:root {
  --primary: #1a568e;
  --primary-dark: #0d3b66;
  --accent: #2e7d32;
  --bg-light: #f5f7fa;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --radius: 10px;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --max-width: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg-light);
  padding-bottom: 70px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 800px; }

/* Header */
.site-header {
  background: var(--surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { display: flex; flex-direction: column; color: var(--text); }
.logo strong { font-size: 1.15rem; color: var(--primary); }
.logo span { font-size: 0.75rem; color: var(--muted); }
.main-nav ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; }
.main-nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.main-nav a:hover, .main-nav a.active { color: var(--primary); }
.header-cta {
  background: var(--primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 600;
}
.header-cta:hover { background: var(--primary-dark); text-decoration: none; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); }

/* Hero */
.hero { position: relative; color: #fff; }
.hero-media { width: 100%; max-height: 360px; overflow: hidden; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(13,59,102,0.85) 0%, rgba(13,59,102,0.5) 60%, rgba(13,59,102,0.2) 100%);
}
.hero-content {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  text-align: left;
}
.hero-content h1 { font-size: 2.2rem; margin: 0 0 16px; max-width: 700px; }
.hero-content .lead { font-size: 1.15rem; margin: 0 0 24px; max-width: 680px; opacity: 0.95; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons */
.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: var(--accent); color: #fff; }
.btn-secondary:hover { background: #1b5e20; text-decoration: none; }

/* Sections */
.section { padding: 70px 0; }
.section-alt { background: var(--surface); }
.section-header { text-align: center; margin-bottom: 40px; }
.section-header h2 { font-size: 1.8rem; color: var(--primary-dark); margin: 0 0 10px; }
.section-header p { color: var(--muted); max-width: 700px; margin: 0 auto; }
.page-hero { background: var(--primary-dark); color: #fff; padding: 60px 0; }
.page-hero h1 { font-size: 2rem; margin: 0 0 14px; }
.page-hero .lead { max-width: 760px; margin: 0; opacity: 0.9; }

/* Service grid */
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 26px; }
.service-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-image { display: block; height: 220px; overflow: hidden; }
.card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.service-card:hover .card-image img, .news-card:hover .card-image img { transform: scale(1.04); }
.card-body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { margin: 0 0 10px; font-size: 1.15rem; }
.card-body h3 a { color: var(--primary-dark); }
.card-body p { color: var(--muted); margin: 0 0 16px; flex: 1; }
.read-more { font-weight: 600; color: var(--primary); }

/* News */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 26px; }
.news-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.news-card .card-image { height: 180px; }
.news-card .article-meta { font-size: 0.85rem; color: var(--muted); margin: 0 0 8px; }
.news-card h3 { margin: 0 0 10px; font-size: 1.1rem; line-height: 1.45; }
.news-card h3 a { color: var(--primary-dark); }
.article-header { background: var(--surface); padding: 50px 0 30px; border-bottom: 1px solid var(--border); }
.article-header h1 { max-width: 800px; margin: 0 auto 12px; color: var(--primary-dark); font-size: 1.9rem; padding: 0 20px; }
.article-header .article-meta { max-width: 800px; margin: 0 auto; color: var(--muted); font-size: 0.95rem; padding: 0 20px; }
.article-content { max-width: 800px; margin: 0 auto; padding: 40px 20px; }
.article-content h2 { color: var(--primary-dark); margin-top: 32px; }
.article-content p { margin-bottom: 16px; }
.article-content ul { padding-left: 22px; color: var(--muted); }
.article-content li { margin-bottom: 8px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.feature-item { background: var(--surface); padding: 28px; border-radius: var(--radius); box-shadow: var(--shadow); }
.feature-item h3 { color: var(--primary); margin: 0 0 10px; }
.feature-item p { margin: 0; color: var(--muted); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.step { background: var(--surface); padding: 26px; border-radius: var(--radius); box-shadow: var(--shadow); }
.step-number {
  display: inline-block;
  width: 36px; height: 36px;
  line-height: 36px; text-align: center;
  background: var(--primary); color: #fff;
  border-radius: 50%; font-weight: 700; margin-bottom: 12px;
}
.step h3 { margin: 0 0 8px; color: var(--primary-dark); }
.step p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* City tags */
.city-tags { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 24px; }
.city-tag {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 18px;
  border-radius: 30px;
  color: var(--primary-dark);
  font-weight: 500;
}
.text-center { text-align: center; color: var(--muted); }

/* FAQ */
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.faq-item summary { padding: 16px 20px; font-weight: 600; cursor: pointer; color: var(--primary-dark); }
.faq-item p { padding: 0 20px 16px; margin: 0; color: var(--muted); }

/* CTA */
.cta-section { background: var(--primary); color: #fff; padding: 60px 0; text-align: center; }
.cta-section h2 { margin: 0 0 14px; }
.cta-section p { margin: 0 0 22px; opacity: 0.95; }
.cta-section a { color: #fff; text-decoration: underline; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-actions .btn-primary { background: #fff; color: var(--primary); }
.cta-actions .btn-secondary { background: var(--accent); color: #fff; }

/* Two column */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.col-media img { border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; }
.col-text h2 { color: var(--primary-dark); margin-top: 0; }
.col-text ul { padding-left: 20px; color: var(--muted); }
.col-text li { margin-bottom: 10px; }

/* Contact */
.contact-block { margin-bottom: 22px; }
.contact-block h3 { margin: 0 0 6px; color: var(--primary); font-size: 1rem; }
.contact-block p { margin: 0; font-size: 1.05rem; }
.contact-form { background: var(--surface); padding: 28px; border-radius: var(--radius); box-shadow: var(--shadow); }
.contact-form label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--text); }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 12px; margin-bottom: 16px;
  border: 1px solid var(--border); border-radius: 6px; font-family: inherit; font-size: 1rem;
}
.contact-form button { width: 100%; }
.form-note { font-size: 0.85rem; color: var(--muted); margin: 12px 0 0; }

/* Breadcrumb */
.breadcrumb { background: var(--surface); border-bottom: 1px solid var(--border); padding: 14px 0; }
.breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; gap: 8px; font-size: 0.9rem; color: var(--muted); }
.breadcrumb a { color: var(--primary); }

/* Footer */
.site-footer { background: var(--primary-dark); color: #dbeafe; padding: 50px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 30px; }
.footer-brand { color: #fff; font-size: 1.1rem; }
.site-footer h3 { color: #fff; font-size: 1rem; margin: 0 0 14px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #dbeafe; }
.copyright { border-top: 1px solid rgba(255,255,255,0.15); padding-top: 16px; text-align: center; font-size: 0.9rem; color: #93c5fd; }

/* Mobile CTA */
.mobile-cta {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: #fff; border-top: 1px solid var(--border);
  display: none; gap: 10px; padding: 10px 16px; z-index: 999;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
}
.mobile-cta a { flex: 1; text-align: center; padding: 12px; border-radius: var(--radius); font-weight: 600; }

/* Legal content */
.legal-content h2 { color: var(--primary-dark); margin-top: 32px; }

/* Responsive */
@media (max-width: 900px) {
  .two-col, .footer-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: #fff; border-top: 1px solid var(--border); }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; padding: 16px 20px; gap: 14px; }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  .hero-content { padding: 0 20px; }
  .hero-content h1 { font-size: 1.6rem; }
  .hero-content .lead { font-size: 1rem; }
  .section { padding: 50px 0; }
  .mobile-cta { display: flex; }
  body { padding-bottom: 80px; }
  .article-header h1 { font-size: 1.5rem; }
}