/* 第1套：场景驱动 — 横向顶栏 + 左侧场景索引 + 暖色纸面 */
:root {
  --ink: #1e3a5f;
  --paper: #f4efe4;
  --panel: #fffdf8;
  --line: #d7cbb6;
  --rust: #b4532a;
  --rust-d: #8c3d1d;
  --mute: #5c5348;
  --ok: #2f6b4f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: #2a261f;
  font: 16px/1.75 "Microsoft YaHei", "PingFang SC", sans-serif;
}

a { color: var(--ink); }
a:hover { color: var(--rust); }

.topbar {
  background: var(--ink);
  color: #f4efe4;
  border-bottom: 4px solid var(--rust);
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 22px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 20px;
  padding-bottom: 12px;
}
.brand svg { flex-shrink: 0; }
.nav {
  display: flex;
  gap: 4px;
}
.nav a {
  color: #d9e2ef;
  text-decoration: none;
  padding: 10px 16px 12px;
  border-bottom: 3px solid transparent;
}
.nav a.on,
.nav a[aria-current="page"] {
  color: #fff;
  border-bottom-color: var(--rust);
  background: rgba(255,255,255,0.06);
}

.hero {
  background: linear-gradient(160deg, #1e3a5f 0%, #2b4d73 60%, #3a3a2a 100%);
  color: #f7f1e6;
  padding: 42px 22px 48px;
}
.hero-inner { max-width: 1180px; margin: 0 auto; }
.hero h1 {
  margin: 0 0 16px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
  line-height: 1.3;
  font-weight: 700;
}
.hero .lead, .hero .trait { max-width: 760px; color: #e8ddc9; }
.hero .trait { margin-top: 10px; }
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn-win { background: var(--rust); color: #fff; }
.btn-mac { background: #c9a227; color: #2a2208; }
.btn-ios { background: #fff; color: var(--ink); }
.btn-and { background: var(--ok); color: #fff; }
.btn-ghost {
  background: transparent;
  color: #f4efe4;
  border-color: #c9b89a;
}
.btn-win:hover, .btn-mac:hover, .btn-ios:hover, .btn-and:hover { filter: brightness(1.06); color: inherit; }
.plat-note { font-size: 13px; color: #d3c4aa; margin-top: 12px; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 22px 60px;
  display: grid;
  grid-template-columns: 232px 1fr;
  gap: 28px;
}
.scene-nav {
  position: sticky;
  top: 16px;
  align-self: start;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px 14px;
}
.scene-nav p {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--mute);
  letter-spacing: 0.08em;
}
.scene-nav a {
  display: block;
  text-decoration: none;
  padding: 7px 8px;
  border-left: 3px solid transparent;
  color: var(--ink);
}
.scene-nav a:hover { border-left-color: var(--rust); background: #f7f0e4; }

.main h2 {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  font-size: 24px;
  margin: 36px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.main p { margin: 0 0 14px; }
.scene-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 5px solid var(--rust);
  padding: 16px 18px 8px;
  margin: 0 0 18px;
}
.hint {
  background: #efe4d0;
  border: 1px dashed var(--rust);
  padding: 12px 14px;
  margin: 0 0 16px;
  color: #4a3a28;
}
.param {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 16px;
  background: var(--panel);
}
.param th, .param td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.param th { background: #e8dcc6; color: var(--ink); }
.steps { margin: 0 0 16px 20px; padding: 0; }
.steps li { margin: 0 0 8px; }
.mid-cta, .end-cta {
  background: #ebe2d2;
  border: 1px solid var(--line);
  padding: 16px 18px;
  margin: 24px 0;
}
.faq { margin: 0 0 18px; }
.faq h3 {
  margin: 18px 0 6px;
  font-size: 17px;
  color: var(--ink);
}
.site-footer {
  background: #16283f;
  color: #d7cbb6;
  padding: 28px 22px 36px;
}
.site-footer .inner { max-width: 1180px; margin: 0 auto; }
.foot-nav { margin: 0 0 12px; }
.foot-nav a { color: #f4efe4; margin-right: 14px; }
.safe { color: #c8e6d4; }
.legal { font-size: 13px; color: #b7aa94; }

@media (max-width: 880px) {
  .wrap { grid-template-columns: 1fr; }
  .scene-nav { position: static; }
  .hero h1 { font-size: 26px; }
}