/* 分子料理 - 食谱风格样式表 */
/* 主色调: #ff9800 (橙色) */

/* ===== CSS 变量 ===== */
:root {
  --accent-color: #ff9800;
  --accent-dark: #f57c00;
  --accent-light: #ffe0b2;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-white: #fff;
  --bg-light: #f8f9fa;
  --bg-gray: #f0f0f0;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

/* ===== 重置样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-light);
}

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  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;
}

/* ===== 头部导航 ===== */
.header {
  background: var(--bg-white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.3s;
}

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border-radius: 20px;
  padding: 8px 16px;
  gap: 8px;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  width: 180px;
  font-size: 0.9rem;
}

.search-box button {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
}

/* ===== 面包屑导航 ===== */
.breadcrumb {
  background: var(--bg-white);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  gap: 8px;
  font-size: 0.9rem;
}

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

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

.breadcrumb li:not(:last-child)::after {
  content: ">";
  margin-left: 8px;
  color: var(--text-muted);
}

.breadcrumb li:last-child {
  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-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto 30px;
}

.hero-cta {
  display: inline-flex;
  gap: 15px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
}

/* ===== 特色区块 ===== */
.section {
  padding: 60px 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

/* ===== 卡片组件 ===== */
.card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s, transform 0.3s;
}

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

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  background: var(--bg-gray);
}

.card-body {
  padding: 20px;
}

.card-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-light);
  color: var(--accent-dark);
  font-size: 0.8rem;
  border-radius: 12px;
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 15px;
}

.card-meta {
  display: flex;
  gap: 15px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ===== 网格布局 ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

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

/* ===== 列表组件 ===== */
.list-group {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 20px;
}

.list-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-light);
}

.list-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

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

.list-item a {
  color: var(--text-primary);
  transition: color 0.3s;
}

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

/* ===== 内容列表项 ===== */
.content-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.content-item {
  display: flex;
  gap: 20px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s;
}

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

.content-item-image {
  width: 280px;
  min-height: 180px;
  object-fit: cover;
  background: var(--bg-gray);
  flex-shrink: 0;
}

.content-item-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.content-item-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.content-item-desc {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 15px;
  flex: 1;
}

.content-item-meta {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== 分类头部 ===== */
.category-header {
  background: var(--bg-white);
  padding: 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.category-desc {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 20px;
}

.category-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.category-stats span {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ===== 文章详情页 ===== */
.article-header {
  background: var(--bg-white);
  padding: 40px 0;
}

.article-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.4;
}

.article-meta {
  display: flex;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-featured-image {
  width: 100%;
  max-height: 500px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin: 30px 0;
}

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

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 30px 0 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-light);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 25px 0 12px;
  color: var(--accent-dark);
}

.article-content p {
  margin-bottom: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
  margin-bottom: 16px;
  padding-left: 25px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

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

.article-content img {
  border-radius: var(--radius);
  margin: 20px 0;
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 40px 0;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--bg-white);
  color: var(--text-primary);
  font-weight: 500;
  transition: all 0.3s;
}

.pagination a:hover {
  background: var(--accent-light);
  color: var(--accent-dark);
}

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

/* ===== 三栏底部区块 ===== */
.three-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 60px 0 30px;
  margin-top: 60px;
}

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

.footer-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 15px;
}

.footer-desc {
  color: #aaa;
  line-height: 1.6;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 15px;
}

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

.footer-links a {
  color: #aaa;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid #444;
  padding-top: 20px;
  text-align: center;
  color: #888;
  font-size: 0.9rem;
}

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

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

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .nav {
    display: none;
  }

  .search-box {
    display: none;
  }

  .hero {
    padding: 60px 0;
  }

  .hero-title {
    font-size: 1.75rem;
  }

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

  .hero-cta {
    flex-direction: column;
    width: 100%;
    padding: 0 20px;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .content-item-image {
    width: 100%;
    min-height: 200px;
  }

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

  .article-content {
    padding: 20px;
  }

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

  .category-stats {
    flex-direction: column;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 40px 0;
  }

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

/* ===== 辅助类 ===== */
.bg-white {
  background: var(--bg-white);
}

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

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}