:root {
  --primary: #64748b;
  --accent: #94a3b8;
  --bg: #f1f5f9;
  --text: #1e293b;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
/* 几何色块背景装饰 */
.bg-decor {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.bg-decor .shape {
  position: absolute;
  opacity: 0.12;
  animation: floatShape 12s ease-in-out infinite;
}
.bg-decor .circle { border-radius: 50%; background: var(--primary); }
.bg-decor .square { background: var(--accent); }
.bg-decor .triangle {
  width: 0; height: 0;
  border-left: 40px solid transparent;
  border-right: 40px solid transparent;
  border-bottom: 70px solid var(--primary);
}
.bg-decor .s1 { width: 180px; height: 180px; top: 10%; left: 5%; animation-delay: 0s; }
.bg-decor .s2 { width: 90px; height: 90px; top: 70%; left: 85%; animation-delay: 2s; }
.bg-decor .s3 { width: 140px; height: 140px; top: 40%; left: 90%; animation-delay: 4s; }
.bg-decor .s4 { width: 60px; height: 60px; top: 80%; left: 8%; animation-delay: 6s; }
.bg-decor .s5 { width: 110px; height: 110px; top: 15%; left: 70%; animation-delay: 3s; }
@keyframes floatShape {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(10deg); }
}
.main-content { position: relative; z-index: 1; }

/* 导航 */
.navbar-custom {
  background: rgba(241, 245, 249, 0.7);
  backdrop-filter: blur(10px);
  transition: background 0.4s, box-shadow 0.4s;
  padding: 12px 0;
}
.navbar-custom.scrolled {
  background: rgba(241, 245, 249, 0.95);
  box-shadow: 0 4px 20px rgba(30, 41, 59, 0.1);
  position: sticky;
  top: 0;
  z-index: 999;
}
.navbar-brand {
  font-weight: 900;
  font-size: 1.8rem;
  color: var(--text);
  letter-spacing: -0.5px;
  display: inline-flex;
  align-items: center;
}
.navbar-brand i {
  color: var(--primary);
  font-size: 1.4rem;
  margin-right: 8px;
}
.nav-link {
  font-weight: 600;
  color: var(--text);
  margin: 0 10px;
  font-size: 0.95rem;
  transition: color 0.3s;
}
.nav-link:hover { color: var(--primary); }
.navbar-toggler {
  border: 2px solid var(--primary);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 1.2rem;
  color: var(--primary);
  background: transparent;
}

/* Hero */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  min-height: 70vh;
  display: flex;
  align-items: center;
  position: relative;
}
.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--text) 30%, var(--primary) 70%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  letter-spacing: -2px;
}
.hero-sub {
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 30px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--text);
  color: var(--bg);
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  box-shadow: 0 8px 30px rgba(30, 41, 59, 0.3);
  transition: all 0.3s;
}
.hero-cta:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(100, 116, 139, 0.4);
}

/* 区块通用 */
.section-block {
  padding: 70px 0;
  position: relative;
}
.section-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 40px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60%;
  height: 4px;
  background: var(--primary);
  border-radius: 4px;
}
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* 特色标签页 */
.feature-tabs {
  background: #fff;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 10px 40px rgba(30, 41, 59, 0.08);
}
.nav-pills .nav-link {
  background: transparent;
  color: var(--text);
  font-weight: 600;
  border-radius: 12px;
  padding: 10px 20px;
  margin: 5px;
}
.nav-pills .nav-link.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(100, 116, 139, 0.4);
}
.tab-content {
  padding-top: 25px;
}
.feature-card {
  background: var(--bg);
  border-radius: 16px;
  padding: 25px;
  margin-bottom: 15px;
  border-left: 5px solid var(--primary);
  transition: transform 0.3s;
}
.feature-card:hover { transform: translateX(8px); }
.feature-card i {
  color: var(--primary);
  font-size: 1.6rem;
  margin-bottom: 12px;
}
.feature-card h5 {
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.feature-card p {
  color: #475569;
  font-size: 0.9rem;
  margin: 0;
}

/* FAQ折叠 */
.accordion-item {
  border: none;
  margin-bottom: 15px;
  border-radius: 14px !important;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(30, 41, 59, 0.06);
}
.accordion-button {
  background: #fff;
  color: var(--text);
  font-weight: 700;
  font-size: 1rem;
  padding: 18px 25px;
}
.accordion-button:not(.collapsed) {
  background: var(--primary);
  color: #fff;
  box-shadow: none;
}
.accordion-button:focus { box-shadow: none; border: none; }
.accordion-body {
  background: #fff;
  color: #475569;
  padding: 20px 25px;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* 介绍时间线 */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  border-radius: 3px;
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding: 20px 25px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 5px 20px rgba(30, 41, 59, 0.06);
  transition: transform 0.3s, box-shadow 0.3s;
}
.timeline-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 35px rgba(30, 41, 59, 0.1);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 25px;
  width: 14px;
  height: 14px;
  background: var(--primary);
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: 0 0 0 3px var(--primary);
}
.timeline-date {
  font-family: 'Courier New', monospace;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.85rem;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.timeline-item h4 {
  font-weight: 800;
  font-size: 1.3rem;
  margin-bottom: 10px;
}
.timeline-item p {
  color: #475569;
  font-size: 0.92rem;
  margin: 0;
}

/* CTA */
.cta-section {
  background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
  padding: 80px 0;
  text-align: center;
  border-radius: 30px;
  margin: 40px 0;
  position: relative;
  overflow: hidden;
}
.cta-section h2 {
  color: #fff;
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 20px;
}
.cta-section p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  margin-bottom: 30px;
}
.cta-btn {
  background: #fff;
  color: var(--text);
  padding: 14px 40px;
  border-radius: 50px;
  font-weight: 800;
  text-decoration: none;
  font-size: 1.1rem;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
  transition: all 0.3s;
}
.cta-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.05);
}

/* 友情链接 */
.friend-links {
  background: #fff;
  padding: 40px 0;
  border-top: 1px solid #e2e8f0;
}
.friend-links .title {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 15px;
}
.friend-links a {
  color: var(--text);
  text-decoration: none;
  margin: 0 15px;
  font-size: 0.9rem;
  transition: color 0.3s;
}
.friend-links a:hover { color: var(--primary); }

/* 页脚 */
footer {
  background: var(--text);
  color: var(--bg);
  padding: 30px 0;
  text-align: center;
}
footer .brand-footer {
  font-size: 1.6rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 10px;
}
footer .copyright {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
}

/* hover效果 - 图片卡片 */
.hover-card {
  overflow: hidden;
  border-radius: 14px;
  position: relative;
  cursor: pointer;
  margin-bottom: 20px;
}
.hover-card img {
  transition: transform 0.6s ease;
  width: 100%;
  height: 280px;
  object-fit: cover;
}
.hover-card:hover img {
  transform: scale(1.1);
}
.hover-card .overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(30, 41, 59, 0.9), transparent);
  color: #fff;
  padding: 30px 20px 15px;
  opacity: 0;
  transition: opacity 0.4s;
}
.hover-card:hover .overlay { opacity: 1; }
.hover-card .overlay h6 { font-weight: 700; margin-bottom: 5px; }
.hover-card .overlay p { font-size: 0.85rem; margin: 0; opacity: 0.9; }

/* 数据字体 */
.stat-num {
  font-family: 'Courier New', monospace;
  font-weight: 700;
  color: var(--primary);
  font-size: 1.4rem;
}

/* 滚动动效 */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
  .hero-title { font-size: 2.5rem; }
  .section-title { font-size: 1.6rem; }
  .cta-section h2 { font-size: 1.8rem; }
  .timeline { padding-left: 30px; }
  .timeline-item::before { left: -25px; }
}

/* --- 子页面追加 --- */
/* 本页专属样式 —— 关于页特殊排版 */
    .about-hero {
      background: linear-gradient(135deg, #64748b 0%, #94a3b8 100%);
      color: #ffffff;
      padding: 100px 0 80px;
      position: relative;
      overflow: hidden;
    }
.about-hero .bg-decor {
      position: absolute;
      width: 300px;
      height: 300px;
      border-radius: 50%;
      background: rgba(255,255,255,0.08);
      top: -80px;
      right: -60px;
    }
.about-hero .bg-decor:nth-child(2) {
      width: 180px;
      height: 180px;
      bottom: -50px;
      left: 10%;
      top: auto;
      right: auto;
    }
.about-hero h1 {
      font-size: 3rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      position: relative;
      z-index: 2;
    }
.about-hero p {
      font-size: 1.2rem;
      opacity: 0.95;
      max-width: 600px;
      margin-top: 16px;
      position: relative;
      z-index: 2;
    }
.about-section {
      padding: 80px 0;
    }
.about-section:nth-of-type(even) {
      background: #ffffff;
    }
.about-section .section-block {
      padding: 0;
    }
.about-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 48px;
    }
.about-grid-item {
      background: var(--bg);
      border-radius: 16px;
      padding: 32px 24px;
      border-left: 4px solid var(--primary);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
.about-grid-item:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 30px rgba(100, 116, 139, 0.15);
    }
.about-grid-item i {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
.about-grid-item h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }
.about-grid-item p {
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
    }
.about-cta {
      background: var(--primary);
      color: #ffffff;
      padding: 60px 0;
      text-align: center;
    }
.about-cta h2 {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
.about-cta p {
      font-size: 1.1rem;
      opacity: 0.9;
      max-width: 600px;
      margin: 0 auto 32px;
    }
.about-cta .cta-btn {
      display: inline-block;
      background: #ffffff;
      color: var(--primary);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      font-size: 1rem;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
.about-cta .cta-btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    }
.about-grid {
        grid-template-columns: 1fr;
      }
.about-hero h1 {
        font-size: 2.2rem;
      }
.about-section {
        padding: 60px 0;
      }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .disclaimer-hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
        }
.disclaimer-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            animation: float 8s ease-in-out infinite;
        }
.disclaimer-hero h1 {
            color: #fff;
            font-weight: 800;
            font-size: 2.8rem;
            position: relative;
            z-index: 1;
        }
.disclaimer-hero p {
            color: rgba(255,255,255,0.9);
            font-size: 1.1rem;
            position: relative;
            z-index: 1;
        }
.disclaimer-section {
            background: var(--bg);
            padding: 60px 0;
        }
.disclaimer-card {
            background: #fff;
            border-radius: 16px;
            padding: 40px;
            margin-bottom: 30px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
            border-left: 4px solid var(--primary);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
.disclaimer-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(100,116,139,0.15);
        }
.disclaimer-card h2 {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.5rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
.disclaimer-card h2 i {
            font-size: 1.3rem;
            color: var(--accent);
        }
.disclaimer-card p {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
        }
.disclaimer-card ul {
            color: var(--text);
            line-height: 2;
            padding-left: 20px;
        }
.disclaimer-card ul li {
            margin-bottom: 8px;
            position: relative;
        }
.disclaimer-card ul li::marker {
            color: var(--primary);
        }
.highlight-box {
            background: rgba(100,116,139,0.08);
            border-radius: 10px;
            padding: 20px 24px;
            margin: 20px 0;
            border: 1px solid rgba(100,116,139,0.15);
        }
.highlight-box p {
            margin-bottom: 0;
            font-weight: 500;
        }
.update-info {
            background: var(--primary);
            color: #fff;
            border-radius: 8px;
            padding: 12px 24px;
            display: inline-block;
            font-size: 0.9rem;
            margin-top: 10px;
        }
.contact-email {
            color: var(--primary);
            font-weight: 600;
            text-decoration: underline;
            text-decoration-color: var(--accent);
            text-underline-offset: 4px;
        }
.disclaimer-hero h1 {
                font-size: 2rem;
            }
.disclaimer-card {
                padding: 24px;
            }

/* --- 子页面追加 --- */
.privacy-section { padding: 60px 0; }
.privacy-card { background: rgba(255,255,255,0.7); border: 1px solid var(--accent); border-radius: 16px; padding: 30px; margin-bottom: 25px; transition: all 0.3s ease; }
.privacy-card:hover { background: rgba(255,255,255,0.9); box-shadow: 0 8px 25px rgba(0,0,0,0.08); }
.privacy-card h3 { color: var(--primary); font-weight: 700; margin-bottom: 15px; font-size: 1.3rem; }
.privacy-card p { color: var(--text); line-height: 1.8; margin-bottom: 12px; }
.privacy-card ul { padding-left: 20px; margin-bottom: 15px; }
.privacy-card li { color: var(--text); line-height: 1.8; margin-bottom: 8px; }
.privacy-card strong { color: var(--primary); }
.privacy-badge { display: inline-block; background: var(--primary); color: #fff; padding: 5px 15px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; margin-bottom: 20px; }
.last-updated { font-size: 0.9rem; color: var(--accent); margin-bottom: 30px; }
.privacy-hero { background: linear-gradient(135deg, var(--bg) 0%, #e2e8f0 100%); padding: 50px 0 40px; text-align: center; }
.privacy-hero h1 { color: var(--primary); font-weight: 800; font-size: 2.5rem; margin-bottom: 15px; }
.privacy-hero p { color: var(--text); max-width: 700px; margin: 0 auto; font-size: 1.1rem; line-height: 1.8; }
.privacy-hero h1 { font-size: 1.8rem; }
.privacy-card { padding: 20px; }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-header { background:transparent !important; }