/* Stack Cap Bench — serious mode: functional, elegant, glass, monospace.
   Light by default; dark from the OS or the theme toggle. */
:root {
  color-scheme: light;
  --bg: #f1f1f2;
  --glass-bg: rgba(255, 255, 255, 0.56);
  --glass-bg-strong: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-hi: rgba(255, 255, 255, 0.7);
  --shadow: 0 16px 40px -24px rgba(0, 0, 0, 0.22);
  --ink: #171717;
  --ink-2: #505050;
  --muted: #838383;
  --line: rgba(0, 0, 0, 0.08);
  --chip-on-bg: #171717;
  --chip-on-ink: #f4f4f4;
  --best: rgba(0, 0, 0, 0.05);
  --blob-1: rgba(0, 0, 0, 0.05);
  --blob-2: rgba(255, 255, 255, 0.9);
  --blob-3: rgba(0, 0, 0, 0.035);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  /* stack hues: OKLCH lightness and chroma (validated on #f3f3f4) */
  --chart-stack-l: 0.62; --chart-stack-c: 0.14;
  --chart-ink: #171717; --chart-ink-2: #5e5e5e; --chart-grid: rgba(0, 0, 0, 0.06);
  --chart-base: rgba(0, 0, 0, 0.3); --chart-hot: #171717; --chart-mark: #171717;
  --chart-frame: transparent;
  --chart-label-font: "JetBrains Mono", monospace; --chart-num-font: "JetBrains Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121213;
    --glass-bg: rgba(30, 30, 31, 0.55);
    --glass-bg-strong: rgba(30, 30, 31, 0.92);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-hi: rgba(255, 255, 255, 0.05);
    --shadow: 0 16px 40px -24px rgba(0, 0, 0, 0.7);
    --ink: #e8e8e8;
    --ink-2: #a9a9a9;
    --muted: #727272;
    --line: rgba(255, 255, 255, 0.07);
    --chip-on-bg: #e8e8e8;
    --chip-on-ink: #121213;
    --best: rgba(255, 255, 255, 0.06);
    --blob-1: rgba(255, 255, 255, 0.045);
    --blob-2: rgba(0, 0, 0, 0.5);
    --blob-3: rgba(255, 255, 255, 0.03);
    --chart-stack-l: 0.575; --chart-stack-c: 0.13;
    --chart-ink: #e8e8e8; --chart-ink-2: #a3a3a3; --chart-grid: rgba(255, 255, 255, 0.06);
    --chart-base: rgba(255, 255, 255, 0.28); --chart-hot: #ffffff; --chart-mark: #e8e8e8;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121213;
  --glass-bg: rgba(30, 30, 31, 0.55);
  --glass-bg-strong: rgba(30, 30, 31, 0.92);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hi: rgba(255, 255, 255, 0.05);
  --shadow: 0 16px 40px -24px rgba(0, 0, 0, 0.7);
  --ink: #e8e8e8;
  --ink-2: #a9a9a9;
  --muted: #727272;
  --line: rgba(255, 255, 255, 0.07);
  --chip-on-bg: #e8e8e8;
  --chip-on-ink: #121213;
  --best: rgba(255, 255, 255, 0.06);
  --blob-1: rgba(255, 255, 255, 0.045);
  --blob-2: rgba(0, 0, 0, 0.5);
  --blob-3: rgba(255, 255, 255, 0.03);
  --chart-stack-l: 0.575; --chart-stack-c: 0.13;
  --chart-ink: #e8e8e8; --chart-ink-2: #a3a3a3; --chart-grid: rgba(255, 255, 255, 0.06);
  --chart-base: rgba(255, 255, 255, 0.28); --chart-hot: #ffffff; --chart-mark: #e8e8e8;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 14.5px/1.65 var(--mono); -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
body::before {
  content: ""; position: fixed; inset: -20vmax; z-index: 0; pointer-events: none;
  background:
    radial-gradient(38vmax 38vmax at 18% 18%, var(--blob-1), transparent 70%),
    radial-gradient(34vmax 34vmax at 86% 12%, var(--blob-2), transparent 70%),
    radial-gradient(40vmax 40vmax at 70% 88%, var(--blob-3), transparent 70%);
  animation: drift 38s ease-in-out infinite alternate;
}
@keyframes drift { from { transform: translate3d(0, 0, 0); } to { transform: translate3d(-3vmax, 2vmax, 0) rotate(4deg); } }
#app { position: relative; z-index: 1; }
a { color: var(--ink); text-underline-offset: 3px; text-decoration-color: var(--muted); }
code { font: 500 0.92em var(--mono); background: var(--line); padding: 0.1em 0.35em; border-radius: 2px; }
::selection { background: var(--ink); color: var(--bg); }

.shell { max-width: 1120px; margin: 0 auto; padding: 0 16px 56px; }
.state { color: var(--muted); padding: 40vh 0; text-align: center; }

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  box-shadow: inset 0 1px 0 var(--glass-hi), var(--shadow);
}

/* ---- mode switch */
.modebar { position: absolute; top: 16px; right: 16px; z-index: 6; display: flex; gap: 8px; align-items: center; }
.seg { display: inline-flex; padding: 3px; border-radius: 4px; }
.seg button, .theme-btn {
  font: 500 12px var(--mono); color: var(--ink-2); background: none; border: 0; border-radius: 2px;
  padding: 6px 12px; cursor: pointer; transition: background .2s, color .2s;
}
.seg button.on { background: var(--chip-on-bg); color: var(--chip-on-ink); }
.theme-btn { padding: 8px 12px; }
.seg button:focus-visible, .theme-btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* ---- hero */
.hero { min-height: 86vh; display: flex; flex-direction: column; justify-content: center; padding: 96px 0 40px; }
.kicker { font-size: 12px; color: var(--muted); margin: 0 0 16px; letter-spacing: 0.02em; }
.hero-logo { display: block; width: 72px; height: 72px; margin: 0 0 20px; }
.hero h1 { font: 600 clamp(34px, 6.4vw, 72px)/1.05 var(--mono); letter-spacing: -0.035em; margin: 0; }
.lede { max-width: 58ch; margin: 22px 0 28px; font-size: clamp(15px, 1.6vw, 17px); color: var(--ink-2); }
.disclaimer { max-width: 760px; margin: 0 0 32px; padding: 16px 20px; }
.disclaimer p { margin: 0; }
.disclaimer-label { display: block; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.disclaimer-links { margin-top: 10px !important; display: flex; flex-wrap: wrap; gap: 4px 14px; }
.sep { display: none; }
.linkish {
  font: 500 14px var(--mono); color: var(--ink); background: none; border: 0; padding: 0; cursor: pointer;
  text-decoration: underline; text-decoration-color: var(--muted); text-underline-offset: 4px;
}
.linkish::after { content: " →"; }
.linkish[aria-expanded]::after { content: " ▸"; }
.linkish[aria-expanded="true"]::after { content: " ▾"; }
.linkish:hover { text-decoration-color: var(--ink); }
.linkish:focus-visible, .chip:focus-visible, canvas:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

/* ---- tiles */
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.tile { display: flex; flex-direction: column; gap: 2px; padding: 16px 18px; }
.tile-label { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.tile-value { font: 600 clamp(20px, 2.6vw, 28px)/1.2 var(--mono); letter-spacing: -0.02em; display: flex; align-items: center; gap: 8px; }
.tile-note { font-size: 12px; color: var(--muted); }
.tile-name .tile-value { font-size: clamp(15px, 1.6vw, 18px); white-space: nowrap; }

/* ---- sticky measure bar */
.rood { position: sticky; top: 10px; z-index: 5; margin: 0 0 48px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; padding: 10px 12px; background: var(--glass-bg-strong); }
.rood-label, .control-label { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.rood-note { font-size: 12px; color: var(--muted); margin-left: auto; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font: 500 12.5px var(--mono); color: var(--ink-2); background: transparent; border: 1px solid var(--glass-border);
  padding: 6px 12px; border-radius: 2px; cursor: pointer; transition: background .2s, color .2s, border-color .2s;
}
.chip:hover { color: var(--ink); border-color: var(--muted); }
.chip.on { background: var(--chip-on-bg); color: var(--chip-on-ink); border-color: var(--chip-on-bg); }
.models { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; padding: 10px 14px; margin: 0 0 12px; }
.model-boxes { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.model-box { display: inline-flex; align-items: center; gap: 7px; font: 500 12.5px var(--mono); color: var(--ink-2); cursor: pointer; }
.model-box input { margin: 0; accent-color: var(--chip-on-bg); cursor: pointer; }
.model-box input:disabled { cursor: not-allowed; }

/* ---- topics */
.topic { margin: 0 0 80px; scroll-margin-top: 90px; }
.topic-head { display: flex; gap: 16px; align-items: baseline; margin: 0 0 18px; }
.numeral { font: 500 14px var(--mono); color: var(--muted); }
.topic-head h2 { font: 600 clamp(22px, 3vw, 30px)/1.2 var(--mono); letter-spacing: -0.02em; margin: 0; }
.topic-sub { margin: 4px 0 0; color: var(--ink-2); font-size: 13.5px; }
.topic .tiles { margin-bottom: 12px; }

/* ---- tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
caption { caption-side: bottom; text-align: left; padding: 10px 18px 12px; color: var(--muted); font-size: 12px; }
th, td { padding: 11px 18px; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--line); }
thead th { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-2); vertical-align: bottom; }
thead th:first-child, tbody th { text-align: left; }
.eff { display: block; font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--muted); margin-top: 2px; }
tbody th { font-weight: 500; }
td { color: var(--ink-2); font-variant-numeric: tabular-nums; }
td sup { font-size: 10px; color: var(--muted); margin-left: 3px; }
td.best { color: var(--ink); font-weight: 600; background: var(--best); }
.cross { color: var(--ink); }
.none { color: var(--muted); }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }


/* ---- chart */
.controls { display: grid; grid-template-columns: auto 1fr; gap: 12px 18px; align-items: center; padding: 14px 16px; margin-bottom: 12px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0 4px 10px; font-size: 13px; color: var(--ink-2); }
.legend-item { display: inline-flex; align-items: center; gap: 8px; }
.canvas-wrap { padding: 10px 10px 0; container-type: inline-size; }
.canvas-box { position: relative; height: clamp(340px, 52cqi, 540px); height: round(clamp(340px, 52cqi, 540px), 1px); }
.canvas-box canvas { display: block; width: 100%; cursor: crosshair; }
/* the tooltip sits in the top corner away from the hovered stack */
.tip { top: 52px; }
.tip.at-left { left: 76px; }
.tip.at-right { right: 26px; }
.chart-note { color: var(--muted); font-size: 12.5px; max-width: 80ch; }
.tip { position: absolute; z-index: 3; pointer-events: none; min-width: 210px; max-width: 300px; padding: 12px 14px; font-size: 12.5px; color: var(--ink-2); background: var(--glass-bg-strong); }
.tip-head { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 600; }
.tip-sub { color: var(--muted); margin-top: 2px; }
.tip-model { margin-top: 10px; }
.tip-val { font-size: 20px; font-weight: 600; color: var(--ink); margin-top: 6px; }
.tip-full { font-size: 12px; font-weight: 400; color: var(--muted); }
.tip-runs { list-style: none; margin: 8px 0 0; padding: 8px 0 0; border-top: 1px solid var(--line); white-space: pre; font-size: 11.5px; }

/* ---- footer */
.foot { border-top: 1px solid var(--line); padding-top: 16px; color: var(--muted); font-size: 12.5px; }
.foot-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--line); }
.foot-mark { color: var(--ink); font-weight: 600; }
.foot-link { margin-left: auto; color: var(--ink); }

/* ---- vision and method, opened from the disclaimer */
.creed-text { margin-top: 14px; border-top: 1px solid var(--line); }
.creed-text h3 { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 22px 0 6px; }
.creed-text > :not(h3):first-child { margin-top: 18px; }
.creed-text p, .creed-text li { color: var(--ink); }
.creed-text p { margin: 0 0 10px; }
.creed-text ul { margin: 0 0 12px; padding-left: 20px; }
.creed-text li { margin-bottom: 4px; }
.creed-text li::marker { color: var(--muted); }
.creed-text em { font-style: normal; font-weight: 600; }

.lord { display: none; }

@media (max-width: 760px) {
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .controls { grid-template-columns: 1fr; }
  .rood { top: 6px; flex-wrap: nowrap; padding: 8px 10px; margin-bottom: 36px; }
  .rood-label, .rood-note { display: none; }
  .rood .chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .rood .chips::-webkit-scrollbar { display: none; }
  .rood .chip { flex: none; white-space: nowrap; }
  th, td { padding: 9px 12px; }
  .foot-link { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
}