:root {
  --bg: #0a0d10;
  --surface: #10151a;
  --surface-raised: #151b21;
  --surface-warm: #181713;
  --ink: #f0efe9;
  --muted: #9a9d9c;
  --faint: #696e70;
  --amber: #d7a94d;
  --amber-soft: #f0c977;
  --line: #2a3034;
  --line-strong: #42494d;
  --danger: #d98472;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Microsoft YaHei", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); line-height: 1.65; }
body.dialog-open { overflow: hidden; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--amber-soft); outline-offset: 3px; }

.site-header,
main,
.site-footer {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  min-height: 76px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 16, 0.95);
  backdrop-filter: blur(12px);
}

.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; }
.brand strong { font-size: 14px; letter-spacing: .12em; }
.brand span,
.terminal-link,
.site-header nav a,
.site-footer { color: var(--muted); font: 10px/1 var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.brand span { color: var(--amber); }
.site-header nav { display: flex; align-items: center; gap: 30px; }
.site-header nav a,
.terminal-link,
.site-footer a { text-decoration: none; transition: color .16s ease; }
.site-header nav a:hover,
.terminal-link:hover,
.site-footer a:hover { color: var(--amber-soft); }
.terminal-link { justify-self: end; }

.hero {
  min-height: 640px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
  gap: clamp(50px, 8vw, 120px);
  align-items: center;
  border-bottom: 1px solid var(--line);
}
.hero-copy { padding-block: 90px; }
.eyebrow,
.section-label { margin: 0 0 18px; color: var(--amber); font: 10px/1.4 var(--mono); letter-spacing: .15em; }
.hero h1 { max-width: 810px; margin: 0; font-size: clamp(48px, 6.4vw, 88px); font-weight: 560; letter-spacing: -.065em; line-height: 1.04; }
.hero h1 em { color: var(--amber-soft); font-style: normal; }
.hero-intro { max-width: 690px; margin: 30px 0 0; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 18px; border: 1px solid transparent; font: 11px/1 var(--mono); letter-spacing: .04em; text-decoration: none; transition: background .16s ease, border-color .16s ease, color .16s ease, transform .16s ease; }
.button:hover { transform: translateY(-1px); }
.button.primary { background: var(--amber); color: #17130a; }
.button.primary:hover { background: var(--amber-soft); }
.button.secondary { border-color: var(--line-strong); color: var(--ink); }
.button.secondary:hover { border-color: var(--amber); color: var(--amber-soft); }

.hero-ledger { align-self: center; border: 1px solid var(--line-strong); background: var(--surface); }
.ledger-heading { display: flex; align-items: center; justify-content: space-between; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.ledger-heading span { color: var(--muted); font: 10px/1 var(--mono); letter-spacing: .12em; }
.ledger-heading b { color: var(--amber-soft); font: 20px/1 var(--mono); }
.hero-ledger dl { margin: 0; }
.hero-ledger dl div { display: flex; justify-content: space-between; gap: 20px; padding: 15px 20px; border-bottom: 1px solid var(--line); }
.hero-ledger dt { color: var(--faint); font: 10px/1.4 var(--mono); }
.hero-ledger dd { margin: 0; color: var(--ink); font-size: 13px; text-align: right; }
.hero-ledger > p { margin: 0; padding: 18px 20px; color: var(--muted); font-size: 12px; }

.version-banner { display: grid; grid-template-columns: 145px 1fr; gap: 38px; align-items: center; margin-top: 38px; padding: 28px; border: 1px solid #4a412b; background: var(--surface-warm); }
.version-tag { align-self: stretch; display: grid; align-content: center; border-right: 1px solid #4a412b; }
.version-tag span { color: var(--muted); font: 9px/1 var(--mono); letter-spacing: .12em; }
.version-tag b { margin-top: 10px; color: var(--amber-soft); font: 30px/1 var(--mono); }
.version-banner h2 { margin: 0 0 8px; font-size: 24px; font-weight: 560; }
.version-banner p { max-width: 870px; margin-block: 0; color: var(--muted); font-size: 14px; }

.section { padding: 112px 0; }
.section-heading { display: grid; grid-template-columns: 1.05fr .95fr; align-items: end; gap: 70px; margin-bottom: 42px; }
.section-heading h2 { margin: 0; font-size: clamp(38px, 4.7vw, 62px); font-weight: 560; letter-spacing: -.055em; line-height: 1.08; }
.section-heading > p { max-width: 520px; margin: 0; color: var(--muted); font-size: 15px; }

.guide-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin: 0; padding: 1px; list-style: none; background: var(--line); }
.guide-grid li { min-height: 285px; padding: 27px; background: var(--surface); transition: background .16s ease; }
.guide-grid li:hover { background: var(--surface-raised); }
.guide-grid span,
.systems-grid span,
.patch-list span { color: var(--amber); font: 10px/1 var(--mono); letter-spacing: .1em; }
.guide-grid h3 { margin: 62px 0 13px; font-size: 22px; font-weight: 560; }
.guide-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.systems-section { width: 100vw; margin-left: calc(50% - 50vw); padding-inline: max(24px, calc((100vw - var(--max)) / 2)); border-block: 1px solid var(--line); background: #0d1115; }
.systems-section .section-heading,
.systems-section .systems-grid { width: min(100%, var(--max)); margin-inline: auto; }
.systems-section .section-heading { margin-bottom: 42px; }
.systems-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.systems-grid article { padding-top: 22px; border-top: 1px solid var(--line-strong); }
.systems-grid h3 { margin: 20px 0 10px; font-size: 19px; font-weight: 560; }
.systems-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.codex-section { padding-bottom: 74px; }
.content-counts { display: grid; grid-template-columns: repeat(5, 1fr); border-block: 1px solid var(--line); }
.content-counts div { min-width: 0; padding: 18px 16px; border-right: 1px solid var(--line); }
.content-counts div:nth-child(5n) { border-right: 0; }
.content-counts b,
.content-counts span { display: block; }
.content-counts b { color: var(--amber-soft); font: 24px/1 var(--mono); }
.content-counts span { margin-top: 7px; color: var(--muted); font-size: 12px; }

.codex-panel { margin-top: 26px; }
.codex-tools { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 28px; padding: 20px; border: 1px solid var(--line); background: var(--surface); }
.filter-group { min-width: 0; }
.class-filter-group { grid-column: 1; }
.tool-label { display: block; margin-bottom: 10px; color: var(--faint); font: 9px/1 var(--mono); letter-spacing: .12em; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 6px; }
.filter,
.class-filter,
.clear-filters,
.load-more { border: 1px solid var(--line-strong); background: transparent; color: var(--muted); font: 10px/1 var(--mono); transition: background .15s ease, border-color .15s ease, color .15s ease; }
.filter,
.class-filter { min-height: 36px; padding: 0 12px; }
.filter:hover,
.filter.active,
.class-filter:hover,
.class-filter.active { border-color: var(--amber); background: #282114; color: var(--amber-soft); }
.search { grid-column: 2; grid-row: 1 / span 2; align-self: stretch; min-width: 320px; display: grid; grid-template-columns: 1fr auto; align-content: center; gap: 9px 12px; padding: 14px 16px; border: 1px solid var(--line-strong); background: var(--bg); }
.search > span { grid-column: 1 / -1; color: var(--faint); font: 9px/1 var(--mono); letter-spacing: .1em; }
.search input { min-width: 0; width: 100%; border: 0; outline: 0; padding: 0; background: transparent; color: var(--ink); font-size: 14px; }
.search input::placeholder { color: #656b6e; }
.search kbd { align-self: center; min-width: 23px; padding: 4px 6px; border: 1px solid var(--line); color: var(--faint); font: 9px/1 var(--mono); text-align: center; }
.search:focus-within { border-color: var(--amber); }
.results-line { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.results-status { margin: 0; color: var(--muted); font: 10px/1.5 var(--mono); }
.clear-filters { border: 0; padding: 8px 0; }
.clear-filters:hover { color: var(--amber-soft); }

.codex-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.entry { min-width: 0; min-height: 205px; display: flex; flex-direction: column; padding: 19px; border: 1px solid var(--line); background: var(--surface); transition: border-color .15s ease, transform .15s ease; }
.entry:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.entry-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.entry-type,
.entry-tier { font: 9px/1 var(--mono); letter-spacing: .06em; }
.entry-type { color: var(--amber); }
.entry-tier { max-width: 62%; overflow: hidden; color: var(--faint); text-overflow: ellipsis; white-space: nowrap; }
.entry h3 { margin: 23px 0 9px; font-size: 19px; font-weight: 580; line-height: 1.25; }
.entry p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.62; }
.entry-meta { display: flex; flex-wrap: wrap; gap: 5px; margin-top: auto; padding-top: 20px; }
.entry-meta span { padding: 5px 7px; border: 1px solid var(--line); color: #8b8f8f; font: 9px/1 var(--mono); overflow-wrap: anywhere; }
.entry-id { margin-top: 13px; color: #565c5e; font: 8px/1.2 var(--mono); overflow-wrap: anywhere; }
.empty-results,
.data-error { grid-column: 1 / -1; padding: 54px 24px; border: 1px dashed var(--line-strong); color: var(--muted); text-align: center; }
.data-error strong { display: block; margin-bottom: 8px; color: var(--danger); }
.load-more { display: block; min-width: 180px; min-height: 44px; margin: 24px auto 0; padding: 0 18px; }
.load-more:hover { border-color: var(--amber); color: var(--amber-soft); }
.load-more[hidden] { display: none; }

.patch-detail { padding-top: 72px; }
.patch-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; padding: 1px; background: var(--line); }
.patch-list article { min-height: 220px; padding: 27px; background: var(--surface); }
.patch-list h3 { margin: 42px 0 12px; font-size: 21px; font-weight: 560; }
.patch-list p { margin: 0; color: var(--muted); font-size: 14px; }

.play-section { width: 100vw; margin-left: calc(50% - 50vw); padding: 105px max(24px, calc((100vw - var(--max)) / 2)); border-block: 1px solid #4a412b; background: var(--surface-warm); text-align: center; }
.play-section h2 { margin: 0; font-size: clamp(40px, 5vw, 66px); font-weight: 560; letter-spacing: -.055em; }
.play-section > p:not(.section-label) { max-width: 550px; margin: 17px auto 27px; color: var(--muted); }
.feedback-trigger { margin-inline: auto; }

.feedback-dialog { position: fixed; z-index: 30; inset: 0; display: grid; place-items: center; padding: 20px; visibility: hidden; opacity: 0; transition: opacity .2s ease, visibility .2s ease; }
.feedback-dialog.is-open { visibility: visible; opacity: 1; }
.dialog-backdrop { position: absolute; inset: 0; background: rgba(3, 5, 6, .82); backdrop-filter: blur(7px); }
.dialog-panel { position: relative; width: min(100%, 560px); padding: 40px; border: 1px solid var(--line-strong); background: var(--surface-raised); box-shadow: 0 28px 90px rgba(0, 0, 0, .55); transform: translateY(12px); transition: transform .2s ease; }
.feedback-dialog.is-open .dialog-panel { transform: translateY(0); }
.dialog-panel h2 { margin: 0; font-size: clamp(30px, 5vw, 42px); font-weight: 560; letter-spacing: -.04em; }
.dialog-panel > p:not(.section-label) { margin: 16px 0 24px; color: var(--muted); font-size: 14px; }
.dialog-close { position: absolute; top: 14px; right: 14px; border: 0; background: transparent; color: var(--muted); font: 10px/1 var(--mono); }
.dialog-close:hover { color: var(--amber-soft); }
.contact-list { border: 1px solid var(--line); }
.contact-list > div { padding: 15px 17px; }
.contact-list > div + div { border-top: 1px solid var(--line); }
.contact-list span { display: block; margin-bottom: 7px; color: var(--faint); font: 9px/1 var(--mono); letter-spacing: .08em; }
.copy-contact { width: 100%; border: 0; padding: 0; background: transparent; color: var(--amber-soft); font: 14px/1.4 var(--mono); text-align: left; }
.copy-contact::after { content: "复制"; float: right; color: var(--faint); font-size: 9px; }
.copy-notice { min-height: 19px; margin: 14px 0 0; color: var(--amber-soft); font: 10px/1.5 var(--mono); }
.copy-notice:empty { visibility: hidden; }

.site-footer { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 18px; color: var(--faint); }
.site-footer a { color: var(--muted); }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { display: none; }
  .hero { grid-template-columns: 1fr; gap: 0; padding-block: 70px; }
  .hero-copy { padding: 0 0 48px; }
  .hero-ledger { width: min(100%, 620px); }
  .guide-grid,
  .systems-grid { grid-template-columns: repeat(2, 1fr); }
  .content-counts { grid-template-columns: repeat(3, 1fr); }
  .content-counts div:nth-child(5n) { border-right: 1px solid var(--line); }
  .content-counts div:nth-child(3n) { border-right: 0; }
  .codex-grid { grid-template-columns: repeat(2, 1fr); }
  .codex-tools { grid-template-columns: 1fr; }
  .class-filter-group { grid-column: auto; }
  .search { grid-column: auto; grid-row: auto; min-width: 0; min-height: 86px; }
}

@media (max-width: 700px) {
  .site-header,
  main,
  .site-footer { width: min(calc(100% - 32px), var(--max)); }
  .site-header { min-height: 66px; }
  .brand span { display: none; }
  .terminal-link { font-size: 9px; }
  .hero { min-height: 0; padding-block: 60px; }
  .hero h1 { font-size: clamp(44px, 13vw, 64px); }
  .hero-intro { font-size: 15px; }
  .hero-actions { display: grid; }
  .version-banner { grid-template-columns: 1fr; gap: 20px; margin-top: 24px; }
  .version-tag { padding-bottom: 18px; border-right: 0; border-bottom: 1px solid #4a412b; }
  .section { padding: 78px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 17px; margin-bottom: 30px; }
  .guide-grid,
  .systems-grid,
  .codex-grid,
  .patch-list { grid-template-columns: 1fr; }
  .guide-grid li { min-height: 230px; }
  .guide-grid h3 { margin-top: 42px; }
  .systems-grid { gap: 20px; }
  .content-counts { grid-template-columns: repeat(2, 1fr); }
  .content-counts div:nth-child(3n) { border-right: 1px solid var(--line); }
  .content-counts div:nth-child(2n) { border-right: 0; }
  .codex-tools { padding: 15px; }
  .filter,
  .class-filter { flex: 1 1 auto; }
  .entry { min-height: 190px; }
  .play-section { padding-block: 78px; }
  .dialog-panel { padding: 34px 22px 22px; }
  .site-footer { min-height: 110px; flex-direction: column; justify-content: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}