/* Set 1 — 根域名：手册体，左侧目录 + 主栏，海军蓝 / 金色 */
:root {
  --ink: #122033;
  --muted: #5a6573;
  --navy: #0b1f3a;
  --gold: #c9a227;
  --gold-deep: #a78416;
  --paper: #f7f4ec;
  --card: #ffffff;
  --line: #d8d2c2;
  --ok: #2f6b4f;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: auto; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Palatino Linotype", Palatino, "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", serif;
  font-size: 17px;
  line-height: 1.85;
}

img, svg { max-width: 100%; vertical-align: middle; }

a { color: #7a5d10; text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--gold-deep); }

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 12px; z-index: 80; }

.topbar {
  background: var(--navy);
  color: #f3ead2;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.topbar-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 8px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.topbar a { color: #f3ead2; text-decoration: none; }
.topbar a:hover { color: var(--gold); }

.site-header {
  background: #fffdf6;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
}
.header-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--navy);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
}
.brand:hover { color: var(--navy); }
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--navy);
  display: grid;
  place-items: center;
}

.nav-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  text-decoration: none;
  color: var(--ink);
  padding: 8px 14px;
  border-bottom: 2px solid transparent;
}
.nav-list a:hover,
.nav-list a.is-current {
  border-bottom-color: var(--gold);
  color: var(--navy);
}

.layout {
  width: min(1180px, calc(100% - 32px));
  margin: 28px auto 64px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 36px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 92px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 18px 16px;
}
.toc h2 {
  font-size: 15px;
  margin: 0 0 10px;
  color: var(--navy);
}
.toc ol {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
}
.toc a { text-decoration: none; color: var(--muted); }
.toc a:hover { color: var(--gold-deep); }

.hero {
  background: var(--navy);
  color: #f6efe0;
  padding: 36px 32px;
  margin-bottom: 28px;
}
.hero .kicker {
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.35;
}
.hero p { margin: 0 0 14px; color: #e6dcc0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  text-decoration: none;
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 15px;
}
.btn-official {
  background: var(--gold);
  color: #1b1404;
}
.btn-official:hover { background: #ddb42d; color: #1b1404; }
.btn-ghost {
  background: transparent;
  color: #f6efe0;
  border-color: #c9b888;
}
.btn-ghost:hover { color: var(--gold); }
.btn-line {
  background: #fff;
  color: var(--navy);
  border-color: var(--navy);
}
.btn-line:hover { background: var(--navy); color: #fff; }

.chapter { margin: 0 0 40px; }
.chapter-kicker {
  margin: 0 0 6px;
  color: var(--gold-deep);
  font-size: 13px;
  letter-spacing: 0.12em;
}
.chapter h2 {
  margin: 0 0 14px;
  font-size: 26px;
  color: var(--navy);
  line-height: 1.4;
}
.chapter h3 {
  margin: 22px 0 10px;
  font-size: 19px;
  color: var(--ink);
}
.chapter p { margin: 0 0 14px; }

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 16px 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 16px 16px 8px;
}
.card h3 { margin-top: 8px; }

.platform-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.platform {
  border: 1px solid var(--line);
  background: #fff;
  padding: 16px;
}
.platform h3 { margin: 8px 0; font-size: 18px; }

.review {
  background: #fff;
  border-left: 4px solid var(--gold);
  padding: 8px 18px 4px;
  margin: 16px 0;
}
.review footer {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 12px;
}

.table-wrap { overflow-x: auto; margin: 16px 0 20px; }
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  font-size: 15px;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: #efe8d4; color: var(--navy); }

.notice {
  background: #fff8e3;
  border: 1px solid #e2cf8a;
  padding: 14px 16px;
  margin: 16px 0;
}
.notice strong { color: var(--navy); }

.faq-list { margin: 0; }
.faq-list dt {
  font-weight: 700;
  margin: 18px 0 6px;
  color: var(--navy);
}
.faq-list dd { margin: 0 0 8px; }

.cta-band {
  background: var(--navy);
  color: #f6efe0;
  padding: 28px 24px;
  margin: 28px 0 8px;
}
.cta-band h2 { color: #f6efe0; }
.cta-band a.btn-official { text-decoration: none; }

.site-footer {
  background: var(--navy);
  color: #d7d0be;
  padding: 36px 0 28px;
  font-size: 14px;
}
.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 28px;
}
.site-footer a { color: #f0e2b0; }
.legal { margin-top: 16px; color: #b7b09e; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: static; }
  .card-grid,
  .platform-list,
  .footer-inner { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; align-items: flex-start; padding: 12px 0; }
}

.dl-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 16px 0 8px;
}
.dl-strip .btn {
  justify-content: center;
  text-align: center;
  width: 100%;
}
@media (max-width: 760px) {
  .dl-strip { grid-template-columns: 1fr 1fr; }
}

.btn.is-loading {
  opacity: 0.72;
  pointer-events: none;
}