/* ── Tokens ─────────────────────────────────────────────────────── */
:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --surface-2: #f2f1ed;
  --line: #e2e0da;
  --line-strong: #cfccc3;
  --ink: #1c1b19;
  --ink-2: #56534c;
  --ink-3: #8a867d;
  --accent: #c96442;
  --accent-soft: #f6e9e3;
  --input-c: #6b8fb5;
  --output-c: #c96442;
  --good: #2f7d5c;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgb(28 27 25 / .05), 0 8px 24px -12px rgb(28 27 25 / .12);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
}
/* Dark tokens are declared for all three host states: an explicit dark stamp,
   and the un-stamped default where only the OS preference decides. Components
   below style through the tokens only, never inside a theme block. */
:root[data-theme="dark"] {
  --bg: #131311;
  --surface: #1c1b19;
  --surface-2: #232220;
  --line: #302e2b;
  --line-strong: #423f3a;
  --ink: #f0eee9;
  --ink-2: #b0aca3;
  --ink-3: #7d7a72;
  --accent: #e08160;
  --accent-soft: #2e211b;
  --input-c: #7fa8ce;
  --good: #5fbb8f;
  --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px -12px rgb(0 0 0 / .5);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131311;
    --surface: #1c1b19;
    --surface-2: #232220;
    --line: #302e2b;
    --line-strong: #423f3a;
    --ink: #f0eee9;
    --ink-2: #b0aca3;
    --ink-3: #7d7a72;
    --accent: #e08160;
    --accent-soft: #2e211b;
    --input-c: #7fa8ce;
    --good: #5fbb8f;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px -12px rgb(0 0 0 / .5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
h1, h2 { line-height: 1.2; margin: 0; letter-spacing: -.02em; }
a { color: inherit; }

.shell { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* ── Masthead ───────────────────────────────────────────────────── */
.masthead {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.masthead-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; display: grid; place-items: center;
  background: var(--accent); color: #fff; border-radius: 8px; font-size: 13px;
}
.brand-text { display: flex; flex-direction: column; }
.brand-text strong { font-size: 15px; letter-spacing: -.01em; }
.brand-text small { color: var(--ink-3); font-size: 11.5px; line-height: 1.2; }

/* ── Intro ──────────────────────────────────────────────────────── */
.intro { padding: 52px 0 34px; max-width: 700px; }
.intro h1 { font-size: clamp(30px, 4.4vw, 42px); }
.lede { color: var(--ink-2); font-size: 17px; margin: 14px 0 0; }
.lede strong { color: var(--ink); font-weight: 600; }
.verified {
  margin: 16px 0 0; font-size: 12.5px; color: var(--ink-3);
  font-family: var(--mono);
}

/* ── Layout ─────────────────────────────────────────────────────── */
.workspace {
  display: grid; grid-template-columns: minmax(300px, 360px) 1fr;
  gap: 20px; align-items: start;
}
.results { display: grid; gap: 20px; }
.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.wide-panel { margin-top: 20px; }
.panel-title {
  font-size: 12px; text-transform: uppercase; letter-spacing: .09em;
  color: var(--ink-3); font-weight: 600; margin-bottom: 16px;
}
.panel-title .sub { text-transform: none; letter-spacing: 0; font-weight: 400; opacity: .75; }
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; margin-bottom: 16px;
}
.panel-head .panel-title { margin-bottom: 0; }
.controls { position: sticky; top: 82px; }

/* ── Form controls ──────────────────────────────────────────────── */
.field { margin-bottom: 20px; }
.field > label {
  display: block; font-size: 13px; font-weight: 600;
  margin-bottom: 8px; color: var(--ink-2);
}
.hint {
  display: inline-grid; place-items: center; width: 15px; height: 15px;
  border-radius: 50%; background: var(--surface-2); color: var(--ink-3);
  font-size: 10px; cursor: help; vertical-align: 1px;
}
.slider-row { display: flex; align-items: center; gap: 12px; }
.pill {
  font-family: var(--mono); font-size: 12px; white-space: nowrap;
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 4px 9px; border-radius: 999px; color: var(--ink-2);
  min-width: 92px; text-align: center;
}
.pill.sm { min-width: 52px; float: right; }

input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%;
  height: 4px; border-radius: 2px; background: var(--line-strong);
  outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 17px; height: 17px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--surface);
  box-shadow: 0 1px 4px rgb(0 0 0 / .25); cursor: grab;
}
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%; background: var(--accent);
  border: 2px solid var(--surface); cursor: grab;
}
input[type="range"]:disabled { opacity: .4; cursor: not-allowed; }
input[type="range"].sub-slider { margin: -4px 0 18px 46px; width: calc(100% - 46px); }

select, .number {
  width: 100%; font: inherit; font-size: 14px; color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 9px 11px;
}
select:focus-visible, .number:focus-visible, input[type="range"]:focus-visible,
button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.model-meta {
  margin: 8px 0 0; font-size: 12px; color: var(--ink-3);
  font-family: var(--mono); line-height: 1.5;
}
.model-meta .warn { color: var(--accent); }

.segmented { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: var(--radius-sm); border: 1px solid var(--line); }
.segmented button {
  flex: 1; font: inherit; font-size: 13px; padding: 6px 0; cursor: pointer;
  background: none; border: 0; border-radius: 6px; color: var(--ink-2);
}
.segmented button.on { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: var(--shadow); }

.switch { display: flex; align-items: flex-start; gap: 11px; margin-bottom: 14px; cursor: pointer; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch-track {
  flex: none; width: 35px; height: 20px; border-radius: 999px;
  background: var(--line-strong); position: relative; transition: background .15s; margin-top: 2px;
}
.switch-thumb {
  position: absolute; top: 2px; left: 2px; width: 16px; height: 16px;
  border-radius: 50%; background: #fff; transition: transform .15s;
  box-shadow: 0 1px 3px rgb(0 0 0 / .3);
}
.switch input:checked + .switch-track { background: var(--accent); }
.switch input:checked + .switch-track .switch-thumb { transform: translateX(15px); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--accent); outline-offset: 2px; }
.switch-label { font-size: 13px; font-weight: 600; color: var(--ink-2); }
.switch-label small { display: block; font-weight: 400; font-size: 11.5px; color: var(--ink-3); }

.advanced { border-top: 1px solid var(--line); padding-top: 14px; margin-top: 4px; }
.advanced summary { cursor: pointer; font-size: 12px; font-weight: 600; color: var(--ink-3); text-transform: uppercase; letter-spacing: .09em; }
.advanced[open] summary { margin-bottom: 16px; }
.note { font-size: 12px; color: var(--ink-3); margin: 6px 0 0; }

.ghost-btn {
  font: inherit; font-size: 13px; cursor: pointer; color: var(--ink-2);
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 7px 13px;
}
.ghost-btn:hover { border-color: var(--line-strong); color: var(--ink); }
.ghost-btn.wide { flex: 1; }
.control-actions { display: flex; gap: 8px; margin-top: 18px; }

/* ── Headline ───────────────────────────────────────────────────── */
.headline { padding: 26px 24px; }
.headline-main { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.eyebrow {
  width: 100%; font-size: 12px; font-weight: 600; letter-spacing: .04em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 4px;
}
.big-cost {
  font-size: clamp(38px, 6vw, 54px); font-weight: 650; letter-spacing: -.035em;
  font-variant-numeric: tabular-nums; line-height: 1;
}
.unit { color: var(--ink-3); font-size: 15px; }
.headline-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 14px; margin: 24px 0 0; padding-top: 20px; border-top: 1px solid var(--line);
}
.headline-grid div { margin: 0; }
.headline-grid dt { font-size: 11.5px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }
.headline-grid dd { margin: 3px 0 0; font-size: 19px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 0; }
.badge {
  font-size: 11.5px; padding: 3px 9px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent); font-weight: 600;
}
.badge.neutral { background: var(--surface-2); color: var(--ink-3); }
.badge.good { background: color-mix(in srgb, var(--good) 14%, transparent); color: var(--good); }

/* ── Tokens ─────────────────────────────────────────────────────── */
.token-bar { display: flex; height: 10px; border-radius: 999px; overflow: hidden; background: var(--surface-2); margin-bottom: 18px; }
.token-seg { transition: width .25s ease; }
.token-seg.input { background: var(--input-c); }
.token-seg.output { background: var(--output-c); }
.token-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 0; }
.token-grid div { margin: 0; }
.token-grid dt { font-size: 12px; color: var(--ink-3); display: flex; align-items: center; gap: 6px; }
.token-grid dd { margin: 3px 0 0; font-size: 17px; font-weight: 600; font-variant-numeric: tabular-nums; }
.token-grid dd.muted { font-size: 12px; font-weight: 400; color: var(--ink-3); font-family: var(--mono); }
.dot { width: 8px; height: 8px; border-radius: 2px; display: inline-block; }
.dot.input { background: var(--input-c); }
.dot.output { background: var(--output-c); }

/* ── Human comparison ───────────────────────────────────────────── */
.versus { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 14px; }
.versus-side { display: flex; flex-direction: column; gap: 3px; padding: 14px; background: var(--surface-2); border-radius: var(--radius-sm); }
.versus-side.ai { background: var(--accent-soft); }
.versus-label { font-size: 11.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); }
.versus-cost { font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.versus-side.ai .versus-cost { color: var(--accent); }
.versus-split { font-family: var(--mono); font-size: 12.5px; color: var(--ink-3); text-align: center; }

/* ── Chart ──────────────────────────────────────────────────────── */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font: inherit; font-size: 12.5px; cursor: pointer; padding: 5px 12px;
  border-radius: 999px; border: 1px solid var(--line); background: var(--surface-2);
  color: var(--ink-3); display: inline-flex; align-items: center; gap: 6px;
}
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chip i { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }

.chart { display: grid; gap: 3px; }
.bar-row {
  display: grid; grid-template-columns: 168px 1fr 84px; align-items: center;
  gap: 12px; padding: 4px 8px; border-radius: 7px;
}
.bar-row.is-selected { background: var(--accent-soft); }
.bar-row:hover { background: var(--surface-2); }
.bar-row.is-selected:hover { background: var(--accent-soft); }
.bar-name {
  font-size: 12.5px; white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; display: flex; align-items: center; gap: 7px;
}
.bar-name i { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.bar-track { height: 17px; background: var(--surface-2); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 4px; transition: width .3s ease; min-width: 2px; }
.bar-cost { font-family: var(--mono); font-size: 12px; text-align: right; font-variant-numeric: tabular-nums; }
.bar-row.is-selected .bar-cost { font-weight: 700; color: var(--accent); }

/* ── Tables ─────────────────────────────────────────────────────── */
.table-scroll { overflow-x: auto; margin: 0 -4px; padding: 0 4px; }
.matrix { width: 100%; border-collapse: collapse; font-size: 13px; }
.matrix th, .matrix td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.matrix th {
  font-size: 11px; text-transform: uppercase; letter-spacing: .07em;
  color: var(--ink-3); font-weight: 600; border-bottom-color: var(--line-strong);
}
.matrix td.num, .matrix th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.matrix tbody tr:hover { background: var(--surface-2); }
.matrix tbody tr.is-selected { background: var(--accent-soft); }
.matrix .name { display: flex; align-items: center; gap: 7px; }
.matrix .name i { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.fn-marker { color: var(--accent); font-size: 10px; vertical-align: super; cursor: help; }
.footnotes { margin: 14px 0 0; padding-left: 18px; font-size: 12px; color: var(--ink-3); }
.footnotes li { margin-bottom: 4px; }

.method p { color: var(--ink-2); max-width: 76ch; margin: 0 0 12px; }
.method code { font-family: var(--mono); font-size: 12.5px; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }

/* ── Footer ─────────────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); margin-top: 48px; padding: 26px 0 40px; color: var(--ink-3); font-size: 13px; }
.site-footer p { margin: 0 0 5px; }
.sources a { color: var(--ink-2); }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .workspace { grid-template-columns: 1fr; }
  .controls { position: static; }
  .bar-row { grid-template-columns: 118px 1fr 76px; gap: 8px; }
  .versus { grid-template-columns: 1fr; }
  .versus-split { padding: 4px 0; }
  .token-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}