:root {
  --ink: #1d1b16;
  --muted: #6b6459;
  --line: #e2ddd2;
  --bg: #fbf9f5;
  --card: #ffffff;
  --accent: #8a5a2b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.7 "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff; padding: 8px 12px;
}
.skip-link:focus { left: 8px; z-index: 10; }
.site-head {
  display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: baseline;
  padding: 20px 24px; border-bottom: 1px solid var(--line); background: var(--card);
}
.brand { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: 0.02em; }
.brand-note { margin-left: 8px; font-size: 12px; font-weight: 400; color: var(--muted); }
.site-nav ul, .foot-nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0; padding: 0; list-style: none; }
.site-nav a, .foot-nav a { color: var(--ink); text-decoration: none; border-bottom: 2px solid transparent; padding: 6px 2px; }
.site-nav a:hover, .foot-nav a:hover, .site-nav a:focus-visible, .foot-nav a:focus-visible { border-bottom-color: var(--accent); }
.site-nav a[aria-current="page"] { border-bottom-color: var(--accent); font-weight: 700; }
main { max-width: 980px; margin: 0 auto; padding: 32px 24px 56px; }
section { margin: 0 0 40px; }
h1 { font-size: 30px; line-height: 1.35; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 0 0 12px; }
h3 { font-size: 17px; margin: 0 0 8px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 13px; letter-spacing: 0.16em; text-transform: uppercase; }
.lead { font-size: 17px; color: var(--ink); }
.muted { color: var(--muted); font-size: 14px; }
.warn {
  border-left: 4px solid var(--accent); background: #fff6e8; padding: 10px 14px; margin: 0 0 12px;
  font-weight: 700;
}
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin: 0; padding: 0; list-style: none; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.card dl { margin: 0; }
.card dt { font-size: 12px; letter-spacing: 0.08em; color: var(--muted); margin-top: 10px; }
.card dd { margin: 2px 0 0; font-size: 14px; }
.code { display: inline-block; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; background: #f1ece2; color: var(--accent); border-radius: 4px; padding: 1px 6px; margin-right: 6px; }
.demo-tag { display: inline-block; margin: 0 0 8px; font-size: 12px; font-weight: 700; color: #7a3b12; background: #fde8d4; border-radius: 999px; padding: 2px 10px; }
.steps, .lifecycle, .exclusions, .verdicts { margin: 0; padding: 0; list-style: none; }
.step, .lifecycle li, .exclusions li, .verdicts li {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; margin-bottom: 8px;
}
.step-n { display: inline-block; width: 26px; height: 26px; line-height: 26px; text-align: center; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; margin-right: 8px; }
.lifecycle .who { margin-left: 10px; font-size: 13px; color: var(--muted); }
.lifecycle .exit { display: block; font-size: 13px; color: var(--muted); }
.note { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 8px; padding: 16px 20px; }
.fields { display: grid; gap: 14px; margin: 0 0 16px; padding: 0; list-style: none; }
.field label, .field .label { font-weight: 700; font-size: 15px; }
.field input[type="text"], .field input[type="email"], .field textarea {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
.field input:focus-visible, .field textarea:focus-visible, .choices input:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
.choices { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 6px; }
.choice, .check { display: inline-flex; align-items: flex-start; gap: 8px; font-weight: 400; }
.check { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.submit { font: inherit; font-weight: 700; padding: 12px 20px; border-radius: 8px; border: 1px solid var(--line); background: #efe9de; color: var(--muted); }
.submit[disabled] { cursor: not-allowed; }
.cta { display: inline-block; margin-top: 8px; padding: 14px 22px; border-radius: 8px; background: var(--accent); color: #fff; font-weight: 700; text-decoration: none; }
.cta:hover, .cta:focus-visible { background: #6f4720; }
.site-foot { border-top: 1px solid var(--line); background: var(--card); padding: 24px; font-size: 14px; }
.status-line { margin: 0 0 12px; font-weight: 700; }
.ai-line { margin: 12px 0 0; color: var(--muted); }
a { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
@media (max-width: 760px) {
  main { padding: 24px 18px 40px; }
  h1 { font-size: 24px; }
  .site-head { padding: 16px 18px; }
}
@media (max-width: 480px) {
  body { font-size: 15px; }
  .site-nav ul { gap: 2px 12px; }
  .site-nav a, .foot-nav a, .cta, .submit { min-height: 48px; display: inline-flex; align-items: center; }
  .choice, .check { min-height: 48px; align-items: center; }
  .choice input, .check input { width: 20px; height: 20px; }
  .cards { grid-template-columns: 1fr; }
  .cta { width: 100%; justify-content: center; }
}