/* 第1套：场景驱动 · 阅读栏 + 场景横带 */
:root {
  --ink: #1c2430;
  --muted: #5b6574;
  --line: #d7deea;
  --paper: #f4f7fb;
  --card: #ffffff;
  --brand: #1a5fb4;
  --brand-dark: #134a8a;
  --sand: #eef3fa;
  --warn: #8a5a12;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
}

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

.topbar {
  background: #123a70;
  color: #e8eef8;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 8px 0;
}
.topbar .wrap { display: flex; justify-content: space-between; }

.brand-row {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand-row .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 22px;
}
.logo svg { display: block; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 22px;
  font-size: 15px;
}
nav a.current {
  color: var(--brand);
  border-bottom: 2px solid var(--brand);
  padding-bottom: 4px;
}

.wrap { width: min(820px, calc(100% - 40px)); margin: 0 auto; }
.wrap-wide { width: min(1100px, calc(100% - 40px)); margin: 0 auto; }

.hero {
  background: linear-gradient(180deg, #e7eef8 0%, var(--paper) 100%);
  padding: 48px 0 28px;
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
  line-height: 1.35;
  margin: 0 0 16px;
}
.hero .lead { font-size: 17px; color: #2c3644; }
.hero .traits {
  margin: 18px 0 0;
  padding-left: 18px;
}
.hero .cta-row { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero .sub-links a { color: var(--brand); margin-right: 16px; }

.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 4px;
}
.btn:hover { background: var(--brand-dark); }
.btn.ghost {
  background: transparent;
  color: var(--brand);
  border: 1px solid var(--brand);
}

.scene-band {
  background: var(--sand);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
  font-size: 14px;
  color: var(--muted);
}
.scene-band span { margin-right: 18px; }

main { padding: 36px 0 64px; }
section { margin: 0 0 42px; }
h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  border-left: 4px solid var(--brand);
  padding-left: 12px;
  margin: 0 0 14px;
}
p { margin: 0 0 14px; }
.note {
  background: #fff8e8;
  border: 1px solid #ecd7a3;
  color: var(--warn);
  padding: 12px 14px;
  margin: 14px 0;
}
.pull {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  font-style: italic;
  color: #334155;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  margin: 14px 0 20px;
}
th, td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
th { background: #e8eef8; }
ol, ul { margin: 0 0 14px; padding-left: 22px; }
.mid-cta, .end-cta {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 18px;
  margin: 28px 0;
}
.faq dt { font-weight: 700; margin-top: 16px; }
.faq dd { margin: 6px 0 0; }
footer {
  background: #123a70;
  color: #d5deeb;
  padding: 28px 0;
  font-size: 13px;
  line-height: 1.7;
}
footer p { margin: 0 0 8px; }

@media (max-width: 720px) {
  .hero h1 { font-size: 26px; }
  .brand-row .wrap { flex-direction: column; align-items: flex-start; gap: 12px; }
  nav a { margin-left: 0; margin-right: 14px; }
}