:root {
  --bg: #f6f7f9;
  --card: #fff;
  --ink: #1a1d24;
  --muted: #5c6570;
  --accent: #0b6bcb;
  --border: #d8dee6;
  --danger: #b42318;
  --ok: #067647;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
}
.wrap { max-width: 880px; margin: 0 auto; padding: 1.5rem; }
header h1 { margin: 0 0 .4rem; font-size: 1.6rem; }
.badge {
  display: inline-block; font-size: .7rem; vertical-align: middle;
  background: #fff4ce; color: #854d0e; border: 1px solid #f5d565;
  border-radius: 999px; padding: .1rem .5rem; margin-left: .35rem;
}
.lead, .hint { color: var(--muted); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.1rem 1.2rem; margin: 1rem 0;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}
#dropzone.drag { border-color: var(--accent); background: #eef6ff; }
.drop-line { margin: 0 0 .9rem; }
#dropzone .controls {
  display: flex; flex-wrap: wrap; gap: .75rem; align-items: center;
  padding-top: .9rem; border-top: 1px solid var(--border);
}
.controls { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
button {
  appearance: none; border: 1px solid var(--border); background: #fff;
  border-radius: 8px; padding: .55rem 1rem; cursor: pointer; font-weight: 600;
}
button:disabled { opacity: .45; cursor: not-allowed; }
#convert { background: var(--accent); color: #fff; border-color: var(--accent); }
.linkish {
  display: inline; border: none; background: none; color: var(--accent);
  padding: 0; font: inherit; font-weight: 600; text-decoration: underline; cursor: pointer;
}
.status { font-size: .92rem; }
.status.err { color: var(--danger); }
.status.ok { color: var(--ok); }
#preview { width: 100%; height: 70vh; border: 1px solid var(--border); border-radius: 8px; }