:root {
  --ink: #182522;
  --ink-soft: #4d5d57;
  --paper: #f4f0e5;
  --paper-deep: #e7dfce;
  --pine: #153f38;
  --pine-light: #2f665b;
  --cinnabar: #b3472f;
  --gold: #c49b57;
  --line: rgba(24, 37, 34, .16);
  --shadow: 0 18px 60px rgba(27, 42, 37, .10);
  --radius: 4px;
  --font-serif: "Noto Serif SC", "Songti SC", SimSun, serif;
  --font-sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 4%, rgba(196,155,87,.12), transparent 26rem),
    linear-gradient(rgba(244,240,229,.96), rgba(244,240,229,.96)),
    repeating-linear-gradient(90deg, transparent 0 7px, rgba(24,37,34,.025) 8px);
  font-family: var(--font-sans);
  line-height: 1.75;
}

a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }
img { max-width: 100%; }
.skip-link { position: absolute; left: -999px; top: .5rem; z-index: 100; background: var(--paper); padding: .6rem 1rem; }
.skip-link:focus { left: .75rem; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(244,240,229,.9);
  backdrop-filter: blur(14px);
}
.header-inner { width: min(1180px, calc(100% - 2rem)); min-height: 74px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: flex; align-items: center; gap: .85rem; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid var(--cinnabar); color: var(--cinnabar); font-family: var(--font-serif); font-size: 1.1rem; transform: rotate(45deg); }
.brand-mark span { transform: rotate(-45deg); }
.brand-copy strong { display: block; font-family: var(--font-serif); letter-spacing: .1em; line-height: 1.2; }
.brand-copy small { display: block; margin-top: .15rem; color: var(--ink-soft); font-size: .68rem; letter-spacing: .12em; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-size: .9rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--cinnabar); }
.menu-button { display: none; padding: .45rem .7rem; border: 1px solid var(--line); background: transparent; color: var(--ink); font: inherit; }

main { overflow: hidden; }
.container { width: min(1180px, calc(100% - 2rem)); margin-inline: auto; }
.eyebrow { display: flex; align-items: center; gap: .8rem; color: var(--cinnabar); font-size: .72rem; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 34px; height: 1px; background: currentColor; }
.hero { min-height: 690px; display: grid; align-items: center; position: relative; }
.hero::after { content: "山\A海\A经"; white-space: pre; position: absolute; right: 4vw; top: 8%; color: rgba(21,63,56,.055); font: 700 clamp(8rem, 18vw, 18rem)/.86 var(--font-serif); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 4rem; padding: 5rem 0; }
.hero h1, .page-hero h1 { margin: 1rem 0 1.4rem; font: 500 clamp(3.2rem, 7vw, 6.8rem)/1.02 var(--font-serif); letter-spacing: -.05em; }
.hero h1 em { display: block; color: var(--cinnabar); font-style: normal; }
.hero-lead { max-width: 38rem; color: var(--ink-soft); font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .65rem 1.25rem; border: 1px solid var(--pine); color: var(--paper); background: var(--pine); text-decoration: none; font-size: .9rem; letter-spacing: .08em; transition: .2s ease; }
.button:hover { background: var(--pine-light); transform: translateY(-2px); }
.button.secondary { color: var(--pine); background: transparent; }
.button.secondary:hover { color: var(--paper); background: var(--pine); }
.seal-note { margin-top: 1.4rem; color: var(--ink-soft); font-size: .78rem; }

.mountain-window { aspect-ratio: 4/5; max-width: 460px; justify-self: end; position: relative; border: 1px solid var(--line); background: linear-gradient(155deg, #dce1d7 0 45%, #9baea4 45% 55%, #315d55 55% 75%, #183b35 75%); box-shadow: var(--shadow); overflow: hidden; }
.mountain-window::before, .mountain-window::after { content: ""; position: absolute; width: 80%; aspect-ratio: 1; border-radius: 50%; border: 1px solid rgba(244,240,229,.4); }
.mountain-window::before { left: -35%; top: 12%; }
.mountain-window::after { right: -40%; bottom: -5%; }
.vertical-title { position: absolute; right: 1.6rem; top: 1.6rem; writing-mode: vertical-rl; color: rgba(244,240,229,.9); font: 500 1.3rem/1.5 var(--font-serif); letter-spacing: .35em; }
.specimen { position: absolute; left: 1.8rem; bottom: 1.8rem; color: var(--paper); }
.specimen strong { display: block; font: 500 2rem var(--font-serif); }
.specimen small { opacity: .76; letter-spacing: .12em; }

.section { padding: 6.5rem 0; }
.section.dark { color: var(--paper); background: var(--pine); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 2rem; margin-bottom: 2.4rem; }
.section-head h2 { margin: .5rem 0 0; font: 500 clamp(2rem, 4vw, 3.6rem)/1.15 var(--font-serif); }
.section-head p { max-width: 36rem; margin: 0; color: var(--ink-soft); }
.dark .section-head p { color: rgba(244,240,229,.68); }

.grade-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.grade { min-height: 200px; padding: 1.5rem; background: var(--paper); }
.grade-code, .source-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 28px; padding: 0 .6rem; color: var(--paper); background: var(--pine); font-size: .72rem; font-weight: 800; letter-spacing: .08em; }
.grade h3 { margin: 2rem 0 .45rem; font: 500 1.2rem var(--font-serif); }
.grade p { margin: 0; color: var(--ink-soft); font-size: .84rem; line-height: 1.65; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.creature-card { min-height: 420px; position: relative; display: flex; flex-direction: column; justify-content: end; padding: 1.6rem; border: 1px solid rgba(244,240,229,.18); color: var(--paper); text-decoration: none; overflow: hidden; }
.creature-card::before { content: attr(data-glyph); position: absolute; left: 50%; top: 43%; transform: translate(-50%,-50%); color: rgba(244,240,229,.09); font: 700 11rem var(--font-serif); transition: .4s ease; }
.creature-card:hover::before { transform: translate(-50%,-50%) scale(1.08); color: rgba(196,155,87,.18); }
.card-number { position: absolute; top: 1.4rem; right: 1.4rem; color: var(--gold); font-size: .75rem; letter-spacing: .16em; }
.creature-card h3 { margin: 0; font: 500 2.2rem var(--font-serif); }
.creature-card p { margin: .55rem 0 0; color: rgba(244,240,229,.68); font-size: .88rem; }
.card-arrow { margin-top: 1.2rem; color: var(--gold); }

.intro-band { display: grid; grid-template-columns: .85fr 1.15fr; gap: 5rem; align-items: start; }
.intro-band h2 { margin: 0; font: 500 clamp(2.2rem, 4vw, 4rem)/1.15 var(--font-serif); }
.intro-band p { margin-top: 0; color: var(--ink-soft); }
.principle-list { display: grid; gap: .8rem; margin-top: 1.5rem; }
.principle { display: flex; gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--line); }
.principle span { color: var(--cinnabar); font-weight: 700; }

.page-hero { padding: 6.5rem 0 4rem; border-bottom: 1px solid var(--line); }
.page-hero.compact { padding-bottom: 2.5rem; }
.page-hero h1 { font-size: clamp(3rem, 7vw, 6rem); }
.page-hero p { max-width: 48rem; color: var(--ink-soft); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .5rem; color: var(--ink-soft); font-size: .78rem; }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { color: var(--cinnabar); }

.hall-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; margin-bottom: 2rem; }
.filter-group { display: flex; flex-wrap: wrap; gap: .5rem; }
.filter-button { min-height: 40px; padding: .4rem .9rem; border: 1px solid var(--line); color: var(--ink-soft); background: transparent; font: inherit; font-size: .82rem; cursor: pointer; }
.filter-button.active, .filter-button:hover { color: var(--paper); border-color: var(--pine); background: var(--pine); }
.collection-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.collection-item { display: flex; min-height: 360px; flex-direction: column; padding: 1.5rem; border: 1px solid var(--line); background: rgba(255,255,255,.18); text-decoration: none; box-shadow: 0 0 0 rgba(0,0,0,0); transition: .2s ease; }
.collection-item:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.collection-visual { min-height: 170px; display: grid; place-items: center; margin-bottom: 1.4rem; color: var(--pine); background: var(--paper-deep); font: 700 5rem var(--font-serif); }
.collection-topline { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .55rem; font-size: .7rem; letter-spacing: .1em; }
.collection-type { color: var(--ink-soft); }
.collection-status { color: var(--cinnabar); }
.collection-item h2 { margin: 0; font: 500 1.7rem var(--font-serif); }
.collection-item p { color: var(--ink-soft); font-size: .86rem; }
.collection-meta { display: flex; justify-content: space-between; gap: 1rem; margin-top: auto; color: var(--cinnabar); font-size: .75rem; letter-spacing: .08em; }
.collection-action { width: 100%; margin-top: 1rem; padding: .75rem .2rem; border: 0; border-top: 1px solid var(--line); color: var(--pine); background: transparent; font: 600 .78rem var(--font-sans); letter-spacing: .08em; text-align: left; text-decoration: none; cursor: pointer; }
.collection-action:hover { color: var(--cinnabar); }
.collection-loader, .data-error { grid-column: 1 / -1; padding: 2.5rem; border: 1px dashed var(--line); color: var(--ink-soft); text-align: center; }

.preview-dialog { width: min(720px, calc(100% - 2rem)); max-height: min(82vh, 820px); padding: 0; border: 1px solid var(--line); color: var(--ink); background: var(--paper); box-shadow: 0 24px 100px rgba(11,32,28,.3); }
.preview-dialog::backdrop { background: rgba(10,28,24,.68); backdrop-filter: blur(4px); }
.preview-dialog[open] { display: block; }
.preview-dialog-inner { position: relative; padding: clamp(1.4rem, 4vw, 3rem); }
.preview-close { position: sticky; float: right; top: 0; z-index: 1; width: 42px; height: 42px; border: 1px solid var(--line); color: var(--ink); background: var(--paper); font: 1.2rem var(--font-sans); cursor: pointer; }
.preview-summary { max-width: 34rem; color: var(--ink-soft); }
.preview-dialog h2 { margin: .7rem 0; font: 500 clamp(2.4rem, 8vw, 4.5rem) var(--font-serif); }
.preview-evidence { margin-top: 2rem; border-top: 1px solid var(--line); }
.preview-layer { display: grid; grid-template-columns: 56px 1fr; gap: 1rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.preview-layer p { margin: .15rem 0; color: var(--ink-soft); font-size: .84rem; }
.preview-layer blockquote { margin: .7rem 0; font-family: var(--font-serif); }
.source-link { color: var(--cinnabar); font-size: .75rem; text-underline-offset: 3px; }

.method-intro { max-width: 52rem; margin: 0 0 3rem; color: var(--ink-soft); font: 500 clamp(1.15rem, 2vw, 1.45rem)/1.8 var(--font-serif); }
.method-levels { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.method-level { padding: 1.5rem; border: 1px solid var(--line); background: rgba(255,255,255,.18); }
.method-level:last-child { grid-column: 1 / -1; }
.method-level p { color: var(--ink-soft); }
.method-rule { padding-top: .8rem; border-top: 1px solid var(--line); color: var(--cinnabar); font-size: .8rem; }
.method-section-title { margin: 5rem 0 1.5rem; font: 500 clamp(2rem, 4vw, 3rem) var(--font-serif); }
.workflow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.workflow-item { padding: 1.4rem; background: var(--paper); }
.workflow-step { color: var(--gold); font-size: .72rem; letter-spacing: .16em; }
.workflow-item h3 { margin: 1.5rem 0 .5rem; font: 500 1.15rem var(--font-serif); }
.workflow-item p { margin: 0; color: var(--ink-soft); font-size: .82rem; }

.creature-layout { display: grid; grid-template-columns: 270px minmax(0,1fr); gap: 4rem; align-items: start; padding: 4.5rem 0 7rem; }
.creature-aside { position: sticky; top: 98px; }
.creature-emblem { aspect-ratio: 1; display: grid; place-items: center; margin-bottom: 1.3rem; color: var(--paper); background: var(--pine); font: 500 7rem var(--font-serif); }
.fact-list { margin: 0; }
.fact-list div { padding: .8rem 0; border-bottom: 1px solid var(--line); }
.fact-list dt { color: var(--ink-soft); font-size: .7rem; letter-spacing: .12em; }
.fact-list dd { margin: .2rem 0 0; font-size: .88rem; }
.source-section { padding: 0 0 3.3rem; margin-bottom: 3.3rem; border-bottom: 1px solid var(--line); scroll-margin-top: 110px; }
.source-section:last-child { border-bottom: 0; }
.source-heading { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.3rem; }
.source-heading h2 { margin: 0; font: 500 1.7rem var(--font-serif); }
.source-section blockquote { margin: 0; padding: 1.4rem 1.6rem; border-left: 3px solid var(--cinnabar); background: rgba(255,255,255,.22); font: 500 1.15rem/2 var(--font-serif); }
.source-section p { color: var(--ink-soft); }
.source-ref { display: block; margin-top: 1rem; color: var(--ink-soft); font-size: .75rem; }
.source-ref a { color: var(--cinnabar); text-underline-offset: 3px; }
.notice { padding: 1rem 1.2rem; border: 1px dashed var(--gold); color: var(--ink-soft); background: rgba(196,155,87,.08); font-size: .84rem; }
.research-list { padding-left: 1.2rem; color: var(--ink-soft); }
.research-list li + li { margin-top: .65rem; }

.data-note { display: flex; align-items: start; gap: 1rem; padding: 1.2rem; border: 1px solid var(--line); background: rgba(255,255,255,.2); }
.data-dot { flex: 0 0 auto; width: 10px; height: 10px; margin-top: .55rem; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 5px rgba(196,155,87,.15); }
.data-note strong { display: block; }
.data-note p { margin: .25rem 0 0; color: var(--ink-soft); font-size: .82rem; }

.site-footer { padding: 3rem 0; color: rgba(244,240,229,.72); background: #102e29; }
.footer-grid { display: flex; justify-content: space-between; align-items: end; gap: 2rem; }
.footer-title { color: var(--paper); font: 500 1.2rem var(--font-serif); }
.footer-small { max-width: 40rem; margin: .5rem 0 0; font-size: .75rem; }
.version { color: var(--gold); font-size: .72rem; letter-spacing: .14em; }

[hidden] { display: none !important; }
@media (max-width: 850px) {
  .menu-button { display: block; }
  .nav-links { position: absolute; left: 1rem; right: 1rem; top: 66px; display: none; padding: 1rem; border: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
  .nav-links.open { display: grid; gap: .7rem; }
  .hero { min-height: auto; }
  .hero-grid, .intro-band, .creature-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .mountain-window { width: min(100%, 440px); justify-self: start; }
  .grade-grid { grid-template-columns: repeat(2,1fr); }
  .cards, .collection-grid { grid-template-columns: 1fr; }
  .workflow-grid { grid-template-columns: repeat(2, 1fr); }
  .creature-aside { position: static; display: grid; grid-template-columns: 180px 1fr; gap: 1.5rem; }
  .section-head { display: block; }
  .section-head p { margin-top: 1rem; }
}
@media (max-width: 560px) {
  .container, .header-inner { width: min(100% - 1.25rem, 1180px); }
  .brand-copy small { display: none; }
  .hero-grid { padding: 3.5rem 0; }
  .hero h1 { font-size: 3.35rem; }
  .hero-actions .button { width: 100%; }
  .section { padding: 4.5rem 0; }
  .grade-grid { grid-template-columns: 1fr; }
  .method-levels, .workflow-grid { grid-template-columns: 1fr; }
  .method-level:last-child { grid-column: auto; }
  .grade { min-height: auto; }
  .grade h3 { margin-top: 1rem; }
  .page-hero { padding-top: 4rem; }
  .creature-layout { padding-top: 2.5rem; }
  .creature-aside { grid-template-columns: 1fr; }
  .creature-emblem { aspect-ratio: 2/1; }
  .source-section blockquote { padding: 1rem; font-size: 1rem; }
  .preview-layer { grid-template-columns: 44px 1fr; }
  .footer-grid { display: block; }
  .version { display: block; margin-top: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}