:root {
  --bg: #06080d;
  --panel: #0c111b;
  --panel-2: #111827;
  --line: #1a2334;
  --line-2: #273450;
  --text: #e8edf6;
  --muted: #8a97b0;
  --light: #ffcf6e;
  --light-soft: rgba(255, 207, 110, 0.14);
  --cool: #6fd3ff;
  --hit: #ff5d6c;
  --ref: #ffb347;
  --good: #5fe39a;
  --radius: 14px;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background:
    radial-gradient(900px 520px at 20% -10%, rgba(255, 207, 110, 0.06), transparent 60%),
    radial-gradient(900px 520px at 110% 110%, rgba(111, 211, 255, 0.05), transparent 60%),
    var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
[hidden] { display: none !important; }

.app { max-width: 1180px; margin: 0 auto; padding: 20px 16px 32px; display: flex; flex-direction: column; gap: 16px; }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 14px; }
.mark {
  width: 38px; height: 38px; border-radius: 10px; position: relative; flex: none;
  background: #000; border: 1px solid var(--line-2); overflow: hidden;
  box-shadow: 0 0 24px rgba(255, 207, 110, 0.18);
}
.mark::before {
  content: ""; position: absolute; left: 12px; top: 12px; width: 12px; height: 12px; border-radius: 50%;
  background: radial-gradient(circle, #fff 0 25%, var(--light) 45%, transparent 72%);
}
.mark::after {
  content: ""; position: absolute; left: -4px; top: 17px; width: 18px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--light));
}
h1 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.hud { display: flex; gap: 6px; flex-wrap: wrap; }
.stat {
  display: flex; flex-direction: column; gap: 1px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 6px 12px; min-width: 76px;
}
.label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.val { font-size: 15px; font-weight: 600; font-variant-numeric: tabular-nums; }

/* layout */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 16px; align-items: start; }
.stage { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.board-wrap {
  position: relative; width: 100%; max-width: 720px; margin: 0 auto;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line-2);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  background: var(--bg);
}
canvas { display: block; width: 100%; height: 100%; touch-action: manipulation; cursor: pointer; }
canvas:focus { outline: none; }
canvas:focus-visible, .btn:focus-visible, .tier:focus-visible, .seg:focus-visible, input:focus-visible, .log__item:focus-visible {
  outline: 2px solid var(--light); outline-offset: 2px;
}

.overlay {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  padding: 16px; background: rgba(6, 8, 13, 0.78); backdrop-filter: blur(4px); overflow-y: auto; z-index: 2;
}
.overlay--soft { background: rgba(6, 8, 13, 0.55); }
.card {
  width: min(560px, 100%); margin: auto;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 22px 22px 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.kicker { margin: 0; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--light); }
.card h2, .result h2 { margin: 4px 0 8px; font-size: 26px; letter-spacing: -0.02em; }
.lede { margin: 0 0 16px; color: var(--muted); font-size: 14px; }
.code-tag { text-transform: none; letter-spacing: 0.02em; color: var(--text); }
.note { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.tiers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-bottom: 12px; }
.tier {
  display: flex; flex-direction: column; align-items: flex-start; gap: 2px; text-align: left;
  background: var(--panel); color: var(--text); font: inherit;
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; cursor: pointer; min-width: 0;
  transition: border-color 0.15s, transform 0.15s;
}
.tier:hover { border-color: var(--line-2); transform: translateY(-1px); }
.tier[aria-checked="true"] { border-color: var(--light); box-shadow: inset 0 0 0 1px var(--light); }
.tier__name { font-weight: 650; font-size: 15px; }
.tier__blurb { font-size: 12.5px; color: var(--muted); }
.tier__best { font: 600 11px var(--mono); color: var(--cool); }

.mode { display: inline-flex; border: 1px solid var(--line-2); border-radius: 10px; padding: 3px; gap: 3px; background: var(--panel); }
.seg {
  border: 0; background: transparent; color: var(--muted); font: 600 13px var(--sans);
  padding: 7px 14px; border-radius: 7px; cursor: pointer;
}
.seg[aria-checked="true"] { background: var(--panel-2); color: var(--text); box-shadow: inset 0 0 0 1px var(--line-2); }

.code { margin-top: 12px; }
.code label { display: block; font-size: 13px; margin-bottom: 4px; }
.code input {
  width: 100%; background: #05070b; color: var(--text); border: 1px solid var(--line-2);
  border-radius: 8px; padding: 8px 10px; font-size: 14px;
}
.code input[aria-invalid="true"] { border-color: var(--hit); }
.field-err { margin: 4px 0 0; color: var(--hit); font-size: 12.5px; min-height: 1em; }

.row { display: flex; gap: 8px; flex-wrap: wrap; }
.card .row { margin-top: 16px; }
.btn {
  border: 1px solid var(--line-2); background: var(--panel-2); color: var(--text);
  font: 600 14px var(--sans); padding: 9px 16px; border-radius: 10px; cursor: pointer;
  transition: border-color 0.15s, background 0.15s, opacity 0.15s;
}
.btn:hover:not(:disabled) { border-color: var(--light); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.primary { background: var(--light); color: #1d1405; border-color: var(--light); }
.btn.primary:hover:not(:disabled) { background: #ffdc95; }
.btn.small { font-size: 12.5px; padding: 6px 10px; }
.btn.grow { flex: 1 1 auto; }
kbd { font: 600 10.5px var(--mono); color: var(--muted); border: 1px solid var(--line-2); border-radius: 4px; padding: 0 4px; margin-left: 4px; }
.btn.primary kbd { color: #5a4310; border-color: rgba(0, 0, 0, 0.2); }

.building {
  display: flex; align-items: center; gap: 10px; background: var(--panel-2); border: 1px solid var(--line-2);
  border-radius: 999px; padding: 10px 18px; font-size: 14px;
}
.spinner {
  width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--line-2); border-top-color: var(--light);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: absolute; left: 50%; top: 12px; transform: translate(-50%, -8px); z-index: 3;
  background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 999px;
  padding: 5px 14px; font: 600 12px var(--mono); color: var(--text); white-space: nowrap;
  opacity: 0; pointer-events: none; transition: opacity 0.18s, transform 0.18s;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; max-width: 720px; width: 100%; margin: 0 auto; }
.hint { margin: 0; color: var(--muted); font-size: 13.5px; min-height: 1.5em; flex: 1 1 260px; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* side */
.side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.worlds__head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.worlds__status { font-size: 11px; color: var(--light); }
.worlds__num { font-size: 34px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; margin-top: 4px; font-variant-numeric: tabular-nums; }
.worlds__num.is-one { color: var(--good); }
.worlds__num.is-stale { opacity: 0.45; }
.worlds__of { margin: 6px 0 12px; font-size: 12.5px; color: var(--muted); }
.meter { height: 6px; border-radius: 4px; background: #05070b; border: 1px solid var(--line); overflow: hidden; }
.meter span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--cool), var(--light)); transition: width 0.35s ease; }

.toggle { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; font-size: 13.5px; }
.toggle input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.toggle__ui {
  flex: none; width: 34px; height: 20px; border-radius: 999px; background: #05070b; border: 1px solid var(--line-2);
  position: relative; margin-top: 1px; transition: background 0.15s, border-color 0.15s;
}
.toggle__ui::after {
  content: ""; position: absolute; left: 2px; top: 2px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--muted); transition: transform 0.15s, background 0.15s;
}
.toggle input:checked + .toggle__ui { background: var(--light-soft); border-color: var(--light); }
.toggle input:checked + .toggle__ui::after { transform: translateX(14px); background: var(--light); }
.toggle input:focus-visible + .toggle__ui { outline: 2px solid var(--light); outline-offset: 2px; }
.toggle .muted { font-size: 12.5px; }

.submit-note { margin: 8px 0 0; font-size: 12.5px; color: var(--muted); min-height: 1.2em; }

.result { border-color: var(--line-2); background: linear-gradient(180deg, var(--panel-2), var(--panel)); }
.tally {
  display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; margin: 8px 0 0; padding: 12px 14px;
  background: rgba(0, 0, 0, 0.25); border: 1px solid var(--line); border-radius: 10px;
}
.tally dt { color: var(--muted); font-size: 13px; }
.tally dd { margin: 0; text-align: right; font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.tally .sum { border-top: 1px solid var(--line-2); padding-top: 6px; color: var(--text); font-weight: 700; }
.result .row { margin-top: 14px; }

.log__head { display: flex; justify-content: space-between; margin-bottom: 6px; }
.log__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; max-height: 300px; overflow-y: auto; }
.log__item {
  display: grid; grid-template-columns: 28px 1fr auto; gap: 8px; align-items: center;
  font-size: 13px; padding: 4px 6px; border-radius: 6px; cursor: default;
}
.log__item:hover, .log__item.is-hot { background: var(--panel-2); }
.log__tag {
  font: 700 11px var(--mono); width: 24px; height: 20px; border-radius: 5px; display: grid; place-items: center;
  color: #0b0d12;
}
.log__fit { font: 600 12px var(--mono); }
.log__fit.yes { color: var(--good); }
.log__fit.no { color: var(--hit); }
.log__fit.na { color: var(--muted); }
.log__empty { margin: 0; color: var(--muted); font-size: 13px; }

/* legend */
.legend {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px 18px;
  padding: 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  color: var(--muted); font-size: 13px;
}
.legend div { display: flex; align-items: flex-start; gap: 10px; }
.legend b { color: var(--text); font-weight: 600; }
.sw { width: 22px; height: 22px; flex: none; border-radius: 5px; display: grid; place-items: center; font: 700 11px var(--mono); font-style: normal; color: #0b0d12; }
.sw-hit { background: var(--hit); }
.sw-ref { background: var(--ref); }
.sw-det { background: var(--cool); }
.sw-atom { border-radius: 50%; background: radial-gradient(circle, #fff 0 18%, var(--light) 40%, rgba(255, 207, 110, 0.15) 70%); }
.sw-edge { background: linear-gradient(90deg, var(--line-2) 50%, transparent 50%); border: 1px dashed var(--line-2); }

@media (max-width: 960px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .hud { width: 100%; }
  .stat { flex: 1 1 0; min-width: 0; padding: 5px 8px; }
  .card { padding: 16px; }
  .card h2 { font-size: 22px; }
  .tiers { grid-template-columns: minmax(0, 1fr); }
  .overlay { position: fixed; z-index: 10; align-items: flex-start; }
  .worlds__num { font-size: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}