html { scroll-padding-top: 84px; }
/* ============================================================
   TEMPLATE 04 — Nightlab
   暗色技术风:深海军蓝、电光青、等宽数据字体、面板边框。
   适用:AI / 开发者工具 / MCP / LLM / API 类 niche。
   字体:Sora(标题)+ Inter(正文)+ JetBrains Mono(数据)。
   ============================================================ */

:root {
  --bg: #0a0f1e;
  --bg-panel: #101830;
  --bg-panel-2: #141f3d;
  --line: #223054;
  --line-bright: #35497c;
  --ink: #e8edf8;
  --muted: #9dabc9;
  --faint: #667394;
  --cyan: #22d3ee;
  --cyan-dim: #0e7490;
  --cyan-soft: #0c2233;
  --lime: #a3e635;
  --amber: #fbbf24;
  --red: #fb7185;
  --font-head: "Sora", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-body); background: var(--bg); color: var(--ink); line-height: 1.68; font-size: 16.5px; -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-synthesis-weight: none; }
a { color: var(--cyan); }
a:hover { color: #7deefc; }
h1, h2, h3 {
  text-wrap: balance; font-family: var(--font-head); line-height: 1.2; letter-spacing: -0.02em; font-weight: 600; }
h1 { font-size: clamp(1.9rem, 4.2vw, 3rem); }
h2 { font-size: 1.5rem; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }

/* ---------- 顶栏:细边框 + 终端提示符 ---------- */
.topbar { border-bottom: 1px solid var(--line); background: rgba(10, 15, 30, 0.92); }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }
.brand { font-family: var(--font-mono); font-size: 0.98rem; color: var(--ink); }
.brand::before { content: "▍"; color: var(--cyan); margin-right: 8px; }
.brand:hover { color: #fff; }
.topnav { display: flex; gap: 24px; font-family: var(--font-mono); font-size: 0.8rem; }
.topnav a { color: var(--muted); text-decoration: none; }
.brand { text-decoration: none; }
.topnav a:hover { color: var(--cyan); }
@media (max-width: 720px) { .topnav { display: none; } }

/* ---------- Hero:面板 + 状态行 ---------- */
.hero {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1200px 400px at 70% -20%, rgba(34, 211, 238, 0.08), transparent),
    linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
}
.status-line { font-family: var(--font-mono); font-size: 0.78rem; color: var(--cyan-dim); margin-bottom: 18px; }
.status-line b { color: var(--lime); font-weight: 500; }
.hero h1 { margin-bottom: 14px; }
.hero h1 .hl { color: var(--cyan); }
.hero .lede { color: var(--muted); max-width: 66ch; font-size: 1.08rem; }
.hero-meta { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }
.chip { font-family: var(--font-mono); font-size: 0.74rem; color: var(--muted); border: 1px solid var(--line); background: var(--bg-panel); padding: 4px 12px; border-radius: 6px; }
.chip b { color: var(--cyan); font-weight: 500; }

/* ---------- 排名面板 ---------- */
.rank-panels { padding: 36px 0; display: grid; gap: 16px; }
.panel {
  display: grid; grid-template-columns: 92px 1fr 200px;
  border: 1px solid var(--line); background: var(--bg-panel);
  border-radius: 10px; overflow: hidden;
}
.panel { transition: border-color 0.2s ease, box-shadow 0.2s ease; }
.panel:hover { border-color: var(--cyan-dim); box-shadow: 0 0 0 1px var(--cyan-dim), 0 12px 40px -18px rgba(34, 211, 238, 0.35); }
.panel:hover .p-rank { color: var(--cyan); }
@media (max-width: 860px) { .panel { grid-template-columns: 70px 1fr; } .panel .p-metrics { grid-column: 2; border-left: 0; border-top: 1px solid var(--line); } }
.p-rank {
  display: grid; place-items: center; border-right: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 2rem; font-weight: 700; color: var(--cyan-dim);
  background: var(--bg-panel-2);
}
.p-rank.top { color: var(--cyan); }
.p-body { padding: 22px 24px; }
.p-body h3 { font-size: 1.25rem; margin-bottom: 8px; }
.p-body h3 .tag { font-family: var(--font-mono); font-size: 0.66rem; font-weight: 500; color: var(--lime); border: 1px solid #3f5220; background: #1a2408; padding: 2px 9px; border-radius: 5px; margin-left: 10px; vertical-align: 2px; }
.p-body p { color: var(--muted); font-size: 0.95rem; }
.p-metrics { border-left: 1px solid var(--line); padding: 22px; display: flex; flex-direction: column; gap: 10px; justify-content: center; font-family: var(--font-mono); }
.m-row { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--muted); }
.m-row b { color: var(--ink); font-weight: 500; }
.m-score { font-size: 1.7rem; color: var(--cyan); font-weight: 700; text-align: right; }
.m-score small { font-size: 0.7rem; color: var(--faint); display: block; text-align: right; letter-spacing: 0.1em; }
.m-score::after { content: ""; display: block; height: 4px; margin-top: 8px; border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan-dim) var(--pct, 90%), var(--line) var(--pct, 90%)); }

/* ---------- 表格 ---------- */
.compare-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 24px 0; font-family: var(--font-mono); }
.compare-table th, .compare-table td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.compare-table th { background: var(--bg-panel-2); color: var(--cyan); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; }
.compare-table td:first-child { color: var(--muted); }

/* ---------- 正文 ---------- */
.prose { padding: 48px 0 64px; }
.prose h2 { margin: 36px 0 14px; }
.prose p { margin-bottom: 16px; color: #c6d0e4; }
.codeblock { background: var(--bg-panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted); margin: 20px 0; overflow-x: auto; }
.codeblock .k { color: var(--cyan); }
.callout { border: 1px solid var(--cyan-dim); background: var(--cyan-soft); border-radius: 10px; padding: 18px 22px; margin: 26px 0; }
.callout .c-label { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--cyan); margin-bottom: 8px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 48px; background: var(--bg-panel); font-size: 0.86rem; }
.footer-inner { padding: 32px 0; display: grid; gap: 12px; color: var(--muted); }
.related-note { font-family: var(--font-mono); font-size: 0.74rem; color: #7d8aa8; border-top: 1px solid var(--line); padding-top: 12px; }

/* ---- R7 micro-interactions ---- */
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; border-radius: 2px; }
::selection { background: rgba(34, 211, 238, 0.18); }
a { text-underline-offset: 3px; }

/* ---- R8 tables ---- */
.compare-table { font-variant-numeric: tabular-nums; }
.compare-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
@media (max-width: 640px) { .compare-table { min-width: 520px; } }

/* ---- R9 badges ---- */
[class*="badge"], [class*="pill"], [class*="tag"], .chip {
  white-space: nowrap; flex-shrink: 0;
}

/* ---- R10 nav ---- */
@media (max-width: 720px) {
  .topbar-inner, .masthead-top { flex-wrap: wrap; }
}
.topnav a[aria-current="page"] { font-weight: 700; }

/* ---- R11 footer ---- */
.related-note { line-height: 1.6; max-width: 88ch; }
.back-top { position: fixed; right: 18px; bottom: 18px; z-index: 30;
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(20, 20, 24, 0.82); color: #fff;
  font-size: 1.05rem; text-decoration: none;
  opacity: 0; pointer-events: none; transition: opacity 0.25s ease;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25); }
.back-top:hover { opacity: 1 !important; }
@media (prefers-reduced-motion: reduce) { .back-top { transition: none; } }

/* ---- R13 dark specialization ---- */
body { background-image: radial-gradient(1600px 500px at 80% -10%, rgba(34, 211, 238, 0.05), transparent); }
.status-line::after { content: "▊"; color: var(--cyan); margin-left: 6px; animation: blink 1.2s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .status-line::after { animation: none; } }
.panel { position: relative; }
.panel::before {
  content: ""; position: absolute; inset: 0; border-radius: 10px; padding: 1px;
  background: linear-gradient(135deg, rgba(34,211,238,0.35), transparent 40%, transparent 70%, rgba(34,211,238,0.15));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0.5; pointer-events: none;
}
.panel:hover::before { opacity: 1; }
::selection { background: rgba(34, 211, 238, 0.3); }

/* ---- R15 responsive ---- */
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  html { scroll-padding-top: 72px; }
}

/* ---- R16 a11y ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 100;
  background: #fff; color: #111; padding: 10px 18px; border-radius: 8px;
  font-weight: 700; box-shadow: 0 4px 16px rgba(0,0,0,0.2); }
.skip-link:focus { left: 8px; }

/* ---- Motion layer (R1) : transform/opacity only ---- */
[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; }
@media (prefers-reduced-motion: reduce) {
  [data-animate] { opacity: 1; transform: none; transition: none; }
}

/* R3: score gauge draws in */
.m-score::after { transform: scaleX(0); transform-origin: left; transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.3s; }
.panel.in .m-score::after { transform: scaleX(1); }

/* R5: arrow nudge on hover */
.col-link a::after, .score-cta::after, .rank-more a::after { display: inline-block; transition: transform 0.2s ease; }
.col-link a:hover::after, .score-cta:hover::after, .rank-more a:hover::after { transform: translateX(4px); }
a[class*="cta"]::after, .r-score a::after { content: none; }
.r-score a::after { content: " →"; display: inline-block; transition: transform 0.2s ease; }
.r-score a:hover::after { transform: translateX(4px); }

/* R6: scrolled header shadow */
.topbar.scrolled, .masthead.scrolled { box-shadow: 0 6px 24px -10px rgba(10, 15, 30, 0.28); transition: box-shadow 0.25s ease; }
.topbar, .masthead { transition: box-shadow 0.25s ease; }

/* R7 brand signature */
.brand::before { display: inline-block; animation: cursorblink 1.2s steps(1) infinite; }
@keyframes cursorblink { 50% { opacity: 0.2; } }

/* R8: terminal boot sequence */
.status-line { opacity: 0; animation: bootin 0.5s ease forwards; }
.status-line b { opacity: 0; animation: bootin 0.4s ease forwards 0.35s; }
@keyframes bootin { to { opacity: 1; } }
.hero h1 { animation: heroRise 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.15s backwards; }
.hero .lede { animation: heroRise 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.3s backwards; }
.hero-meta { animation: heroRise 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.45s backwards; }
@keyframes heroRise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .status-line, .status-line b, .hero h1, .hero .lede, .hero-meta { animation: none; opacity: 1; transform: 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; }

/* R3 mono numerals */
[class*="mono"], .term-body, .t-output, .idx-tags, .hero-meta { font-variant-numeric: slashed-zero; }

/* R5 hover inner response */
.panel:hover .p-rank { transform: scale(1.06); } .p-rank { transition: transform 0.25s ease; color: var(--cyan); }

/* 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: #22d3ee55; border-radius: 5px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: #22d3ee; border: 2px solid transparent; background-clip: content-box; }

/* R8 touch feedback */
.panel: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); }

/* R2 metric label alignment */
.m-row span { min-width: 90px; }

/* 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(--cyan); }