/* ============================================
   面膜 - www.baishimianmo.cn 样式表
   风格: 案例展示风格 (portfolio-case)
   布局: 分屏布局 (split-screen)
   关键词: 面膜 www.baishimianmo.cn 面膜的介绍 面膜护肤 美容保湿
   ============================================ */

/* CSS 变量 */
:root {
  --accent-color: #00bcd4;
  --accent-light: #b2ebf2;
  --accent-dark: #0097a7;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-dark: #263238;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --max-width: 1200px;
  --header-height: 64px;
}

/* 重置 */
*, *::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: var(--bg-primary);
}

a {
  color: var(--accent-dark);
  text-decoration: none;
}

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

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

ul {
  list-style: none;
}

/* ============================================
   布局组件
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 分屏布局 */
.split-screen {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - var(--header-height) - 200px);
}

.split-left,
.split-right {
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

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

.split-right {
  background: var(--bg-primary);
}

/* ============================================
   页头
   ============================================ */

.header {
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

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

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

.nav a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

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

/* ============================================
   面包屑
   ============================================ */

.breadcrumb {
  background: var(--bg-secondary);
  padding: 16px 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

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

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

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

/* ============================================
   首页英雄区
   ============================================ */

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-title .highlight {
  color: var(--accent-color);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-feature-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
  font-size: 1.25rem;
}

.hero-feature-text {
  font-size: 1rem;
  color: var(--text-primary);
}

/* CTA 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent-dark);
  border: 2px solid var(--accent-color);
}

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

.hero-cta {
  margin-top: 32px;
}

/* 英雄图片区 */
.hero-image-wrapper {
  position: relative;
}

.hero-image {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: #fff;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================
   内容区块
   ============================================ */

.section {
  padding: 60px 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* ============================================
   文章列表
   ============================================ */

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

.article-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  transition: box-shadow 0.2s;
}

.article-item:hover {
  box-shadow: var(--shadow);
}

.article-thumb {
  width: 120px;
  height: 80px;
  background: var(--accent-light);
  border-radius: 4px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-dark);
  font-size: 2rem;
}

.article-content {
  flex: 1;
  min-width: 0;
}

.article-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.article-item:hover .article-title {
  color: var(--accent-dark);
}

.article-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
}

.article-summary {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   三栏推荐区
   ============================================ */

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

.col-section {
  background: var(--bg-secondary);
  padding: 24px;
  border-radius: var(--radius);
}

.col-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-light);
}

.col-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.col-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
}

.col-item::before {
  content: '•';
  color: var(--accent-color);
  font-weight: bold;
}

.col-item a {
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

/* ============================================
   分类页
   ============================================ */

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  padding: 40px 0;
}

.category-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 32px;
  transition: box-shadow 0.2s;
}

.category-card:hover {
  box-shadow: var(--shadow);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.category-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--accent-dark);
}

.category-info h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.category-info span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.category-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.category-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.category-item:last-child {
  border-bottom: none;
}

.category-item a {
  color: var(--text-primary);
  font-size: 0.9375rem;
}

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

.category-item-count {
  font-size: 0.8125rem;
  color: var(--text-muted);
  background: var(--bg-primary);
  padding: 2px 8px;
  border-radius: 12px;
}

.category-view-all {
  display: inline-flex;
  margin-top: 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--accent-dark);
}

.category-view-all:hover {
  color: var(--accent-color);
}

/* ============================================
   文章详情页
   ============================================ */

.article-header {
  text-align: center;
  padding: 40px 0;
}

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

.article-page-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

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

.article-featured-image {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
  border-radius: var(--radius);
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: #fff;
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 20px;
  color: var(--text-primary);
}

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

.article-body p {
  margin-bottom: 20px;
}

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

.article-body ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

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

/* 分屏对比 */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin: 40px 0;
}

.comparison-item {
  background: var(--bg-secondary);
  padding: 32px;
  border-radius: var(--radius);
}

.comparison-item h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--accent-dark);
}

.comparison-item p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 相关文章 */
.related-articles {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

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

.related-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.related-card:hover {
  box-shadow: var(--shadow);
}

.related-thumb {
  width: 100%;
  height: 160px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent-dark);
}

.related-content {
  padding: 20px;
}

.related-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.related-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ============================================
   404页面
   ============================================ */

.error-page {
  min-height: calc(100vh - var(--header-height) - 200px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

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

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 20px;
}

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

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

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

/* ============================================
   页脚
   ============================================ */

.footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 48px 0 24px;
  margin-top: 60px;
}

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

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

.footer-brand p {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: #fff;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
}

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

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

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 1024px) {
  .split-screen {
    grid-template-columns: 1fr;
  }

  .split-left,
  .split-right {
    padding: 40px 24px;
  }

  .hero-image {
    height: 300px;
  }

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

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

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

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

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

@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
  }

  .nav ul {
    gap: 16px;
    font-size: 0.875rem;
  }

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

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .article-item {
    flex-direction: column;
  }

  .article-thumb {
    width: 100%;
    height: 160px;
  }

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

  .article-featured-image {
    height: 240px;
  }

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

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

  .error-code {
    font-size: 5rem;
  }
}

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

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

  .section {
    padding: 40px 0;
  }

  .category-card {
    padding: 24px;
  }

  .comparison-item {
    padding: 24px;
  }

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