/* 第1套：官方馆 · 海军蓝 + 金线 · 左右分栏 · 编号章节 */
:root {
  --navy: #0b3d91;
  --navy-deep: #07275c;
  --gold: #c4a35a;
  --gold-soft: #f3ead2;
  --ink: #1a2332;
  --muted: #5a6573;
  --paper: #f6f3ec;
  --card: #ffffff;
  --line: #d8d0c0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: auto; }

body.official {
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.85;
}

h1, h2, h3, .brand-name {
  font-family: "Songti SC", "STSong", "SimSun", Georgia, serif;
  font-weight: 600;
  color: var(--navy-deep);
  line-height: 1.35;
}

p { margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }

a { color: var(--navy); text-underline-offset: 3px; }
a:hover { color: var(--gold); }

svg { display: block; }

.shell {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-head {
  background: var(--navy-deep);
  border-bottom: 3px solid var(--gold);
}

.site-head .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}

.brand-name { color: #fff; font-size: 20px; letter-spacing: 0.04em; }

.menu { display: flex; gap: 28px; }
.menu a {
  color: #d7deea;
  text-decoration: none;
  font-size: 15px;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.menu a:hover { color: var(--gold); }
.menu a.current,
.menu a[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.hero-split {
  padding: 56px 0 48px;
  background:
    linear-gradient(180deg, #e9eef8 0%, var(--paper) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: start;
}

.hero-copy h1 {
  font-size: 36px;
  margin-bottom: 18px;
}

.hero-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--gold);
  padding: 24px 26px;
}

.hero-panel h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.hero-panel li {
  list-style: none;
  padding: 8px 0 8px 22px;
  position: relative;
  color: var(--muted);
  font-size: 14px;
}

.hero-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--gold);
}

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }

.btn {
  appearance: none;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: #fff;
  font-size: 15px;
  padding: 10px 20px;
  cursor: pointer;
  font-family: inherit;
  border-radius: 3px;
}

.btn:hover { background: var(--navy-deep); }
.btn-gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy-deep);
}
.btn-gold:hover { filter: brightness(0.95); }
.btn-line {
  background: transparent;
  color: var(--navy);
}
.btn:disabled { opacity: 0.7; cursor: wait; }

.block { padding: 52px 0; }
.block.tint { background: #efeae0; }
.block.navy {
  background: var(--navy-deep);
  color: #e8edf5;
}
.block.navy h2,
.block.navy h3 { color: #f3ead2; }

.kicker {
  display: inline-block;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.16em;
  margin-bottom: 8px;
}

.block h2 { font-size: 28px; margin-bottom: 16px; }
.intro { max-width: 820px; color: var(--muted); margin-bottom: 28px; }

.quad {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.tile {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 22px 22px 20px;
}

.tile h3 { font-size: 19px; margin: 12px 0 10px; }
.icon-sq {
  width: 40px;
  height: 40px;
  color: var(--navy);
}

.num-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}
.num-title span {
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 22px;
}

.plat-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.plat {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 20px 16px;
  text-align: left;
}
.plat h3 { font-size: 17px; margin-bottom: 8px; }
.plat p { font-size: 14px; color: var(--muted); }

.deep-item {
  border-left: 3px solid var(--gold);
  padding: 6px 0 8px 20px;
  margin-bottom: 28px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 20px 0 24px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 18px 14px;
  text-align: center;
}
.stat b {
  display: block;
  font-size: 28px;
  color: var(--navy);
  font-family: Georgia, serif;
}
.stat span { font-size: 13px; color: var(--muted); }

.voice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
}
.voice {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 20px;
}
.voice strong { display: block; margin-top: 12px; color: var(--navy); font-size: 14px; }

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  margin: 16px 0 22px;
  font-size: 14px;
}
.compare-table th,
.compare-table td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
}
.compare-table th { background: var(--gold-soft); color: var(--navy-deep); }

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 16px 0 16px 16px;
  border-left: 3px solid var(--gold);
  margin-bottom: 12px;
  background: var(--card);
  padding-right: 18px;
}
.faq-item h3 { font-size: 17px; margin-bottom: 8px; }

.site-foot {
  background: var(--navy-deep);
  color: #c5cedb;
  padding: 36px 0 28px;
  font-size: 13px;
  line-height: 1.8;
}
.site-foot strong { color: var(--gold); }
.site-foot a { color: #e8edf5; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 900px) {
  .hero-grid,
  .quad,
  .plat-list,
  .stat-row,
  .voice-grid {
    grid-template-columns: 1fr;
  }
  .site-head .shell { flex-direction: column; padding: 14px 24px; gap: 10px; }
  .hero-copy h1 { font-size: 28px; }
}