/* 天青石灰 · 浅色拟物厚重风 */
    :root{
      --primary:#0891b2;
      --accent:#0ea5e9;
      --bg:#ecfeff;
      --ink:#083344;
      --card-bg:#ffffff;
      --shadow-heavy:0 12px 30px rgba(8, 145, 178, 0.18), 0 4px 8px rgba(8, 145, 178, 0.1);
      --shadow-lift:0 18px 40px rgba(14, 165, 233, 0.28);
      --border-soft:1px solid rgba(8,145,178,0.15);
    }

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

    body{
      background-color: var(--bg);
      color: var(--ink);
      font-family: 'Inter', system-ui, -apple-system, sans-serif;
      background-image: radial-gradient(circle at 20% 20%, rgba(14,165,233,0.06) 0%, transparent 40%),
                        radial-gradient(circle at 80% 70%, rgba(8,145,178,0.05) 0%, transparent 50%);
      background-attachment: fixed;
      position: relative;
    }

    /* 噪点纹理覆盖 */
    body::before{
      content:"";
      position: fixed;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="80" height="80" viewBox="0 0 80 80"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="2" stitchTiles="stitch"/><feColorMatrix type="saturate" values="0"/></filter><rect width="100%" height="100%" filter="url(%23n)" opacity="0.04"/></svg>');
      opacity:0.8;
      z-index:1;
    }

    /* 滚动进度条 */
    #scrollProgress{
      position: fixed;
      top:0; left:0;
      width:0%;
      height:4px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      z-index: 2000;
      border-radius: 2px;
      box-shadow: 0 2px 6px rgba(8,145,178,0.4);
    }

    /* 全局布局：左固定侧栏 + 右瀑布流 */
    .layout{
      display: flex;
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 20px;
      gap: 30px;
      align-items: flex-start;
      position: relative;
      z-index: 5;
    }

    .sidebar{
      flex: 0 0 250px;
      position: sticky;
      top: 95px;
      z-index: 10;
      border-radius: 28px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(4px);
      box-shadow: var(--shadow-heavy);
      border: var(--border-soft);
      padding: 20px 15px;
      display: flex;
      flex-direction: column;
      gap: 22px;
    }

    .main-col{
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
      gap: 40px;
    }

    /* 卡片/区块拟物厚重 */
    .block-card{
      background: var(--card-bg);
      border-radius: 32px;
      box-shadow: var(--shadow-heavy);
      padding: 32px 28px;
      border: 1px solid rgba(8,145,178,0.08);
      transition: transform 0.2s ease, box-shadow 0.3s;
      background: linear-gradient(145deg, #ffffff 0%, #f8fdff 100%);
      position: relative;
    }

    .block-card:hover{
      box-shadow: var(--shadow-lift);
    }

    /* 标题超大 */
    .hero-title{
      font-size: clamp(2.8rem, 6vw, 4rem);
      font-weight: 900;
      letter-spacing: -0.02em;
      line-height: 1.1;
      color: var(--ink);
      text-shadow: 3px 3px 0 rgba(8,145,178,0.15);
    }

    .display-stat{
      font-family: 'Courier New', monospace;
      font-weight: 700;
      font-size: 3.2rem;
      line-height: 1;
      color: var(--primary);
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -1px;
    }

    /* 图标列表 */
    .icon-feature-item{
      display: flex;
      gap: 20px;
      padding: 16px 0;
      border-bottom: 1px dashed rgba(8,145,178,0.15);
      align-items: flex-start;
    }

    .icon-feature-item i{
      font-size: 2rem;
      min-width: 60px;
      color: var(--primary);
      background: rgba(8,145,178,0.08);
      border-radius: 18px;
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(14,165,233,0.2);
      box-shadow: inset 0 2px 4px rgba(255,255,255,0.6), 0 6px 10px rgba(8,145,178,0.1);
    }

    /* 表格风格 */
    .compare-table{
      width: 100%;
      border-collapse: separate;
      border-spacing: 0 10px;
    }

    .compare-table th{
      font-weight: 800;
      background: rgba(8,145,178,0.08);
      padding: 16px 12px;
      font-size: 1.1rem;
      border-radius: 20px 20px 0 0;
    }

    .compare-table td{
      background: white;
      padding: 18px 14px;
      border-bottom: 1px solid #e2f1f5;
      font-weight: 500;
    }

    /* 手风琴 */
    .accordion-custom{
      border-radius: 24px;
      overflow: hidden;
    }

    .accordion-item-custom{
      background: white;
      border-bottom: 1px solid rgba(8,145,178,0.1);
      padding: 4px 0;
    }

    .accordion-header-custom{
      font-weight: 700;
      padding: 18px 10px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: linear-gradient(90deg, rgba(14,165,233,0.06) 0%, transparent 80%);
      border-radius: 20px;
    }

    .accordion-header-custom i{
      color: var(--primary);
      transition: transform 0.3s;
    }

    .accordion-content-custom{
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 16px;
      color: #1c4e5e;
    }

    .accordion-item-custom.active .accordion-content-custom{
      max-height: 180px;
      padding-bottom: 18px;
    }

    .accordion-item-custom.active .fa-chevron-down{
      transform: rotate(180deg);
    }

    /* 图片卡片瀑布流 */
    .masonry-grid{
      column-count: 3;
      column-gap: 22px;
    }

    .masonry-card{
      break-inside: avoid;
      margin-bottom: 22px;
      background: white;
      border-radius: 22px;
      overflow: hidden;
      box-shadow: 0 8px 18px rgba(8,145,178,0.1);
      transition: transform 0.2s;
      position: relative;
      border: 1px solid #e0f2fe;
    }

    .masonry-card img{
      width: 100%;
      height: auto;
      display: block;
      background: #d6f0f5;
      opacity: 0;
      transition: opacity 0.6s ease, transform 0.5s;
      transform: scale(1.0);
    }

    .masonry-card img.loaded{
      opacity: 1;
    }

    .masonry-card:hover img{
      transform: scale(1.03);
    }

    .masonry-card .overlay-text{
      position: absolute;
      bottom: 0; left: 0; right: 0;
      padding: 30px 14px 14px;
      background: linear-gradient(0deg, rgba(8,145,178,0.8) 0%, transparent 100%);
      color: white;
      font-weight: 700;
      opacity: 0;
      transition: opacity 0.3s;
    }

    .masonry-card:hover .overlay-text{
      opacity: 1;
    }

    /* 侧栏导航 */
    .sidebar-links a{
      display: block;
      padding: 12px 15px;
      border-radius: 18px;
      font-weight: 600;
      color: var(--ink);
      text-decoration: none;
      transition: all 0.2s;
    }

    .sidebar-links a:hover{
      background: rgba(8,145,178,0.12);
      color: var(--primary);
      transform: translateX(4px);
    }

    .navbar-custom{
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 16px rgba(8,145,178,0.1);
      border-bottom: 1px solid rgba(8,145,178,0.2);
      padding: 15px 0;
      margin-bottom: 30px;
      z-index: 50;
    }

    .footer-area{
      background: #e3f2f5;
      border-radius: 40px 40px 0 0;
      padding: 40px 20px;
      margin-top: 30px;
      box-shadow: inset 0 8px 16px rgba(8,145,178,0.05);
    }

    @media (max-width: 900px) {
      .layout{
        flex-direction: column;
        padding: 0 15px;
      }
      .sidebar{
        position: static;
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
      }
      .masonry-grid{
        column-count: 2;
      }
      .sidebar-links{
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }
    }

    @media (max-width: 500px) {
      .masonry-grid{
        column-count: 1;
      }
      .hero-title{
        font-size: 2.5rem;
      }
    }

    /* 图片渐显占位 */
    .img-placeholder{
      background: linear-gradient(100deg, #dbebf0 30%, #cbe5ed 50%, #dbebf0 70%);
      background-size: 200% 100%;
      animation: shimmer 1.2s infinite;
    }
    @keyframes shimmer {
      0%{ background-position: 200% 0; }
      100%{ background-position: -200% 0; }
    }

    /* 通用 */
    .mono-data{
      font-family: 'Courier New', monospace;
      background: #e1f2f7;
      padding: 4px 10px;
      border-radius: 30px;
    }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .about-hero {
            background: linear-gradient(135deg, rgba(8,145,178,0.08) 0%, rgba(14,165,233,0.05) 100%);
            border-bottom: var(--border-soft);
            padding: 4rem 0 3rem;
        }
.about-section {
            margin-bottom: 3rem;
        }
.about-section h2 {
            color: var(--primary);
            font-weight: 800;
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            position: relative;
            padding-bottom: 0.6rem;
        }
.about-section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 48px;
            height: 3px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }
.about-section p {
            color: var(--ink);
            line-height: 1.9;
            margin-bottom: 1rem;
        }
.about-stat {
            text-align: center;
            padding: 1.5rem 1rem;
            background: var(--card-bg);
            border-radius: 16px;
            box-shadow: var(--shadow-heavy);
            border: var(--border-soft);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            height: 100%;
        }
.about-stat:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lift);
        }
.about-stat .stat-num {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--primary);
            display: block;
            margin-bottom: 0.3rem;
        }
.about-stat .stat-label {
            font-size: 0.95rem;
            color: var(--ink);
            font-weight: 500;
        }
.value-item {
            background: var(--card-bg);
            border-radius: 14px;
            padding: 1.5rem;
            height: 100%;
            border: var(--border-soft);
            box-shadow: var(--shadow-heavy);
            transition: transform 0.2s ease;
        }
.value-item:hover {
            transform: translateY(-3px);
        }
.value-item i {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 0.8rem;
            display: block;
        }
.value-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 0.6rem;
        }
.value-item p {
            font-size: 0.92rem;
            color: var(--ink);
            opacity: 0.85;
            line-height: 1.7;
            margin-bottom: 0;
        }
.about-list {
            padding-left: 1.2rem;
            color: var(--ink);
            line-height: 2;
        }
.about-list li {
            margin-bottom: 0.4rem;
        }
.about-list li::marker {
            color: var(--primary);
        }
.about-quote {
            background: linear-gradient(135deg, rgba(8,145,178,0.06), rgba(14,165,233,0.04));
            border-left: 4px solid var(--primary);
            padding: 1.2rem 1.5rem;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: var(--ink);
            margin: 1.5rem 0;
            line-height: 1.8;
        }
.about-hero {
                padding: 2.5rem 0 2rem;
            }
.about-section h2 {
                font-size: 1.35rem;
            }

/* --- 子页面追加 --- */
/* 本页专属少量样式，覆盖 Bootstrap 默认白底 */
    .privacy-card {
      background: var(--card-bg);
      color: var(--ink);
      border: var(--border-soft);
      border-radius: 20px;
      box-shadow: var(--shadow-heavy);
      padding: 1.8rem 2rem;
      transition: box-shadow 0.2s ease;
    }
.privacy-card:hover {
      box-shadow: var(--shadow-lift);
    }
.privacy-list {
      padding-left: 1.2rem;
      color: var(--ink);
    }
.privacy-list li {
      margin-bottom: 0.6rem;
      line-height: 1.6;
    }
.privacy-list li::marker {
      color: var(--primary);
      font-weight: 600;
    }
.privacy-link {
      color: var(--accent);
      font-weight: 500;
      text-decoration: underline;
      text-underline-offset: 2px;
    }
.privacy-link:hover {
      color: var(--primary);
    }
/* 覆盖 bootstrap 的容器内边距，贴合原风格 */
    .container {
      max-width: 1280px;
    }
hr {
      border-color: rgba(8, 145, 178, 0.15);
    }

/* --- 子页面追加 --- */
/* 确保 Bootstrap 组件不破坏深色氛围（少量覆盖） */
        .navbar-custom .nav-link { color: var(--ink); }
.navbar-custom .nav-link.active { color: var(--primary); font-weight: 700; }
.accordion-custom .accordion-item-custom { background: var(--card-bg); border: var(--border-soft); border-radius: 1rem; margin-bottom: 1rem; overflow: hidden; }
.accordion-custom .accordion-header-custom { background: rgba(8,145,178,0.08); padding: 1rem 1.5rem; font-weight: 600; color: var(--ink); border-bottom: 1px solid rgba(8,145,178,0.15); }
.accordion-custom .accordion-content-custom { padding: 1.5rem; color: var(--ink); }
/* 确保所有卡片背景白/透明，不使用默认白底 */
        .card, .card-body { background: var(--card-bg); color: var(--ink); border-color: rgba(8,145,178,0.15); }
.form-control, .form-select { background: rgba(255,255,255,0.6); color: var(--ink); border-color: rgba(8,145,178,0.3); }
.form-control::placeholder { color: rgba(8,51,68,0.4); }
.list-group-item { background: var(--card-bg); color: var(--ink); border-color: rgba(8,145,178,0.1); }