html, body { margin: 0; height: 100%; overflow: hidden; font: 15px/1.5 -apple-system, system-ui, sans-serif; color: #1d1f23; background: #f4f5f7; }
  .shell { display: grid; grid-template-columns: 220px 1fr; height: 100%; }
  aside { background: #16181d; color: #c9ccd3; padding: 20px 16px; }
  aside h2 { color: #fff; font-size: 16px; margin: 0 0 16px; }
  aside a { display: block; color: inherit; text-decoration: none; padding: 6px 10px; border-radius: 6px; }
  aside a.on { background: #2a2d35; color: #fff; }
  main { overflow-y: auto; }
  header { position: sticky; top: 0; background: rgba(255,255,255,.9); border-bottom: 1px solid #e3e5e9; padding: 14px 28px; display: flex; gap: 12px; align-items: center; z-index: 2; }
  header input { flex: 1; max-width: 320px; padding: 8px 12px; border: 1px solid #d5d8de; border-radius: 8px; font: inherit; }
  header button { padding: 8px 14px; border: 0; border-radius: 8px; background: #3d5afe; color: #fff; font: 600 14px system-ui; }
  .wrap { padding: 28px; max-width: 920px; }
  h1 { font-size: 40px; letter-spacing: -.02em; margin: 0 0 12px; }
  .lead { color: #5b616e; font-size: 18px; }
  figure { float: right; width: 260px; margin: 0 0 12px 20px; background: #fff; border: 1px solid #e3e5e9; border-radius: 10px; padding: 8px; }
  figure .ph { height: 150px; border-radius: 6px; background: linear-gradient(135deg,#7f5af0,#2cb67d); }
  figcaption { font-size: 13px; color: #6b7280; padding-top: 6px; }
  .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; clear: both; margin: 24px 0; }
  .card { background: #fff; border: 1px solid #e3e5e9; border-radius: 12px; padding: 18px; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
  .card h3 { margin: 0 0 6px; font-size: 17px; }
  .card p { margin: 0; color: #5b616e; font-size: 14px; }
  .tag { display: inline-block; font: 600 11px/1 system-ui; padding: 4px 8px; border-radius: 999px; background: #eef1ff; color: #3d5afe; margin-bottom: 10px; }
  .sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  form { background: #fff; border: 1px solid #e3e5e9; border-radius: 12px; padding: 18px; display: grid; gap: 10px; max-width: 420px; }
  label { display: flex; gap: 8px; align-items: center; }
  textarea, select { font: inherit; padding: 8px; border: 1px solid #d5d8de; border-radius: 8px; }
  .media { display: flex; gap: 16px; margin: 24px 0 400px; }
  video, iframe { width: 300px; height: 170px; border-radius: 10px; border: 0; background: #000; }
  .icon { width: 14px; height: 14px; display: inline-block; background: #3d5afe; -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'><circle cx='5' cy='5' r='5'/></svg>") center/contain no-repeat; vertical-align: -2px; }