:root {
  --bg: #ffffff;
  --surface: #f5f7f9;
  --text: #1b1f24;
  --muted: #5b6672;
  --border: #d9dee4;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --ok: #1a7f37;
  --err: #c62828;
  --radius: 10px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --surface: #182029;
    --text: #e6edf3;
    --muted: #9aa7b4;
    --border: #2d3742;
    --accent: #4c8dff;
    --accent-text: #0f1419;
    --ok: #3fb950;
    --err: #ff6b6b;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 820px; margin: 0 auto; padding: 0 16px; }
.site-header { border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; font-size: 19px; text-decoration: none; color: var(--text); }
.site-header nav a { margin-left: 16px; text-decoration: none; color: var(--muted); }
.site-footer { border-top: 1px solid var(--border); margin-top: 64px; color: var(--muted); font-size: 15px; }
.site-footer .wrap { padding-top: 16px; padding-bottom: 32px; }
h1 { font-size: 34px; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 24px; margin: 40px 0 8px; }
h3 { font-size: 19px; margin: 24px 0 4px; }
.lead { font-size: 19px; color: var(--muted); margin-top: 0; }
.breadcrumbs { font-size: 14px; color: var(--muted); margin-top: 16px; }
.breadcrumbs a { color: var(--muted); }

/* Converter tool */
.tool { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin: 24px 0; }
.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-height: 160px; padding: 24px; text-align: center; cursor: pointer;
  border: 2px dashed var(--border); border-radius: var(--radius); background: var(--bg);
}
.drop span { color: var(--muted); font-size: 15px; }
.drop.dragover { border-color: var(--accent); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.status { min-height: 1.6em; margin: 12px 0 0; }
.status.error { color: var(--err); }
.status.ok { color: var(--ok); }
.panel { margin-top: 12px; }
.map { width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); overflow: hidden; }
.summary { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 12px 0; font-size: 15px; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; overflow-wrap: anywhere; }
.field { margin: 12px 0; }
.field label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.field input { width: 100%; max-width: 360px; padding: 8px 10px; font: inherit; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text); }
.field small { display: block; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; }
.btn {
  display: inline-block; padding: 10px 18px; border: 0; border-radius: 8px; cursor: pointer;
  background: var(--accent); color: var(--accent-text); font: inherit; font-weight: 600; text-decoration: none;
}
.btn[disabled] { opacity: .6; cursor: progress; }
.btn-secondary { background: var(--ok); }

/* Lists of links */
.grid { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.grid a { display: block; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: var(--text); background: var(--surface); }
.grid a span { display: block; color: var(--muted); font-size: 14px; }
.format-card { border-left: 3px solid var(--border); padding-left: 16px; margin: 16px 0; }