:root {
  --paper: #f8f7f4;
  --surface: #fff;
  --ink: #17181c;
  --muted: #6b6e76;
  --brand: #2b4ee0;
  --line: #e7e5df;
  --subtle: #f1efea;
  --sun-soft: #fdf1c7;
  --green: #16805b;
  --shadow: 0 1px 2px rgb(23 24 28 / 4%), 0 14px 30px -18px rgb(23 24 28 / 18%);
  color-scheme: light;
  font-family: Geist, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-size: 15px; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
.site-shell { width: min(1240px, calc(100% - 96px)); margin: 0 auto; }
.site-header { height: 80px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgb(231 229 223 / 80%); }
.wordmark { display: inline-flex; align-items: center; gap: 12px; font-family: "Noto Serif SC", Georgia, serif; font-size: 18px; font-weight: 600; letter-spacing: -.03em; }
.mark { display: block; width: 36px; height: 36px; border-radius: 13px; object-fit: cover; box-shadow: 0 6px 16px -10px var(--brand); }
.nav { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.nav a { padding: 8px 12px; border-radius: 8px; transition: color .2s ease, background .2s ease; }
.nav a:hover { background: var(--subtle); color: var(--ink); }
.nav .lang { border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-weight: 600; }
.eyebrow { margin: 0; color: var(--brand); font-size: 11px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; }
.hero { display: grid; min-height: 620px; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 80px; border-bottom: 1px solid var(--line); padding: 96px 0; }
.hero-copy { max-width: 650px; }
h1, h2, h3 { font-family: "Noto Serif SC", Georgia, serif; font-weight: 600; letter-spacing: -.045em; }
h1 { max-width: 10ch; margin: 24px 0 0; font-size: clamp(54px, 7.4vw, 94px); line-height: 1.02; }
.hero-intro { max-width: 600px; margin: 28px 0 0; color: var(--muted); font-size: 20px; line-height: 1.65; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 34px; }
.button-primary { display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 24px; border-radius: 999px; background: var(--brand); color: #fff; font-size: 16px; font-weight: 600; box-shadow: 0 10px 24px -14px var(--brand); transition: transform .2s ease, box-shadow .2s ease; }
.button-primary:hover { transform: translateY(-1px); box-shadow: 0 14px 28px -14px var(--brand); }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 48px; padding: 0 16px; border-radius: 999px; font-size: 16px; font-weight: 600; }
.text-link:hover { background: var(--subtle); }
.note { display: flex; align-items: center; gap: 8px; margin: 16px 0 0; color: var(--muted); font-size: 12px; }
.note svg { color: var(--green); }
.field-note { position: absolute; left: -16px; top: -20px; color: rgb(107 110 118 / 70%); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; }
.evidence-wrap { position: relative; width: 100%; max-width: 510px; justify-self: end; }
.evidence-card { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: var(--shadow); }
.evidence-head { padding: 22px 24px; border-bottom: 1px solid rgb(231 229 223 / 80%); background: rgb(241 239 234 / 30%); }
.evidence-meta { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; letter-spacing: .18em; text-transform: uppercase; }
.evidence-status { display: inline-flex; align-items: center; gap: 6px; color: var(--green); font-family: Geist, sans-serif; font-size: 11px; font-weight: 600; letter-spacing: 0; white-space: nowrap; }
.evidence-status i { width: 6px; height: 6px; border-radius: 50%; background: #16a36e; }
.evidence-title-row { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-top: 28px; }
.evidence-title { margin: 0; font-size: 34px; line-height: 1.08; }
.evidence-subtitle { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.evidence-tag { flex: 0 0 auto; padding: 6px 12px; border-radius: 999px; background: var(--sun-soft); font-size: 11px; font-weight: 700; white-space: nowrap; }
.evidence-rows { padding: 0 24px; }
.evidence-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 0; border-bottom: 1px solid rgb(231 229 223 / 80%); }
.evidence-row:last-child { border-bottom: 0; }
.evidence-label { display: flex; align-items: center; gap: 12px; font-weight: 600; }
.icon { display: grid; width: 32px; height: 32px; flex: 0 0 auto; place-items: center; border-radius: 50%; background: #edf0fd; color: var(--brand); }
.evidence-value { color: var(--muted); text-align: right; }
.evidence-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px 24px; background: #17181c; color: #fff; }
.evidence-foot span:first-child { opacity: .6; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; letter-spacing: .18em; text-transform: uppercase; }
.evidence-foot span:last-child { font-size: 12px; font-weight: 600; }
.section { padding: 80px 0; border-bottom: 1px solid var(--line); }
.section-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; }
h2 { max-width: 520px; margin: 20px 0 0; font-size: clamp(34px, 4vw, 52px); line-height: 1.12; }
.section-intro { max-width: 500px; margin: 20px 0 0; color: var(--muted); font-size: 16px; line-height: 1.75; }
.topics { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.topic { padding: 8px 24px 4px; border-left: 1px solid var(--line); }
.topic:first-child { padding-left: 0; border-left: 0; }
.topic:last-child { padding-right: 0; }
.topic h3 { margin: 26px 0 0; font-size: 24px; line-height: 1.18; }
.topic p { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.loop { display: grid; grid-template-columns: .72fr 1.28fr; gap: 80px; }
.steps { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 72px 1fr; align-items: baseline; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.step:last-child { border-bottom: 0; }
.step-number { color: var(--brand); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; font-weight: 700; letter-spacing: .18em; }
.step-content { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.step h3 { margin: 0; font-size: 28px; }
.step p { max-width: 330px; margin: 0; color: var(--muted); font-size: 14px; text-align: right; }
.answer-list { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.answer-item { padding: 24px 0; border-bottom: 1px solid var(--line); }
.answer-item:last-child { border-bottom: 0; }
.answer-item h3, .faq-item h3 { margin: 0; font-size: 24px; line-height: 1.25; }
.answer-item p, .faq-item p { max-width: 680px; margin: 10px 0 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.faq-section > h2 { max-width: 680px; }
.faq-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 42px; }
.faq-item { padding-top: 20px; border-top: 1px solid var(--line); }
.footer { display: flex; align-items: end; justify-content: space-between; gap: 32px; padding: 80px 0; }
.footer h2 { max-width: 620px; margin: 0; }
.footer p { max-width: 600px; margin: 16px 0 0; color: var(--muted); font-size: 16px; }
.footer .button-primary { flex: 0 0 auto; }
svg { display: block; width: 18px; height: 18px; stroke: currentColor; stroke-width: 1.8; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.topic > svg { color: var(--brand); }
@media (max-width: 900px) {
  .site-shell { width: min(100% - 48px, 720px); }
  .hero, .section-grid, .loop { grid-template-columns: 1fr; gap: 48px; }
  .evidence-wrap { justify-self: start; }
  .topics { grid-template-columns: 1fr; }
  .topic { padding: 24px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .topic:first-child { padding-top: 8px; }
  .topic:last-child { padding-bottom: 8px; border-bottom: 0; }
  .footer { align-items: start; flex-direction: column; }
}
@media (max-width: 560px) {
  .site-shell { width: calc(100% - 40px); }
  .site-header { height: 64px; }
  .nav a:not(.lang) { display: none; }
  .hero { min-height: auto; padding: 64px 0 72px; }
  h1 { max-width: 12ch; font-size: 54px; }
  .hero-intro { font-size: 17px; line-height: 1.65; }
  .actions { align-items: stretch; flex-direction: column; }
  .button-primary, .text-link { justify-content: center; width: 100%; }
  .field-note { position: static; margin: 0 0 12px; }
  .evidence-title-row { align-items: start; flex-direction: column; }
  .evidence-value { max-width: 160px; }
  .section { padding: 64px 0; }
  .section-grid { gap: 36px; }
  h2 { font-size: 38px; }
  .step { grid-template-columns: 42px 1fr; gap: 12px; }
  .step-content { align-items: start; flex-direction: column; gap: 8px; }
  .step h3 { font-size: 26px; }
  .step p { text-align: left; }
  .faq-list { grid-template-columns: 1fr; gap: 22px; margin-top: 30px; }
  .footer { padding: 64px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}