:root{
      --bg:#f5faff;
      --panel:#ffffff;
      --panel-soft:#edf6ff;
      --text:#10233e;
      --muted:#5c718d;
      --line:#dce9f7;
      --primary:#1f6feb;
      --primary-2:#56a8ff;
      --accent:#0ea5e9;
      --dark:#0f2747;
      --shadow:0 18px 50px rgba(16,35,62,.10);
      --radius:22px;
      --radius-sm:16px;
      --max:1180px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:"Inter",sans-serif;
      background:
        radial-gradient(circle at top left, rgba(86,168,255,.12), transparent 32%),
        linear-gradient(180deg,#f8fbff 0%,#f5faff 45%,#eef6ff 100%);
      color:var(--text);
      line-height:1.7;
    }

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

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

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

    .topbar{
      position:sticky;
      top:0;
      z-index:30;
      backdrop-filter:blur(12px);
      background:rgba(255,255,255,.86);
      border-bottom:1px solid rgba(220,233,247,.85);
    }

    .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;
      color:var(--dark);
      letter-spacing:.2px;
    }

    .brand-badge{
      width:42px;
      height:42px;
      border-radius:14px;
      background:linear-gradient(135deg,var(--primary),var(--primary-2));
      color:#fff;
      display:grid;
      place-items:center;
      font-weight:800;
      box-shadow:0 10px 28px rgba(31,111,235,.25);
    }

    .nav{
      display:flex;
      align-items:center;
      gap:14px;
      flex-wrap:wrap;
    }

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

    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:10px;
      min-height:48px;
      padding:0 22px;
      border-radius:999px;
      border:1px solid transparent;
      font-weight:700;
      transition:.25s ease;
      cursor:pointer;
      text-align:center;
    }

    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--primary),var(--accent));
      box-shadow:0 16px 34px rgba(31,111,235,.24);
    }

    .btn-primary:hover{
      transform:translateY(-1px);
      box-shadow:0 20px 40px rgba(31,111,235,.28);
    }

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

    .hero{
      padding:56px 0 36px;
    }

    .hero-grid{
      display:grid;
      grid-template-columns:1.18fr .82fr;
      gap:28px;
      align-items:stretch;
    }

    .hero-card,
    .side-card,
    .section-card,
    .cta-card,
    .faq-item,
    .info-card{
      background:var(--panel);
      border:1px solid rgba(220,233,247,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }

    .hero-card{
      padding:34px;
      position:relative;
      overflow:hidden;
      background:
        linear-gradient(135deg, rgba(31,111,235,.06), rgba(14,165,233,.02)),
        #fff;
    }

    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 14px;
      border-radius:999px;
      background:var(--panel-soft);
      color:var(--primary);
      font-size:13px;
      font-weight:700;
      margin-bottom:18px;
    }

    h1,h2,h3{
      margin:0 0 14px;
      line-height:1.18;
      color:var(--dark);
    }

    h1{
      font-family:"Playfair Display",serif;
      font-size:clamp(34px, 5vw, 58px);
      letter-spacing:-.02em;
    }

    h2{
      font-size:clamp(26px, 3.2vw, 38px);
    }

    h3{
      font-size:clamp(20px, 2vw, 24px);
    }

    p{
      margin:0 0 16px;
      color:var(--text);
    }

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

    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:22px;
    }

    .hero-points{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:14px;
      margin-top:28px;
    }

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

    .point strong{
      display:block;
      font-size:15px;
      color:var(--dark);
      margin-bottom:6px;
    }

    .point span{
      color:var(--muted);
      font-size:14px;
    }

    .side-card{
      overflow:hidden;
      display:flex;
      flex-direction:column;
    }

    /* 修复图片变形/错误裁切：使用与图片一致的 1200×800 比例（3:2） */
    .side-card .media{
      width:100%;
      aspect-ratio:3 / 2;
      overflow:hidden;
      background:#f2f8ff;
    }

    .side-card .media img{
      width:100%;
      height:100%;
      object-fit:cover;
      object-position:center center;
    }

    .side-card-content{
      padding:24px;
    }

    .mini-stats{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:12px;
      margin-top:14px;
    }

    .stat{
      padding:14px;
      border-radius:16px;
      background:var(--panel-soft);
      border:1px solid var(--line);
    }

    .stat strong{
      display:block;
      font-size:15px;
      margin-bottom:4px;
      color:var(--dark);
    }

    .stat span{
      color:var(--muted);
      font-size:14px;
    }

    main{
      padding-bottom:64px;
    }

    section{
      padding:22px 0;
    }

    .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:20px;
      margin-bottom:18px;
    }

    .section-head p{
      max-width:760px;
      color:var(--muted);
      margin:0;
    }

    .section-card{
      padding:28px;
    }

    .two-col{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:22px;
    }

    .compare-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:18px;
      margin-top:16px;
    }

    .compare-box{
      border:1px solid var(--line);
      border-radius:20px;
      overflow:hidden;
      background:#fff;
    }

    .compare-head{
      padding:18px 20px;
      font-weight:800;
      font-size:18px;
      color:#fff;
    }

    .compare-head.pico{
      background:linear-gradient(135deg,var(--primary),var(--accent));
    }

    .compare-head.qs{
      background:linear-gradient(135deg,#6b7ea0,#3d5677);
    }

    .compare-body{
      padding:20px;
    }

    ul{
      margin:0;
      padding-left:18px;
    }

    li{
      margin:0 0 10px;
      color:var(--text);
    }

    .table-wrap{
      overflow-x:auto;
      border:1px solid var(--line);
      border-radius:20px;
      background:#fff;
    }

    table{
      width:100%;
      border-collapse:collapse;
      min-width:760px;
    }

    th,td{
      text-align:left;
      padding:16px 18px;
      border-bottom:1px solid var(--line);
      vertical-align:top;
      font-size:15px;
    }

    th{
      background:#f7fbff;
      color:var(--dark);
      font-weight:800;
    }

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

    .cards-3{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:18px;
    }

    .info-card{
      padding:22px;
    }

    .info-card p:last-child{
      margin-bottom:0;
    }

    .note{
      margin-top:18px;
      padding:18px 20px;
      border-radius:18px;
      background:linear-gradient(135deg, rgba(31,111,235,.07), rgba(14,165,233,.05));
      border:1px solid var(--line);
      color:var(--muted);
      font-size:15px;
    }

    .cta-card{
      padding:34px;
      background:
        linear-gradient(135deg, rgba(31,111,235,.95), rgba(14,165,233,.90)),
        #0f2747;
      color:#fff;
      overflow:hidden;
      position:relative;
    }

    .cta-card h2,
    .cta-card p{
      color:#fff;
    }

    .cta-card p{
      max-width:760px;
      opacity:.92;
    }

    .cta-actions{
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      margin-top:18px;
    }

    .cta-card .btn-secondary{
      color:#fff;
      border-color:rgba(255,255,255,.32);
      background:rgba(255,255,255,.10);
    }

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

    .faq-item{
      padding:0;
      overflow:hidden;
    }

    .faq-item summary{
      list-style:none;
      cursor:pointer;
      padding:20px 22px;
      font-weight:800;
      color:var(--dark);
      position:relative;
    }

    .faq-item summary::-webkit-details-marker{
      display:none;
    }

    .faq-item summary::after{
      content:"+";
      position:absolute;
      right:22px;
      top:18px;
      font-size:24px;
      color:var(--primary);
    }

    .faq-item[open] summary::after{
      content:"–";
    }

    .faq-content{
      padding:0 22px 22px;
      color:var(--muted);
    }

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

    .author-avatar{
      width:58px;
      height:58px;
      border-radius:50%;
      display:grid;
      place-items:center;
      background:linear-gradient(135deg,var(--primary),var(--accent));
      color:#fff;
      font-weight:800;
      flex:0 0 auto;
    }

    .sticky-mobile-cta{
      display:none;
    }

    footer{
      padding:26px 0 40px;
      color:var(--muted);
      font-size:14px;
    }

    @media (max-width: 1024px){
      .hero-grid,
      .two-col,
      .cards-3,
      .compare-grid{
        grid-template-columns:1fr;
      }

      .hero-points{
        grid-template-columns:1fr;
      }

      .section-head{
        display:block;
      }
    }

    @media (max-width: 768px){
      .topbar-inner{
        min-height:64px;
      }

      .nav{
        display:none;
      }

      .container{
        width:min(var(--max), calc(100% - 20px));
      }

      .hero{
        padding:26px 0 18px;
      }

      .hero-card,
      .side-card-content,
      .section-card,
      .cta-card,
      .info-card{
        padding:20px;
      }

      h1{
        font-size:34px;
      }

      .lead{
        font-size:16px;
      }

      .btn{
        width:100%;
      }

      .sticky-mobile-cta{
        display:block;
        position:sticky;
        bottom:12px;
        z-index:40;
        padding:0 10px 12px;
      }

      .sticky-mobile-cta a{
        width:100%;
      }

      .author-box{
        flex-direction:column;
      }
    }