/* =========================================
   陕西安达君信商贸有限公司 - 气体销售官网
   主样式文件
   设计风格：Material Design 风格，基于 Bootstrap 5
   配色：工业蓝 + 安全橙，传达信赖与专业
   ========================================= */

/* ---- CSS 变量（全局主题色） ---- */
:root {
  /* 品牌色 */
  --primary: #0B3D91;
  --primary-light: #1565C0;
  --primary-dark: #072B66;
  --primary-rgb: 11, 61, 145;

  /* 强调色 */
  --accent: #F57C00;
  --accent-dark: #E65100;
  --accent-light: #FFB74D;
  --accent-rgb: 245, 124, 0;

  /* 文字色 */
  --text-dark: #1a2332;
  --text-body: #4a5568;
  --text-muted: #718096;
  --text-light: #a0aec0;

  /* 背景色 */
  --bg-body: #ffffff;
  --bg-light: #f0f4f8;
  --bg-dark: #0a1628;
  --bg-card: #ffffff;

  /* 其他 */
  --border-color: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(11,61,145,0.10);
  --shadow-lg: 0 8px 40px rgba(11,61,145,0.15);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 80px;
}
body {
  font-family: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB',
               'Microsoft YaHei', 'WenQuanYi Micro Hei', system-ui, sans-serif;
  color: var(--text-body);
  background: var(--bg-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}
/* 键盘焦点可见性 */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
img { max-width: 100%; display: block; }
h1, h2, h3, h4, h5, h6 {
  color: var(--text-dark);
  font-weight: 700;
  line-height: 1.3;
}
.min-vh-80 { min-height: 80vh; }
.bg-light { background-color: var(--bg-light) !important; }

/* ---- 滚动进度条 ---- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  z-index: 9999;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0;
  transition: none;
}

/* ---- 页面加载动画 ---- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s, visibility 0.5s;
}
.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loader-content {
  text-align: center;
  color: #fff;
}
.loader-icon {
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 16px;
}
.loader-content p {
  font-size: 1.1rem;
  letter-spacing: 4px;
  color: rgba(255,255,255,0.7);
}

/* ---- 顶部信息栏 ---- */
.topbar {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.8);
  font-size: 0.82rem;
  padding: 8px 0;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar-left {
  display: flex;
  gap: 20px;
  align-items: center;
}
.topbar-left i {
  color: var(--accent);
  margin-right: 6px;
}
.topbar-right {
  display: flex;
  align-items: center;
}
.wechat-entry {
  position: relative;
}
.topbar-wechat-btn {
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.08);
  color: #fff;
  height: 34px;
  border-radius: 999px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.topbar-wechat-btn:hover {
  background: rgba(7,193,96,0.16);
  border-color: rgba(7,193,96,0.4);
  transform: translateY(-1px);
}
.topbar-wechat-btn i {
  color: #07c160;
}
.wechat-popover {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: 188px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 20;
}
.wechat-popover::before {
  content: '';
  position: absolute;
  top: -6px;
  right: 26px;
  width: 12px;
  height: 12px;
  background: #fff;
  transform: rotate(45deg);
}
.wechat-entry.open .wechat-popover,
.wechat-popover.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.wechat-popover img {
  width: 100%;
  border-radius: 12px;
  margin-bottom: 10px;
}
.wechat-popover p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-body);
  text-align: center;
}

/* ===================================
   导航栏
   =================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-body);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), background var(--transition);
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 20px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.3rem;
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
}
.logo-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
  align-items: center;
}
.nav-menu a {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dark);
  transition: all var(--transition);
  position: relative;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: rgba(var(--primary-rgb), 0.06);
}
.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* 导航 CTA 按钮 */
.nav-cta {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff !important;
  padding: 10px 22px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  flex-shrink: 0;
  transition: transform var(--transition), box-shadow var(--transition);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
  color: #fff !important;
}
.nav-cta i { color: var(--accent-light); }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}
/* 汉堡动画：X 形 */
.hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ===================================
   Hero 主视觉区
   =================================== */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary-dark) 50%, var(--primary) 100%);
  color: #fff;
  overflow: hidden;
  padding: 100px 0 60px;
}
.hero-overlay {
  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='0.03'%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");
  pointer-events: none;
}
.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.88rem;
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.5; }
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: #fff;
  margin-bottom: 20px;
  font-weight: 900;
  letter-spacing: -0.5px;
}
.hero h1 em {
  color: var(--accent);
  font-style: normal;
  position: relative;
}
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.9;
  margin-bottom: 32px;
  max-width: 560px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Hero 实拍图 */
.hero-visual {
  position: relative;
  max-width: 470px;
  margin-left: auto;
  padding-top: 24px;
}
.hero-photo-frame {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.28);
  border: 1px solid rgba(255,255,255,0.16);
}
.hero-photo-frame img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
}
.hero-photo-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7,22,40,0.04), rgba(7,22,40,0.28));
}
.hero-photo-chip {
  position: absolute;
  z-index: 2;
  background: rgba(7,22,40,0.78);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.82rem;
  line-height: 1.5;
}
.hero-photo-chip-top {
  top: 18px;
  left: 18px;
}
.hero-photo-chip-bottom {
  right: 18px;
  bottom: 18px;
  max-width: 210px;
}
.hero-mini-card {
  position: absolute;
  left: -28px;
  bottom: 26px;
  z-index: 3;
  width: 220px;
  background: rgba(255,255,255,0.96);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.hero-mini-card img {
  width: 100%;
  height: 110px;
  object-fit: cover;
}
.hero-mini-card div {
  padding: 14px;
}
.hero-mini-card strong {
  display: block;
  color: var(--text-dark);
  margin-bottom: 4px;
}
.hero-mini-card span {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* Hero 统计数据 */
.hero-stats {
  display: flex;
  gap: 0;
  margin-top: 60px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat-card {
  flex: 1;
  text-align: center;
  padding: 28px 16px;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.stat-card:last-child { border-right: none; }
.stat-number {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 4px;
}
.stat-label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.65);
}

/* ===================================
   通用组件
   =================================== */

/* 区域标题 */
.section { padding: 80px 0; }
.section-header { margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--text-dark);
  margin-bottom: 14px;
}
.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}
.text-start .section-desc { margin: 0; }
.section-divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 16px auto 0;
}
.text-start .section-divider { margin-left: 0; }

/* 按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-lg { padding: 14px 34px; font-size: 1rem; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
  color: #fff;
}
.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.3);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.4);
  color: #fff;
}
.btn-outline-light {
  border-color: rgba(255,255,255,0.4);
  color: #fff;
  background: transparent;
}
.btn-outline-light:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}
.btn-outline-primary {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
}

/* ===================================
   核心优势
   =================================== */
.features-strip {
  position: relative;
  z-index: 10;
  margin-top: -40px;
  padding-bottom: 0;
}
.feature-card {
  background: var(--bg-card);
  padding: 32px 24px;
  text-align: center;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--primary-rgb), 0.05));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
  color: var(--primary);
  transition: all var(--transition);
}
.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  transform: scale(1.1);
}
.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===================================
   产品分类卡片
   =================================== */
.product-category-card {
  display: block;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  height: 100%;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.product-category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.product-category-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  color: inherit;
}
.product-category-card:hover::before { transform: scaleX(1); }

.pcc-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 20px;
  transition: transform var(--transition);
}
.product-category-card:hover .pcc-icon { transform: scale(1.1) rotate(-5deg); }
.pcc-icon-medical { background: linear-gradient(135deg, #e91e63, #c2185b); }
.pcc-icon-special { background: linear-gradient(135deg, #9c27b0, #6a1b9a); }
.pcc-icon-equip   { background: linear-gradient(135deg, #607d8b, #455a64); }

.product-category-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}
.product-category-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}
.pcc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0 0 20px 0;
}
.pcc-tags li {
  padding: 4px 10px;
  background: var(--bg-light);
  border-radius: 20px;
  font-size: 0.76rem;
  color: var(--primary);
  font-weight: 500;
}
.pcc-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.pcc-link i {
  transition: transform var(--transition);
}
.product-category-card:hover .pcc-link i { transform: translateX(4px); }

/* ===================================
   关于我们预览
   =================================== */
.about-image-group {
  position: relative;
}
.about-img-main {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-img-placeholder {
  height: 400px;
  background: linear-gradient(135deg, var(--bg-light), #dde6f0);
  overflow: hidden;
}
.about-img-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-img-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  z-index: 2;
}
.badge-content {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 8px 30px rgba(var(--accent-rgb), 0.4);
}
.badge-number {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
}
.badge-number small { font-size: 1rem; }
.badge-text {
  font-size: 0.72rem;
  margin-top: 4px;
}

.about-text {
  font-size: 0.95rem;
  color: var(--text-body);
  margin-bottom: 16px;
  line-height: 1.85;
}
.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}
.highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
}
.highlight-item i {
  color: var(--accent);
  font-size: 1.1rem;
}

/* ===================================
   服务流程
   =================================== */
.process-timeline {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.process-step {
  flex: 1;
  min-width: 160px;
  max-width: 200px;
  text-align: center;
  position: relative;
  padding: 0 10px;
}
.step-number {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.step-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-card);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin: 0 auto 16px;
  position: relative;
  z-index: 2;
  transition: all var(--transition);
}
.process-step:hover .step-icon {
  background: var(--primary);
  color: #fff;
  transform: scale(1.1);
}
.process-step h4 {
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.process-step p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0;
}
.process-connector {
  width: 40px;
  height: 2px;
  background: var(--border-color);
  margin-top: 48px;
  flex-shrink: 0;
}

/* ===================================
   行业覆盖
   =================================== */
.industry-card {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
  height: 100%;
}
.industry-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.industry-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
}
.industry-card h4 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}
.industry-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===================================
   客户评价
   =================================== */
.testimonials-slider {
  overflow: hidden;
  position: relative;
}
.testimonials-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.testimonial-card {
  flex: 0 0 100%;
  max-width: 100%;
  padding: 0 20px;
}
@media (min-width: 768px) {
  .testimonial-card { flex: 0 0 50%; max-width: 50%; }
}
@media (min-width: 992px) {
  .testimonial-card { flex: 0 0 33.333%; max-width: 33.333%; }
}
.tc-stars {
  color: #ffc107;
  font-size: 0.9rem;
  margin-bottom: 16px;
}
.tc-content {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
  min-height: 100px;
}
.tc-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.tc-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
}
.tc-info strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-dark);
}
.tc-info span {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.testimonials-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
}
.ts-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-body);
  transition: all var(--transition);
}
.ts-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.ts-dots {
  display: flex;
  gap: 8px;
}
.ts-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-color);
  cursor: pointer;
  transition: all var(--transition);
}
.ts-dot.active {
  background: var(--primary);
  width: 24px;
  border-radius: 5px;
}

/* ===================================
   CTA 区域
   =================================== */
.cta-section {
  position: relative;
  padding: 80px 0;
  color: #fff;
  overflow: hidden;
}
.cta-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  z-index: 0;
}
.cta-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'%3E%3Cpath d='m0 40 40-40h-20l-40 40zm40 0v-20l-40 40z'/%3E%3C/g%3E%3C/svg%3E");
}
.cta-section h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  color: #fff;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 1.02rem;
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  margin: 0 auto 32px;
}
.cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================================
   页脚
   =================================== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
}
.footer-main { padding: 60px 0 40px; }
.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  margin: 16px 0;
  line-height: 1.8;
}
.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.5); }
.footer-brand .logo-icon {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
}
.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.footer-social a {
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #fff;
  padding: 10px 14px;
  font-size: 0.84rem;
  transition: background var(--transition), transform var(--transition);
}
.footer-social a:hover {
  background: rgba(7,193,96,0.2);
  transform: translateY(-1px);
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}
.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition), padding-left var(--transition);
}
.footer-links a:hover {
  color: var(--accent);
  padding-left: 6px;
}
.footer-contact {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.88rem;
}
.footer-contact i {
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
}
.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
  margin: 0;
}
.footer-bottom a {
  color: rgba(255,255,255,0.4);
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--accent); }

/* ===================================
   浮动操作按钮
   =================================== */
.floating-actions {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}
.float-item {
  position: relative;
}
.float-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}
.float-btn:hover { transform: scale(1.1); }
.float-btn-wechat { background: #07c160; }
.float-btn-phone  { background: var(--primary); text-decoration: none; }
.float-btn-top {
  background: var(--accent);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}
.float-btn-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 微信弹窗 */
.float-popup {
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  width: 180px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}
.float-item:hover .float-popup,
.float-popup.show {
  opacity: 1;
  visibility: visible;
}
.popup-arrow {
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  width: 12px;
  height: 12px;
  background: var(--bg-card);
  box-shadow: 2px -2px 4px rgba(0,0,0,0.05);
}
.qr-placeholder {
  width: 132px;
  height: 132px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--text-muted);
  margin: 0 auto 10px;
}
.qr-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}
.float-popup p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

/* ===================================
   面包屑导航
   =================================== */
.breadcrumb-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 60px 0 40px;
}
.breadcrumb-section h1 {
  color: #fff;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 8px;
}
.breadcrumb-section p {
  color: rgba(255,255,255,0.7);
  font-size: 0.95rem;
}
.breadcrumb-nav {
  margin-top: 16px;
}
.breadcrumb-nav a,
.breadcrumb-nav span {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}
.breadcrumb-nav a:hover { color: var(--accent); }
.breadcrumb-nav .separator {
  margin: 0 8px;
  color: rgba(255,255,255,0.3);
}
.breadcrumb-nav .current { color: var(--accent); }

/* ===================================
   产品详情页卡片
   =================================== */
.product-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all var(--transition);
  height: 100%;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.product-card-img {
  height: 180px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--text-muted);
  position: relative;
  overflow: hidden;
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.product-card:hover .product-card-img img {
  transform: scale(1.06);
}
.product-card-chip {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 1;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(7,22,40,0.78);
  color: #fff;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
}
.product-card-body {
  padding: 20px;
}
.product-card-body h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.product-card-body p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.7;
}
.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.product-specs span {
  font-size: 0.75rem;
  padding: 3px 8px;
  background: var(--bg-light);
  border-radius: 4px;
  color: var(--text-muted);
}

/* ===================================
   联系表单
   =================================== */
.contact-form {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-family: inherit;
  color: var(--text-dark);
  background: var(--bg-body);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
  outline: none;
}
textarea.form-control { min-height: 120px; resize: vertical; }
select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23718096' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ===================================
   FAQ 折叠面板
   =================================== */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-question {
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-dark);
  user-select: none;
}
.faq-arrow {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
}
.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 24px 18px;
}
.faq-answer p {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.8;
  margin: 0;
}

/* ===================================
   时间线（发展历程）
   =================================== */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}
.timeline-item {
  position: relative;
  padding-bottom: 32px;
}
.timeline-dot {
  position: absolute;
  left: -33px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-light);
  z-index: 2;
}
.timeline-item:hover .timeline-dot { background: var(--accent); }
.timeline-year {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.timeline-item h4 {
  font-size: 1rem;
  margin-bottom: 6px;
}
.timeline-item p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===================================
   资质证书
   =================================== */
.cert-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
}
.cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.cert-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(var(--primary-rgb), 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 1.5rem;
  color: var(--primary);
}
.cert-card h4 { font-size: 0.9rem; margin-bottom: 6px; }
.cert-card p { font-size: 0.78rem; color: var(--text-muted); margin: 0; }

/* ===================================
   安全知识卡片
   =================================== */
.safety-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  height: 100%;
}
.safety-card h3 {
  font-size: 1.05rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.safety-card ol, .safety-card ul {
  padding-left: 20px;
  margin: 0;
}
.safety-card li {
  font-size: 0.88rem;
  color: var(--text-body);
  margin-bottom: 8px;
  line-height: 1.7;
}

/* ===================================
   紧急处理卡片
   =================================== */
.emergency-card {
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 2px solid;
}
.emergency-card.danger {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  border-color: var(--accent);
}
.emergency-card.critical {
  background: linear-gradient(135deg, #fce4ec, #f8bbd0);
  border-color: #e91e63;
}

/* ===================================
   联系方式快捷卡片
   =================================== */
.quick-contact-card {
  display: block;
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}
.quick-contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  color: inherit;
}

/* ===================================
   配送覆盖卡片
   =================================== */
.delivery-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--primary);
  height: 100%;
}
.delivery-card.accent { border-top-color: var(--accent); }
.delivery-card.special { border-top-color: #9c27b0; }

/* ===================================
   Toast 提示
   =================================== */
.toast-msg {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text-dark);
  color: #fff;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 9000;
  display: flex;
  align-items: center;
  gap: 10px;
}
.toast-msg.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.toast-msg .toast-icon { color: #4ade80; }

/* ===================================
   404 页面
   =================================== */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 0;
}
.error-code {
  font-size: clamp(5rem, 15vw, 10rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

/* ===================================
   响应式断点
   =================================== */
@media (max-width: 1199px) {
  .process-connector { width: 20px; }
}
@media (max-width: 991px) {
  .nav-menu, .nav-cta { display: none; }
  .hamburger { display: flex; }
  /* 移动端菜单展开 */
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-body);
    box-shadow: var(--shadow-lg);
    padding: 12px 20px;
    z-index: 100;
    animation: slideDown 0.3s ease;
  }
  .nav-menu.open li { width: 100%; }
  .nav-menu.open a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }
  .about-img-badge { right: 10px; bottom: -10px; }
  .about-highlights { grid-template-columns: 1fr; }
  .process-timeline { flex-direction: column; align-items: center; }
  .process-connector {
    width: 2px;
    height: 30px;
    margin: 0;
  }
  .process-step { max-width: 300px; }
  .hero-stats { flex-wrap: wrap; }
  .stat-card { flex: 1 1 45%; }
  .stat-card:nth-child(2) { border-right: none; }
}
@media (max-width: 767px) {
  .topbar-left { gap: 12px; font-size: 0.76rem; }
  .hero { padding: 60px 0 40px; }
  .hero h1 { font-size: 1.8rem; }
  .hero .min-vh-80 { min-height: auto; }
  .hero-desc { font-size: 0.95rem; }
  .features-strip { margin-top: -20px; }
  .section { padding: 50px 0; }
  .contact-form { padding: 24px; }
  .floating-actions { bottom: 16px; right: 16px; }
  .float-btn { width: 44px; height: 44px; font-size: 1rem; }
  .hero-mini-card {
    left: 12px;
    bottom: 12px;
    width: 180px;
  }
  .topbar-wechat-btn span { display: none; }
  .product-card-img img { height: 180px; }
  .about-img-placeholder { height: 260px; min-height: auto !important; }
}
@media (max-width: 575px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .cta-actions { flex-direction: column; align-items: center; }
  .stat-card { flex: 1 1 100%; border-right: none; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}

/* 菜单展开动画 */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- 滚动动画覆盖（AOS 初始状态防抖） ---- */
[data-aos] { transition-duration: 0.8s; }