:root {
  --navy: #13264a;
  --navy-soft: #273b62;
  --gold: #b88932;
  --cream: #faf8f3;
  --paper: #ffffff;
  --ink: #17233a;
  --muted: #667085;
  --line: #e5dfd4;
  --danger: #d92d20;
  --orange: #e55b13;
  --blue: #2e6bdc;
  --green: #169c51;
  --shadow: 0 18px 50px rgba(19, 38, 74, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--cream);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}
button, textarea { font: inherit; }
button { cursor: pointer; }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px max(24px, calc((100% - 1180px) / 2));
  background: rgba(250, 248, 243, 0.94);
  border-bottom: 1px solid rgba(19, 38, 74, 0.08);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--navy); text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; color: white; background: var(--navy); font-weight: 800; font-size: 21px; }
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); margin-top: -2px; }
.mode-badge { padding: 7px 13px; border: 1px solid #d8b978; border-radius: 999px; color: #8a611c; background: #fffaf0; font-size: 14px; }

.hero { padding: 100px 0 64px; text-align: center; }
.eyebrow { margin: 0 0 10px; color: var(--gold); font-size: 14px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { margin: 0; color: var(--navy); font-size: clamp(38px, 6vw, 70px); line-height: 1.16; letter-spacing: -.04em; }
.hero h1 span { color: var(--gold); }
.hero-copy { max-width: 760px; margin: 25px auto 0; color: var(--muted); font-size: clamp(17px, 2vw, 22px); }

.checker, .results { padding: clamp(24px, 5vw, 48px); background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.section-heading h2, .result-header h2 { margin: 0; color: var(--navy); font-size: clamp(28px, 4vw, 40px); line-height: 1.2; }
.section-heading > p, .result-header p { max-width: 480px; margin: 0; color: var(--muted); }
.section-heading.centered { justify-content: center; text-align: center; }
.checker label { display: block; margin: 16px 0 8px; color: var(--navy); font-weight: 700; }
textarea { width: 100%; resize: vertical; padding: 18px; color: var(--ink); background: #fff; border: 1px solid #b9c1cf; border-radius: 14px; outline: none; transition: border .2s, box-shadow .2s; }
textarea:focus { border-color: var(--navy); box-shadow: 0 0 0 4px rgba(19, 38, 74, .10); }
.criteria { margin-top: 14px; }
.criteria summary { color: #8a611c; font-weight: 700; cursor: pointer; }
.criteria textarea { margin-top: 12px; }
.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.action-row button { padding: 12px 22px; border-radius: 11px; font-weight: 700; }
.primary { border: 1px solid var(--navy); color: white; background: var(--navy); }
.primary:disabled { border-color: #a7afbd; background: #a7afbd; cursor: not-allowed; }
.secondary { border: 1px solid var(--gold); color: #8a611c; background: #fffaf0; }
.quiet { border: 1px solid #d4d8df; color: var(--navy); background: white; }
.form-note { margin: 12px 0 0; color: var(--muted); font-size: 14px; }

.results { margin-top: 34px; scroll-margin-top: 90px; }
.result-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.verdict { padding: 10px 18px; border-radius: 11px; font-weight: 800; }
.verdict.fail { color: #b42318; border: 1px solid #f7b4ad; background: #fff2f0; }
.verdict.revise { color: #9a4e0b; border: 1px solid #f7c77b; background: #fff8ec; }
.verdict.pass { color: #067647; border: 1px solid #9de1c1; background: #ecfdf3; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 28px 0; }
.stat { padding: 20px; border-radius: 14px; text-align: center; }
.stat strong, .stat span { display: block; }
.stat strong { font-size: 35px; line-height: 1.15; }
.stat.severe { color: var(--danger); background: #fff1f0; }
.stat.important { color: var(--orange); background: #fff6eb; }
.stat.general { color: var(--blue); background: #eef5ff; }
.stat.suggestion { color: var(--green); background: #ecfdf3; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
table { width: 100%; min-width: 1050px; border-collapse: collapse; background: white; }
th { padding: 14px; color: white; background: var(--navy); text-align: left; white-space: nowrap; }
td { padding: 16px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
.severity-pill { display: inline-block; min-width: 50px; padding: 4px 8px; color: white; border-radius: 7px; text-align: center; font-size: 13px; font-weight: 800; }
.severity-pill.severe { background: var(--danger); }
.severity-pill.important { background: var(--orange); }
.severity-pill.general { background: var(--blue); }
.severity-pill.suggestion { background: var(--green); }
.empty-result { padding: 40px 20px; text-align: center; color: var(--muted); }
.empty-result strong { display: block; color: var(--navy); font-size: 20px; }

.capabilities, .process { padding: 100px 0; }
.card-grid { display: grid; gap: 18px; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.card-grid.four { grid-template-columns: repeat(4, 1fr); }
.info-card, .use-card { padding: 28px; background: white; border: 1px solid var(--line); border-radius: 18px; }
.info-card span { color: var(--gold); font-weight: 900; }
.info-card h3, .use-card h3 { margin: 10px 0 7px; color: var(--navy); font-size: 21px; }
.info-card p, .use-card p { margin: 0; color: var(--muted); }
.use-cases { padding: 90px 0; background: #f1ede5; }
.use-card { text-align: center; }

.process ol { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 38px 0 0; padding: 0; list-style: none; }
.process li { position: relative; padding: 24px; text-align: center; }
.process li span, .process li strong, .process li small { display: block; }
.process li span { color: var(--gold); font-weight: 900; }
.process li strong { margin: 8px 0; color: var(--navy); font-size: 19px; }
.process li small { color: var(--muted); }

footer { padding: 56px 0 24px; color: #d6deee; background: var(--navy); }
.footer-grid { display: grid; grid-template-columns: 1.1fr .8fr 1.4fr; gap: 42px; }
footer h2, footer h3 { margin: 0 0 12px; color: white; }
footer p { margin: 0; }
.copyright { width: min(1180px, calc(100% - 40px)); margin: 38px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.15); color: #aebbd2; text-align: center; }

@media (max-width: 850px) {
  .section-heading, .result-header { align-items: flex-start; flex-direction: column; }
  .stats, .card-grid.four, .process ol { grid-template-columns: repeat(2, 1fr); }
  .card-grid.three, .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 24px, 1180px); }
  .site-header { padding: 12px; }
  .brand small { display: none; }
  .mode-badge { font-size: 12px; }
  .hero { padding: 68px 0 40px; }
  .checker, .results { padding: 20px 14px; border-radius: 17px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .card-grid.four, .process ol { grid-template-columns: 1fr; }
  .action-row button { flex: 1 1 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}