:root {
  --page-ink: #17171b;
  --page-paper: #f3f0ea;
  --page-white: #fbfaf7;
  --page-line: #d8d2c6;
  --page-muted: #6f7078;
  --page-red: #a92f32;
  --page-red-dark: #842326;
  --page-gold: #ad9063;
  --page-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --page-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --page-max: 1180px;
  --page-radius: 3px;
  --page-ease: cubic-bezier(.16, 1, .3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--page-ink);
  background: var(--page-paper);
  font-family: var(--page-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
.skip-link { position: fixed; top: -5rem; left: 1rem; z-index: 99; padding: .7rem 1rem; background: var(--page-ink); color: var(--page-white); }
.skip-link:focus { top: 1rem; }

.page-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 240, 234, .92);
  border-bottom: 1px solid rgba(23, 23, 27, .08);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.page-nav-inner {
  width: min(var(--page-max), calc(100% - 2.5rem));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.page-brand { font-family: var(--page-serif); font-weight: 600; letter-spacing: .12em; white-space: nowrap; }
.page-nav-links { display: flex; align-items: center; gap: 1.35rem; font-size: .8rem; color: var(--page-muted); }
.page-nav-links a:hover, .text-link:hover { color: var(--page-red); }
.page-nav-cta, .page-cta-primary, .page-cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: .72rem 1.25rem;
  border-radius: var(--page-radius);
  font-size: .84rem;
  font-weight: 600;
  transition: transform .25s var(--page-ease), background .25s, color .25s, border-color .25s;
}
.page-nav-cta, .page-cta-primary { background: var(--page-red); color: var(--page-white); }
.page-nav-cta:hover, .page-cta-primary:hover { background: var(--page-red-dark); transform: translateY(-2px); }
.page-cta-secondary { border: 1px solid rgba(251, 250, 247, .5); color: var(--page-white); }
.page-cta-secondary:hover { border-color: var(--page-white); transform: translateY(-2px); }

.page-hero {
  position: relative;
  min-height: min(820px, 88dvh);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--page-white);
  background: #252329;
}
.page-hero-media { position: absolute; inset: 0; }
.page-hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center 22%; }
.page-hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,9,12,.88) 0%, rgba(10,9,12,.54) 48%, rgba(10,9,12,.18) 100%), linear-gradient(0deg, rgba(10,9,12,.72), transparent 55%); }
.page-hero-inner { position: relative; z-index: 2; width: min(var(--page-max), calc(100% - 2.5rem)); margin: 0 auto; padding: 7rem 0 5.5rem; }
.page-kicker { margin: 0 0 1rem; color: #dcc59c; font-size: .74rem; letter-spacing: .16em; }
.page-hero h1 { max-width: 760px; margin: 0; font-family: var(--page-serif); font-size: clamp(2.45rem, 7vw, 5.8rem); line-height: 1.13; letter-spacing: .035em; font-weight: 600; }
.page-hero-lead { max-width: 650px; margin: 1.35rem 0 0; font-size: clamp(1rem, 2vw, 1.22rem); color: rgba(251,250,247,.84); }
.page-hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.page-proof-line { margin-top: 2rem; max-width: 760px; padding-top: 1.1rem; border-top: 1px solid rgba(255,255,255,.22); color: rgba(251,250,247,.72); font-size: .82rem; }

.page-section { padding: clamp(4.5rem, 9vw, 8rem) 0; }
.page-section-white { background: var(--page-white); }
.page-section-dark { background: #1c1b20; color: var(--page-white); }
.page-container { width: min(var(--page-max), calc(100% - 2.5rem)); margin: 0 auto; }
.page-heading { max-width: 760px; margin-bottom: 3rem; }
.page-heading h2 { margin: 0; font-family: var(--page-serif); font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.25; letter-spacing: .025em; }
.page-heading p { max-width: 62ch; margin: 1rem 0 0; color: var(--page-muted); }
.page-section-dark .page-heading p { color: rgba(251,250,247,.66); }

.feature-mosaic { display: grid; grid-template-columns: 1.2fr .8fr; gap: 1rem; }
.feature-panel { min-height: 250px; padding: clamp(1.6rem, 4vw, 3rem); border: 1px solid var(--page-line); background: rgba(251,250,247,.42); }
.feature-panel:first-child { grid-row: span 2; min-height: 520px; display: flex; flex-direction: column; justify-content: flex-end; background: linear-gradient(180deg, rgba(23,23,27,.03), rgba(169,47,50,.09)); }
.feature-panel h3 { margin: 0; font-family: var(--page-serif); font-size: clamp(1.35rem, 2.8vw, 2rem); }
.feature-panel p { margin: .75rem 0 0; color: var(--page-muted); }
.feature-number { display: block; margin-bottom: auto; font-family: var(--page-serif); font-size: clamp(3rem, 8vw, 6.5rem); line-height: 1; color: var(--page-red); }

.service-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid rgba(251,250,247,.23); }
.flow-item { padding: 2rem 1.4rem 1rem 0; border-right: 1px solid rgba(251,250,247,.15); }
.flow-item:last-child { border-right: 0; padding-right: 0; }
.flow-item strong { display: block; margin-bottom: .7rem; font-family: var(--page-serif); font-size: 1.15rem; }
.flow-item span { color: rgba(251,250,247,.62); font-size: .88rem; }

.image-story { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(2rem, 6vw, 6rem); align-items: center; }
.image-story-media { min-height: 560px; overflow: hidden; background: #ddd7cd; }
.image-story-media img { height: 100%; min-height: 560px; object-fit: cover; }
.image-story-copy h2 { margin: 0; font-family: var(--page-serif); font-size: clamp(2rem, 4vw, 3.8rem); line-height: 1.25; }
.image-story-copy p { color: var(--page-muted); }
.detail-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem 2rem; margin: 2rem 0 0; padding: 0; list-style: none; }
.detail-list li { padding-top: 1rem; border-top: 1px solid var(--page-line); font-size: .9rem; }
.detail-list strong { display: block; margin-bottom: .25rem; color: var(--page-ink); }

.faq-list { max-width: 900px; }
.faq-item { border-top: 1px solid var(--page-line); padding: 1.45rem 0; }
.faq-item:last-child { border-bottom: 1px solid var(--page-line); }
.faq-item h3 { margin: 0; font-family: var(--page-serif); font-size: 1.1rem; }
.faq-item p { margin: .6rem 0 0; color: var(--page-muted); }

.related-grid { display: grid; grid-template-columns: 1.3fr .7fr 1fr; gap: 1rem; }
.related-card { min-height: 230px; padding: 2rem; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid rgba(251,250,247,.18); background: rgba(255,255,255,.035); }
.related-card h3 { margin: 0; font-family: var(--page-serif); font-size: 1.35rem; }
.related-card p { color: rgba(251,250,247,.58); font-size: .86rem; }
.related-card a { color: #dcc59c; font-size: .84rem; }

.honor-feature { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.honor-feature + .honor-feature { margin-top: 7rem; }
.honor-feature:nth-child(even) .honor-media { order: 2; }
.honor-media img { aspect-ratio: 4 / 3; object-fit: cover; border: 1px solid var(--page-line); }
.honor-copy h2 { margin: 0; font-family: var(--page-serif); font-size: clamp(1.8rem, 3.7vw, 3rem); line-height: 1.3; }
.honor-copy p { color: var(--page-muted); }
.honor-meta { margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--page-line); font-size: .8rem; color: var(--page-muted); }
.source-links { display: flex; flex-wrap: wrap; gap: .7rem 1.2rem; margin-top: 1.2rem; }
.text-link { color: var(--page-red); text-decoration: underline; text-underline-offset: 4px; }

.ranking-panel { padding: clamp(2rem, 5vw, 4.5rem); background: #1c1b20; color: var(--page-white); }
.ranking-panel h2 { margin: 0; max-width: 920px; font-family: var(--page-serif); font-size: clamp(2rem, 4.5vw, 4rem); line-height: 1.3; }
.ranking-panel p { max-width: 720px; color: rgba(251,250,247,.65); }
.ranking-images { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.ranking-images img { height: 100%; object-fit: cover; border: 1px solid rgba(255,255,255,.14); }

.guide-hero .page-hero-inner { max-width: var(--page-max); }
.guide-hero h1 { max-width: 960px; font-size: clamp(2.4rem, 6.2vw, 5.3rem); }
.decision-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; }
.decision-item { grid-column: span 4; min-height: 250px; padding: 2rem; border: 1px solid var(--page-line); background: rgba(251,250,247,.5); }
.decision-item span { display: block; margin-bottom: 3.5rem; color: var(--page-red); font-family: var(--page-serif); font-size: 1.1rem; }
.decision-item h3 { margin: 0; font-family: var(--page-serif); font-size: 1.35rem; }
.decision-item p { color: var(--page-muted); font-size: .9rem; }
.decision-item-feature { grid-column: span 8; background: linear-gradient(135deg, rgba(169,47,50,.1), rgba(173,144,99,.08)); }
.proof-ledger { border-top: 1px solid rgba(251,250,247,.2); }
.proof-row { display: grid; grid-template-columns: minmax(160px,.35fr) 1fr; gap: 2rem; padding: 1.5rem 0; border-bottom: 1px solid rgba(251,250,247,.14); }
.proof-row strong { color: #dcc59c; font-family: var(--page-serif); font-size: 1.25rem; }
.proof-row p { max-width: 720px; margin: 0; color: rgba(251,250,247,.66); }
.authority-strip { display: grid; grid-template-columns: 1.35fr .65fr; gap: 1rem; }
.authority-main { grid-row: span 3; padding: clamp(2rem,5vw,4rem); border: 1px solid var(--page-line); background: linear-gradient(150deg, rgba(169,47,50,.09), transparent 70%); }
.authority-main h3 { margin: .5rem 0 1rem; font-family: var(--page-serif); font-size: clamp(2rem,4vw,3.4rem); line-height: 1.3; }
.authority-main p, .authority-note p { color: var(--page-muted); }
.authority-note { padding: 1.7rem; border: 1px solid var(--page-line); background: rgba(251,250,247,.45); }
.authority-note h3 { margin: 0; font-family: var(--page-serif); font-size: 1.15rem; }
.identity-card { padding: clamp(1.5rem,4vw,3.5rem); border: 1px solid rgba(251,250,247,.18); background: rgba(255,255,255,.035); }
.identity-card dl { margin: 0; }
.identity-card dl > div { display: grid; grid-template-columns: 180px 1fr; gap: 1.5rem; padding: 1rem 0; border-bottom: 1px solid rgba(251,250,247,.12); }
.identity-card dl > div:last-child { border-bottom: 0; }
.identity-card dt { color: #dcc59c; }
.identity-card dd { margin: 0; color: rgba(251,250,247,.76); overflow-wrap: anywhere; }

.identity-hero { min-height: min(760px, 82dvh); }
.identity-hero h1 { max-width: 900px; font-size: clamp(2.4rem, 6vw, 5.2rem); }
.identity-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.identity-intro { position: sticky; top: 110px; }
.identity-intro h2, .identity-proof-copy h2 { margin: 0; font-family: var(--page-serif); font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.28; }
.identity-intro p:not(.page-kicker), .identity-proof-copy p { color: rgba(251,250,247,.66); }
.identity-card-primary { background: linear-gradient(145deg, rgba(255,255,255,.07), rgba(169,47,50,.08)); }
.official-link-ledger { border-top: 1px solid var(--page-line); }
.official-link-row { display: grid; grid-template-columns: 150px 1fr auto; gap: 1.5rem; align-items: center; padding: 1.4rem 0; border-bottom: 1px solid var(--page-line); transition: color .25s var(--page-ease), padding-left .25s var(--page-ease); }
.official-link-row:hover { color: var(--page-red); padding-left: .5rem; }
.official-link-row span { color: var(--page-muted); font-size: .82rem; }
.official-link-row strong { font-family: var(--page-serif); font-size: 1.08rem; font-weight: 500; }
.official-link-row em { color: var(--page-red); font-size: .76rem; font-style: normal; }
.identity-proof { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 7vw, 7rem); align-items: center; }
.identity-proof-copy p { color: var(--page-muted); }
.identity-facts { border-top: 1px solid var(--page-line); }
.identity-facts > div { display: grid; grid-template-columns: 160px 1fr; gap: 1.5rem; align-items: baseline; padding: 1.35rem 0; border-bottom: 1px solid var(--page-line); }
.identity-facts strong { font-family: var(--page-serif); color: var(--page-red); font-size: 1.45rem; }
.identity-facts span { color: var(--page-muted); }
.identity-faq .faq-item { border-color: rgba(251,250,247,.16); }
.identity-faq .faq-item h3 { color: var(--page-white); }
.identity-faq .faq-item p { color: rgba(251,250,247,.66); }

.page-final { text-align: center; }
.page-final h2 { max-width: 820px; margin: 0 auto; font-family: var(--page-serif); font-size: clamp(2rem, 4.5vw, 4rem); line-height: 1.25; }
.page-final p { max-width: 620px; margin: 1rem auto 0; color: var(--page-muted); }
.page-final .page-hero-actions { justify-content: center; }
.page-final .page-cta-secondary { color: var(--page-ink); border-color: var(--page-line); }

.page-footer { padding: 3rem 0; background: #151419; color: rgba(251,250,247,.62); }
.page-footer-inner { width: min(var(--page-max), calc(100% - 2.5rem)); margin: 0 auto; display: grid; grid-template-columns: 1fr auto; gap: 1rem 2rem; align-items: end; }
.page-footer-brand { font-family: var(--page-serif); color: var(--page-white); letter-spacing: .1em; }
.page-footer-links { display: flex; flex-wrap: wrap; gap: 1rem; font-size: .78rem; }
.page-footer small { grid-column: 1 / -1; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.1); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--page-ease), transform .7s var(--page-ease); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .page-nav-links { display: none; }
  .feature-mosaic, .image-story, .honor-feature { grid-template-columns: 1fr; }
  .feature-panel:first-child { grid-row: auto; min-height: 360px; }
  .honor-feature:nth-child(even) .honor-media { order: 0; }
  .service-flow { grid-template-columns: 1fr 1fr; }
  .flow-item:nth-child(2) { border-right: 0; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .related-card:first-child { grid-column: 1 / -1; }
  .decision-item { grid-column: span 6; }
  .decision-item-feature { grid-column: span 12; }
  .authority-strip { grid-template-columns: 1fr; }
  .authority-main { grid-row: auto; }
  .identity-layout, .identity-proof { grid-template-columns: 1fr; }
  .identity-intro { position: static; }
}

@media (max-width: 640px) {
  .page-nav-inner, .page-container, .page-hero-inner, .page-footer-inner { width: min(100% - 2rem, var(--page-max)); }
  .page-nav-cta { padding: .62rem .8rem; min-height: 40px; }
  .page-hero { min-height: 82dvh; }
  .page-hero-media::after { background: linear-gradient(0deg, rgba(10,9,12,.88), rgba(10,9,12,.3) 75%); }
  .page-hero-inner { padding: 6rem 0 3.5rem; }
  .page-hero h1 { font-size: clamp(2.35rem, 12vw, 3.5rem); }
  .page-hero-actions { display: grid; grid-template-columns: 1fr; }
  .feature-mosaic, .service-flow, .detail-list, .related-grid, .ranking-images { grid-template-columns: 1fr; }
  .flow-item { border-right: 0; border-bottom: 1px solid rgba(251,250,247,.15); padding: 1.4rem 0; }
  .image-story-media, .image-story-media img { min-height: 420px; }
  .related-card:first-child { grid-column: auto; }
  .page-footer-inner { grid-template-columns: 1fr; }
  .decision-item, .decision-item-feature { grid-column: 1 / -1; min-height: auto; }
  .decision-item span { margin-bottom: 2rem; }
  .proof-row, .identity-card dl > div { grid-template-columns: 1fr; gap: .45rem; }
  .official-link-row, .identity-facts > div { grid-template-columns: 1fr; gap: .35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .page-nav-cta, .page-cta-primary, .page-cta-secondary { transition: none; }
}