:root {
  --bg: #0b0e17;
  --card: #141a28;
  --line: #222b40;
  --text: #e8eaf0;
  --muted: #7c85a0;
  --accent: #4ade80;
  --bad: #f87171;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 26px; margin: 0 0 8px; }
h2 { font-size: 15px; margin: 0 0 14px; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.lede { color: var(--muted); margin: 0 0 28px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin-bottom: 18px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row label { min-width: 84px; color: var(--muted); }
.row input { flex: 1 1 260px; }
.grid { display: grid; grid-template-columns: 130px 1fr; gap: 10px 14px; align-items: center; }
.grid label { color: var(--muted); }
input {
  background: #0d1220; border: 1px solid var(--line); border-radius: 8px;
  color: var(--text); padding: 9px 11px; font: 13px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  width: 100%; min-width: 0;
}
input:focus { outline: none; border-color: #3b4a6b; }
button {
  background: #1d2740; border: 1px solid var(--line); border-radius: 8px;
  color: var(--text); padding: 9px 16px; font: 600 13px/1 system-ui, sans-serif; cursor: pointer;
}
button:hover { background: #24304e; }
button.primary { background: var(--accent); color: #06210f; border-color: transparent; margin-top: 16px; }
button.primary:hover { filter: brightness(1.08); }
.status { color: var(--muted); font-size: 13px; min-height: 1.2em; margin: 12px 0 0; }
.status.bad { color: var(--bad); }
dl { display: grid; grid-template-columns: 200px 1fr; gap: 10px 14px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; word-break: break-all; }
.ok { color: var(--accent); font-weight: 600; }
.bad { color: var(--bad); font-weight: 600; }
ol { margin: 0; padding-left: 20px; color: var(--muted); }
ol li { margin-bottom: 7px; }
code { background: #0d1220; padding: 1px 5px; border-radius: 4px; font-size: 13px; color: var(--text); }
@media (max-width: 560px) {
  .grid, dl { grid-template-columns: 1fr; }
}

.board { display: grid; grid-template-columns: repeat(5, 34px); gap: 4px; margin: 8px 0; }
.board div { width: 34px; height: 34px; border-radius: 5px; background: #2a2f3a; }
.board div.mine { background: #b3261e; }
.board div.safe { background: #1f8a4c; }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; }
.swatch.mine { background: #b3261e; }
.swatch.safe { background: #1f8a4c; }
.legend { font-size: 12px; opacity: 0.75; }