/**
 * [INPUT]: 依赖 Tailwind 主题令牌、Inter/Work Sans/JetBrains Mono 字体与页面语义类名
 * [OUTPUT]: 对外提供多页面工业 HUD 视觉、导航、卡片、按钮与响应式布局样式
 * [POS]: assets/styles 的共享视觉层，与页面内 Tailwind 工具类共同构成品牌界面
 * [PROTOCOL]: 变更时更新此头部，然后检查 AGENTS.md
 */

:root {
    color-scheme: dark;
    --ink: #e2e2e4;
    --muted: #aeb0b7;
    --gold: #e9c176;
    --steel: #b9c7e4;
    --cyan: #6fd7d6;
    --line: #44474d;
    --surface: #111415;
    --panel: #1a1c1d;
}

html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 104px; }
body { font-family: "Work Sans", sans-serif; }

.site-grid {
    background-image:
        linear-gradient(rgba(185, 199, 228, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(185, 199, 228, 0.035) 1px, transparent 1px);
    background-size: 40px 40px;
}

.site-dots {
    background-image: radial-gradient(circle at 2px 2px, rgba(143, 144, 151, 0.08) 1px, transparent 0);
    background-size: 24px 24px;
}

.scanlines::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.18;
    background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.16) 0, rgba(0, 0, 0, 0.16) 1px, transparent 1px, transparent 3px);
}

.hud-corners { position: relative; }
.hud-corners::before,
.hud-corners::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    pointer-events: none;
}
.hud-corners::before {
    left: -2px;
    bottom: -2px;
    border-left: 2px solid var(--gold);
    border-bottom: 2px solid var(--gold);
}
.hud-corners::after {
    right: -2px;
    top: -2px;
    border-right: 2px solid var(--gold);
    border-top: 2px solid var(--gold);
}

.eyebrow {
    font: 500 12px/16px "JetBrains Mono", monospace;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--gold);
}

.display-title {
    font-family: "Inter", sans-serif;
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 0.98;
}

.industrial-card {
    position: relative;
    border: 1px solid rgba(143, 144, 151, 0.28);
    background: rgba(26, 28, 29, 0.88);
    transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}
.industrial-card:hover {
    transform: translateY(-3px);
    border-color: rgba(233, 193, 118, 0.75);
    background: rgba(30, 32, 33, 0.96);
}

.signal-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font: 500 13px/20px "JetBrains Mono", monospace;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}
.signal-link:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 4px;
}

.nav-link {
    position: relative;
    color: var(--muted);
    transition: color 160ms ease;
}
.nav-link:hover,
.nav-link[aria-current="page"] { color: var(--gold); }
.nav-link[aria-current="page"]::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -10px;
    height: 2px;
    background: var(--gold);
}

.metric-number {
    font-family: "JetBrains Mono", monospace;
    font-variant-numeric: tabular-nums;
}

.quote-mark {
    font: 700 80px/0.7 Georgia, serif;
    color: rgba(233, 193, 118, 0.2);
}

@media (max-width: 767px) {
    .nav-link[aria-current="page"]::after { display: none; }
    .display-title { line-height: 1.04; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}