/* ===========================================================
   天伦之乐 - 试管婴儿知识平台
   主题：专业试管婴儿知识 | 助您实现为人父母的梦想
   Design: Modern, Clean, Trustworthy
   =========================================================== */

/* ----- CSS Variables ----- */
:root {
  --color-primary: #e74c7c;
  --color-primary-dark: #c0392b;
  --color-primary-light: #f9e0e8;
  --color-secondary: #3498db;
  --color-accent: #27ae60;
  --color-gold: #f39c12;
  --color-ink: #1F1F1F;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-paper: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-pink: #fef5f8;
  --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ----- Reset & Base ----- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-primary); text-decoration: none; transition: all .3s ease; }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; border: none; }
h1, h2, h3, h4, h5, h6 { 
  margin: 0 0 .5em; 
  line-height: 1.4; 
  font-weight: 600;
  color: var(--color-ink);
}
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.5em; }

/* ----- Container ----- */
.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ----- Header ----- */
.site-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #e91e63 100%);
  color: #fff;
  box-shadow: var(--shadow-medium);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 70px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo a {
  color: #fff;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 2px;
}

.site-logo a:hover { color: #fff; opacity: 0.9; }

.site-logo .logo-icon {
  width: 46px; height: 46px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  color: #fff;
}

.logo-subtitle {
  font-size: 12px;
  color: rgba(255,255,255,0.9);
  letter-spacing: 2px;
  margin-top: 2px;
}

.main-nav { display: flex; gap: 6px; flex-wrap: wrap; }

.main-nav a {
  color: rgba(255,255,255,.95);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  transition: all .3s ease;
}

.main-nav a:hover {
  color: #fff;
  background: rgba(255,255,255,.2);
}

/* ----- Hero Section (Homepage) ----- */
.hero {
  background: linear-gradient(135deg, var(--color-bg-pink) 0%, #fff 50%, var(--color-primary-light) 100%);
  color: var(--color-ink);
  padding: 60px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(231,76,124,0.05) 0%, transparent 70%);
  animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 42px;
  margin: 0 0 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.hero h1 span {
  color: var(--color-primary);
}

.hero .subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ----- Quick Guide Section ----- */
.quick-guide {
  padding: 60px 0;
  background: var(--color-bg-light);
}

.section-title {
  text-align: center;
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 40px;
  color: var(--color-ink);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.guide-card {
  background: #fff;
  padding: 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.guide-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.guide-card .icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.guide-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--color-ink);
}

.guide-card p {
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

.card-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--color-primary);
  font-weight: 500;
}

/* ----- Process Section ----- */
.process-section {
  padding: 60px 0;
  background: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-header h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--color-text-light);
}

.process-timeline {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.process-step {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
  padding: 24px;
  background: var(--color-bg-light);
  border-radius: var(--radius-lg);
  transition: background 0.3s ease;
}

.process-step:hover {
  background: var(--color-primary-light);
}

.step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}

.step-content h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.step-content p {
  color: var(--color-text-light);
  font-size: 15px;
  margin: 0;
}

/* ----- Breadcrumb ----- */
.breadcrumb {
  background: var(--color-bg-light);
  border-bottom: 1px solid #eee;
  padding: 12px 0;
  font-size: 14px;
  color: var(--color-text-light);
}

.breadcrumb .wrapper { display: flex; align-items: center; gap: 8px; }
.breadcrumb a { color: var(--color-primary); }
.breadcrumb a:hover { color: var(--color-primary-dark); }
.breadcrumb .sep { color: #ccc; margin: 0 4px; }
.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ----- Content Area ----- */
.content-area {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
}

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

.content-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ----- Main Content Box ----- */
.main-box {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  padding: 30px;
}

.main-box h1.page-title {
  font-size: 26px;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 16px;
  margin-bottom: 24px;
  position: relative;
}

.main-box h1.page-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 80px;
  height: 2px;
  background: var(--color-primary);
}

.main-box h2 { color: var(--color-ink); font-size: 22px; margin-top: 32px; }
.main-box h3 { color: var(--color-primary); font-size: 18px; margin-top: 24px; }

/* ----- Article List ----- */
.article-list { list-style: none; padding: 0; margin: 0; }

.article-list li {
  padding: 20px 0;
  border-bottom: 1px solid #eee;
  transition: all .3s ease;
}

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

.article-list li:hover {
  padding-left: 12px;
}

.article-list .article-title {
  font-size: 18px; font-weight: 600; margin: 0 0 10px;
}

.article-list .article-title a { color: var(--color-ink); }
.article-list .article-title a:hover { color: var(--color-primary); }

.article-list .article-meta {
  font-size: 13px; color: var(--color-text-muted); margin: 0 0 10px; display: flex; gap: 16px; flex-wrap: wrap;
}

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

.article-list .article-summary {
  font-size: 15px; color: var(--color-text-light); line-height: 1.7; margin: 0;
}

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

.article-content p { margin: 0 0 1.2em; }

.article-content h3 {
  font-size: 20px;
  color: var(--color-ink);
  border-left: 4px solid var(--color-primary);
  padding-left: 16px;
  margin: 32px 0 16px;
}

.article-content h4 {
  font-size: 17px;
  color: var(--color-primary);
  margin: 24px 0 12px;
}

.article-content ul, .article-content ol { margin: 0 0 1.2em; }
.article-content li { margin-bottom: 8px; }
.article-content strong { color: var(--color-ink); }

.article-content blockquote {
  margin: 20px 0;
  padding: 16px 24px;
  background: var(--color-bg-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text);
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 16px 0;
}

.article-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #eee;
}

.article-header h1 {
  font-size: 26px; 
  color: var(--color-ink); 
  margin: 0 0 12px;
  line-height: 1.4;
}

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

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

/* ----- Sidebar Box ----- */
.sidebar-box {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  padding: 24px;
}

.sidebar-box h3 {
  font-size: 17px; 
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 12px; 
  margin-bottom: 16px;
  position: relative;
}

.sidebar-box h3::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--color-primary);
}

.sidebar-box ul {
  list-style: none; padding: 0; margin: 0;
}

.sidebar-box li {
  padding: 10px 0; 
  border-bottom: 1px dashed #eee;
}

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

.sidebar-box li a {
  font-size: 15px; color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-box li a::before {
  content: '◆';
  font-size: 10px;
  color: var(--color-primary);
}

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

.sidebar-box p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin: 0;
}

/* Highlight Box */
.highlight-box {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #fff 100%);
  border-left: 4px solid var(--color-primary);
}

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

.checklist li {
  padding: 8px 0;
  border-bottom: none;
  color: var(--color-text);
  font-size: 15px;
}

/* FAQ Box */
.faq-box dt {
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 12px;
  cursor: pointer;
  font-size: 15px;
}

.faq-box dd {
  color: var(--color-text-light);
  font-size: 14px;
  margin: 6px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--color-primary-light);
  line-height: 1.6;
}

/* Related Articles */
.related-articles {
  margin-top: 24px;
  padding: 20px;
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
}

.related-articles h3 {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--color-ink);
}

.related-articles ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.related-articles li {
  padding: 8px 0;
  border-bottom: 1px dashed #ddd;
}

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

/* ----- Pagination ----- */
.pagination {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid #eee;
  display: flex; gap: 10px; flex-wrap: wrap;
  justify-content: center;
}

.pagination a, .pagination span, .pagination strong {
  display: inline-block; padding: 8px 16px;
  border: 1px solid #ddd; border-radius: var(--radius-sm);
  font-size: 14px; color: var(--color-text); transition: all .3s ease;
  min-width: 40px;
  text-align: center;
}

.pagination a:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.pagination strong, .pagination .current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ----- Tag List ----- */
.tag-list { 
  display: flex; 
  gap: 10px; 
  flex-wrap: wrap; 
  margin: 24px 0; 
}

.tag-list a {
  display: inline-block; 
  padding: 6px 14px;
  background: var(--color-bg-light); 
  color: var(--color-text-light); 
  border-radius: 20px;
  font-size: 13px;
  transition: all .3s ease;
}

.tag-list a:hover { 
  background: var(--color-primary); 
  color: #fff; 
}

/* ----- Digg / Rating ----- */
.digg-box { 
  margin: 24px 0; 
  text-align: center;
  padding: 20px;
  background: var(--color-bg-light);
  border-radius: var(--radius-lg);
}

/* ----- Section Divider ----- */
.section-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin: 40px 0;
  color: var(--color-primary);
}

.section-divider span {
  font-size: 20px;
}

/* ----- Category Navigation ----- */
.category-nav {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.category-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  transition: all .3s ease;
}

.category-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-light);
  color: var(--color-primary);
  background: #fff;
}

.category-icon {
  color: var(--color-primary);
}

/* ----- CTA Section ----- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #e91e63 100%);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

.cta-section h2 {
  font-size: 28px;
  color: #fff;
  margin-bottom: 12px;
}

.cta-section p {
  font-size: 16px;
  opacity: .9;
  max-width: 600px;
  margin: 0 auto 24px;
}

.cta-button {
  display: inline-block;
  padding: 14px 36px;
  background: #fff;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
  border-radius: 30px;
  transition: all .3s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  color: var(--color-primary-dark);
}

/* ----- Footer ----- */
.site-footer {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 50px 20px 0;
  margin-top: 60px;
}

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

.footer-brand h4 {
  color: #fff; 
  font-size: 22px; 
  margin: 0 0 12px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin: 0;
}

.footer-col h4 {
  color: #fff; 
  font-size: 15px; 
  margin: 0 0 16px;
  font-weight: 600;
}

.footer-col nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.15);
  padding: 20px;
  text-align: center; 
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}

.disclaimer {
  margin-top: 8px;
  font-size: 12px;
  opacity: 0.7;
}

/* ----- Visually Hidden ----- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----- Responsive ----- */
@media (max-width: 992px) {
  .content-area {
    grid-template-columns: 1fr;
  }
  
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .header-inner { 
    height: auto; 
    padding: 16px; 
    flex-direction: column; 
    gap: 16px; 
  }
  
  .main-nav { 
    gap: 6px; 
    width: 100%; 
    justify-content: center; 
  }
  
  .main-nav a { 
    font-size: 14px; 
    padding: 8px 12px; 
  }
  
  .hero { padding: 40px 16px; }
  
  .hero h1 { font-size: 28px; }
  
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .process-step {
    flex-direction: column;
    text-align: center;
  }
  
  .main-box { padding: 20px; }
  
  .footer-inner { 
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-col nav {
    align-items: center;
  }
  
  .cta-section { padding: 40px 16px; }
  .cta-section h2 { font-size: 24px; }
}

@media (max-width: 480px) {
  .site-logo a { font-size: 22px; }
  
  .hero h1 { font-size: 24px; }
  
  .section-title { font-size: 22px; }
  
  .guide-grid {
    grid-template-columns: 1fr;
  }
  
  .article-list .article-title { font-size: 16px; }
  
  .main-box { padding: 16px; }
  
  .sidebar-box { padding: 16px; }
}

/* ----- Print Styles ----- */
@media print {
  .site-header, .site-footer, .cta-section, .content-sidebar, .breadcrumb, .digg-box {
    display: none;
  }
  
  .content-area {
    margin: 0;
    padding: 0;
    display: block;
  }
  
  .main-box {
    box-shadow: none;
    border: none;
    padding: 0;
  }
  
  body {
    background: #fff;
    color: #000;
  }
}