:root {
      --primary: #0891b2;
      --accent: #0ea5e9;
      --bg: #ecfeff;
      --ink: #083344;
      --line: #99c2d4;
      --light-line: #b6d7e2;
    }
    body {
      background-color: var(--bg);
      color: var(--ink);
      font-family: 'Inter', 'Source Han Sans CN', '思源黑体', 'Microsoft YaHei', sans-serif;
      font-weight: 400;
      letter-spacing: 0.01em;
    }
    h1, h2, h3, .serif-title {
      font-family: 'Source Han Serif SC', 'Noto Serif SC', '思源宋体', 'Georgia', serif;
      font-weight: 700;
    }
    .bg-deco {
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      pointer-events: none;
      z-index: 0;
      overflow: hidden;
    }
    .bg-deco .shape {
      position: absolute;
      opacity: 0.15;
    }
    .bg-deco .circle { width: 280px; height: 280px; border-radius: 50%; background: var(--primary); top: 10%; left: -60px; }
    .bg-deco .square { width: 180px; height: 180px; background: var(--accent); bottom: 5%; right: -50px; transform: rotate(20deg); }
    .bg-deco .triangle { width: 0; height: 0; border-left: 120px solid transparent; border-right: 120px solid transparent; border-bottom: 180px solid var(--primary); top: 45%; left: 80%; transform: rotate(10deg); }
    .content-wrap { position: relative; z-index: 2; }
    
    /* 极简无阴影，纯描边 */
    .bordered-box {
      border: 1px solid var(--line);
      background: transparent;
      border-radius: 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      letter-spacing: 1px;
      border-bottom: 2px solid var(--primary);
      display: inline-block;
      padding-bottom: 6px;
      margin-bottom: 2rem;
    }
    .navbar {
      border-bottom: 2px solid var(--line);
      background: rgba(236, 254, 255, 0.7);
      backdrop-filter: blur(8px);
      padding: 0.8rem 0;
    }
    .navbar-brand {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary) !important;
      letter-spacing: -0.5px;
      border-right: 2px solid var(--line);
      padding-right: 20px;
    }
    .navbar-brand i {
      color: var(--primary);
      margin-right: 8px;
    }
    .nav-link {
      color: var(--ink) !important;
      font-weight: 500;
      margin: 0 12px;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      border-bottom-color: var(--primary);
    }
    .nav-item.active .nav-link {
      color: var(--primary) !important;
      border-bottom-color: var(--primary);
    }
    
    .hero-section {
      padding: 6rem 0 3rem;
    }
    .hero-number {
      font-size: 5.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      letter-spacing: -2px;
      font-family: 'Inter', sans-serif;
    }
    .stat-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      margin: 2rem 0;
    }
    .stat-item {
      flex: 1 1 140px;
      border-left: 4px solid var(--accent);
      padding-left: 1rem;
    }
    .stat-item .num {
      font-size: 3rem;
      font-weight: 800;
      color: var(--ink);
      line-height: 1.2;
    }
    .stat-item .label {
      color: var(--ink);
      opacity: 0.75;
      font-weight: 500;
    }
    
    /* timeline */
    .timeline {
      border-left: 2px solid var(--primary);
      padding-left: 2rem;
      position: relative;
    }
    .timeline-item {
      margin-bottom: 2.5rem;
      position: relative;
    }
    .timeline-item::before {
      content: "";
      position: absolute;
      left: -2.65rem;
      top: 0.4rem;
      width: 14px; height: 14px;
      background: var(--bg);
      border: 3px solid var(--primary);
      border-radius: 50%;
    }
    .timeline-item h4 {
      font-weight: 700;
      color: var(--primary);
    }
    
    /* tabs for features */
    .nav-tabs .nav-link {
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 0;
      color: var(--ink);
      padding: 0.5rem 2rem;
      font-weight: 600;
      margin-right: 8px;
    }
    .nav-tabs .nav-link.active {
      background: var(--primary);
      border-color: var(--primary);
      color: #fff;
    }
    .tab-content {
      border: 1px solid var(--line);
      border-top: none;
      padding: 2rem;
      min-height: 220px;
    }
    
    /* hover播放按钮效果 */
    .card-poster {
      background: linear-gradient(145deg, #a1c9d9, #bcdbe8);
      border: 1px solid var(--line);
      min-height: 240px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      transition: all 0.2s;
    }
    .card-poster .play-icon {
      position: absolute;
      font-size: 3.5rem;
      color: white;
      opacity: 0;
      transform: scale(0.8);
      transition: 0.2s;
      text-shadow: 0 0 20px rgba(8, 51, 68, 0.7);
    }
    .card-poster:hover .play-icon {
      opacity: 1;
      transform: scale(1);
    }
    .card-poster i {
      color: var(--primary);
      font-size: 3rem;
    }
    
    .faq-item {
      border: 1px solid var(--line);
      padding: 1.2rem 1.5rem;
      margin-bottom: 1rem;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.15rem;
    }
    
    .friend-links {
      border-top: 2px solid var(--line);
      padding: 2rem 0 1rem;
      margin-top: 3rem;
    }
    .footer {
      border-top: 2px solid var(--line);
      padding: 1.5rem 0 3rem;
      margin-top: 2rem;
      color: var(--ink);
      opacity: 0.9;
    }
    
    /* 懒加载占位 */
    .lazy-img {
      background: #d5e9f0;
      animation: fadeGlow 1.5s infinite alternate;
      min-height: 200px;
    }
    @keyframes fadeGlow {
      from { opacity: 0.4; } to { opacity: 0.8; }
    }
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }
    
    @media (max-width: 768px) {
      .hero-number { font-size: 3.8rem; }
      .navbar-brand { font-size: 1.4rem; }
    }

/* 确保reveal最终可见 */
    .reveal.visible { opacity: 1 !important; transform: none !important; }

/* --- 子页面追加 --- */
/* 覆盖 Bootstrap 组件的默认白底黑字 */
    .card, .card-body, .card-title, .card-text,
    .form-control, .form-select, .form-label,
    .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-color: transparent;
      color: var(--ink);
      border-color: var(--line);
    }
/* 关于页卡片 */
    .about-card {
      background: rgba(255,255,255,0.55);
      border: 1px solid var(--light-line);
      border-radius: 14px;
      padding: 2rem 1.8rem;
      height: 100%;
      transition: box-shadow .25s ease, transform .25s ease;
    }
.about-card:hover {
      box-shadow: 0 10px 30px rgba(8,145,178,0.12);
      transform: translateY(-3px);
    }
.about-card .icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }
/* 小标题强调 */
    .about-section-title {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--ink);
      margin-top: 3.5rem;
      margin-bottom: 1.2rem;
      position: relative;
      padding-left: 1rem;
      border-left: 4px solid var(--primary);
    }
/* 段落 */
    .about-text {
      color: var(--ink);
      opacity: .85;
      line-height: 1.8;
      font-size: 1rem;
    }
/* 数据条 */
    .about-stat {
      background: rgba(8,145,178,0.08);
      border-radius: 10px;
      padding: 1rem 1.5rem;
      text-align: center;
      border: 1px solid var(--light-line);
    }
.about-stat .num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
    }
.about-stat .label {
      font-size: .9rem;
      color: var(--ink);
      opacity: .7;
    }
/* 引用块 */
    .about-quote {
      background: linear-gradient(135deg, rgba(8,145,178,.08), rgba(14,165,233,.05));
      border-left: 4px solid var(--accent);
      border-radius: 0 10px 10px 0;
      padding: 1.5rem 2rem;
      font-style: italic;
      color: var(--ink);
      margin: 2.5rem 0;
      font-size: 1.05rem;
    }
.about-section-title { font-size: 1.35rem; }
.about-card { padding: 1.5rem 1.2rem; }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .disclaimer-block {
            background: rgba(255,255,255,.4);
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 2rem;
            margin-bottom: 1.5rem;
        }
.disclaimer-block h3 {
            color: var(--primary);
            font-weight: 700;
            margin-bottom: 1rem;
            font-size: 1.25rem;
        }
.disclaimer-block p {
            color: var(--ink);
            line-height: 1.8;
            margin-bottom: .8rem;
        }
.disclaimer-block ul {
            color: var(--ink);
            padding-left: 1.2rem;
            line-height: 1.8;
        }
.disclaimer-block ul li {
            margin-bottom: .4rem;
        }
.contact-badge {
            background: var(--primary);
            color: #fff;
            padding: .2rem .8rem;
            border-radius: 20px;
            font-size: .9rem;
            display: inline-block;
            margin: .2rem;
        }
.disclaimer-block {
                padding: 1.2rem;
            }

/* --- 子页面追加 --- */
/* 本页专属微调,保持与首页整体视觉一致 */
    .privacy-hero { position: relative; padding: 5rem 0 3rem; text-align: center; }
.privacy-hero h1 { font-size: 2.5rem; font-weight: 800; color: var(--ink); margin-bottom: .75rem; }
.privacy-hero .subtitle { font-size: 1.1rem; color: var(--ink); opacity: .7; max-width: 720px; margin: 0 auto 2rem; }
.privacy-section { padding: 2.5rem 0; }
.privacy-section .section-title { font-size: 1.6rem; font-weight: 700; color: var(--primary); margin-bottom: 1.25rem; position: relative; padding-left: 1rem; }
.privacy-section .section-title::before { content: ''; position: absolute; left: 0; top: 6px; bottom: 6px; width: 4px; border-radius: 4px; background: linear-gradient(180deg, var(--primary), var(--accent)); }
.privacy-section p, .privacy-section li { color: var(--ink); line-height: 1.9; font-size: .98rem; }
.privacy-section ul { padding-left: 1.5rem; }
.privacy-section ul li { margin-bottom: .6rem; position: relative; }
.privacy-section ul li::marker { color: var(--primary); }
.privacy-box { background: rgba(8, 145, 178, .04); border: 1px solid var(--light-line); border-radius: 16px; padding: 2rem; margin-bottom: 1.5rem; }
.privacy-box h3 { font-size: 1.15rem; font-weight: 600; color: var(--ink); margin-bottom: .9rem; }
.privacy-box h3 i { color: var(--primary); margin-right: .5rem; }
.last-updated { display: inline-block; background: rgba(8,145,178,.1); color: var(--primary); font-size: .85rem; padding: .3rem 1rem; border-radius: 20px; margin-bottom: 1.5rem; }
.privacy-hero .deco-badge { font-size: .95rem; color: var(--primary); font-weight: 500; background: rgba(8,145,178,.08); display: inline-block; padding: .4rem 1.2rem; border-radius: 30px; margin-bottom: 1rem; border: 1px solid rgba(8,145,178,.2); }
.privacy-hero h1 { font-size: 1.8rem; }
.privacy-box { padding: 1.4rem; }
.privacy-section .section-title { font-size: 1.35rem; }