:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1b2733;
  --muted: #5d6b79;
  --line: #d9e0e6;
  --brand: #0b6b63;
  --brand-ink: #ffffff;
  --danger: #b3261e;
  --warn-bg: #fff4d6;
  --warn-ink: #6b4b00;
  --ok-bg: #e3f4ea;
  --ok-ink: #14532d;
  --err-bg: #fde8e7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1418;
    --card: #182027;
    --ink: #e6edf3;
    --muted: #93a1ae;
    --line: #2b3640;
    --brand: #2fb5a9;
    --brand-ink: #04201d;
    --danger: #ff8a80;
    --warn-bg: #3a2f10;
    --warn-ink: #ffd98a;
    --ok-bg: #12301f;
    --ok-ink: #9be3b5;
    --err-bg: #3b1816;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
header.top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
header.top h1 { font-size: 18px; margin: 0; flex: 1; }
header.top button { width: auto; padding: 8px 12px; min-height: 40px; }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 16px; }
h2 { font-size: 18px; font-weight: 600; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 16px 0 6px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
label { display: block; font-size: 14px; color: var(--muted); margin: 10px 0 4px; }
input, select, textarea { width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
textarea { min-height: 84px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: 1px; }
button { font: inherit; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--ink); padding: 10px 14px; cursor: pointer; min-height: 44px; }
button.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); font-weight: 600; }
button.danger { color: var(--danger); border-color: var(--danger); }
button:disabled { opacity: .55; cursor: not-allowed; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row > * { flex: 1 1 160px; }
.row > button { flex: 0 0 auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
@media (max-width: 600px) { .grid2 { grid-template-columns: 1fr; } }
.list { list-style: none; margin: 0; padding: 0; }
.list li { display: flex; justify-content: space-between; gap: 8px; align-items: center; padding: 12px 4px; border-bottom: 1px solid var(--line); cursor: pointer; }
.list li:last-child { border-bottom: none; }
.list li:hover { background: var(--bg); }
.muted { color: var(--muted); font-size: 14px; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 99px; border: 1px solid var(--line); white-space: nowrap; }
.badge.signed { background: var(--ok-bg); color: var(--ok-ink); border-color: transparent; }
.badge.cancelled { background: var(--err-bg); color: var(--danger); border-color: transparent; }
.banner { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; }
.banner.err { background: var(--err-bg); color: var(--danger); }
.banner.ok { background: var(--ok-bg); color: var(--ok-ink); }
.banner.warn { background: var(--warn-bg); color: var(--warn-ink); }
.item { border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-bottom: 12px; background: var(--bg); }
.qr { display: block; margin: 12px auto; width: 200px; height: 200px; background: #fff; padding: 8px; border-radius: 8px; image-rendering: pixelated; }
code.secret { word-break: break-all; user-select: all; }
a.btn { display: inline-block; text-decoration: none; padding: 10px 14px; border-radius: 8px; background: var(--brand); color: var(--brand-ink); font-weight: 600; min-height: 44px; }
.login { max-width: 400px; margin: 8vh auto 0; }
label.check { display: flex; align-items: center; gap: 8px; color: var(--ink); margin-top: 10px; }
label.check input { width: auto; }
label > input, label > select, label > textarea { display: block; margin-top: 4px; }
a { color: var(--brand); }
.row > a.btn { flex: 0 0 auto; color: var(--brand-ink); }
@media (max-width: 600px) {
  header.top h1 { flex: 1 0 100%; }
  header.top button { flex: 1 1 auto; }
  main { padding: 12px; }
}