal);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #ffffff;
}

.navbar {
    background-color: rgba(26, 26, 26, 0.95);
    border-bottom: 2px solid var(--alloy-gray);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 900;
    color: var(--warning-red) !important;
    letter-spacing: 2px;
}

.nav-link {
    color: var(--light-metal) !important;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

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

.btn-primary {
    background-color: var(--warning-red);
    border: none;
    border-radius: 0;
    font-weight: 700;
    padding: 10px 25px;
    text-transform: uppercase;
}

.btn-outline-primary {
    color: var(--flow-blue);
    border-color: var(--flow-blue);
    border-radius: 0;
}

.card {
    background-color: var(--alloy-gray);
    border: 1px solid #555;
    border-radius: 0;
    color: #fff;
}

.section-title {
    border-left: 5px solid var(--warning-red);
    padding-left: 15px;
    margin-bottom: 30px;
}

.tech-data {
    font-family: var(--font-mono);
    color: var(--flow-blue);
}

footer {
    background-color: #000;
    padding: 50px 0;
    border-top: 5px solid var(--alloy-gray);
}

/* 工業質感背景 */
.industrial-bg {
    background-image: radial-gradient(circle at 2px 2px, rgba(255,255,255,0.05) 1px, transparent 0);
    background-size: 40px 40px;
}

/* 壓力梯度流光效果 */
@keyframes flow-glow {
    0% { box-shadow: 0 0 5px var(--flow-blue); }
    50% { box-shadow: 0 0 20px var(--flow-blue); }
    100% { box-shadow: 0 0 5px var(--flow-blue); }
}

.flow-active {
    animation: flow-glow 2s infinite;
}