/* === 中科万嘉复合材料 - 主样式表 === */

:root {
  --primary: #1565C0;
  --primary-dark: #0D47A1;
  --primary-light: #42A5F5;
  --accent: #FF6F00;
  --accent-light: #FFA040;
  --success: #2E7D32;
  --danger: #C62828;
  --bg: #F5F7FA;
  --bg-white: #FFFFFF;
  --bg-dark: #0D1B2A;
  --bg-card: #FFFFFF;
  --text: #263238;
  --text-secondary: #546E7A;
  --text-light: #90A4AE;
  --border: #E0E0E0;
  --border-light: #F0F0F0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: 0.25s ease;
  --max-width: 1200px;
  --header-height: 68px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ===== Header ===== */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  display: flex; align-items: center;
}

.header-inner {
  width: 100%; max-width: var(--max-width);
  margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center;
}

.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 700; color: var(--primary-dark);
}
.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 20px; font-weight: 800;
}
.logo-img {
  height: 48px;
  width: auto;
  display: block;
}
.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
  white-space: nowrap;
}

nav { display: flex; align-items: center; gap: 6px; margin-left: 50px; }
nav a {
  padding: 10px 18px; border-radius: var(--radius);
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition);
  white-space: nowrap;
}
nav a:hover, nav a.active {
  color: var(--primary); background: rgba(21,101,192,0.08);
}

.mobile-menu-btn {
  display: none; background: none; border: none;
  font-size: 24px; color: var(--text); cursor: pointer;
  padding: 10px;
  min-width: 44px;
  min-height: 44px;
}

@media (max-width: 768px) {
  nav { display: none; }
  .mobile-menu-btn { display: block; }
  nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--header-height); left: 0; right: 0;
    background: var(--bg-white); padding: 16px; gap: 8px;
    box-shadow: var(--shadow); border-bottom: 1px solid var(--border);
  }
}

/* ===== Hero ===== */
.hero {
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1976D2 50%, #0D47A1 100%);
  color: #fff; padding: 80px 24px 90px;
  position: relative; overflow: hidden;
  text-align: center;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-inner { max-width: var(--max-width); margin: 0 auto; position: relative; z-index: 1; }
.hero h1 { font-size: clamp(28px, 5vw, 46px); font-weight: 800; margin-bottom: 16px; letter-spacing: 1px; }
.hero p { font-size: 18px; opacity: 0.9; margin-bottom: 36px; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 40px; }
.hero-tags span {
  background: rgba(255,255,255,0.15); backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 8px 20px; border-radius: 50px;
  font-size: 14px; font-weight: 500;
}
.hero-stats {
  display: flex; justify-content: center; gap: 48px;
  margin-top: 32px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 42px; font-weight: 800; color: var(--accent-light); display: block; }
.hero-stat-label { font-size: 15px; opacity: 0.85; margin-top: 4px; display: block; }

/* ===== Section Common ===== */
section { padding: 80px 24px; }
.section-inner { max-width: var(--max-width); margin: 0 auto; }
.section-title {
  text-align: center; margin-bottom: 52px;
}
.section-title h2 { font-size: 32px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.section-title p { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ===== Features ===== */
.features { background: var(--bg-white); }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px;
}
.feature-card {
  text-align: center; padding: 36px 24px;
  border-radius: var(--radius-lg); border: 1px solid var(--border-light);
  transition: var(--transition); background: var(--bg);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; color: #fff;
}
.feature-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--text); }
.feature-card p { color: var(--text-secondary); font-size: 14px; }

/* ===== Products ===== */
.products { background: var(--bg); }
.products-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px;
}
.product-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow);
  transition: var(--transition); border: 1px solid var(--border-light);
  display: flex; flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.product-img {
  height: 220px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.product-img svg { width: 100%; height: 100%; }
.product-photo { width: 100%; height: 100%; object-fit: cover; display: block; }
.case-photo { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 8px; }
.faq-img { max-width: 100%; border-radius: 8px; margin-top: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.product-img .tag {
  position: absolute; top: 12px; left: 12px;
  background: var(--accent); color: #fff; padding: 4px 12px;
  border-radius: 50px; font-size: 12px; font-weight: 600;
}
.product-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.product-body h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.product-body p { color: var(--text-secondary); font-size: 14px; margin-bottom: 16px; flex: 1; }
.product-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.product-tags span {
  background: #E3F2FD; color: var(--primary);
  padding: 4px 12px; border-radius: 50px;
  font-size: 12px; font-weight: 500;
}
.product-params {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px;
  margin-bottom: 16px; padding: 12px; background: var(--bg);
  border-radius: var(--radius); font-size: 13px;
}
.product-params div { text-align: center; }
.product-params .param-label { color: var(--text-light); font-size: 11px; display: block; }
.product-params .param-value { color: var(--text); font-weight: 600; display: block; }
.btn {
  display: inline-block; padding: 12px 28px; border-radius: var(--radius);
  font-weight: 600; font-size: 15px; cursor: pointer; border: none;
  transition: var(--transition); text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #E65100; }
.btn-center { text-align: center; margin-top: 40px; }
.product-btn { margin-top: auto; display: block; }

/* ===== Cases ===== */
.cases { background: var(--bg-white); }
.cases-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 24px;
}
@media (max-width: 600px) {
  .cases-grid { grid-template-columns: 1fr; }
}
.case-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow);
  display: flex; transition: var(--transition);
  border: 1px solid var(--border-light);
}
.case-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.case-img {
  width: 160px; min-width: 160px;
  display: flex; align-items: center; justify-content: center;
}
.case-body {
  padding: 20px 24px; flex: 1;
  display: flex; flex-direction: column; justify-content: center;
}
.case-body .case-type { font-size: 12px; color: var(--accent); font-weight: 600; text-transform: uppercase; margin-bottom: 6px; }
.case-body h3 { font-size: 18px; margin-bottom: 6px; }
.case-body .case-location { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.case-body p { font-size: 14px; color: var(--text-secondary); margin-bottom: 10px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.case-tags span {
  background: #E8F5E9; color: var(--success);
  padding: 3px 10px; border-radius: 50px; font-size: 12px;
}
@media (max-width: 500px) {
  .case-card { flex-direction: column; }
  .case-img { width: 100%; height: 140px; }
}

/* ===== Advantages ===== */
.advantages { background: var(--bg); }
.adv-grid {
  display: flex; justify-content: center; gap: 24px; flex-wrap: nowrap;
}
.adv-card {
  flex: 1; min-width: 0;
  text-align: center; padding: 32px 12px;
  background: var(--bg-white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); transition: var(--transition);
  border: 1px solid var(--border-light);
}
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.adv-icon {
  width: 48px; height: 48px; margin: 0 auto 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
}
.adv-icon svg { width: 24px; height: 24px; fill: #fff; }
.adv-card h3 { font-size: 15px; margin-bottom: 6px; color: var(--text); }
.adv-card p { color: var(--text-secondary); font-size: 13px; }

/* ===== About ===== */
.about { background: var(--bg-white); }
.about-content {
  display: flex; gap: 60px; align-items: flex-start;
}
.about-text { flex: 1; }
.about-text p {
  color: var(--text-secondary); font-size: 15px; line-height: 1.8;
  margin-bottom: 16px;
}
.about-text b { color: var(--primary); }
.about-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  flex-shrink: 0;
}
.about-stat {
  text-align: center; padding: 28px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-lg); color: #fff;
}
.about-stat-num { font-size: 30px; font-weight: 800; display: block; }
.about-stat-label { font-size: 13px; opacity: 0.9; margin-top: 4px; display: block; }
@media (max-width: 768px) {
  .about-content { flex-direction: column; gap: 32px; }
  .about-stats { grid-template-columns: 1fr 1fr; width: 100%; }
}

/* ===== News ===== */
.news { background: var(--bg-white); }
.news-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px;
}
.news-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); overflow: hidden;
  transition: var(--transition); border: 1px solid var(--border-light);
  display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-img {
  height: 180px; display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.news-img svg { width: 100%; height: 100%; }
.news-photo { width: 100%; height: 100%; object-fit: cover; }
.news-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.news-meta {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 10px; font-size: 13px; color: var(--text-light);
}
.news-category {
  background: #E3F2FD; color: var(--primary);
  padding: 3px 10px; border-radius: 50px; font-size: 12px;
}
.news-body h3 { font-size: 18px; margin-bottom: 8px; line-height: 1.4; }
.news-body p { font-size: 14px; color: var(--text-secondary); flex: 1; margin-bottom: 16px; }
.news-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.news-tags span {
  background: var(--bg); color: var(--text-secondary);
  padding: 3px 10px; border-radius: 50px; font-size: 12px;
}

/* ===== Service Process ===== */
.process { background: var(--bg); }
.process-steps {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
}
@media (max-width: 900px) {
  .process-steps { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 500px) {
  .process-steps { grid-template-columns: repeat(2, 1fr); }
}
.process-step {
  text-align: center; padding: 28px 16px;
  background: var(--bg-white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); position: relative;
  transition: var(--transition);
}
.process-step:hover { transform: translateY(-3px); }
.process-step-num {
  width: 48px; height: 48px; margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 50%; color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700;
}
.process-step h3 { font-size: 15px; margin-bottom: 4px; }
.process-step p { font-size: 12px; color: var(--text-secondary); }

/* ===== Region Page ===== */
.region-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px;
}
.region-card {
  padding: 24px; background: var(--bg-white);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}
.region-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.region-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--primary); }
.region-card p { font-size: 14px; color: var(--text-secondary); }

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--primary-dark), #1976D2);
  color: #fff; text-align: center;
}
.cta h2 { font-size: 30px; margin-bottom: 12px; }
.cta p { font-size: 16px; opacity: 0.9; margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta .btn-cta {
  display: inline-block; background: var(--accent); color: #fff;
  padding: 14px 36px; border-radius: 50px; font-size: 17px; font-weight: 700;
  margin: 0 8px 12px;
  transition: var(--transition);
}
.cta .btn-cta:hover { background: #E65100; transform: translateY(-2px); }
.cta .btn-cta-outline {
  display: inline-block; border: 2px solid rgba(255,255,255,0.6); color: #fff;
  padding: 14px 36px; border-radius: 50px; font-size: 17px; font-weight: 600;
  margin: 0 8px 12px;
  transition: var(--transition);
}
.cta .btn-cta-outline:hover { background: rgba(255,255,255,0.15); }

/* ===== FAQ ===== */
.faq {
  background: var(--bg);
  padding: 60px 24px;
}
.faq .section-title h2 { font-size: 28px; }
.faq-grid {
  max-width: 900px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 12px;
}
.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}
.faq-question {
  width: 100%; text-align: left; background: none; border: none;
  padding: 18px 24px; font-size: 16px; font-weight: 600;
  color: var(--text); cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; font-family: inherit;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question .faq-icon {
  flex-shrink: 0; width: 28px; height: 28px;
  background: var(--bg); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--primary);
  transition: var(--transition);
}
.faq-item.open .faq-icon {
  background: var(--primary); color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.open .faq-answer {
  max-height: 400px;
}
.faq-answer-inner {
  padding: 0 24px 20px; font-size: 15px;
  color: var(--text-secondary); line-height: 1.8;
}
@media (max-width: 600px) {
  .faq-question { font-size: 15px; padding: 14px 16px; }
  .faq-answer-inner { padding: 0 16px 16px; font-size: 14px; }
}

/* ===== Footer ===== */
footer {
  background: var(--bg-dark); color: rgba(255,255,255,0.7);
  padding: 60px 24px 30px;
}
.footer-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .footer-inner { grid-template-columns: 1fr; }
}
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-col p, .footer-col a { font-size: 14px; line-height: 2.2; display: block; }
.footer-col a:hover { color: var(--primary-light); }
.footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-bottom {
  max-width: var(--max-width); margin: 40px auto 0; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
  text-align: center; font-size: 13px; color: rgba(255,255,255,0.5);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 24px 0;
  font-size: 14px; color: var(--text-light);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb .sep { margin: 0 8px; }

/* ===== Contact Page ===== */
.contact-section { padding: 80px 24px; background: var(--bg); }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}
.contact-info h2, .contact-form-wrap h2 {
  font-size: 24px; margin-bottom: 8px; color: var(--text);
}
.contact-intro { color: var(--text-secondary); font-size: 15px; margin-bottom: 36px; }
.contact-item {
  display: flex; gap: 16px; margin-bottom: 28px;
}
.contact-icon {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact-icon svg { width: 24px; height: 24px; fill: #fff; }
.contact-detail h3 { font-size: 16px; margin-bottom: 4px; color: var(--text); }
.contact-value { font-size: 18px; font-weight: 600; color: var(--primary); display: block; margin-bottom: 2px; }
.contact-detail span { font-size: 13px; color: var(--text-light); }

.contact-form {
  background: var(--bg-white); padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 500;
  color: var(--text); margin-bottom: 6px;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 16px; font-family: inherit;
  transition: var(--transition);
  background: var(--bg);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(21,101,192,0.1);
}
.form-submit {
  width: 100%; padding: 14px; font-size: 16px; font-weight: 600;
  cursor: pointer; border: none;
}

.contact-bottom { padding: 80px 24px; background: var(--bg-white); }
.contact-bottom h2 { text-align: center; font-size: 28px; margin-bottom: 48px; }
.contact-reasons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.contact-reason { text-align: center; }
.reason-icon { font-size: 48px; margin-bottom: 16px; }
.contact-reason h3 { font-size: 18px; margin-bottom: 8px; color: var(--text); }
.contact-reason p { color: var(--text-secondary); font-size: 14px; }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-reasons { grid-template-columns: 1fr 1fr; }
}

/* ===== Detail Content ===== */
.detail-article { max-width: 800px; margin: 0 auto; }
.detail-article h1 { font-size: 32px; margin-bottom: 24px; }
.detail-article h2 { font-size: 24px; margin: 40px 0 16px; }
.detail-article h3 { font-size: 20px; margin: 32px 0 12px; }
.detail-article p { margin-bottom: 16px; color: var(--text-secondary); line-height: 1.9; }
.detail-article ul { list-style: disc; padding-left: 24px; margin-bottom: 16px; }
.detail-article ul li { margin-bottom: 8px; color: var(--text-secondary); }
.detail-article .meta {
  color: var(--text-light); font-size: 14px;
  margin-bottom: 32px; padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}
.back-link { margin-top: 48px; }
.back-link a { color: var(--primary); font-weight: 500; }

/* ===== Page Header ===== */
.page-header {
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark), #1976D2);
  color: #fff; padding: 48px 24px;
  text-align: center;
}
.page-header h1 { font-size: 32px; font-weight: 700; }

/* ===== 城市分站专用样式 ===== */
.city-advantages {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
}
.city-advantages span {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; padding: 10px 20px; border-radius: 50px;
  font-size: 14px; font-weight: 500;
  transition: var(--transition);
}
.city-advantages span:hover {
  transform: translateY(-2px); box-shadow: var(--shadow);
}
.city-case-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.region-case-tag {
  background: #E8F5E9; color: var(--success);
  padding: 6px 14px; border-radius: 50px; font-size: 13px;
  font-weight: 500;
}
.city-product-item {
  padding: 10px 14px; background: var(--bg-white);
  border-radius: var(--radius); font-size: 14px;
  color: var(--text-secondary); border: 1px solid var(--border-light);
  transition: var(--transition);
}
.city-product-item:hover {
  border-color: var(--primary-light);
  color: var(--text);
}
.city-product-item strong { color: var(--text); }
.city-subsite-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px;
}
.city-subsite-card {
  padding: 20px; background: var(--bg-white);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  text-decoration: none; display: block;
}
.city-subsite-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}
.city-subsite-card h3 {
  font-size: 16px; margin-bottom: 6px; color: var(--primary);
}
.city-subsite-card p {
  font-size: 13px; color: var(--text-secondary);
}

/* 城市分站响应式 */
@media (max-width:768px) {
  .city-advantages { gap: 8px; }
  .city-advantages span { padding: 8px 14px; font-size: 13px; }
}
@media (max-width:600px) {
  .city-hero-section [style*="grid-template-columns:1fr 1fr"] {
    display: block !important;
  }
  .city-hero-section [style*="grid-template-columns:1fr 1fr"] > * {
    margin-bottom: 32px;
  }
}

/* ============================================================
   ===== 手机版全面优化 (max-width: 768px) =====
   ============================================================ */
@media (max-width: 768px) {
  /* Header 紧凑化 */
  :root { --header-height: 56px; }
  .header-inner { padding: 0 12px; }
  .logo-img { height: 34px; }
  .logo-text { font-size: 13px; }
  .mobile-menu-btn { font-size: 20px; padding: 4px; }
  nav.open {
    top: 56px; padding: 12px;
  }
  nav.open a {
    padding: 12px 14px; font-size: 15px;
    border-bottom: 1px solid var(--border-light);
  }
  nav.open a:last-child { border-bottom: none; }

  /* Hero 精简 */
  .hero { padding: 40px 16px 44px; }
  .hero h1 { font-size: 22px; margin-bottom: 10px; letter-spacing: 0.5px; }
  .hero p { font-size: 14px; margin-bottom: 20px; line-height: 1.6; }
  .hero-tags { gap: 6px; margin-bottom: 24px; }
  .hero-tags span { padding: 5px 12px; font-size: 12px; }
  .hero-stats { gap: 20px; margin-top: 20px; }
  .hero-stat-num { font-size: 26px; }
  .hero-stat-label { font-size: 12px; }

  /* Section 间距压缩 */
  section { padding: 44px 16px; }
  .section-title { margin-bottom: 28px; }
  .section-title h2 { font-size: 22px; margin-bottom: 8px; }
  .section-title p { font-size: 14px; }

  /* Features 单列 */
  .features-grid { grid-template-columns: 1fr; gap: 14px; }
  .feature-card { padding: 24px 16px; }
  .feature-icon { width: 48px; height: 48px; font-size: 22px; margin-bottom: 14px; }
  .feature-card h3 { font-size: 16px; }
  .feature-card p { font-size: 13px; }

  /* Products 单列紧凑 */
  .products-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-img { height: 170px; }
  .product-body { padding: 16px; }
  .product-body h3 { font-size: 17px; margin-bottom: 6px; }
  .product-body p { font-size: 13px; margin-bottom: 12px; }
  .product-tags { gap: 5px; margin-bottom: 12px; }
  .product-tags span { padding: 3px 10px; font-size: 11px; }
  .product-params { padding: 10px; gap: 6px; margin-bottom: 12px; }
  .product-params .param-label { font-size: 10px; }
  .product-params .param-value { font-size: 12px; }

  /* Cases 紧凑 */
  .cases-grid { grid-template-columns: 1fr; gap: 14px; }
  .case-body { padding: 14px 16px; }
  .case-body h3 { font-size: 16px; }
  .case-body p { font-size: 13px; }

  /* Advantages 2列换行 */
  .adv-grid { flex-wrap: wrap; gap: 12px; }
  .adv-card { flex: 1 1 calc(50% - 12px); min-width: calc(50% - 12px); padding: 18px 8px; }
  .adv-card h3 { font-size: 13px; }
  .adv-card p { font-size: 12px; }
  .adv-icon { width: 40px; height: 40px; margin-bottom: 10px; }
  .adv-icon svg { width: 20px; height: 20px; }

  /* About 精简 */
  .about-content { gap: 24px; }
  .about-text p { font-size: 14px; line-height: 1.7; }
  .about-stats { gap: 10px; }
  .about-stat { padding: 20px 12px; }
  .about-stat-num { font-size: 22px; }
  .about-stat-label { font-size: 12px; }

  /* News 单列 */
  .news-grid { grid-template-columns: 1fr; gap: 16px; }
  .news-img { height: 160px; }
  .news-body { padding: 16px; }
  .news-body h3 { font-size: 16px; }
  .news-body p { font-size: 13px; }

  /* Process 2列 */
  .process-steps { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .process-step { padding: 20px 10px; }
  .process-step h3 { font-size: 14px; }
  .process-step p { font-size: 11px; }
  .process-step-num { width: 40px; height: 40px; font-size: 17px; margin-bottom: 10px; }

  /* CTA 按钮全宽 */
  .cta h2 { font-size: 20px; margin-bottom: 8px; }
  .cta p { font-size: 14px; margin-bottom: 20px; }
  .cta .btn-cta, .cta .btn-cta-outline {
    display: block; width: 100%;
    margin: 0 0 10px; padding: 12px;
    font-size: 15px; border-radius: 8px;
  }

  /* FAQ 精简 */
  .faq { padding: 36px 16px; }
  .faq .section-title h2 { font-size: 22px; }
  .faq-question { font-size: 14px; padding: 14px 14px; gap: 10px; }
  .faq-answer-inner { padding: 0 14px 14px; font-size: 13px; line-height: 1.7; }
  .faq-icon { width: 24px; height: 24px; font-size: 16px; }

  /* Footer 精简 */
  footer { padding: 36px 16px 20px; }
  .footer-inner { gap: 20px; }
  .footer-col h4 { font-size: 14px; margin-bottom: 10px; }
  .footer-col p, .footer-col a { font-size: 13px; line-height: 2; }
  .footer-brand { font-size: 17px; }
  .footer-bottom { font-size: 12px; margin-top: 24px; padding-top: 16px; }

  /* Page header */
  .page-header { padding: 28px 16px; }
  .page-header h1 { font-size: 22px; }
  .page-header p { font-size: 13px; }

  /* Contact */
  .contact-section { padding: 36px 16px; }
  .contact-info h2, .contact-form-wrap h2 { font-size: 20px; }
  .contact-intro { font-size: 14px; margin-bottom: 24px; }
  .contact-item { gap: 12px; margin-bottom: 20px; }
  .contact-icon { width: 40px; height: 40px; }
  .contact-icon svg { width: 20px; height: 20px; }
  .contact-detail h3 { font-size: 14px; }
  .contact-value { font-size: 16px; }
  .contact-form { padding: 20px 16px; }
  .form-group input, .form-group select, .form-group textarea {
    padding: 12px 14px; font-size: 16px;
  }
  .form-submit { padding: 14px; font-size: 16px; }
  .contact-bottom { padding: 36px 16px; }
  .contact-bottom h2 { font-size: 22px; margin-bottom: 28px; }
  .contact-reasons { gap: 16px; }
  .reason-icon { font-size: 36px; margin-bottom: 10px; }
  .contact-reason h3 { font-size: 15px; }
  .contact-reason p { font-size: 12px; }

  /* Buttons */
  .btn { padding: 10px 20px; font-size: 14px; }
  .btn-center { margin-top: 24px; }

  /* Breadcrumb */
  .breadcrumb { padding: 12px 0; font-size: 13px; }

  /* Detail article */
  .detail-article h1 { font-size: 22px; margin-bottom: 16px; }
  .detail-article h2 { font-size: 18px; margin: 28px 0 12px; }
  .detail-article h3 { font-size: 16px; margin: 24px 0 10px; }
  .detail-article p { font-size: 14px; line-height: 1.8; }

  /* Region cards */
  .region-grid { grid-template-columns: 1fr; gap: 14px; }
  .region-card { padding: 16px; }
  .city-subsite-grid { grid-template-columns: 1fr; gap: 12px; }

  /* Body 底部留出浮动栏空间 */
  body { padding-bottom: 60px; }
}

/* ===== 超小屏 (max-width: 480px) ===== */
@media (max-width: 480px) {
  .hero h1 { font-size: 19px; }
  .hero p { font-size: 13px; }
  .hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-stat-num { font-size: 22px; }
  .hero-stat-label { font-size: 11px; }

  .section-title h2 { font-size: 19px; }

  .product-params {
    grid-template-columns: 1fr 1fr;
  }
  .product-params div:last-child {
    grid-column: span 2;
  }

  .adv-card { flex: 1 1 100%; }

  .contact-reasons { grid-template-columns: 1fr 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 16px; }

  .logo-text { font-size: 12px; }
  .logo-img { height: 30px; }
}

/* ===== 底部导航栏 (仅手机) ===== */
.mobile-nav { display: none; }
@media (max-width: 768px) {
  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 999;
    background: #1a1a2e;
    box-shadow: 0 -2px 12px rgba(0,0,0,0.2);
    padding: 6px 4px 8px;
    gap: 2px;
    align-items: center;
    justify-content: space-around;
  }
  .mobile-nav a {
    flex: 1;
    text-align: center;
    padding: 10px 2px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    color: #d0d0d0;
    background: transparent;
    transition: var(--transition);
    white-space: nowrap;
    line-height: 1.2;
  }
  .mobile-nav a.active {
    background: #1565C0;
    color: #fff;
    font-weight: 600;
  }
  .mobile-nav a:active {
    background: rgba(255,255,255,0.1);
    color: #fff;
  }
  .mobile-nav a.active:active {
    background: #0D47A1;
  }
  /* 给底部内容加padding避免被导航栏遮挡 */
  body {
    padding-bottom: 60px;
  }
}