:root {
  --bg: #f6f7f9; --card: #fff; --text: #1d2330; --muted: #667085; --line: #d9dee7;
  --accent: #2f6fed; --accent-text: #fff; --ok: #1a7f4b; --ok-bg: #e4f5ec;
  --bad: #c0392b; --bad-bg: #fdeaea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c; --card: #1d2229; --text: #e8ebf0; --muted: #98a2b3; --line: #343b46;
    --accent: #6b9bff; --accent-text: #0d1117; --ok: #5fd39a; --ok-bg: #173226;
    --bad: #ff8f85; --bad-bg: #3a1d1a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 18px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 960px; margin: 0 auto; padding: 16px; }
h1 { font-size: 28px; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 28px 0 10px; color: var(--muted); font-weight: 600; }
.sub { color: var(--muted); font-size: 15px; margin: 0 0 8px; }

.grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.type { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px; text-align: left; font: inherit; color: inherit; cursor: pointer; }
.type:hover, .type:focus-visible { border-color: var(--accent); outline: none; }
.type small { display: block; color: var(--muted); margin-top: 4px; font-size: 14px; }

button { font: inherit; cursor: pointer; }
.btn { background: var(--accent); color: var(--accent-text); border: 0; border-radius: 10px;
  padding: 12px 22px; font-weight: 600; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn:disabled { opacity: .5; cursor: default; }
.back { background: none; border: 0; color: var(--accent); padding: 4px 0; font-size: 16px; }

.bar { position: sticky; top: 0; z-index: 2; background: var(--bg); padding: 10px 0;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap; border-bottom: 1px solid var(--line); }
.timer { font: 700 34px/1 ui-monospace, "SF Mono", Menlo, monospace; min-width: 5.2ch; }
.progress { color: var(--muted); }
.bar .spacer { flex: 1; }

.rows { display: grid; gap: 8px 28px; margin: 16px 0; grid-template-columns: 1fr 1fr; }
@media (max-width: 640px) { .rows { grid-template-columns: 1fr; } }
.row { display: flex; align-items: center; gap: 10px; background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; }
.row .n { color: var(--muted); width: 2.2ch; text-align: right; flex: none; }
.row .expr { flex: 1; font-size: 22px; white-space: nowrap; overflow-x: auto; }
.row input { width: 8.5ch; font: 600 22px/1.2 ui-monospace, Menlo, monospace; padding: 6px 8px;
  border: 2px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text);
  text-align: right; }
.row input:focus { outline: none; border-color: var(--accent); }
.row.ok { background: var(--ok-bg); border-color: var(--ok); }
.row.bad { background: var(--bad-bg); border-color: var(--bad); }
.row .mark { width: 1.4em; font-weight: 700; flex: none; text-align: center; }
.row.ok .mark { color: var(--ok); } .row.bad .mark { color: var(--bad); }
.row .right { color: var(--bad); font-weight: 700; flex: none; }

.hidden-until-start { filter: blur(9px); pointer-events: none; user-select: none; }
.start { text-align: center; margin: 24px 0; }
.result { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; margin: 16px 0; display: flex; gap: 28px; flex-wrap: wrap; align-items: baseline; }
.result b { font-size: 32px; }
.result .lbl { color: var(--muted); font-size: 14px; display: block; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }
.err { color: var(--bad); }

.btn.big { font-size: 24px; padding: 18px 40px; }
.home .start { margin: 32px 0; }
.hist { border-collapse: collapse; width: 100%; max-width: 420px; background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.hist th, .hist td { padding: 8px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.hist th { color: var(--muted); font-weight: 600; font-size: 14px; }

.row .ptime { color: var(--muted); font-size: 14px; flex: none; min-width: 4.5ch; text-align: right; }
.start .btn + .btn { margin-left: 8px; }
h3 { font-size: 16px; margin: 20px 0 6px; color: var(--muted); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.chart { width: 100%; height: auto; display: block; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .base { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 4 4; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2.5; }
.chart .dot { fill: var(--accent); }
.chart .axis { fill: var(--muted); font-size: 12px; }
.typestat { background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  margin: 6px 0; padding: 0 12px; }
.typestat[open] { padding-bottom: 10px; }
.typestat summary { display: flex; align-items: center; gap: 14px; padding: 10px 0; cursor: pointer;
  flex-wrap: wrap; }
.typestat .tt { flex: 1 1 240px; font-weight: 600; }
.typestat .tm { color: var(--muted); font-size: 15px; }
.spark { flex: none; }
.spark-line { fill: none; stroke: var(--accent); stroke-width: 2; }
.spark-dot { fill: var(--accent); }
.good { color: var(--ok); font-weight: 600; } .slow { color: var(--bad); font-weight: 600; }
.muted { color: var(--muted); }
.blocks { border-collapse: collapse; width: 100%; max-width: 480px; font-size: 15px; }
.blocks th, .blocks td { padding: 4px 10px 4px 0; text-align: left; border-bottom: 1px solid var(--line); }
.blocks th { color: var(--muted); font-weight: 600; font-size: 13px; }