/* 显微摄影 - 研究论文风格样式表 */
/* 主色调: #5e35b1 (学术紫) */

:root {
  --primary-color: #5e35b1;
  --primary-light: #7e57c2;
  --primary-dark: #4527a0;
  --accent-color: #00acc1;
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-muted: #9e9e9e;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #fafafa;
  --border-color: #e0e0e0;
  --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;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

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

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

/* Header */
.header {
  background: 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 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
}

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

.nav a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
}

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

.search-box {
  position: relative;
}

.search-box input {
  width: 240px;
  height: 40px;
  padding: 0 40px 0 16px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 14px;
  background: var(--bg-secondary);
  transition: all 0.2s;
}

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

.search-box button {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

/* Main Container */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 20px;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-radius: var(--radius-md);
  margin-bottom: 48px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-search {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.hero-search input {
  width: 100%;
  height: 56px;
  padding: 0 120px 0 24px;
  border: 2px solid var(--border-color);
  border-radius: 28px;
  font-size: 16px;
  background: var(--bg-primary);
  transition: border-color 0.2s;
}

.hero-search input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.hero-search button {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  height: 44px;
  padding: 0 24px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 22px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.hero-search button:hover {
  background: var(--primary-dark);
}

/* Section Title */
.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-color);
  display: inline-block;
}

/* Categories Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

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

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

.category-card .icon {
  width: 48px;
  height: 48px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 20px;
}

.category-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.category-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Article List */
.article-list {
  margin-bottom: 48px;
}

.article-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  transition: all 0.2s;
}

.article-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.article-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

.article-item h3 a:hover {
  color: var(--primary-color);
}

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

.article-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.article-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: 12px;
  font-size: 12px;
  color: var(--text-secondary);
}

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

/* Sidebar Layout */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-section {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 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-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 {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}

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

.sidebar-list .count {
  color: var(--text-muted);
  font-size: 12px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

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

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

.breadcrumb .sep {
  color: var(--text-muted);
}

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

/* Page Header */
.page-header {
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.page-header p {
  font-size: 15px;
  color: var(--text-secondary);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
}

.filter-bar select {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--bg-primary);
  cursor: pointer;
}

/* Article Detail */
.article-detail {
  background: var(--bg-primary);
}

.article-header {
  margin-bottom: 32px;
}

.article-header h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

.article-info {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

.article-info-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-info-item .label {
  color: var(--text-muted);
}

.article-info-item .value {
  color: var(--text-primary);
  font-weight: 500;
}

.article-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

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

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

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

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

/* Abstract Box */
.abstract-box {
  background: var(--bg-tertiary);
  border-left: 4px solid var(--primary-color);
  padding: 24px;
  margin-bottom: 32px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.abstract-box h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.abstract-box p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* Article Content */
.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 40px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 16px;
}

.article-content p {
  margin-bottom: 16px;
}

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

.article-content li {
  margin-bottom: 8px;
}

.article-content pre {
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 14px;
  margin-bottom: 16px;
}

.article-content code {
  font-family: "SF Mono", Monaco, monospace;
  font-size: 14px;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 24px 0;
}

/* TOC */
.toc {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 32px;
}

.toc h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.toc ul {
  list-style: none;
  padding: 0;
}

.toc li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

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

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

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

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.pagination a {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.pagination a:hover {
  background: var(--primary-color);
  color: white;
}

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

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

/* 404 Page */
.error-page {
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--primary-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: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

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

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 16px;
  line-height: 1.7;
}

.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(--primary-color);
}

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

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 992px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }

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

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

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

  .search-box {
    order: 2;
  }

  .search-box input {
    width: 180px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero p {
    font-size: 16px;
  }

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

  .article-header h1 {
    font-size: 24px;
  }

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

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

@media (max-width: 480px) {
  .categories-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    flex-direction: column;
  }

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

  .btn {
    justify-content: center;
  }
}