/* ============================================================
   TEMPLATE 13 — Vulcan Amber
   钢铁工业深灰+琥珀警示,机器人/硬件评测氛围。
   字体:Rajdhani(display)+ Inter(body)。
   适用:机器人 / 硬件 / 性能基准 niche。
   ============================================================ */

:root {
  --bg: #0c0e11;
  --panel: #12151a;
  --panel-2: #171b21;
  --line: #262c35;
  --line-bright: #3a424e;
  --ink: #eceef1;
  --muted: #9aa3ae;
  --faint: #6e7783;
  --amber: #f59e0b;
  --amber-deep: #b45309;
  --amber-soft: rgba(245, 158, 11, 0.1);
  --steel: #64748b;
  --font-head: "Rajdhani", "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Rajdhani", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-padding-top: 80px; }
body { font-family: var(--font-body); background: var(--bg); color: var(--ink); line-height: 1.66; font-size: 16.5px; -webkit-font-smoothing: antialiased; }
a { color: var(--amber); text-decoration: none; }
a:hover { color: #fbbf24; }
h1, h2, h3 { font-family: var(--font-head); font-weight: 700; line-height: 1.12; letter-spacing: 0.02em; text-transform: uppercase; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); }
h2 { font-size: 1.7rem; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }

/* ---------- 顶栏:警示条纹底边 ---------- */
.topbar { border-bottom: 1px solid var(--line); background: var(--panel); position: relative; }
.topbar::after {
  content: ""; display: block; height: 4px;
  background: repeating-linear-gradient(-45deg, var(--amber) 0 12px, var(--bg) 12px 24px);
  opacity: 0.55;
}
.topbar-inner { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; }
.brand { font-family: var(--font-head); font-weight: 700; font-size: 1.3rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink); }
.brand b { color: var(--amber); }
.topnav { display: flex; gap: 24px; font-family: var(--font-head); font-weight: 600; font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.1em; }
.topnav a { color: var(--muted); }
.topnav a:hover { color: var(--amber); }
@media (max-width: 720px) { .topnav { display: none; } }

/* ---------- Hero:铭牌面板 ---------- */
.hero { padding: 56px 0 48px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, rgba(245,158,11,0.04), transparent 40%); }
.plate { border: 1px solid var(--line-bright); background: var(--panel); padding: 36px 40px; position: relative; }
.plate::before { content: "UNIT: RANKING-2026 · SPEC: PUBLIC"; position: absolute; top: -10px; left: 24px;
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.16em; color: var(--faint); background: var(--bg); padding: 0 10px; }
.hero h1 .amp { color: var(--amber); }
.hero .lede { color: var(--muted); max-width: 62ch; font-size: 1.08rem; margin-top: 14px; }
.gauges { margin-top: 24px; display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.gauge { background: var(--panel-2); padding: 14px 18px; }
.gauge .g-k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); }
.gauge .g-v { font-family: var(--font-head); font-weight: 700; font-size: 1.6rem; color: var(--amber); line-height: 1.2; }
.gauge .g-v u { text-decoration: none; color: var(--ink); font-size: 1rem; }

/* ---------- 排名:锻造板 ---------- */
.forged { padding: 34px 0 44px; display: grid; gap: 16px; }
.ingot {
  display: grid; grid-template-columns: 88px 1fr 200px;
  border: 1px solid var(--line); background: var(--panel);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.ingot:hover { border-color: var(--amber-deep); transform: translateY(-2px); box-shadow: 0 16px 44px -20px rgba(245, 158, 11, 0.35); }
@media (max-width: 860px) { .ingot { grid-template-columns: 64px 1fr; } .ingot .i-stats { grid-column: 2; border-left: 0; border-top: 1px solid var(--line); } }
.i-rank { display: grid; place-items: center; border-right: 1px solid var(--line); background: var(--panel-2);
  font-family: var(--font-head); font-size: 2rem; font-weight: 700; color: var(--steel); }
.ingot:first-child .i-rank { color: var(--amber); }
.i-body { padding: 22px 26px; }
.i-body h3 { font-size: 1.45rem; margin-bottom: 7px; }
.i-body h3 .stamp { font-size: 0.62rem; letter-spacing: 0.16em; color: var(--amber); border: 1px solid var(--amber-deep); padding: 3px 9px; margin-left: 10px; vertical-align: 3px; }
.i-body p { color: var(--muted); font-size: 0.95rem; }
.i-stats { border-left: 1px solid var(--line); padding: 20px; display: flex; flex-direction: column; gap: 8px; justify-content: center; font-family: var(--font-head); }
.st { display: flex; justify-content: space-between; font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.st b { color: var(--ink); }
.i-score { font-size: 2rem; font-weight: 700; color: var(--amber); text-align: right; line-height: 1.05; position: relative; display: inline-block; margin-bottom: 8px; margin-left: auto; }
.i-score small { display: block; font-family: var(--font-body); font-size: 0.62rem; font-weight: 400; color: var(--faint); letter-spacing: 0.14em; text-transform: uppercase; }
.i-score::after { content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 3px; background: var(--amber);
  transform: scaleX(0); transform-origin: right; transition: transform 0.7s cubic-bezier(0.22,1,0.36,1) 0.35s; }
.in .i-score::after { transform: scaleX(1); }

/* ---------- 表格 ---------- */
.compare-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 24px 0; font-variant-numeric: tabular-nums; }
.compare-table th, .compare-table td { border: 1px solid var(--line); padding: 11px 14px; text-align: left; background: var(--panel); }
.compare-table th { background: var(--panel-2); color: var(--amber); font-family: var(--font-head); font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.08em; }
.compare-table td:first-child { color: var(--muted); }
@media (max-width: 640px) { .compare-table { display: block; overflow-x: auto; } .compare-table tbody { display: table; width: 100%; min-width: 480px; } }

/* ---------- 正文 ---------- */
.prose { padding: 46px 0 64px; }
.prose h2 { margin: 38px 0 14px; }
.prose p { margin-bottom: 16px; color: #c5cad1; }
.notice { border: 1px solid var(--amber-deep); background: var(--amber-soft); padding: 18px 22px; margin: 26px 0; }
.notice .n-label { font-family: var(--font-head); font-weight: 700; font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber); margin-bottom: 6px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 48px; font-size: 0.86rem; }
.footer-inner { padding: 32px 0; display: grid; gap: 12px; color: var(--muted); }
.related-note { font-size: 0.78rem; color: var(--faint); border-top: 1px solid var(--line); padding-top: 12px; }

/* ---- 微交互/无障碍/动效 ---- */
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
::selection { background: rgba(245, 158, 11, 0.28); color: #fff; }
a { text-underline-offset: 3px; }
.back-top { position: fixed; right: 18px; bottom: 18px; z-index: 30; width: 42px; height: 42px;
  display: grid; place-items: center; background: var(--amber); color: var(--bg); font-size: 1.05rem;
  opacity: 0; pointer-events: none; transition: opacity 0.25s ease; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--amber); color: var(--bg); padding: 10px 18px; font-weight: 700; }
.skip-link:focus { left: 8px; }
[data-animate] { opacity: 0; transform: translateY(14px); transition: opacity 0.65s cubic-bezier(0.22,1,0.36,1), transform 0.65s cubic-bezier(0.22,1,0.36,1); transition-delay: inherit; will-change: opacity, transform; }
[data-animate].in { opacity: 1; transform: none; }
.topbar.scrolled { box-shadow: 0 8px 30px -12px rgba(245, 158, 11, 0.25); }
.topbar { transition: box-shadow 0.25s ease; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  [data-animate] { opacity: 1; transform: none; transition: none; }
}

/* R1 typography features */
body { font-feature-settings: "kern" 1, "liga" 1, "calt" 1; -webkit-tap-highlight-color: transparent; }

/* R2 editorial measure */
.prose p { text-wrap: pretty; orphans: 3; widows: 3; }
.prose { hyphens: auto; }

/* R5 hover inner response */
.ingot:hover .i-rank { color: var(--amber); transition: color 0.25s ease; } .i-rank { transition: color 0.25s ease; }

/* R6 prose link underline grow */
.prose p a {
  background: linear-gradient(currentColor, currentColor) bottom left / 0% 1px no-repeat;
  transition: background-size 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  padding-bottom: 2px;
}
.prose p a:hover { background-size: 100% 1px; }

/* R7 themed scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #f59e0b55; border-radius: 5px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: #f59e0b; border: 2px solid transparent; background-clip: content-box; }

/* R8 touch feedback */
.ingot:active { transform: scale(0.995); }

/* R9 back-top smooth elevator */
.back-top { transform: translateY(10px); transition: opacity 0.25s ease, transform 0.3s cubic-bezier(0.22, 1, 0.36, 1); }
.back-top[style*="opacity: 1"], .back-top:hover { transform: translateY(0); }
.back-top:active { transform: translateY(2px); }

/* R1 rivet corners */
.plate::after {
  content: ""; position: absolute; inset: 8px; pointer-events: none;
  background:
    radial-gradient(circle 4px at 0 0, var(--line-bright) 98%, transparent),
    radial-gradient(circle 4px at 100% 0, var(--line-bright) 98%, transparent),
    radial-gradient(circle 4px at 0 100%, var(--line-bright) 98%, transparent),
    radial-gradient(circle 4px at 100% 100%, var(--line-bright) 98%, transparent);
  background-repeat: no-repeat;
}

/* R2 metric label alignment */
.st span { min-width: 86px; }

/* R3 footer two-column */
@media (min-width: 860px) {
  .footer-inner { grid-template-columns: 1fr auto; align-items: start; }
  .footer-inner > div:first-child { order: 1; }
  .related-note { order: 2; max-width: 56ch; border-top: 0; padding-top: 0; text-align: right; }
}

/* R4 current page nav state */
.topnav a[aria-current='page'] { color: var(--amber); }