:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --text: #e6e8ee;
  --muted: #9aa3b2;
  --accent: #4f9cf9;
  --accent-hover: #6db0ff;
  --ok: #4ade80;
  --warn: #fbbf24;
  --err: #f87171;
  --border: #2a2f3a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.01em;
}

.tag { margin: 0 0 24px; color: var(--muted); }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 16px;
}

/* controls */
.controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

button.primary {
  appearance: none;
  border: none;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
}
button.primary:hover { background: var(--accent-hover); }
button.primary:disabled { opacity: .5; cursor: default; }

.status { color: var(--muted); }
.status.ok    { color: var(--ok); }
.status.warn  { color: var(--warn); }
.status.err   { color: var(--err); }

/* result */
.result { display: flex; flex-direction: column; gap: 14px; }
.result.hidden { display: none; }
.result-row.big {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}
.result-row.big .label { font-size: 13px; color: var(--muted); }
.result-row.big .value { font-size: 40px; font-weight: 700; color: var(--ok); font-variant-numeric: tabular-nums; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
}
@media (max-width: 540px) { .grid { grid-template-columns: 1fr; } }
.cell { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.cell .label { color: var(--muted); font-size: 12px; }
.cell .value { font-variant-numeric: tabular-nums; word-break: break-word; }

/* caveat / notes */
.caveat { border-color: #4a3a1a; }
.caveat h2 { color: var(--warn); }
.caveat code, .notes code, .log-card code, footer code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}
.caveat pre, .log pre {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  overflow-x: auto;
}
.caveat pre { margin: 6px 0; }
ul { margin: 8px 0; padding-left: 20px; }
li { margin-bottom: 4px; color: var(--muted); }

/* log */
.log {
  max-height: 320px;
  overflow: auto;
  margin: 0;
  font: 12px/1.45 "SF Mono", Menlo, Consolas, monospace;
  color: #cdd3df;
  white-space: pre-wrap;
  word-break: break-word;
}
.log .l-err { color: var(--err); }
.log .l-ok  { color: var(--ok); }
.log .l-warn{ color: var(--warn); }
.log .l-dim { color: #6b7382; }

footer { color: var(--muted); font-size: 12px; text-align: center; margin-top: 24px; }