:root {
  --bg: #f7f7f5;
  --fg: #1d1d1b;
  --muted: #5f5f5a;
  --card: #ffffff;
  --line: #d9d9d4;
  --accent: #2456c7;
  --ok: #1f7a3a;
  --warn: #9a6200;
  --bad: #b3261e;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #ececea;
    --muted: #a5a59f;
    --card: #1f1f1e;
    --line: #3a3a37;
    --accent: #7ea2ff;
    --ok: #5fcf7f;
    --warn: #f0b44c;
    --bad: #ff8a80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.5rem; margin: 0 0 16px; }
h2 { font-size: 1.15rem; margin: 24px 0 8px; }
p, ul { margin: 0 0 12px; }
.rules { padding-left: 20px; color: var(--muted); }
.note, .stat, .opt { color: var(--muted); }
.opt { font-size: .875rem; }
form, #result { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
label { display: block; margin: 0 0 14px; }
input:not([type]), select, textarea {
  display: block; width: 100%; margin-top: 4px; padding: 8px 10px;
  font: inherit; color: var(--fg); background: var(--bg);
  border: 1px solid var(--line); border-radius: 6px;
}
textarea { font: 12px/1.4 ui-monospace, Menlo, Consolas, monospace; }
.check input { margin-right: 6px; }
button {
  font: inherit; font-weight: 600; padding: 10px 18px; margin: 4px 0;
  color: #fff; background: var(--accent); border: 0; border-radius: 6px; cursor: pointer;
}
button.secondary { color: var(--fg); background: transparent; border: 1px solid var(--line); }
button:disabled { opacity: .5; cursor: default; }
progress { width: 100%; height: 14px; accent-color: var(--accent); }
.file { margin: 0 0 12px; }
.file .stat { margin: 2px 0 0; font-size: .9rem; }
#verdict.ok { color: var(--ok); }
#verdict.warn { color: var(--warn); }
#verdict.fail, .bad { color: var(--bad); }
#details { padding-left: 20px; }
details { margin-top: 12px; }
summary { cursor: pointer; color: var(--muted); }