:root{
      --bg:#f4f9ff;
      --card:#ffffff;
      --text:#14304d;
      --muted:#5f7894;
      --line:#d7e7f6;
      --brand:#1c7ed6;
      --brand-dark:#155fa5;
      --soft:#eaf4ff;
      --accent:#66b3ff;
      --shadow:0 16px 40px rgba(20,48,77,.08);
      --radius-xl:26px;
      --radius-lg:18px;
      --radius-md:12px;
      --max:1160px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:'Inter',sans-serif;
      background:linear-gradient(180deg,#f7fbff 0%,#eef6ff 100%);
      color:var(--text);
      line-height:1.75;
    }

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

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

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

    .hero{
      padding:56px 0 26px;
    }

    .hero-card{
      background:linear-gradient(135deg,#ffffff 0%,#eef7ff 100%);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      overflow:hidden;
    }

    .hero-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:28px;
      align-items:center;
      padding:34px;
    }

    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:10px;
      background:var(--soft);
      color:var(--brand-dark);
      padding:8px 14px;
      border-radius:999px;
      font-size:.9rem;
      font-weight:700;
      margin-bottom:14px;
    }

    h1{
      font-size:clamp(2rem,4vw,3.35rem);
      line-height:1.12;
      margin:0 0 16px;
      letter-spacing:-.03em;
    }

    .lead{
      font-size:1.08rem;
      color:var(--muted);
      margin:0 0 22px;
      max-width:720px;
    }

    .hero-meta{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:16px;
      color:var(--muted);
      font-size:.94rem;
    }

    .chip{
      background:#fff;
      border:1px solid var(--line);
      border-radius:999px;
      padding:8px 12px;
    }

    .hero-media{
      background:#fff;
      border:1px solid var(--line);
      border-radius:22px;
      padding:16px;
      box-shadow:var(--shadow);
    }

    /* 关键修正：设备图不再 cover 裁切，改为 contain */
    .hero-media .image-frame{
      width:100%;
      aspect-ratio:4/3;
      border-radius:16px;
      background:#edf5fd;
      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 center;
      border-radius:16px;
      background:#edf5fd;
    }

    .img-note{
      font-size:.86rem;
      color:var(--muted);
      margin-top:10px;
    }

    .section{
      padding:26px 0;
    }

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

    .article{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      padding:34px;
      min-width:0;
    }

    .sidebar{
      position:sticky;
      top:24px;
      display:flex;
      flex-direction:column;
      gap:18px;
    }

    .side-card{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:22px;
      box-shadow:var(--shadow);
      padding:20px;
    }

    .side-card h3{
      margin:0 0 12px;
      font-size:1.05rem;
    }

    .toc a{
      display:block;
      padding:9px 0;
      color:var(--text);
      border-bottom:1px dashed var(--line);
      font-size:.96rem;
    }

    .toc a:last-child{border-bottom:none}

    h2{
      font-size:1.7rem;
      line-height:1.2;
      margin:34px 0 14px;
      letter-spacing:-.02em;
    }

    h3{
      font-size:1.18rem;
      margin:24px 0 10px;
    }

    p{margin:0 0 16px}
    ul,ol{padding-left:20px;margin:0 0 18px}
    li{margin:0 0 10px}

    .summary-box,
    .cta-box,
    .info-box{
      border:1px solid var(--line);
      border-radius:20px;
      padding:22px;
      margin:22px 0;
    }

    .summary-box{
      background:linear-gradient(180deg,#f8fbff 0%,#eef7ff 100%);
    }

    .info-box{
      background:#fcfeff;
    }

    .cta-box{
      background:linear-gradient(135deg,#eaf4ff 0%,#f7fbff 100%);
    }

    .btn{
      display:inline-block;
      background:var(--brand);
      color:#fff;
      padding:12px 18px;
      border-radius:999px;
      font-weight:700;
      margin-top:8px;
      box-shadow:0 10px 24px rgba(28,126,214,.22);
    }

    .btn:hover{
      background:var(--brand-dark);
      text-decoration:none;
    }

    table{
      width:100%;
      border-collapse:collapse;
      margin:18px 0 24px;
      font-size:.97rem;
      overflow:hidden;
      border-radius:16px;
    }

    th,td{
      border:1px solid var(--line);
      padding:14px 12px;
      text-align:left;
      vertical-align:top;
    }

    th{
      background:#edf6ff;
      font-weight:800;
    }

    .quote{
      padding:18px 20px;
      border-left:4px solid var(--brand);
      background:#f7fbff;
      border-radius:0 14px 14px 0;
      color:#294866;
      margin:18px 0 22px;
    }

    .faq-item{
      border:1px solid var(--line);
      border-radius:16px;
      padding:18px;
      margin:12px 0;
      background:#fff;
    }

    .faq-item h3{
      margin:0 0 8px;
      font-size:1.05rem;
    }

    .image-block{
      margin:24px 0;
      padding:16px;
      background:#fbfdff;
      border:1px solid var(--line);
      border-radius:18px;
    }

    /* 文章里的设备图同样修正 */
    .image-block .image-frame{
      width:100%;
      aspect-ratio:4/3;
      border-radius:14px;
      background:#edf5fd;
      overflow:hidden;
      display:flex;
      align-items:center;
      justify-content:center;
    }

    .image-block .image-frame img{
      width:100%;
      height:100%;
      object-fit:contain;
      object-position:center center;
      border-radius:14px;
      background:#edf5fd;
    }

    .footer-cta{
      margin-top:24px;
    }

    .author-box{
      display:flex;
      gap:16px;
      align-items:flex-start;
      padding:20px;
      border:1px solid var(--line);
      border-radius:18px;
      background:#fbfdff;
      margin-top:28px;
    }

    .author-dot{
      width:52px;
      height:52px;
      border-radius:50%;
      background:linear-gradient(135deg,#cfe8ff,#8fc5ff);
      flex:0 0 52px;
    }

    footer{
      padding:10px 0 50px;
      color:var(--muted);
      font-size:.95rem;
    }

    @media (max-width: 980px){
      .hero-grid,
      .content-wrap{
        grid-template-columns:1fr;
      }

      .sidebar{
        position:static;
      }

      .article{
        padding:24px;
      }
    }

    @media (max-width: 640px){
      .container{
        width:min(var(--max),calc(100% - 18px));
      }

      .hero-grid{
        padding:18px;
      }

      .article{
        padding:18px;
      }

      h1{
        font-size:2rem;
      }

      h2{
        font-size:1.42rem;
      }

      .hero-media .image-frame,
      .image-block .image-frame{
        aspect-ratio:4/3;
      }
    }