:root {
  --ink: #17303b;
  --muted: #5e7078;
  --brand: #0e6b61;
  --brand-dark: #084b45;
  --accent: #d79a3b;
  --paper: #f7f4ed;
  --soft: #edf5f2;
  --line: #d9e1de;
  --white: #fff;
  --shadow: 0 16px 42px rgba(19, 49, 57, .09);
  --radius: 18px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font: 16px/1.75 "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; z-index: 999; background: #fff; padding: 10px 14px; }
.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: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: var(--ink); display: flex; flex-direction: column; line-height: 1.2; }
.brand strong { font-size: 21px; letter-spacing: .04em; }
.brand span { color: var(--muted); font-size: 12px; margin-top: 5px; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: var(--ink); font-size: 15px; }
.site-nav a[aria-current="page"] { color: var(--brand); font-weight: 700; }
.nav-cta, .button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff !important;
  font-weight: 700;
  border: 1px solid var(--brand);
}
.button:hover, .nav-cta:hover { background: var(--brand-dark); }
.button.secondary { background: transparent; color: var(--brand) !important; }
.menu-toggle { display: none; border: 0; background: transparent; color: var(--ink); font-size: 24px; }

.hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 90% 20%, rgba(215,154,59,.24), transparent 28%),
    linear-gradient(135deg, #f0f7f4 0%, #fff 58%, #f8f1e4 100%);
  padding: 92px 0 76px;
}
.hero-grid { display: grid; grid-template-columns: 1.25fr .75fr; align-items: center; gap: 64px; }
.eyebrow { color: var(--brand); font-weight: 800; letter-spacing: .1em; font-size: 14px; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.3; margin-top: 0; }
h1 { font-size: clamp(36px, 5vw, 62px); letter-spacing: -.025em; margin-bottom: 24px; }
h2 { font-size: clamp(28px, 3.5vw, 42px); margin-bottom: 18px; }
h3 { font-size: 21px; margin-bottom: 10px; }
.hero p { color: var(--muted); font-size: 18px; max-width: 760px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-proof { background: rgba(255,255,255,.84); border: 1px solid var(--line); border-radius: 24px; padding: 28px; box-shadow: var(--shadow); }
.hero-proof h2 { font-size: 20px; }
.proof-list { display: grid; gap: 17px; }
.proof-item { padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.proof-item:last-child { border-bottom: 0; padding-bottom: 0; }
.proof-item strong { display: block; color: var(--brand-dark); font-size: 18px; }
.proof-item span { color: var(--muted); font-size: 14px; }

.facts { background: var(--brand-dark); color: #fff; }
.facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.fact { padding: 26px 22px; border-right: 1px solid rgba(255,255,255,.18); }
.fact:last-child { border-right: 0; }
.fact strong { display: block; font-size: 19px; }
.fact span { color: rgba(255,255,255,.75); font-size: 13px; }

.section { padding: 82px 0; }
.section.soft { background: var(--soft); }
.section.paper { background: var(--paper); }
.section-heading { max-width: 760px; margin-bottom: 38px; }
.section-heading p, .lead, .muted { color: var(--muted); }
.grid-2, .grid-3, .grid-4 { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 8px 30px rgba(19,49,57,.04);
}
.card p:last-child { margin-bottom: 0; }
.card .label, .tag { display: inline-block; color: var(--brand); background: var(--soft); border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 700; margin-bottom: 14px; }
.card-link { display: inline-flex; margin-top: 14px; font-weight: 700; }
.service-card { position: relative; padding-top: 34px; }
.service-card::before { content: ""; position: absolute; top: 0; left: 28px; width: 46px; height: 4px; background: var(--accent); border-radius: 4px; }

.page-hero { padding: 66px 0 54px; background: linear-gradient(135deg, var(--soft), #fff); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(34px, 4vw, 50px); margin-bottom: 16px; }
.breadcrumbs { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
.breadcrumbs a { color: var(--muted); }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 44px; align-items: start; }
.prose h2 { margin-top: 46px; font-size: 30px; }
.prose h3 { margin-top: 30px; }
.prose p, .prose li { color: #344c55; }
.prose ul, .prose ol { padding-left: 22px; }
.sidebar { position: sticky; top: 100px; }
.sidebar .card + .card { margin-top: 18px; }
.checklist { list-style: none; padding: 0 !important; }
.checklist li { position: relative; padding-left: 28px; margin: 10px 0; }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: 800; }
.notice { border-left: 4px solid var(--accent); background: #fff8eb; padding: 18px 20px; border-radius: 0 12px 12px 0; color: #654b21; }
.answer-box { margin: 28px 0 38px; padding: 24px 26px; border: 1px solid #bcd8d1; border-radius: 16px; background: var(--soft); color: #23444b; font-size: 18px; }
.answer-box strong { color: var(--brand-dark); }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 20px; color: var(--muted); font-size: 14px; margin-top: 22px; }
.article-card { display: flex; flex-direction: column; }
.article-card h2 { font-size: 23px; }
.article-card .card-link { margin-top: auto; padding-top: 10px; }
.article-source { margin-top: 46px; padding-top: 28px; border-top: 1px solid var(--line); }
.article-source li { margin: 8px 0; }
.comparison-table { width: 100%; border-collapse: collapse; margin: 22px 0 30px; background: #fff; }
.comparison-table th, .comparison-table td { padding: 14px 16px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison-table th { background: var(--soft); color: var(--brand-dark); }
.founder { display: grid; grid-template-columns: minmax(260px, 360px) 1fr; gap: 42px; align-items: center; margin: 12px 0 46px; padding: 30px; border: 1px solid var(--line); border-radius: 22px; background: linear-gradient(135deg, var(--soft), #fff); }
.founder-photo { display: block; width: 100%; max-height: 520px; object-fit: cover; object-position: center 15%; border-radius: 16px; box-shadow: var(--shadow); }
.founder h2 { margin-top: 0; }
.founder-role { color: var(--brand); font-weight: 800; }
.byline { display: flex; gap: 14px; align-items: center; margin: 30px 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; }
.byline strong, .byline span { display: block; }
.byline span { color: var(--muted); font-size: 14px; }
.evidence { display: grid; grid-template-columns: 260px 1fr; gap: 28px; align-items: center; }
.evidence img { border-radius: 12px; border: 1px solid var(--line); background: #fff; }
.evidence + .evidence { margin-top: 30px; }
.case-card .status { color: #7b5a22; background: #fff3d8; }
.case-fields { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 24px; margin-top: 18px; }
.case-fields span { color: var(--muted); font-size: 14px; }
.case-fields strong { display: block; color: var(--ink); }
.case-card .verified { color: #0b5d53; background: #dff2ec; }
.case-card .historical { color: #654b21; background: #fff3d8; }
.case-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 28px 0 38px; }
.case-summary div { border: 1px solid var(--line); border-radius: 14px; padding: 17px; background: #fff; }
.case-summary strong, .case-summary span { display: block; }
.case-summary span { color: var(--muted); font-size: 13px; margin-top: 4px; }
.case-detail-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 420px); gap: 42px; align-items: start; }
.evidence-figure { margin: 0; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: #fff; box-shadow: var(--shadow); }
.evidence-figure img { display: block; width: 100%; max-height: 900px; object-fit: contain; background: #f1f3f3; }
.evidence-figure figcaption { padding: 16px 18px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
.evidence-note { margin-top: 14px; color: var(--muted); font-size: 14px; }
.scope-list { display: grid; gap: 12px; padding: 0 !important; list-style: none; }
.scope-list li { border-left: 3px solid var(--accent); padding: 10px 0 10px 16px; color: #344c55; }
.reading-path { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: reading; }
.reading-path article { position: relative; padding-top: 56px; }
.reading-path article::before { counter-increment: reading; content: counter(reading); position: absolute; top: 20px; left: 24px; width: 27px; height: 27px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--brand); font-weight: 800; font-size: 13px; }
.credential-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.credential-card img { width: 100%; max-height: 560px; object-fit: contain; border: 1px solid var(--line); border-radius: 12px; background: #f2f4f3; }
.credential-card h3 { margin-top: 20px; }
.team-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.team-card { display: grid; grid-template-columns: 130px 1fr; gap: 22px; align-items: center; }
.team-card img { width: 130px; height: 150px; object-fit: cover; border-radius: 14px; background: var(--soft); }
.article-review { margin: 28px 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.article-review strong, .article-review span { display: block; }
.article-review span { color: var(--muted); font-size: 14px; }
details { border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 0 20px; }
details + details { margin-top: 12px; }
summary { cursor: pointer; font-weight: 700; padding: 18px 0; }
details p { color: var(--muted); padding-bottom: 18px; margin: 0; }

.cta-band { background: var(--ink); color: #fff; padding: 54px 0; }
.cta-wrap { display: flex; justify-content: space-between; gap: 30px; align-items: center; }
.cta-wrap h2 { margin-bottom: 8px; }
.cta-wrap p { color: rgba(255,255,255,.72); margin: 0; }
.site-footer { background: #10252d; color: rgba(255,255,255,.74); padding: 54px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr .7fr .9fr; gap: 42px; }
.site-footer h2, .site-footer h3 { color: #fff; font-size: 18px; }
.footer-links { display: grid; gap: 8px; }
.site-footer a { color: rgba(255,255,255,.78); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 36px; padding-top: 20px; font-size: 13px; }

@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .site-nav { display: none; position: absolute; top: 76px; left: 0; right: 0; background: #fff; padding: 20px; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; }
  .site-nav.open { display: flex; }
  .hero-grid, .content-layout, .footer-grid, .founder, .case-detail-grid { grid-template-columns: 1fr; }
  .facts-grid, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .case-summary, .reading-path { grid-template-columns: repeat(2, 1fr); }
  .sidebar { position: static; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .hero { padding: 64px 0 54px; }
  .section { padding: 60px 0; }
  .grid-2, .grid-3, .grid-4, .facts-grid, .case-fields, .evidence, .case-summary, .reading-path, .credential-grid, .team-grid, .team-card { grid-template-columns: 1fr; }
  .fact { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); }
  .cta-wrap { align-items: flex-start; flex-direction: column; }
  .brand span { display: none; }
}