/* ========================================
   科洛德胶带 (Cloudplast) - 企业官网样式
   纯中文SEO优化网站
   ======================================== */

/* CSS变量定义 - 便于主题管理 */
:root {
  --primary-color: #1a56db;      /* 科洛德蓝 */
  --primary-dark: #0d3aa9;
  --secondary-color: #f97316;    /* 活力橙 */
  --success-color: #16a34a;      /* 成功绿 */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
}

/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* 通用容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========================================
   导航栏
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 18px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-cn {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1.2;
}

.logo-en {
  font-size: 12px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 0;
  position: relative;
  transition: var(--transition);
}

.nav a:hover,
.nav a.active {
  color: var(--primary-color);
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--primary-color);
  color: white !important;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: var(--transition) !important;
}

.header-cta::after {
  display: none !important;
}

.header-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ========================================
   Hero区域
   ======================================== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #60a5fa 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 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='0.05'%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");
  opacity: 1;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-text h1 span {
  color: #fbbf24;
}

.hero-text p {
  font-size: 18px;
  opacity: 0.95;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  border-radius: 50px;
  font-size: 14px;
  border: 1px solid rgba(255,255,255,0.2);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: white;
  color: var(--primary-color);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.5);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
}

.hero-image {
  position: relative;
}

.hero-image-main {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px rgba(0,0,0,0.25);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.15);
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  color: #fbbf24;
  display: block;
}

.stat-label {
  font-size: 14px;
  opacity: 0.9;
  margin-top: 4px;
}

/* ========================================
   Section通用样式
   ======================================== */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: #eff6ff;
  color: var(--primary-color);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

.bg-gray {
  background: var(--bg-secondary);
}

/* ========================================
   产品卡片
   ======================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.product-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.product-card-image {
  height: 220px;
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.product-card:hover .product-card-image img {
  transform: scale(1.05);
}

.product-card-body {
  padding: 24px;
}

.product-card-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.product-card-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 50px;
  font-size: 13px;
}

/* ========================================
   特色优势
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
}

.feature-card {
  padding: 32px;
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   应用场景
   ======================================== */
.applications-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.application-item {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: white;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.application-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.app-icon {
  width: 48px;
  height: 48px;
  background: #eff6ff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.app-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.app-content p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ========================================
   地域服务网络
   ======================================== */
.regions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.region-card {
  padding: 20px;
  background: white;
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.region-card:hover {
  border-color: var(--primary-color);
  background: #eff6ff;
}

.region-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 6px;
}

.region-desc {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ========================================
   CTA行动召唤区
   ======================================== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  color: white;
  text-align: center;
}

.cta-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 18px;
  opacity: 0.95;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand .logo-cn {
  color: white;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 14px;
}

.footer-column h4 {
  color: white;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 12px;
}

.footer-column a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-column a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  text-align: center;
  font-size: 14px;
}

/* ========================================
   页面Banner
   ======================================== */
.page-banner {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  color: white;
  text-align: center;
}

.page-banner h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
}

.page-banner p {
  font-size: 17px;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
  font-size: 14px;
  opacity: 0.85;
}

.breadcrumb a {
  color: white;
  text-decoration: none;
}

/* ========================================
   内容页面样式
   ======================================== */
.content-page {
  padding: 60px 0;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.main-content {
  background: white;
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.sidebar {
  position: sticky;
  top: 90px;
  height: fit-content;
}

.sidebar-widget {
  background: white;
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}

.sidebar-widget h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-color);
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget li {
  margin-bottom: 10px;
}

.sidebar-widget a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.sidebar-widget a:hover {
  color: var(--primary-color);
}

/* 文章内容样式 */
.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.8;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

.article-content th,
.article-content td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border-color);
}

.article-content th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

.highlight-box {
  background: #eff6ff;
  border-left: 4px solid var(--primary-color);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.warning-box {
  background: #fef3c7;
  border-left: 4px solid #f59e0b;
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ========================================
   联系表单
   ======================================== */
.contact-form {
  display: grid;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 34px;
  }

  .hero-badges {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-image {
    max-width: 500px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    gap: 0;
  }

  .nav.active {
    display: flex;
  }

  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .stat-number {
    font-size: 24px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-text h1 {
    font-size: 24px;
  }

  .hero-text p {
    font-size: 15px;
  }

  .btn {
    padding: 12px 20px;
    font-size: 14px;
  }

  .page-banner h1 {
    font-size: 28px;
  }
}

/* ========================================
   图片优化样式
   ======================================== */

/* 产品展示图片优化 */
.article-content img,
.main-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Hero区域产品图 */
.hero-image img {
  transition: transform 0.3s ease;
}

.hero-image:hover img {
  transform: scale(1.02);
}

/* 应用场景图标图片 */
.application-item img {
  flex-shrink: 0;
}

/* 响应式图片 */
@media (max-width: 768px) {
  .article-content img {
    border-radius: var(--radius-md);
  }
}