:root {
    --bg-dark: #0a0a0a;
    --bg-panel: #141414;
    --primary: #00e5ff; /* 科技蓝/青 */
    --accent: #ff3366;  /* 警示红/强调色 */
    --text-main: #e0e0e0;
    --text-muted: #808080;
    --border: #333333;
    --metal-gradient: linear-gradient(135deg, #444 0%, #222 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Exo 2', sans-serif;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Nav */
.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 2px;
    color: #fff;
}

.highlight { color: var(--primary); }

.nav-content nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 30px;
    font-size: 14px;
    font-weight: 500;
    transition: 0.3s;
}

.nav-content nav a:hover { color: var(--primary); }

.btn-sm {
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 4px;
    color: var(--text-main);
    text-decoration: none;
    transition: all 0.3s;
}
.btn-sm:hover { border-color: var(--primary); color: var(--primary); }

/* Hero */
.hero {
    position: relative;
    padding: 160px 0 100px;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 75% 40%, #1a202c 0%, #0a0a0a 60%);
}

.grid-lines {
    position: absolute;
    width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.tag {
    color: var(--primary);
    font-family: 'Roboto Mono', monospace;
    font-size: 12px;
    border: 1px solid rgba(0, 229, 255, 0.3);
    background: rgba(0, 229, 255, 0.05);
    padding: 6px 10px;
    border-radius: 2px;
    display: inline-block;
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 56px;
    line-height: 1;
    margin-bottom: 16px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -1px;
}

.slogan {
    font-size: 28px;
    font-weight: 300;
    color: #ccc;
    margin-bottom: 20px;
}

.description {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 500px;
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-specs {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
}

.spec-item { display: flex; flex-direction: column; }
.spec-item .val { font-size: 24px; font-weight: 700; color: var(--text-main); font-family: 'Roboto Mono', monospace; }
.spec-item .lbl { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.cta-buttons { display: flex; gap: 20px; align-items: center; }

.btn-primary {
    background: var(--primary);
    color: #000;
    text-decoration: none;
    padding: 12px 30px;
    font-weight: 700;
    border-radius: 2px;
    transition: 0.3s;
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
}

.btn-primary:hover {
    background: #fff;
    box-shadow: 0 0 25px rgba(0, 229, 255, 0.5);
    transform: translateY(-2px);
}

.btn-text {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
}

/* Industrial Box Model (CSS Art) */
.hero-model {
    display: flex;
    justify-content: center;
    perspective: 1200px;
}

.industrial-box {
    width: 320px; /* 约 64mm */
    height: 235px; /* 约 47mm */
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(25deg) rotateY(-35deg);
    transition: transform 0.5s ease;
}

.industrial-box:hover {
    transform: rotateX(20deg) rotateY(-30deg) scale(1.02);
}

.box-face {
    position: absolute;
    backface-visibility: hidden;
    border: 1px solid rgba(255,255,255,0.1);
}

.box-face.front {
    width: 320px; height: 235px;
    background: linear-gradient(135deg, #3a3a3a 0%, #1a1a1a 100%);
    /* 金属拉丝质感 */
    background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 4px);
    transform: translateZ(88px); /* 深度的一半, 假设厚度176px (35mm -> 176px scale)  */
    /* 实际上我们按比例算：64.8 : 47 : 35.3 -> 320 : 232 : 174 */
    transform: translateZ(87px);
    border-radius: 4px;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.8);
}

.box-face.side {
    width: 174px; height: 235px;
    background: #222;
    transform: rotateY(90deg) translateZ(160px);
    border-radius: 2px;
}

.box-face.top {
    width: 320px; height: 174px;
    background: #2a2a2a;
    transform: rotateX(90deg) translateZ(117px);
    border-radius: 2px;
}

/* Screws */
.screw {
    width: 12px; height: 12px;
    background: radial-gradient(circle at 30% 30%, #bbb, #555);
    border-radius: 50%;
    position: absolute;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}
.screw::after {
    content: ''; position: absolute; top: 50%; left: 50%;
    width: 8px; height: 2px; background: #333;
    transform: translate(-50%, -50%) rotate(45deg);
}
.screw::before {
    content: ''; position: absolute; top: 50%; left: 50%;
    width: 2px; height: 8px; background: #333;
    transform: translate(-50%, -50%) rotate(45deg);
}

.tl { top: 15px; left: 15px; }
.tr { top: 15px; right: 15px; }
.bl { bottom: 15px; left: 15px; }
.br { bottom: 15px; right: 15px; }

.label-plate {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -80%);
    text-align: center;
    border: 1px solid #555;
    padding: 10px 20px;
    background: #111;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.label-plate .brand {
    display: block;
    font-family: 'Exo 2', sans-serif;
    font-weight: 700;
    font-size: 24px;
    color: #fff;
    letter-spacing: 1px;
}

.label-plate .sn {
    display: block;
    font-family: 'Roboto Mono', monospace;
    font-size: 10px;
    color: #666;
    margin-top: 5px;
}

.connector-port {
    position: absolute;
    bottom: 30px; left: 50%;
    transform: translateX(-50%);
    width: 180px; height: 40px;
    background: #000;
    border: 1px solid #444;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.connector-port span { font-size: 8px; color: #555; margin-bottom: 2px; }
.connector-port .pins {
    width: 160px; height: 10px;
    background: repeating-linear-gradient(90deg, #d4af37 0, #d4af37 2px, #000 2px, #000 6px);
}

.axis-mark {
    position: absolute;
    top: 20px; right: 20px;
    color: #666;
    font-family: monospace;
    font-size: 12px;
}
.axis-mark span { display: block; }

/* Features */
.features { padding: 100px 0; background: var(--bg-panel); }
.section-title { margin-bottom: 60px; text-align: center; }
.section-title h2 { font-size: 36px; color: #fff; }

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: #1a1a1a;
    padding: 40px;
    border: 1px solid #2a2a2a;
    transition: 0.3s;
    position: relative;
    overflow: hidden;
}

.card:hover { border-color: var(--primary); transform: translateY(-5px); }
.card:hover .card-icon { transform: scale(1.1); }

.card-icon { font-size: 32px; margin-bottom: 20px; transition: 0.3s; }
.card h3 { font-size: 20px; margin-bottom: 15px; color: #fff; }
.card p { color: var(--text-muted); font-size: 14px; line-height: 1.6; }

/* Specs */
.specs { padding: 100px 0; }
.specs-layout { display: grid; grid-template-columns: 3fr 2fr; gap: 60px; }

.specs h2 { margin-bottom: 40px; font-size: 32px; color: #fff; }

.data-table { width: 100%; border-collapse: collapse; font-family: 'Roboto Mono', monospace; font-size: 14px; }
.data-table th { text-align: left; padding: 15px; border-bottom: 1px solid #333; color: var(--text-muted); font-size: 12px; text-transform: uppercase; }
.data-table td { padding: 12px 15px; border-bottom: 1px solid #222; color: var(--text-main); }
.table-header { background: #1a1a1a; color: var(--primary) !important; font-weight: 700; font-size: 12px; letter-spacing: 1px; }

.chart-box {
    background: var(--bg-panel);
    padding: 40px;
    border-radius: 4px;
    border: 1px solid #2a2a2a;
    height: 100%;
    position: sticky;
    top: 100px;
}

.chart-title { margin-bottom: 30px; font-weight: 700; color: #fff; font-size: 18px; border-bottom: 2px solid var(--primary); display: inline-block; padding-bottom: 5px; }

.app-list { list-style: none; }
.app-list li {
    padding: 15px 0;
    border-bottom: 1px dashed #333;
    color: var(--text-muted);
    font-size: 14px;
    display: flex;
    align-items: center;
}
.app-list li strong { color: #fff; margin-right: 10px; min-width: 80px; }

/* Footer */
.footer-cta { padding: 100px 0; text-align: center; background: linear-gradient(to top, #0f1216, #0a0a0a); border-top: 1px solid #222; }
.footer-cta h2 { font-size: 36px; margin-bottom: 20px; color: #fff; }
.footer-cta p { color: var(--text-muted); margin-bottom: 40px; }

footer { padding: 40px 0; border-top: 1px solid #222; font-size: 12px; color: #555; text-align: center; background: #050505; }

@media (max-width: 900px) {
    .hero-body { grid-template-columns: 1fr; text-align: center; }
    .hero-specs { justify-content: center; }
    .cta-buttons { justify-content: center; }
    .industrial-box { margin: 60px auto 0; }
    .specs-layout { grid-template-columns: 1fr; }
    .chart-box { position: static; margin-top: 40px; }
    .nav-content nav { display: none; } 
}