/* TSMAI shared styles; design tokens follow website-spec.md section 5. */
:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --ink: #1a2230;
  --muted: #5b6676;
  --line: #e3e8ef;
  --brand: #0e6ba8;
  --brand-dark: #084c78;
  --accent: #14a098;
  --warn-bg: #fff7ed;
  --warn-line: #fdba74;
  --maxw: 860px;
  --maxw-wide: 1100px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1620; --surface: #161f2c; --ink: #e6ebf2; --muted: #9aa7b8;
    --line: #26313f; --brand: #4db4e8; --brand-dark: #7cc7ee; --accent: #2dd4bf;
    --warn-bg: #2a2113; --warn-line: #a3701f;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
    "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  line-height: 1.75; font-size: 16px;
}
a { color: var(--brand); }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--accent); outline-offset: 3px;
}
p { margin: 12px 0; }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }

/* ---- top nav ---- */
.skip-link {
  position: fixed; left: 16px; top: 8px; z-index: 100;
  padding: 8px 14px; background: var(--surface); color: var(--ink);
  border: 2px solid var(--accent); border-radius: 8px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }
.topnav {
  background: var(--surface); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.topnav .wrap {
  max-width: var(--maxw-wide); margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px 16px;
}
.topnav .brand {
  font-weight: 700; text-decoration: none; color: var(--ink);
  font-size: 1.12rem; min-width: 0; max-width: 100%;
}
.topnav .brand .en { display: block; color: var(--muted); font-weight: 500; font-size: .76rem; line-height: 1.4; }
.topnav .brand .zh { display: block; font-size: .86rem; line-height: 1.4; }
.nav-toggle {
  display: none; border: 1px solid var(--line); border-radius: 8px;
  background: var(--surface); color: var(--ink); padding: 7px 12px;
  font: inherit; font-weight: 700; cursor: pointer;
}
.topnav .links { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 14px; }
.topnav .links a {
  text-decoration: none; color: var(--ink); font-size: .95rem; padding: 4px 2px;
  border-bottom: 2px solid transparent;
}
.topnav .links a:hover { color: var(--brand); }
.topnav .links a[aria-current="page"] { color: var(--brand); border-bottom-color: var(--brand); }
.nav-pending {
  display: inline-flex; align-items: center; gap: 5px; color: var(--muted);
  font-size: .9rem; padding: 4px 2px;
}
.nav-pending .status-pending { padding: 0 7px; font-size: .7rem; }
.legal-status {
  margin: 0; padding: 8px 20px; text-align: center;
  background: var(--warn-bg); border-bottom: 1px solid var(--warn-line);
  color: var(--ink); font-size: .9rem; font-weight: 700;
}
@media (max-width: 800px) {
  .topnav .wrap { align-items: center; }
  .topnav .links {
    width: 100%; align-items: stretch; flex-direction: column; gap: 2px;
    padding: 10px 0 4px; border-top: 1px solid var(--line);
  }
  .topnav .links a, .nav-pending { padding: 8px 4px; font-size: .95rem; }
  .js .nav-toggle { display: inline-block; }
  .js .topnav .links[hidden] { display: none; }
  body.nav-open { overflow: hidden; }
}
@media (max-width: 480px) {
  .topnav .brand .en { display: none; }
}

/* ---- hero ---- */
header.hero {
  background: linear-gradient(135deg, #084c78, #0e6ba8 60%, #0b716d);
  color: #fff; padding: 56px 24px 44px;
}
header.hero .wrap { max-width: var(--maxw-wide); margin: 0 auto; }
header.hero .eyebrow { text-transform: uppercase; letter-spacing: .12em;
  font-size: .8rem; opacity: .85; margin: 0 0 8px; }
header.hero h1 { margin: 0 0 12px; font-size: 2rem; line-height: 1.35; max-width: 760px; }
header.hero p.lead { margin: 0; font-size: 1.05rem; opacity: .95; max-width: 680px; }
header.hero .badges { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 8px; }
header.hero .badge {
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.28);
  padding: 5px 12px; border-radius: 999px; font-size: .82rem; backdrop-filter: blur(4px);
}
header.hero .actions { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 600; font-size: .98rem;
  padding: 10px 24px; border-radius: 999px; border: 2px solid transparent;
}
.btn.primary { background: #fff; color: #084c78; }
.btn.primary:hover { background: rgba(255,255,255,.88); }
.btn.ghost { border-color: rgba(255,255,255,.6); color: #fff; }
.btn.ghost:hover { background: rgba(255,255,255,.12); }
main .btn.primary { background: var(--brand); color: #fff; }
main .btn.primary:hover { background: var(--brand-dark); }
main .btn.ghost { border-color: var(--brand); color: var(--brand); }

/* ---- layout ---- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px 80px; }
main.wide { max-width: var(--maxw-wide); }
.breadcrumb { margin: 22px 0 26px; color: var(--muted); font-size: .9rem; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.breadcrumb li + li::before { content: "›"; margin-right: 6px; }
.breadcrumb [aria-current="page"] { color: var(--ink); }
section { margin: 0 0 52px; scroll-margin-top: 70px; }
h2.sec { font-size: 1.5rem; margin: 0 0 4px; border-top: 3px solid var(--line); padding-top: 28px; }
h2.sec .num { color: var(--accent); font-variant-numeric: tabular-nums; margin-right: 10px; }
h3 { font-size: 1.15rem; margin: 28px 0 10px; }
.section-lead { color: var(--muted); margin-top: 0; }

/* ---- cards ---- */
.cards { display: grid; gap: 16px; margin: 20px 0; }
.cards.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cards.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 760px) { .cards.cols-3, .cards.cols-2 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px 22px; box-shadow: 0 4px 18px rgba(16,30,54,.05);
}
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 6px 0 0; font-size: .95rem; color: var(--muted); }
.card .kicker { color: var(--accent); font-weight: 700; font-size: .82rem;
  text-transform: uppercase; letter-spacing: .08em; margin: 0 0 6px; }
.card a.more { font-size: .9rem; }
.task-card { display: flex; flex-direction: column; }
.task-card .task-links { margin-top: auto; padding-top: 14px; }
.task-card .task-links a { display: inline-block; margin: 3px 10px 3px 0; }
.task-card .status-line { margin-top: 12px; }
.project-card { display: flex; flex-direction: column; }
.project-card .project-link { margin-top: auto; padding-top: 14px; }
.project-card .limitation { color: var(--ink); }

/* ---- project evidence navigation / metadata ---- */
.local-nav {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 18px; margin: 20px 0 34px;
}
.local-nav h2 { font-size: 1rem; margin: 0 0 6px; }
.local-nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; }
.local-nav li { margin: 0; }
.metadata-list { display: grid; gap: 0; margin: 18px 0; }
.metadata-list div {
  display: grid; grid-template-columns: minmax(9rem, 12rem) 1fr;
  border-bottom: 1px solid var(--line); padding: 9px 0;
}
.metadata-list dt { font-weight: 700; }
.metadata-list dd { margin: 0; overflow-wrap: anywhere; }
.metadata-list.compact { margin: 12px 0; }
.metadata-list.compact div { grid-template-columns: 6.5rem 1fr; padding: 5px 0; font-size: .9rem; }
code { overflow-wrap: anywhere; }
@media (max-width: 520px) {
  .metadata-list div, .metadata-list.compact div { grid-template-columns: 1fr; }
}

/* ---- tables ---- */
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: .93rem;
  background: var(--surface); border-radius: 10px; overflow: hidden; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line);
  vertical-align: top; }
th { background: rgba(14,107,168,.08); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: none; }

/* ---- callouts / tags ---- */
.callout {
  background: var(--warn-bg); border: 1px solid var(--warn-line); border-left-width: 4px;
  padding: 14px 18px; border-radius: 10px; margin: 18px 0;
}
.callout.info { background: rgba(20,160,152,.08); border-color: var(--accent); }
.callout p { margin: 6px 0; }
.layer-tag { display: inline-block; min-width: 20px; text-align: center;
  background: var(--accent); color: #fff; border-radius: 6px; padding: 1px 8px;
  font-size: .8rem; font-weight: 700; margin-right: 6px; }
.tag {
  display: inline-block; background: rgba(14,107,168,.1); color: var(--brand);
  border-radius: 6px; padding: 1px 10px; font-size: .8rem; font-weight: 600;
  margin: 2px 4px 2px 0; white-space: nowrap;
}
.tag.pending { background: rgba(125,140,160,.14); color: var(--muted); font-weight: 500; }
.tag.result-negative { background: rgba(185,28,28,.12); color: #b91c1c; }
.tag.result-inconclusive { background: rgba(180,83,9,.14); color: #a34d08; }
.tag.result-missing { background: rgba(91,102,118,.14); color: var(--muted); }
.tag.result-out-of-scope { background: rgba(14,107,168,.12); color: var(--brand); }
@media (prefers-color-scheme: dark) {
  .tag.result-negative { color: #fca5a5; }
  .tag.result-inconclusive { color: #fdba74; }
}
.status-pending {
  display: inline-block; border: 1px dashed var(--warn-line); color: var(--muted);
  border-radius: 999px; padding: 1px 12px; font-size: .8rem; vertical-align: 2px;
}
.review-metadata { margin-top: 18px; }
.source-list { overflow-wrap: anywhere; }
.steps { padding-left: 1.4rem; }
.steps li { margin: 10px 0; }

/* ---- iron rules band ---- */
.rules-band {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 24px 26px; box-shadow: 0 4px 18px rgba(16,30,54,.05);
}
.rules-band h2 { margin: 0 0 6px; font-size: 1.3rem; }
.rules-band ol { margin: 12px 0 0; }
.rules-band li strong { color: var(--brand); }

/* ---- five-layer diagram ---- */
.layers { display: grid; gap: 10px; margin: 20px 0; }
.layer {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 16px; display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap;
}
.layer .layer-name { font-weight: 700; min-width: 9.5em; }
.layer .projs { color: var(--muted); font-size: .9rem; }

/* ---- timeline ---- */
.timeline { list-style: none; padding: 0; margin: 20px 0; border-left: 3px solid var(--line); }
.timeline li { margin: 0 0 22px; padding: 0 0 0 22px; position: relative; }
.timeline li::before {
  content: ""; position: absolute; left: -8.5px; top: 8px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--accent); border: 3px solid var(--bg);
}
.timeline .when { font-weight: 700; color: var(--brand); }
.timeline p { margin: 4px 0 0; font-size: .95rem; color: var(--muted); }

/* ---- footer ---- */
footer.site {
  border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem;
  margin-top: 40px;
}
footer.site .wrap {
  max-width: var(--maxw-wide); margin: 0 auto; padding: 32px 24px 60px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
@media (max-width: 760px) { footer.site .wrap { grid-template-columns: 1fr; } }
footer.site h4 { margin: 0 0 8px; font-size: .9rem; color: var(--ink); }
footer.site ul { list-style: none; padding: 0; margin: 0; }
footer.site li { margin: 4px 0; }
footer.site a { color: var(--brand); text-decoration: none; }
footer.site a:hover { text-decoration: underline; }
footer.site .legal { grid-column: 1 / -1; border-top: 1px solid var(--line);
  padding-top: 16px; margin-top: 8px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}