/* 单文件样式，无外部依赖（不引 CDN / 外部字体，避免大陆访问与备案审核问题） */
:root {
  --ink: #12151a;
  --muted: #5b6472;
  --line: #e3e6ea;
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --brand: #14539a;
  --brand-ink: #ffffff;
  --radius: 10px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }
img { max-width: 100%; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--ink); font-weight: 600;
}
.brand-logo {
  display: block; width: 46px; height: 46px;
  object-fit: contain; flex: 0 0 auto;
}
.nav { display: flex; gap: 22px; }
.nav a {
  color: var(--muted); text-decoration: none; font-size: 15px;
  padding: 4px 0; border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--brand); border-bottom-color: var(--brand); }

/* ---------- Hero ---------- */
.hero {
  padding: 88px 0 76px;
  background:
    radial-gradient(900px 340px at 50% -10%, #eaf1fa 0%, transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  margin: 0 0 14px; color: var(--brand);
  font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
}
.hero h1 { margin: 0 0 18px; font-size: clamp(30px, 5vw, 46px); line-height: 1.25; letter-spacing: -.01em; }
.lede { margin: 0 0 30px; max-width: 620px; color: var(--muted); font-size: 17px; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 8px;
  font-size: 15px; text-decoration: none; transition: .18s ease;
  border: 1px solid transparent;
}
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { background: #0f4378; }
.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- 通用区块 ---------- */
.section { padding: 68px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 {
  margin: 0 0 24px; font-size: 26px; letter-spacing: -.01em;
  padding-bottom: 12px; border-bottom: 1px solid var(--line);
}
.section p { max-width: 760px; color: #333a44; }

/* ---------- 事实列表 ---------- */
.facts {
  list-style: none; margin: 30px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.facts li { background: var(--bg); padding: 18px 20px; }
.facts strong { display: block; font-size: 13px; color: var(--muted); font-weight: 500; margin-bottom: 4px; }

/* ---------- 卡片 ---------- */
.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px;
  margin-top: 8px;
}
.card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 22px;
  transition: .18s ease;
}
.card:hover { border-color: #c9d2dd; transform: translateY(-2px); }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- 联系方式 ---------- */
.contact { list-style: none; margin: 8px 0 0; padding: 0; }
.contact li { padding: 12px 0; border-bottom: 1px solid var(--line); display: flex; gap: 18px; }
.contact strong { flex: 0 0 88px; color: var(--muted); font-weight: 500; font-size: 15px; }
.contact a { color: var(--brand); text-decoration: none; }
.contact a:hover { text-decoration: underline; }
.hint { margin-top: 22px; font-size: 13px; color: #8a929e; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line); background: var(--bg-alt);
  padding: 30px 0; font-size: 13px; color: var(--muted);
}
.site-footer p { margin: 0 0 6px; }
.beian { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.beian a { color: var(--muted); text-decoration: none; }
.beian a:hover { color: var(--brand); }
.sep { color: #c3c9d2; }

/* ---------- 覆盖线路：海报版式 ---------- */
/* 必须带 .coverage-billboard 前缀提高优先级，否则会被 .section h2 / .section p 压掉。 */
.coverage-billboard {
  background:
    repeating-linear-gradient(-55deg, rgba(255,255,255,.022) 0 1px, transparent 1px 10px),
    radial-gradient(1100px 520px at 78% 42%, #16436f 0%, #0b2545 62%, #081d38 100%);
  padding: 92px 0;
  overflow: hidden;
}
.coverage-billboard .wrap { max-width: 1180px; }
.coverage-billboard .billboard {
  display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr);
  gap: 48px; align-items: center;
}

.coverage-billboard .bb-eyebrow {
  display: inline-block; margin: 0 0 26px; padding: 7px 16px; max-width: none;
  border: 1px solid rgba(255,255,255,.22); border-radius: 999px;
  color: #8fc3ec; font-size: 12.5px; letter-spacing: .22em;
}

.coverage-billboard .bb-head { display: flex; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.coverage-billboard .bb-title { margin: 0 0 24px; padding: 0; border: 0; line-height: 1; font-weight: 900; }
.coverage-billboard .bb-l1 {
  display: block; color: #fff;
  font-size: clamp(46px, 6.9vw, 80px); letter-spacing: .01em; font-weight: 900;
  text-shadow: 0 4px 24px rgba(0,0,0,.45);
}
.coverage-billboard .bb-l2 {
  display: block; margin-top: 8px;
  font-size: clamp(46px, 6.9vw, 80px); letter-spacing: .06em; font-weight: 900;
  background: linear-gradient(180deg, #ffe27a 0%, #ffc94d 48%, #f59f24 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 5px 16px rgba(0,0,0,.5));
}
.coverage-billboard .bb-stamp {
  display: inline-block; margin: 0 0 30px 4px; padding: 7px 13px 8px;
  border: 2px solid #ff6b6b; border-radius: 8px;
  color: #ff8585; font-size: 15px; font-weight: 700; letter-spacing: .14em;
  transform: rotate(-5deg); white-space: nowrap;
}

.coverage-billboard .bb-sub {
  margin: 0 0 32px; max-width: none;
  color: #a9c4de; font-size: clamp(14px, 1.6vw, 17px); letter-spacing: .04em;
}

.coverage-billboard .bb-stats {
  list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px; margin: 0 0 24px; padding: 0;
}
.coverage-billboard .bb-stats li {
  display: flex; flex-direction: column; gap: 5px;
  padding: 16px 18px 15px;
  background: #fff; border-radius: 14px;
  box-shadow: 0 12px 26px rgba(0, 0, 0, .22);
}
.coverage-billboard .bb-stats strong {
  font-size: clamp(30px, 3.4vw, 42px); line-height: 1; font-weight: 800;
  color: #0f4c86; font-variant-numeric: tabular-nums;
}
.coverage-billboard .bb-stats span { font-size: 12.5px; color: #61708a; letter-spacing: .01em; }

.coverage-billboard .bb-cities {
  list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 10px; margin: 0 0 34px; padding: 0; max-width: none;
}
.coverage-billboard .bb-cities li {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 6px 13px;
  background: linear-gradient(180deg, rgba(255,255,255,.13) 0%, rgba(255,255,255,.05) 100%);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 10px; font-weight: 700;
  font-size: clamp(15px, 1.7vw, 19px); color: #eef6ff; letter-spacing: .1em;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.14);
  transition: .16s ease;
}
.coverage-billboard .bb-cities li::before {
  content: ""; flex: 0 0 auto;
  width: 6px; height: 6px; border-radius: 50%;
  background: #ff5b5b; box-shadow: 0 0 0 3px rgba(255,91,91,.18);
}
.coverage-billboard .bb-cities li:hover {
  background: linear-gradient(180deg, rgba(255,255,255,.2) 0%, rgba(255,255,255,.08) 100%);
  border-color: rgba(255,214,102,.45); transform: translateY(-1px);
}

.coverage-billboard .btn-billboard {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 15px 30px; border-radius: 10px;
  background: linear-gradient(180deg, #ffdf7e 0%, #ffc93f 100%);
  color: #10243d; font-weight: 700; font-size: 16px; letter-spacing: .02em;
  text-decoration: none; box-shadow: 0 8px 22px rgba(255,201,63,.25);
  transition: .18s ease;
}
.coverage-billboard .btn-billboard:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(255,201,63,.34); }

.coverage-billboard .bb-map { margin: 0; }
.coverage-billboard .bb-map img {
  display: block; width: 100%; height: auto; max-width: 620px; margin: 0 auto;
  filter: drop-shadow(0 22px 44px rgba(0,0,0,.42));
}
.coverage-billboard .bb-map figcaption {
  margin-top: 14px; text-align: center; font-size: 12.5px; color: #7f9bb6; letter-spacing: .06em;
}

@media (max-width: 980px) {
  .coverage-billboard { padding: 64px 0; }
  .coverage-billboard .billboard { grid-template-columns: 1fr; gap: 44px; }
  .coverage-billboard .bb-contact { margin-top: 48px; }
}

@media (max-width: 560px) {
  .coverage-billboard .bb-stats { grid-template-columns: 1fr; }
  .coverage-billboard .bb-stats li {
    flex-direction: row; align-items: baseline; gap: 10px; padding: 13px 16px;
  }
}

/* ---------- 联系区块（并入地图板块，小字展示） ---------- */
.coverage-billboard .bb-contact {
  margin-top: 68px; padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.14);
}
.coverage-billboard .bb-contact-title {
  margin: 0 0 16px; padding: 0; border: 0;
  color: #ffcf5c; font-size: 12.5px; font-weight: 700; letter-spacing: .22em;
}
.coverage-billboard .bb-line {
  margin: 0 0 9px; max-width: none;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px;
  color: #dce9f7; font-size: 14px;
}
.coverage-billboard .bb-line .k { min-width: 62px; color: #7f9bb6; font-size: 13px; }
.coverage-billboard .bb-tels { gap: 8px 28px; }
.coverage-billboard .bb-tels .tel { color: #cfe0f2; font-size: 14px; }
.coverage-billboard .bb-tels b { margin-right: 7px; font-weight: 500; color: #93b0cc; }
.coverage-billboard .bb-tels a {
  color: #fff; text-decoration: none; font-variant-numeric: tabular-nums;
}
.coverage-billboard .bb-tels a:hover { color: #ffcf5c; }

/* ---------- 移动端 ---------- */
/* 顶部导航：390px 宽度下 brand + 4 个链接放不进一行，允许换行 */
@media (max-width: 720px) {
  .site-header { position: static; }
  .site-header .wrap {
    height: auto; flex-wrap: wrap; row-gap: 6px;
    padding-top: 12px; padding-bottom: 12px;
  }
  .nav { gap: 14px 18px; flex-wrap: wrap; }
  .nav a { font-size: 14px; }
  .brand-name { font-size: 15px; }
  .coverage-billboard .bb-cities { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .nav { gap: 14px; font-size: 14px; }
  .nav a { font-size: 14px; }
  .hero { padding: 60px 0 52px; }
  .section { padding: 52px 0; }
}