/* ===== 全局变量 ===== */
:root {
  --primary: #9B2C2C;
  --primary-dark: #742A2A;
  --primary-light: #FEF2F2;
  --secondary: #D69E2E;
  --accent: #DD6B20;
  --danger: #C53030;
  --text-dark: #1a1a2e;
  --text-gray: #666;
  --text-light: #999;
  --bg-light: #f5f6fa;
  --bg-white: #fff;
  --border: #e8e8e8;
  --shadow: 0 2px 20px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 30px rgba(155,44,44,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1200px;
  --header-height: 72px;
}

/* ===== 基础重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.6;
  font-size: 15px;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-height);
  background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); z-index: 1000;
  transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px; font-weight: 700; color: var(--primary);
}
.nav-logo .logo-icon {
  width: 40px; height: 40px; background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 22px;
}
.nav-logo img {
  height: 48px;
  width: auto;
}
.nav-menu { display: flex; align-items: center; gap: 36px; }
.nav-menu a {
  font-size: 16px; color: var(--text-dark); font-weight: 500;
  position: relative; transition: color 0.2s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }
.nav-menu a.active::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0; height: 3px;
  background: var(--primary); border-radius: 2px;
}
.nav-cta {
  padding: 10px 28px; background: var(--primary); color: #fff;
  border-radius: var(--radius-sm); font-size: 15px; font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; border-radius: var(--radius-sm);
  font-size: 16px; font-weight: 600; cursor: pointer;
  border: none; transition: all 0.3s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(155,44,44,0.3); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.6); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.btn-gold { background: var(--secondary); color: #fff; }
.btn-gold:hover { background: #B7791F; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(214,158,46,0.3); }

/* ===== 首页 Hero ===== */
.hero {
  min-height: 640px; display: flex; align-items: center; justify-content: center;
  text-align: center; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #9B2C2C 0%, #742A2A 50%, #5A1F1F 100%);
  padding-top: var(--header-height);
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(214,158,46,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; padding: 0 24px; }
.hero h1 { font-size: 52px; font-weight: 800; margin-bottom: 20px; line-height: 1.3; }
.hero p { font-size: 20px; opacity: 0.9; margin-bottom: 36px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; }
.hero-stats {
  display: flex; gap: 56px; margin-top: 60px; justify-content: center;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 40px; font-weight: 800; }
.hero-stat .label { font-size: 14px; opacity: 0.8; margin-top: 4px; }

/* ===== Section 通用 ===== */
.section { padding: 80px 0; }
.section-gray { background: var(--bg-light); }
.section-white { background: var(--bg-white); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { font-size: 36px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.section-header .subtitle { font-size: 17px; color: var(--text-gray); }
.section-header .divider {
  width: 56px; height: 4px; background: var(--primary); border-radius: 2px;
  margin: 20px auto 0;
}

/* ===== 服务卡片 ===== */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card {
  background: #fff; border-radius: var(--radius); padding: 36px 28px;
  box-shadow: var(--shadow); transition: all 0.3s; text-align: center;
  border: 1px solid transparent;
}
.service-card:hover {
  transform: translateY(-8px); box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}
.service-card .icon {
  width: 72px; height: 72px; border-radius: 18px; margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center; font-size: 36px;
}
.service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--text-gray); line-height: 1.7; }
.service-card .tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.service-card .tag { font-size: 12px; padding: 4px 12px; border-radius: 20px; background: var(--primary-light); color: var(--primary); }

/* ===== 数据统计 ===== */
.stats-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 60px 0; color: #fff;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats-item .num { font-size: 44px; font-weight: 800; }
.stats-item .label { font-size: 16px; opacity: 0.85; margin-top: 6px; }

/* ===== 城市覆盖 ===== */
.city-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.city-card {
  background: #fff; border-radius: var(--radius-sm); padding: 24px 16px;
  text-align: center; box-shadow: var(--shadow); transition: all 0.3s;
  border: 2px solid transparent;
}
.city-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.city-card .city-name { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.city-card .city-status { font-size: 13px; color: var(--secondary); }
.city-card.preparing .city-status { color: var(--accent); }

/* ===== 页面 Banner ===== */
.page-banner {
  background: linear-gradient(135deg, #9B2C2C 0%, #742A2A 100%);
  padding: 140px 0 60px; text-align: center; color: #fff;
}
.page-banner h1 { font-size: 42px; font-weight: 800; margin-bottom: 12px; }
.page-banner .breadcrumb { font-size: 15px; opacity: 0.8; }
.page-banner .breadcrumb a:hover { text-decoration: underline; }

/* ===== 关于我们 ===== */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-intro .text h2 { font-size: 32px; font-weight: 700; margin-bottom: 20px; }
.about-intro .text p { font-size: 16px; color: var(--text-gray); line-height: 2; margin-bottom: 16px; }
.about-intro .image {
  border-radius: var(--radius); overflow: hidden; height: 380px;
  background: linear-gradient(135deg, var(--primary-light), #FEFCBF);
  display: flex; align-items: center; justify-content: center;
}
.about-intro .image .placeholder { font-size: 120px; }

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.value-card {
  text-align: center; padding: 40px 28px; background: #fff;
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.value-card .icon { font-size: 48px; margin-bottom: 20px; }
.value-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.value-card p { font-size: 14px; color: var(--text-gray); line-height: 1.8; }

.timeline { max-width: 800px; margin: 0 auto; }
.timeline-item {
  display: flex; gap: 32px; padding-bottom: 48px; position: relative;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ''; position: absolute; left: 15px; top: 40px; bottom: 0;
  width: 2px; background: var(--border);
}
.timeline-item:last-child::before { display: none; }
.timeline-dot {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: var(--primary); color: #fff; display: flex;
  align-items: center; justify-content: center; font-size: 14px; font-weight: 700;
  z-index: 1;
}
.timeline-content h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.timeline-content .time { font-size: 14px; color: var(--primary); margin-bottom: 8px; }
.timeline-content p { font-size: 15px; color: var(--text-gray); line-height: 1.7; }

/* ===== 产品介绍 ===== */
.product-section { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 80px; }
.product-section:nth-child(even) { direction: rtl; }
.product-section:nth-child(even) .product-text { direction: ltr; }
.product-text h2 { font-size: 30px; font-weight: 700; margin-bottom: 16px; }
.product-text .desc { font-size: 16px; color: var(--text-gray); line-height: 2; margin-bottom: 24px; }
.product-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.product-feature {
  display: flex; align-items: center; gap: 10px; font-size: 15px;
}
.product-feature .check { color: var(--primary); font-size: 20px; }
.product-image {
  border-radius: var(--radius); height: 340px;
  display: flex; align-items: center; justify-content: center;
  font-size: 100px;
}

/* ===== 行业动态 ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: all 0.3s; cursor: pointer;
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.news-card .news-image {
  height: 200px; display: flex; align-items: center; justify-content: center;
  font-size: 60px;
}
.news-card .news-body { padding: 24px; }
.news-card .news-date { font-size: 13px; color: var(--text-light); margin-bottom: 8px; }
.news-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; line-height: 1.5; }
.news-card p { font-size: 14px; color: var(--text-gray); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .news-tag {
  display: inline-block; font-size: 12px; padding: 3px 12px; border-radius: 20px;
  background: var(--primary-light); color: var(--primary); margin-bottom: 12px;
}

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h2 { font-size: 30px; font-weight: 700; margin-bottom: 24px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 28px; }
.contact-item .icon {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  background: var(--primary-light); display: flex; align-items: center; justify-content: center;
  font-size: 24px;
}
.contact-item .info h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.contact-item .info p { font-size: 15px; color: var(--text-gray); }
.contact-form {
  background: #fff; padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow);
}
.contact-form h2 { font-size: 24px; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text-dark); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 2px solid var(--border);
  border-radius: var(--radius-sm); font-size: 15px; font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* 地图 */
.map-section { margin-top: 60px; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.map-placeholder {
  height: 360px; background: linear-gradient(135deg, #FEF2F2, #f5f6fa);
  display: flex; flex-items: center; justify-content: center; flex-direction: column;
  align-items: center; gap: 12px;
}
.map-placeholder .icon { font-size: 64px; }
.map-placeholder p { font-size: 16px; color: var(--text-gray); }

/* ===== Footer ===== */
.footer { background: #1a1a2e; color: #ccc; padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; font-size: 17px; font-weight: 600; margin-bottom: 20px; }
.footer-col p { font-size: 14px; line-height: 2; color: #999; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { font-size: 14px; color: #999; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--primary); }
.footer-logo {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
  font-size: 20px; font-weight: 700; color: #fff;
}
.footer-logo img {
  filter: brightness(0) invert(1);
  opacity: 0.95;
  max-width: 220px;
  height: auto;
}
.footer-logo .logo-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.footer-qr { display: flex; gap: 20px; margin-top: 20px; }
.footer-qr-item { text-align: center; }
.footer-qr-item .qr-box {
  width: 100px; height: 100px; background: #fff; border-radius: 8px;
  display: flex; align-items: center; justify-content: center; font-size: 40px;
}
.footer-qr-item p { font-size: 12px; margin-top: 8px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center;
}
.footer-bottom p { font-size: 14px; color: #666; }
.footer-bottom a { color: #666; }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 回到顶部 ===== */
.back-top {
  position: fixed; bottom: 40px; right: 40px; width: 48px; height: 48px;
  background: var(--primary); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 24px;
  cursor: pointer; opacity: 0; pointer-events: none; transition: all 0.3s;
  z-index: 999; box-shadow: 0 4px 12px rgba(220,53,69,0.4);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-4px); }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease-out both; }
.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }

/* ===== 移动端汉堡菜单 ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  margin: 3px 0;
  transition: all 0.3s ease;
  border-radius: 2px;
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 移动端导航遮罩 */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  opacity: 0;
  transition: opacity 0.3s;
}
.nav-overlay.active {
  display: block;
  opacity: 1;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root { --header-height: 64px; }
  .container { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
  .nav-menu { gap: 24px; }
  .nav-menu a { font-size: 15px; }
  .nav-cta { padding: 8px 20px; font-size: 14px; }

  .section { padding: 60px 0; }
  .section-header { margin-bottom: 40px; }
  .section-header h2 { font-size: 30px; }

  .hero { min-height: 520px; }
  .hero h1 { font-size: 42px; }
  .hero p { font-size: 18px; }
  .hero-stats { gap: 40px; margin-top: 48px; }
  .hero-stat .num { font-size: 32px; }

  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .city-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .stats-item .num { font-size: 36px; }
  .news-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .about-intro, .product-section, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .product-section:nth-child(even) { direction: ltr; }
  .product-section { margin-bottom: 60px; }

  .page-banner { padding: 120px 0 50px; }
  .page-banner h1 { font-size: 34px; }

  .values-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }

  .timeline { max-width: 100%; }
}

@media (max-width: 768px) {
  :root { --header-height: 56px; }
  body { font-size: 14px; }
  .container { padding: 0 16px; }

  /* 导航 - 汉堡菜单 */
  .nav-inner { padding: 0 16px; }
  .nav-logo { font-size: 18px; }
  .nav-logo img { height: 36px; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 24px 24px;
    gap: 0;
    transition: right 0.3s ease;
    z-index: 1000;
    display: flex;
    overflow-y: auto;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
  }
  .nav-menu.active { right: 0; }
  .nav-menu a {
    font-size: 17px;
    padding: 16px 0;
    width: 100%;
    border-bottom: 1px solid var(--border);
    font-weight: 500;
  }
  .nav-menu a.active::after { display: none; }
  .nav-menu a.active { color: var(--primary); font-weight: 600; }

  /* 移动端CTA按钮放在菜单底部 */
  .nav-menu .mobile-cta {
    margin-top: 24px;
    padding: 14px 28px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 600;
    border-bottom: none;
  }

  /* Hero */
  .hero { min-height: 480px; padding-top: var(--header-height); }
  .hero-content { padding: 0 16px; }
  .hero h1 { font-size: 30px; line-height: 1.4; margin-bottom: 16px; }
  .hero p { font-size: 15px; margin-bottom: 28px; line-height: 1.7; }
  .hero-actions { flex-direction: column; gap: 12px; padding: 0 20px; }
  .hero-actions .btn { width: 100%; justify-content: center; padding: 14px 28px; font-size: 15px; }
  .hero-stats { flex-direction: row; flex-wrap: wrap; gap: 24px; margin-top: 40px; justify-content: space-around; }
  .hero-stat { flex: 1 1 40%; }
  .hero-stat .num { font-size: 28px; }
  .hero-stat .label { font-size: 13px; }

  /* Section */
  .section { padding: 48px 0; }
  .section-header { margin-bottom: 32px; }
  .section-header h2 { font-size: 24px; margin-bottom: 8px; }
  .section-header .subtitle { font-size: 15px; }
  .section-header .divider { width: 40px; height: 3px; margin-top: 16px; }

  /* 按钮 */
  .btn { padding: 12px 28px; font-size: 15px; }

  /* 服务卡片 */
  .service-grid { grid-template-columns: 1fr; gap: 16px; }
  .service-card { padding: 28px 20px; }
  .service-card .icon { width: 60px; height: 60px; font-size: 28px; margin-bottom: 16px; }
  .service-card h3 { font-size: 18px; }
  .service-card p { font-size: 13px; }

  /* 数据统计 */
  .stats-bar { padding: 40px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stats-item .num { font-size: 28px; }
  .stats-item .label { font-size: 14px; }

  /* 城市覆盖 */
  .city-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .city-card { padding: 20px 12px; }
  .city-card .city-name { font-size: 17px; }
  .city-card .city-status { font-size: 12px; }

  /* 页面Banner */
  .page-banner { padding: 100px 0 40px; }
  .page-banner h1 { font-size: 26px; margin-bottom: 8px; }
  .page-banner .breadcrumb { font-size: 14px; }

  /* 关于我们 */
  .about-intro { gap: 32px; }
  .about-intro .text h2 { font-size: 24px; margin-bottom: 16px; }
  .about-intro .text p { font-size: 15px; line-height: 1.8; }
  .about-intro .image { height: 240px; }
  .about-intro .image .placeholder { font-size: 80px; }

  .values-grid { grid-template-columns: 1fr; gap: 20px; }
  .value-card { padding: 28px 20px; }
  .value-card .icon { font-size: 40px; margin-bottom: 16px; }
  .value-card h3 { font-size: 18px; }

  .timeline-item { gap: 20px; padding-bottom: 32px; }
  .timeline-item::before { left: 11px; }
  .timeline-dot { width: 24px; height: 24px; font-size: 12px; }
  .timeline-content h3 { font-size: 16px; }
  .timeline-content .time { font-size: 13px; }
  .timeline-content p { font-size: 14px; }

  /* 产品介绍 */
  .product-section { gap: 32px; margin-bottom: 48px; }
  .product-text h2 { font-size: 22px; margin-bottom: 12px; }
  .product-text .desc { font-size: 15px; line-height: 1.8; margin-bottom: 20px; }
  .product-features { grid-template-columns: 1fr; gap: 12px; }
  .product-feature { font-size: 14px; }
  .product-image { height: 240px; font-size: 70px; }

  /* 文章列表 */
  .news-grid { grid-template-columns: 1fr; gap: 16px; }
  .news-card .news-image { height: 180px; font-size: 48px; }
  .news-card .news-body { padding: 20px; }
  .news-card h3 { font-size: 16px; }
  .news-card p { font-size: 13px; }

  /* 联系我们 */
  .contact-grid { gap: 32px; }
  .contact-info h2 { font-size: 24px; margin-bottom: 20px; }
  .contact-item { margin-bottom: 20px; gap: 12px; }
  .contact-item .icon { width: 40px; height: 40px; font-size: 20px; }
  .contact-item .info h4 { font-size: 15px; }
  .contact-item .info p { font-size: 14px; }
  .contact-form { padding: 24px 20px; }
  .contact-form h2 { font-size: 20px; margin-bottom: 20px; }
  .form-group { margin-bottom: 16px; }
  .form-group label { font-size: 13px; margin-bottom: 6px; }
  .form-group input, .form-group textarea, .form-group select {
    padding: 10px 14px; font-size: 14px;
  }
  .form-group textarea { min-height: 100px; }

  .map-section { margin-top: 40px; }
  .map-placeholder { height: 240px; }
  .map-placeholder .icon { font-size: 48px; }
  .map-placeholder p { font-size: 14px; }

  /* Footer */
  .footer { padding: 40px 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; margin-bottom: 28px; }
  .footer-col h4 { font-size: 16px; margin-bottom: 16px; }
  .footer-col p { font-size: 13px; }
  .footer-col ul li { margin-bottom: 10px; }
  .footer-col ul li a { font-size: 13px; }
  .footer-logo { font-size: 18px; margin-bottom: 12px; }
  .footer-qr { gap: 16px; }
  .footer-qr-item .qr-box { width: 80px; height: 80px; font-size: 32px; }
  .footer-qr-item p { font-size: 11px; }
  .footer-bottom { padding-top: 16px; }
  .footer-bottom p { font-size: 12px; }

  /* 回到顶部 */
  .back-top {
    width: 40px; height: 40px; font-size: 20px;
    bottom: 20px; right: 20px;
  }

  /* 文章详情页适配 */
  .article-detail { padding: 24px 0; }
  .article-detail h1 { font-size: 22px; line-height: 1.4; }
  .article-meta { font-size: 13px; flex-wrap: wrap; gap: 12px; }
  .article-content { font-size: 15px; line-height: 1.8; }
  .article-content p { margin-bottom: 16px; }
  .article-content h2 { font-size: 18px; margin-top: 24px; margin-bottom: 12px; }
  .article-content h3 { font-size: 16px; margin-top: 20px; margin-bottom: 10px; }

  /* 文章导航 */
  .article-nav { flex-direction: column; gap: 12px; }
  .article-nav .prev-article,
  .article-nav .next-article { width: 100%; }

  /* 分类标签 */
  .category-tabs {
    flex-wrap: wrap;
    gap: 8px;
  }
  .category-tab {
    padding: 8px 16px;
    font-size: 13px;
  }

  /* 相关文章 */
  .related-articles h3 { font-size: 18px; }
  .related-list { gap: 12px; }
  .related-item { padding: 16px; }
  .related-item h4 { font-size: 14px; }

  /* 留言成功提示 - 移动端适配 */
  .success-toast {
    width: 90%;
    max-width: 320px;
    font-size: 14px;
    padding: 14px 20px;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 26px; }
  .hero p { font-size: 14px; }
  .section-header h2 { font-size: 22px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stats-item .num { font-size: 24px; }
  .stats-item .label { font-size: 13px; }
  .city-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { gap: 16px; }
  .hero-stat .num { font-size: 24px; }

  .contact-form { padding: 20px 16px; }
  .page-banner h1 { font-size: 24px; }

  .btn { padding: 11px 24px; font-size: 14px; }
}

/* ===== 横屏平板优化 ===== */
@media (min-width: 769px) and (max-width: 1024px) and (orientation: landscape) {
  .hero { min-height: 480px; }
  .hero h1 { font-size: 38px; }
}