:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0a84ff;
  --ok: #15803d;
  --err: #b91c1c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d12;
    --card: #161a23;
    --text: #f3f4f6;
    --muted: #9ca3af;
    --line: #2a2f3a;
    --accent: #3b9dff;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.card { max-width: 760px; margin: 24px auto; padding: 24px 20px; background: var(--card);
  border: 1px solid var(--line); border-radius: 14px; }
.head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.logo { border-radius: 9px; }
.small { font-size: 14px; }
h1 { font-size: 22px; margin: 0; }
h2 { font-size: 18px; margin: 16px 0 6px; }
.sub, .muted { color: var(--muted); }
.ok { color: var(--ok); }
a { color: var(--accent); }
label { display: block; font-size: 14px; color: var(--muted); margin: 12px 0; }
input[type="text"], input[type="email"] { display: block; width: 100%; margin-top: 4px;
  padding: 10px 12px; font-size: 16px; color: var(--text); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .row { grid-template-columns: 1fr; } }
.check { display: flex; gap: 10px; align-items: flex-start; color: var(--text); }
.check input { margin-top: 5px; }
button { padding: 12px 18px; font-size: 16px; font-weight: 600; color: #fff;
  background: var(--accent); border: 0; border-radius: 10px; cursor: pointer; }
button[disabled] { opacity: .5; cursor: default; }
table.flights { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0 12px; }
.flights th, .flights td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line);
  vertical-align: top; }
.flights th { color: var(--muted); font-weight: 500; font-size: 12px; text-transform: uppercase; }
.flights td.rem { color: var(--muted); max-width: 240px; }
#view-error h2 { color: var(--err); }
.sig { margin: 12px 0; }
.sig-head { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 4px; }
button.link { background: none; color: var(--accent); font-weight: 500; padding: 0; font-size: 14px; }
.check.typed { margin-top: 8px; font-size: 14px; }
#sig-canvas.readonly { cursor: default; }
#sig-canvas { display: block; width: 100%; aspect-ratio: 1 / 0.6; background: var(--bg);
  border: 1px dashed var(--line); border-radius: 10px; touch-action: none; cursor: crosshair; }
tr.expandable { cursor: pointer; }
tr.expandable:hover td { background: color-mix(in srgb, var(--accent) 6%, transparent); }
tr.expandable td.time::after { content: " ▾"; color: var(--muted); font-size: 11px; }
tr.expandable[aria-expanded="true"] td.time::after { content: " ▴"; }
tr.details td { padding: 6px 6px 12px; border-bottom: 1px solid var(--line); }
.chip { display: inline-block; margin: 4px 6px 0 0; padding: 3px 9px; font-size: 13px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 999px; }
.chip .k { color: var(--muted); }