/**
 * main.css - 前台样式
 * 响应式新闻博客风格，支持手机和PC
 */

/* ========== CSS 变量 ========== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-bg: #f8fafc;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-danger: #ef4444;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --header-height: 64px;
  --container-max: 1200px;
  --transition: 0.2s ease;
}

/* ========== Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ========== Header / Navbar ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.navbar {
  max-width: var(--container-max);
  margin: 0 auto;
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 24px;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}
.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}
.brand-slogan {
  font-size: 12px;
  color: var(--color-text-muted);
  display: none;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.search-box {
  display: flex;
  align-items: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px 16px;
  gap: 8px;
  transition: border-color var(--transition);
}
.search-box:focus-within { border-color: var(--color-primary); }
.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  width: 140px;
  color: var(--color-text);
}
.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0;
  font-size: 16px;
}
.admin-link-btn {
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  transition: background var(--transition);
}
.admin-link-btn:hover { background: var(--color-primary-dark); color: #fff; }

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text);
  padding: 4px;
}

/* ========== Mobile Nav ========== */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 99;
  flex-direction: column;
  padding: 20px;
  gap: 8px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav .nav-link {
  padding: 12px 16px;
  font-size: 16px;
  border-radius: var(--radius);
}
.mobile-search-box {
  display: flex;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 16px;
  gap: 8px;
  margin-bottom: 12px;
}
.mobile-search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 15px;
  flex: 1;
}
.mobile-search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 18px;
}

/* ========== Main Content ========== */
#app-main {
  min-height: calc(100vh - var(--header-height) - 200px);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 24px 20px;
}

/* ========== Ad Container ========== */
.ad-container {
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--color-border);
}
.ad-placeholder-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 13px;
  text-align: center;
  padding: 20px;
}
.ad-badge {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  background: var(--color-text-muted);
  color: #fff;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ========== Section Title ========== */
.section-title {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}
.section-title h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  position: relative;
  padding-left: 14px;
}
.section-title h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* ========== Featured Section ========== */
.featured-section { margin-bottom: 32px; }
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.featured-grid .featured-item {
  display: flex;
  flex-direction: column;
}

/* ========== Article Card ========== */
.article-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.article-card.featured-item .card-cover { height: 160px; }
.article-card.list-item { flex-direction: row; }
.article-card.list-item .card-cover { width: 240px; height: 160px; flex-shrink: 0; }
.article-card.list-item .card-body { padding: 20px; }
.article-card.related-item .card-cover { height: 160px; }

.card-cover {
  width: 100%;
  background-size: cover;
  background-position: center;
  background-color: var(--color-border);
  position: relative;
}
.card-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.8);
  font-size: 48px;
  font-weight: 700;
}
.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 8px;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}
.cat-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  color: #fff;
  font-size: 12px;
  font-weight: 500;
}
.cat-badge-lg { font-size: 14px; padding: 4px 14px; }
.card-date { color: var(--color-text-muted); }
.card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.featured-item .card-title { font-size: 18px; -webkit-line-clamp: 2; }
.card-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 2px 8px;
  border-radius: 4px;
}
.tag-lg { font-size: 13px; padding: 4px 12px; cursor: pointer; }
.tag-lg:hover { background: var(--color-primary-light); color: var(--color-primary); }
.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 8px;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ========== Content Layout ========== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  margin-bottom: 32px;
}
.content-layout.article-page { grid-template-columns: 260px minmax(0, 1fr) 260px; gap: 24px; }
.article-aside-left, .article-aside-right { display: flex; flex-direction: column; gap: 24px; min-width: 0; }

/* ========== Article List ========== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.article-list-compact { gap: 12px; }
.article-list-compact .article-card.list-item .card-cover { width: 180px; height: 110px; }
.article-list-compact .article-card.list-item .card-body { padding: 14px 16px; }
.article-list-compact .card-summary { -webkit-line-clamp: 1; }
.article-list-compact .card-tags { display: none; }
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
  font-size: 16px;
}

/* ========== Sidebar ========== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.sidebar-widget {
  background: var(--color-bg-card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.widget-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}
.widget-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 40px;
  height: 2px;
  background: var(--color-primary);
}
.category-list li { margin-bottom: 4px; }
.category-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  font-size: 14px;
  color: var(--color-text);
  transition: all var(--transition);
}
.category-list a:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}
.cat-count {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 2px 8px;
  border-radius: 10px;
}
.popular-list li {
  display: flex;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border-light);
  cursor: pointer;
  transition: background var(--transition);
}
.popular-list li:last-child { border-bottom: none; }
.popular-list li:hover { background: var(--color-bg); margin: 0 -20px; padding: 6px 20px; border-radius: var(--radius-sm); }
.popular-rank {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}
.popular-list li:nth-child(1) .popular-rank { color: #ef4444; }
.popular-list li:nth-child(2) .popular-rank { color: #f59e0b; }
.popular-list li:nth-child(3) .popular-rank { color: #3b82f6; }
.popular-info { display: flex; flex-direction: column; gap: 2px; }
.popular-cat { font-size: 12px; font-weight: 500; }
.popular-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.popular-views { font-size: 12px; color: var(--color-text-muted); }

/* ========== Tag Cloud ========== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 16px;
  color: #fff;
  font-size: 13px;
  text-decoration: none;
  transition: filter var(--transition), transform var(--transition);
}
.tag-chip:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
  color: #fff;
}
.tag-chip-count {
  font-size: 11px;
  background: rgba(255,255,255,0.25);
  padding: 1px 6px;
  border-radius: 8px;
}

/* ========== Article Page ========== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.breadcrumb .sep { color: var(--color-border); }
.breadcrumb .current { color: var(--color-text); font-weight: 500; }
.article-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  margin: 12px 0;
  color: var(--color-text);
}
.article-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.article-cover {
  width: 100%;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  max-height: 400px;
  object-fit: cover;
}
.article-summary {
  font-size: 16px;
  color: var(--color-text-light);
  padding: 16px 20px;
  background: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 24px;
}
.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}
.article-content h2 { font-size: 22px; margin: 24px 0 12px; }
.article-content h3 { font-size: 18px; margin: 20px 0 10px; }
.article-content p { margin-bottom: 16px; }
.article-content ul, .article-content ol {
  margin: 12px 0 16px 20px;
}
.article-content ul li { list-style: disc; margin-bottom: 6px; }
.article-content ol li { list-style: decimal; margin-bottom: 6px; }
.article-content blockquote {
  margin: 16px 0;
  padding: 12px 20px;
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text);
}
.article-content img { border-radius: var(--radius); margin: 16px 0; }
.article-content strong { font-weight: 600; }
.article-content code {
  background: var(--color-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

/* ========== Related Section ========== */
.related-section { margin-bottom: 32px; }
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.related-grid .card-title { font-size: 15px; }
.related-grid .card-summary { display: none; }
.related-grid .card-footer { display: none; }

/* ========== Pagination ========== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text);
  background: #fff;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.page-link:hover { border-color: var(--color-primary); color: var(--color-primary); }
.page-link.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.page-info { color: var(--color-text-muted); font-size: 14px; margin-right: 12px; }

/* ========== Category / Search Header ========== */
.category-header, .search-header {
  margin-bottom: 24px;
  padding: 20px 24px;
  background: var(--color-bg-card);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.category-title, .search-title { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.category-desc { color: var(--color-text-light); margin-bottom: 8px; }
.category-count { font-size: 13px; color: var(--color-text-muted); }
.search-query { color: var(--color-text-light); margin-bottom: 8px; }

/* ========== About Page ========== */
.about-page {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.page-title { font-size: 28px; margin-bottom: 20px; }

/* ========== Error Page ========== */
.error-page {
  text-align: center;
  padding: 80px 20px;
}
.error-page h1 { font-size: 72px; color: var(--color-primary); }
.error-page p { font-size: 18px; color: var(--color-text-light); margin: 12px 0 24px; }
.btn-back {
  display: inline-block;
  padding: 10px 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  transition: background var(--transition);
}
.btn-back:hover { background: var(--color-primary-dark); color: #fff; }

/* ========== Footer ========== */
.site-footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 40px 20px 20px;
  margin-top: 40px;
}
.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
.footer-brand h3 { color: #fff; font-size: 20px; margin-bottom: 8px; }
.footer-brand p { font-size: 14px; color: #94a3b8; line-height: 1.6; }
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col a { color: #94a3b8; font-size: 14px; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  max-width: var(--container-max);
  margin: 24px auto 0;
  padding-top: 20px;
  border-top: 1px solid #334155;
  text-align: center;
  font-size: 13px;
  color: #64748b;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .content-layout, .content-layout.article-page { grid-template-columns: 1fr; gap: 20px; }
  .sidebar { order: -1; flex-direction: row; flex-wrap: wrap; }
  .sidebar-widget { flex: 1; min-width: 260px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .featured-grid { grid-template-columns: repeat(2, 1fr); }
  .article-page .main-column { order: 1; }
  .article-page .article-aside-left { order: 2; }
  .article-page .article-aside-right { order: 3; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 16px; gap: 12px; }
  .nav-links, .search-box, .admin-link-btn { display: none; }
  .menu-toggle { display: block; }
  .mobile-nav { display: flex; }
  .brand-slogan { display: none; }

  #app-main { padding: 16px; }

  .article-card.list-item { flex-direction: column; }
  .article-card.list-item .card-cover { width: 100%; height: 180px; }

  .featured-grid .featured-item .card-cover { height: 150px; }

  .article-title { font-size: 22px; }
  .article-content { font-size: 15px; }
  .article-content h2 { font-size: 18px; }
  .article-content h3 { font-size: 16px; }

  .related-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .related-grid .card-body { padding: 12px; }

  .footer-container { grid-template-columns: 1fr; gap: 20px; }

  .sidebar { flex-direction: column; }

  .pagination { gap: 4px; }
  .page-link { min-width: 32px; height: 32px; font-size: 13px; }

  .category-header, .search-header { padding: 16px; }
  .category-title, .search-title { font-size: 20px; }
}

@media (max-width: 480px) {
  .related-grid { grid-template-columns: 1fr; }
  .article-card.list-item .card-cover { height: 160px; }
  .card-title { font-size: 16px; }
  .featured-grid { grid-template-columns: 1fr; }
}