/* JichangBest Introduction Theme CSS - Clean, High-Contrast, Minimalist Knowledge Base */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-hover: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;
  
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #64748b;
  
  --color-primary: #0284c7;
  --color-primary-hover: #0369a1;
  --color-primary-light: #e0f2fe;
  --color-primary-dark: #075985;
  
  --color-success: #16a34a;
  --color-success-bg: #dcfce7;
  --color-warning: #ea580c;
  --color-warning-bg: #ffedd5;
  --color-info-bg: #eff6ff;
  
  --container-width: 1360px;
  --content-width: 860px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #090d16;
    --color-surface: #131b2e;
    --color-surface-hover: #1c2742;
    --color-border: #1e293b;
    --color-border-dark: #334155;
    
    --color-text: #f1f5f9;
    --color-text-muted: #cbd5e1;
    --color-text-light: #94a3b8;
    
    --color-primary: #38bdf8;
    --color-primary-hover: #7dd3fc;
    --color-primary-light: #082f49;
    --color-primary-dark: #bae6fd;
    
    --color-info-bg: #0c1a2e;
    --color-success-bg: #052e16;
    --color-warning-bg: #431407;
  }
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.site-logo-img {
  border-radius: 7px;
  width: 30px;
  height: 30px;
  object-fit: cover;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.brand-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-left: 2px solid var(--color-border-dark);
  padding-left: 10px;
  display: inline-block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}

.header-search-input {
  padding: 7px 12px 7px 32px;
  font-size: 0.85rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  width: 170px;
  transition: width 0.2s ease, border-color 0.2s ease;
}

.header-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  width: 220px;
  background: var(--color-bg);
}

.header-search-icon {
  position: absolute;
  left: 9px;
  width: 14px;
  height: 14px;
  color: var(--color-text-light);
  pointer-events: none;
}

.search-results-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  width: 320px;
  max-height: 380px;
  overflow-y: auto;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: 6px;
  z-index: 200;
  list-style: none;
  padding: 6px 0;
}

.search-results-dropdown.active {
  display: block;
}

.search-result-item a {
  display: block;
  padding: 8px 14px;
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.search-result-item a:hover {
  background: var(--color-surface);
  color: var(--color-primary);
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--color-text-light);
  display: block;
  margin-top: 2px;
}

.btn-header-tg {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff !important;
  background-color: #229ed9;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  transition: background-color 0.15s ease;
}

.btn-header-tg:hover {
  background-color: #1b87ba;
}

.btn-header-cta {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff !important;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  text-decoration: none !important;
}

.btn-header-cta:hover {
  background-color: var(--color-primary-hover);
}

/* Prominent Registration Box inside Articles */
.prominent-providers-block {
  margin: 36px 0;
  padding: 24px;
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.prominent-block-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.prominent-block-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.prominent-provider-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.prominent-provider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.prominent-provider-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.prominent-provider-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
}

.prominent-provider-features {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.6;
}

.prominent-provider-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

.btn-prominent-register {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff !important;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  border-radius: var(--radius-md);
  text-decoration: none !important;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-prominent-register:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(2, 132, 199, 0.35);
}

.btn-secondary-review {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: underline;
}

.btn-secondary-review:hover {
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text);
}

/* Main Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  white-space: nowrap;
  padding: 8px 0;
}

.nav-link {
  padding: 6px 12px;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-surface);
  text-decoration: none;
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-light);
}

/* Breadcrumbs */
.breadcrumbs-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.breadcrumbs-item a {
  color: var(--color-text-muted);
}

.breadcrumbs-separator {
  color: var(--color-text-light);
}

/* Hero Section */
.hero-section {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 2.25rem;
  line-height: 1.25;
  font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.hero-keywords-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 860px;
  margin-bottom: 24px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff !important;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  text-decoration: none !important;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 11px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text) !important;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  text-decoration: none !important;
}

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

.hero-disclosure-note {
  font-size: 0.8rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 4 Core Entry Cards (Knowledge-Oriented Layout) */
.core-entries-section {
  padding: 40px 0;
}

.section-header {
  margin-bottom: 28px;
}

.section-title {
  font-size: 1.65rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.entries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.entry-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

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

.entry-card-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.entry-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.entry-card-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.entry-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Service Info Card on Homepage */
.service-info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
}

.service-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

/* Recommendation Cards */
.providers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.provider-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.provider-card.primary-featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.provider-rank-badge {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.provider-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
  padding-right: 48px;
}

.provider-suitable {
  font-size: 0.85rem;
  color: var(--color-primary-dark);
  font-weight: 600;
  margin-bottom: 14px;
}

.provider-pricing {
  margin-bottom: 14px;
  padding: 10px 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.price-main {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}

.price-sub {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.coupon-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-warning-bg);
  border: 1px dashed var(--color-warning);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.coupon-code {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-warning);
}

.btn-copy {
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
}

.provider-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
}

.btn-review-link {
  display: block;
  text-align: center;
  padding: 9px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  background: var(--color-bg);
  text-decoration: none !important;
}

.btn-review-link:hover {
  background: var(--color-surface);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-aff-cta {
  display: block;
  text-align: center;
  padding: 9px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff !important;
  text-decoration: none !important;
}

.btn-aff-cta:hover {
  background: var(--color-primary-hover);
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin: 32px 0 44px;
  background: var(--color-bg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
  line-height: 1.6;
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.comparison-table th {
  background: #f8fafc;
  font-weight: 700;
  color: #0f172a;
  border-bottom: 2px solid #cbd5e1;
  white-space: nowrap;
  font-size: 0.95rem;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  white-space: nowrap;
  font-weight: 700;
}

.comparison-table th:nth-child(2),
.comparison-table td:nth-child(2) {
  white-space: nowrap;
  font-weight: 600;
  color: #0284c7;
}

.comparison-table th:last-child,
.comparison-table td:last-child {
  white-space: nowrap;
  text-align: center;
}

.comparison-table tbody tr:nth-child(even) td,
.comparison-table tr:nth-child(even) td {
  background-color: #fafbfc;
}

.comparison-table tr:hover td {
  background-color: #f0f9ff;
}

.comparison-table td a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 16px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(2, 132, 199, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.comparison-table td a:hover {
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(2, 132, 199, 0.35);
  background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
}

/* Interactive Table Filter Bar */
.table-filter-bar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
}

.filter-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.filter-input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.filter-input-wrap input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.925rem;
  color: var(--color-text);
  width: 100%;
}

.filter-count {
  font-size: 0.8rem;
  color: var(--color-text-light);
  white-space: nowrap;
  font-weight: 500;
}

.filter-tags-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-tag-label {
  font-size: 0.8rem;
  color: var(--color-text-light);
  font-weight: 600;
  margin-right: 4px;
}

.filter-tag-btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-tag-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.filter-tag-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
}

/* Heading Permalink Anchor */
.heading-anchor {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.85em;
  color: var(--color-text-light);
  text-decoration: none !important;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
  vertical-align: middle;
  cursor: pointer;
}

.article-prose h2:hover .heading-anchor,
.article-prose h3:hover .heading-anchor {
  opacity: 1;
}

.heading-anchor:hover {
  color: var(--color-primary);
}

/* Copy Toast */
.copy-toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: #0f172a;
  color: #ffffff;
  padding: 8px 18px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.copy-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Featured Article Hero for Section Pages */
.featured-article-hero {
  position: relative;
  background: linear-gradient(135deg, #ffffff 0%, #f0fdfa 50%, #eff6ff 100%);
  border: 2px solid #0284c7;
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin-bottom: 36px;
  box-shadow: 0 12px 28px -6px rgba(2, 132, 199, 0.16), 0 4px 10px -2px rgba(2, 132, 199, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.featured-article-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 36px -8px rgba(2, 132, 199, 0.26);
}

.featured-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  padding: 6px 16px;
  border-radius: 9999px;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
}

.featured-hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 14px;
}

.featured-hero-title a {
  color: #0f172a;
  text-decoration: none;
  transition: color 0.15s ease;
}

.featured-hero-title a:hover {
  color: #0284c7;
}

.featured-hero-desc {
  font-size: 1.05rem;
  color: #334155;
  line-height: 1.75;
  margin-bottom: 22px;
}

.featured-hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.highlight-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: #1e293b;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.featured-hero-action {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-featured-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  text-decoration: none !important;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
  transition: all 0.2s ease;
}

.btn-featured-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(2, 132, 199, 0.45);
  background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
}

@media (max-width: 768px) {
  .featured-article-hero {
    padding: 24px 20px;
  }
  .featured-hero-title {
    font-size: 1.4rem;
  }
  .featured-hero-desc {
    font-size: 0.95rem;
  }
  .btn-featured-hero {
    width: 100%;
    justify-content: center;
    font-size: 1rem;
    padding: 12px 20px;
  }
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--color-primary);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.article-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
  flex-grow: 1;
}

.article-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-light);
  display: flex;
  justify-content: space-between;
}

/* Article Details Content Area */
.article-layout {
  display: block;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px;
}

@media (min-width: 1080px) {
  .article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 48px;
    align-items: start;
  }
}

.article-single {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
}

.article-header,
.article-summary-box,
.article-prose > p,
.article-prose > ul,
.article-prose > ol,
.article-prose > blockquote,
.article-prose > .callout,
.article-prose > hr,
.article-prose > h2,
.article-prose > h3 {
  max-width: var(--content-width);
}

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

.article-title {
  font-size: 2.15rem;
  line-height: 1.3;
  font-weight: 800;
  margin-bottom: 14px;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.article-summary-box {
  background: var(--color-info-bg);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 28px;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text);
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text);
}

.article-prose h2 {
  font-size: 1.55rem;
  font-weight: 700;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 24px 0 12px;
}

.article-prose p {
  margin-bottom: 18px;
}

.article-prose ul,
.article-prose ol {
  margin-bottom: 18px;
  padding-left: 24px;
}

.article-prose li {
  margin-bottom: 6px;
}

.article-prose hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 32px 0;
}

/* Callout Alert Boxes */
.callout {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin: 20px 0;
  font-size: 0.925rem;
  line-height: 1.6;
}

.callout-note {
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
}

.callout-tip {
  background: var(--color-success-bg);
  border-left: 4px solid var(--color-success);
}

.callout-warning {
  background: var(--color-warning-bg);
  border-left: 4px solid var(--color-warning);
}

/* Sidebar Table of Contents (TOC) & Scrollspy */
.article-sidebar {
  display: none;
}

@media (min-width: 1080px) {
  .article-sidebar {
    display: block;
    position: sticky;
    top: 90px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    overflow-x: hidden;
  }
}

.article-sidebar.has-toc {
  display: block;
}

.article-sidebar::-webkit-scrollbar {
  width: 4px;
}
.article-sidebar::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
.article-sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-dark);
}

.toc-sticky-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.toc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.toc-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.toc-nav {
  max-height: calc(100vh - 200px);
  overflow-y: auto;
}

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

.toc-item {
  margin: 3px 0;
  position: relative;
}

.toc-level-2 {
  font-weight: 600;
  margin-top: 6px;
}

.toc-level-3 {
  padding-left: 14px;
  font-size: 0.825rem;
  font-weight: 400;
}

.toc-link {
  display: block;
  padding: 6px 10px;
  color: var(--color-text-muted);
  text-decoration: none !important;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
  line-height: 1.45;
  font-size: 0.85rem;
  word-break: break-word;
}

.toc-link:hover {
  color: var(--color-primary);
  background: var(--color-bg);
}

/* Active Highlight State for Scrollspy */
.toc-link.active {
  color: var(--color-primary);
  font-weight: 700;
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
  box-shadow: inset 0 0 0 1px rgba(2, 132, 199, 0.1);
}

/* Mobile & Tablet Adaptations */
@media (max-width: 1079px) {
  .article-sidebar {
    position: static;
    max-height: none;
    margin: 20px 0 32px;
    padding: 0;
  }
}

/* Reading Progress Bar */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, #0284c7 0%, #38bdf8 50%, #10b981 100%);
  z-index: 9999;
  transition: width 0.1s ease-out;
  pointer-events: none;
}

/* Floating Back to Top Button */
.back-to-top-btn {
  position: fixed;
  right: 28px;
  bottom: 32px;
  width: 44px;
  height: 44px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.15s ease, box-shadow 0.15s ease;
  z-index: 900;
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.35);
  transform: translateY(-2px);
}

/* Mobile TOC Floating Action Button & Drawer */
.mobile-toc-fab {
  display: none;
}

@media (max-width: 1079px) {
  .mobile-toc-fab {
    display: flex;
    align-items: center;
    gap: 6px;
    position: fixed;
    left: 20px;
    bottom: 32px;
    padding: 10px 18px;
    background: #0284c7;
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 700;
    border: none;
    border-radius: 9999px;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
    cursor: pointer;
    z-index: 900;
    transition: transform 0.15s ease;
  }
  .mobile-toc-fab:active {
    transform: scale(0.95);
  }
  .mobile-toc-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease;
    backdrop-filter: blur(2px);
  }
  .mobile-toc-drawer-overlay.active {
    opacity: 1;
    visibility: visible;
  }
  .mobile-toc-drawer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 75vh;
    background: #ffffff;
    border-radius: 20px 20px 0 0;
    padding: 24px 20px 32px;
    z-index: 1001;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
    box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.15);
  }
  .mobile-toc-drawer.active {
    transform: translateY(0);
  }
  .mobile-toc-drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
    margin-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
  }
  .mobile-toc-close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
  }
}

/* Pagination */
.pagination-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 40px 0;
  flex-wrap: wrap;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  background: var(--color-bg);
  text-decoration: none !important;
}

.page-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-btn.current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff !important;
  font-weight: 700;
}

/* FAQ Details/Summary Component */
.faq-accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 12px;
  background: var(--color-bg);
}

.faq-accordion summary {
  padding: 16px 20px;
  font-weight: 600;
  cursor: pointer;
  background: var(--color-surface);
  outline: none;
}

.faq-accordion summary:hover {
  color: var(--color-primary);
}

.faq-accordion-content {
  padding: 18px 20px;
  border-top: 1px solid var(--color-border);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 48px 0 32px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-keywords-desc {
  line-height: 1.7;
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.footer-disclosure-text {
  font-size: 0.8rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
}

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

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

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-actions {
    display: flex;
  }
  .menu-toggle {
    display: inline-block;
  }
  .main-nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
    border-top: 1px solid var(--color-border);
  }
  .main-nav.active {
    display: flex;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}