:root {
  --blue: #1874c7;
  --blue-dark: #0f4f90;
  --blue-pale: #edf6ff;
  --ink: #1f2937;
  --muted: #657184;
  --line: #dce3ea;
  --surface: #ffffff;
  --background: #f5f7fa;
  --warning: #8a5a00;
  --warning-bg: #fff8e6;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--background); line-height: 1.65; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); text-decoration: underline; }

.hero { color: #fff; background: linear-gradient(135deg, #103e70 0%, #1874c7 58%, #38a1db 100%); }
.hero__inner { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 70px 0 64px; }
.eyebrow { margin-bottom: 12px; font-size: 13px; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; opacity: .78; }
.hero h1 { margin: 0; font-size: clamp(34px, 6vw, 58px); line-height: 1.13; letter-spacing: -.025em; }
.hero p { max-width: 760px; margin: 20px 0 0; font-size: 18px; opacity: .88; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 20px; color: #fff; border: 1px solid rgba(255,255,255,.46); border-radius: 8px; font-weight: 650; }
.button:hover { color: #fff; background: rgba(255,255,255,.12); text-decoration: none; }
.button--primary { color: var(--blue-dark); background: #fff; border-color: #fff; }
.button--primary:hover { color: var(--blue-dark); background: #edf6ff; }

.layout { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 34px 0 70px; }
.notice { padding: 15px 18px; color: var(--warning); background: var(--warning-bg); border: 1px solid #f0d58b; border-radius: 9px; }
.toolbar { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin: 34px 0 4px; }
.search { display: block; width: min(480px, 100%); color: var(--muted); font-size: 13px; font-weight: 700; }
.search span { display: block; margin-bottom: 7px; }
.search input { width: 100%; height: 44px; padding: 0 13px; color: var(--ink); background: #fff; border: 1px solid #cfd8e3; border-radius: 8px; outline: none; font: inherit; font-weight: 400; }
.search input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(24,116,199,.12); }
.doc-count { color: var(--muted); font-size: 13px; white-space: nowrap; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin: 48px 0 18px; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.section-heading h2 { margin: 2px 0 0; font-size: 25px; line-height: 1.3; }
.section-heading p { margin: 0; color: var(--muted); font-size: 14px; text-align: right; }
.section-kicker { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.section-kicker--muted { color: #8b95a5; }
.doc-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.doc-card { display: flex; flex-direction: column; min-height: 222px; padding: 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 2px 10px rgba(31,41,55,.035); }
.doc-card:hover { border-color: #b8cee2; box-shadow: 0 8px 24px rgba(31,76,116,.08); transform: translateY(-1px); }
.doc-card__meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: #8b95a5; font-size: 11px; }
.tag { padding: 3px 8px; color: var(--blue-dark); background: var(--blue-pale); border-radius: 999px; font-weight: 700; }
.doc-card h3 { margin: 16px 0 9px; font-size: 18px; line-height: 1.42; }
.doc-card h3 a { color: var(--ink); }
.doc-card p { margin: 0; color: var(--muted); font-size: 14px; }
.doc-card__actions { display: flex; gap: 18px; margin-top: auto; padding-top: 18px; font-size: 13px; font-weight: 650; }
.empty { grid-column: 1 / -1; padding: 32px; color: var(--muted); text-align: center; background: #fff; border: 1px dashed var(--line); border-radius: 10px; }
.footer { padding: 25px 20px; color: #8792a2; text-align: center; border-top: 1px solid var(--line); font-size: 13px; }

.viewer-page { background: #fff; }
.viewer-bar { position: sticky; z-index: 20; top: 0; display: flex; align-items: center; justify-content: space-between; height: 58px; padding: 0 24px; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.viewer-bar__actions { display: flex; align-items: center; gap: 16px; font-size: 13px; }
.viewer-bar button { display: none; padding: 6px 12px; color: var(--blue); background: var(--blue-pale); border: 0; border-radius: 6px; }
.back-link { font-size: 14px; font-weight: 650; }
.viewer-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); max-width: 1460px; min-height: calc(100vh - 58px); margin: 0 auto; }
.toc { position: sticky; top: 58px; align-self: start; max-height: calc(100vh - 58px); padding: 28px 20px 40px; overflow: auto; border-right: 1px solid var(--line); }
.toc__title { margin-bottom: 12px; font-size: 13px; font-weight: 800; }
.toc__item { display: block; padding: 5px 8px; color: #5f6c7b; border-left: 2px solid transparent; font-size: 12px; line-height: 1.45; }
.toc__item:hover { color: var(--blue); background: var(--blue-pale); border-left-color: var(--blue); text-decoration: none; }
.toc__item--2 { padding-left: 17px; }
.toc__item--3 { padding-left: 28px; color: #7d8795; }
.toc__empty { color: var(--muted); font-size: 13px; }
.markdown-shell { min-width: 0; padding: 45px clamp(24px, 5vw, 78px) 90px; }
.viewer-state { padding: 50px 0; color: var(--muted); text-align: center; }
.viewer-state--error { color: #b42318; }
.markdown-body { max-width: 980px; margin: 0 auto; color: #242d38; font-size: 15px; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { position: relative; scroll-margin-top: 75px; color: #17202b; line-height: 1.35; }
.markdown-body h1 { margin: 0 0 28px; padding-bottom: 16px; border-bottom: 1px solid var(--line); font-size: 38px; }
.markdown-body h2 { margin: 48px 0 18px; padding-bottom: 9px; border-bottom: 1px solid var(--line); font-size: 27px; }
.markdown-body h3 { margin: 32px 0 14px; font-size: 21px; }
.markdown-body h4 { margin: 25px 0 12px; font-size: 17px; }
.markdown-body p { margin: 11px 0; }
.markdown-body ul, .markdown-body ol { margin: 10px 0; padding-left: 27px; }
.markdown-body li { margin: 5px 0; }
.markdown-body code { padding: 2px 5px; color: #b42318; background: #f6f8fa; border: 1px solid #e8ebef; border-radius: 4px; font-family: SFMono-Regular, Consolas, "Liberation Mono", monospace; font-size: .88em; }
.markdown-body pre { max-width: 100%; padding: 17px; overflow: auto; color: #e6edf3; background: #161b22; border-radius: 8px; line-height: 1.5; }
.markdown-body pre code { padding: 0; color: inherit; background: transparent; border: 0; }
.markdown-body blockquote { margin: 18px 0; padding: 4px 16px; color: #526071; border-left: 4px solid #b7c8da; }
.markdown-body img { max-width: 100%; height: auto; }
.anchor { margin-left: 7px; color: transparent; font-size: .7em; }
.markdown-body h1:hover .anchor, .markdown-body h2:hover .anchor, .markdown-body h3:hover .anchor { color: #9aabc0; text-decoration: none; }
.table-wrap { max-width: 100%; margin: 16px 0 24px; overflow-x: auto; border: 1px solid var(--line); border-radius: 7px; }
.markdown-body table { width: 100%; border-collapse: collapse; font-size: 13px; line-height: 1.55; }
.markdown-body th { color: #29384a; background: #f4f7fa; font-weight: 750; text-align: left; }
.markdown-body th, .markdown-body td { min-width: 90px; padding: 9px 11px; vertical-align: top; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.markdown-body tr:last-child td { border-bottom: 0; }
.markdown-body th:last-child, .markdown-body td:last-child { border-right: 0; }
.markdown-body hr { height: 1px; margin: 32px 0; background: var(--line); border: 0; }

@media (max-width: 900px) {
  .doc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .viewer-layout { display: block; }
  .toc { position: fixed; z-index: 30; top: 58px; right: 0; bottom: 0; left: 0; display: none; max-height: none; background: #fff; border: 0; }
  .toc--open { display: block; }
  .viewer-bar button { display: inline-block; }
  .markdown-shell { padding-top: 30px; }
}

@media (max-width: 620px) {
  .hero__inner, .layout { width: min(100% - 28px, 1180px); }
  .hero__inner { padding: 48px 0 44px; }
  .hero h1 { font-size: 36px; }
  .hero p { font-size: 16px; }
  .toolbar, .section-heading { display: block; }
  .doc-count { margin-top: 9px; }
  .section-heading p { margin-top: 7px; text-align: left; }
  .doc-grid { grid-template-columns: 1fr; }
  .viewer-bar { padding: 0 14px; }
  .viewer-bar__actions { gap: 10px; }
  .markdown-shell { padding: 25px 17px 70px; }
  .markdown-body { font-size: 14px; }
  .markdown-body h1 { font-size: 29px; }
  .markdown-body h2 { font-size: 23px; }
}