:root {
    --primary: #0891b2;
    --accent: #0ea5e9;
    --bg: #ecfeff;
    --text: #083344;
    --border: #083344;
    --shadow: 6px 6px 0px 0px rgba(8, 51, 68, 1);
    --radius: 0px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    border-radius: var(--radius) !important;
  }

  body {
    font-family: var(--font-main);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* 全直角硬朗风格 */
  .navbar, .btn, .card, .list-group-item, .accordion-item, .accordion-button, .faq-card, .hero-section, .section-title {
    border-radius: 0 !important;
  }

  /* 粗边框 + 硬阴影 */
  .hard-border {
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
  }

  /* 顶部导航 */
  .navbar {
    background-color: var(--bg);
    border-bottom: 3px solid var(--border);
    padding: 12px 0;
  }

  .navbar-brand {
    font-weight: 900;
    font-size: 1.8rem;
    color: var(--text) !important;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
  }

  .navbar-brand i {
    color: var(--primary);
    margin-right: 8px;
    font-size: 1.8rem;
  }

  .nav-link {
    font-weight: 600;
    color: var(--text) !important;
    margin: 0 8px;
    position: relative;
    padding: 4px 0;
    text-transform: uppercase;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--primary);
    transition: width 0.3s ease;
  }

  .nav-link:hover::after {
    width: 100%;
  }

  .navbar-toggler {
    border: 2px solid var(--border);
    border-radius: 0 !important;
  }

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

  /* Hero 区 */
  .hero-section {
    padding: 80px 0 100px;
    border-bottom: 3px solid var(--border);
    background: var(--bg);
  }

  .hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 24px;
    color: var(--text);
  }

  .hero-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    max-width: 600px;
    color: var(--text);
    opacity: 0.85;
    margin-bottom: 32px;
  }

  .hero-btn {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    padding: 16px 40px;
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
  }

  .hero-btn:hover {
    background-color: var(--accent);
    transform: translate(2px, 2px);
    box-shadow: 3px 3px 0px 0px rgba(8, 51, 68, 1);
    color: white;
  }

  /* 光泽扫过效果 */
  .hero-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s ease;
  }

  .hero-btn:hover::after {
    left: 100%;
  }

  /* 打字机光标 */
  .typed-cursor {
    display: inline-block;
    width: 4px;
    height: 1em;
    background-color: var(--primary);
    margin-left: 4px;
    animation: blink 0.7s step-end infinite;
    vertical-align: -0.1em;
  }

  @keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
  }

  /* 区块标题 */
  .section-label {
    display: inline-block;
    background-color: var(--text);
    color: var(--bg);
    font-weight: 800;
    font-size: 0.85rem;
    padding: 6px 16px;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
  }

  .section-title {
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 20px;
  }

  .section-sub {
    font-size: 1.1rem;
    max-width: 700px;
    opacity: 0.8;
    margin-bottom: 40px;
  }

  /* 对比表格 */
  .compare-section {
    padding: 80px 0;
    border-bottom: 3px solid var(--border);
  }

  .compare-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
  }

  .compare-table th, .compare-table td {
    padding: 18px 20px;
    border: 2px solid var(--border);
    text-align: center;
    font-weight: 500;
  }

  .compare-table thead th {
    background-color: var(--text);
    color: var(--bg);
    font-weight: 800;
    font-size: 1.1rem;
    text-transform: uppercase;
  }

  .compare-table tbody tr:nth-child(even) {
    background-color: #f0fdfa;
  }

  .compare-table .highlight-col {
    background-color: var(--primary) !important;
    color: white;
    font-weight: 700;
  }

  .compare-table .fa-check {
    color: #16a34a;
    font-size: 1.2rem;
  }

  .compare-table .fa-xmark {
    color: #dc2626;
    font-size: 1.2rem;
  }

  /* 特色图标列表 */
  .feature-card {
    background: white;
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
    padding: 32px 24px;
    height: 100%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }

  .feature-card:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0px 0px rgba(8, 51, 68, 1);
  }

  .feature-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 16px;
  }

  .feature-title {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 12px;
  }

  .feature-desc {
    opacity: 0.8;
    font-size: 0.95rem;
  }

  /* 介绍区 */
  .about-section {
    padding: 80px 0;
    border-bottom: 3px solid var(--border);
  }

  .about-text p {
    font-size: 1.05rem;
    margin-bottom: 20px;
    opacity: 0.9;
    max-width: 800px;
  }

  /* FAQ 手风琴 */
  .faq-section {
    padding: 80px 0;
    border-bottom: 3px solid var(--border);
  }

  .accordion-item {
    background: white;
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
  }

  .accordion-button {
    background-color: white;
    color: var(--text);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 20px 24px;
    border: none;
  }

  .accordion-button:not(.collapsed) {
    background-color: var(--primary);
    color: white;
    box-shadow: none;
  }

  .accordion-button:focus {
    box-shadow: none;
  }

  .accordion-body {
    padding: 20px 24px;
    font-size: 1rem;
    opacity: 0.85;
    border-top: 2px solid var(--border);
  }

  /* CTA 区 */
  .cta-section {
    padding: 100px 0;
    background-color: var(--text);
    color: var(--bg);
  }

  .cta-section .section-title {
    color: var(--bg);
  }

  .cta-btn {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    font-weight: 800;
    font-size: 1.3rem;
    padding: 18px 50px;
    border: 3px solid var(--bg);
    box-shadow: 6px 6px 0px 0px var(--accent);
    text-decoration: none;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
  }

  .cta-btn:hover {
    transform: translate(2px, 2px);
    box-shadow: 3px 3px 0px 0px var(--accent);
    color: white;
  }

  .cta-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
  }

  .cta-btn:hover::after {
    left: 100%;
  }

  /* 友情链接 */
  .friend-links {
    padding: 40px 0;
    border-top: 3px solid var(--border);
  }

  .friend-links h3 {
    font-size: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
  }

  .friend-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    margin-right: 24px;
    opacity: 0.8;
    transition: opacity 0.2s;
  }

  .friend-links a:hover {
    opacity: 1;
    color: var(--primary);
  }

  /* 页脚 */
  footer {
    background-color: var(--text);
    color: var(--bg);
    padding: 40px 0 60px;
    border-top: 3px solid var(--border);
  }

  footer a {
    color: var(--bg);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s;
  }

  footer a:hover {
    opacity: 1;
    color: var(--accent);
  }

  /* 回到顶部按钮 */
  #backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    color: white;
    border: 3px solid var(--border);
    box-shadow: var(--shadow);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  #backToTop.visible {
    opacity: 1;
    visibility: visible;
  }

  #backToTop:hover {
    background-color: var(--accent);
  }

  /* 滚动渐显动画 */
  .scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
  }

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

  .delay-1 { transition-delay: 0.1s; }
  .delay-2 { transition-delay: 0.2s; }
  .delay-3 { transition-delay: 0.3s; }
  .delay-4 { transition-delay: 0.4s; }
  .delay-5 { transition-delay: 0.5s; }

  /* 响应式 */
  @media (max-width: 992px) {
    .hero-title { font-size: 3rem; }
    .section-title { font-size: 2.2rem; }
  }

  @media (max-width: 768px) {
    .hero-title { font-size: 2.2rem; }
    .hero-section { padding: 50px 0 70px; }
    .navbar-brand { font-size: 1.4rem; }
    .compare-table { font-size: 0.8rem; }
    .compare-table th, .compare-table td { padding: 10px 8px; }
  }

/* --- 子页面追加 --- */
.about-page-hero {
      padding: 80px 0 40px;
      background: var(--bg);
    }
.about-page-hero .page-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 12px;
    }
.about-page-hero .page-subtitle {
      font-size: 1.15rem;
      color: var(--text);
      opacity: 0.8;
      max-width: 700px;
      margin: 0 auto;
    }
.about-section-content {
      background: var(--bg);
      padding: 60px 0;
    }
.about-section-content .inner-card {
      background: #fff;
      border: 2px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 40px;
      margin-bottom: 40px;
    }
.about-section-content .inner-card h2 {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
    }
.about-section-content .inner-card p {
      color: var(--text);
      opacity: 0.9;
      line-height: 1.8;
      margin-bottom: 16px;
    }
.about-section-content .inner-card ul {
      padding-left: 20px;
      color: var(--text);
      opacity: 0.9;
      line-height: 1.8;
      margin-bottom: 16px;
    }
.about-section-content .inner-card li {
      margin-bottom: 8px;
    }
.about-section-content .icon-box {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
.value-card {
      background: #fff;
      border: 2px solid var(--border);
      border-radius: var(--radius);
      padding: 28px 24px;
      margin-bottom: 20px;
      height: 100%;
      transition: all 0.3s ease;
    }
.value-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow);
    }
.value-card .value-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
.value-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }
.value-card p {
      color: var(--text);
      opacity: 0.85;
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 0;
    }
.timeline-item {
      position: relative;
      padding-left: 28px;
      margin-bottom: 24px;
      border-left: 2px solid var(--primary);
    }
.timeline-item::before {
      content: '';
      position: absolute;
      left: -7px;
      top: 4px;
      width: 12px;
      height: 12px;
      background: var(--primary);
      border-radius: 50%;
      border: 2px solid var(--bg);
    }
.timeline-item .year {
      font-weight: 700;
      color: var(--primary);
      font-size: 1.1rem;
      margin-bottom: 6px;
    }
.timeline-item .desc {
      color: var(--text);
      opacity: 0.85;
      line-height: 1.6;
    }
.about-page-hero .page-title { font-size: 1.8rem; }
.about-section-content .inner-card { padding: 24px; }

/* --- 子页面追加 --- */
.privacy-section {
            background: var(--bg);
            padding: 60px 0;
        }
.privacy-content {
            background: rgba(255,255,255,0.6);
            border: 2px solid var(--border);
            padding: 40px;
            box-shadow: var(--shadow);
        }
.privacy-content h2 {
            color: var(--primary);
            font-weight: 700;
            margin-top: 30px;
            margin-bottom: 20px;
            font-size: 1.5rem;
        }
.privacy-content h2:first-child {
            margin-top: 0;
        }
.privacy-content p {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 15px;
            font-size: 1rem;
        }
.privacy-content ul {
            color: var(--text);
            padding-left: 20px;
            margin-bottom: 15px;
        }
.privacy-content li {
            line-height: 1.8;
            margin-bottom: 8px;
        }
.privacy-content strong {
            color: var(--primary);
        }
.privacy-content .highlight {
            background: var(--bg);
            padding: 15px;
            border-left: 4px solid var(--primary);
            margin: 20px 0;
        }
.privacy-content .last-update {
            color: var(--primary);
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 30px;
            display: block;
        }

/* --- 子页面追加 --- */
/* 确保所有组件背景、文字颜色跟随主题 */
    .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: transparent;
      background-color: transparent;
      color: var(--text);
      border-color: var(--border);
    }
/* 更精细覆盖：卡片类，输入框，手风琴 */
    .card, .card-body { background: var(--bg); color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow); }
.accordion-button, .accordion-item { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.form-control, .form-select { background: rgba(8, 51, 68, 0.05); color: var(--text); border: 1px solid var(--border); }
.form-control::placeholder { color: rgba(8, 51, 68, 0.5); }
/* 列表组 */
    .list-group-item { background: var(--bg); color: var(--text); border-color: var(--border); }
/* 表格 */
    .table { --bs-table-bg: var(--bg); color: var(--text); border-color: var(--border); }
.table th, .table td { border-color: var(--border); }
/* 导航栏本身可能透明，但确保链接颜色 */
    .navbar { background: var(--bg) !important; border-bottom: 1px solid var(--border); }
.navbar-brand, .nav-link { color: var(--text) !important; }
.nav-link.active { color: var(--primary) !important; font-weight: 700; }
.navbar-toggler i { color: var(--text); }
/* 本页特色：免责声明专用小图标列表 */
    .terms-icon-list li { margin-bottom: 0.5rem; display: flex; gap: 0.75rem; align-items: baseline; }
.terms-icon-list i { color: var(--primary); width: 1.25rem; text-align: center; flex-shrink: 0; }
/* 加粗提示块 */
    .terms-notice { background: rgba(8, 145, 178, 0.05); border-left: 4px solid var(--primary); padding: 1rem 1.25rem; margin: 1.5rem 0; }

/* --- 子页面追加 --- */
/* 本页专属小范围样式 */
        .guide-hero { padding: 60px 0 20px; }
.guide-section { padding: 50px 0; }
.guide-section:nth-child(even) { background: rgba(8, 51, 68, 0.03); }
.step-list { list-style: none; padding: 0; margin: 0; }
.step-list li { padding: 10px 0; display: flex; align-items: flex-start; gap: 15px; }
.step-num { font-size: 1.2rem; font-weight: 800; color: var(--primary); min-width: 40px; }
.tip-box { border: 2px solid var(--border); box-shadow: var(--shadow); padding: 20px; margin-top: 20px; }
.shortcut-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; margin-top: 20px; }
.shortcut-item { border: 1px solid var(--border); padding: 15px; }
.shortcut-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 5px; }
.shortcut-item p { font-size: 0.9rem; margin: 0; opacity: 0.8; }

/* --- 子页面追加 --- */
/* 排行榜专属样式 */
        .rank-section { padding: 80px 0; }
.rank-hero { padding: 120px 0 60px; }
.rank-card {
            background: var(--bg);
            border: 2px solid var(--border);
            box-shadow: var(--shadow);
            margin-bottom: 30px;
            padding: 25px;
            transition: transform 0.3s ease;
        }
.rank-card:hover { transform: translate(-3px, -3px); }
.rank-number {
            font-size: 3rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 10px;
        }
.rank-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }
.rank-info {
            color: var(--text);
            opacity: 0.8;
            font-size: 0.9rem;
            margin-bottom: 15px;
        }
.rank-tag {
            display: inline-block;
            background: var(--primary);
            color: var(--bg);
            padding: 3px 12px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-right: 8px;
            margin-bottom: 8px;
        }
.rank-desc { color: var(--text); font-size: 0.95rem; line-height: 1.6; }
.rank-badge {
            display: inline-block;
            background: var(--accent);
            color: var(--bg);
            padding: 5px 15px;
            font-weight: 700;
            font-size: 0.85rem;
            margin-bottom: 15px;
        }
.rank-table { width: 100%; border-collapse: collapse; }
.rank-table th {
            background: var(--primary);
            color: var(--bg);
            padding: 12px 15px;
            text-align: left;
            font-weight: 600;
            font-size: 0.9rem;
        }
.rank-table td {
            padding: 12px 15px;
            border-bottom: 1px solid rgba(8, 51, 68, 0.15);
            color: var(--text);
            font-size: 0.95rem;
        }
.rank-table tr:hover td { background: rgba(14, 165, 233, 0.08); }
.rank-table .rank-num {
            font-weight: 900;
            font-size: 1.2rem;
            color: var(--primary);
        }
.rank-up { color: #16a34a; font-weight: 600; }
.rank-down { color: #dc2626; font-weight: 600; }
.rank-same { color: #6b7280; }
.trend-up { color: #16a34a; }
.trend-down { color: #dc2626; }
.pagination-custom {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-top: 40px;
        }
.pagination-custom a {
            padding: 8px 16px;
            border: 2px solid var(--border);
            background: var(--bg);
            color: var(--text);
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
        }
.pagination-custom a:hover {
            background: var(--primary);
            color: var(--bg);
        }
.pagination-custom a.active {
            background: var(--primary);
            color: var(--bg);
        }
.update-info {
            background: rgba(14, 165, 233, 0.1);
            border-left: 4px solid var(--accent);
            padding: 15px 20px;
            margin-bottom: 40px;
            color: var(--text);
            font-size: 0.95rem;
        }
.genre-filter {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 30px;
        }
.genre-filter a {
            padding: 6px 18px;
            border: 2px solid var(--border);
            background: var(--bg);
            color: var(--text);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all 0.3s;
        }
.genre-filter a:hover, .genre-filter a.active {
            background: var(--primary);
            color: var(--bg);
        }
.last-updated {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
            opacity: 0.7;
            font-size: 0.85rem;
            margin-bottom: 20px;
        }
.last-updated i { color: var(--accent); }
.rank-card { padding: 15px; }
.rank-number { font-size: 2rem; }
.rank-title { font-size: 1.2rem; }

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