/* 生态探险游 - 政策文档风格样式 */
:root {
  --accent-color: #1565c0;
  --accent-light: #e3f2fd;
  --accent-dark: #0d47a1;
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-muted: #9e9e9e;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #fafafa;
  --border-color: #e0e0e0;
  --border-light: #eeeeee;
  --success-color: #2e7d32;
  --warning-color: #ed6c02;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --content-width: 800px;
}

* {
  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-color: var(--bg-secondary);
}

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

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

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent-color);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

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

.nav a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
  text-decoration: none;
}

.search-box {
  position: relative;
}

.search-box input {
  width: 240px;
  padding: 8px 16px 8px 40px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 14px;
  background-color: var(--bg-tertiary);
  transition: all 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-color);
  background-color: var(--bg-primary);
}

.search-box::before {
  content: "🔍";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  opacity: 0.5;
}

/* Main Content */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  border-radius: var(--radius-lg);
  padding: 48px;
  color: white;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 12px;
}

.hero p {
  font-size: 16px;
  opacity: 0.9;
  max-width: 600px;
}

/* Section Title */
.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

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

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

.category-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 8px;
}

.category-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Policy List */
.policy-list {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 40px;
}

.policy-item {
  padding: 24px;
  border-bottom: 1px solid var(--border-light);
  transition: background-color 0.2s;
}

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

.policy-item:hover {
  background-color: var(--bg-tertiary);
}

.policy-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.policy-item h3 a {
  color: var(--text-primary);
}

.policy-item h3 a:hover {
  color: var(--accent-color);
}

.policy-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.policy-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.policy-badge {
  display: inline-block;
  padding: 4px 10px;
  background-color: var(--accent-light);
  color: var(--accent-color);
  font-size: 12px;
  font-weight: 500;
  border-radius: 12px;
  margin-top: 12px;
}

/* Breadcrumb */
.breadcrumb {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  font-size: 14px;
}

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

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

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

.breadcrumb strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* Article Content */
.article-container {
  max-width: var(--content-width);
  margin: 0 auto;
}

.article-header {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 24px;
}

.article-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

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

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

/* Table of Contents */
.toc {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.toc h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.toc ul {
  list-style: none;
}

.toc li {
  padding: 6px 0;
  font-size: 14px;
}

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

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

/* Article Body */
.article-body {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
}

.article-body h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 24px 0 12px;
}

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

.article-body ul,
.article-body ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Article Actions */
.article-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--accent-dark);
  text-decoration: none;
  color: white;
}

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

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-color);
  color: var(--accent-color);
  text-decoration: none;
}

/* Sidebar Sections */
.sidebar-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-section h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

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

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

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

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

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

/* Three Column Layout */
.three-column {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

/* Two Column Layout */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 32px;
}

/* 404 Page */
.error-page {
  text-align: center;
  padding: 80px 24px;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 24px;
}

.error-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.error-message {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Footer */
.footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 12px;
}

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

.footer-column h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

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

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

.footer-column a {
  font-size: 14px;
  color: var(--text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    flex-direction: column;
    padding: 16px;
    gap: 16px;
  }

  .nav {
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .search-box input {
    width: 200px;
  }

  .hero {
    padding: 32px 24px;
  }

  .hero h1 {
    font-size: 24px;
  }

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

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

  .article-title {
    font-size: 22px;
  }

  .article-body {
    padding: 24px;
  }

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

  .error-code {
    font-size: 80px;
  }
}

@media (max-width: 480px) {
  .main {
    padding: 20px 16px;
  }

  .hero {
    padding: 24px 20px;
  }

  .article-header,
  .article-body {
    padding: 20px;
  }

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

  .btn {
    justify-content: center;
  }
}