:root {
  --bg: #F7F3EE;
  --card: rgba(255, 255, 255, 0.72);
  --ink: #2A201B;
  --ink2: #6B5D55;
  --muted: #8F8178;
  --line: #E6DED5;
  --grid: #EDE6DE;
  /* data colours (validated: tools in the README) */
  --dot: #BDB2A8;
  --dot-faint: #E2DAD2;
  --focal: #993300;
  --rival: #7D7068;
  --ramp-1: #D49D72;
  --ramp-2: #C07B49;
  --ramp-3: #A95A26;
  --ramp-4: #8C3404;
  --ramp-5: #5E2200;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17130F;
    --card: rgba(34, 28, 23, 0.78);
    --ink: #F1EAE3;
    --ink2: #B9ACA2;
    --muted: #8E8077;
    --line: #2E2721;
    --grid: #241E19;
    --dot: #5E5650;
    --dot-faint: #2C2621;
    --focal: #DB7034;
    --rival: #A3958B;
    --ramp-1: #7E4824;
    --ramp-2: #9C5A2C;
    --ramp-3: #BD6F36;
    --ramp-4: #DD8A4C;
    --ramp-5: #F3AE79;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #17130F;
  --card: rgba(34, 28, 23, 0.78);
  --ink: #F1EAE3;
  --ink2: #B9ACA2;
  --muted: #8E8077;
  --line: #2E2721;
  --grid: #241E19;
  --dot: #5E5650;
  --dot-faint: #2C2621;
  --focal: #DB7034;
  --rival: #A3958B;
  --ramp-1: #7E4824;
  --ramp-2: #9C5A2C;
  --ramp-3: #BD6F36;
  --ramp-4: #DD8A4C;
  --ramp-5: #F3AE79;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: 3px; }
b { font-weight: 600; }

/* ---------- scrolly: text left, sticky graphic right */
.scrolly {
  display: grid;
  grid-template-columns: minmax(300px, 34%) 1fr;
  position: relative;
}
.steps { grid-column: 1; grid-row: 1; padding: 0 24px 0 max(24px, 4vw); position: relative; z-index: 2; }
.graphic {
  grid-column: 2; grid-row: 1;
  position: sticky; top: 0;
  align-self: start;
  height: 100vh; height: 100svh;
}
#dots, #overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
#overlay { pointer-events: none; overflow: visible; }
#overlay .hit { pointer-events: all; cursor: default; }

.step {
  min-height: 92vh;
  display: flex; flex-direction: column; justify-content: center;
  max-width: 420px;
  opacity: 0.28;
  transition: opacity 400ms ease;
}
.step.is-active { opacity: 1; }
.step:last-child { min-height: 100vh; }
.step p { margin: 0 0 12px; }
.step.hero { min-height: 100vh; }
.kicker {
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.02em;
  color: var(--ink2);
  text-transform: uppercase;
}
h1 {
  font: 600 clamp(34px, 4.2vw, 56px)/1.05 var(--sans);
  letter-spacing: -0.025em;
  margin: 8px 0 18px;
}
.big {
  font: 600 clamp(48px, 6vw, 80px)/1 var(--sans);
  letter-spacing: -0.035em;
  margin-bottom: 10px !important;
}
.muted { color: var(--ink2); font-size: 15px; }
.hint { font: 500 13px/1 var(--mono); color: var(--muted); margin-top: 24px !important; }

/* developer console in the corner of the graphic */
.console {
  position: absolute; left: 20px; top: 20px; z-index: 3;
  margin: 0; max-width: min(560px, calc(100% - 40px));
  padding: 12px 14px;
  font: 400 12px/1.6 var(--mono);
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 2px rgba(42, 32, 27, 0.05), 0 8px 24px rgba(42, 32, 27, 0.06);
  white-space: pre-wrap;
  transition: opacity 250ms ease;
}
.console .p { color: var(--muted); }
.console .r { color: var(--ink2); }
.console .n { font-weight: 500; color: var(--ink); }

/* svg overlay text */
#overlay text { font-family: var(--mono); fill: var(--ink2); font-size: 11px; }
#overlay text.strong { fill: var(--ink); font-weight: 500; }
#overlay text.name { font-family: var(--sans); font-size: 13px; fill: var(--ink); }
#overlay text.name.focal { font-weight: 600; }
#overlay .gridline { stroke: var(--grid); stroke-width: 1; }
#overlay .baseline { stroke: var(--line); stroke-width: 1; }
#overlay .fade { transition: opacity 350ms ease; }

/* mini bars inside a step */
.minibars { display: grid; grid-template-columns: max-content 1fr max-content; gap: 6px 10px; align-items: center; margin-top: 10px; font-size: 14px; }
.minibars .lab { color: var(--ink2); }
.minibars .lab.focal { color: var(--ink); font-weight: 600; }
.minibars .track { height: 8px; position: relative; }
.minibars .bar { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 0 4px 4px 0; background: var(--dot); width: 0; transition: width 700ms cubic-bezier(.2,.7,.2,1); }
.minibars .bar.focal { background: var(--focal); }
.minibars .val { font: 500 13px/1 var(--mono); color: var(--ink); }

/* tooltip */
.tip {
  position: absolute; z-index: 4; pointer-events: none;
  padding: 8px 10px; max-width: 280px;
  font: 400 12px/1.5 var(--mono); color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(42, 32, 27, 0.10);
}
.tip .dim { color: var(--ink2); }
.tip .t { font-family: var(--sans); font-weight: 600; font-size: 13px; margin-bottom: 2px; }
.tip .sw { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }

/* ---------- table view */
.numbers { border-top: 1px solid var(--line); padding: 72px 0 96px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.numbers h2 { font: 600 32px/1.1 var(--sans); letter-spacing: -0.02em; margin: 0 0 8px; }
.numbers h3 { font: 600 17px/1.3 var(--sans); margin: 40px 0 12px; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; white-space: normal; min-width: 180px; }
th { font: 500 12px/1.3 var(--mono); color: var(--ink2); }
td { font-variant-numeric: tabular-nums; }
td.sig { font-weight: 600; }
tr.focal td:first-child { font-weight: 600; }
.method { padding-left: 18px; color: var(--ink2); font-size: 15px; }
.method li { margin-bottom: 8px; }

/* ---------- phones and tablets: graphic on top, text cards over the lower part */
@media (max-width: 900px) {
  .scrolly { display: block; }
  .graphic { position: sticky; top: 0; height: 100svh; z-index: 1; }
  .steps { margin-top: -100svh; padding: 0 16px; pointer-events: none; }
  .step .card { pointer-events: auto; }
  .step {
    min-height: 100svh;
    justify-content: flex-end;
    padding-bottom: 6svh;
    max-width: none;
    opacity: 1;
  }
  .step .card {
    background: var(--card);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 16px 16px 6px;
    box-shadow: 0 8px 28px rgba(42, 32, 27, 0.10);
  }
  .step.hero h1 { font-size: 32px; }
  .big { font-size: 44px; }
  .console { left: 12px; right: 12px; top: 12px; max-width: none; font-size: 10.5px; padding: 8px 10px; }
  body { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .step, .console, #overlay .fade, .minibars .bar { transition: none; }
}