:root {
  --ink: #172033;
  --muted: #667085;
  --line: #dce4ef;
  --blue: #1769aa;
  --blue-dark: #123e68;
  --blue-soft: #edf6ff;
  --green: #248567;
  --green-soft: #edf9f4;
  --surface: #ffffff;
  --canvas: #f6f8fb;
  --shadow: 0 14px 36px rgba(22, 56, 92, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font: 15px/1.8 "Microsoft YaHei", "Segoe UI", sans-serif;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
code {
  padding: 2px 6px;
  border-radius: 4px;
  color: #244565;
  background: #edf3f8;
  font-family: Consolas, monospace;
}
.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(220, 228, 239, .9);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(12px);
}
.nav-wrap {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--blue-dark); font-weight: 700; }
.brand-mark {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  overflow: hidden;
  color: transparent;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue) 58%, var(--green));
  font-size: 0;
}
.brand-mark::after { content: ""; width: 14px; height: 14px; border: 3px solid rgba(255, 255, 255, .9); border-radius: 50%; }
.site-nav { display: flex; flex-wrap: wrap; gap: 6px; }
.site-nav a { padding: 8px 12px; border-radius: 7px; color: #526174; font-size: 14px; }
.site-nav a:hover, .site-nav .active { color: var(--blue-dark); background: var(--blue-soft); }
.hero {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #eff7ff 0%, #fff 52%, #eef9f5 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr);
  gap: 58px;
  align-items: center;
  padding: 86px 0 76px;
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
}
h1, h2, h3 { color: #17324e; line-height: 1.35; }
h1 { margin: 0; font-size: clamp(38px, 5vw, 62px); letter-spacing: -.04em; }
h2 { margin: 0; font-size: 28px; }
h3 { margin: 0; font-size: 18px; }
.hero-subtitle { margin: 12px 0 0; color: var(--blue); font-size: 21px; font-weight: 700; }
.hero-copy { max-width: 730px; margin: 18px 0 0; color: #526174; font-size: 16px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  min-height: 42px;
  padding: 9px 16px;
  align-items: center;
  border: 1px solid var(--blue);
  border-radius: 7px;
  font-size: 14px;
  font-weight: 700;
}
.button.primary { color: #fff; background: var(--blue); }
.button.secondary { color: var(--blue); background: #fff; }
.button:hover { transform: translateY(-1px); box-shadow: 0 8px 18px rgba(23, 105, 170, .13); }
.hero-note {
  padding: 24px;
  border: 1px solid rgba(23, 105, 170, .15);
  border-radius: 12px;
  background: rgba(255, 255, 255, .82);
  box-shadow: var(--shadow);
}
.note-label { margin: 0 0 7px; color: var(--blue); font: 700 12px/1 Consolas, monospace; letter-spacing: .18em; }
.hero-note h2 { font-size: 21px; }
.hero-note p { color: var(--muted); }
.code-lines { display: grid; gap: 7px; margin-top: 16px; color: #4d6075; font: 13px/1.6 Consolas, monospace; }
.code-lines b { margin-right: 8px; color: var(--green); }
.section { padding-top: 74px; padding-bottom: 74px; }
.section-tint { border-block: 1px solid var(--line); background: #eef4fa; }
.section-heading { max-width: 720px; margin-bottom: 28px; }
.section-heading p:last-child { margin: 8px 0 0; color: var(--muted); }
.row-heading { display: flex; max-width: none; align-items: end; justify-content: space-between; gap: 24px; }
.card-grid { display: grid; gap: 16px; }
.card-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.topic-card, .content-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}
.topic-card:hover, .content-card:hover { border-color: #b6cee4; box-shadow: var(--shadow); }
.topic-index { display: block; margin-bottom: 22px; color: var(--green); font: 700 13px/1 Consolas, monospace; }
.topic-card p, .content-card p { margin-bottom: 0; color: var(--muted); }
.text-link { color: var(--blue); font-weight: 700; }
.article-list {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}
.article-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr) 100px;
  gap: 16px;
  padding: 17px 20px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}
.article-row:last-child { border-bottom: 0; }
.article-row:hover { background: #f8fbff; }
.article-category, .tag {
  width: fit-content;
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--green);
  background: var(--green-soft);
  font-size: 12px;
  font-weight: 700;
}
.article-row time { color: #8692a0; font-size: 13px; text-align: right; }
.guide-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .95fr);
  gap: 34px;
  align-items: center;
  padding: 32px;
  border: 1px solid #c9dced;
  border-radius: 12px;
  background: linear-gradient(135deg, #f1f8ff, #fff);
}
.guide-callout p { color: var(--muted); }
.guide-callout img { border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); }
.page-hero { padding: 54px 0 46px; border-bottom: 1px solid var(--line); background: linear-gradient(135deg, #eff7ff, #fff); }
.page-hero h1 { font-size: clamp(32px, 4vw, 48px); }
.page-hero p:last-child { max-width: 760px; margin-bottom: 0; color: var(--muted); }
.page-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 34px;
  padding-top: 40px;
  padding-bottom: 74px;
}
.side-nav {
  position: sticky;
  top: 92px;
  height: fit-content;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
}
.side-nav strong { display: block; margin-bottom: 8px; color: var(--blue-dark); }
.side-nav a { display: block; padding: 6px 0; color: var(--muted); font-size: 13px; }
.side-nav a:hover, .side-nav .active { color: var(--blue); }
.content { min-width: 0; }
.content section, .article-body {
  margin-bottom: 20px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}
.content h2 { margin-bottom: 12px; font-size: 24px; }
.content h3 { margin-top: 24px; margin-bottom: 7px; }
.content p { color: #4e5f71; }
.content li { margin: 5px 0; color: #4e5f71; }
.content ol, .content ul { padding-left: 22px; }
.callout {
  margin: 16px 0;
  padding: 13px 15px;
  border-left: 4px solid var(--blue);
  background: var(--blue-soft);
  color: #3e5d79;
}
.callout.green { border-color: var(--green); background: var(--green-soft); }
.flow-list { display: grid; gap: 12px; }
.flow-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}
.flow-card strong { display: block; margin-bottom: 10px; color: var(--blue-dark); }
.flow-steps { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.flow-steps span {
  padding: 6px 11px;
  border-radius: 6px;
  color: #315d83;
  background: var(--blue-soft);
  font-size: 14px;
}
.flow-steps b { color: var(--green); font-size: 16px; }
.shot {
  margin: 18px 0 4px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}
.shot img { display: block; width: 100%; border-radius: 4px; }
.tutorial-list, .index-list { display: grid; gap: 12px; }
.tutorial-item, .index-item {
  display: flex;
  gap: 14px;
  padding: 16px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.tutorial-item:hover, .index-item:hover { border-color: #a9c8e4; background: #fafdff; }
.item-number { color: var(--green); font: 700 13px/1.8 Consolas, monospace; }
.tutorial-item p, .index-item p { margin: 3px 0 0; color: var(--muted); font-size: 14px; }
.meta-line { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 0; color: var(--muted); font-size: 13px; }
.article-body { max-width: 860px; }
.article-body h2 { margin-top: 30px; font-size: 22px; }
.article-body h2:first-child { margin-top: 0; }
.article-body p, .article-body li { color: #46586a; }
.related { display: grid; gap: 8px; padding: 0; list-style: none; }
.related a { color: var(--blue); }
.qr-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 280px)); gap: 18px; margin-top: 20px; }
.qr-card { padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: #fff; text-align: center; }
.qr-card img { width: 220px; height: 220px; object-fit: contain; }
.qr-card h3 { margin-top: 10px; }
.qr-card p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
.site-footer { padding: 28px 0; border-top: 1px solid var(--line); background: #fff; }
.site-footer p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; }
.filing { display: flex; flex-wrap: wrap; justify-content: end; gap: 8px 16px; color: #8491a1; font-size: 12px; }

@media (max-width: 900px) {
  .hero-grid, .guide-callout { grid-template-columns: 1fr; }
  .card-grid.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-layout { grid-template-columns: 1fr; }
  .side-nav { position: static; }
}
@media (max-width: 640px) {
  .shell { width: min(100% - 28px, 1160px); }
  .nav-wrap { display: block; padding: 14px 0 10px; }
  .site-nav { margin-top: 10px; gap: 2px; }
  .site-nav a { padding: 6px 8px; }
  .hero-grid { gap: 24px; padding: 60px 0 52px; }
  .card-grid.four, .qr-grid { grid-template-columns: 1fr; }
  .article-row { display: block; }
  .article-row strong { display: block; margin: 8px 0 5px; }
  .article-row time { display: block; text-align: left; }
  .section { padding-top: 54px; padding-bottom: 54px; }
  .row-heading { display: block; }
  .footer-grid { display: block; }
  .filing { margin-top: 12px; justify-content: start; }
}