:root{
    --accent:#1e66d0;
    --accent-dark:#154a97;
    --text:#182230;
    --muted:#64748b;
    --bg:#f6f9fc;
    --card:#ffffff;
    --border:#e5edf5;
    --soft:#eef5ff;
    --radius:18px;
    --shadow:0 10px 30px rgba(15,23,42,.08);
    --max:1180px;
  }

  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    font-family:Arial,Helvetica,sans-serif;
    color:var(--text);
    background:var(--bg);
    line-height:1.7;
  }

  img{max-width:100%;display:block}
  a{color:var(--accent);text-decoration:none}
  a:hover{text-decoration:underline}

  .container{
    max-width:var(--max);
    margin:0 auto;
    padding:24px;
  }

  .topbar{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    margin-bottom:22px;
  }

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

  .brand strong{
    color:var(--accent-dark);
    font-size:18px;
    display:block;
    margin-bottom:2px;
  }

  .toplink{
    font-size:14px;
    color:var(--muted);
    word-break:break-word;
  }

  .hero{
    display:grid;
    grid-template-columns:1.15fr .85fr;
    gap:24px;
    align-items:stretch;
    margin-bottom:24px;
  }

  .card{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
  }

  .hero-copy{
    padding:30px;
  }

  .eyebrow{
    display:inline-block;
    font-size:13px;
    font-weight:700;
    letter-spacing:.04em;
    text-transform:uppercase;
    color:var(--accent-dark);
    background:var(--soft);
    padding:8px 12px;
    border-radius:999px;
    margin-bottom:14px;
  }

  h1{
    font-size:42px;
    line-height:1.15;
    margin:0 0 16px;
    color:#0f172a;
  }

  .lead{
    font-size:18px;
    color:#334155;
    margin:0 0 20px;
  }

  .hero-points{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:12px;
    margin:22px 0 24px;
    padding:0;
    list-style:none;
  }

  .hero-points li{
    background:#f8fbff;
    border:1px solid var(--border);
    border-radius:14px;
    padding:12px 14px;
    font-size:15px;
  }

  .cta-row{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    margin-top:6px;
  }

  .btn{
    display:inline-block;
    padding:13px 18px;
    border-radius:999px;
    font-weight:700;
    transition:.2s ease;
  }

  .btn-primary{
    background:var(--accent);
    color:#fff;
  }

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

  .btn-secondary{
    background:#fff;
    color:var(--accent-dark);
    border:1px solid var(--border);
  }

  .btn-secondary:hover{
    text-decoration:none;
    background:#f8fbff;
  }

  .hero-media{
    overflow:hidden;
    min-height:100%;
  }

  .hero-media img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
  }

  .section{
    margin-bottom:24px;
    padding:28px;
  }

  h2{
    font-size:30px;
    line-height:1.2;
    margin:0 0 14px;
    color:#0f172a;
  }

  h3{
    font-size:22px;
    margin:0 0 10px;
    color:#0f172a;
  }

  p{
    margin:0 0 14px;
  }

  .muted{color:var(--muted)}

  .toc ul,
  .content-list,
  .check-list{
    margin:0;
    padding-left:20px;
  }

  .toc li,
  .content-list li,
  .check-list li{
    margin-bottom:8px;
  }

  .grid-2{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:24px;
  }

  .grid-3{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:16px;
  }

  .mini-card{
    background:#f8fbff;
    border:1px solid var(--border);
    border-radius:16px;
    padding:18px;
  }

  .spec-table{
    width:100%;
    border-collapse:collapse;
    font-size:15px;
    overflow:hidden;
    border-radius:14px;
  }

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

  .spec-table th{
    width:34%;
    background:#f8fbff;
    color:#0f172a;
  }

  .highlight{
    background:linear-gradient(135deg,#eef5ff,#f9fbff);
    border:1px solid #d9e8ff;
    border-radius:16px;
    padding:18px;
  }

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

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

  /* 视频区域修正 */
  .video-block{
    margin-top:8px;
  }

  .video-frame,
  .video-link{
    position:relative;
    width:100%;
    aspect-ratio:16 / 9;
    border-radius:16px;
    overflow:hidden;
    border:1px solid var(--border);
    background:#000;
    display:block;
  }

  .video-frame iframe,
  .video-frame video,
  .video-link img{
    width:100%;
    height:100%;
    display:block;
    border:0;
    object-fit:cover;
  }

  .video-link{
    text-decoration:none;
  }

  .play-btn{
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    width:82px;
    height:82px;
    border-radius:50%;
    background:rgba(0,0,0,.68);
    display:flex;
    align-items:center;
    justify-content:center;
    box-shadow:0 6px 24px rgba(0,0,0,.25);
    pointer-events:none;
  }

  .play-btn::before{
    content:"";
    display:block;
    width:0;
    height:0;
    border-top:16px solid transparent;
    border-bottom:16px solid transparent;
    border-left:26px solid #fff;
    margin-left:6px;
  }

  .video-note{
    margin-top:12px;
    font-size:14px;
    color:var(--muted);
  }

  .contact-list p{
    margin-bottom:8px;
  }

  .footer{
    text-align:center;
    color:var(--muted);
    font-size:13px;
    padding:8px 0 20px;
  }

  @media (max-width:980px){
    .hero,
    .grid-2,
    .grid-3{
      grid-template-columns:1fr;
    }
    h1{font-size:34px}
    h2{font-size:26px}
    .hero-copy{padding:24px}
    .section{padding:22px}
  }

  @media (max-width:640px){
    .container{padding:16px}
    h1{font-size:30px}
    .lead{font-size:16px}
    .hero-points{grid-template-columns:1fr}
    .cta-row{flex-direction:column}
    .btn{text-align:center}
    .play-btn{
      width:68px;
      height:68px;
    }
    .play-btn::before{
      border-top:13px solid transparent;
      border-bottom:13px solid transparent;
      border-left:22px solid #fff;
    }
  }