:root {
  --purple: #5b4ee6;
  --purple-dark: #443a9f;
  --purple-light: #eeecfb;
  --ink: #1f2330;
  --ink-soft: #5a5f73;
  --line: #e5e6ee;
  --bg: #ffffff;
  --bg-soft: #f7f7fb;
  --radius: 10px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.page-narrow { max-width: 900px; }

a { color: var(--purple); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Header ---- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
  flex-wrap: wrap;
}
.logo { display: flex; align-items: center; gap: 10px; color: var(--ink); font-size: 18px; }
.logo:hover { text-decoration: none; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, var(--purple), #8f7bff);
  color: #fff; font-weight: 700; font-size: 18px;
}
.logo-text b { color: var(--purple); }
.header-nav { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.header-nav a { color: var(--ink-soft); font-size: 14.5px; }
.header-nav a.active { color: var(--purple); font-weight: 600; }

.btn {
  display: inline-block; border-radius: 8px; padding: 8px 16px;
  font-size: 14.5px; border: none; cursor: pointer;
}
.btn-primary { background: var(--purple); color: #fff; font-weight: 600; }
.btn-primary:hover { background: var(--purple-dark); text-decoration: none; color:#fff; }
.btn-outline { border: 1px solid var(--purple); color: var(--purple); }
.btn-outline:hover { background: var(--purple-light); text-decoration: none; }

/* ---- Hero ---- */
.hero {
  background:
    radial-gradient(1200px 400px at 70% -50%, rgba(91, 78, 230, 0.10), transparent),
    linear-gradient(180deg, #fbfaff 0%, #ffffff 100%);
  padding: 56px 0 40px;
}
.hero h1 { text-align: center; font-size: 40px; margin: 0 0 8px; }
.hero-sub { text-align: center; color: var(--ink-soft); margin: 0 0 28px; font-size: 17px; }

.search-form { max-width: 680px; margin: 0 auto; position: relative; }
.search-box {
  display: flex; align-items: center; gap: 8px;
  background: #fff; border: 2px solid var(--line); border-radius: 12px;
  padding: 8px 8px 8px 16px;
  box-shadow: 0 6px 24px rgba(31, 35, 48, 0.06);
}
.search-box:focus-within { border-color: var(--purple); }
.search-icon { opacity: 0.6; }
.search-box input {
  flex: 1; border: none; outline: none; font-size: 16px; padding: 8px 4px;
  background: transparent; min-width: 120px;
}
.search-suggest {
  position: absolute; left: 0; right: 0; top: calc(100% + 6px);
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 10px 30px rgba(31, 35, 48, 0.12);
  max-height: 320px; overflow: auto; z-index: 20;
}
.search-suggest a {
  display: block; padding: 9px 14px; color: var(--ink); font-size: 14.5px;
}
.search-suggest a:hover { background: var(--purple-light); text-decoration: none; }
.search-suggest .sug-cat { color: var(--ink-soft); font-size: 12.5px; margin-left: 8px; }

/* ---- Category tiles ---- */
.cat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px; margin-top: 40px;
}
.cat-tile {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px 14px; display: flex; flex-direction: column; gap: 6px;
  background: #fff; transition: border-color .15s, box-shadow .15s;
  color: var(--ink);
}
.cat-tile:hover {
  text-decoration: none; border-color: var(--purple);
  box-shadow: 0 6px 20px rgba(91, 78, 230, 0.12);
}
.cat-icon { font-size: 26px; }
.cat-name { font-weight: 700; font-size: 16.5px; }
.cat-desc { color: var(--ink-soft); font-size: 13.5px; flex: 1; }
.cat-count { color: var(--purple); font-size: 13px; font-weight: 600; }

/* ---- Pages ---- */
.page-with-nav {
  display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 32px;
  padding-top: 28px; padding-bottom: 48px;
}
.page-article {
  display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 36px;
  padding-top: 28px; padding-bottom: 48px; max-width: 1080px;
}
@media (max-width: 980px) {
  .page-with-nav, .page-article { grid-template-columns: 1fr; }
  .side-nav, .toc { display: none; }
}
.page-narrow { padding-top: 28px; padding-bottom: 48px; }

.side-nav { border-right: 1px solid var(--line); padding-right: 16px; }
.side-nav-title {
  font-size: 12px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--ink-soft); margin-bottom: 10px;
}
.side-nav a {
  display: block; padding: 7px 10px; border-radius: 8px;
  color: var(--ink); font-size: 14.5px; margin-bottom: 2px;
}
.side-nav a:hover { background: var(--bg-soft); text-decoration: none; }
.side-nav a.active { background: var(--purple-light); color: var(--purple-dark); font-weight: 600; }

.breadcrumbs { font-size: 13.5px; color: var(--ink-soft); margin-bottom: 14px; }
.breadcrumbs span { margin: 0 6px; }
.breadcrumbs a { color: var(--ink-soft); }

h1 { font-size: 32px; margin: 0 0 10px; line-height: 1.25; }
.lead { color: var(--ink-soft); font-size: 16.5px; margin-top: 0; }

/* ---- Article list ---- */
.article-list { list-style: none; padding: 0; margin: 22px 0; }
.article-list li {
  padding: 14px 4px; border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 4px;
}
.article-link { font-weight: 600; font-size: 16.5px; }
.article-summary { color: var(--ink-soft); font-size: 14.5px; }
.result-cat {
  align-self: flex-start; font-size: 12px; color: var(--purple-dark);
  background: var(--purple-light); border-radius: 20px; padding: 2px 10px;
}

/* ---- Article body ---- */
.article-body { font-size: 15.5px; }
.article-body h2 { margin-top: 34px; padding-top: 6px; font-size: 23px; }
.article-body h3 { margin-top: 26px; font-size: 18.5px; }
.article-body h2, .article-body h3 { position: relative; }
.h-anchor {
  position: absolute; left: -20px; opacity: 0; color: var(--purple);
  font-weight: 400; transition: opacity .15s;
}
h2:hover .h-anchor, h3:hover .h-anchor { opacity: 0.7; }
.article-body code {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 5px; padding: 1px 6px; font-size: 13.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.article-body pre {
  background: #161822; color: #e6e6f0; border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; line-height: 1.5;
}
.article-body pre code { background: none; border: none; color: inherit; padding: 0; font-size: 13.5px; }
.article-body table { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article-body th { background: var(--bg-soft); }
.article-body blockquote {
  margin: 16px 0; padding: 10px 16px; border-left: 3px solid var(--purple);
  background: var(--purple-light); border-radius: 0 8px 8px 0; color: var(--purple-dark);
}
.article-body ul { padding-left: 22px; }
.article-body li { margin-bottom: 6px; }
.article-tools { font-size: 13.5px; margin: 6px 0 18px; }
.article-footer-help {
  margin-top: 36px; padding: 14px 18px; background: var(--bg-soft);
  border-radius: var(--radius); font-size: 14.5px;
}
.related { margin-top: 34px; }
.related h3 { margin-bottom: 8px; }
.related ul { list-style: none; padding: 0; }
.related li { padding: 8px 0; border-bottom: 1px dashed var(--line); }

.note {
  background: var(--purple-light); border-radius: 8px;
  padding: 10px 14px; font-size: 14.5px;
}

/* ---- TOC ---- */
.toc { font-size: 13.5px; position: sticky; top: 84px; align-self: start; }
.toc-title { font-weight: 700; margin-bottom: 8px; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin-bottom: 5px; }
.toc li.toc-3 { padding-left: 14px; }
.toc a { color: var(--ink-soft); }
.toc a:hover { color: var(--purple); }

/* ---- API reference ---- */
.api-table { border-collapse: collapse; width: 100%; margin: 14px 0 30px; font-size: 14px; }
.api-table th, .api-table td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.api-table th { background: var(--bg-soft); }
.api-table code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; }
.http-method {
  font-weight: 700; padding: 2px 8px; border-radius: 5px; color: #fff;
  font-size: 11.5px; letter-spacing: .04em;
}
.http-method.m-get { background: #2e7d32; }
.http-method.m-post { background: #1565c0; }
.http-method.m-put { background: #ef6c00; }
.http-method.m-delete { background: #c62828; }
.api-group h2 { margin-top: 30px; padding-bottom: 6px; border-bottom: 2px solid var(--purple-light); }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--line); background: var(--bg-soft);
  margin-top: 40px; padding: 34px 0 0; font-size: 14px;
}
.footer-cols {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px;
}
@media (max-width: 800px) { .footer-cols { grid-template-columns: 1fr 1fr; } }
.footer-brand { font-size: 16px; margin-bottom: 8px; }
.site-footer p { color: var(--ink-soft); margin: 0; }
.site-footer h4 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); }
.site-footer a { display: block; color: var(--ink); margin-bottom: 7px; font-size: 14px; }
.footer-bottom { color: var(--ink-soft); padding: 20px; }

.empty { color: var(--ink-soft); padding: 18px 4px; }