/* 科技职业咨询 - 产品规格风格样式表 */
/* 主色调: #607d8b - 蓝灰色 */

/* ===== CSS 变量 ===== */
:root {
  --accent-color: #607d8b;
  --accent-dark: #455a64;
  --accent-light: #90a4ae;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7f8;
  --bg-tertiary: #eceff1;
  --text-primary: #263238;
  --text-secondary: #546e7a;
  --text-muted: #78909c;
  --border-color: #cfd8dc;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

/* ===== 重置与基础 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-dark);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===== 布局容器 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 页头 ===== */
.header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.logo span {
  color: var(--text-primary);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.search-box {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  gap: 8px;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  font-size: 0.9rem;
  width: 180px;
  color: var(--text-primary);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background-color: var(--bg-tertiary);
  padding: 12px 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-color);
}

.breadcrumb .separator {
  margin: 0 8px;
  color: var(--text-muted);
}

.breadcrumb .current {
  color: var(--text-primary);
}

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 区块标题 ===== */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.view-all {
  font-size: 0.875rem;
  color: var(--accent-color);
}

/* ===== 卡片组件 ===== */
.card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-body {
  padding: 24px;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.card-footer {
  padding: 16px 24px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ===== 规格卡片（首页特色） ===== */
.featured-specs {
  padding: 60px 0;
  background-color: var(--bg-primary);
}

.spec-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  transition: all 0.2s ease;
}

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

.spec-card .icon {
  width: 64px;
  height: 64px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.75rem;
  color: var(--accent-color);
}

.spec-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.spec-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.spec-card .cta-link {
  color: var(--accent-color);
  font-weight: 500;
  font-size: 0.9rem;
}

/* ===== 分类网格 ===== */
.categories-section {
  padding: 60px 0;
  background-color: var(--bg-secondary);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.category-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all 0.2s ease;
}

.category-item:hover {
  border-color: var(--accent-color);
  background-color: var(--bg-primary);
}

.category-item .icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.category-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.category-item span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== 内容列表 ===== */
.content-section {
  padding: 60px 0;
}

.content-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.content-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.content-item:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow-sm);
}

.content-item-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.content-item-info .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.content-item .tag {
  background-color: var(--bg-tertiary);
  color: var(--accent-color);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* ===== 规格表格 ===== */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spec-table th,
.spec-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.spec-table th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.spec-table td {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.spec-table tr:hover td {
  background-color: var(--bg-secondary);
}

.spec-table .spec-label {
  font-weight: 500;
  color: var(--text-primary);
  width: 30%;
}

.spec-table .spec-value {
  color: var(--text-secondary);
}

/* ===== 规格分组 ===== */
.spec-group {
  margin-bottom: 32px;
}

.spec-group-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-light);
}

/* ===== 文章页样式 ===== */
.article-header {
  background-color: var(--bg-primary);
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border-color);
}

.article-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  gap: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-content {
  background-color: var(--bg-primary);
  padding: 48px 0;
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 40px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 16px;
}

.article-body p {
  margin-bottom: 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-body ul,
.article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.article-body ul li {
  list-style-type: disc;
}

.article-body ol li {
  list-style-type: decimal;
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

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

.btn-outline:hover {
  background-color: var(--accent-color);
  color: white;
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.pagination a {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.pagination a:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.pagination .current {
  background-color: var(--accent-color);
  color: white;
}

.pagination .disabled {
  color: var(--text-muted);
  cursor: not-allowed;
}

/* ===== 三栏文章推荐 ===== */
.three-col-section {
  background-color: var(--bg-tertiary);
  padding: 48px 0;
}

.three-col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.col-section h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.col-section ul li {
  margin-bottom: 12px;
}

.col-section ul li a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.col-section ul li a::before {
  content: "•";
  color: var(--accent-color);
}

.col-section ul li a:hover {
  color: var(--accent-color);
}

/* ===== 两栏文章推荐 ===== */
.two-col-section {
  background-color: var(--bg-secondary);
  padding: 48px 0;
}

.two-col-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

/* ===== 页脚 ===== */
.footer {
  background-color: var(--accent-dark);
  color: white;
  padding: 48px 0 24px;
}

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

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

.footer-brand p {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: white;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
}

.footer-col ul li a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
}

/* ===== 404 页面 ===== */
.error-page {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
}

.error-content {
  max-width: 500px;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.error-text {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1rem;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* ===== 分类页头部 ===== */
.category-header {
  background-color: var(--bg-primary);
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.category-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
}

/* ===== 产品规格卡片（分类页） ===== */
.product-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  transition: all 0.2s ease;
}

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

.product-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.product-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.product-card-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.product-card-specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.product-card-spec {
  font-size: 0.875rem;
}

.product-card-spec .label {
  color: var(--text-muted);
  display: block;
  font-size: 0.75rem;
  margin-bottom: 2px;
}

.product-card-spec .value {
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== 相关推荐 ===== */
.related-section {
  background-color: var(--bg-secondary);
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.related-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  transition: all 0.2s ease;
}

.related-card:hover {
  border-color: var(--accent-color);
}

.related-card h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .three-col-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 20px;
  }

  .nav {
    order: 3;
    width: 100%;
    margin-top: 12px;
    gap: 20px;
    justify-content: center;
  }

  .hero {
    padding: 60px 0;
  }

  .hero h1 {
    font-size: 1.875rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .three-col-grid,
  .two-col-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .spec-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .article-title {
    font-size: 1.5rem;
  }

  .error-code {
    font-size: 6rem;
  }

  .error-actions {
    flex-direction: column;
  }

  .product-card-specs {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .content-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .search-box {
    display: none;
  }
}