:root {
  color-scheme: light;
  --page: #f9f9f7; --surface: #fcfcfb; --ink: #0b0b0b; --ink-2: #52514e; --muted: #898781;
  --grid: #e1e0d9; --axis: #c3c2b7; --ring: rgba(11,11,11,0.10);
  --accent: #2a78d6; --accent-ink: #fff; --warn-bg: #fdf3e7; --warn-ink: #8a4b0f;
  --err-bg: #fdecea; --err-ink: #a12a1d;
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10);
    --accent: #3987e5; --warn-bg: #2b2013; --warn-ink: #e8b370; --err-bg: #301816; --err-ink: #f0a49b;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--page); color: var(--ink); font: 14px/1.5 var(--font); }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 22px; margin: 0 0 4px; font-weight: 600; }
h2 { font-size: 15px; margin: 0 0 8px; font-weight: 600; }
.sub { color: var(--ink-2); margin: 0 0 20px; }
.card { background: var(--surface); border: 1px solid var(--ring); border-radius: 10px; padding: 14px 16px; margin-bottom: 16px; }
.modes { display: flex; flex-wrap: wrap; gap: 8px; }
.modes label { flex: 1 1 260px; display: flex; gap: 8px; align-items: flex-start; padding: 10px 12px; cursor: pointer;
  border: 1px solid var(--axis); border-radius: 8px; }
.modes label:has(input:checked) { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.modes small { display: block; color: var(--ink-2); }
.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }
.field > label, .field > .lab { display: block; font-weight: 600; margin-bottom: 2px; }
.hint { color: var(--ink-2); font-size: 12px; margin: 0 0 6px; }
textarea, input[type=number], input[type=file] {
  font: inherit; color: var(--ink); background: var(--page); border: 1px solid var(--axis); border-radius: 6px;
  padding: 6px 8px; max-width: 100%;
}
textarea { width: 100%; min-height: 110px; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; }
input[type=number] { width: 90px; }
.row { display: flex; flex-wrap: wrap; gap: 8px 24px; }
details summary { cursor: pointer; font-weight: 600; }
details .field { margin-top: 12px; }
button, .btn { font: inherit; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 6px;
  padding: 8px 16px; cursor: pointer; text-decoration: none; display: inline-block; }
.btn.alt { background: var(--surface); color: var(--ink); border: 1px solid var(--axis); }
.msg { border-radius: 8px; padding: 10px 12px; margin-bottom: 16px; }
.msg.err { background: var(--err-bg); color: var(--err-ink); }
.msg.warn { background: var(--warn-bg); color: var(--warn-ink); }
.msg ul { margin: 0; padding-left: 18px; }
.bar { height: 8px; background: var(--grid); border-radius: 4px; overflow: hidden; margin: 10px 0 6px; }
.bar > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .4s; }
.btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 2px 16px; margin: 0; }
dt { color: var(--ink-2); }
dd { margin: 0; font-variant-numeric: tabular-nums; }
.foot { color: var(--muted); font-size: 12px; }