/* FELRA — GCPR-RWL-FELRA verification workbench
   Design: lab-ledger / evidence-instrument aesthetic.
   Graph-paper surface, ink text, teal "verified" stamp, amber caution. */

@font-face {
  font-family: "Space Grotesk";
  font-weight: 500;
  font-display: swap;
  src: url("../assets/fonts/space-grotesk-500.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-weight: 700;
  font-display: swap;
  src: url("../assets/fonts/space-grotesk-700.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-weight: 400;
  font-display: swap;
  src: url("../assets/fonts/jetbrains-mono-400.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-weight: 500;
  font-display: swap;
  src: url("../assets/fonts/jetbrains-mono-500.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-weight: 700;
  font-display: swap;
  src: url("../assets/fonts/jetbrains-mono-700.woff2") format("woff2");
}

:root {
  --paper: #eef2f0;
  --paper-raised: #ffffff;
  --paper-sunken: #e4e9e6;
  --ink: #10181a;
  --ink-soft: #4c5a5c;
  --ink-faint: #7c8a8b;
  --line: #cdd7d3;
  --line-strong: #aab8b3;
  --verify: #0e7c6b;
  --verify-ink: #08453c;
  --verify-dim: #dcede9;
  --caution: #a15c1d;
  --caution-dim: #f4ead8;
  --radius: 3px;

  --font-display: "Space Grotesk", "IBM Plex Sans", -apple-system, sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "Cascadia Mono", monospace;

  --max: 1120px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
  background-position: -1px -1px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--verify-ink); }
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--verify);
  outline-offset: 2px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--verify-ink);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--verify);
  display: inline-block;
}
.eyebrow.caution { color: var(--caution); }
.eyebrow.caution::before { background: var(--caution); }

/* ---------- Header ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(238, 242, 240, 0.86);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand .mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
}
.brand .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  display: none;
}
@media (min-width: 720px) {
  .brand .tag { display: inline; }
}
nav.primary {
  display: flex;
  align-items: center;
  gap: 22px;
}
nav.primary a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}
nav.primary a:hover { color: var(--verify-ink); }
nav.primary a.ext {
  color: var(--paper-raised);
  background: var(--ink);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12.5px;
}
nav.primary a.ext:hover { background: var(--verify-ink); }
.nav-links { display: none; }
@media (min-width: 860px) { .nav-links { display: flex; gap: 22px; align-items: center; } }
.nav-toggle {
  display: inline-flex;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
}
@media (min-width: 860px) { .nav-toggle { display: none; } }
#nav-mobile {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0 16px;
  border-bottom: 1px solid var(--line);
}
#nav-mobile.open { display: flex; }
#nav-mobile a {
  padding: 10px 4px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
#nav-mobile #lang-switcher-mobile {
  padding: 12px 4px;
  border-bottom: 1px solid var(--line);
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}
h1.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(52px, 9vw, 96px);
  line-height: 0.95;
  margin: 0;
  letter-spacing: -0.01em;
}
.hero-sub {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-soft);
  margin: 14px 0 0;
  letter-spacing: 0.01em;
}
.hero-sub .zh { color: var(--ink); font-family: var(--font-body); font-size: 16px; display: block; margin-bottom: 2px; }

.lead {
  max-width: 640px;
  font-size: 18px;
  color: var(--ink-soft);
  margin: 28px 0 0;
}

/* stamp */
.stamp {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  border: 1.5px dashed var(--verify);
  color: var(--verify-ink);
  border-radius: 6px;
  padding: 10px 16px;
  transform: rotate(-3deg);
  font-family: var(--font-mono);
  text-align: center;
  background: var(--verify-dim);
  user-select: none;
}
.stamp .v { font-size: 22px; font-weight: 700; letter-spacing: 0.02em; }
.stamp .s { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; margin-top: 2px; }
.stamp.caution { border-color: var(--caution); color: var(--caution); background: var(--caution-dim); }

/* pipeline flow strip */
.flow {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 13px;
}
.flow .stage {
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 9px 13px;
  white-space: nowrap;
}
.flow .arrow {
  color: var(--ink-faint);
  padding: 0 8px;
  font-size: 15px;
}

.hero-ctas {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.code-chip {
  font-family: var(--font-mono);
  font-size: 13.5px;
  background: var(--ink);
  color: #eafff9;
  padding: 12px 16px;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.code-chip .prompt { color: #6bd8bf; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid var(--ink);
  color: var(--ink);
}
.btn:hover { background: var(--ink); color: var(--paper); }

/* ---------- Sections ---------- */
section { padding: 76px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }
.section-head { max-width: 680px; margin-bottom: 44px; }
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--ink-soft); font-size: 16.5px; margin: 0; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* capability grid */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.cap-card {
  background: var(--paper-raised);
  padding: 26px 24px;
}
.cap-card .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--verify);
  letter-spacing: 0.1em;
}
.cap-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 10px 0 8px;
  font-weight: 700;
}
.cap-card p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* evidence ledger */
.ledger {
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  overflow: hidden;
}
.ledger-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 26px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-sunken);
  flex-wrap: wrap;
  gap: 12px;
}
.ledger-head .title { font-family: var(--font-mono); font-size: 13px; color: var(--ink-soft); }
.ledger-body { display: grid; grid-template-columns: 1.3fr 1fr; }
@media (max-width: 760px) { .ledger-body { grid-template-columns: 1fr; } }
.ledger-rows { padding: 26px; border-right: 1px solid var(--line); }
@media (max-width: 760px) { .ledger-rows { border-right: none; border-bottom: 1px solid var(--line); } }
.ledger-row { padding: 14px 0; border-bottom: 1px dashed var(--line); }
.ledger-row:last-child { border-bottom: none; }
.ledger-row .k {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
.ledger-row .v { font-size: 15px; }
.hash {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--verify-ink);
  word-break: break-all;
  background: var(--verify-dim);
  padding: 8px 10px;
  border-radius: var(--radius);
  display: inline-block;
  line-height: 1.6;
}
.ledger-figure { padding: 26px; display: flex; flex-direction: column; gap: 14px; align-items: center; justify-content: center; }
.ledger-figure img { max-width: 100%; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.ledger-figure figcaption { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); text-align: center; }
.stamp-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.stamp-mini {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  border: 1px dashed var(--verify);
  color: var(--verify-ink);
  background: var(--verify-dim);
  border-radius: 4px;
}
.ledger-caveat {
  padding: 16px 26px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  background: var(--paper-sunken);
}

/* quickstart */
.term {
  background: #0e1517;
  color: #d7ede7;
  border-radius: 6px;
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.9;
  overflow-x: auto;
}
.term .c { color: #6bd8bf; }
.term .comment { color: #6f8a86; }
.qs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 760px) { .qs-grid { grid-template-columns: 1fr; } }
.qs-label { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); margin-bottom: 10px; letter-spacing: 0.06em; text-transform: uppercase; }

/* boundaries */
.bounds { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.bound-item {
  background: var(--paper-raised);
  padding: 18px 22px;
  border-left: 3px solid var(--caution);
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.bound-item .glyph { font-family: var(--font-mono); color: var(--caution); font-size: 15px; margin-top: 2px; }
.bound-item p { margin: 0; font-size: 15px; }

/* version arc */
.arc { border-left: 2px solid var(--line-strong); margin-left: 8px; }
.arc-item { position: relative; padding: 4px 0 28px 28px; }
.arc-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 2px solid var(--verify);
}
.arc-item.latest::before { background: var(--verify); }
.arc-item .ver {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}
.arc-item .ver .date { color: var(--ink-faint); font-weight: 400; font-size: 12.5px; margin-left: 10px; }
.arc-item p { margin: 6px 0 0; color: var(--ink-soft); font-size: 14.5px; max-width: 640px; }

/* footer */
footer.site { padding: 56px 0 48px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }
.foot-grid h4 { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); margin: 0 0 14px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.foot-grid a { color: var(--ink-soft); text-decoration: none; font-size: 14.5px; }
.foot-grid a:hover { color: var(--verify-ink); }
.foot-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--ink-faint);
}
.foot-bottom a { color: var(--ink-faint); }

code.inline {
  font-family: var(--font-mono);
  background: var(--paper-sunken);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.92em;
}