:root {
  --publication-ink: #24272a;
  --publication-muted: #64616e;
  --publication-accent: #5441aa;
  --publication-rule: #e5e3e9;
}

* { box-sizing: border-box; }

html { scroll-padding-top: 24px; }

body {
  margin: 0;
  color: var(--publication-ink);
  background: #f7f6f2;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

::selection { color: #211342; background: #e0d7ff; }

:focus-visible { outline: 3px solid #8063df; outline-offset: 5px; }

a { color: var(--publication-accent); text-underline-offset: 4px; }

.publication-shell { width: min(100% - 48px, 1200px); margin-inline: auto; }

.publication-header { color: #fff; background: #0e0b1d; }

.publication-header > .publication-shell {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.publication-brand {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
}

.publication-brand img { width: 44px; height: 44px; border-radius: 12px; }
.publication-brand strong { display: block; font-size: 17px; letter-spacing: .08em; }
.publication-brand small { display: block; margin-top: 4px; color: #c2b9d8; font-size: 9px; letter-spacing: .12em; }

.publication-nav { display: flex; align-items: center; gap: 24px; }
.publication-nav a { display: inline-flex; min-height: 44px; align-items: center; color: #e3ddf5; font-size: 14px; text-decoration: none; }
.publication-nav a:hover, .publication-nav a[aria-current="page"] { color: #fff; text-decoration: underline; }

.publication-skip {
  position: absolute;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 12px 16px;
  color: #fff;
  background: #5441aa;
  transform: translateY(-200%);
}
.publication-skip:focus { transform: translateY(0); }

.article-wayfinding {
  width: min(100% - 48px, 1000px);
  margin: 32px auto 0;
  color: var(--publication-muted);
  font-size: 14px;
  line-height: 1.8;
}
.article-wayfinding nav { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.article-wayfinding p { margin: 10px 0 0; font-size: 13px; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 10px; font-size: 13px; }

.publication-footer { margin-top: 72px; padding: 30px 0; border-top: 1px solid var(--publication-rule); }
.publication-footer > .publication-shell { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; }
.publication-footer p, .publication-footer span, .publication-footer a { margin: 0; color: var(--publication-muted); font-size: 12px; line-height: 1.8; }
.publication-footer nav { display: flex; flex-wrap: wrap; gap: 24px; }

.article-library { min-height: calc(100svh - 285px); padding-top: 64px; }
.library-intro { max-width: 740px; margin-bottom: 48px; }
.library-intro h1 { margin: 0 0 18px; font-size: clamp(34px, 5vw, 48px); line-height: 1.25; letter-spacing: -.025em; }
.library-intro p { margin: 0; color: var(--publication-muted); font-size: 17px; line-height: 1.8; }

.article-entry {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  align-items: center;
  gap: 48px;
  padding: 32px 0;
  border-top: 1px solid var(--publication-rule);
  border-bottom: 1px solid var(--publication-rule);
}
.article-entry-media { display: block; }
.article-entry-media img { display: block; width: 100%; height: auto; border-radius: 8px; }
.article-entry time { display: block; margin-bottom: 16px; color: var(--publication-muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.article-entry h2 { margin: 0 0 18px; font-size: clamp(23px, 2.8vw, 30px); line-height: 1.55; letter-spacing: -.02em; text-wrap: pretty; }
.article-entry h2 a { color: var(--publication-ink); text-decoration: none; }
.article-entry h2 a:hover { color: var(--publication-accent); text-decoration: underline; }
.article-entry p { margin: 0 0 20px; color: var(--publication-muted); font-size: 16px; line-height: 1.85; }
.article-entry-link { display: inline-flex; min-height: 44px; align-items: center; gap: 12px; font-size: 15px; font-weight: 600; text-decoration: none; }
.article-entry-link:hover { text-decoration: underline; }
.article-entry-link svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; }

.help-main { padding-top: 32px; }
.help-breadcrumb { display: flex; flex-wrap: wrap; gap: 8px 12px; color: var(--publication-muted); font-size: 14px; line-height: 1.8; }
.help-intro { max-width: 900px; margin: 40px 0 48px; }
.help-intro h1 { text-wrap: balance; margin: 0 0 24px; font-size: clamp(30px, 4vw, 44px); line-height: 1.4; }
.help-intro p { margin: 16px 0; font-size: 17px; line-height: 1.85; color: var(--publication-muted); }
.help-intro .help-benefits { color: #5441aa; }
.help-intro .help-scope, .help-intro .help-updated { font-size: 14px; }
.help-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); align-items: start; gap: 64px; }
.help-topics { position: sticky; top: 24px; }
.help-topics nav { display: flex; flex-direction: column; gap: 8px; }
.help-topics a { display: block; padding: 10px 0; font-size: 15px; line-height: 1.6; }
.help-topic { scroll-margin-top: 24px; }
.help-topic + .help-topic { margin-top: 56px; }
.help-topic h2 { margin: 0 0 24px; padding-bottom: 20px; border-bottom: 1px solid var(--publication-rule); font-size: 28px; line-height: 1.5; }
.help-question { margin-top: 32px; scroll-margin-top: 24px; }
.help-question h3 { margin: 0 0 14px; font-size: 20px; line-height: 1.6; }
.help-question p { margin: 0; color: #46414f; font-size: 16px; line-height: 1.95; overflow-wrap: anywhere; }
.help-question .help-sources { margin-top: 12px; color: var(--publication-muted); font-size: 13px; }
.help-next { margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--publication-rule); }
.help-next h2 { font-size: 26px; }
.help-next p { max-width: 800px; color: var(--publication-muted); font-size: 16px; line-height: 1.85; }
.library-help-link { display: inline-flex; min-height: 44px; align-items: center; margin-top: 18px; font-size: 15px; }


@media (max-width: 760px) {
  .article-library { padding-top: 40px; }
  .library-intro { margin-bottom: 28px; }
  .article-entry { grid-template-columns: 1fr; gap: 26px; padding-block: 24px; }
  .article-entry-media { max-width: 540px; }
  .publication-footer { margin-top: 48px; }
  .help-layout { grid-template-columns: 1fr; gap: 32px; }
  .help-intro { margin: 28px 0; }
  .help-topics { position: static; padding-bottom: 20px; border-bottom: 1px solid var(--publication-rule); }
  .help-topics nav { flex-direction: row; flex-wrap: wrap; gap: 4px 24px; }
  .help-topic h2 { font-size: 24px; }
  .help-question h3 { font-size: 19px; }
}

@media (max-width: 480px) {
  .publication-shell { width: calc(100% - 40px); }
  .publication-header > .publication-shell { min-height: 76px; gap: 12px; }
  .publication-brand { gap: 8px; }
  .publication-brand img { width: 36px; height: 36px; }
  .publication-brand strong { font-size: 15px; }
  .publication-brand small { font-size: 8px; }
  .publication-nav { gap: 16px; }
  .publication-nav a { font-size: 13px; }
  .article-wayfinding { width: calc(100% - 40px); margin-top: 24px; }
}

@media print {
  .publication-header, .publication-footer, .article-wayfinding, .publication-skip { display: none; }
}