:root {
  --primary: #2563eb;
  --accent: #06b6d4;
  --bg: #f8fafc;
  --text: #0f172a;
  --text-light: #475569;
  --card-bg: #ffffff;
  --shadow-sm: 0 2px 8px rgba(37, 99, 235, 0.06);
  --shadow-md: 0 6px 24px rgba(37, 99, 235, 0.12);
  --shadow-lg: 0 12px 40px rgba(37, 99, 235, 0.18);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 滚动吸顶导航 */
.navbar-scroll {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(37, 99, 235, 0.08);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 14px 0;
}

.navbar-scroll.scrolled {
  background: rgba(248, 250, 252, 0.95);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.1);
  padding: 8px 0;
}

.navbar-brand {
  font-weight: 900;
  font-size: 1.6rem;
  color: var(--text) !important;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-brand .brand-icon {
  color: var(--primary);
  font-size: 1.4rem;
}

.nav-link {
  font-weight: 500;
  color: var(--text-light) !important;
  margin: 0 4px;
  padding: 6px 14px !important;
  border-radius: 8px;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.nav-link:hover {
  color: var(--primary) !important;
  background: rgba(37, 99, 235, 0.06);
}

.navbar-toggler {
  border: none;
  font-size: 1.3rem;
  color: var(--text);
}

.navbar-toggler:focus {
  box-shadow: none;
}

/* Hero 区 */
.hero-section {
  position: relative;
  padding: 100px 0 80px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  z-index: -1;
}

.glow-1 {
  width: 500px;
  height: 500px;
  background: rgba(37, 99, 235, 0.2);
  top: -120px;
  left: 10%;
}

.glow-2 {
  width: 400px;
  height: 400px;
  background: rgba(6, 182, 212, 0.18);
  bottom: -80px;
  right: 5%;
}

/* 滚动关键词标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.tag-cloud span {
  display: inline-block;
  padding: 8px 20px;
  background: var(--card-bg);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  animation: tagFloat 6s ease-in-out infinite;
  border: 1px solid rgba(37, 99, 235, 0.08);
}

.tag-cloud span:nth-child(odd) { animation-delay: 0.5s; }
.tag-cloud span:nth-child(3n) { animation-delay: 1.2s; }
.tag-cloud span:nth-child(4n) { animation-delay: 2s; }

@keyframes tagFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.tag-cloud span:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: var(--shadow-md);
  color: var(--primary);
  border-color: var(--primary);
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text) 30%, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 40px;
  font-weight: 400;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary-custom {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.35);
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary-custom:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.45);
  color: #fff;
}

.btn-outline-custom {
  background: transparent;
  color: var(--text);
  border: 2px solid rgba(37, 99, 235, 0.2);
  padding: 12px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-outline-custom:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* 区块通用 */
.section-padding {
  padding: 90px 0;
}

.section-label {
  display: inline-block;
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* 对比表格 */
.compare-wrapper {
  max-width: 880px;
  margin: 0 auto;
  position: relative;
}

.compare-card {
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: 24px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(37, 99, 235, 0.06);
}

.compare-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.compare-header {
  display: flex;
  align-items: center;
  padding: 20px 30px;
  border-bottom: 1px solid rgba(37, 99, 235, 0.06);
  gap: 14px;
}

.compare-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.compare-icon.yy {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.compare-icon.other {
  background: #e2e8f0;
  color: #64748b;
}

.compare-title {
  font-weight: 700;
  font-size: 1.15rem;
}

.compare-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
}

.compare-tag.win {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
}

.compare-tag.lose {
  background: #f1f5f9;
  color: #94a3b8;
}

.compare-body {
  padding: 20px 30px;
}

.compare-row {
  display: flex;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(37, 99, 235, 0.08);
  gap: 12px;
  font-size: 0.95rem;
}

.compare-row:last-child {
  border-bottom: none;
}

.compare-item-name {
  flex: 0 0 120px;
  font-weight: 600;
  color: var(--text-light);
  font-size: 0.85rem;
}

.compare-item-value {
  flex: 1;
}

.compare-item-value i {
  margin-right: 8px;
  font-size: 0.9rem;
}

.value-good { color: var(--primary); }
.value-bad { color: #94a3b8; }

/* 特色卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-top: 50px;
}

.feature-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(37, 99, 235, 0.05);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.feature-desc {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* 介绍编号清单 */
.intro-wrapper {
  max-width: 720px;
  margin: 0 auto;
}

.intro-list {
  list-style: none;
  counter-reset: intro-counter;
}

.intro-list li {
  counter-increment: intro-counter;
  position: relative;
  padding: 20px 0 20px 70px;
  border-bottom: 1px solid rgba(37, 99, 235, 0.08);
  transition: all 0.3s ease;
}

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

.intro-list li::before {
  content: counter(intro-counter);
  position: absolute;
  left: 0;
  top: 22px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.intro-list li:hover {
  transform: translateX(8px);
}

.intro-title {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.intro-text {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* FAQ 区 */
.faq-wrapper {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
  overflow: hidden;
  border: 1px solid rgba(37, 99, 235, 0.05);
  transition: all 0.3s ease;
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 22px 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: all 0.3s ease;
}

.faq-question i {
  color: var(--primary);
  transition: transform 0.3s ease;
  font-size: 0.9rem;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer-inner {
  padding: 0 28px 24px;
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* CTA 区 */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 24px;
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(37, 99, 235, 0.3);
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  top: -60px;
  right: -40px;
}

.cta-section::after {
  content: '';
  position: absolute;
  width: 150px;
  height: 150px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  bottom: -50px;
  left: -30px;
}

.cta-title {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-desc {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.05rem;
  max-width: 500px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 1;
}

.btn-cta {
  background: #fff;
  color: var(--primary);
  border: none;
  padding: 14px 44px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
  position: relative;
  z-index: 1;
}

.btn-cta:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  color: var(--text);
}

/* 友情链接 */
.friend-links {
  padding: 50px 0 30px;
  border-top: 1px solid rgba(37, 99, 235, 0.06);
}

.friend-links-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-light);
  text-align: center;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.friend-links-content {
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* 页脚 */
.footer {
  background: var(--text);
  color: #94a3b8;
  padding: 50px 0 30px;
  margin-top: 40px;
}

.footer-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand .brand-icon {
  color: var(--accent);
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 360px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  margin-top: 40px;
  text-align: center;
  font-size: 0.85rem;
}

/* 滚动渐显动画 */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-animate.delay-1 { transition-delay: 0.1s; }
.scroll-animate.delay-2 { transition-delay: 0.2s; }
.scroll-animate.delay-3 { transition-delay: 0.3s; }
.scroll-animate.delay-4 { transition-delay: 0.4s; }

/* 移动端适配 */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.4rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .hero-section {
    padding: 60px 0 50px;
  }
  
  .section-padding {
    padding: 60px 0;
  }
  
  .compare-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  
  .compare-item-name {
    flex: none;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-section {
    padding: 40px 24px;
  }
  
  .cta-title {
    font-size: 1.6rem;
  }
  
  .navbar-brand {
    font-size: 1.3rem;
  }
}

/* --- 子页面追加 --- */
/* 页面专属补充样式 —— 关于我们页特有元素 */
    .about-hero {
      background: linear-gradient(135deg, rgba(37,99,235,0.08) 0%, rgba(6,182,212,0.05) 100%);
      border-bottom: 1px solid rgba(37,99,235,0.08);
      padding: 80px 0 56px;
      position: relative;
      overflow: hidden;
    }
.about-hero::before {
      content: '';
      position: absolute;
      top: -60px;
      right: -40px;
      width: 260px;
      height: 260px;
      background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
.about-hero .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 16px;
      color: var(--text);
    }
.about-hero .hero-subtitle {
      font-size: 1.1rem;
      color: var(--text-light);
      max-width: 640px;
      margin-bottom: 8px;
      line-height: 1.7;
    }
.about-section {
      padding: 64px 0;
      border-bottom: 1px solid rgba(37,99,235,0.06);
    }
.about-section:last-of-type {
      border-bottom: none;
    }
.about-label {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 12px;
    }
.about-label i {
      font-size: 0.9rem;
    }
.about-h2 {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 20px;
      line-height: 1.3;
    }
.about-h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text);
      margin: 24px 0 12px;
    }
.about-body {
      font-size: 1rem;
      line-height: 1.8;
      color: var(--text-light);
    }
.about-body strong {
      color: var(--text);
      font-weight: 600;
    }
.about-card {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(37,99,235,0.06);
      height: 100%;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
.about-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
.about-card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
.about-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
.about-card p {
      font-size: 0.92rem;
      line-height: 1.7;
      color: var(--text-light);
      margin-bottom: 0;
    }
.about-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      margin: 36px 0 8px;
      padding: 24px 0;
      border-top: 1px solid rgba(37,99,235,0.08);
      border-bottom: 1px solid rgba(37,99,235,0.08);
    }
.about-stat-item {
      text-align: center;
      min-width: 100px;
    }
.about-stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
.about-stat-label {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-top: 4px;
    }
.about-quote {
      background: linear-gradient(135deg, rgba(37,99,235,0.05), rgba(6,182,212,0.04));
      border-left: 4px solid var(--primary);
      padding: 20px 24px;
      border-radius: 0 12px 12px 0;
      margin: 32px 0;
      font-style: italic;
      color: var(--text);
      font-weight: 500;
      line-height: 1.8;
    }
.about-timeline {
      list-style: none;
      padding-left: 0;
      margin: 24px 0;
    }
.about-timeline li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 18px;
      font-size: 0.95rem;
      color: var(--text-light);
      line-height: 1.7;
    }
.about-timeline li::before {
      content: '\f058';
      font-family: 'Font Awesome 6 Free';
      font-weight: 900;
      position: absolute;
      left: 0;
      top: 2px;
      color: var(--primary);
      font-size: 0.95rem;
    }
.about-timeline li strong {
      color: var(--text);
      font-weight: 600;
    }
.about-list {
      padding-left: 0;
      list-style: none;
      margin: 16px 0;
    }
.about-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 10px;
      font-size: 0.95rem;
      color: var(--text-light);
      line-height: 1.7;
    }
.about-list li::before {
      content: '\f105';
      font-family: 'Font Awesome 6 Free';
      font-weight: 900;
      position: absolute;
      left: 4px;
      top: 1px;
      color: var(--accent);
      font-size: 0.85rem;
    }
.about-list li strong {
      color: var(--text);
      font-weight: 600;
    }
.about-link {
      color: var(--primary);
      font-weight: 500;
      text-decoration: none;
      border-bottom: 1px dashed rgba(37,99,235,0.3);
      transition: border-color 0.2s, color 0.2s;
    }
.about-link:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
.about-hero { padding: 56px 0 40px; }
.about-hero .hero-title { font-size: 1.8rem; }
.about-h2 { font-size: 1.4rem; }
.about-stats { gap: 24px; }
.about-stat-num { font-size: 1.5rem; }

/* --- 子页面追加 --- */
.disclaimer-content {
      max-width: 860px;
      margin: 0 auto;
    }
.disclaimer-section {
      margin-bottom: 2.5rem;
    }
.disclaimer-section h2 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 1rem;
      padding-left: 1rem;
      border-left: 4px solid var(--primary);
    }
.disclaimer-section p {
      color: var(--text-light);
      line-height: 1.8;
      margin-bottom: 1rem;
    }
.disclaimer-section ul {
      color: var(--text-light);
      line-height: 1.8;
      padding-left: 1.5rem;
    }
.disclaimer-section li {
      margin-bottom: 0.5rem;
    }
.highlight-box {
      background: var(--card-bg);
      border-radius: 12px;
      padding: 1.5rem;
      box-shadow: var(--shadow-sm);
      margin: 1.5rem 0;
      border-left: 4px solid var(--accent);
    }
.last-updated {
      display: inline-block;
      padding: 0.4rem 1rem;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 2rem;
    }

/* --- 子页面追加 --- */
/* 确保卡片、表单等 Bootstrap 组件与站点浅色主题一致 */
    .card, .card-body, .card-title, .card-text, .card-header, .card-footer,
    .form-control, .form-select, .form-label, .input-group-text,
    .table, .list-group-item, .accordion-item, .accordion-button, .accordion-body,
    .modal-content, .modal-header, .modal-body, .dropdown-menu, .dropdown-item,
    .nav-link, .navbar, .navbar-brand, .btn-light, .btn-outline-* {
      background: var(--card-bg);
      color: var(--text);
      border-color: #e2e8f0;
    }
.accordion-button:not(.collapsed) {
      background: rgba(37, 99, 235, 0.05);
      color: var(--primary);
    }
.form-control::placeholder {
      color: #94a3b8;
    }
/* 隐私页特殊样式：让标题更有呼吸感 */
    .privacy-section {
      background-color: var(--bg);
    }
.privacy-card {
      background: var(--card-bg);
      border-radius: 1rem;
      box-shadow: var(--shadow-sm);
      padding: 2rem 2rem 2rem 2rem;
      transition: box-shadow 0.2s ease;
      border: 1px solid #f1f5f9;
    }
.privacy-card:hover {
      box-shadow: var(--shadow-md);
    }
.privacy-icon {
      color: var(--primary);
      background: rgba(37, 99, 235, 0.08);
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      margin-bottom: 1.2rem;
    }
.privacy-icon i {
      font-size: 1.5rem;
    }
.privacy-list {
      list-style: none;
      padding-left: 0;
    }
.privacy-list li {
      padding: 0.4rem 0 0.4rem 1.8rem;
      position: relative;
      color: var(--text-light);
    }
.privacy-list li::before {
      content: "\f058";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      position: absolute;
      left: 0;
      color: var(--primary);
      opacity: 0.7;
    }
.privacy-highlight {
      background: rgba(6, 182, 212, 0.06);
      border-left: 4px solid var(--accent);
      padding: 1.2rem 1.5rem;
      border-radius: 0 12px 12px 0;
      margin: 1.5rem 0;
    }
.privacy-highlight p {
      margin-bottom: 0;
    }
/* 导航栏高亮当前页 */
    .navbar-nav .nav-link.active-privacy {
      color: var(--primary) !important;
      font-weight: 600;
    }

/* --- 子页面追加 --- */
/* 阅读指南专属样式 */
        .guide-section {
            padding: 80px 0;
        }
.guide-step-card {
            background: var(--card-bg);
            border-radius: 16px;
            padding: 32px;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            border: 1px solid rgba(37, 99, 235, 0.08);
        }
.guide-step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
.guide-step-num {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
        }
.guide-step-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
.guide-step-desc {
            color: var(--text-light);
            line-height: 1.7;
            font-size: 15px;
        }
.guide-step-desc strong {
            color: var(--primary);
            font-weight: 600;
        }
.guide-tip-box {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(6, 182, 212, 0.05));
            border-left: 4px solid var(--primary);
            padding: 24px;
            border-radius: 0 12px 12px 0;
            margin: 32px 0;
        }
.guide-tip-box i {
            color: var(--primary);
            margin-right: 8px;
        }
.guide-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid rgba(37, 99, 235, 0.08);
        }
.guide-feature-item:last-child {
            border-bottom: none;
        }
.guide-feature-icon {
            width: 44px;
            height: 44px;
            min-width: 44px;
            border-radius: 10px;
            background: rgba(37, 99, 235, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 18px;
        }
.guide-feature-content h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
        }
.guide-feature-content p {
            font-size: 14px;
            color: var(--text-light);
            margin: 0;
            line-height: 1.6;
        }
.guide-hero {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(6, 182, 212, 0.06));
            padding: 80px 0;
            border-bottom: 1px solid rgba(37, 99, 235, 0.1);
        }
.guide-hero-title {
            font-size: 42px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.03em;
            margin-bottom: 16px;
        }
.guide-hero-title span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
.guide-hero-subtitle {
            font-size: 18px;
            color: var(--text-light);
            max-width: 720px;
            margin: 0 auto;
            line-height: 1.7;
        }
.guide-table-of-content {
            background: var(--card-bg);
            border-radius: 16px;
            padding: 32px;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(37, 99, 235, 0.08);
            margin-top: -40px;
            position: relative;
            z-index: 10;
        }
.guide-toc-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
.guide-toc-title i {
            color: var(--primary);
        }
.guide-toc-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 12px;
        }
.guide-toc-list li a {
            color: var(--text-light);
            text-decoration: none;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
.guide-toc-list li a:hover {
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
        }
.guide-toc-list li a i {
            font-size: 12px;
            color: var(--accent);
        }
.guide-quick-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin-top: 32px;
        }
.guide-quick-link {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            border: 1px solid rgba(37, 99, 235, 0.08);
            text-decoration: none;
        }
.guide-quick-link:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
.guide-quick-link i {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }
.guide-quick-link span {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
        }
.guide-hero-title {
                font-size: 32px;
            }
.guide-hero-subtitle {
                font-size: 16px;
            }
.guide-step-card {
                padding: 24px;
                margin-bottom: 16px;
            }
.guide-table-of-content {
                padding: 20px;
                margin-top: -20px;
            }

/* --- 子页面追加 --- */
/* 联系页特有样式，与站点风格无缝融合 */
    .contact-hero {
      background: linear-gradient(135deg, rgba(37,99,235,0.05) 0%, rgba(6,182,212,0.05) 100%);
      border-bottom: 1px solid rgba(37,99,235,0.1);
    }
.contact-card {
      background: var(--card-bg);
      border-radius: 20px;
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.25s ease, transform 0.2s;
      height: 100%;
      border: 1px solid rgba(37,99,235,0.08);
    }
.contact-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
.contact-icon {
      width: 52px;
      height: 52px;
      background: rgba(37,99,235,0.08);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.7rem;
      color: var(--primary);
      margin-bottom: 1.3rem;
    }
.contact-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
      letter-spacing: -0.01em;
      margin-bottom: 0.6rem;
    }
.contact-card p {
      color: var(--text-light);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 0.4rem;
    }
.contact-card a {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
      border-bottom: 1px dotted rgba(37,99,235,0.3);
    }
.contact-card a:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
.social-links a {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: rgba(37,99,235,0.06);
      color: var(--primary);
      margin-right: 0.6rem;
      transition: 0.2s;
      border: 1px solid rgba(37,99,235,0.08);
    }
.social-links a:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
.form-label {
      font-weight: 600;
      color: var(--text);
      font-size: 0.9rem;
      margin-bottom: 0.4rem;
    }
.form-control, .form-select {
      background: rgba(255,255,255,0.7);
      border: 1px solid rgba(37,99,235,0.15);
      border-radius: 14px;
      padding: 0.75rem 1rem;
      font-size: 0.95rem;
      color: var(--text);
      box-shadow: none;
    }
.form-control:focus, .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 0.18rem rgba(37,99,235,0.1);
      background: #fff;
    }
.btn-contact-submit {
      background: var(--primary);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: 40px;
      transition: 0.2s;
      box-shadow: 0 6px 16px rgba(37,99,235,0.2);
    }
.btn-contact-submit:hover {
      background: var(--accent);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(6,182,212,0.25);
    }
.info-item {
      display: flex;
      gap: 0.9rem;
      margin-bottom: 1.4rem;
    }
.info-item i {
      font-size: 1.2rem;
      color: var(--primary);
      margin-top: 0.2rem;
      width: 24px;
    }
.info-item span {
      color: var(--text-light);
      font-size: 0.95rem;
    }
.contact-faq-item {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 1.2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      margin-bottom: 1rem;
      border-left: 4px solid var(--primary);
    }
.contact-faq-item h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 0.3rem;
    }
.contact-faq-item p {
      font-size: 0.9rem;
      color: var(--text-light);
      margin: 0;
    }
.divider-light {
      border-top: 1px solid rgba(37,99,235,0.08);
      margin: 1.5rem 0;
    }

/* --- 子页面追加 --- */
/* 排行榜页面专属样式 */
    .ranking-hero {
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(6, 182, 212, 0.08));
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
    }
.ranking-hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.06), transparent 70%);
      border-radius: 50%;
    }
.ranking-tabs {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-bottom: 30px;
    }
.ranking-tab {
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.95rem;
      background: var(--card-bg);
      color: var(--text-light);
      border: 2px solid transparent;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
.ranking-tab:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
.ranking-tab.active {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
.rank-item {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 20px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid rgba(37, 99, 235, 0.06);
    }
.rank-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
.rank-number {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      min-width: 60px;
      text-align: center;
      opacity: 0.8;
    }
.rank-item:nth-child(1) .rank-number { color: #f59e0b; opacity: 1; }
.rank-item:nth-child(2) .rank-number { color: #94a3b8; opacity: 1; }
.rank-item:nth-child(3) .rank-number { color: #d97706; opacity: 1; }
.rank-cover {
      width: 72px;
      height: 96px;
      border-radius: 8px;
      overflow: hidden;
      flex-shrink: 0;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.5rem;
    }
.rank-info {
      flex: 1;
    }
.rank-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 4px;
    }
.rank-desc {
      font-size: 0.9rem;
      color: var(--text-light);
      margin-bottom: 8px;
    }
.rank-meta {
      display: flex;
      gap: 16px;
      font-size: 0.8rem;
      color: var(--text-light);
    }
.rank-meta span {
      display: flex;
      align-items: center;
      gap: 5px;
    }
.rank-meta i {
      color: var(--primary);
    }
.trend-up { color: #10b981; }
.trend-down { color: #ef4444; }
.trend-same { color: #f59e0b; }
.badge-new {
      background: var(--accent);
      color: #fff;
      font-size: 0.7rem;
      padding: 3px 10px;
      border-radius: 20px;
      font-weight: 600;
    }
.badge-hot {
      background: #f59e0b;
      color: #fff;
      font-size: 0.7rem;
      padding: 3px 10px;
      border-radius: 20px;
      font-weight: 600;
    }
.genre-tag {
      display: inline-block;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      padding: 3px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 500;
      margin-right: 6px;
    }
.section-subtitle {
      color: var(--text-light);
      font-size: 1.1rem;
      margin-bottom: 40px;
      max-width: 600px;
    }
.editor-pick-card {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 28px;
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(37, 99, 235, 0.08);
      height: 100%;
      transition: all 0.3s ease;
    }
.editor-pick-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
.editor-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
.editor-quote {
      font-style: italic;
      color: var(--text-light);
      border-left: 3px solid var(--primary);
      padding-left: 16px;
      margin: 16px 0;
    }
.trending-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
      border-radius: 12px;
      padding: 12px 20px;
      margin: 8px;
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--text);
      transition: all 0.3s ease;
      cursor: pointer;
    }
.trending-tag:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }
.trending-tag i {
      color: var(--primary);
    }