:root {
  color-scheme: light;
  --brand: #ee3c23;
  --brand-soft: #ffeae8;
  --text: #333333;
  --muted: #666666;
  --quiet: #999999;
  --page: #f5f4f5;
  --card: #ffffff;
  --divider: #eeeeee;
  --content: 1180px;
  --radius: 12px;
  --font: "PingFang SC", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page);
  color: var(--muted);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin: 0; }

.site-header { background: var(--card); }
.topbar, .hero, main, footer {
  width: min(var(--content), calc(100% - 32px));
  margin-inline: auto;
}
.topbar {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--divider);
}
.brand { display: flex; min-height: 44px; align-items: center; gap: 12px; color: var(--text); font-weight: 700; }
.brand-mark { color: var(--brand); font-size: 18px; letter-spacing: -.04em; }
.manual-count { padding: 5px 12px; border-radius: 999px; background: var(--brand-soft); color: var(--brand); font-size: 12px; font-weight: 700; }

.hero { padding-block: 52px 58px; }
.eyebrow { display: flex; align-items: center; gap: 8px; color: var(--brand); font-size: 12px; font-weight: 700; }
.eyebrow span { width: 20px; height: 2px; background: var(--brand); }
.hero h1 { margin-top: 12px; color: var(--text); font-size: clamp(30px, 4vw, 44px); line-height: 1.2; letter-spacing: -.03em; }
.hero > p:not(.eyebrow) { max-width: 760px; margin-top: 14px; font-size: 16px; line-height: 1.75; }
.search-box {
  display: flex;
  width: min(100%, 620px);
  min-height: 52px;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding: 0 18px;
  border: 1px solid #dddddd;
  border-radius: 999px;
  background: #fafafa;
}
.search-box:focus-within { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(238,60,35,.12); }
.search-box span { color: var(--quiet); font-size: 24px; }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); font: inherit; font-size: 16px; }
.search-box input::placeholder { color: var(--quiet); }

main { display: grid; gap: 24px; padding-block: 32px 64px; }
.manual-section { padding: 30px; border: 1px solid var(--divider); border-radius: var(--radius); background: var(--card); }
.section-heading { display: flex; align-items: center; gap: 14px; padding-bottom: 20px; border-bottom: 1px solid var(--divider); }
.section-heading > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font-weight: 800; }
.section-heading p { color: var(--brand); font-size: 10px; line-height: 14px; font-weight: 800; letter-spacing: .12em; }
.section-heading h2 { color: var(--text); font-size: 21px; line-height: 30px; }
.manual-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 20px; }
.manual-card {
  display: flex;
  min-height: 168px;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--divider);
  border-radius: 10px;
  background: #ffffff;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}
.manual-card:hover, .manual-card:focus-visible {
  border-color: rgba(238,60,35,.42);
  box-shadow: 0 10px 26px rgba(30,30,30,.08);
  transform: translateY(-2px);
  outline: 0;
}
.manual-card h3 { color: var(--text); font-size: 18px; line-height: 28px; }
.manual-card p { margin-top: 8px; color: var(--quiet); }
.manual-card span { margin-top: auto; padding-top: 18px; color: var(--brand); font-weight: 700; }
.manual-card[hidden], .manual-section[hidden] { display: none; }
.empty-state { padding: 32px; border-radius: var(--radius); background: var(--card); text-align: center; }

footer {
  display: flex;
  min-height: 92px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--divider);
}
footer strong { color: var(--brand); }
footer span { color: var(--quiet); }

@media (max-width: 860px) {
  .manual-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .topbar, .hero, main, footer { width: min(100% - 20px, var(--content)); }
  .brand { gap: 8px; font-size: 13px; }
  .hero { padding-block: 36px 42px; }
  .hero > p:not(.eyebrow) { font-size: 15px; }
  main { padding-block: 20px 44px; }
  .manual-section { padding: 20px 16px; }
  .manual-grid { grid-template-columns: 1fr; }
  .manual-card { min-height: 150px; }
  footer { flex-direction: column; justify-content: center; gap: 4px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}