:root {
  --ink: #10201d;
  --muted: #63716e;
  --line: #d5ddda;
  --paper: #f5f8f6;
  --white: #ffffff;
  --teal: #087f72;
  --teal-dark: #0a3f3a;
  --mint: #d9eee9;
  --amber: #a85c00;
  --amber-bg: #fff1d5;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; line-height: 1.55; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.site-header {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; display: grid; place-items: center;
  background: var(--ink); color: white; font-weight: 800; font-size: 20px;
}
.brand strong { display: block; font-size: 18px; }
.brand small { display: block; color: var(--muted); font-size: 10px; letter-spacing: 1.4px; }
nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 650; }
.source-link { border: 1px solid var(--ink); padding: 8px 15px; }

.section-shell { width: min(1180px, 90vw); margin: 0 auto; }
.hero {
  min-height: 650px;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  align-items: center;
  gap: 7vw;
  padding: 70px 0 54px;
}
.eyebrow { color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: 2px; margin: 0 0 16px; }
h1 { font-size: clamp(70px, 9vw, 126px); line-height: .82; margin: 0; letter-spacing: 0; }
.lead { font-size: 29px; line-height: 1.35; font-weight: 700; max-width: 720px; margin: 30px 0 16px; }
.hero-note { color: var(--muted); font-size: 17px; max-width: 680px; }
.actions { display: flex; gap: 12px; margin-top: 30px; }
.actions a { border: 1px solid var(--ink); padding: 12px 18px; font-weight: 750; }
.actions .primary { background: var(--teal); color: white; border-color: var(--teal); }

.snapshot { background: var(--teal-dark); color: white; padding: 30px; box-shadow: 20px 22px 0 var(--mint); }
.snapshot-head { display: flex; justify-content: space-between; font: 700 11px ui-monospace, monospace; letter-spacing: 1px; padding-bottom: 20px; border-bottom: 1px solid #41645f; }
.measured { color: #93dfd4; }
.snapshot dl { display: grid; grid-template-columns: 1fr 1fr; margin: 24px 0; border: 1px solid #496b66; }
.snapshot dl div { padding: 18px; border-right: 1px solid #496b66; border-bottom: 1px solid #496b66; }
.snapshot dl div:nth-child(even) { border-right: 0; }
.snapshot dl div:nth-last-child(-n+2) { border-bottom: 0; }
.snapshot dt { color: #a9bbb8; font-size: 12px; }
.snapshot dd { margin: 6px 0 0; font: 700 14px ui-monospace, monospace; }
.pipeline { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font: 12px ui-monospace, monospace; }
.pipeline span { border: 1px solid #496b66; padding: 8px; }
.pipeline i { color: #8dd9ce; font-style: normal; }

.metric-band { display: grid; grid-template-columns: repeat(4,1fr); background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metric-band article { padding: 32px max(24px,5vw); border-right: 1px solid var(--line); }
.metric-band article:last-child { border-right: 0; }
.metric-band span,.metric-band small { display: block; }
.metric-band span { font: 700 10px ui-monospace, monospace; color: var(--muted); letter-spacing: 1px; }
.metric-band strong { display: block; font-size: 38px; margin: 7px 0 3px; }
.metric-band small { color: var(--muted); }

.band { background: var(--white); padding: 88px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 32px; }
.section-heading h2 { margin: 0; font-size: 36px; letter-spacing: 0; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.result-panel { border: 1px solid var(--line); padding: 26px; }
.panel-title { display: flex; justify-content: space-between; align-items: center; font: 700 11px ui-monospace, monospace; color: var(--muted); }
.tag { padding: 5px 8px; font: 800 10px ui-monospace, monospace; }
.tag.dev { background: #dff2e5; color: #087338; }
.tag.final { background: #e4ebf4; color: #244d75; }
.tag.offline { background: var(--mint); color: var(--teal-dark); white-space: nowrap; }
.result-panel h3,.lane-content h3 { font-size: 23px; margin: 22px 0 5px; }
.result-panel > p,.lane-content p { color: var(--muted); }
.comparison { display: grid; grid-template-columns: 1fr auto; gap: 2px 14px; padding: 15px 0; border-top: 1px solid var(--line); }
.comparison b { font: 750 15px ui-monospace, monospace; }
.comparison em { grid-column: 2; color: var(--teal); font-style: normal; font-size: 12px; text-align: right; }
.tradeoff { background: #eef3f1; padding: 14px; margin-top: 12px; font-size: 14px; }
.tradeoff.warning { background: var(--amber-bg); color: #6d4308; }

.lanes { margin-top: 28px; display: grid; grid-template-columns: repeat(3,1fr); border: 1px solid var(--line); }
.lane { border: 0; border-right: 1px solid var(--line); background: #f3f6f5; padding: 14px; cursor: pointer; font-weight: 700; }
.lane:last-child { border-right: 0; }
.lane.active { background: var(--ink); color: white; }
.lane-content { min-height: 180px; border: 1px solid var(--line); border-top: 0; padding: 25px; display: grid; grid-template-columns: .75fr 1.6fr; gap: 18px; align-items: start; }
.lane-content h3 { margin-top: 13px; }
.lane-content p { margin-top: 4px; font-size: 17px; }
.lane-content small { grid-column: 2; color: var(--amber); }

.system-section { padding: 88px 0; }
.architecture { display: grid; grid-template-columns: repeat(9,auto); align-items: stretch; gap: 10px; }
.architecture > div { min-width: 0; border-top: 3px solid var(--teal); background: var(--white); padding: 18px; }
.architecture > i { align-self: center; color: var(--teal); font-style: normal; }
.architecture span,.architecture strong,.architecture small { display: block; }
.architecture span { color: var(--teal); font: 700 11px ui-monospace,monospace; }
.architecture strong { margin: 9px 0 3px; }
.architecture small { color: var(--muted); }
.workbench { margin: 42px 0 0; border: 1px solid var(--line); background: white; }
.workbench img { display: block; width: 100%; height: auto; }
.workbench figcaption { padding: 14px 18px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }

.evidence-band { background: var(--ink); color: white; }
.evidence-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 8vw; }
.evidence-layout h2 { font-size: 42px; margin: 0 0 18px; }
.evidence-layout p:not(.eyebrow) { color: #b8c6c3; font-size: 17px; }
.evidence-layout ul { list-style: none; padding: 0; margin: 0; }
.evidence-layout li { display: grid; grid-template-columns: 150px 1fr; gap: 20px; padding: 18px 0; border-top: 1px solid #40504d; }
.evidence-layout li span { color: #b8c6c3; }
footer { display: flex; gap: 22px; align-items: center; padding: 26px 5vw; background: #07120f; color: #aab8b5; font-size: 13px; }
footer strong { color: white; }
footer a { margin-left: auto; color: #8edbcf; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; min-height: 0; gap: 45px; }
  .metric-band { grid-template-columns: 1fr 1fr; }
  .metric-band article:nth-child(2) { border-right: 0; }
  .metric-band article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .architecture { grid-template-columns: 1fr; }
  .architecture > i { display: none; }
}

@media (max-width: 700px) {
  .site-header { position: static; padding: 13px 16px; }
  nav a:not(.source-link) { display: none; }
  nav { gap: 0; }
  .brand small { display: none; }
  .section-shell { width: min(100% - 24px, 1180px); }
  .hero { padding: 56px 0 40px; }
  h1 { font-size: 68px; }
  .lead { font-size: 24px; }
  .snapshot { padding: 22px; box-shadow: 8px 10px 0 var(--mint); }
  .snapshot dl { grid-template-columns: 1fr; }
  .snapshot dl div { border-right: 0; border-bottom: 1px solid #496b66 !important; }
  .snapshot dl div:last-child { border-bottom: 0 !important; }
  .metric-band { grid-template-columns: 1fr; }
  .metric-band article { border-right: 0; border-bottom: 1px solid var(--line) !important; padding: 25px 24px; }
  .metric-band article:last-child { border-bottom: 0 !important; }
  .band,.system-section { padding: 62px 0; }
  .section-heading { display: block; }
  .section-heading h2 { font-size: 30px; }
  .result-grid,.evidence-layout { grid-template-columns: 1fr; }
  .lanes { grid-template-columns: 1fr; }
  .lane { border-right: 0; border-bottom: 1px solid var(--line); }
  .lane:last-child { border-bottom: 0; }
  .lane-content { grid-template-columns: 1fr; }
  .lane-content small { grid-column: 1; }
  .evidence-layout li { grid-template-columns: 1fr; gap: 4px; }
  footer { align-items: flex-start; flex-direction: column; }
  footer a { margin-left: 0; }
}