:root {
  color-scheme: dark;
  --ink: #f5f1e8;
  --muted: #b8c2d9;
  --night: #070b18;
  --panel: #10182d;
  --panel-soft: #151f38;
  --line: #334466;
  --gold: #e7b75f;
  --cyan: #7bd8d2;
  --violet: #9d8cff;
  --danger: #ff9b94;
  --max: 1180px;
  --radius: 18px;
}
* { box-sizing: border-box; }
html { background: var(--night); scroll-behavior: smooth; }
body { margin: 0; min-width: 0; overflow-x: hidden; background: radial-gradient(circle at 78% -10%, #26335e 0, transparent 31rem), var(--night); color: var(--ink); font-family: ui-serif, Georgia, "Times New Roman", "Noto Serif CJK SC", serif; line-height: 1.72; }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .25; background-image: radial-gradient(circle, #fff 0 1px, transparent 1.4px); background-size: 43px 43px; mask-image: linear-gradient(to bottom, #000, transparent 70%); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { color: var(--cyan); }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
code { overflow-wrap: anywhere; color: var(--cyan); }
.skip-link { position: fixed; z-index: 99; left: 1rem; top: -5rem; padding: .65rem 1rem; background: var(--gold); color: var(--night); border-radius: .5rem; }
.skip-link:focus { top: 1rem; }
.site-header { position: relative; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(7, 11, 24, .92); backdrop-filter: blur(18px); }
.masthead, .nav-tier, main, .site-footer { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.masthead { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; font-weight: 700; letter-spacing: .06em; }
.brand-mark { display: grid; place-items: center; width: 2.35rem; aspect-ratio: 1; border: 1px solid var(--gold); color: var(--gold); border-radius: 50%; font: 700 .78rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.nav-toggle { display: none; align-items: center; gap: .45rem; border: 1px solid var(--line); border-radius: 999px; padding: .48rem .78rem; background: var(--panel); color: var(--ink); cursor: pointer; }
.two-tier-nav { border-top: 1px solid rgba(51, 68, 102, .7); }
.nav-tier { display: flex; align-items: center; gap: clamp(.7rem, 1.8vw, 1.35rem); min-height: 44px; overflow-x: auto; scrollbar-width: none; }
.nav-tier + .nav-tier { border-top: 1px dashed rgba(51, 68, 102, .6); }
.nav-tier a { flex: 0 0 auto; text-decoration: none; color: var(--muted); font: 600 .78rem ui-sans-serif, system-ui, sans-serif; letter-spacing: .025em; }
.nav-tier a:hover, .nav-tier a:focus-visible { color: var(--cyan); }
.tier-label { flex: 0 0 auto; color: var(--gold); font: 700 .65rem ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .15em; text-transform: uppercase; }
main { position: relative; min-width: 0; }
.hero { min-height: 640px; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr); align-items: center; gap: clamp(2rem, 7vw, 6rem); padding: clamp(4.5rem, 9vw, 8rem) 0; }
.eyebrow, .section-kicker, .file-meta, .aside-label { margin: 0 0 .8rem; color: var(--gold); font: 700 .72rem ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .16em; text-transform: uppercase; }
h1, h2 { text-wrap: balance; }
h1 { margin: 0; font-size: clamp(2.75rem, 8vw, 7rem); line-height: .98; letter-spacing: -.055em; }
h2 { line-height: 1.2; letter-spacing: -.025em; }
.hero-lead { max-width: 44rem; margin: 2rem 0 0; color: #d9dfee; font-size: clamp(1.05rem, 2.2vw, 1.35rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin: 2rem 0 1.2rem; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; border-radius: 999px; padding: .65rem 1.2rem; border: 1px solid var(--line); text-decoration: none; font: 700 .86rem ui-sans-serif, system-ui, sans-serif; cursor: pointer; }
.button-primary { border-color: var(--gold); background: var(--gold); color: var(--night); }
.button-primary:hover { color: #000; background: #f4cc80; }
.button-quiet { background: rgba(16, 24, 45, .7); }
.hero-note { max-width: 43rem; color: var(--muted); font-size: .9rem; }
.archive-cover { position: relative; justify-self: end; width: min(100%, 360px); aspect-ratio: .72; overflow: hidden; border: 1px solid #516184; border-radius: 4px 22px 22px 4px; padding: clamp(1.5rem, 4vw, 2.5rem); background: linear-gradient(145deg, rgba(123, 216, 210, .13), transparent 38%), linear-gradient(160deg, #1a2747, #0b1123 72%); box-shadow: -22px 25px 60px #0008, inset 16px 0 0 #080c18, inset 18px 0 0 #c3974a; transform: rotate(2deg); }
.archive-cover::before { content: ""; position: absolute; inset: 12% 11% auto; height: 1px; background: var(--line); box-shadow: 0 8rem var(--line), 0 15.5rem var(--line); }
.archive-cover::after { content: "57"; position: absolute; right: -1rem; bottom: -4.5rem; color: #ffffff08; font: 800 17rem/1 ui-sans-serif, system-ui, sans-serif; }
.archive-cover span, .archive-cover strong, .archive-cover small { position: relative; z-index: 1; display: block; }
.cover-index { color: var(--gold); font: 700 .72rem ui-monospace, monospace; letter-spacing: .18em; }
.archive-cover strong { margin-top: 5rem; font-size: clamp(1.75rem, 4vw, 3rem); line-height: 1.18; letter-spacing: .02em; }
.cover-line { width: 4rem; height: .2rem; margin-top: 2rem; background: var(--cyan); }
.archive-cover small { position: absolute; left: 2.5rem; bottom: 2.4rem; color: var(--muted); font: .68rem ui-monospace, monospace; letter-spacing: .16em; }
.scope-strip, .briefing { display: grid; grid-template-columns: minmax(220px, .8fr) minmax(0, 1.2fr); gap: 2rem; margin: 0 0 5rem; padding: 2rem; border-block: 1px solid var(--line); background: linear-gradient(90deg, rgba(16, 24, 45, .9), transparent); }
.scope-strip h2, .briefing h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.4rem); }
.scope-strip > p, .briefing > p { margin: 0; color: var(--muted); }
.timeline-section, .files-section, .source-note, .faq, .method-panel, .tag-explainer, .index-list, .profile-copy, .tool-notes, .prose { padding: clamp(3rem, 7vw, 6rem) 0; }
.timeline-section > header, .files-section > header { max-width: 42rem; margin-bottom: 2.5rem; }
.timeline-section h2, .files-section h2, .source-note h2, .faq h2 { margin: 0; font-size: clamp(2rem, 4.5vw, 3.6rem); }
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { position: relative; display: grid; grid-template-columns: 6rem minmax(0, 1fr); gap: 1rem; padding: 1.75rem 0; border-top: 1px solid var(--line); }
.timeline li::before { content: ""; position: absolute; left: 2.9rem; top: 0; bottom: -1px; width: 1px; background: linear-gradient(var(--gold), var(--line)); }
.timeline-no { position: relative; z-index: 1; display: grid; place-items: center; align-self: start; width: 3.3rem; aspect-ratio: 1; margin-left: 1.3rem; border-radius: 50%; border: 1px solid var(--gold); background: var(--night); color: var(--gold); font: 700 .75rem ui-monospace, monospace; }
.timeline h2 { margin: 0 0 .4rem; font-size: clamp(1.25rem, 2.5vw, 2rem); }
.timeline p { max-width: 48rem; margin: 0; color: var(--muted); }
.file-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.file-grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.file-card { position: relative; min-width: 0; min-height: 260px; padding: 1.6rem; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(155deg, rgba(21, 31, 56, .96), rgba(9, 14, 29, .96)); }
.file-card::after { content: attr(data-file); position: absolute; right: -.25rem; bottom: -2.4rem; color: #ffffff09; font: 800 8rem ui-sans-serif, system-ui, sans-serif; }
.file-card h2, .file-card p, .file-card span { position: relative; z-index: 1; }
.file-card h2 { margin: 1rem 0 .8rem; font-size: clamp(1.25rem, 2.6vw, 1.8rem); }
.file-card p:not(.file-meta) { color: var(--muted); }
.file-action { display: inline-block; margin-top: 1.1rem; color: var(--cyan); font: 700 .78rem ui-sans-serif, system-ui, sans-serif; }
.section-link { margin-top: 1.5rem; text-align: right; }
.source-note { border-top: 1px solid var(--line); }
.source-columns { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 2rem; }
.source-columns p { margin: 0; padding: 1.5rem; border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); color: var(--muted); }
.source-columns strong { display: block; margin-bottom: .6rem; color: var(--ink); }
.faq details { border-top: 1px solid var(--line); padding: 1.1rem 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { max-width: 52rem; color: var(--muted); }
.listing-hero, .article-header, .tool-hero { padding: clamp(4.5rem, 9vw, 8rem) 0 3rem; border-bottom: 1px solid var(--line); }
.listing-hero h1, .article-header h1, .tool-hero h1 { max-width: 61rem; font-size: clamp(2.4rem, 6vw, 5rem); }
.listing-hero > p:last-child, .article-deck, .tool-hero > p:last-child { max-width: 50rem; color: var(--muted); font-size: 1.1rem; }
.listing-hero.compact { padding-bottom: 2rem; }
.method-panel, .tag-explainer, .tool-notes { border-top: 1px solid var(--line); }
.method-panel ol { padding-left: 1.4rem; color: var(--muted); }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: clamp(2rem, 6vw, 5rem); padding: 3rem 0 5rem; }
.source-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; margin: 2rem 0 0; }
.source-facts div { padding: 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.source-facts dt { color: var(--gold); font: 700 .65rem ui-monospace, monospace; letter-spacing: .1em; }
.source-facts dd { margin: .4rem 0 0; color: var(--muted); }
.article-content { min-width: 0; }
.article-content section + section { margin-top: 3rem; }
.article-content h2, .prose h2, .profile-copy h2, .tool-notes h2, .tag-explainer h2 { font-size: clamp(1.55rem, 3vw, 2.35rem); }
.article-content p, .prose p, .profile-copy p, .tool-notes p, .tag-explainer p { color: #d3dbeb; }
.check-list { padding: 1.3rem 1.3rem 1.3rem 2.5rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); color: var(--muted); }
.article-aside { align-self: start; position: sticky; top: 1rem; display: grid; gap: .8rem; padding: 1.35rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.article-aside blockquote { margin: 0 0 .5rem; padding-left: 1rem; border-left: 3px solid var(--gold); color: var(--muted); }
.article-aside a { font-size: .9rem; }
.index-list ol { list-style: none; padding: 0; }
.index-list li { display: grid; grid-template-columns: minmax(180px, .45fr) minmax(0, 1fr); gap: 2rem; padding: 1.2rem 0; border-top: 1px solid var(--line); }
.index-list li p { margin: 0; color: var(--muted); }
.profile-hero { display: flex; align-items: center; gap: 2rem; padding: clamp(4.5rem, 9vw, 8rem) 0 3rem; border-bottom: 1px solid var(--line); }
.profile-hero h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
.profile-index { display: grid; place-items: center; flex: 0 0 7rem; aspect-ratio: 1; border: 1px solid var(--gold); border-radius: 50%; color: var(--gold); font: 700 1.2rem ui-monospace, monospace; }
.role { color: var(--muted); }
.profile-copy, .prose { max-width: 52rem; }
.tool-panel { margin: 3rem 0 5rem; padding: clamp(1.4rem, 4vw, 2.5rem); border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.tool-panel label { display: block; margin: 1.5rem 0 .5rem; color: var(--gold); font: 700 .75rem ui-sans-serif, system-ui, sans-serif; }
.tool-panel textarea, .tool-panel select { display: block; width: 100%; min-width: 0; margin-bottom: 1rem; padding: .9rem; border: 1px solid #53658d; border-radius: 10px; background: #080d1b; color: var(--ink); resize: vertical; }
.tool-output { min-height: 5rem; margin-top: 1rem; padding: 1rem; border: 1px dashed #53658d; border-radius: 10px; color: var(--muted); white-space: pre-line; }
.status-card { margin: 3rem 0; padding: 2rem; border: 1px solid var(--gold); border-radius: var(--radius); background: linear-gradient(145deg, rgba(231, 183, 95, .12), var(--panel)); }
.status-card dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.status-card div { padding: 1rem; border: 1px solid var(--line); }
.status-card dt { color: var(--gold); }
.status-card dd { margin: .35rem 0 0; overflow-wrap: anywhere; }
.next-files { margin: 2rem 0 6rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.next-files h2 { font-size: 1rem; color: var(--gold); font-family: ui-monospace, monospace; letter-spacing: .12em; text-transform: uppercase; }
.next-file-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.next-file-grid a { min-width: 0; padding: 1rem; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; background: rgba(16, 24, 45, .72); overflow-wrap: anywhere; }
.next-file-grid span { display: block; margin-bottom: .35rem; color: var(--muted); font-size: .72rem; }
.site-footer { display: grid; grid-template-columns: 1fr 1.5fr; gap: 2rem; padding-block: 3rem; border-top: 1px solid var(--line); color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; align-content: start; gap: .5rem 1rem; }
.site-footer a { font-size: .86rem; }
.footer-status { grid-column: 1 / -1; margin: 0; padding-top: 1rem; border-top: 1px dashed var(--line); font: .68rem ui-monospace, monospace; letter-spacing: .08em; }
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .archive-cover { justify-self: start; width: min(76vw, 340px); }
  .file-grid-three { grid-template-columns: 1fr; }
  .article-grid { grid-template-columns: 1fr; }
  .article-aside { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-aside .aside-label, .article-aside blockquote { grid-column: 1 / -1; }
  .source-columns { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .masthead, .nav-tier, main, .site-footer { width: min(calc(100% - 1.25rem), var(--max)); }
  .masthead { min-height: 64px; }
  .nav-toggle { display: inline-flex; }
  .two-tier-nav { display: none; padding-bottom: .5rem; }
  .two-tier-nav.is-open { display: block; }
  .nav-tier { align-items: stretch; flex-direction: column; gap: 0; min-height: 0; padding-block: .35rem; overflow: visible; }
  .nav-tier a, .tier-label { padding: .55rem .2rem; }
  .hero { gap: 3rem; padding-block: 4rem; }
  .hero h1 { font-size: clamp(2.7rem, 17vw, 4.2rem); }
  .archive-cover { width: min(86vw, 320px); }
  .scope-strip, .briefing { grid-template-columns: 1fr; gap: 1rem; margin-bottom: 2rem; padding: 1.2rem; }
  .timeline li { grid-template-columns: 4rem minmax(0, 1fr); }
  .timeline li::before { left: 1.9rem; }
  .timeline-no { width: 2.8rem; margin-left: .5rem; }
  .file-grid { grid-template-columns: 1fr; }
  .source-facts, .status-card dl { grid-template-columns: 1fr; }
  .index-list li { grid-template-columns: 1fr; gap: .35rem; }
  .profile-hero { align-items: flex-start; flex-direction: column; }
  .profile-index { flex-basis: auto; width: 5rem; }
  .next-file-grid { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-status { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }