/* ========================================
   云星桥架企业官网 - 全站样式
   广州云俊星永裕电缆桥架有限公司
   ======================================== */

/* CSS变量 - 现代升级版 */
:root {
  --primary: #0f2557;
  --primary-dark: #071838;
  --primary-light: #1e3d7a;
  --accent: #ff6b35;
  --accent-dark: #e55a2a;
  --accent-light: #ff8c5a;
  --text-dark: #1a1a2e;
  --text-gray: #4a5568;
  --text-light: #718096;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(15,37,87,0.08);
  --shadow-lg: 0 12px 48px rgba(15,37,87,0.12);
  --shadow-xl: 0 20px 60px rgba(15,37,87,0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Microsoft YaHei', '微软雅黑', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  color: var(--text-dark);
  line-height: 1.7;
  background: #fff;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; outline: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section { padding: 80px 0; }
.bg-light { background: var(--bg-light); }
.bg-blue { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); }

/* ======== 按钮 - 现代升级 ======== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}
.btn:hover::before { transform: translateX(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(255,107,53,0.3);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(255,107,53,0.45);
}
.btn-outline {
  border: 2px solid rgba(255,255,255,0.6);
  color: #fff;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(10px);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.2);
  border-color: #fff;
  transform: translateY(-2px);
}
.btn-sm {
  padding: 9px 20px;
  font-size: 13px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(15,37,87,0.2);
}
.btn-sm:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(15,37,87,0.3);
}

/* ======== 区域标题 ======== */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-header h2 {
  font-size: 32px;
  color: var(--primary-dark);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--accent);
  margin: 10px auto 0;
  border-radius: 2px;
}
.section-header p {
  color: var(--text-gray);
  font-size: 16px;
}
.section-header.left { text-align: left; }
.section-header.left h2::after { margin-left: 0; }
.section-header.light h2 { color: #fff; }
.section-header.light p { color: rgba(255,255,255,0.8); }

.section-footer {
  text-align: center;
  margin-top: 40px;
}

/* ======== 顶部信息栏 ======== */
.top-bar {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.85);
  padding: 8px 0;
  font-size: 13px;
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-bar-left, .top-bar-right {
  display: flex;
  gap: 20px;
}
.top-bar span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.top-bar i { color: var(--accent); font-size: 12px; }

/* ======== 导航栏 - 现代升级 ======== */
.header {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0;
  transition: var(--transition);
}
.header.scrolled {
  box-shadow: 0 8px 40px rgba(0,0,0,0.1);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}
.logo img {
  height: 52px;
  width: auto;
  object-fit: contain;
}
.logo-text, .logo-text-always {
  display: flex;
  flex-direction: column;
}
.logo-text { display: none; }
.logo-text-always { display: flex; }
.logo-brand {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.logo-sub {
  font-size: 11px;
  color: var(--text-gray);
  line-height: 1.3;
}
.nav ul {
  display: flex;
  gap: 8px;
}
.nav ul li a {
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dark);
  transition: var(--transition);
  position: relative;
  background: transparent;
}
.nav ul li a::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  opacity: 0;
  transform: scale(0.95);
  transition: var(--transition);
}
.nav ul li a:hover::before,
.nav ul li a.active::before {
  opacity: 1;
  transform: scale(1);
}
.nav ul li a span {
  position: relative;
  z-index: 1;
}
.nav ul li a:hover span,
.nav ul li a.active span {
  color: #fff;
}
.menu-toggle { display: none; font-size: 24px; color: var(--primary); }

/* ======== 图片优化：高质量在线图片兜底 ======== */
/* 为所有产品图片添加更智能的加载方式 */
.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.product-img img[onerror] {
  transition: all 0.3s ease;
}

/* 为产品展示主图添加高质量在线图片 */
.product-intro-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 为案例图片优化 */
.case-img {
  width: 100%;
  height: 280px;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.case-img:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 为工厂图片优化 */
.factory-img {
  width: 100%;
  height: 320px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.factory-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 为材料卡片图片优化 */
.material-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
}

/* ======== 英雄横幅 - 现代升级 ======== */
.hero {
  position: relative;
  height: 700px;
  overflow: hidden;
}
.hero-slides { width: 100%; height: 100%; position: relative; }
.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-color: var(--primary-dark);
  opacity: 0;
  transition: opacity 1s ease, transform 1s ease;
  transform: scale(1.05);
}
.hero-slide.active { opacity: 1; transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(7,24,56,0.88) 0%, rgba(15,37,87,0.75) 50%, rgba(30,61,122,0.65) 100%);
}
/* 为hero-slide添加在线高质量图片作为备用 */
.hero-slide:nth-child(1) {
  background-image: url('https://images.unsplash.com/photo-1587293852726-70cdb56c2866?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80'), url('images/hero-1.png'), linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}
.hero-slide:nth-child(2) {
  background-image: url('https://images.unsplash.com/photo-1565043686747-69f6646db940?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80'), url('images/hero-2.png'), linear-gradient(135deg, #1a3a6e 0%, #2a5b8f 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  padding-top: 140px;
  color: #fff;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 1px;
  box-shadow: 0 4px 16px rgba(255,107,53,0.4);
  animation: floatBadge 3s ease-in-out infinite;
}
@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.hero-content h1 {
  font-size: 56px;
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.15;
  text-shadow: 0 4px 20px rgba(0,0,0,0.4);
  letter-spacing: -0.5px;
}
.hero-content > p {
  font-size: 19px;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 600px;
}
.hero-btns {
  display: flex;
  gap: 18px;
  margin-bottom: 60px;
}
.hero-stats {
  display: flex;
  gap: 60px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.05);
  padding: 24px 40px;
  border-radius: var(--radius-lg);
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 42px;
  font-weight: 900;
  background: linear-gradient(135deg, #ffd700, #ffaa00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  opacity: 0.75;
  margin-top: 6px;
}
.hero-nav {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 10;
}
.hero-prev, .hero-next {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  color: #fff;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.3);
}
.hero-prev:hover, .hero-next:hover { background: rgba(255,255,255,0.4); }
.hero-dots { display: flex; gap: 8px; }
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.dot.active { background: var(--accent); width: 24px; border-radius: 4px; }

/* ======== 特色优势 ======== */
.features {
  background: var(--primary);
  padding: 0;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.feature-item {
  padding: 32px 28px;
  text-align: center;
  color: #fff;
  border-right: 1px solid rgba(255,255,255,0.15);
  transition: var(--transition);
}
.feature-item:last-child { border-right: none; }
.feature-item:hover { background: rgba(255,255,255,0.1); }
.feature-icon {
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 22px;
  color: var(--accent);
}
.feature-item h3 { font-size: 16px; margin-bottom: 8px; }
.feature-item p { font-size: 13px; opacity: 0.8; }

/* ======== 产品展示 - 玻璃拟态升级 ======== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-card {
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.8);
}
.product-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(255,107,53,0.3);
}
.product-img {
  position: relative;
  height: 240px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-light), #e8edf5);
}
.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.product-card:hover .product-img img { transform: scale(1.1); }
/* 为产品图片添加高质量在线图片备用 */
.product-img img[src="images/tray-1.jpg"],
.product-img img[src="images/tray-2.jpg"],
.product-img img[src="images/tray-3.jpg"] {
  content: url('https://images.unsplash.com/photo-1504917595217-d4dc5ebe6122?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-img img[src="images/ladder-1.jpg"],
.product-img img[src="images/ladder-2.jpg"] {
  content: url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-img img[src="images/slot-1.jpg"],
.product-img img[src="images/slot-2.jpg"] {
  content: url('https://images.unsplash.com/photo-1565514020176-97d6d95c1a86?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-img img[src="images/grid-1.jpg"] {
  content: url('https://images.unsplash.com/photo-1563770095-39d468f95c55?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-img img[src="images/fireproof-1.jpg"] {
  content: url('https://images.unsplash.com/photo-1504307651254-35680f356dfd?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-img img[src="images/composite-1.jpg"] {
  content: url('https://images.unsplash.com/photo-1581092921461-eab62e97a782?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
/* 为案例图片添加高质量在线图片备用 */
.case-img img[src*="case-"] {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.case-img img[src="images/case-1.jpg"] {
  content: url('https://images.unsplash.com/photo-1504389557843-ad7e2c1cb9d9?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80');
}
.case-img img[src="images/case-2.jpg"] {
  content: url('https://images.unsplash.com/photo-1565043686747-69f6646db940?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80');
}
.case-img img[src="images/case-3.jpg"] {
  content: url('https://images.unsplash.com/photo-1519494026892-80bbd2d6fd0d?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80');
}
.case-img img[src="images/case-4.jpg"] {
  content: url('https://images.unsplash.com/photo-1497366216548-37526070297c?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80');
}
/* 为工厂图片添加高质量在线图片备用 */
.factory-img img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.factory-img img[src*="factory-"] {
  content: url('https://images.unsplash.com/photo-1581091226825-a6a2a5aee158?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
}
/* 为材料卡片图片添加高质量在线图片备用 */
.material-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.material-card img[src*="material-"] {
  content: url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80');
}
.product-tag {
  position: absolute;
  top: 14px;
  right: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  padding: 5px 12px;
  border-radius: 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(255,107,53,0.4);
}
.product-info { padding: 24px; }
.product-info h3 {
  font-size: 19px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
  font-weight: 700;
}
.product-info p {
  font-size: 14px;
  color: var(--text-gray);
  margin-bottom: 14px;
  line-height: 1.7;
}
.product-specs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.product-specs span {
  background: linear-gradient(135deg, var(--bg-light), #e8edf5);
  padding: 5px 12px;
  border-radius: 14px;
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  border: 1px solid rgba(15,37,87,0.08);
}

/* ======== 为什么选择我们 ======== */
.why-us-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.why-us-img {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 460px;
}
.why-us-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.why-us-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  background: var(--accent);
  color: #fff;
  padding: 16px 20px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: 0 4px 16px rgba(232,160,32,0.4);
}
.badge-num {
  display: block;
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
}
.badge-text { font-size: 13px; }
.why-list { margin: 28px 0; }
.why-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.why-item:last-child { border-bottom: none; margin-bottom: 0; }
.why-icon { color: var(--accent); font-size: 22px; flex-shrink: 0; padding-top: 2px; }
.why-text h4 { font-size: 16px; color: var(--primary-dark); margin-bottom: 4px; }
.why-text p { font-size: 14px; color: var(--text-gray); }

/* ======== 材质处理 ======== */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.material-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 2px solid transparent;
  transition: var(--transition);
}
.material-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}
.material-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 24px;
  color: #fff;
}
.material-card h3 { font-size: 18px; color: var(--primary-dark); margin-bottom: 8px; }
.material-card p { font-size: 13px; color: var(--text-gray); }

/* ======== 案例展示 ======== */
.cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 200px 200px;
  gap: 16px;
}
.case-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--primary);
  cursor: pointer;
}
.case-item.large {
  grid-row: span 2;
}
.case-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.case-item:hover img { transform: scale(1.08); }
.case-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(13,58,110,0.9));
  padding: 20px 16px 14px;
  color: #fff;
  transform: translateY(20px);
  transition: var(--transition);
}
.case-item:hover .case-info { transform: translateY(0); }
.case-info h3 { font-size: 16px; margin-bottom: 4px; }
.case-info p { font-size: 12px; opacity: 0.8; }

/* ======== 客户评价 ======== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: #fff;
  transition: var(--transition);
}
.testimonial-card:hover {
  background: rgba(255,255,255,0.15);
  transform: translateY(-4px);
}
.testimonial-stars {
  color: var(--accent);
  margin-bottom: 16px;
  font-size: 14px;
}
.testimonial-card > p {
  font-size: 14px;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 20px;
}
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.author-avatar { font-size: 36px; color: rgba(255,255,255,0.5); }
.author-info strong { display: block; font-size: 15px; }
.author-info span { font-size: 12px; opacity: 0.7; }

/* ======== CTA 联系区域 ======== */
.cta-section {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  padding: 60px 0;
}
.cta-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.cta-text h2 { font-size: 32px; color: #fff; margin-bottom: 12px; }
.cta-text p { color: rgba(255,255,255,0.85); font-size: 16px; }
.quick-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.quick-form input {
  background: rgba(255,255,255,0.95);
  border: none;
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-dark);
}
.quick-form input::placeholder { color: #aaa; }
.quick-form button {
  grid-column: span 2;
  background: var(--primary-dark);
  padding: 14px;
  font-size: 16px;
}
.quick-form button:hover { background: var(--primary); }

/* ======== 页脚 ======== */
.footer {
  background: #0d1b2e;
  color: rgba(255,255,255,0.75);
  padding-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { height: 40px; }
.footer-logo span { font-size: 20px; font-weight: 700; color: #fff; }
.footer-desc { font-size: 13px; line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--accent); }
.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { font-size: 13px; transition: var(--transition); }
.footer-col ul a:hover { color: var(--accent); padding-left: 4px; }
.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
}
.contact-list i { color: var(--accent); width: 16px; flex-shrink: 0; margin-top: 3px; }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  opacity: 0.6;
}
.footer-bottom a:hover { color: var(--accent); }

/* ======== 返回顶部 ======== */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--accent); }

/* ======== 悬浮联系按钮 ======== */
.float-contact {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  z-index: 999;
}
.float-btn {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--primary);
  color: #fff;
  padding: 14px 14px;
  font-size: 20px;
  border-radius: 4px 0 0 4px;
  margin-bottom: 2px;
  overflow: hidden;
  max-width: 48px;
  transition: max-width 0.3s ease, background 0.3s;
  white-space: nowrap;
}
.float-btn:hover {
  max-width: 140px;
  background: var(--accent);
}
.float-btn span {
  font-size: 13px;
  margin-left: 8px;
  opacity: 0;
  transition: opacity 0.3s;
}
.float-btn:hover span { opacity: 1; }
.float-btn.wechat { background: #07c160; }
.float-btn.wechat:hover { background: #06ad56; }

/* ======== 产品页面 ======== */
.page-banner {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  color: #fff;
  padding: 60px 0 50px;
  text-align: center;
}
.page-banner h1 { font-size: 36px; margin-bottom: 12px; }
.page-banner p { font-size: 16px; opacity: 0.85; }
.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  opacity: 0.75;
  margin-top: 12px;
}
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { opacity: 0.5; }

/* 产品分类标签 */
.product-tabs {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0;
  position: sticky;
  top: 70px;
  z-index: 100;
}
.product-tabs .container {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 12px 20px;
}
.tab-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-gray);
  background: var(--bg-light);
  white-space: nowrap;
  transition: var(--transition);
}
.tab-btn:hover, .tab-btn.active {
  background: var(--primary);
  color: #fff;
}

/* 产品详细列表 */
.product-section { padding: 60px 0; }
.product-section + .product-section { padding-top: 0; }
.product-section-title {
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 30px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.product-section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent);
  border-radius: 2px;
}
.products-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ======== 关于我们页面 ======== */
.about-intro {
  padding: 80px 0;
}
.about-intro-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text h2 {
  font-size: 30px;
  color: var(--primary-dark);
  margin-bottom: 20px;
}
.about-text p {
  color: var(--text-gray);
  margin-bottom: 16px;
  line-height: 1.9;
}
.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.highlight-item {
  background: var(--bg-light);
  padding: 16px;
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}
.highlight-item strong {
  display: block;
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 4px;
}
.highlight-item span { font-size: 13px; color: var(--text-gray); }
.about-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 420px;
}
.about-img img { width: 100%; height: 100%; object-fit: cover; }

/* 工厂图片展示 */
.workshop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.workshop-item {
  border-radius: var(--radius);
  overflow: hidden;
  height: 220px;
}
.workshop-item img { width: 100%; height: 100%; object-fit: cover; }

/* 资质证书 */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.cert-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.cert-item img {
  width: 100%;
  height: 160px;
  object-fit: contain;
  margin-bottom: 12px;
}
.cert-item p { font-size: 13px; color: var(--text-gray); }

/* ======== 联系我们页面 ======== */
.contact-section {
  padding: 80px 0;
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
}
.contact-info h3 {
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 24px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 20px; }
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-info-icon {
  width: 44px; height: 44px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
}
.contact-info-item h4 { font-size: 15px; color: var(--primary-dark); margin-bottom: 4px; }
.contact-info-item p { font-size: 14px; color: var(--text-gray); }
.contact-form { background: #fff; padding: 36px; border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.contact-form h3 { font-size: 22px; color: var(--primary-dark); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; color: var(--text-dark); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  transition: var(--transition);
  background: var(--bg-light);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(26,75,140,0.1);
}
.form-group textarea { height: 120px; resize: vertical; }
.map-section { padding: 0 0 80px; }
.map-placeholder {
  height: 400px;
  background: linear-gradient(135deg, #e8edf5, #d0daea);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 16px;
  text-align: center;
}

/* ======== 响应式设计 ======== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .materials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .certs-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .top-bar { display: none; }
  .menu-toggle { display: block; }
  .nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    padding: 16px;
  }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; }
  .nav ul li a { display: block; padding: 12px 16px; }
  .hero { height: 480px; }
  .hero-content h1 { font-size: 30px; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 24px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.15); }
  .products-grid { grid-template-columns: 1fr; }
  .why-us-inner { grid-template-columns: 1fr; }
  .why-us-img { height: 280px; }
  .materials-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
  .case-item.large { grid-row: auto; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .cta-inner { grid-template-columns: 1fr; }
  .quick-form { grid-template-columns: 1fr; }
  .quick-form button { grid-column: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .float-contact { display: none; }
  .section-header h2 { font-size: 26px; }
  .section { padding: 50px 0; }
  .contact-inner { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: repeat(2, 1fr); }
  .workshop-grid { grid-template-columns: repeat(2, 1fr); }
  .about-intro-inner { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 24px; }
  .hero-btns { flex-direction: column; }
  .hero-stats { display: none; }
  .materials-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr; }
  .about-highlights { grid-template-columns: 1fr; }
}

/* ======== 页面加载动画 - 增强版 ======== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
/* 从左淡入 */
.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}
/* 从右淡入 */
.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}
/* 放大淡入 */
.fade-in-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* 通知提示 - 现代升级 */
.toast {
  position: fixed;
  top: 100px;
  right: 24px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  color: var(--text-dark);
  padding: 16px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateX(120%);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255,255,255,0.8);
}
.toast.show { transform: translateX(0); }
.toast.success {
  border-left: 4px solid #10b981;
  color: #059669;
}
.toast.success i { color: #10b981; font-size: 18px; }

/* ======== 额外：数字计数动画 ======== */
.counter-num {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* ======== 额外：品牌故事板块 ======== */
.brand-story {
  background: linear-gradient(135deg, #0f2557 0%, #1e3d7a 100%);
  color: #fff;
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}
.brand-story::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(255,107,53,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.brand-story::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,215,0,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.brand-story-inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  padding: 0 20px;
}
.brand-story-badge {
  display: inline-block;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  color: #ffd700;
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.brand-story h2 {
  font-size: 42px;
  font-weight: 900;
  margin-bottom: 24px;
  line-height: 1.3;
}
.brand-story h2 span {
  color: var(--accent);
}
.brand-story p {
  font-size: 18px;
  line-height: 1.9;
  opacity: 0.9;
  margin-bottom: 32px;
}
.brand-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}
.brand-stat-item {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  transition: var(--transition);
}
.brand-stat-item:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
}
.brand-stat-num {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, #ffd700, #ffaa00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.brand-stat-label {
  font-size: 14px;
  opacity: 0.8;
}