/* 艺术摄影 - 全局样式 */
:root {
  --accent-color: #009688;
  --accent-light: #4db6ac;
  --accent-dark: #00796b;
  --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);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

* {
  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-primary);
}

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

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

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

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

/* 页头 */
.header {
  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: 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;
}

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

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

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  width: 180px;
  font-size: 14px;
}

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

/* Hero区域 */
.hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #37474f 100%);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

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

.hero p {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-btn {
  display: inline-block;
  background: var(--accent-color);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.hero-btn:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-2px);
}

/* 区块标题 */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

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

/* 分类网格 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.category-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.category-icon {
  width: 64px;
  height: 64px;
  background: var(--bg-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.75rem;
}

.category-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

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

/* 文章列表 */
.article-section {
  padding: 48px 0;
}

.article-section.alt {
  background: var(--bg-secondary);
}

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

.article-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.article-image {
  aspect-ratio: 16/10;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 3rem;
}

.article-content {
  padding: 20px;
}

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 1rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.article-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 特色指南 */
.featured-guide {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.featured-content h2 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.featured-content p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.featured-image {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--accent-light), var(--accent-color));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 4rem;
}

/* 步骤列表 */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

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

/* 面包屑 */
.breadcrumb {
  padding: 16px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  gap: 8px;
  font-size: 14px;
}

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

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

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

/* 分类页标题 */
.category-header {
  padding: 48px 0;
  background: var(--bg-secondary);
  text-align: center;
}

.category-header h1 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.category-header p {
  color: var(--text-secondary);
}

/* 难度标签 */
.difficulty {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--text-secondary);
}

.difficulty .star {
  color: #ffc107;
}

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  font-size: 14px;
  transition: all 0.2s;
}

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

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

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

/* 文章详情页 */
.article-header {
  padding: 48px 0 32px;
  text-align: center;
}

.article-header h1 {
  font-size: 2rem;
  margin-bottom: 16px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.article-info {
  display: flex;
  justify-content: center;
  gap: 24px;
  color: var(--text-secondary);
  font-size: 14px;
}

.article-featured-image {
  aspect-ratio: 21/9;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 5rem;
}

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

.article-body h2 {
  font-size: 1.5rem;
  margin: 48px 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 32px 0 16px;
  color: var(--accent-dark);
}

.article-body p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

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

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

/* 提示框 */
.tip-box {
  background: #e8f5e9;
  border-left: 4px solid var(--accent-color);
  padding: 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}

.tip-box-title {
  font-weight: 600;
  color: var(--accent-dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tip-box p {
  margin: 0;
  color: var(--text-secondary);
}

/* 检查清单 */
.checklist {
  list-style: none;
  padding: 0;
}

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

.checklist li::before {
  content: '☐';
  color: var(--accent-color);
  font-size: 1.25rem;
}

.checklist li.checked::before {
  content: '☑';
}

/* 侧边栏 */
.sidebar-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
}

.sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.sidebar-widget {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-widget h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

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

.sidebar-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.sidebar-list a {
  color: var(--text-secondary);
  font-size: 14px;
  display: block;
}

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

/* 步骤概览 */
.steps-overview {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 48px;
}

.steps-overview h3 {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.step-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius);
  transition: background 0.2s;
}

.step-nav-item:hover {
  background: var(--bg-primary);
}

.step-nav-item.completed .step-status {
  color: var(--accent-color);
}

.step-nav-item.current {
  background: var(--bg-primary);
  border-left: 3px solid var(--accent-color);
}

.step-status {
  width: 24px;
  text-align: center;
  color: var(--text-muted);
}

.step-nav-text {
  font-size: 14px;
  color: var(--text-secondary);
}

.step-nav-item.current .step-nav-text {
  color: var(--text-primary);
  font-weight: 500;
}

/* 404页面 */
.error-page {
  min-height: calc(100vh - var(--header-height) - 300px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 0;
}

.error-content h1 {
  font-size: 6rem;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.error-content p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* 页脚 */
.footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 48px 0 24px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.footer-brand p {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  line-height: 1.8;
}

.footer-links h4 {
  font-size: 14px;
  margin-bottom: 16px;
  color: rgba(255,255,255,0.9);
}

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

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

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
}

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

  .featured-guide {
    grid-template-columns: 1fr;
  }

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

  .sidebar {
    position: static;
  }

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

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .search-box {
    display: none;
  }

  .hero {
    padding: 48px 0;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

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

  .featured-guide {
    padding: 24px;
  }

  .article-info {
    flex-wrap: wrap;
    gap: 12px;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

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

  .section-title {
    font-size: 1.25rem;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .error-content h1 {
    font-size: 4rem;
  }
}