:root{
      --bg:#ffffff;--card:#ffffff;--muted:#5b6472;--text:#0b0c0f;--brand:#0ea5e9;--brand-2:#22c55e;--ring:#2563eb;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,\"PingFang SC\",\"Hiragino Sans GB\",\"Microsoft YaHei\",sans-serif;color:var(--text);background:#fff}

    .page{display:grid;grid-template-columns:320px 1fr;min-height:100vh;background:#fff}
    .sidebar{background:#f7f8fa;border-right:1px solid #e5e7eb;padding:20px;position:sticky;top:0;height:100vh;overflow:auto}
    .brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.3px}
    .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));box-shadow:0 0 10px rgba(34,197,94,.35)}
    .brand small{color:var(--muted);font-weight:500}

    .search{margin:16px 0 10px;display:flex;align-items:center;border:1px solid #e5e7eb;border-radius:12px;background:#fff;padding:10px 12px;gap:6px}
    .search input{all:unset;width:100%;color:var(--text)}
    .search svg{opacity:.6}

    .product-list{display:grid;gap:10px}
    .card{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:10px;cursor:pointer;transition:.2s transform,.2s border-color,.2s background-color}
    .card:hover{transform:translateY(-1px);border-color:#cbd5e1;background:#fafafa}
    .card.active{border-color:var(--ring);box-shadow:0 0 0 2px rgba(37,99,235,.15) inset}
    .thumb{width:56px;height:56px;border-radius:12px;background:#f3f4f6;display:grid;place-items:center;overflow:hidden;border:1px solid #e5e7eb}
    .thumb img{max-width:100%;max-height:100%;display:block}
    .meta{display:flex;flex-direction:column;gap:3px}
    .title{font-size:14px;font-weight:600}
    .subtitle{font-size:12px;color:var(--muted)}

    .main{padding:24px 28px;background:#fff}
    .player{background:#fff;border:1px solid #e5e7eb;border-radius:18px;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.06)}
    .player-top{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid #e5e7eb;background:#f8fafc}
    .crumb{display:flex;align-items:center;gap:8px;color:#4b5563;font-size:13px}
    .crumb strong{color:#111827}
    .actions{display:flex;align-items:center;gap:10px}
    .btn{appearance:none;border:1px solid #e5e7eb;background:#fff;color:#111827;padding:8px 12px;border-radius:10px;cursor:pointer;font-weight:600;font-size:13px}
    .btn:hover{border-color:#cbd5e1;background:#fafafa}
    .btn.primary{background:linear-gradient(180deg,#3b82f6,#2563eb);border-color:#1d4ed8;color:#fff}

    .stage{position:relative;background:#000}
    .stage iframe,.stage video{width:100%;height:min(69vh,720px);display:block}

    .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}
    .tile{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:12px;display:flex;gap:10px;align-items:center}
    .tile img{width:48px;height:48px;border-radius:10px;border:1px solid #e5e7eb}
    .tile .name{font-size:13px;font-weight:600}
    .tile .desc{font-size:12px;color:var(--muted)}

    @media (max-width:1080px){
      .page{grid-template-columns:1fr}
      .sidebar{position:static;height:auto}
      .grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .grid{grid-template-columns:1fr}
    }