:root{
      --bg:#f5fbff;
      --white:#ffffff;
      --primary:#1f7aa8;
      --primary-dark:#145a7b;
      --accent:#dff4ff;
      --text:#1e2a32;
      --muted:#637381;
      --border:#dbe9f1;
      --shadow:0 10px 30px rgba(20,90,123,.08);
      --radius:18px;
      --max:1180px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter, Arial, Helvetica, sans-serif;
      color:var(--text);
      background:linear-gradient(180deg,#eefaff 0%, #f9fdff 100%);
      line-height:1.7;
    }

    img{
      max-width:100%;
      display:block;
      height:auto;
    }

    a{color:var(--primary);text-decoration:none}
    a:hover{text-decoration:underline}

    .container{
      width:min(var(--max), calc(100% - 32px));
      margin:0 auto;
    }

    .topbar{
      background:#eaf8ff;
      border-bottom:1px solid var(--border);
      font-size:14px;
      color:var(--muted);
    }
    .topbar .container{
      padding:10px 0;
      display:flex;
      justify-content:space-between;
      gap:12px;
      flex-wrap:wrap;
    }

    .hero{
      padding:42px 0 24px;
    }
    .hero-card{
      background:linear-gradient(135deg,#ffffff 0%, #eef9ff 100%);
      border:1px solid var(--border);
      border-radius:28px;
      box-shadow:var(--shadow);
      overflow:hidden;
      display:grid;
      grid-template-columns:1.15fr .85fr;
      gap:0;
    }
    .hero-copy{
      padding:48px 42px;
    }
    .eyebrow{
      display:inline-block;
      padding:8px 14px;
      background:var(--accent);
      color:var(--primary-dark);
      border-radius:999px;
      font-size:13px;
      font-weight:700;
      letter-spacing:.03em;
      text-transform:uppercase;
      margin-bottom:18px;
    }
    h1{
      margin:0 0 16px;
      font-size:clamp(32px,4vw,50px);
      line-height:1.15;
      letter-spacing:-0.02em;
    }
    .lead{
      font-size:18px;
      color:var(--muted);
      margin:0 0 24px;
      max-width:760px;
    }
    .hero-badges{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin:22px 0 0;
    }
    .badge{
      background:#fff;
      border:1px solid var(--border);
      padding:10px 14px;
      border-radius:999px;
      font-size:14px;
      color:var(--primary-dark);
      font-weight:600;
    }
    .hero-media{
      min-height:100%;
      background:linear-gradient(180deg,#dff4ff 0%, #f7fcff 100%);
      display:flex;
      align-items:center;
      justify-content:center;
      padding:28px;
      border-left:1px solid var(--border);
    }
    .hero-media figure{
      width:100%;
      max-width:500px;
      margin:0;
      background:#fff;
      border:1px solid var(--border);
      border-radius:22px;
      padding:14px;
      box-shadow:var(--shadow);
    }

    /* 关键修正：防止图片被拉伸或裁切 */
    .image-frame{
      width:100%;
      aspect-ratio:4 / 3;
      border-radius:16px;
      background:#eef7fb;
      overflow:hidden;
      display:flex;
      align-items:center;
      justify-content:center;
    }
    .hero-media .image-frame img{
      width:100%;
      height:100%;
      object-fit:contain;
      object-position:center;
      border-radius:16px;
      background:#eef7fb;
    }

    .hero-media figcaption{
      font-size:12px;
      color:var(--muted);
      padding-top:10px;
      text-align:center;
    }

    .breadcrumbs{
      font-size:14px;
      color:var(--muted);
      padding:18px 0 10px;
    }
    .breadcrumbs a{color:var(--muted)}
    .breadcrumbs span{margin:0 6px}

    .content-wrap{
      display:grid;
      grid-template-columns:minmax(0, 1fr) 320px;
      gap:28px;
      padding:18px 0 60px;
      align-items:start;
    }

    .article{
      background:var(--white);
      border:1px solid var(--border);
      border-radius:24px;
      box-shadow:var(--shadow);
      padding:36px;
      min-width:0;
    }

    .article-meta{
      display:flex;
      flex-wrap:wrap;
      gap:14px;
      font-size:14px;
      color:var(--muted);
      margin-bottom:20px;
      padding-bottom:18px;
      border-bottom:1px solid var(--border);
    }

    .article h2{
      font-size:30px;
      line-height:1.25;
      margin:38px 0 14px;
      color:#12384a;
    }
    .article h3{
      font-size:22px;
      margin:28px 0 10px;
      color:#1c526e;
    }
    .article p{
      margin:0 0 16px;
      font-size:17px;
    }
    .article ul, .article ol{
      margin:0 0 20px 22px;
      padding:0;
    }
    .article li{
      margin:0 0 10px;
      font-size:17px;
    }

    .note-box,
    .cta-box,
    .faq-box,
    .table-wrap{
      margin:24px 0;
      border-radius:20px;
      overflow:hidden;
      border:1px solid var(--border);
      background:#fbfeff;
    }

    .note-box{
      background:linear-gradient(135deg,#effaff 0%, #fafdff 100%);
      padding:22px;
    }

    .cta-box{
      background:linear-gradient(135deg,#1f7aa8 0%, #145a7b 100%);
      color:#fff;
      padding:28px;
      box-shadow:var(--shadow);
    }
    .cta-box h3{
      margin:0 0 10px;
      color:#fff;
      font-size:24px;
    }
    .cta-box p{
      margin:0 0 18px;
      color:rgba(255,255,255,.92);
    }
    .cta-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding:13px 18px;
      border-radius:999px;
      font-weight:700;
      border:1px solid transparent;
      transition:.2s ease;
    }
    .btn-primary{
      background:#fff;
      color:#145a7b;
    }
    .btn-primary:hover{
      background:#eef9ff;
      text-decoration:none;
    }
    .btn-outline{
      background:transparent;
      color:#fff;
      border-color:rgba(255,255,255,.35);
    }
    .btn-outline:hover{
      background:rgba(255,255,255,.08);
      text-decoration:none;
    }

    .table-wrap{
      overflow-x:auto;
      -webkit-overflow-scrolling:touch;
    }
    .table-wrap table{
      width:100%;
      border-collapse:collapse;
      min-width:640px;
    }
    .table-wrap th,
    .table-wrap td{
      padding:16px;
      border-bottom:1px solid var(--border);
      text-align:left;
      vertical-align:top;
      font-size:16px;
    }
    .table-wrap th{
      background:#edf9ff;
      color:#134661;
      font-size:15px;
    }

    .sidebar{
      position:sticky;
      top:18px;
      display:flex;
      flex-direction:column;
      gap:20px;
    }
    .side-card{
      background:var(--white);
      border:1px solid var(--border);
      border-radius:22px;
      box-shadow:var(--shadow);
      padding:24px;
    }
    .side-card h3{
      margin:0 0 14px;
      font-size:19px;
      color:#12384a;
    }
    .side-card p,
    .side-card li{
      font-size:15px;
      color:var(--muted);
    }
    .side-card ul{
      margin:0;
      padding-left:18px;
    }

    .faq-item{
      padding:22px 24px;
      border-bottom:1px solid var(--border);
    }
    .faq-item:last-child{border-bottom:none}
    .faq-item h3{
      margin:0 0 8px;
      font-size:20px;
      color:#12384a;
    }
    .faq-item p{
      margin:0;
    }

    .author-box{
      margin-top:34px;
      display:grid;
      grid-template-columns:72px 1fr;
      gap:16px;
      align-items:center;
      padding:20px;
      background:#f7fcff;
      border:1px solid var(--border);
      border-radius:20px;
    }
    .author-avatar{
      width:72px;
      height:72px;
      border-radius:50%;
      background:linear-gradient(135deg,#bde8fb,#eaf9ff);
      border:1px solid var(--border);
    }

    .footer{
      padding:42px 0 60px;
      color:var(--muted);
      font-size:14px;
    }
    .footer-card{
      background:#fff;
      border:1px solid var(--border);
      border-radius:24px;
      padding:24px;
      box-shadow:var(--shadow);
    }

    @media (max-width: 980px){
      .hero-card,
      .content-wrap{
        grid-template-columns:1fr;
      }
      .hero-media{
        border-left:none;
        border-top:1px solid var(--border);
      }
      .sidebar{
        position:static;
      }
    }

    @media (max-width: 680px){
      .container{
        width:min(var(--max), calc(100% - 20px));
      }
      .hero-copy,
      .article{
        padding:24px 20px;
      }
      .side-card{
        padding:20px;
      }
      h1{
        font-size:32px;
      }
      .article h2{
        font-size:26px;
      }
      .article h3{
        font-size:20px;
      }
      .lead,
      .article p,
      .article li{
        font-size:16px;
      }
      .hero-media{
        padding:18px;
      }
      .hero-media figure{
        padding:12px;
      }
    }