/* ========================================
   首页样式
   专业 B2B 门户设计 - Glassmorphism + 信任感
   ======================================== */

/* ========================================
   Banner 搜索区 - Hero Section
   ======================================== */
.banner {
  position: relative;
  background: linear-gradient(135deg, #2563EB 0%, #1E40AF 100%);
  padding: var(--space-20) 0 var(--space-16);
  overflow: hidden;
}

/* 装饰性背景图案 */
.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.banner .container {
  position: relative;
  z-index: 1;
  text-align: center;
}

.banner h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.banner-desc {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-10);
  font-weight: 300;
}

/* 搜索框 */
.searchbox {
  display: flex;
  gap: var(--space-3);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-2);
  box-shadow: var(--shadow-xl);
  max-width: 700px;
  margin: 0 auto var(--space-6);
}

.searchbox .key {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
  font-family: var(--font-body);
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  outline: none;
}

.searchbox .key::placeholder {
  color: var(--color-text-tertiary);
}

.searchbox .submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-xl);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base) ease;
  white-space: nowrap;
  min-height: 48px;
}

.searchbox .submit:hover {
  background-color: #EA580C;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.searchbox .submit:focus-visible {
  outline: 2px solid var(--color-text-inverse);
  outline-offset: 2px;
}

/* 优质供应商 */
.hotcity {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-sm);
  font-weight: 600;
}

.hotcity a {
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  transition: all var(--transition-base) ease;
}

.hotcity a:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ========================================
   轮播广告区
   ======================================== */
.slider-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-primary);
}

.slider-3d {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  height: 185px;
}

.slider-3d-container {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 1200px;
  overflow: visible;
}

.slider-3d-item {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 420px;
  height: 185px;
  transform-style: preserve-3d;
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.slider-3d-item a {
  display: block;
}

.slider-3d-item img {
  width: 420px;
  height: 185px;
  display: block;
  object-fit: cover;
  background-color: var(--color-bg-secondary);
}

.slider-3d-prev,
.slider-3d-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-size: var(--text-xl);
  cursor: pointer;
  transition: all var(--transition-base) ease;
  box-shadow: var(--shadow-md);
}

.slider-3d-prev:hover,
.slider-3d-next:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-50%) scale(1.1);
}

.slider-3d-prev {
  left: var(--space-4);
}

.slider-3d-next {
  right: var(--space-4);
}

.slider-3d-indicators {
  position: absolute;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: var(--space-2);
}

.slider-3d-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all var(--transition-base) ease;
}

.slider-3d-dot.active {
  background: white;
  width: 32px;
}

@media (max-width: 767px) {
  .slider-3d {
    height: 185px;
  }
  
  .slider-3d-item {
    width: 90%;
    max-width: 420px;
    height: 185px;
  }
  
  .slider-3d-item img {
    width: 100%;
    height: 185px;
  }
  
  .slider-3d-prev,
  .slider-3d-next {
    width: 36px;
    height: 36px;
    font-size: var(--text-base);
  }
}

/* 轮播控制按钮 */
.slider-3d-prev,
.slider-3d-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: var(--text-xl);
  cursor: pointer;
  transition: all var(--transition-base) ease;
  z-index: 10;
}

.slider-3d-prev {
  left: var(--space-4);
}

.slider-3d-next {
  right: var(--space-4);
}

.slider-3d-prev:hover,
.slider-3d-next:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-50%) scale(1.1);
}

.slider-3d-prev:focus-visible,
.slider-3d-next:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 轮播指示器 */
.slider-3d-indicators {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-2);
  z-index: 10;
}

.slider-3d-indicators .slider-3d-dot,
.slider-3d-indicators span {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base) ease;
  display: inline-block;
}

.slider-3d-indicators .slider-3d-dot.active,
.slider-3d-indicators span.active {
  width: 32px;
  background-color: var(--color-text-inverse);
}

/* ========================================
   横幅广告
   ======================================== */
.ad-banner {
  padding: var(--space-8) 0;
}

.ad-banner img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base) ease;
}

.ad-banner a:hover img {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* ========================================
   区块标题
   ======================================== */
/* 区块标题 - 品牌企业（居中） */
.brand-companies .section-title {
  text-align: center;
  margin-bottom: var(--space-12);
}

.brand-companies .section-title h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: center;
}

.brand-companies .section-title h2 .fa {
  color: var(--color-primary);
}

.brand-companies .section-title p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* 区块标题 - 分类企业（左右布局） */
.category-section .section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.category-section .section-title h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.category-section .section-title .more-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: all var(--transition-base) ease;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  white-space: nowrap;
}

.category-section .section-title .more-link:hover {
  background-color: rgba(37, 99, 235, 0.1);
  transform: translateX(4px);
}

/* 区块标题 - 新闻资讯（居中） */
.news-section .section-title {
  text-align: center;
  margin-bottom: var(--space-12);
}

.news-section .section-title h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.news-section .section-title p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ========================================
   品牌企业区
   ======================================== */
.brand-companies {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-secondary);
}

.company-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .company-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .company-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .company-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.company-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base) ease;
  cursor: pointer;
}

.company-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.company-img {
  position: relative;
  aspect-ratio: 4 / 3;
  background-color: var(--color-bg-secondary);
  overflow: hidden;
}

.company-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-4);
  transition: transform var(--transition-base) ease;
}

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

.badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.company-info {
  padding: var(--space-5);
}

.company-info h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.company-info h3 a {
  color: var(--color-text-primary);
  transition: color var(--transition-base) ease;
}

.company-info h3 a:hover {
  color: var(--color-primary);
}

.company-detail {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.company-detail .fa {
  color: var(--color-primary);
  width: 16px;
  flex-shrink: 0;
}

.company-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
}

.tag .fa {
  font-size: 10px;
}

/* ========================================
   分类企业区
   ======================================== */
.category-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-primary);
}

.category-banner {
  margin-bottom: var(--space-8);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.category-banner img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-base) ease;
}

.category-banner a:hover img {
  transform: scale(1.02);
}

.company-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .company-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .company-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.company-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: all var(--transition-base) ease;
}

.company-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.item-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.item-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-3);
}

.item-info {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.item-info h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 0;
  line-height: 1.4;
}

.item-info h3 a {
  color: var(--color-text-primary);
  transition: color var(--transition-base) ease;
}

.item-info h3 a:hover {
  color: var(--color-primary);
}

.item-info p {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.5;
  text-align: left;
}

.item-info .fa {
  color: var(--color-primary);
  width: 16px;
  flex-shrink: 0;
  font-size: var(--text-base);
}

.item-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-top: var(--space-3);
  width: 100%;
}

.btn-view,
.btn-website {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-base) ease;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-view {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-primary);
}

.btn-view:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-view:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-website {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-website:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-website:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   新闻资讯区
   ======================================== */
.news-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-secondary);
}

.news-tabs {
  max-width: 1200px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base) ease;
  min-height: 44px;
}

.tab-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.tab-btn.active {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.tab-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn var(--transition-base) ease;
}

.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .news-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.news-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base) ease;
  cursor: pointer;
}

.news-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.news-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

.news-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base) ease;
}

.news-card:hover .news-img img {
  transform: scale(1.1);
}

.news-info {
  padding: var(--space-5);
}

.news-info h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.news-info h3 a {
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-info h3 a:hover {
  color: var(--color-primary);
}

.news-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.news-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.news-meta .fa {
  color: var(--color-primary);
}

.section-more {
  text-align: center;
  margin-top: var(--space-12);
}

.more-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base) ease;
  min-height: 48px;
}

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

/* ========================================
   响应式优化
   ======================================== */
@media (max-width: 639px) {
  .banner {
    padding: var(--space-12) 0 var(--space-10);
  }
  
  .banner h1 {
    font-size: var(--text-3xl);
  }
  
  .banner-desc {
    font-size: var(--text-base);
  }
  
  .search-box form {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .search-btn {
    width: 100%;
    justify-content: center;
  }
  
  .slider-3d-container {
    aspect-ratio: 16 / 9;
  }
  
  .company-item {
    flex-direction: column;
  }
  
  .item-img {
    width: 100%;
    height: 160px;
  }
  
  .slider-3d-prev,
  .slider-3d-next {
    width: 40px;
    height: 40px;
  }
  
  .brand-companies .section-title h2 {
    font-size: var(--text-2xl);
  }
  
  .news-section .section-title h2 {
    font-size: var(--text-2xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  .slider-3d-item.active {
    animation: none;
  }
  
  .tab-content.active {
    animation: none;
  }
}