:root {
  --primary: #64748b;
  --accent: #94a3b8;
  --bg: #f1f5f9;
  --text: #1e293b;
  --white: #ffffff;
  --border-dark: #1e293b;
  --shadow-hard: 6px 6px 0 0 #1e293b;
  --shadow-hard-sm: 4px 4px 0 0 #1e293b;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  letter-spacing: -0.02em;
}

.mono {
  font-family: 'Courier New', Courier, monospace;
  font-weight: 600;
}

/* 导航栏 */
.navbar-custom {
  background: rgba(241, 245, 249, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 3px solid var(--border-dark);
  padding: 0.75rem 1.5rem;
  transition: all 0.3s ease;
  z-index: 1030;
}

.navbar-custom.scrolled {
  background: rgba(241, 245, 249, 0.98);
  box-shadow: 0 4px 0 0 var(--border-dark);
}

.navbar-brand {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text) !important;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border: 3px solid var(--border-dark);
  padding: 0.3rem 1rem;
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
}

.navbar-brand:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--border-dark);
}

.navbar-brand i {
  margin-right: 8px;
  font-size: 1.4rem;
}

.navbar-custom .nav-link {
  font-weight: 700;
  color: var(--text);
  margin: 0 0.3rem;
  padding: 0.5rem 0.8rem;
  border: 2px solid transparent;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.navbar-custom .nav-link:hover {
  border: 2px solid var(--border-dark);
  background: var(--white);
  box-shadow: var(--shadow-hard-sm);
}

.navbar-toggler {
  border: 2px solid var(--border-dark);
  border-radius: 0;
  padding: 0.25rem 0.5rem;
}

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

/* Hero */
.hero-section {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url('{随机图片}');
  background-size: cover;
  background-position: center;
  border-bottom: 4px solid var(--border-dark);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(30, 41, 59, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-content {
  text-align: center;
  color: var(--white);
  padding: 3rem 1.5rem;
  max-width: 900px;
  border: 3px solid var(--white);
  background: rgba(30, 41, 59, 0.35);
  box-shadow: 10px 10px 0 0 var(--accent);
}

.hero-content h1 {
  font-size: 3.8rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.03em;
  margin-bottom: 0.8rem;
  line-height: 1.1;
  text-shadow: 4px 4px 0 var(--border-dark);
}

.hero-content p.lead {
  font-size: 1.25rem;
  font-weight: 400;
  opacity: 0.95;
  margin-bottom: 1.2rem;
}

.hero-btn {
  display: inline-block;
  background: var(--white);
  color: var(--text);
  font-weight: 800;
  padding: 0.9rem 2.5rem;
  border: 3px solid var(--border-dark);
  box-shadow: var(--shadow-hard);
  text-decoration: none;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.15s;
}

.hero-btn:hover {
  background: var(--accent);
  color: var(--text);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 0 var(--border-dark);
  color: var(--white);
}

/* 区块通用 */
.section-block {
  padding: 4rem 0;
  border-bottom: 3px solid var(--border-dark);
}

.section-title-wrap {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  display: inline-block;
  background: var(--white);
  border: 3px solid var(--border-dark);
  padding: 0.5rem 1.5rem;
  box-shadow: var(--shadow-hard);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  right: -1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  background: var(--accent);
  border: 2px solid var(--border-dark);
}

/* 数据统计 */
.stats-section {
  background: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 3px solid var(--border-dark);
  box-shadow: var(--shadow-hard);
}

.stat-cell {
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--white);
  border-right: 2px solid var(--border-dark);
  transition: background 0.3s;
}

.stat-cell:last-child {
  border-right: none;
}

.stat-cell:hover {
  background: var(--bg);
}

.stat-number {
  font-family: 'Courier New', monospace;
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-top: 0.3rem;
}

/* 步骤条 */
.steps-wrapper {
  display: flex;
  gap: 0;
  border: 3px solid var(--border-dark);
  box-shadow: var(--shadow-hard);
  background: var(--white);
}

.step-item {
  flex: 1;
  padding: 2rem 1.2rem;
  position: relative;
  border-right: 2px solid var(--border-dark);
  background: var(--white);
  transition: background 0.2s;
}

.step-item:last-child {
  border-right: none;
}

.step-item:hover {
  background: var(--bg);
}

.step-num {
  font-family: 'Courier New', monospace;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
  margin-bottom: 0.6rem;
  border-bottom: 3px solid var(--border-dark);
  padding-bottom: 0.5rem;
}

.step-title {
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.step-desc {
  font-size: 0.9rem;
  opacity: 0.85;
}

/* 特色卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.feature-card {
  background: var(--white);
  border: 3px solid var(--border-dark);
  box-shadow: var(--shadow-hard);
  padding: 1.8rem 1.5rem;
  position: relative;
  transition: all 0.25s ease;
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.reveal {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:nth-child(2) {
  transition-delay: 0.12s;
}

.feature-card:nth-child(3) {
  transition-delay: 0.24s;
}

.feature-card:nth-child(4) {
  transition-delay: 0.1s;
}

.feature-card:nth-child(5) {
  transition-delay: 0.2s;
}

.feature-card:nth-child(6) {
  transition-delay: 0.3s;
}

.feature-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 0 var(--border-dark);
}

.feature-icon {
  font-size: 2.2rem;
  color: var(--primary);
  margin-bottom: 0.8rem;
}

.feature-card h4 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
}

.feature-card p {
  font-size: 0.92rem;
  opacity: 0.9;
}

.feature-img-wrap {
  overflow: hidden;
  border: 2px solid var(--border-dark);
  margin-bottom: 1rem;
  position: relative;
}

.feature-img-wrap img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.feature-card:hover .feature-img-wrap img {
  transform: scale(1.08);
}

.img-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(30, 41, 59, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.feature-card:hover .img-overlay {
  opacity: 1;
}

/* FAQ */
.faq-section {
  background: var(--white);
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
  border: 3px solid var(--border-dark);
  box-shadow: var(--shadow-hard);
  background: var(--bg);
}

.faq-item {
  border-bottom: 2px solid var(--border-dark);
  padding: 1.2rem 1.8rem;
  cursor: pointer;
  transition: background 0.2s;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item:hover {
  background: var(--white);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 1.05rem;
}

.faq-question i {
  font-size: 1.2rem;
  transition: transform 0.3s;
  color: var(--primary);
}

.faq-item.open .faq-question i {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  font-size: 0.95rem;
  opacity: 0.9;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding-top: 0.8rem;
}

/* CTA */
.cta-section {
  background: var(--text);
  color: var(--white);
  padding: 5rem 0;
  text-align: center;
  border-bottom: 4px solid var(--border-dark);
}

.cta-section h2 {
  font-size: 2.8rem;
  font-weight: 900;
  text-transform: uppercase;
  margin-bottom: 1rem;
  text-shadow: 4px 4px 0 var(--primary);
}

.cta-section p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.cta-btn {
  display: inline-block;
  background: var(--white);
  color: var(--text);
  font-weight: 800;
  padding: 1rem 3rem;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-hard);
  font-size: 1.1rem;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.cta-btn:hover {
  background: var(--accent);
  color: var(--white);
  transform: translate(-3px, -3px);
  box-shadow: 10px 10px 0 0 rgba(255, 255, 255, 0.3);
}

/* 友情链接 */
.friend-links {
  background: var(--bg);
  padding: 3rem 0;
  border-bottom: 3px solid var(--border-dark);
}

.friend-title {
  font-size: 1.2rem;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
}

.friend-title i {
  margin-right: 0.6rem;
  color: var(--primary);
}

.friend-links-content {
  font-size: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

/* Footer */
.footer {
  background: var(--text);
  color: var(--bg);
  padding: 3rem 0;
  text-align: center;
  border-top: 4px solid var(--accent);
}

.footer .brand {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--white);
  margin-bottom: 0.5rem;
  display: inline-block;
  border: 2px solid var(--accent);
  padding: 0.3rem 1.2rem;
}

.footer p {
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
  opacity: 0.8;
}

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

.footer .footer-links a {
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.2rem;
  transition: border-color 0.2s;
}

.footer .footer-links a:hover {
  border-bottom-color: var(--accent);
}

/* 双色块左右分屏 */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 3px solid var(--border-dark);
}

.split-left {
  background: var(--primary);
  color: var(--white);
  padding: 4rem 3rem;
  border-right: 3px solid var(--border-dark);
}

.split-right {
  background: var(--white);
  padding: 4rem 3rem;
}

/* 响应式 */
@media (max-width: 991px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-cell:nth-child(2) {
    border-right: none;
  }
  .stat-cell:nth-child(-n+2) {
    border-bottom: 2px solid var(--border-dark);
  }
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
  .steps-wrapper {
    flex-direction: column;
  }
  .step-item {
    border-right: none;
    border-bottom: 2px solid var(--border-dark);
  }
  .step-item:last-child {
    border-bottom: none;
  }
  .split-section {
    grid-template-columns: 1fr;
  }
  .split-left {
    border-right: none;
    border-bottom: 3px solid var(--border-dark);
  }
}

@media (max-width: 767px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .hero-content h1 {
    font-size: 2.5rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .navbar-brand {
    font-size: 1.3rem;
  }
}

/* 滚动渐显 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 图片占位背景 */
.img-placeholder {
  background: var(--accent);
}

/* --- 子页面追加 --- */
/* 本页专属样式 - 覆盖Bootstrap组件配色，保持站点风格 */
    .card, .card-body, .card-title, .card-text {
      background: var(--white);
      color: var(--text);
      border-color: var(--border-dark);
    }
.navbar-custom .nav-link:hover,
    .navbar-custom .nav-link.active {
      color: var(--primary);
    }
.navbar-custom .navbar-brand {
      color: var(--text);
      font-weight: 800;
    }
.about-hero {
      background: var(--bg);
      border-bottom: 2px solid var(--border-dark);
      padding: 100px 0 80px;
      position: relative;
    }
.about-hero h1 {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--text);
      line-height: 1.2;
      margin-bottom: 20px;
    }
.about-hero .lead {
      font-size: 1.2rem;
      color: var(--text);
      opacity: 0.8;
      max-width: 700px;
    }
.about-content {
      background: var(--white);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard);
      padding: 40px;
      margin-bottom: 40px;
      border-radius: 0;
    }
.about-content h2 {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
.about-content h2 i {
      color: var(--primary);
      font-size: 1.3rem;
    }
.about-content p {
      color: var(--text);
      line-height: 1.8;
      font-size: 1rem;
      margin-bottom: 16px;
    }
.about-content ul {
      color: var(--text);
      line-height: 2;
      padding-left: 20px;
      margin-bottom: 16px;
    }
.about-content ul li::marker {
      color: var(--primary);
    }
.feature-mini-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
.feature-mini-item {
      background: var(--bg);
      border: 2px solid var(--border-dark);
      padding: 24px;
      transition: box-shadow 0.3s ease, transform 0.3s ease;
    }
.feature-mini-item:hover {
      box-shadow: var(--shadow-hard-sm);
      transform: translate(-2px, -2px);
    }
.feature-mini-item i {
      font-size: 1.8rem;
      color: var(--primary);
      margin-bottom: 12px;
      display: block;
    }
.feature-mini-item h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 10px;
    }
.feature-mini-item p {
      font-size: 0.9rem;
      color: var(--text);
      opacity: 0.8;
      line-height: 1.6;
      margin: 0;
    }
.stats-about {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
.stats-about .stat-item {
      background: var(--white);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard-sm);
      padding: 20px;
      text-align: center;
    }
.stats-about .stat-item .num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      font-family: 'monospace', monospace;
    }
.stats-about .stat-item .label {
      font-size: 0.9rem;
      color: var(--text);
      opacity: 0.7;
      margin-top: 8px;
      display: block;
    }
.timeline {
      position: relative;
      padding-left: 30px;
      margin-top: 20px;
    }
.timeline::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 3px;
      background: var(--primary);
      opacity: 0.3;
    }
.timeline-item {
      position: relative;
      padding-bottom: 24px;
    }
.timeline-item::before {
      content: '';
      position: absolute;
      left: -34px;
      top: 5px;
      width: 14px;
      height: 14px;
      background: var(--white);
      border: 3px solid var(--primary);
      border-radius: 50%;
    }
.timeline-item .year {
      font-family: 'monospace', monospace;
      font-weight: 700;
      color: var(--primary);
      font-size: 0.95rem;
      display: block;
      margin-bottom: 6px;
    }
.timeline-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 6px;
    }
.timeline-item p {
      font-size: 0.9rem;
      color: var(--text);
      opacity: 0.8;
      line-height: 1.6;
      margin: 0;
    }
.values-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
.value-card {
      background: var(--white);
      border: 2px solid var(--border-dark);
      padding: 24px;
      text-align: center;
      transition: box-shadow 0.3s ease;
    }
.value-card:hover {
      box-shadow: var(--shadow-hard-sm);
    }
.value-card i {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 12px;
    }
.value-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
.value-card p {
      font-size: 0.9rem;
      color: var(--text);
      opacity: 0.8;
      line-height: 1.6;
      margin: 0;
    }
.about-hero h1 {
        font-size: 2rem;
      }
.about-content {
        padding: 24px;
      }
.stats-about {
        grid-template-columns: repeat(2, 1fr);
      }
.about-hero {
        padding: 60px 0 40px;
      }

/* --- 子页面追加 --- */
.disclaimer-block {
            background: var(--white);
            border: 2px solid var(--border-dark);
            border-radius: 12px;
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow-hard-sm);
        }
.disclaimer-block h2 {
            color: var(--primary);
            font-weight: 800;
            font-size: 1.5rem;
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--accent);
        }
.disclaimer-block h3 {
            color: var(--text);
            font-weight: 700;
            font-size: 1.2rem;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
        }
.disclaimer-block p {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 1rem;
        }
.disclaimer-block ul {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
.disclaimer-block li {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 0.5rem;
        }
.disclaimer-block .highlight {
            background: rgba(100, 116, 139, 0.1);
            border-left: 4px solid var(--primary);
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            font-weight: 500;
        }
.disclaimer-block .contact-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-top: 1rem;
        }
.disclaimer-block .contact-links a {
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            border-bottom: 2px solid var(--accent);
            transition: all 0.2s ease;
        }
.disclaimer-block .contact-links a:hover {
            color: var(--text);
            border-bottom-color: var(--primary);
        }
.page-hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            padding: 4rem 0 3rem;
            margin-bottom: 3rem;
            border-bottom: 3px solid var(--border-dark);
            position: relative;
        }
.page-hero h1 {
            color: var(--white);
            font-weight: 900;
            font-size: 2.5rem;
            text-shadow: 2px 2px 0 var(--border-dark);
            margin-bottom: 0.5rem;
        }
.page-hero .subtitle {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1.1rem;
            font-weight: 500;
        }
.navbar-custom .nav-link:hover,
        .navbar-custom .nav-link.active {
            color: var(--primary);
            background: rgba(100, 116, 139, 0.1);
            border-radius: 6px;
        }
footer a {
            color: var(--accent);
            text-decoration: none;
        }
footer a:hover {
            color: var(--white);
        }
.footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 2rem;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }

/* --- 子页面追加 --- */
/* 本页专属样式(仅覆盖少量需要微调的地方) */
        .guide-hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: var(--white);
            padding: 4rem 0 3rem;
            border-bottom: 4px solid var(--border-dark);
            position: relative;
        }
.guide-hero::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            right: 0;
            height: 10px;
            background: repeating-linear-gradient(45deg, var(--border-dark), var(--border-dark) 10px, transparent 10px, transparent 20px);
            opacity: 0.15;
        }
.guide-badge {
            display: inline-block;
            background: var(--border-dark);
            color: var(--white);
            font-family: 'Inter', sans-serif;
            font-weight: 700;
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            border-radius: 2px;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: 1rem;
            box-shadow: var(--shadow-hard-sm);
        }
.step-card {
            background: var(--white);
            border: 2px solid var(--border-dark);
            box-shadow: var(--shadow-hard-sm);
            padding: 1.5rem;
            height: 100%;
            transition: all 0.2s ease;
            position: relative;
        }
.step-card:hover {
            transform: translate(-2px, -2px);
            box-shadow: 8px 8px 0 0 var(--border-dark);
        }
.step-number {
            font-family: 'Inter', sans-serif;
            font-weight: 900;
            font-size: 2.5rem;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 0.75rem;
            display: block;
        }
.tip-box {
            background: var(--bg);
            border-left: 5px solid var(--primary);
            padding: 1.25rem 1.5rem;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
.tip-box i {
            color: var(--primary);
            margin-right: 0.5rem;
        }
.keyboard-shortcut {
            display: inline-block;
            background: var(--border-dark);
            color: var(--white);
            font-family: 'Inter', sans-serif;
            font-size: 0.8rem;
            font-weight: 600;
            padding: 0.15rem 0.5rem;
            border-radius: 3px;
            margin: 0 0.2rem;
            box-shadow: 2px 2px 0 0 var(--accent);
        }
.section-label {
            font-family: 'Inter', sans-serif;
            font-weight: 800;
            font-size: 0.8rem;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
.guide-content h2 {
            font-weight: 800;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.75rem;
            border-bottom: 3px solid var(--border-dark);
            display: inline-block;
        }
.guide-content h2::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 40%;
            height: 3px;
            background: var(--primary);
        }
.btn-guide {
            background: var(--white);
            color: var(--border-dark);
            border: 2px solid var(--white);
            font-weight: 700;
            padding: 0.75rem 2rem;
            font-size: 1rem;
            transition: all 0.2s ease;
            text-decoration: none;
            display: inline-block;
        }
.btn-guide:hover {
            background: transparent;
            color: var(--white);
            box-shadow: 4px 4px 0 0 var(--accent);
        }
.breadcrumb-custom {
            background: transparent;
            padding: 0;
            margin: 0;
        }
.breadcrumb-custom a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
        }
.breadcrumb-custom a:hover {
            text-decoration: underline;
        }
.breadcrumb-custom .separator {
            color: var(--accent);
            margin: 0 0.5rem;
        }
.breadcrumb-custom .current {
            color: var(--text);
            font-weight: 600;
        }
.table-of-contents {
            background: var(--bg);
            border: 2px solid var(--border-dark);
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
.table-of-contents ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
.table-of-contents li {
            padding: 0.35rem 0;
            border-bottom: 1px dashed var(--accent);
        }
.table-of-contents li:last-child {
            border-bottom: none;
        }
.table-of-contents a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
        }
.table-of-contents a:hover {
            color: var(--primary);
            padding-left: 0.25rem;
        }
.table-of-contents i {
            color: var(--primary);
            margin-right: 0.5rem;
            font-size: 0.8rem;
        }

/* --- 子页面追加 --- */
/* 排行页专属样式 */
        .ranking-hero {
            background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
            padding: 80px 0;
            color: #fff;
        }
.ranking-hero h1 {
            font-size: 2.5rem;
            font-weight: 800;
            color: #fff;
        }
.ranking-hero .subtitle {
            color: #94a3b8;
            font-size: 1.1rem;
        }
.rank-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
.rank-tab {
            padding: 8px 20px;
            border: 2px solid #1e293b;
            background: #fff;
            color: #1e293b;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: var(--shadow-hard-sm);
        }
.rank-tab:hover, .rank-tab.active {
            background: #1e293b;
            color: #fff;
        }
.rank-item {
            background: #fff;
            border: 2px solid #1e293b;
            padding: 20px;
            margin-bottom: 16px;
            display: flex;
            gap: 20px;
            align-items: center;
            transition: all 0.2s;
            box-shadow: var(--shadow-hard-sm);
        }
.rank-item:hover {
            transform: translate(-2px, -2px);
            box-shadow: 8px 8px 0 0 #1e293b;
        }
.rank-num {
            font-size: 2rem;
            font-weight: 900;
            color: #1e293b;
            min-width: 60px;
            text-align: center;
        }
.rank-num.top-1 {
            color: #eab308;
            font-size: 2.5rem;
        }
.rank-num.top-2 {
            color: #94a3b8;
            font-size: 2.3rem;
        }
.rank-num.top-3 {
            color: #b45309;
            font-size: 2.1rem;
        }
.rank-cover {
            width: 80px;
            height: 110px;
            object-fit: cover;
            border: 2px solid #1e293b;
            flex-shrink: 0;
        }
.rank-info {
            flex: 1;
        }
.rank-info h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #1e293b;
            margin-bottom: 6px;
        }
.rank-meta {
            display: flex;
            gap: 15px;
            color: #64748b;
            font-size: 0.9rem;
            margin-bottom: 8px;
        }
.rank-meta i {
            margin-right: 4px;
        }
.rank-desc {
            color: #475569;
            font-size: 0.95rem;
            margin: 0;
        }
.rank-tag {
            display: inline-block;
            padding: 2px 10px;
            background: #f1f5f9;
            border: 1px solid #1e293b;
            font-size: 0.8rem;
            font-weight: 600;
            margin-right: 6px;
        }
.rank-stats {
            display: flex;
            gap: 20px;
            margin-top: 10px;
        }
.rank-stats span {
            color: #64748b;
            font-size: 0.85rem;
        }
.rank-stats i {
            margin-right: 4px;
            color: #1e293b;
        }
.ranking-hero h1 {
                font-size: 1.8rem;
            }
.rank-item {
                flex-direction: row;
                padding: 15px;
                gap: 12px;
            }
.rank-num {
                font-size: 1.5rem;
                min-width: 40px;
            }
.rank-cover {
                width: 60px;
                height: 85px;
            }
.rank-meta {
                flex-wrap: wrap;
                gap: 8px;
            }
.ranking-section {
            padding: 60px 0;
        }
.ranking-section:nth-child(even) {
            background: #f8fafc;
        }
.section-header {
            margin-bottom: 40px;
        }
.section-header h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: #1e293b;
            position: relative;
            display: inline-block;
            padding-bottom: 10px;
            margin-bottom: 10px;
        }
.section-header h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: #1e293b;
        }
.section-header p {
            color: #64748b;
            font-size: 1rem;
        }
.update-time {
            background: #fff;
            border: 2px solid #1e293b;
            padding: 8px 16px;
            display: inline-block;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: var(--shadow-hard-sm);
            color: #1e293b;
            margin-bottom: 30px;
        }
.update-time i {
            margin-right: 6px;
        }
.notice-box {
            background: #fff;
            border: 2px solid #1e293b;
            border-left: 6px solid #1e293b;
            padding: 15px 20px;
            margin: 30px 0;
            font-size: 0.95rem;
            color: #475569;
            box-shadow: var(--shadow-hard-sm);
        }
.notice-box i {
            color: #1e293b;
            margin-right: 8px;
        }
.notice-box strong {
            color: #1e293b;
        }

/* --- 子页面追加 --- */
/* 反馈页面专属样式 */
    .feedback-hero {
      background: var(--bg);
      padding: 80px 0 40px;
      text-align: center;
      border-bottom: 3px solid var(--border-dark);
    }
.feedback-hero h1 {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 16px;
    }
.feedback-hero p {
      font-size: 1.1rem;
      color: var(--primary);
      max-width: 700px;
      margin: 0 auto;
    }
.feedback-section {
      background: var(--bg);
      padding: 50px 0;
    }
.feedback-card {
      background: var(--white);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard);
      padding: 32px;
      border-radius: 0;
      margin-bottom: 30px;
    }
.feedback-card h2 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
.feedback-card h2 i {
      color: var(--primary);
    }
.feedback-card p {
      color: var(--text);
      font-size: 1rem;
      line-height: 1.7;
    }
.form-label-custom {
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
      display: block;
    }
.form-control-custom {
      background: var(--white);
      border: 2px solid var(--border-dark);
      border-radius: 0;
      padding: 12px 16px;
      font-size: 1rem;
      color: var(--text);
      width: 100%;
      margin-bottom: 20px;
    }
.form-control-custom:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: var(--shadow-hard-sm);
    }
.form-control-custom::placeholder {
      color: var(--accent);
    }
.btn-feedback {
      background: var(--text);
      color: var(--white);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard-sm);
      padding: 12px 32px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.2s;
    }
.btn-feedback:hover {
      background: var(--primary);
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-hard);
    }
.feedback-tips {
      background: var(--white);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard-sm);
      padding: 20px;
      margin-top: 30px;
    }
.feedback-tips h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }
.feedback-tips ul {
      padding-left: 20px;
      color: var(--text);
    }
.feedback-tips li {
      margin-bottom: 6px;
    }