:root{--bg:#fbfbfc;--card:#fff;--muted:#505050;--accent:#0e76bd}
    *{box-sizing:border-box}
    body{font-family:Inter,system-ui,Arial;margin:0;background:var(--bg);color:#111;padding:18px}
    header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
    h1{font-size:18px;margin:0}
    .controls{display:flex;gap:8px;align-items:center}
    .btn{padding:8px 12px;border-radius:10px;border:0;background:#fff;box-shadow:0 6px 15px rgba(0,0,0,0.06);cursor:pointer;font-size:13px}
    .btn.primary{background:var(--accent);color:#fff}
    .container{display:flex;flex-direction:column;gap:12px;align-items:center}
    .sections{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
    .preview{width:80%;max-width:1100px;background:var(--card);border-radius:12px;overflow:hidden;box-shadow:0 18px 36px rgba(0,0,0,0.07);border:1px solid rgba(0,0,0,0.04)}
    .preview iframe{width:100%;height:min(640px,calc(72vh));border:0;display:block}
    .desc{padding:16px 20px;background:linear-gradient(180deg,#fff,#fff);color:var(--muted);font-size:15px;line-height:1.5}
    .desc .title{font-weight:700;color:#141414;margin-bottom:8px}
    .chip{background:#eef6ff;color:var(--accent);padding:6px 10px;border-radius:999px;font-weight:700;font-size:13px}
    .hint{font-size:13px;color:var(--muted);text-align:center;margin-top:6px}
    @media (max-width:900px){.preview{width:96%}.preview iframe{height:min(520px,calc(60vh))}header{flex-direction:column;align-items:flex-start;gap:10px}}