:root {
  --navy: #0b1f3a;
  --navy-2: #102a4c;
  --blue: #0d6efd;
  --cyan: #1fb6c9;
  --teal: #14b8a6;
  --orange: #ff7a18;
  --ink: #1f2d3d;
  --muted: #5b6b7e;
  --line: #e6ebf1;
  --bg: #ffffff;
  --bg-alt: #f5f8fc;
  --shadow: 0 18px 40px -20px rgba(11, 31, 58, .25);
  --radius: 16px;
  --maxw: 1180px;

  /* ===== 字号阶梯 Type Scale（统一收口） ===== */
  --fs-xs: 12px;                              /* 元信息 / 脚注 / 标签 */
  --fs-sm: 14px;                              /* 次级文字 / 导航 / 表单 */
  --fs-base: 16px;                            /* 正文基准 */
  --fs-md: 18px;                              /* 大正文 / 卡片标题 */
  --fs-lg: 20px;                             /* 区块小标题 */
  --fs-xl: 24px;                              /* 强调数字 */
  --fs-2xl: 30px;                            /* 装饰序号 */
  --fs-display: 42px;                         /* 数据条数字 / 卡片水印 */
  --fs-h2: clamp(26px, 3.4vw, 38px);          /* 区块标题 */
  --fs-h1: clamp(32px, 4.6vw, 52px);          /* 英雄区主标题 */
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
  font-size: var(--fs-base);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: var(--fs-sm);
  cursor: pointer; border: none; transition: transform .2s, box-shadow .2s, background .2s;
  white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: var(--fs-sm); }
.btn-primary { background: linear-gradient(120deg, var(--blue), var(--cyan)); color: #fff; box-shadow: 0 10px 24px -10px rgba(13,110,253,.6); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -12px rgba(13,110,253,.7); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.35); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,.2); transform: translateY(-2px); }
.full { width: 100%; }

/* ===== 顶部导航 ===== */
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; font-size: var(--fs-lg); box-shadow: var(--shadow);
}
.logo-text { font-size: var(--fs-lg); letter-spacing: .5px; display: flex; flex-direction: column; line-height: 1.05; }
.logo-text i { font-style: normal; font-size: var(--fs-xs); font-weight: 500; color: var(--muted); letter-spacing: 2px; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { font-size: var(--fs-sm); color: var(--ink); font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--blue); }
.nav-cta { color: #fff !important; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.menu-toggle span { width: 24px; height: 2.5px; background: var(--ink); border-radius: 2px; transition: .3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ===== 英雄区 ===== */
.hero { position: relative; background: var(--navy); color: #fff; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(31,182,201,.35), transparent 60%),
    radial-gradient(700px 500px at 0% 110%, rgba(13,110,253,.35), transparent 60%),
    linear-gradient(160deg, var(--navy), var(--navy-2));
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0; opacity: .12;
  background-image: linear-gradient(rgba(255,255,255,.5) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.5) 1px, transparent 1px);
  background-size: 48px 48px; mask-image: radial-gradient(circle at 70% 30%, #000, transparent 75%);
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; padding: 92px 24px 120px; }
.hero-copy { max-width: 560px; }
.badge { display: inline-block; padding: 7px 14px; border-radius: 999px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2); font-size: var(--fs-xs); margin-bottom: 22px; }
.hero h1 { font-size: var(--fs-h1); line-height: 1.12; font-weight: 800; letter-spacing: -.5px; }
.grad { background: linear-gradient(120deg, #6ee7f5, #7aa8ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { margin: 22px 0 30px; font-size: var(--fs-md); color: rgba(255,255,255,.82); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-tags { list-style: none; display: flex; gap: 20px; margin-top: 30px; flex-wrap: wrap; color: rgba(255,255,255,.85); font-size: var(--fs-sm); }
.hero-tags li { white-space: nowrap; }

.hero-wave { position: absolute; bottom: -1px; left: 0; width: 100%; line-height: 0; }
.hero-wave svg { width: 100%; height: 110px; }
.hero-wave path { fill: var(--bg); }

/* 查件卡片 */
.track-card {
  background: #fff; color: var(--ink); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
  position: relative; z-index: 2;
}
.track-card h3 { font-size: var(--fs-md); margin-bottom: 16px; }
.track-input { display: flex; gap: 10px; }
.track-input input { flex: 1; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: var(--fs-sm); outline: none; transition: border .2s; }
.track-input input:focus { border-color: var(--blue); }
.track-hint { font-size: var(--fs-xs); color: var(--muted); margin-top: 12px; }
.track-result { margin-top: 8px; border-top: 1px dashed var(--line); padding-top: 16px; }
.track-status { display: flex; align-items: center; gap: 8px; font-size: var(--fs-base); }
.track-status .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px rgba(20,184,166,.2); animation: pulse 1.6s infinite; }
.track-status span:last-child { margin-left: auto; color: var(--muted); font-size: var(--fs-sm); }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 4px rgba(20,184,166,.25);} 50% { box-shadow: 0 0 0 8px rgba(20,184,166,0);} }
.track-timeline { list-style: none; margin-top: 14px; border-left: 2px solid var(--line); padding-left: 16px; }
.track-timeline li { position: relative; padding: 0 0 14px; font-size: var(--fs-sm); color: var(--muted); }
.track-timeline li:last-child { padding-bottom: 0; }
.track-timeline li::before { content: ""; position: absolute; left: -22px; top: 5px; width: 10px; height: 10px; border-radius: 50%; background: #fff; border: 2px solid var(--line); }
.track-timeline li.done::before { background: var(--teal); border-color: var(--teal); }
.track-timeline strong { display: block; color: var(--ink); }

/* ===== Hero 车辆展示图 ===== */
.hero-truck {
  background: #fff; border-radius: var(--radius);
  padding: 8px; box-shadow: var(--shadow);
  position: relative; z-index: 2;
}
.hero-truck img {
  display: block; width: 100%; height: auto;
  border-radius: calc(var(--radius) - 4px);
}

/* ===== 数据条 ===== */
.stats { background: var(--bg); margin-top: -1px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 44px 24px; }
.stat { text-align: center; }
.stat .num { font-size: var(--fs-display); font-weight: 800; background: linear-gradient(120deg, var(--blue), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .label { color: var(--muted); font-size: var(--fs-sm); margin-top: 4px; }

/* ===== 通用 section ===== */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 660px; margin: 0 auto 48px; }
.eyebrow { display: inline-block; font-size: var(--fs-xs); font-weight: 700; letter-spacing: 2px; color: var(--blue); text-transform: uppercase; margin-bottom: 12px; }
.section-head h2 { font-size: var(--fs-h2); font-weight: 800; letter-spacing: -.5px; }
.section-head p { color: var(--muted); margin-top: 14px; font-size: var(--fs-base); }

/* ===== 核心业务卡片（2×2 专业版）===== */
.cards { display: grid; grid-template-columns: repeat(2, 1fr) !important; gap: 24px; }
.card {
  background: #fff; border: none; border-radius: var(--radius);
  padding: 32px 32px 28px; position: relative;
  transition: transform .25s, box-shadow .25s;
  box-shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px;
}
.card:nth-child(1)::before { background: linear-gradient(180deg, #0d6efd, #1fb6c9); }
.card:nth-child(2)::before { background: linear-gradient(180deg, #f97316, #eab308); }
.card:nth-child(3)::before { background: linear-gradient(180deg, #8b5cf6, #ec4899); }
.card:nth-child(4)::before { background: linear-gradient(180deg, #10b981, #06b6d4); }

.card:hover { transform: translateY(-5px); box-shadow: 0 8px 30px rgba(0,0,0,.1); }
.card-num {
  font-size: var(--fs-display); font-weight: 900; line-height: 1;
  color: rgba(0,0,0,.05); margin-bottom: 8px;
}
.card-ico { display: none; }
.card h3 { font-size: var(--fs-lg); font-weight: 700; margin-bottom: 10px; letter-spacing: -.3px; }
.card p { color: var(--muted); font-size: var(--fs-sm); line-height: 1.7; }

/* 优势 */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.why-item { background: #fff; border-radius: var(--radius); padding: 26px; border-top: 3px solid transparent; border-image: linear-gradient(120deg, var(--blue), var(--cyan)) 1; box-shadow: 0 6px 20px -14px rgba(11,31,58,.25); }
.why-num { font-size: var(--fs-2xl); font-weight: 800; color: var(--line); }
.why-item h3 { font-size: var(--fs-md); margin: 6px 0 8px; }
.why-item p { color: var(--muted); font-size: var(--fs-sm); }

/* 网络 */
.network { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.network-copy h2 { font-size: var(--fs-h2); font-weight: 800; margin: 10px 0 16px; }
.network-copy p { color: var(--muted); font-size: var(--fs-base); }
.network-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 24px 0; }
.network-list li { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; font-size: var(--fs-sm); color: var(--muted); }
.network-list strong { display: block; font-size: var(--fs-xl); color: var(--blue); font-weight: 800; }
.network-map { background: var(--navy); border-radius: 20px; padding: 20px; box-shadow: var(--shadow); overflow: hidden; }
.map-svg { width: 100%; height: auto; display: block; }
.route-line { stroke-dasharray: 6 8; animation: routeFlow 2s linear infinite; }
@keyframes routeFlow { to { stroke-dashoffset: -28; } }
.hub-label { fill: #ffd54a; font-size: var(--fs-base); font-weight: 700; text-anchor: middle; }
.hub-sub { fill: rgba(255,213,74,.65); font-size: var(--fs-xs); font-weight: 500; text-anchor: middle; letter-spacing: 2px; }
.city-label { fill: rgba(110,231,245,.9); font-size: var(--fs-sm); font-weight: 600; text-anchor: middle; }
.city-label-sm { fill: rgba(147,197,253,.75); font-size: var(--fs-xs); font-weight: 500; text-anchor: middle; }
.legend-text { fill: rgba(255,255,255,.55); font-size: 11px; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: s; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.step-no { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); margin-bottom: 14px; }
.step h3 { font-size: var(--fs-md); margin-bottom: 6px; }
.step p { color: var(--muted); font-size: var(--fs-sm); }

/* 评价 */
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.quote { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; position: relative; }
.quote::before { content: "\201C"; position: absolute; top: 8px; right: 18px; font-size: 60px; color: var(--line); font-family: Georgia, serif; }
.quote blockquote { font-size: var(--fs-base); color: var(--ink); margin-bottom: 18px; }
.quote figcaption { display: flex; align-items: center; gap: 10px; font-size: var(--fs-sm); color: var(--muted); }
.avatar { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); font-weight: 700; }

/* 询价 */
.quote-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.quote-copy h2 { font-size: var(--fs-h2); font-weight: 800; margin: 10px 0 14px; }
.quote-copy p { color: var(--muted); font-size: var(--fs-base); }
.quote-points { list-style: none; margin-top: 22px; display: grid; gap: 12px; }
.quote-points li { font-size: var(--fs-base); }
.quote-form { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 28px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: var(--fs-sm); font-weight: 600; color: var(--ink); }
.field input, .field select, .field textarea { padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px; font-size: var(--fs-sm); font-family: inherit; outline: none; transition: border .2s; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); }
.form-msg { grid-column: 1 / -1; font-size: var(--fs-sm); color: var(--teal); font-weight: 600; }

/* 页脚 */
.footer { background: var(--navy); color: rgba(255,255,255,.78); padding-top: 60px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 32px; padding-bottom: 40px; }
.footer .logo-text { color: #fff; }
.footer-brand p { margin: 14px 0 18px; font-size: var(--fs-sm); max-width: 280px; }
.socials { display: flex; gap: 10px; }
.socials a { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: rgba(255,255,255,.1); font-size: var(--fs-lg); transition: background .2s; }
.socials a:hover { background: rgba(255,255,255,.22); }
.footer-col h4 { color: #fff; font-size: var(--fs-base); margin-bottom: 14px; }
.footer-col a, .footer-col p { display: block; font-size: var(--fs-sm); margin-bottom: 10px; transition: color .2s; }
.footer-col a:hover { color: #6ee7f5; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; font-size: var(--fs-xs); color: rgba(255,255,255,.55); }

/* 返回顶部 */
.to-top { position: fixed; right: 22px; bottom: 22px; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; font-size: var(--fs-lg); box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s; z-index: 40; }
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { transform: translateY(-3px); }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .cards, .why-grid, .steps, .quotes { grid-template-columns: repeat(2, 1fr) !important; }
  .network, .quote-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .container { padding: 0 18px; }
  .nav-links {
    position: fixed; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; padding: 12px 24px 24px; border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
    transform: translateY(-120%); transition: transform .3s; z-index: 49;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav-cta { margin-top: 12px; text-align: center; }
  .menu-toggle { display: flex; }
  .hero-inner { padding: 56px 18px 84px; gap: 32px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-tags { gap: 12px 18px; font-size: var(--fs-xs); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); padding: 32px 18px; gap: 24px 12px; }
  .cards, .why-grid, .steps, .quotes { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .network-list { grid-template-columns: 1fr; }
  .quote-form { grid-template-columns: 1fr; padding: 22px; gap: 14px; }
  .section { padding: 56px 0; }
  .section-head { margin: 0 auto 36px; }
  .section-head h2 { font-size: clamp(24px, 6vw, 32px); }
  .card { padding: 26px 22px 24px; }
  .why-item, .step, .quote { padding: 22px; }
  .footer-bottom { text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .logo-text i { display: none; }
  .hero h1 { font-size: clamp(28px, 8.5vw, 36px); }
  .lead { font-size: var(--fs-base); }
  .hero-inner { padding: 44px 16px 72px; }
  .stats-grid { gap: 20px 8px; }
  .stat .num { font-size: 34px; }
  .stat .label { font-size: var(--fs-xs); }
  .footer-grid { grid-template-columns: 1fr; }
  .quote-form { padding: 18px; }
  .field input, .field select, .field textarea { padding: 13px 13px; font-size: 16px; }
  .to-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
  .section { padding: 48px 0; }
}