:root{
  --bg:#0b0d10;
  --panel:#12161c;
  --text:#e7eef7;
  --muted:#a7b3c2;
  --border:#263041;
  --primary:#4da3ff;
  --danger:#ff5d5d;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
}
.wrap{max-width:1100px;margin:0 auto;padding:24px}
.hero h1{margin:0 0 8px 0;font-size:28px}
.tag{margin:0 0 6px 0;color:var(--muted)}
.meta{margin:0;color:var(--muted);font-size:13px}
.panel{margin-top:18px;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:16px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{
  appearance:none;border:1px solid var(--border);background:#0f1319;color:var(--text);
  padding:10px 12px;border-radius:10px;cursor:pointer;font-weight:650;
}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary{border-color:rgba(77,163,255,.4);background:rgba(77,163,255,.12)}
.btn.danger{border-color:rgba(255,93,93,.35);background:rgba(255,93,93,.12)}
.errors{min-height:20px;margin:10px 0;color:var(--danger);white-space:pre-wrap}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:6px}
@media (max-width: 900px){.grid{grid-template-columns:1fr}}
.label{display:block;margin:6px 0;color:var(--muted);font-size:13px}
.ta{
  width:100%;padding:10px 12px;border-radius:12px;border:1px solid var(--border);
  background:#0b0f14;color:var(--text);font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size:13px;line-height:1.4;resize:vertical;
}
.previewWrap{margin-top:12px;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.previewHead{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:#0f1319;border-bottom:1px solid var(--border)}
.previewTitle{margin:0;font-size:14px}
.hint{color:var(--muted);font-size:12px}
.preview{padding:12px;background:#0b0f14}
.preview a{color:var(--primary)}
.preview pre{overflow:auto;padding:10px;border-radius:10px;background:#0f1319;border:1px solid var(--border)}
.preview code{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}
.help{margin-top:12px;border:1px solid var(--border);border-radius:12px;padding:10px 12px;background:#0f1319}
.help summary{cursor:pointer;color:var(--text);font-weight:650}
.helpBody{color:var(--muted);font-size:13px}
.stats{margin:12px 0 0 0;color:var(--muted);font-size:12px;white-space:pre-wrap}