/* ===== 品牌变量 ===== */
:root {
  --navy: #0a2540;        /* 深蓝主色 */
  --navy-light: #133b5c;
  --orange: #f5821f;      /* 橙色（取自Logo） */
  --orange-dark: #e06d0a;
  --gray-bg: #f5f7fa;
  --text: #1a1a1a;
  --text-light: #6b7280;
  --white: #ffffff;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(10, 37, 64, 0.08);
  --max-width: 1200px;
}

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

body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--white);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

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

/* ===== 顶部栏 ===== */
.topbar {
  background: var(--navy);
  color: rgba(255,255,255,0.8);
  font-size: 13px;
  padding: 8px 0;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar a { color: rgba(255,255,255,0.8); margin-left: 18px; }
.topbar a:hover { color: var(--orange); }

/* ===== 导航 ===== */
header {
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo img { height: 52px; width: auto; }
.nav-links { display: flex; gap: 34px; align-items: center; }
.nav-links a {
  font-weight: 500;
  font-size: 15px;
  color: var(--navy);
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--orange); }

.lang-switch {
  background: var(--gray-bg);
  border: none;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
  transition: all .2s;
}
.lang-switch:hover { background: var(--orange); color: #fff; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: #fff;
  padding: 90px 0 100px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  right: -100px; top: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(245,130,31,0.25), transparent 70%);
  border-radius: 50%;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: 46px;
  line-height: 1.2;
  font-weight: 800;
  margin-bottom: 22px;
}
.hero h1 span { color: var(--orange); }
.hero p {
  font-size: 17px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 34px;
  max-width: 520px;
}
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  transition: all .25s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--orange);
  color: #fff;
}
.btn-primary:hover { background: var(--orange-dark); transform: translateY(-2px); }
.btn-outline {
  border: 2px solid rgba(255,255,255,0.4);
  color: #fff;
  margin-left: 14px;
}
.btn-outline:hover { border-color: var(--orange); color: var(--orange); }

/* Hero 追踪小框 */
.hero-track {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  padding: 30px;
}
.hero-track h3 { font-size: 18px; margin-bottom: 16px; }
.hero-track input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 8px;
  border: none;
  font-size: 15px;
  margin-bottom: 12px;
}
.hero-track button {
  width: 100%;
  padding: 14px;
  background: var(--orange);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.hero-track button:hover { background: var(--orange-dark); }

/* ===== 数据条 ===== */
.stats {
  background: var(--orange);
  color: #fff;
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-num { font-size: 38px; font-weight: 800; }
.stat-label { font-size: 14px; opacity: 0.9; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-gray { background: var(--gray-bg); }
.section-title {
  text-align: center;
  margin-bottom: 56px;
}
.section-title h2 {
  font-size: 34px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 12px;
}
.section-title p { color: var(--text-light); font-size: 16px; }

/* ===== 服务卡片 ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  transition: all .3s;
  border-top: 4px solid transparent;
}
.service-card:hover {
  transform: translateY(-6px);
  border-top-color: var(--orange);
}
.service-icon {
  width: 56px; height: 56px;
  background: rgba(245,130,31,0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}
.service-card h3 {
  font-size: 19px;
  color: var(--navy);
  margin-bottom: 10px;
}
.service-card p { color: var(--text-light); font-size: 14.5px; }

/* ===== 优势 ===== */
.advantages {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.adv-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.adv-num {
  flex-shrink: 0;
  width: 44px; height: 44px;
  background: var(--navy);
  color: var(--orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 17px;
}
.adv-item h4 { color: var(--navy); margin-bottom: 6px; font-size: 17px; }
.adv-item p { color: var(--text-light); font-size: 14.5px; }

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  color: #fff;
  text-align: center;
  padding: 70px 0;
}
.cta h2 { font-size: 32px; margin-bottom: 16px; }
.cta p { color: rgba(255,255,255,0.8); margin-bottom: 30px; }

/* ===== 页脚 ===== */
footer {
  background: #061a2e;
  color: rgba(255,255,255,0.7);
  padding: 60px 0 24px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-grid h4 { color: #fff; margin-bottom: 18px; font-size: 16px; }
.footer-grid a { display: block; margin-bottom: 10px; color: rgba(255,255,255,0.7); }
.footer-grid a:hover { color: var(--orange); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 22px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .services-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
}