:root {
  --bg: #f6f5f1; --card: #fbfaf7; --ink: #1c1b19; --muted: #6b6862; --faint: #a8a49c;
  --line: #e3e0d8; --track: #e9e6df;
  --serif: 'Instrument Serif', Georgia, serif;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121211; --card: #181817; --ink: #ecebe7; --muted: #9c9a94; --faint: #5f5d58;
          --line: #2a2926; --track: #262522; color-scheme: dark; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
.page { max-width: 860px; margin: 0 auto; padding: 56px 20px 24px; }
a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--faint); }
a:hover { border-color: var(--ink); }
[hidden] { display: none !important; }

.eyebrow, .label { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.num { font-family: var(--mono); font-size: 12px; color: var(--muted); }

.hero { padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.hero h1 { font-family: var(--serif); font-weight: 400; font-size: clamp(40px, 7vw, 56px); line-height: 1.02;
  letter-spacing: -0.01em; margin: 14px 0; }
.hero p { color: var(--muted); max-width: 620px; font-size: 15px; line-height: 1.6; margin: 0; }
.hero em { font-family: var(--serif); font-size: 17px; color: var(--ink); }
.hero nav { margin-top: 18px; display: flex; gap: 22px; font-size: 13px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin: 18px 0 22px; }
.tab { font-family: var(--mono); font-size: 12px; letter-spacing: .04em; color: var(--muted); background: none; border: none;
  padding: 10px 12px; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tab:hover { color: var(--ink); }
.tab.active { color: var(--ink); border-bottom-color: var(--ink); }

textarea { width: 100%; resize: vertical; font: 15px/1.55 var(--sans); color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; outline: none; }
textarea:focus { border-color: var(--ink); }
textarea::placeholder { color: var(--faint); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 18px; }
.chip { font: 12px var(--mono); color: var(--muted); background: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 14px; cursor: pointer; }
.chip:hover { color: var(--ink); border-color: var(--ink); }

.controls { display: flex; gap: 20px; align-items: flex-end; }
.slider { flex: 1; display: flex; flex-direction: column; gap: 10px; }
.slider-row { display: flex; align-items: center; gap: 14px; }
.slider output { min-width: 34px; text-align: right; color: var(--ink); }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 2px; background: var(--line); border-radius: 2px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--card); border: 1.5px solid var(--ink); cursor: pointer; }
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--card); border: 1.5px solid var(--ink); cursor: pointer; }
.primary { font: 500 14px var(--sans); letter-spacing: .02em; color: var(--bg); background: var(--ink); border: 1px solid var(--ink);
  border-radius: 6px; height: 44px; padding: 0 34px; cursor: pointer; }
.primary:hover { opacity: .88; }
.primary:disabled { opacity: .5; cursor: progress; }

.status { min-height: 18px; margin: 14px 0 6px; color: var(--faint); }
.placeholder { color: var(--faint); font-size: 14px; padding: 26px; border: 1px dashed var(--line); border-radius: 6px; text-align: center; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 24px 26px; }
.verdict { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin: 6px 0 18px; }
.verdict .model { font-family: var(--serif); font-size: 38px; line-height: 1; }

.gearbox { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); margin: 8px 0 18px; }
.gearbox .track { position: absolute; left: 12.5%; right: 12.5%; top: 6px; height: 1px; background: var(--line); }
.stop { display: flex; flex-direction: column; align-items: center; gap: 8px; position: relative; }
.knob { width: 13px; height: 13px; border-radius: 50%; border: 1px solid var(--faint); background: var(--card); transition: all .25s ease; }
.shifter { position: absolute; top: 0; left: calc((var(--pos, 0) + .5) * 25% - 6.5px); width: 13px; height: 13px; border-radius: 50%;
  background: var(--ink); box-shadow: 0 0 0 4px var(--card), 0 0 0 5px var(--ink); z-index: 1;
  transition: left .55s cubic-bezier(.3, .8, .25, 1); }
.gear { font: 12px var(--mono); color: var(--faint); }
.stop.on .gear { color: var(--ink); font-weight: 600; }

.reason { color: var(--muted); font-size: 14px; line-height: 1.6; margin: 0 0 18px; }
.note { font-size: 13px; border-left: 2px solid var(--ink); padding-left: 10px; margin: -6px 0 18px; }

.qtable { border-top: 1px solid var(--line); }
.qrow { display: grid; grid-template-columns: 48px 1fr 52px 52px 56px; gap: 14px; align-items: center; padding: 9px 0; border-bottom: 1px solid var(--line); }
.qhead span { font: 10px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--faint); }
.qname { font: 12px var(--mono); color: var(--muted); }
.qrow .num, .qhead .r { text-align: right; }
.qrow.chosen .qname, .qrow.chosen .num { color: var(--ink); font-weight: 600; }
.bar { position: relative; height: 3px; background: var(--track); border-radius: 2px; }
.tick { position: absolute; top: -4px; width: 1px; height: 11px; background: var(--ink); opacity: .55; }
.fill { display: block; height: 100%; border-radius: 2px; background: var(--faint); }
.qrow.chosen .fill { background: var(--ink); }
.meta { margin-top: 16px; font: 11px var(--mono); color: var(--faint); }

.replay-controls { margin-bottom: 22px; }
.select { flex: 3; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
select { width: 100%; font: 14px var(--sans); color: var(--ink); background: var(--card); border: 1px solid var(--line);
  border-radius: 6px; padding: 11px 12px; outline: none; text-overflow: ellipsis; }
select:focus { border-color: var(--ink); }
.prompt { font-family: var(--serif); font-size: 21px; line-height: 1.4; margin: 12px 0 16px; padding-left: 16px;
  border-left: 1px solid var(--ink); white-space: pre-wrap; }
.reference { font-size: 13px; color: var(--muted); margin-bottom: 22px; white-space: pre-wrap; }
.outcome { margin: 16px 0 0; }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stat { border-top: 1px solid var(--line); padding-top: 10px; }
.statline { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-top: 6px; }
.statline .model { font-family: var(--serif); font-size: 26px; }

.answers-title { margin: 34px 0 12px; }
.ans { border-top: 1px solid var(--line); padding: 0 0 4px; }
.ans:last-child { border-bottom: 1px solid var(--line); }
.ans.chosen { border-left: 2px solid var(--ink); padding-left: 18px; margin-left: -20px; }
.ans summary { display: flex; align-items: baseline; gap: 12px; padding: 16px 0; cursor: pointer; list-style: none; }
.ans summary::-webkit-details-marker { display: none; }
.ans summary::before { content: '+'; font: 13px var(--mono); color: var(--faint); width: 10px; }
.ans[open] summary::before { content: '−'; }
.ans summary .num { margin-left: auto; text-align: right; }
.ans-body { padding: 0 0 14px 22px; }
.ans-model { font: 600 13px var(--mono); }
.pick { font: 10px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--card); background: var(--ink);
  padding: 2px 7px; border-radius: 3px; }
.ans-body { font-size: 14px; line-height: 1.65; overflow-wrap: anywhere; }
.ans-body p { margin: 0 0 10px; }
.ans-body ul, .ans-body ol { margin: 0 0 10px; padding-left: 20px; }
.ans-body code, .ans-body pre { font: 12px var(--mono); background: var(--track); border-radius: 4px; padding: 1px 4px; }
.ans-body pre { padding: 12px 14px; overflow-x: auto; }
.ans-body pre code { background: none; padding: 0; }
.ans-body h1, .ans-body h2, .ans-body h3, .ans-body h4 { font-size: 14px; margin: 14px 0 6px; }
.ans-body table { border-collapse: collapse; font-size: 13px; }
.ans-body td, .ans-body th { border-bottom: 1px solid var(--line); padding: 4px 10px 4px 0; text-align: left; }

.chart { margin-bottom: 14px; }
.chart img { width: 100%; display: block; }
.chart img.dark-only { display: none; }
@media (prefers-color-scheme: dark) { .chart img.dark-only { display: block; } .chart img.light-only { display: none; } }
.results { width: 100%; border-collapse: collapse; margin: 16px 0 18px; font: 13px var(--mono); }
.results th, .results td { border-bottom: 1px solid var(--line); padding: 10px 0; text-align: right; }
.results th:first-child, .results td:first-child { text-align: left; }
.results th { font-weight: 400; font-size: 10px; letter-spacing: .07em; text-transform: uppercase; color: var(--faint); }

.foot { margin: 40px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); font: 11px var(--mono); color: var(--faint); }
.foot a { font-size: 11px; }

@media (max-width: 640px) {
  .controls { flex-direction: column; align-items: stretch; }
  .primary { width: 100%; }
  .qrow { grid-template-columns: 40px 1fr 44px 44px 48px; gap: 8px; }
  .compare { grid-template-columns: 1fr; }
  .card { padding: 20px; }
}

.answer-note { margin-top: 26px; padding-top: 4px; }
.answer-note .reason { margin: 10px 0 14px; }
.linklike { font: inherit; color: var(--ink); background: none; border: none; border-bottom: 1px solid var(--faint); padding: 0; cursor: pointer; }
.linklike:hover { border-color: var(--ink); }
.cmd { font: 12px/1.7 var(--mono); color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 12px 16px; margin: 0 0 10px; overflow-x: auto; white-space: pre; }
.small { font: 11px var(--mono); color: var(--muted); }

.steps { list-style: none; padding: 0; margin: 30px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
  border-top: 1px solid var(--line); padding-top: 18px; }
.steps li { font-size: 13px; line-height: 1.55; color: var(--muted); }
.steps .num { display: block; font-size: 11px; color: var(--faint); margin-bottom: 6px; }
.steps b { display: block; font-weight: 500; color: var(--ink); margin-bottom: 3px; }
label.label { display: block; margin-bottom: 10px; }
.chips { align-items: center; }
.chips .label { margin-right: 2px; }
.chip-row { display: contents; }
.hint { font-size: 12px; color: var(--faint); }
.fineprint { font-size: 12px; color: var(--faint); margin: 14px 0 0; }
.intro { color: var(--muted); font-size: 14px; line-height: 1.6; margin: 0 0 22px; max-width: 680px; }
.select-row { display: flex; gap: 10px; align-items: center; }
.select-row .chip { padding: 9px 14px; flex: none; }
.gearcaps { display: flex; justify-content: space-between; font: 10px var(--mono); letter-spacing: .05em; color: var(--faint);
  margin: -8px 0 20px; padding: 0 2px; }
.legend { font-size: 12px; line-height: 1.6; color: var(--faint); margin: 12px 0 0; }
.legend b { font-weight: 500; color: var(--muted); }
@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; gap: 12px; margin-top: 24px; }
  .steps li { display: grid; grid-template-columns: 28px 1fr; }
  .steps .num { grid-row: span 2; margin: 1px 0 0; }
}

.download-note { display: flex; gap: 12px; align-items: baseline; max-width: 660px; margin: 24px 0 0;
  font-size: 13px; line-height: 1.55; color: var(--muted); }
.download-note .num { flex: none; font-size: 11px; color: var(--ink); border: 1px solid var(--line); border-radius: 999px; padding: 1px 9px; }