/* ============================================================
   fanqiangdao.com — PaperMod 风格主题
   Blog-first design with airport navigation
   ============================================================ */

/* ===== CSS Variables & Theme ===== */
:root {
  /* Light theme (default) — PaperMod-inspired */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #f0f2f5;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a0;
  --border-color: #e2e4e9;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.1);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --tag-bg: #eef0ff;
  --tag-text: #6366f1;
  --badge-hot: #ef4444;
  --badge-hot-bg: #fef2f2;
  --badge-recommend: #f59e0b;
  --badge-recommend-bg: #fffbeb;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --code-bg: #f1f5f9;
  --code-text: #1e293b;
  --code-border: #e2e8f0;
  --gradient-start: #6366f1;
  --gradient-end: #8b5cf6;
  --toc-bg: #f8fafc;
  --toc-border: #e2e8f0;
  --quote-border: #6366f1;
  --quote-bg: #f8fafc;
  --entry-border: #e2e4e9;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Georgia", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Segoe UI Mono", "Menlo", "Consolas", monospace;
  --content-width: 740px;
  --sidebar-width: 300px;
  --radius: 12px;
  --radius-sm: 8px;
}

[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #17172d;
  --bg-card: #1a1a32;
  --bg-hover: #252545;
  --bg-nav: rgba(15, 15, 26, 0.92);
  --text-primary: #e2e2f0;
  --text-secondary: #9999bb;
  --text-muted: #666688;
  --border-color: #2a2a48;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --accent-light: rgba(99, 102, 241, 0.18);
  --accent-glow: rgba(99, 102, 241, 0.3);
  --tag-bg: rgba(99, 102, 241, 0.2);
  --badge-hot-bg: rgba(239, 68, 68, 0.15);
  --badge-recommend-bg: rgba(245, 158, 11, 0.15);
  --success-bg: rgba(16, 185, 129, 0.15);
  --code-bg: #13132a;
  --code-text: #cbd5e1;
  --code-border: #1e1e3a;
  --toc-bg: #13132a;
  --toc-border: #2a2a48;
  --quote-bg: #13132a;
  --entry-border: #2a2a48;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

::selection {
  background: var(--accent);
  color: white;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ===== Navigation ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.nav-logo:hover {
  color: var(--accent);
}
.nav-logo svg {
  width: 26px;
  height: 26px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
  font-size: 1.5rem;
}

/* ===== Entry Header (Page title section) ===== */
.entry-header {
  max-width: var(--content-width);
  margin: 0 auto 32px;
  padding: 0 20px;
}
.entry-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
}
.entry-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
}

/* ===== Container ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Homepage Layout ===== */
.home-layout {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 36px;
  padding: 32px 0 48px;
}

.home-main {
  min-width: 0;
}

.home-sidebar {
  min-width: 0;
}

/* ===== Featured Airports (Homepage) ===== */
.featured-section {
  margin-bottom: 36px;
}

.featured-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.featured-section-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.featured-section-more {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.featured-section-more:hover {
  color: var(--accent);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.featured-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.featured-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.featured-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.featured-card .price {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
}
.featured-card .price-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

.featured-card-meta {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.featured-card-meta span {
  display: flex;
  align-items: center;
  gap: 3px;
}

.featured-card .tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-weight: 600;
}

/* ===== Post Entries (Homepage blog stream) ===== */
.post-entries {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.post-entry {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.post-entry:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  background: var(--bg-hover);
}

.post-entry-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.post-entry-category {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
}

.post-entry-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-entry h2 {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-primary);
  transition: color 0.2s;
}
.post-entry:hover h2 {
  color: var(--accent);
}

.post-entry-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.post-entry-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.post-entry-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.post-entry-tag {
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.post-entry-linktags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.post-entry-linktag {
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 6px;
  background: var(--success-bg);
  color: var(--success);
  font-weight: 600;
  border: 1px solid transparent;
}
.post-entry-linktag:hover {
  border-color: var(--success);
}

.post-entry-links-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-right: 2px;
}

/* ===== Sidebar ===== */
.sidebar-section {
  margin-bottom: 28px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Ranking list */
.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
}
.ranking-item:hover {
  background: var(--bg-hover);
}

.ranking-number {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
  min-width: 22px;
  text-align: center;
}
.ranking-item:nth-child(1) .ranking-number { color: var(--badge-hot); }
.ranking-item:nth-child(2) .ranking-number { color: var(--badge-recommend); }
.ranking-item:nth-child(3) .ranking-number { color: var(--accent); }

.ranking-info {
  flex: 1;
  min-width: 0;
}
.ranking-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}
.ranking-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.ranking-clicks {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.ranking-clicks strong {
  color: var(--accent);
  font-weight: 700;
}

/* Tag cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud-item {
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 14px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s;
}
.tag-cloud-item:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ===== Page Header (non-home) ===== */
.page-header {
  padding: 40px 0 8px;
}
.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
}
.page-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 8px;
}

/* ===== Blog Page ===== */
.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.filter-btn {
  padding: 6px 18px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.filter-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  min-height: 200px;
}

/* ===== Post Card (blog grid) ===== */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.post-card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 12px;
  align-self: flex-start;
}

.post-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.post-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.post-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.post-card-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-muted);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
  padding-bottom: 20px;
}

.page-btn {
  min-width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}
.page-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.page-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Post Detail ===== */
.post-detail-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 36px;
  padding: 32px 0 48px;
  max-width: 1060px;
  margin: 0 auto;
}

.post-detail-main {
  min-width: 0;
  max-width: var(--content-width);
}

.post-detail-sidebar {
  min-width: 0;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.post-back:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

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

.post-header .post-category {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 14px;
}

.post-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 16px;
}

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

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

.post-tag {
  font-size: 0.75rem;
  padding: 3px 12px;
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* ===== Post Body (Typography) ===== */
.post-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-primary);
  font-family: var(--font-serif);
}

.post-body p {
  margin-bottom: 1.3em;
}

.post-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  margin: 2em 0 0.6em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-sans);
}

.post-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.5em 0 0.5em;
  font-family: var(--font-sans);
}

.post-body ul, .post-body ol {
  margin: 1em 0;
  padding-left: 1.5em;
}

.post-body li {
  margin-bottom: 0.5em;
}

.post-body strong {
  font-weight: 700;
  color: var(--accent);
}

.post-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}
.post-body a:hover {
  color: var(--accent-hover);
}

/* Blockquote */
.post-body blockquote {
  border-left: 4px solid var(--quote-border);
  background: var(--quote-bg);
  padding: 16px 20px;
  margin: 1.5em 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}
.post-body blockquote p:last-child {
  margin-bottom: 0;
}

/* ===== Code Blocks ===== */
.post-body pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 1.5em 0;
  overflow-x: auto;
  position: relative;
  font-size: 0.88rem;
  line-height: 1.6;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--code-text);
}

.post-body pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.88rem;
  color: var(--code-text);
  tab-size: 2;
}

/* Copy button for code blocks */
.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  font-size: 0.72rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, background 0.2s;
  font-family: var(--font-sans);
}
pre:hover .code-copy-btn {
  opacity: 1;
}
.code-copy-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.code-copy-btn.copied {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

/* ===== Tables ===== */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  margin: 1.5em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead {
  background: var(--bg-primary);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.82rem;
  white-space: nowrap;
  border-bottom: 2px solid var(--border-color);
  font-family: var(--font-sans);
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: var(--bg-hover);
}

.highlight-row {
  background: var(--accent-light) !important;
}
.highlight-row td:first-child::before {
  content: '★ ';
  color: var(--badge-recommend);
}

.price-cell {
  font-weight: 700;
  color: var(--accent);
}

/* ===== Table of Contents (TOC) ===== */
.toc {
  background: var(--toc-bg);
  border: 1px solid var(--toc-border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 28px;
  font-size: 0.85rem;
}

.toc-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

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

.toc-list li {
  margin-bottom: 4px;
  line-height: 1.5;
}

.toc-list a {
  color: var(--text-secondary);
  display: block;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s;
  text-decoration: none;
}
.toc-list a:hover {
  color: var(--accent);
}

.toc-list .toc-h2 {
  padding-left: 0;
  font-weight: 600;
}

.toc-list .toc-h3 {
  padding-left: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Mobile TOC (to be shown as collapsible on small screens) */
.toc-mobile-toggle {
  display: none;
}

/* ===== Post Footer (related posts, promo) ===== */
.post-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.post-related {
  margin-bottom: 32px;
}

.post-related h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.post-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.post-related-item {
  padding: 16px 18px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-card);
}
.post-related-item:hover {
  border-color: var(--accent);
}

.post-related-item .category {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.post-related-item h4 {
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-primary);
}

.post-promo {
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  text-align: center;
  margin-bottom: 28px;
}
.post-promo p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.post-promo strong {
  color: var(--accent);
}

.post-nav {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.post-nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.post-nav a:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

/* ===== Airport Detail Page ===== */
.detail-header {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 28px;
}

.detail-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 12px;
}
.detail-title-row h1 {
  font-size: 1.8rem;
  font-weight: 800;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 12px 0 16px;
}
.detail-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.detail-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.promo-btn {
  display: inline-block;
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.promo-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-glow);
  color: white;
}

/* Related articles on airport page */
.airport-related {
  margin-top: 32px;
}

.airport-related h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.airport-related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.airport-related-item {
  padding: 16px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.airport-related-item:hover {
  border-color: var(--accent);
}
.airport-related-item .title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}
.airport-related-item .date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== About Page ===== */
.about-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 32px 0 48px;
}

.about-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.about-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 24px 0 10px;
}

.about-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
  font-size: 1.02rem;
}

.about-content ul {
  margin: 12px 0 20px;
  padding-left: 1.5em;
}

.about-content li {
  margin-bottom: 8px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
  background: var(--bg-secondary);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}

.footer-section h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-section p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
}
.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding: 20px 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-secondary);
}
.footer-bottom a:hover {
  color: var(--accent);
}

/* ===== 404 Page ===== */
.notfound-content {
  max-width: 600px;
  margin: 0 auto;
  padding: 80px 20px;
  text-align: center;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.notfound-content h1 {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}
.notfound-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin: 16px 0 32px;
}

.btn {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent);
  color: white;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}
.btn:hover {
  background: var(--accent-hover);
  color: white;
  transform: translateY(-1px);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state h3 {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ===== Loading ===== */
.loading {
  text-align: center;
  padding: 60px;
  color: var(--text-muted);
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.post-entry {
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}
.post-entry:nth-child(2) { animation-delay: 0.06s; }
.post-entry:nth-child(3) { animation-delay: 0.12s; }
.post-entry:nth-child(4) { animation-delay: 0.18s; }
.post-entry:nth-child(5) { animation-delay: 0.24s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .home-layout {
    grid-template-columns: 1fr;
  }
  .home-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .post-detail-layout {
    grid-template-columns: 1fr;
  }
  .post-detail-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .entry-header h1 {
    font-size: 1.8rem;
  }
  .entry-header p {
    font-size: 1rem;
  }

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

  .post-entry {
    padding: 20px;
  }
  .post-entry h2 {
    font-size: 1.15rem;
  }

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

  .post-header h1 {
    font-size: 1.6rem;
  }

  .post-body {
    font-size: 1rem;
  }
  .post-body h2 {
    font-size: 1.3rem;
  }

  .post-related-grid {
    grid-template-columns: 1fr;
  }

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

  .page-header h1 {
    font-size: 1.6rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .detail-title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 12px;
  }
  .blog-filters .filter-btn {
    flex-shrink: 0;
  }

  /* Mobile TOC */
  .toc-mobile-toggle {
    display: block;
    width: 100%;
    padding: 10px 16px;
    text-align: left;
    background: var(--toc-bg);
    border: 1px solid var(--toc-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 16px;
  }
  .toc-mobile-toggle:hover {
    border-color: var(--accent);
  }
  .toc {
    display: none;
  }
  .toc.open {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    width: 100%;
    padding: 12px 16px;
  }
  .mobile-menu-btn {
    display: block;
  }

  .post-body pre {
    padding: 16px;
    font-size: 0.8rem;
  }
  .code-copy-btn {
    opacity: 1;
    top: 6px;
    right: 6px;
  }

  table {
    font-size: 0.82rem;
  }
  th, td {
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .nav-inner {
    padding: 0 16px;
  }
  .post-entry {
    padding: 16px;
  }
  .post-header h1 {
    font-size: 1.35rem;
  }
  .featured-card {
    padding: 16px;
  }
  .post-body h2 {
    font-size: 1.2rem;
  }
  .post-body h3 {
    font-size: 1.1rem;
  }
}

/* ===== Back Button (generic) ===== */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.back-btn:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

/* ===== Airport Tags (common) ===== */
.airport-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.airport-tag {
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 600;
}
.airport-tag.hot {
  background: var(--badge-hot-bg);
  color: var(--badge-hot);
}
.airport-tag.recommend {
  background: var(--badge-recommend-bg);
  color: var(--badge-recommend);
}

/* ===== Section heading ===== */
.section-heading {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ===== Navigation / Nav Page ===== */


.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
  padding: 1rem 2rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  min-width: 140px;
}

.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: 0.8rem 1.5rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.filters-section {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.filter-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

.filter-row:last-child {
  margin-bottom: 0;
}

.filter-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 65px;
}

.filter-group {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  min-width: 200px;
}

.sort-select {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
}

.airport-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.2rem;
}

.airport-card {
  background: var(--bg-card);
  border-radius: 14px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.25s;
}

.airport-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
  border-color: var(--accent);
}

.airport-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.airport-card-header h3 {
  margin: 0;
  font-size: 1.15rem;
}

.airport-tags {
  display: flex;
  gap: 0.3rem;
}

.airport-tag {
  padding: 0.15rem 0.5rem;
  border-radius: 5px;
  font-size: 0.75rem;
  font-weight: 600;
}

.airport-tag.recommend {
  background: #fef3c7;
  color: #92400e;
}

.airport-tag.popular {
  background: #dbeafe;
  color: #1e40af;
}

.airport-card-body {
  margin-bottom: 1rem;
}

.airport-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  line-height: 1.5;
}

.airport-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.airport-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.airport-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-color);
}

.airport-price {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.airport-price small {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.airport-clicks {
  font-size: 0.8rem;
  color: var(--text-secondary);
}