:root {
  --bg: #eef1f6;
  --ink: #14213d;
  --muted: #4a5878;
  --card: #ffffff;
  --brand: #ffc72c;
  --blue: #1d4ed8;
  --ok: #15803d;
  --ok-bg: #dcfce7;
  --fail: #b91c1c;
  --fail-bg: #fee2e2;
  --warn: #9a3412;
  --warn-bg: #ffedd5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1224;
    --ink: #e7ecf7;
    --muted: #9fb0d0;
    --card: #141d36;
    --blue: #3b82f6;
    --ok: #4ade80;
    --ok-bg: #12311f;
    --fail: #f87171;
    --fail-bg: #3a1414;
    --warn: #fdba74;
    --warn-bg: #3a2210;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
.hero {
  background: var(--blue);
  color: #fff;
  padding: 28px 16px 24px;
  border-bottom: 6px solid var(--brand);
}
.hero h1 { margin: 4px 0; font-size: 1.6rem; }
.hero p { margin: 0; opacity: .9; }
.tag { font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; }
main { max-width: 640px; margin: 0 auto; padding: 16px; display: grid; gap: 12px; }
.card { background: var(--card); border-radius: 14px; padding: 16px; }
.card h2 { margin: 0 0 4px; font-size: 1.1rem; display: flex; gap: 8px; align-items: center; }
.card > p { margin: 0 0 12px; color: var(--muted); }
.n {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--blue); color: #fff; font-size: .85rem;
}
.row { display: flex; flex-wrap: wrap; gap: 8px; }
button {
  font: inherit; border: 0; border-radius: 10px; padding: 10px 14px;
  background: var(--blue); color: #fff; cursor: pointer;
}
button.ghost { background: transparent; color: var(--blue); box-shadow: inset 0 0 0 2px var(--blue); }
button.danger { background: var(--fail); }
button:disabled { opacity: .5; }
label { display: grid; gap: 4px; margin-top: 10px; font-size: .9rem; color: var(--muted); }
select, textarea {
  font: inherit; width: 100%; padding: 8px; border-radius: 8px;
  border: 1px solid var(--muted); background: var(--bg); color: var(--ink);
}
textarea { font-family: ui-monospace, Consolas, monospace; font-size: .8rem; }
.result { margin: 12px 0 0; padding: 0; border-radius: 8px; font-size: .9rem; }
.result:empty { display: none; }
.result.ok { background: var(--ok-bg); color: var(--ok); padding: 8px 10px; }
.result.fail { background: var(--fail-bg); color: var(--fail); padding: 8px 10px; }
.result.warn { background: var(--warn-bg); color: var(--warn); padding: 8px 10px; }
.digest {
  font: 700 2rem ui-monospace, Consolas, monospace; letter-spacing: .1em;
  margin: 12px 0 0; text-align: center;
}
dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin: 8px 0 0; font-size: .85rem; }
dt { color: var(--muted); }
dd { margin: 0; word-break: break-word; }