/* finesse · register=brand · layout=editorial-library+indexed-rows · palette=cobalt-frost · SOUL=6 SPECTACLE=2 DENSITY=7 */
:root {
  --library-canvas: oklch(98.2% 0.008 264);
  --library-grid: oklch(83% 0.03 264 / 28%);
  --library-surface: oklch(99.6% 0.003 264);
  --library-ink: oklch(16% 0.026 264);
  --library-soft: oklch(31% 0.026 264);
  --library-muted: oklch(48% 0.024 264);
  --library-line: oklch(87% 0.02 264);
  --library-line-strong: oklch(72% 0.03 264);
  --library-accent: oklch(49% 0.28 264);
  --library-accent-strong: oklch(40% 0.25 264);
  --library-accent-soft: oklch(93% 0.052 264);
  --library-on-accent: oklch(99% 0.005 264);
  --library-shadow: oklch(22% 0.05 264 / 12%);
  --library-focus: oklch(66% 0.21 250);
  --library-font: "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  --library-radius-sm: 0.7rem;
  --library-radius-md: 1.1rem;
  --library-radius-lg: 1.8rem;
  --library-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { min-width: 20rem; color-scheme: light; scroll-behavior: smooth; background: var(--library-canvas); }
body { min-height: 100vh; margin: 0; color: var(--library-ink); background-color: var(--library-canvas); background-image: linear-gradient(var(--library-grid) 1px, transparent 1px), linear-gradient(90deg, var(--library-grid) 1px, transparent 1px); background-size: 4rem 4rem; font-family: var(--library-font); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { max-width: 100%; }
:focus-visible { outline: 3px solid var(--library-focus); outline-offset: 3px; }

.skip-link { position: fixed; z-index: 30; inset: 0.75rem auto auto 0.75rem; padding: 0.75rem 1rem; border-radius: var(--library-radius-sm); color: var(--library-on-accent); background: var(--library-accent-strong); transform: translateY(-160%); transition: transform 180ms var(--library-ease); }
.skip-link:focus { transform: translateY(0); }
.library-shell { width: min(92rem, calc(100% - clamp(2rem, 7vw, 7rem))); margin-inline: auto; }

.library-topbar { position: sticky; z-index: 20; inset-block-start: 0; border-block-end: 1px solid var(--library-line); background: color-mix(in oklch, var(--library-canvas) 92%, transparent); backdrop-filter: blur(18px); }
.library-topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; min-height: 4.5rem; }
.library-brand { display: inline-flex; align-items: center; gap: 0.75rem; min-height: 2.75rem; text-decoration: none; }
.library-brand__mark { display: grid; width: 2.65rem; aspect-ratio: 1; place-items: center; overflow: hidden; border-radius: 0.85rem; box-shadow: 0 0.75rem 1.5rem var(--library-shadow); }
.library-brand__mark img { display: block; width: 100%; height: 100%; }
.library-brand > span:last-child { display: grid; gap: 0.05rem; }
.library-brand strong { font-size: 1rem; font-weight: 950; letter-spacing: -0.045em; }
.library-brand strong span { color: var(--library-accent); }
.library-brand small { color: var(--library-muted); font-size: 0.67rem; font-weight: 700; }
.library-nav { display: flex; align-items: center; gap: clamp(0.85rem, 2.6vw, 2.2rem); }
.library-nav a { display: inline-flex; align-items: center; min-height: 2.75rem; color: var(--library-soft); font-size: 0.76rem; font-weight: 800; text-decoration: none; white-space: nowrap; }
.library-nav a:last-child { padding-inline: 1rem; border: 1px solid var(--library-line-strong); border-radius: 999px; }
.library-nav a:hover { color: var(--library-accent); }

.library-hero { padding-block: clamp(2.8rem, 7vw, 7rem) clamp(3rem, 7vw, 6rem); }
.library-breadcrumb { display: flex; align-items: center; gap: 0.55rem; margin-block-end: clamp(2rem, 5vw, 4.5rem); color: var(--library-muted); font-size: 0.72rem; }
.library-breadcrumb a { min-height: 2.75rem; display: inline-flex; align-items: center; text-decoration: none; }
.library-breadcrumb a:hover { color: var(--library-accent); }
.library-hero__grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(19rem, 0.65fr); align-items: end; gap: clamp(2rem, 7vw, 8rem); }
.library-hero__grid > div:first-child > p { margin: 0 0 1rem; color: var(--library-accent); font-size: 0.76rem; font-weight: 850; }
.library-hero h1 { max-width: 58rem; margin: 0; font-size: clamp(3rem, 7.7vw, 7.8rem); font-weight: 950; letter-spacing: -0.085em; line-height: 0.96; text-wrap: balance; }
.library-hero__grid > div:last-child > p { margin: 0; color: var(--library-muted); font-size: clamp(0.9rem, 1.2vw, 1.05rem); line-height: 1.9; }
.library-hero__grid > div:last-child > a { display: inline-flex; min-height: 2.75rem; margin-block-start: 1.5rem; align-items: center; color: var(--library-accent); font-size: 0.78rem; font-weight: 850; text-underline-offset: 0.3rem; }

.category-jump { display: flex; gap: 0.55rem; padding-block: 0 2rem; overflow-x: auto; scrollbar-width: none; }
.category-jump::-webkit-scrollbar { display: none; }
.category-jump a { display: inline-grid; min-height: 2.75rem; padding-inline: 1rem; place-items: center; border: 1px solid var(--library-line); border-radius: 999px; background: var(--library-surface); font-size: 0.75rem; font-weight: 800; text-decoration: none; white-space: nowrap; }
.category-jump a:hover { color: var(--library-on-accent); border-color: var(--library-accent); background: var(--library-accent); }

.brand-groups { padding-block-end: clamp(4rem, 9vw, 9rem); }
.brand-group { padding-block: clamp(3rem, 6vw, 6rem); border-block-start: 1px solid var(--library-line-strong); }
.brand-group > header, .category-directory > header { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 2rem; margin-block-end: 2rem; }
.brand-group > header > div { max-width: 54rem; }
.brand-group h2, .category-directory h2 { margin: 0; font-size: clamp(2rem, 4vw, 4rem); font-weight: 930; letter-spacing: -0.06em; }
.brand-group header p, .category-directory header p { margin: 0.8rem 0 0; color: var(--library-muted); font-size: 0.84rem; line-height: 1.75; }
.brand-group header a, .category-directory header > a { display: inline-flex; min-height: 2.75rem; align-items: center; color: var(--library-accent); font-size: 0.75rem; font-weight: 850; text-underline-offset: 0.3rem; }

.seo-brand-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-block-start: 1px solid var(--library-line); border-inline-start: 1px solid var(--library-line); }
.seo-brand { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; min-width: 0; min-height: 15rem; padding: 1.2rem; overflow: hidden; border-inline-end: 1px solid var(--library-line); border-block-end: 1px solid var(--library-line); background: var(--library-surface); text-decoration: none; transition: color 280ms ease, background 280ms ease, transform 380ms var(--library-ease); }
.seo-brand:hover, .seo-brand:focus-visible { z-index: 2; color: var(--library-on-accent); background: var(--library-accent-strong); transform: translateY(-0.25rem); }
.seo-brand__logo { grid-column: 1 / -1; display: grid; min-height: 7.2rem; place-items: center; overflow: hidden; border: 1px solid var(--library-line); border-radius: var(--library-radius-md); background: var(--library-surface); }
.seo-brand__logo--treatment-dark-panel { background: var(--library-ink); }
.seo-brand__logo img { grid-area: 1 / 1; place-self: center; display: block; width: auto; height: auto; max-width: calc(100% - 1.5rem); max-height: 5.6rem; object-fit: contain; transform: translate(var(--logo-x, 0%), var(--logo-y, 0%)) scale(var(--logo-scale, 1)); transform-origin: center; }
.seo-brand__logo img[src$=".svg"] { width: calc(100% - 1.5rem); }
.seo-brand__logo__fallback { grid-area: 1 / 1; color: var(--library-ink); font-size: 1rem; font-weight: 900; }
.seo-brand__logo.has-image .seo-brand__logo__fallback,
.seo-brand__logo.is-loading .seo-brand__logo__fallback { display: none; }
.seo-brand__copy { display: grid; min-width: 0; align-content: end; }
.seo-brand__copy strong { font-size: 1rem; font-weight: 920; letter-spacing: -0.04em; }
.seo-brand__copy code { margin-block-start: 0.35rem; overflow-wrap: anywhere; color: var(--library-muted); font-size: 0.66rem; }
.seo-brand__copy small { margin-block-start: 0.55rem; color: var(--library-accent); font-size: 0.63rem; font-weight: 800; }
.seo-brand:hover .seo-brand__copy code, .seo-brand:hover .seo-brand__copy small, .seo-brand:focus-visible .seo-brand__copy code, .seo-brand:focus-visible .seo-brand__copy small { color: color-mix(in oklch, var(--library-on-accent) 76%, transparent); }
.seo-brand__arrow { align-self: end; font-size: 1.1rem; }

.category-map { margin-block: 0 clamp(5rem, 10vw, 10rem); border-block-start: 1px solid var(--library-line-strong); }
.category-map__item { display: grid; grid-template-columns: 3rem minmax(0, 1fr) 10rem 2rem; align-items: center; gap: clamp(1rem, 3vw, 3rem); min-height: 11rem; padding-block: 1.5rem; border-block-end: 1px solid var(--library-line); text-decoration: none; transition: color 240ms ease, padding 380ms var(--library-ease); }
.category-map__item:hover { padding-inline: 1rem; color: var(--library-accent); }
.category-map__item > span { color: var(--library-accent); font-size: 0.7rem; font-weight: 900; }
.category-map__item h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 3.8rem); letter-spacing: -0.065em; }
.category-map__item p { max-width: 50rem; margin: 0.7rem 0 0; color: var(--library-muted); font-size: 0.82rem; line-height: 1.7; }
.category-map__item > strong { font-size: clamp(2rem, 4vw, 3.6rem); font-variant-numeric: tabular-nums; letter-spacing: -0.07em; text-align: end; }
.category-map__item > strong small { display: block; margin-block-start: 0.35rem; color: var(--library-muted); font-size: 0.65rem; font-weight: 700; letter-spacing: 0; }
.category-map__item i { font-size: 1.2rem; font-style: normal; }

.category-brief { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(19rem, 0.75fr); gap: 1px; margin-block-end: clamp(4rem, 8vw, 8rem); overflow: hidden; border: 1px solid var(--library-line); border-radius: var(--library-radius-lg); background: var(--library-line); box-shadow: 0 1.7rem 5rem var(--library-shadow); }
.category-brief > div, .category-brief aside { padding: clamp(1.6rem, 4vw, 3.5rem); background: var(--library-surface); }
.category-brief aside { color: var(--library-on-accent); background: var(--library-accent-strong); }
.category-brief h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 3rem); letter-spacing: -0.055em; }
.category-brief p { margin: 1rem 0 0; color: var(--library-muted); line-height: 1.85; }
.category-brief aside p { color: color-mix(in oklch, var(--library-on-accent) 76%, transparent); font-size: 0.86rem; }
.category-brief aside strong { font-size: 0.76rem; }
.category-directory { padding-block-end: clamp(5rem, 10vw, 10rem); }
.category-directory header p strong { color: var(--library-ink); }

.method-flow, .method-sources, .method-boundary, .privacy-copy { margin-block-end: clamp(5rem, 10vw, 10rem); }
.method-flow > header { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 2rem; padding-block-end: 1.5rem; border-block-end: 1px solid var(--library-line-strong); }
.method-flow h2, .method-sources h2, .method-boundary h2, .privacy-copy h2 { margin: 0; font-size: clamp(1.8rem, 3.5vw, 3.4rem); letter-spacing: -0.06em; }
.method-flow > header p { justify-self: end; margin: 0; color: var(--library-muted); }
.method-flow ol { margin: 0; padding: 0; list-style: none; }
.method-flow li { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: clamp(1rem, 4vw, 4rem); padding-block: clamp(2rem, 4vw, 3.5rem); border-block-end: 1px solid var(--library-line); }
.method-flow li > span { color: var(--library-accent); font-size: 0.75rem; font-weight: 900; }
.method-flow h3 { margin: 0; font-size: clamp(1.3rem, 2.5vw, 2.2rem); letter-spacing: -0.04em; }
.method-flow li p { max-width: 60rem; margin: 0.8rem 0 0; color: var(--library-muted); font-size: 0.9rem; line-height: 1.85; }
.method-sources { display: grid; grid-template-columns: minmax(18rem, 0.7fr) minmax(0, 1.3fr); gap: clamp(2rem, 7vw, 7rem); }
.method-sources > div > p { color: var(--library-muted); line-height: 1.8; }
.method-sources dl { margin: 0; border-block-start: 1px solid var(--library-line-strong); }
.method-sources dl > div { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 1.5rem; padding-block: 1.5rem; border-block-end: 1px solid var(--library-line); }
.method-sources dt { font-weight: 900; }
.method-sources dd { margin: 0; color: var(--library-muted); line-height: 1.75; }
.method-boundary { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; overflow: hidden; border-radius: var(--library-radius-lg); background: var(--library-line); box-shadow: 0 1.7rem 5rem var(--library-shadow); }
.method-boundary > div { padding: clamp(1.7rem, 4vw, 3.5rem); background: var(--library-surface); }
.method-boundary > div:last-child { color: var(--library-on-accent); background: var(--library-accent-strong); }
.method-boundary p { margin: 1rem 0 0; color: var(--library-muted); line-height: 1.85; }
.method-boundary > div:last-child p { color: color-mix(in oklch, var(--library-on-accent) 78%, transparent); }
.privacy-copy { max-width: 76rem; }
.privacy-copy section { display: grid; grid-template-columns: minmax(14rem, 0.6fr) minmax(0, 1.4fr); gap: clamp(2rem, 6vw, 7rem); padding-block: clamp(2rem, 5vw, 4rem); border-block-start: 1px solid var(--library-line); }
.privacy-copy section:last-child { border-block-end: 1px solid var(--library-line); }
.privacy-copy p { margin: 0; color: var(--library-muted); line-height: 1.95; }

.not-found { min-height: calc(100vh - 13rem); display: grid; place-items: center; padding: 2rem; text-align: center; }
.not-found > div { max-width: 45rem; }
.not-found span { color: var(--library-accent); font-size: clamp(5rem, 18vw, 12rem); font-weight: 950; letter-spacing: -0.09em; line-height: 0.8; }
.not-found h1 { margin: 2rem 0 0; font-size: clamp(2rem, 6vw, 4.5rem); letter-spacing: -0.07em; }
.not-found p { margin: 1rem auto 0; color: var(--library-muted); line-height: 1.8; }
.not-found a { display: inline-grid; min-height: 3rem; margin-block-start: 1.6rem; padding-inline: 1.3rem; place-items: center; border-radius: 999px; color: var(--library-on-accent); background: var(--library-accent-strong); font-weight: 850; text-decoration: none; }

.library-footer { color: var(--library-on-accent); background: var(--library-ink); }
.library-footer__inner { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 2rem; min-height: 8rem; padding-block: 1.5rem; }
.library-footer__inner > div p, .library-footer__inner > p { margin: 0.35rem 0 0; color: color-mix(in oklch, var(--library-on-accent) 67%, transparent); font-size: 0.72rem; }
.library-footer nav { display: flex; gap: 1.25rem; }
.library-footer nav a { display: inline-flex; min-height: 2.75rem; align-items: center; color: color-mix(in oklch, var(--library-on-accent) 74%, transparent); font-size: 0.72rem; font-weight: 750; text-decoration: none; }
.library-footer nav a:hover { color: var(--library-on-accent); }
.library-footer__inner > p { text-align: end; }
.library-footer__inner > p strong { color: var(--library-on-accent); }

@media (max-width: 68rem) {
  .library-hero__grid { grid-template-columns: minmax(0, 1fr); gap: 2rem; }
  .library-hero__grid > div:last-child { max-width: 42rem; }
  .seo-brand-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .category-map__item { grid-template-columns: 2.5rem minmax(0, 1fr) 7rem 1rem; }
}

@media (max-width: 50rem) {
  .library-topbar__inner { min-height: 4rem; }
  .library-nav a:not(:last-child) { display: none; }
  .library-nav a:last-child { padding-inline: 0.8rem; }
  .library-hero { padding-block-start: 2rem; }
  .library-breadcrumb { margin-block-end: 2rem; }
  .library-hero h1 { font-size: clamp(2.7rem, 13vw, 5.5rem); }
  .brand-group > header, .category-directory > header { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; }
  .seo-brand-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-brand { min-height: 13rem; }
  .category-map__item { grid-template-columns: 2rem minmax(0, 1fr) 1rem; gap: 1rem; min-height: 9rem; }
  .category-map__item > strong { display: none; }
  .category-brief, .method-sources, .method-boundary { grid-template-columns: minmax(0, 1fr); }
  .method-flow > header { grid-template-columns: minmax(0, 1fr); }
  .method-flow > header p { justify-self: start; }
  .privacy-copy section { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  .library-footer__inner { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; padding-block: 2rem; }
  .library-footer__inner > p { text-align: start; }
}

@media (max-width: 25rem) {
  .library-shell { width: calc(100% - 1.25rem); }
  .library-brand small { display: none; }
  .library-nav a:last-child { font-size: 0.7rem; }
  .seo-brand-grid { grid-template-columns: minmax(0, 1fr); }
  .seo-brand { min-height: 12rem; }
  .method-flow li { grid-template-columns: 2rem minmax(0, 1fr); }
  .library-footer nav { align-items: flex-start; flex-direction: column; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

@supports not (backdrop-filter: blur(1rem)) {
  .library-topbar { background: var(--library-canvas); }
}