:root {
    --primary: #0891b2;
    --accent: #0ea5e9;
    --bg: #ecfeff;
    --text: #083344;
    --white: #ffffff;
    --soft-shadow: 0 16px 40px -12px rgba(8, 145, 178, 0.18);
    --radius-lg: 24px;
    --radius-md: 18px;
  }

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

  body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', 'Noto Sans SC', 'Source Han Sans SC', '思源黑体', sans-serif;
    line-height: 1.8;
    overflow-x: hidden;
  }

  h1, h2, h3, h4, h5 {
    font-family: 'Noto Serif SC', 'Source Han Serif SC', '思源宋体', serif;
    font-weight: 700;
  }

  /* 导航 */
  .navbar-custom {
    background: rgba(236, 254, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(8, 145, 178, 0.1);
    padding: 14px 0;
    z-index: 999;
  }

  .navbar-custom .navbar-brand {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 2px;
    font-family: 'Noto Serif SC', serif;
  }

  .navbar-custom .navbar-brand i {
    color: var(--accent);
    margin-right: 4px;
  }

  .navbar-custom .nav-link {
    color: var(--text);
    font-weight: 500;
    margin: 0 6px;
    padding: 8px 12px;
    border-radius: 50px;
    transition: all 0.3s ease;
    font-size: 1rem;
  }

  .navbar-custom .nav-link:hover {
    background: rgba(14, 165, 233, 0.12);
    color: var(--primary);
  }

  .navbar-toggler {
    border: none;
    color: var(--primary);
  }

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

  /* Hero 区域 */
  .hero-section {
    position: relative;
    padding: 160px 0 120px;
    background: linear-gradient(135deg, #ecfeff 0%, #e0f2fe 50%, #bae6fd 100%);
    overflow: hidden;
    margin-bottom: 40px;
  }

  .hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.05"><circle cx="10" cy="10" r="8" fill="%230891b2"/><circle cx="90" cy="80" r="12" fill="%230ea5e9"/><circle cx="50" cy="50" r="4" fill="%230891b2"/></svg>');
    background-size: 200px 200px;
    z-index: 0;
    will-change: transform;
  }

  .hero-section .container {
    position: relative;
    z-index: 2;
  }

  .hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(8, 145, 178, 0.2);
    border-radius: 50px;
    padding: 8px 22px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
  }

  .hero-title {
    font-size: 4rem;
    font-weight: 900;
    color: var(--text);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: 2px;
  }

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

  .hero-subtitle {
    font-size: 1.25rem;
    color: rgba(8, 51, 68, 0.8);
    max-width: 600px;
    margin: 0 auto 40px;
    font-weight: 400;
  }

  .hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
    margin-bottom: 40px;
  }

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

  .hero-stat .number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary);
    font-family: 'Inter', sans-serif;
  }

  .hero-stat .label {
    font-size: 0.95rem;
    color: rgba(8, 51, 68, 0.7);
    margin-top: 4px;
  }

  .hero-cta {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 16px 40px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 12px 28px rgba(8, 145, 178, 0.35);
    transition: all 0.3s ease;
  }

  .hero-cta:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(8, 145, 178, 0.45);
    color: #fff;
  }

  .hero-parallax {
    position: absolute;
    top: -10%;
    right: -5%;
    width: 40%;
    height: 120%;
    background: radial-gradient(circle at center, rgba(14, 165, 233, 0.15) 0%, transparent 60%);
    z-index: 1;
    will-change: transform;
  }

  /* 波浪分割 */
  .wave-divider {
    position: relative;
    width: 100%;
    overflow: hidden;
    line-height: 0;
  }

  .wave-divider svg {
    display: block;
    width: 100%;
    height: 80px;
  }

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

  .section-label {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
  }

  .section-title {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 20px;
    letter-spacing: 1px;
  }

  .section-desc {
    font-size: 1.1rem;
    color: rgba(8, 51, 68, 0.75);
    max-width: 700px;
    margin: 0 auto 50px;
  }

  /* 时间线 */
  .timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
  }

  .timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    transform: translateX(-50%);
  }

  .timeline-item {
    position: relative;
    width: 50%;
    padding: 20px 40px;
    margin-bottom: 20px;
  }

  .timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
  }

  .timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
  }

  .timeline-item .dot {
    position: absolute;
    top: 30px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 4px solid var(--bg);
    box-shadow: 0 0 0 2px var(--accent);
    z-index: 1;
  }

  .timeline-item:nth-child(odd) .dot {
    right: -9px;
  }

  .timeline-item:nth-child(even) .dot {
    left: -9px;
  }

  .timeline-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    box-shadow: var(--soft-shadow);
    transition: all 0.4s ease;
  }

  .timeline-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 24px 48px -12px rgba(8, 145, 178, 0.28);
    border: 1px solid rgba(8, 145, 178, 0.3);
  }

  .timeline-card h4 {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: 8px;
  }

  .timeline-card p {
    font-size: 0.98rem;
    color: rgba(8, 51, 68, 0.8);
    margin: 0;
  }

  /* 对比表格 */
  .compare-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--soft-shadow);
    overflow: hidden;
    margin: 40px 0;
  }

  .compare-table {
    width: 100%;
    border-collapse: collapse;
  }

  .compare-table th, .compare-table td {
    padding: 18px 24px;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
  }

  .compare-table th {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    border: none;
  }

  .compare-table tr:last-child td {
    border-bottom: none;
  }

  .compare-table tr:nth-child(even) {
    background: rgba(236, 254, 255, 0.5);
  }

  .compare-table .fa-check {
    color: #10b981;
    font-size: 1.2rem;
  }

  .compare-table .fa-xmark {
    color: #ef4444;
    font-size: 1.2rem;
  }

  .compare-table .feature-name {
    text-align: left;
    font-weight: 600;
    color: var(--text);
  }

  /* FAQ 手风琴 */
  .faq-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--soft-shadow);
    padding: 60px 40px;
  }

  .accordion-button {
    background: var(--bg);
    color: var(--text);
    font-weight: 600;
    font-size: 1.1rem;
    padding: 20px 24px;
    border-radius: var(--radius-md) !important;
    transition: all 0.3s ease;
  }

  .accordion-button:not(.collapsed) {
    background: rgba(14, 165, 233, 0.1);
    color: var(--primary);
    box-shadow: none;
  }

  .accordion-button:focus {
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.15);
  }

  .accordion-body {
    background: var(--bg);
    color: rgba(8, 51, 68, 0.85);
    padding: 24px;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    font-size: 1rem;
  }

  .accordion-item {
    border: none;
    margin-bottom: 14px;
    background: transparent;
  }

  /* 特色标签页 */
  .features-tabs {
    margin-top: 20px;
  }

  .nav-pills .nav-link {
    background: var(--bg);
    color: var(--text);
    font-weight: 600;
    border-radius: 50px;
    padding: 10px 28px;
    margin: 0 6px;
    border: 1px solid rgba(8, 145, 178, 0.15);
    transition: all 0.3s ease;
  }

  .nav-pills .nav-link.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 8px 20px rgba(8, 145, 178, 0.3);
  }

  .tab-pane {
    padding: 40px 20px;
    animation: fadeIn 0.6s ease;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .feature-icon {
    font-size: 2.8rem;
    color: var(--primary);
    margin-bottom: 20px;
  }

  .feature-text {
    font-size: 1.05rem;
    color: rgba(8, 51, 68, 0.8);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.9;
  }

  /* CTA 区域 */
  .cta-section {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-lg);
    padding: 70px 40px;
    text-align: center;
    color: #fff;
    margin: 60px 0;
    position: relative;
    overflow: hidden;
  }

  .cta-section h2 {
    font-size: 2.6rem;
    font-weight: 800;
    margin-bottom: 20px;
  }

  .cta-section p {
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto 30px;
    opacity: 0.9;
  }

  .cta-button {
    display: inline-block;
    background: #fff;
    color: var(--primary);
    padding: 16px 44px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
  }

  .cta-button:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.2);
    color: var(--primary);
  }

  /* 友情链接 */
  .friend-links {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    margin: 60px 0 40px;
    text-align: center;
  }

  .friend-links h4 {
    font-size: 1.3rem;
    color: var(--primary);
    margin-bottom: 16px;
  }

  .friend-links .links {
    color: var(--text);
    font-size: 0.95rem;
    line-height: 2;
  }

  /* 页脚 */
  footer {
    background: var(--text);
    color: rgba(236, 254, 255, 0.9);
    padding: 50px 0 30px;
    border-radius: 24px 24px 0 0;
    margin-top: 60px;
  }

  footer a {
    color: rgba(236, 254, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
  }

  footer a:hover {
    color: var(--accent);
  }

  .footer-brand {
    font-size: 1.6rem;
    font-weight: 800;
    color: #fff;
    font-family: 'Noto Serif SC', serif;
  }

  /* 滚动动效 */
  .reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.2, 0.8, 0.3, 1);
  }

  .reveal.active {
    opacity: 1;
    transform: translateY(0);
  }

  /* 响应式 */
  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }

    .section-title {
      font-size: 2rem;
    }

    .timeline::before {
      left: 20px;
    }

    .timeline-item, .timeline-item:nth-child(odd), .timeline-item:nth-child(even) {
      width: 100%;
      left: 0;
      padding-left: 60px;
      padding-right: 20px;
      text-align: left !important;
    }

    .timeline-item .dot, .timeline-item:nth-child(odd) .dot, .timeline-item:nth-child(even) .dot {
      left: 12px;
      right: auto;
    }

    .hero-stats {
      gap: 30px;
    }

    .hero-stat .number {
      font-size: 2.2rem;
    }
  }

/* --- 子页面追加 --- */
/* 保证任何Bootstrap组件都被覆盖，但本页尽量不依赖组件类 */
    .about-hero {
      background: linear-gradient(135deg, rgba(8,145,178,.08) 0%, rgba(14,165,233,.05) 100%);
      border-radius: var(--radius-lg);
      padding: 2.5rem 2rem;
      margin-bottom: 2rem;
    }
.about-masonry-card {
      background: rgba(255,255,255,.7);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(8,145,178,.15);
      border-radius: var(--radius-md);
      padding: 1.75rem 1.5rem;
      transition: transform .2s ease, box-shadow .2s ease;
      height: 100%;
      box-shadow: 0 8px 20px -8px rgba(8,145,178,.12);
    }
.about-masonry-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--soft-shadow);
      border-color: rgba(14,165,233,.3);
    }
.about-masonry-card i {
      color: var(--primary);
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
.about-masonry-card h3 {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: .75rem;
      letter-spacing: -.01em;
    }
.about-masonry-card p {
      color: rgba(8,51,68,.75);
      font-size: .95rem;
      line-height: 1.7;
    }
.about-quote {
      background: rgba(14,165,233,.06);
      border-left: 4px solid var(--accent);
      padding: 1.2rem 1.8rem;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      margin: 2.2rem 0;
      font-style: italic;
      color: var(--text);
    }
.about-timeline-extra {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-top: 1.5rem;
    }
.about-timeline-extra span {
      background: rgba(8,145,178,.08);
      padding: .4rem 1.2rem;
      border-radius: 40px;
      font-size: .85rem;
      font-weight: 600;
      color: var(--primary);
    }
/* 保证即使出现Bootstrap表单等也强制覆盖 */
    .form-control, .form-select, .form-label, .input-group-text, .accordion-item, .accordion-button, .accordion-body, .modal-content, .list-group-item {
      background: var(--white) !important;
      color: var(--text) !important;
      border-color: rgba(8,145,178,.25) !important;
    }

/* --- 子页面追加 --- */
.disclaimer-hero {
            background: linear-gradient(135deg, var(--bg) 0%, #dff5ff 100%);
            border-bottom: 1px solid rgba(8,145,178,0.15);
        }
.legal-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 2rem 2.2rem;
            box-shadow: var(--soft-shadow);
            border-left: 4px solid var(--primary);
            margin-bottom: 2rem;
            transition: transform 0.2s ease;
        }
.legal-card:hover {
            transform: translateY(-3px);
        }
.legal-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
.legal-card h2 i {
            color: var(--accent);
            font-size: 1.4rem;
        }
.legal-card p, .legal-card li {
            color: var(--text);
            font-size: 0.98rem;
            line-height: 1.8;
        }
.legal-card ul {
            padding-left: 1.2rem;
            margin-bottom: 0.8rem;
        }
.legal-card ul li {
            margin-bottom: 0.5rem;
        }
.legal-highlight {
            background: rgba(14,165,233,0.08);
            padding: 0.8rem 1.2rem;
            border-radius: 12px;
            border: 1px dashed var(--accent);
            font-weight: 500;
        }
.back-home-link {
            display: inline-block;
            margin-top: 1rem;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
        }
.back-home-link:hover {
            text-decoration: underline;
        }
/* 导航高亮当前页 */
        .navbar-nav .nav-link.active {
            color: var(--primary) !important;
            font-weight: 700;
        }
.footer-links a {
            color: var(--text);
            text-decoration: none;
            margin: 0 0.8rem;
            opacity: 0.8;
        }
.footer-links a:hover {
            opacity: 1;
        }

/* --- 子页面追加 --- */
.guide-hero { background: linear-gradient(135deg, var(--bg) 0%, #d5f5ff 100%); padding: 120px 0 80px; position: relative; overflow: hidden; }
.guide-hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 500px; height: 500px; border-radius: 50%; background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, transparent 70%); }
.guide-card { background: var(--white); border-radius: var(--radius-lg); padding: 2.5rem; box-shadow: var(--soft-shadow); height: 100%; transition: transform 0.3s ease; }
.guide-card:hover { transform: translateY(-6px); }
.guide-icon { width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 1.2rem; }
.icon-cyan { background: rgba(8, 145, 178, 0.12); color: var(--primary); }
.icon-sky { background: rgba(14, 165, 233, 0.12); color: var(--accent); }
.icon-deep { background: rgba(8, 51, 68, 0.08); color: var(--text); }
.step-number { width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; flex-shrink: 0; }
.tip-box { background: rgba(8, 145, 178, 0.06); border-left: 4px solid var(--primary); border-radius: 0 12px 12px 0; padding: 1.2rem 1.5rem; margin: 1.5rem 0; }
.table-custom { width: 100%; border-collapse: separate; border-spacing: 0; border-radius: 14px; overflow: hidden; box-shadow: var(--soft-shadow); }
.table-custom thead th { background: var(--primary); color: #fff; padding: 1rem 1.2rem; font-weight: 600; border: none; }
.table-custom tbody td { padding: 1rem 1.2rem; background: var(--white); border-bottom: 1px solid rgba(8, 145, 178, 0.08); }
.table-custom tbody tr:last-child td { border-bottom: none; }
.table-custom tbody tr:hover td { background: rgba(8, 145, 178, 0.04); }
.resource-list { list-style: none; padding: 0; margin: 0; }
.resource-list li { padding: 0.8rem 0; border-bottom: 1px dashed rgba(8, 145, 178, 0.15); display: flex; align-items: center; gap: 0.8rem; }
.resource-list li:last-child { border-bottom: none; }
.resource-list li i { color: var(--primary); width: 20px; text-align: center; }
.accordion-custom .accordion-item { background: var(--white); border: 1px solid rgba(8, 145, 178, 0.1); border-radius: 14px !important; margin-bottom: 1rem; overflow: hidden; }
.accordion-custom .accordion-button { background: var(--white); color: var(--text); padding: 1.2rem 1.5rem; font-weight: 600; box-shadow: none; }
.accordion-custom .accordion-button:not(.collapsed) { background: rgba(8, 145, 178, 0.04); color: var(--primary); }
.accordion-custom .accordion-button:focus { box-shadow: none; }
.accordion-custom .accordion-body { background: var(--white); color: var(--text); padding: 0 1.5rem 1.5rem; line-height: 1.8; }
.guide-sidebar { position: sticky; top: 100px; }
.guide-sidebar .card { background: var(--white); border-radius: var(--radius-lg); padding: 1.5rem; box-shadow: var(--soft-shadow); border: none; }
.guide-sidebar .card-title { color: var(--text); font-weight: 700; margin-bottom: 1rem; }
.guide-sidebar .list-group-item { background: transparent; border: none; padding: 0.6rem 0; color: var(--text); display: flex; align-items: center; gap: 0.5rem; }
.guide-sidebar .list-group-item i { color: var(--primary); font-size: 0.8rem; }
.guide-sidebar .list-group-item:hover { color: var(--primary); }
.guide-sidebar .list-group-item a { color: inherit; text-decoration: none; }
.guide-hero { padding: 100px 0 60px; }
.guide-sidebar { position: static; margin-bottom: 2rem; }
.guide-card { padding: 1.5rem; }
.guide-hero { padding: 90px 0 50px; }

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