:root {
  color-scheme: dark;
  --ink: #101827;
  --night: #172235;
  --paper: #f5f1e8;
  --paper-muted: #e6e1d6;
  --mist: #c7d2e2;
  --muted: #9eacc1;
  --line: #314158;
  --signal: #57e6d2;
  --coral: #ff8b71;
  --violet: #a998ff;
  --focus: #ffe077;
  --ink-on-paper: #172235;
  --display: "Noto Serif SC", "Songti SC", "STSong", serif;
  --body: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, monospace;
  --page-max: 75rem;
  --gutter: 1.25rem;
  --radius-sm: .5rem;
  --radius: .75rem;
  --radius-lg: 1.25rem;
  font-family: var(--body);
  scrollbar-color: var(--signal) var(--ink);
  scrollbar-width: thin;
}

* { box-sizing: border-box; }
html { background: var(--ink); }
body { min-width: 20rem; margin: 0; color: var(--mist); background: radial-gradient(circle at 82% -4%, rgb(87 230 210 / 13%), transparent 31rem), radial-gradient(circle at 5% 28rem, rgb(169 152 255 / 9%), transparent 28rem), var(--ink); font: 16px/1.72 var(--body); }
::-webkit-scrollbar { width: .75rem; height: .75rem; }
::-webkit-scrollbar-track { background: var(--ink); }
::-webkit-scrollbar-thumb { border: 3px solid var(--ink); border-radius: 999px; background: #496377; }
::-webkit-scrollbar-thumb:hover { background: var(--signal); }
::-webkit-scrollbar-thumb:active { background: var(--coral); }
h1, h2, h3 { line-height: 1.22; text-wrap: balance; }
h1, h2 { font-family: var(--display); }
h1 { font-size: clamp(2.4rem, 5vw, 5rem); letter-spacing: -.055em; }
h2 { font-size: clamp(1.55rem, 2.3vw, 2.4rem); letter-spacing: -.035em; }
h3 { font-size: 1.08rem; }
p { max-width: 72ch; }
a { color: var(--signal); text-decoration-color: color-mix(in srgb, currentColor 45%, transparent); text-decoration-thickness: .08em; text-underline-offset: .19em; }
a:hover { color: #b1fff5; text-decoration-thickness: .14em; }
a:active { color: var(--coral); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.page-shell { width: min(var(--page-max), calc(100% - (var(--gutter) * 2))); margin: 0 auto; padding: 3rem 0 6rem; }
.site-header { position: sticky; z-index: 5; top: 0; border-bottom: 1px solid color-mix(in srgb, var(--mist) 18%, transparent); background: rgb(16 24 39 / 88%); backdrop-filter: blur(18px); }
.site-nav { width: min(var(--page-max), calc(100% - (var(--gutter) * 2))); min-height: 4.7rem; margin: 0 auto; display: flex; align-items: center; gap: .35rem; }
.site-nav .brand { display: inline-flex; align-items: center; gap: .65rem; margin-right: auto; color: var(--paper); font: 700 1.16rem/1 var(--display); letter-spacing: -.03em; text-decoration: none; }
.brand-mark, .constellation-node { display: inline-block; flex: 0 0 auto; border: 2px solid var(--signal); border-radius: 50%; box-shadow: 0 0 0 4px rgb(87 230 210 / 11%); }
.brand-mark { width: .7rem; height: .7rem; }
.constellation-node { width: .55rem; height: .55rem; }
.nav-link { position: relative; padding: .55rem .75rem; border-radius: 999px; color: var(--mist); font-size: .92rem; text-decoration: none; }
.nav-link:hover { color: var(--ink); background: var(--signal); text-decoration: none; }
.nav-link:active { background: var(--coral); }
.page-home .nav-home, .page-topics .nav-topics, .page-books .nav-books, .page-search .nav-search { color: var(--signal); }
.site-search { display: flex; align-items: center; gap: .5rem; margin-left: .65rem; }
.site-search input { width: min(18vw, 13rem); }
.site-footer { width: min(var(--page-max), calc(100% - (var(--gutter) * 2))); margin: 0 auto; padding: 2rem 0 2.75rem; border-top: 1px solid color-mix(in srgb, var(--mist) 18%, transparent); color: var(--muted); font-size: .92rem; }
.site-footer p { margin: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: clip; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.constellation-rail { position: relative; isolation: isolate; }
.constellation-rail::before { position: absolute; z-index: -1; inset: 1.25rem auto auto -1.25rem; width: clamp(10rem, 30vw, 24rem); height: 6.5rem; border-top: 1px solid rgb(87 230 210 / 33%); border-right: 1px solid rgb(169 152 255 / 20%); border-radius: 0 4rem 0 0; content: ""; transform: skewY(-9deg); }
.section-kicker, .route-kicker { display: flex; align-items: center; gap: .55rem; margin: 0 0 .7rem; color: var(--coral); font-size: .76rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.section-kicker::before, .route-kicker::before { width: 1.6rem; height: 1px; background: currentColor; content: ""; }
.home-hero { min-height: 28rem; display: grid; align-content: center; max-width: 61rem; padding: 4.5rem 0 5.5rem; }
.home-hero h1 { max-width: 14ch; margin: 0; color: var(--paper); }
.hero-summary { margin: 1.5rem 0 2rem; color: var(--mist); font-size: clamp(1rem, 1.5vw, 1.15rem); }
.search-command { display: grid; grid-template-columns: minmax(0, 29rem) auto; gap: .7rem; max-width: 38rem; }
.search-command label { grid-column: 1 / -1; color: var(--mist); font-size: .9rem; }
.section-block + .section-block { margin-top: 4.75rem; }
.section-header { display: flex; align-items: end; justify-content: space-between; gap: 1.25rem; margin-bottom: 1.35rem; }
.section-header h2 { margin: 0; color: var(--paper); }
.section-header p { margin: 0; color: var(--muted); font-size: .92rem; }
.discovery-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.discovery-grid--featured { grid-template-columns: 1.2fr .8fr .8fr; }
.content-card { position: relative; min-width: 0; min-height: 11.5rem; display: flex; flex-direction: column; border: 1px solid color-mix(in srgb, var(--mist) 18%, transparent); border-radius: var(--radius-lg); background: linear-gradient(145deg, rgb(245 241 232 / 98%), rgb(224 222 216 / 94%)); color: var(--ink-on-paper); padding: 1.35rem; box-shadow: 0 1.25rem 3rem rgb(0 0 0 / 16%); overflow: clip; transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease; }
.content-card::after { position: absolute; top: 1.1rem; right: 1.1rem; width: .5rem; height: .5rem; border: 1px solid var(--violet); border-radius: 50%; box-shadow: -1.3rem 1.1rem 0 -1px var(--coral), -2.6rem .35rem 0 -1px var(--signal); content: ""; }
.content-card:hover { border-color: color-mix(in srgb, var(--signal) 68%, var(--mist)); box-shadow: 0 1.6rem 3.3rem rgb(0 0 0 / 24%); transform: translateY(-.25rem); }
.content-card h3 { max-width: 19ch; margin: 1.5rem 0 .75rem; font-size: 1.16rem; }
.content-card h3 a { color: var(--ink-on-paper); text-decoration: none; }
.content-card h3 a:hover { color: #075f62; text-decoration: underline; }
.content-card p { margin: 0 0 .55rem; color: #4b5c6a; font-size: .91rem; }
.content-card p:last-child { margin-top: auto; margin-bottom: 0; }
.card-kind { color: #2b6e70 !important; font-size: .72rem !important; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.card-meta { font-family: var(--mono); font-size: .78rem !important; }
.book-group + .book-group { margin-top: 3.5rem; }
.book-group h2 { margin: 0 0 1rem; color: var(--paper); }
.book-category-badge, .type-badge { display: inline-flex; align-items: center; border-radius: 999px; color: #4d367e; background: #ddd6ff; padding: .2rem .62rem; font-size: .74rem; font-weight: 700; }
.book-catalog-filter { margin: 1.5rem 0 3rem; }
.book-catalog-filter h1 { margin: 0 0 1.25rem; color: var(--paper); font-size: clamp(1.75rem, 3vw, 2.8rem); }
.book-category-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: .65rem; }
.book-category-filter { display: flex; align-items: center; justify-content: space-between; gap: .75rem; min-height: 3.25rem; border: 1px solid color-mix(in srgb, var(--mist) 28%, transparent); border-radius: var(--radius-sm); background: rgb(23 34 53 / 72%); padding: .65rem .8rem; color: var(--mist); font-size: .9rem; font-weight: 700; text-decoration: none; }
.book-category-filter span:last-child { color: var(--coral); font: .76rem/1 var(--mono); white-space: nowrap; }
.book-category-filter:hover, .book-category-filter.is-active { border-color: var(--signal); color: var(--ink); background: var(--signal); }
.book-category-filter.is-active span:last-child { color: #075f62; }
.book-reading-type { display: inline-flex; align-items: center; width: fit-content; border-left: 3px solid var(--line); padding-left: .55rem; font-weight: 800; }
.book-reading-type--classic { border-color: var(--signal); color: #075f62 !important; }
.book-reading-type--practice { border-color: var(--coral); color: #a23c28 !important; }
.book-reading-type--map { border-color: var(--violet); color: #58448d !important; }
.book-reading-type--reference { border-color: var(--focus); color: #826515 !important; }
.book-reading-type--unspecified { border-color: var(--line); }

.page-intro { max-width: 47rem; margin: 1.5rem 0 2rem; }
.page-intro h1 { margin: 0; color: var(--paper); }
.page-intro p:last-child { margin: 1rem 0 0; color: var(--mist); }
.filter-panel { display: flex; flex-wrap: wrap; align-items: end; gap: 1rem; margin: 0 0 2rem; border: 1px solid color-mix(in srgb, var(--mist) 20%, transparent); border-radius: var(--radius); background: rgb(23 34 53 / 78%); padding: 1.1rem; }
.filter-panel label { min-width: 10rem; display: grid; gap: .4rem; color: var(--mist); font-size: .83rem; }
.filter-panel label:has(input[type="checkbox"]) { min-width: auto; display: flex; align-items: center; gap: .5rem; padding-bottom: .6rem; }
input, select, button { min-height: 2.75rem; border: 1px solid color-mix(in srgb, var(--mist) 35%, transparent); border-radius: var(--radius-sm); padding: .6rem .75rem; font: inherit; }
input, select { color: var(--ink-on-paper); background: var(--paper); }
input::placeholder { color: #687486; opacity: 1; }
input:hover, select:hover { border-color: var(--signal); }
input:focus-visible, select:focus-visible { border-color: var(--signal); }
input[type="checkbox"] { min-height: auto; accent-color: var(--signal); }
button { border-color: var(--signal); color: var(--ink); background: var(--signal); font-weight: 800; cursor: pointer; }
button:hover { border-color: #b1fff5; background: #b1fff5; }
button:active { border-color: var(--coral); background: var(--coral); transform: translateY(1px); }
button:disabled { border-color: #64748b; color: #94a3b8; background: #334155; cursor: not-allowed; }
nav[aria-label="面包屑"] { margin-bottom: 1.2rem; color: var(--muted); font-size: .9rem; }
.notice, .state-panel { min-height: 4.25rem; margin: 0 0 1rem; border-left: 3px solid var(--coral); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; background: rgb(255 139 113 / 13%); padding: .95rem 1.1rem; color: var(--paper); }
.collection-stats, .stats, .metadata { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin-top: 4.75rem; border: 1px solid color-mix(in srgb, var(--mist) 18%, transparent); background: color-mix(in srgb, var(--mist) 18%, transparent); }
.collection-stats div, .stats div, .metadata div { min-width: 0; background: var(--night); padding: 1.25rem; }
.stats dt { color: var(--muted); font-size: .82rem; }
.stats dd { margin: .4rem 0 0; color: var(--paper); font: 700 clamp(2rem, 3vw, 3rem)/1 var(--display); }

.document-header { max-width: 56rem; margin-bottom: 2.75rem; padding: 1rem 0 1.25rem; }
.document-header h1 { margin: 0; color: var(--paper); }
.document-header > p:last-child { margin: 1rem 0 0; color: var(--mist); }
.document-meta { color: var(--coral) !important; font: .82rem/1.6 var(--mono); }
.detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(17rem, .36fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: start; }
.detail-document { min-width: 0; }
.reading-surface, .checklist-summary { border: 1px solid color-mix(in srgb, var(--mist) 18%, transparent); border-radius: var(--radius-lg); background: var(--paper); color: var(--ink-on-paper); padding: clamp(1.35rem, 3vw, 2.5rem); box-shadow: 0 1.5rem 3rem rgb(0 0 0 / 15%); }
.reading-surface + .reading-surface { margin-top: 1.25rem; }
.reading-surface h2, .checklist-summary h2 { margin-top: 0; }
.collapsible-surface summary { cursor: pointer; list-style: none; }
.collapsible-surface summary::-webkit-details-marker { display: none; }
.collapsible-surface summary h2 { display: flex; align-items: center; gap: .5rem; }
.collapsible-surface summary h2::after { content: "展开 ▾"; color: var(--coral); font-size: .72rem; font-weight: 700; letter-spacing: .04em; }
.collapsible-surface[open] summary h2::after { content: "收起 ▴"; }
.collapsible-surface[open] summary { margin-bottom: 1rem; }
.card-content-surface { border-color: var(--coral); }
.card-content-surface h2 { font-family: var(--display); }
.card-content-surface .preserve-lines { font-size: 1.08rem; line-height: 1.75; }
.card-sequence-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.card-sequence-nav > :last-child { text-align: right; }
.card-sequence-nav a { min-width: 0; display: grid; gap: .35rem; border: 1px solid color-mix(in srgb, var(--signal) 42%, transparent); border-radius: var(--radius-sm); background: rgb(23 34 53 / 72%); padding: .9rem 1rem; color: var(--signal); font-weight: 800; text-decoration: none; }
.card-sequence-nav a span { overflow-wrap: anywhere; color: var(--mist); font-size: .86rem; font-weight: 400; }
.card-sequence-nav a:hover { border-color: var(--signal); background: var(--night); color: #b1fff5; }
.card-sequence-nav a:active { border-color: var(--coral); color: var(--coral); }
.exploration-index { position: sticky; top: 6.25rem; border: 1px solid color-mix(in srgb, var(--signal) 42%, transparent); border-radius: var(--radius); background: var(--night); padding: 1.35rem; }
.exploration-index h2 { margin-top: 0; color: var(--paper); font-family: var(--display); }
.exploration-index h3 { margin-top: 1.65rem; color: var(--coral); font-size: .8rem; letter-spacing: .1em; }
.exploration-index ul { padding-left: 1.2rem; }
.exploration-index li + li { margin-top: .65rem; }
.checklist-summary { margin: 1.5rem 0; }
.checklist-score { margin: 0; color: var(--coral); font: 700 2.5rem/1 var(--display); }
.checklist-counts { display: flex; flex-wrap: wrap; gap: .5rem 1.1rem; margin-top: 1rem; color: #556373; }
.preserve-lines { white-space: pre-wrap; overflow-wrap: anywhere; }
.markdown-body { overflow-wrap: anywhere; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body pre { max-width: 100%; overflow-x: auto; border-radius: var(--radius-sm); background: #172235; padding: 1rem 1.15rem; color: #d7fff8; }
.markdown-body code { border-radius: .25rem; background: #e1ded5; padding: .1em .3em; font-family: var(--mono); }
.markdown-body pre code { background: none; padding: 0; }
.markdown-body blockquote { margin-left: 0; border-left: 3px solid var(--coral); color: #566373; padding-left: 1rem; }
.markdown-body table { display: block; width: max-content; max-width: 100%; overflow-x: auto; border-collapse: collapse; scrollbar-gutter: stable; }
.markdown-body th, .markdown-body td { border: 1px solid #c9c4b8; padding: .55rem .75rem; text-align: left; }
.markdown-body th { background: #e1ded5; }
.recommendation-reason { color: var(--muted); font-size: .9rem; }
.topic-detail > section { margin-top: 3.5rem; }
.topic-detail ol, .topic-detail ul { padding-left: 1.4rem; }
.topic-detail li { margin-bottom: .85rem; }
.search-results { display: grid; gap: .8rem; padding: 0; list-style: none; }
.search-results li { min-height: 8rem; border: 1px solid color-mix(in srgb, var(--mist) 20%, transparent); border-radius: var(--radius); background: var(--night); padding: 1.15rem 1.25rem; }
.search-results li > span { display: inline-flex; margin-right: .55rem; border-radius: 999px; color: #4d367e; background: #ddd6ff; padding: .15rem .55rem; font-size: .72rem; font-weight: 800; }
.search-results li > a { color: var(--paper); font-size: 1.08rem; font-weight: 750; }
.search-results p { margin: .4rem 0 0; color: var(--mist); }
.error-page { width: min(43rem, calc(100% - (var(--gutter) * 2))); min-height: 55vh; margin: 0 auto; display: grid; align-content: center; }
.error-page h1 { color: var(--paper); }

@media (max-width: 760px) {
  .page-shell { padding-top: 2rem; }
  .site-nav { min-height: auto; flex-wrap: wrap; padding: .8rem 0; gap: .2rem; }
  .site-nav .brand { width: 100%; margin-bottom: .35rem; }
  .site-search { width: 100%; margin: .45rem 0 0; }
  .site-search input { width: 100%; }
  .home-hero { min-height: auto; padding: 3.25rem 0 3.75rem; }
  .home-hero h1 { max-width: 11ch; }
  .search-command { grid-template-columns: 1fr; }
  .discovery-grid, .discovery-grid--featured, .detail-layout, .collection-stats, .stats, .metadata { grid-template-columns: 1fr; }
  .section-header { display: block; }
  .section-header p { margin-top: .45rem; }
  .filter-panel, .filter-panel label, .filter-panel input, .filter-panel select, .filter-panel button { width: 100%; }
	.book-category-nav { grid-template-columns: 1fr; }
  .filter-panel label:has(input[type="checkbox"]) { width: auto; }
	.card-sequence-nav { grid-template-columns: 1fr; }
	.card-sequence-nav > :last-child { text-align: left; }
  .exploration-index { position: static; }
  .constellation-rail::before { left: -.4rem; opacity: .75; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; } }
@media (forced-colors: active) { :root { scrollbar-color: auto; } .content-card, .reading-surface, .exploration-index, .filter-panel { forced-color-adjust: auto; } }

.card-diagram { overflow-x: auto; padding: 1rem 0; }
.card-diagram svg { display: block; margin-inline: auto; min-width: 36rem; }