* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: #2c3e50;
  line-height: 1.7;
  background: #fff;
}
a { color: #409EFF; text-decoration: none; transition: all 0.3s; }
a:hover { color: #1E5A8A; }
img { max-width: 100%; display: block; }

/* ============ 导航 ============ */
.nav {
  background: #fff;
  padding: 18px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-logo { font-size: 20px; font-weight: 800; color: #1E5A8A; letter-spacing: 0.5px; }
.nav-logo span { color: #409EFF; }
.nav-right { display: flex; align-items: center; gap: 30px; }
.nav-menu { display: flex; align-items: center; gap: 32px; }
.nav-menu a { color: #4a5568; font-size: 15px; font-weight: 500; }
.nav-menu a:hover { color: #409EFF; }
.nav-menu a.active { color: #409EFF; }

.nav-lang {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #a0aec0;
}
.nav-lang a { color: #4a5568; font-weight: 600; }
.nav-lang a.active { color: #409EFF; }
.nav-lang a:hover { color: #409EFF; }

.nav-login {
  color: #718096 !important;
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
}
.nav-login:hover { color: #409EFF !important; border-color: #409EFF; }

/* ============ Hero ============ */
.hero {
  background: linear-gradient(135deg, #1E5A8A 0%, #409EFF 100%);
  color: #fff;
  padding: 120px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.hero h1 { font-size: 44px; margin-bottom: 20px; font-weight: 800; letter-spacing: 1px; position: relative; }
.hero p { font-size: 18px; opacity: 0.95; max-width: 780px; margin: 0 auto 40px; position: relative; }
.hero-btns { position: relative; }
.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 15px 42px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  margin: 0 8px;
}
.btn-primary { background: #fff; color: #1E5A8A !important; }
.btn-primary:hover { background: #f0f7ff; transform: translateY(-3px); box-shadow: 0 12px 30px rgba(0,0,0,0.15); }
.btn-secondary { background: transparent; color: #fff !important; border: 2px solid rgba(255,255,255,0.6); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); border-color: #fff; }

/* ============ 区块 ============ */
.container { max-width: 1200px; margin: 0 auto; padding: 90px 24px; }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title h2 { font-size: 34px; color: #1E5A8A; margin-bottom: 15px; font-weight: 800; }
.section-title p { color: #718096; font-size: 17px; }

/* ============ 服务卡片 ============ */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }
.service-card {
  background: #fff;
  border: 1px solid #e8eef5;
  border-radius: 14px;
  padding: 40px 30px;
  text-align: center;
  transition: all 0.35s;
}
.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 50px rgba(64,158,255,0.15);
  border-color: #409EFF;
}
.service-icon { font-size: 52px; margin-bottom: 20px; }
.service-card h3 { color: #1E5A8A; font-size: 21px; margin-bottom: 12px; font-weight: 700; }
.service-card p { color: #718096; font-size: 15px; line-height: 1.8; }

/* ============ 数据统计 ============ */
.stats { background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%); padding: 80px 24px; }
.stats-grid { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; text-align: center; }
.stat-num { font-size: 46px; font-weight: 800; background: linear-gradient(135deg, #1E5A8A, #409EFF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { color: #4a5568; margin-top: 10px; font-size: 15px; font-weight: 500; }

/* ============ 图片展示 ============ */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.gallery-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #f0f7ff;
  transition: all 0.35s;
}
.gallery-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 45px rgba(64,158,255,0.25);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.gallery-item:hover img { transform: scale(1.08); }

/* ============ 页面 banner ============ */
.page-banner {
  background: linear-gradient(135deg, #1E5A8A 0%, #409EFF 100%);
  color: #fff;
  padding: 80px 40px;
  text-align: center;
}
.page-banner h1 { font-size: 42px; margin-bottom: 12px; font-weight: 800; }
.page-banner p { font-size: 17px; opacity: 0.9; }

/* ============ 关于 ============ */
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-content h2 { color: #1E5A8A; font-size: 32px; margin-bottom: 24px; font-weight: 800; }
.about-content p { color: #4a5568; margin-bottom: 18px; font-size: 16px; line-height: 1.9; }

/* ============ 服务详情 ============ */
.service-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding: 60px 0; border-bottom: 1px solid #e8eef5; }
.service-detail:last-child { border-bottom: none; }
.service-detail.reverse { direction: rtl; }
.service-detail.reverse > * { direction: ltr; }
.service-detail h2 { color: #1E5A8A; font-size: 30px; margin-bottom: 20px; font-weight: 800; }
.service-detail p { color: #4a5568; margin-bottom: 15px; font-size: 16px; line-height: 1.9; }
.service-detail ul { list-style: none; margin-top: 20px; }
.service-detail ul li { padding: 10px 0 10px 30px; position: relative; color: #4a5568; }
.service-detail ul li::before { content: '✓'; position: absolute; left: 0; color: #409EFF; font-weight: bold; font-size: 18px; }
.service-detail-img { background: linear-gradient(135deg, #f0f7ff, #e6f2ff); border-radius: 16px; height: 320px; display: flex; align-items: center; justify-content: center; font-size: 100px; }

/* ============ 联系 ============ */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.5fr; gap: 60px; }
.contact-info h2 { color: #1E5A8A; font-size: 28px; margin-bottom: 30px; font-weight: 800; }
.contact-item { margin-bottom: 30px; }
.contact-item .label { color: #718096; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.contact-item .value { color: #1E5A8A; font-size: 17px; font-weight: 600; }
.contact-form { background: #f8fbff; padding: 45px; border-radius: 16px; border: 1px solid #e8eef5; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; margin-bottom: 8px; color: #4a5568; font-size: 14px; font-weight: 600; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1.5px solid #e2e8f0;
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: all 0.3s;
  background: #fff;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: #409EFF; box-shadow: 0 0 0 4px rgba(64,158,255,0.1); }
.form-group textarea { resize: vertical; min-height: 130px; }
.btn-submit {
  background: linear-gradient(135deg, #1E5A8A, #409EFF);
  color: #fff;
  border: none;
  padding: 15px 45px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  width: 100%;
}
.btn-submit:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(64,158,255,0.35); }

/* ============ 页脚 ============ */
.footer { background: #1a2332; color: #cbd5e0; padding: 60px 24px 30px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 50px; margin-bottom: 40px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 20px; font-weight: 700; }
.footer p, .footer li { font-size: 14px; line-height: 2; opacity: 0.8; }
.footer ul { list-style: none; }
.footer a { color: #cbd5e0; }
.footer a:hover { color: #409EFF; }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding-top: 30px; border-top: 1px solid #2d3748; text-align: center; font-size: 13px; opacity: 0.6; }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .about-content, .service-detail, .contact-wrap, .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .service-detail.reverse { direction: ltr; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }
  .container { padding: 60px 20px; }
  .nav { padding: 15px 20px; flex-wrap: wrap; gap: 15px; }
  .nav-right { gap: 15px; flex-wrap: wrap; }
  .nav-menu { gap: 18px; }
  .nav-menu a { font-size: 14px; }
  .section-title h2 { font-size: 26px; }
  .btn-primary, .btn-secondary { display: block; margin: 10px auto; }
}

/* ============ Hero 轮播 ============ */
.hero-slider {
  position: relative;
  height: 620px;
  overflow: hidden;
  background: linear-gradient(135deg, #1E5A8A 0%, #409EFF 100%);
}
.hero-slide {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
  z-index: 1;
}
.hero-slide.active { opacity: 1; }
.hero-slide::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(15, 40, 70, 0.55);
}
.hero-content {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  text-align: center;
  z-index: 10;
  width: 90%;
  max-width: 900px;
}
.hero-content h1 {
  font-size: 46px;
  margin-bottom: 20px;
  font-weight: 800;
  letter-spacing: 1px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.hero-content p {
  font-size: 19px;
  margin-bottom: 40px;
  opacity: 0.95;
  text-shadow: 0 2px 10px rgba(0,0,0,0.4);
}
.hero-content .btn-primary,
.hero-content .btn-secondary {
  display: inline-block;
  padding: 15px 42px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  margin: 0 8px;
}
.hero-content .btn-primary { background: #fff; color: #1E5A8A !important; }
.hero-content .btn-primary:hover { background: #f0f7ff; transform: translateY(-3px); box-shadow: 0 12px 30px rgba(0,0,0,0.25); }
.hero-content .btn-secondary { background: transparent; color: #fff !important; border: 2px solid rgba(255,255,255,0.7); }
.hero-content .btn-secondary:hover { background: rgba(255,255,255,0.15); border-color: #fff; }

/* 轮播小圆点 */
.hero-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  gap: 12px;
}
.hero-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.3s;
}
.hero-dot.active { background: #fff; width: 30px; border-radius: 5px; }

@media (max-width: 900px) {
  .hero-slider { height: 480px; }
  .hero-content h1 { font-size: 30px; }
  .hero-content p { font-size: 15px; }
  .hero-content .btn-primary,
  .hero-content .btn-secondary { display: block; margin: 10px auto; width: fit-content; }
}