:root {
  --brand: #0e5aa7;
  --brand-dark: #0a4480;
  --brand-soft: #e8f1fa;
  --accent: #1f8fd6;
  --ink: #1d2733;
  --body: #44505d;
  --muted: #74808d;
  --line: #e3e8ee;
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --dark: #0c2440;
  --radius: 6px;
  --container: 1160px;
  --shadow: 0 1px 3px rgba(16, 38, 64, .06), 0 6px 20px rgba(16, 38, 64, .05);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--body);
  background: var(--bg);
  line-height: 1.65;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }

h1, h2, h3 { color: var(--ink); margin: 0; line-height: 1.3; }

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

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo { display: inline-flex; align-items: center; gap: 10px; }
.nav-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .5px;
  border-radius: var(--radius);
}
.nav-logo-text { color: var(--ink); font-weight: 600; font-size: 17px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: var(--body);
  font-size: 15px;
  padding: 6px 0;
  position: relative;
}
.nav-links a:hover { color: var(--brand); }
.nav-links a.active { color: var(--brand); font-weight: 600; }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px; height: 40px;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .55); }
.btn-ghost:hover { background: rgba(255, 255, 255, .12); }
.btn-light { background: #fff; color: var(--brand); }

/* 首页 Hero */
.hero {
  background: linear-gradient(160deg, #0c2f57 0%, #0e5aa7 100%);
  color: #fff;
  padding: 92px 0 84px;
}
.hero-inner { text-align: center; max-width: 820px; margin: 0 auto; }
.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  color: #a9d2f4;
  background: rgba(255, 255, 255, .08);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 22px;
}
.hero-title { color: #fff; font-size: 40px; font-weight: 700; margin-bottom: 18px; }
.hero-sub { color: #d6e4f2; font-size: 18px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 通用区块 */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.section-title { font-size: 28px; font-weight: 700; }
.section-sub { color: var(--muted); margin-top: 12px; font-size: 16px; }
.section-more { text-align: center; margin-top: 36px; }
.section-more a { font-weight: 600; }

/* 统计数据 */
.stats-section { padding: 56px 0; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; }
.stat-value { font-size: 38px; font-weight: 700; color: var(--brand); line-height: 1.1; }
.stat-label { color: var(--muted); margin-top: 8px; font-size: 15px; }

/* 卡片网格 */
.grid { display: grid; gap: 24px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(16, 38, 64, .1); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.ico { width: 28px; height: 28px; }
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.card-desc { color: var(--body); font-size: 15px; }
.card-detail { padding: 32px 28px; }
.card-points { list-style: none; margin: 18px 0 0; padding: 0; }
.card-points li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: var(--body);
  font-size: 15px;
}
.card-points li::before {
  content: "";
  position: absolute;
  left: 2px; top: 9px;
  width: 9px; height: 5px;
  border-left: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  transform: rotate(-45deg);
}

/* 案例卡片 */
.case-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.case-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 3px 12px;
  border-radius: 14px;
  margin-bottom: 14px;
}
.case-title { font-size: 19px; font-weight: 600; margin-bottom: 8px; }
.case-scale { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.case-result { color: var(--body); font-size: 15px; margin: 0; }

/* 行动号召 */
.cta { background: var(--dark); color: #fff; padding: 64px 0; }
.cta-inner { text-align: center; max-width: 680px; margin: 0 auto; }
.cta-title { color: #fff; font-size: 26px; font-weight: 700; }
.cta-sub { color: #b7c6d8; margin: 14px 0 28px; font-size: 16px; }

/* 二级页头 */
.page-hero { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 56px 0; }
.page-title { font-size: 32px; font-weight: 700; }
.page-sub { color: var(--muted); margin-top: 12px; font-size: 16px; }

/* 关于我们 */
.about-grid { display: grid; grid-template-columns: 1.7fr 1fr; gap: 40px; align-items: start; }
.about-main .section-title { margin-bottom: 16px; }
.about-main .section-title + .about-text { margin-bottom: 40px; }
.about-text { color: var(--body); font-size: 16px; }
.timeline { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.timeline-item { position: relative; padding: 0 0 22px 26px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px; top: 6px;
  width: 12px; height: 12px;
  background: var(--brand);
  border-radius: 50%;
  border: 2px solid #fff;
}
.timeline-year { display: block; font-weight: 700; color: var(--brand); }
.timeline-event { color: var(--body); }
.about-contact {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.about-contact-title { font-size: 18px; font-weight: 600; margin-bottom: 18px; }
.contact-row { padding: 10px 0; border-bottom: 1px dashed var(--line); font-size: 15px; color: var(--body); }
.contact-row:last-child { border-bottom: none; }
.contact-label { display: block; color: var(--muted); font-size: 13px; margin-bottom: 2px; }

/* 页脚 */
.site-footer { background: var(--dark); color: #c4d2e0; margin-top: 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr;
  gap: 40px;
  padding: 52px 24px 36px;
}
.footer-name { color: #fff; font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.footer-intro { color: #93a6ba; font-size: 14.5px; max-width: 460px; margin: 0; }
.footer-contact-title { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 14px; }
.footer-contact div { font-size: 14.5px; margin-bottom: 8px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); }
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 24px;
  font-size: 13.5px;
  color: #8195aa;
}
.footer-beian { color: #8195aa; }
.footer-beian:hover { color: #fff; }

/* 响应式 */
@media (max-width: 920px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 33px; }
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 8px 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 24px; }
  .nav-links a.active::after { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
  .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  .hero { padding: 68px 0 60px; }
  .hero-title { font-size: 28px; }
  .hero-sub { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}