:root{
      --bg:#f4f9ff;
      --panel:#ffffff;
      --soft:#eef6ff;
      --line:#d8e6f5;
      --ink:#10233d;
      --muted:#58708b;
      --brand:#1b6fdc;
      --brand-2:#5db5ff;
      --shadow:0 18px 60px rgba(13,39,80,.10);
      --radius:22px;
      --radius-lg:28px;
      --max:1180px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:"Inter",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at top right, rgba(93,181,255,.16), transparent 28%),
        linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%);
      line-height:1.7;
    }

    img{
      display:block;
      max-width:100%;
      height:auto;
      border:0;
    }

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

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

    .topbar{
      border-bottom:1px solid rgba(216,230,245,.75);
      background:rgba(255,255,255,.72);
      backdrop-filter:blur(14px);
      position:sticky;
      top:0;
      z-index:30;
    }

    .topbar-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      min-height:72px;
    }

    .brand{
      display:flex;
      align-items:center;
      gap:12px;
      font-weight:800;
      letter-spacing:.2px;
      color:var(--ink);
    }

    .brand-badge{
      width:42px;
      height:42px;
      border-radius:14px;
      background:linear-gradient(135deg, var(--brand), var(--brand-2));
      box-shadow:0 10px 25px rgba(27,111,220,.24);
      position:relative;
      flex:none;
    }

    .brand-badge:before{
      content:"";
      position:absolute;
      inset:10px;
      border-radius:10px;
      background:rgba(255,255,255,.92);
    }

    .nav{
      display:flex;
      align-items:center;
      gap:18px;
      flex-wrap:wrap;
    }

    .nav a{
      color:var(--muted);
      font-weight:600;
      font-size:14px;
    }

    .nav .btn{
      color:#fff;
    }

    .hero{
      padding:54px 0 28px;
    }

    .hero-grid{
      display:grid;
      grid-template-columns:1.12fr .88fr;
      gap:26px;
      align-items:stretch;
    }

    .card{
      background:var(--panel);
      border:1px solid rgba(216,230,245,.95);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow);
    }

    .hero-copy{
      padding:36px;
      position:relative;
      overflow:hidden;
    }

    .hero-copy:after{
      content:"";
      position:absolute;
      right:-60px;
      top:-60px;
      width:220px;
      height:220px;
      background:radial-gradient(circle, rgba(93,181,255,.18), transparent 70%);
      pointer-events:none;
    }

    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding:9px 14px;
      border-radius:999px;
      background:var(--soft);
      border:1px solid var(--line);
      color:var(--brand);
      font-weight:700;
      font-size:13px;
      letter-spacing:.2px;
    }

    h1,h2,h3{
      margin:0 0 16px;
      line-height:1.18;
      letter-spacing:-.02em;
    }

    h1{
      font-family:"Playfair Display", serif;
      font-size:clamp(34px, 5vw, 58px);
      margin-top:18px;
    }

    h2{
      font-size:clamp(24px, 3.2vw, 34px);
      margin-bottom:18px;
    }

    h3{
      font-size:20px;
      margin-bottom:12px;
    }

    .lead{
      font-size:18px;
      color:var(--muted);
      max-width:760px;
      margin:0 0 24px;
    }

    .hero-meta{
      display:flex;
      gap:14px;
      flex-wrap:wrap;
      margin:18px 0 26px;
      color:var(--muted);
      font-size:14px;
      font-weight:600;
    }

    .hero-meta span{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:10px 14px;
      border-radius:999px;
      background:#fff;
      border:1px solid var(--line);
    }

    .cta-row{
      display:flex;
      flex-wrap:wrap;
      gap:14px;
      margin-top:10px;
    }

    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:10px;
      min-height:48px;
      padding:0 20px;
      border-radius:14px;
      font-weight:800;
      font-size:15px;
      border:1px solid transparent;
      transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
    }

    .btn:hover{
      transform:translateY(-1px);
      text-decoration:none;
    }

    .btn-primary{
      background:linear-gradient(135deg, var(--brand), var(--brand-2));
      color:#fff;
      box-shadow:0 14px 34px rgba(27,111,220,.25);
    }

    .btn-secondary{
      background:#fff;
      color:var(--ink);
      border-color:var(--line);
    }

    .hero-side{
      padding:26px;
      display:grid;
      gap:18px;
      background:linear-gradient(180deg, rgba(255,255,255,1), rgba(244,250,255,.98));
    }

    .hero-image-box,
    .article-image{
      margin:0;
      border-radius:22px;
      border:1px solid var(--line);
      background:#fff;
      overflow:hidden;
      box-shadow:0 10px 28px rgba(17,35,61,.06);
    }

    /* 一次性解决变形：所有图片统一进入固定比例盒子，图片永远 contain */
    .media-box{
      width:100%;
      background:#f7fbff;
      display:flex;
      align-items:center;
      justify-content:center;
      overflow:hidden;
      position:relative;
    }

    .media-box img{
      width:auto !important;
      height:auto !important;
      max-width:100% !important;
      max-height:100% !important;
      object-fit:contain !important;
      object-position:center center !important;
      flex:0 0 auto;
      background:#f7fbff;
    }

    .hero-image-box .media-box{
      aspect-ratio:1200 / 630;
      padding:16px;
    }

    .article-image{
      margin:24px 0;
    }

    .article-image .media-box{
      padding:20px;
    }

    .article-image.banner .media-box{ aspect-ratio:1200 / 630; }
    .article-image.large  .media-box{ aspect-ratio:1200 / 800; }
    .article-image.square .media-box{ aspect-ratio:1 / 1; }

    .article-image.natural .media-box{
      aspect-ratio:auto;
      padding:0;
      display:block;
    }

    .article-image.natural .media-box img{
      width:100% !important;
      max-width:100% !important;
      height:auto !important;
      max-height:none !important;
    }

    .image-caption,
    .article-image figcaption{
      padding:14px 16px;
      border-top:1px solid var(--line);
      background:#fbfdff;
      color:var(--muted);
      font-size:13px;
      line-height:1.65;
      min-height:1px;
    }

    .mini-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:14px;
    }

    .mini-card{
      background:#fff;
      border:1px solid var(--line);
      border-radius:18px;
      padding:16px;
    }

    .mini-card strong{
      display:block;
      font-size:18px;
      margin-bottom:4px;
    }

    .mini-card span{
      color:var(--muted);
      font-size:14px;
      font-weight:600;
    }

    main{
      padding:10px 0 70px;
    }

    .section{
      margin-top:26px;
    }

    .section-card{
      padding:34px;
    }

    .content-grid{
      display:grid;
      grid-template-columns:minmax(0, 1fr) 320px;
      gap:26px;
      align-items:start;
    }

    .article-body p{
      margin:0 0 18px;
      color:#27415e;
      font-size:16.5px;
    }

    .article-body ul,
    .article-body ol{
      margin:0 0 18px 0;
      padding-left:22px;
      color:#27415e;
    }

    .article-body li{
      margin-bottom:10px;
    }

    .article-body strong{
      color:var(--ink);
    }

    .highlight-box{
      margin:22px 0;
      padding:22px;
      border-radius:20px;
      background:linear-gradient(180deg, #f8fbff, #eef6ff);
      border:1px solid var(--line);
    }

    .quote-box{
      margin:22px 0;
      padding:24px;
      border-left:5px solid var(--brand);
      border-radius:18px;
      background:#f8fbff;
      color:#27415e;
      font-size:17px;
      font-weight:600;
    }

    .check-grid{
      display:grid;
      grid-template-columns:repeat(2, minmax(0,1fr));
      gap:14px;
      margin:18px 0 8px;
    }

    .check{
      padding:18px;
      border:1px solid var(--line);
      border-radius:18px;
      background:#fff;
      color:#27415e;
    }

    .check strong{
      display:block;
      margin-bottom:6px;
      color:var(--ink);
    }

    .sidebar{
      position:sticky;
      top:94px;
      display:grid;
      gap:18px;
    }

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

    .toc{
      list-style:none;
      padding:0;
      margin:0;
    }

    .toc li + li{
      margin-top:10px;
    }

    .toc a{
      display:block;
      padding:10px 12px;
      border-radius:12px;
      color:var(--muted);
      font-weight:700;
      font-size:14px;
      background:#f8fbff;
      border:1px solid transparent;
    }

    .toc a:hover{
      border-color:var(--line);
      color:var(--brand);
      text-decoration:none;
    }

    .spec-table{
      width:100%;
      border-collapse:collapse;
      margin:18px 0 10px;
      overflow:hidden;
      border-radius:18px;
      border:1px solid var(--line);
      background:#fff;
    }

    .spec-table th,
    .spec-table td{
      padding:14px 16px;
      text-align:left;
      vertical-align:top;
      border-bottom:1px solid var(--line);
      font-size:15px;
    }

    .spec-table th{
      background:#f2f8ff;
      color:var(--ink);
      font-size:14px;
      letter-spacing:.2px;
      text-transform:uppercase;
    }

    .spec-table tr:last-child td{
      border-bottom:none;
    }

    .cta-band{
      margin-top:28px;
      padding:28px;
      border-radius:24px;
      background:linear-gradient(135deg, rgba(27,111,220,.96), rgba(93,181,255,.94));
      color:#fff;
      box-shadow:0 20px 50px rgba(17,76,157,.25);
    }

    .cta-band h2{
      color:#fff;
      margin-bottom:12px;
    }

    .cta-band p{
      margin:0 0 18px;
      color:rgba(255,255,255,.92);
      font-size:16px;
    }

    .cta-band .btn-secondary{
      background:rgba(255,255,255,.14);
      border-color:rgba(255,255,255,.28);
      color:#fff;
    }

    .faq{
      display:grid;
      gap:14px;
    }

    details{
      border:1px solid var(--line);
      border-radius:18px;
      background:#fff;
      padding:16px 18px;
    }

    summary{
      cursor:pointer;
      font-weight:800;
      color:var(--ink);
      list-style:none;
    }

    summary::-webkit-details-marker{display:none}
    details p{
      margin:12px 0 2px;
      color:#27415e;
    }

    .footer{
      padding:34px 0 60px;
      color:var(--muted);
      font-size:14px;
    }

    .badge-row{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:12px;
    }

    .badge{
      padding:8px 12px;
      border-radius:999px;
      background:var(--soft);
      border:1px solid var(--line);
      color:var(--brand);
      font-weight:700;
      font-size:13px;
    }

    @media (max-width:1080px){
      .hero-grid,
      .content-grid{
        grid-template-columns:1fr;
      }
      .sidebar{
        position:static;
      }
    }

    @media (max-width:760px){
      .topbar-inner{
        min-height:64px;
      }
      .nav{
        display:none;
      }
      .hero-copy,
      .section-card,
      .hero-side,
      .side-card,
      .cta-band{
        padding:22px;
      }
      .mini-grid,
      .check-grid{
        grid-template-columns:1fr;
      }
      .hero-meta{
        gap:10px;
      }
      .hero-meta span{
        width:100%;
        justify-content:flex-start;
      }
      .btn{
        width:100%;
      }
      .cta-row{
        flex-direction:column;
      }
      .hero-image-box .media-box,
      .article-image .media-box{
        padding:12px;
      }
    }