:root {
  --ground: #000000;
  --ink: #F4F5F0;
  --rule: #23261F;
  --rule-strong: #3A3E33;
  --muted: #8E948A;
  --neon: #CCFF00;
  --neon-soft: rgba(204, 255, 0, 0.14);
  --neon-glow: rgba(204, 255, 0, 0.55);
  --panel: #0C0E0A;
  --gutter: clamp(20px, 8vw, 128px);
  --measure: 62ch;
  --font: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { background: var(--ground); color: var(--ink); color-scheme: dark; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  font-variation-settings: "wdth" 100;
  -webkit-font-smoothing: antialiased;
  background: var(--ground);
}

a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--neon); outline-offset: 3px; }
::selection { background: var(--neon); color: #000; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Header */
.top {
  display: flex; align-items: baseline; justify-content: space-between; gap: 24px;
  padding: 28px var(--gutter) 0;
}
.wordmark {
  font-weight: 800; font-size: 21px; letter-spacing: 0.01em; text-decoration: none; color: var(--neon);
  font-variation-settings: "wdth" 118;
}
.nav { display: flex; gap: 22px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero {
  padding: 6vh var(--gutter) 4vh;
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px clamp(32px, 6vw, 96px); align-items: end;
}
.hero-text { min-width: 0; }
h1 {
  margin: 0 0 28px;
  font-size: clamp(34px, 4.8vw, 72px);
  line-height: 1.0;
  letter-spacing: -0.03em;
  font-weight: 700;
  max-width: 18ch;
  text-wrap: balance;
}
.lede { max-width: var(--measure); font-size: clamp(18px, 1.5vw, 22px); line-height: 1.45; margin: 0 0 34px; color: #C9CDC4; }
.actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 0; }

.button {
  display: inline-block; padding: 13px 22px; border: 1.5px solid var(--neon); border-radius: 2px;
  background: var(--neon); color: #000; text-decoration: none; font-weight: 640; font-size: 16px;
  cursor: pointer; font-family: inherit; line-height: 1.2;
}
.button.quiet { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.button:hover { background: #E3FF5C; border-color: #E3FF5C; }
.button.quiet:hover { border-color: var(--neon); color: var(--neon); background: transparent; }

/* Readouts (in the hero) */
.readouts {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 28px;
  margin: 0; padding: 0;
}
.readouts > div { border-top: 1px solid var(--rule-strong); padding-top: 12px; }
.readouts dt { font-size: 14px; color: var(--muted); margin: 0 0 6px; }
.readouts dd { margin: 0; font-size: clamp(22px, 2.3vw, 32px); font-weight: 640; letter-spacing: -0.02em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.readouts dd.sub { font-size: 13.5px; font-weight: 400; color: var(--muted); letter-spacing: 0; margin-top: 7px; line-height: 1.35; }
.readouts dd.gap { color: var(--neon); text-shadow: 0 0 18px var(--neon-glow); }
.readouts dd.fresh { color: var(--ink); }

/* Instrument */
.instrument { padding: 0 0 4vh; }
.inst-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; padding: 0 var(--gutter) 14px; flex-wrap: wrap; }
.inst-pick { display: flex; gap: 2px; }
.pick {
  font: inherit; font-size: 15px; font-weight: 600; padding: 6px 12px; border: 0; background: transparent; color: var(--muted);
  border-bottom: 2px solid transparent; cursor: pointer; font-variation-settings: "wdth" 110;
}
.pick.is-on { color: var(--neon); border-bottom-color: var(--neon); }
.pick:hover { color: var(--ink); }
.inst-legend { margin: 0; font-size: 14px; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.key { display: inline-block; width: 22px; height: 0; border-top: 2px solid var(--ink); margin-left: 12px; vertical-align: middle; }
.key.oracle { border-top-color: var(--ink); }
.key.pool { border-top-color: var(--neon); box-shadow: 0 0 8px var(--neon-glow); }
.key.gap { height: 10px; border: 0; background: var(--neon-soft); }
.inst-legend .key:first-child { margin-left: 0; }

.chart-wrap { position: relative; border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong); background: var(--panel); }
.chart { display: block; width: 100%; height: clamp(260px, 38vw, 460px); }
.chart .grid { stroke: var(--rule); stroke-width: 1; }
.chart .oracle { stroke: var(--ink); stroke-width: 1.5; fill: none; }
.chart .pool { stroke: var(--neon); stroke-width: 2.4; fill: none; stroke-linejoin: round; stroke-linecap: round; filter: url(#glow); }
.chart .fill { fill: var(--neon-soft); }
.chart .marker { fill: var(--neon); filter: url(#glow); }
.chart .label { font-family: var(--font); font-size: 13px; fill: var(--muted); }
.chart .label.strong { fill: var(--ink); font-weight: 600; }
.chart .label.neon { fill: var(--neon); font-weight: 700; }
.chart .close-line { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 4; }
.axis { display: flex; justify-content: space-between; padding: 8px var(--gutter) 0; font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.inst-note { margin: 22px var(--gutter) 0; max-width: var(--measure); font-size: 14px; color: var(--muted); }

/* Sections */
.section { padding: 11vh var(--gutter) 2vh; }
h2 { font-size: clamp(28px, 3.2vw, 44px); letter-spacing: -0.025em; line-height: 1.05; margin: 0 0 34px; font-weight: 700; max-width: 24ch; }
h3 { font-size: 19px; margin: 0 0 10px; font-weight: 640; font-variation-settings: "wdth" 110; letter-spacing: 0; color: var(--ink); }
.cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; max-width: 1240px; }
.cols p { margin: 0; max-width: 46ch; color: #C9CDC4; }
p { max-width: var(--measure); }

.table-intro { color: var(--muted); margin: 0 0 18px; }
.section h3 + .table-intro { margin-top: -4px; }
.section h2 + h3, .cols + h3 { margin-top: 64px; }

.table-scroll { overflow-x: auto; max-width: 1240px; }
table.basis { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; font-size: 16px; }
table.basis th, table.basis td { text-align: left; padding: 10px 24px 10px 0; border-top: 1px solid var(--rule); white-space: nowrap; }
table.basis th { font-weight: 560; color: var(--muted); font-size: 14px; border-top: 0; }
table.basis td.num { text-align: right; padding-right: 32px; }
table.basis th.num { text-align: right; padding-right: 32px; }
table.basis td.pos { color: var(--neon); }
table.basis td.neg { color: var(--muted); }
table.basis tr:last-child td { border-bottom: 1px solid var(--rule); }

.contract { max-width: 1000px; margin: 0 0 60px; }
.contract p { max-width: var(--measure); color: #C9CDC4; }
pre {
  margin: 20px 0; padding: 18px 20px; overflow-x: auto; background: var(--panel); border-left: 3px solid var(--neon);
  font-family: var(--mono); font-size: 14px; line-height: 1.55; color: var(--ink);
}
code { font-family: var(--mono); }
.status-line { color: var(--muted); font-size: 15px; }

/* Checker */
.checker { display: flex; gap: 10px; max-width: 760px; margin: 0 0 12px; }
.checker input {
  flex: 1; min-width: 0; font: inherit; font-family: var(--mono); font-size: 15px; padding: 12px 14px;
  border: 1.5px solid var(--rule-strong); border-radius: 2px; background: var(--panel); color: var(--ink);
}
.checker input:focus { border-color: var(--neon); outline: none; }
.checker input::placeholder { color: var(--muted); }
.examples { font-size: 15px; color: var(--muted); margin: 0 0 20px; }
.linkish { font: inherit; background: none; border: 0; padding: 0; color: var(--ink); text-decoration: underline; text-decoration-color: var(--neon); cursor: pointer; }
.result { max-width: 760px; border-top: 2px solid var(--ink); padding: 16px 0 6px; margin-bottom: 16px; }
.result h4 { margin: 0 0 8px; font-size: 22px; letter-spacing: -0.01em; font-weight: 700; }
.result.ok h4 { color: var(--neon); text-shadow: 0 0 18px var(--neon-glow); }
.result.no h4 { color: #FF6A3D; }
.result dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 6px 20px; font-size: 14px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; font-family: var(--mono); word-break: break-all; }
.result p { margin: 10px 0 0; font-size: 15px; color: #C9CDC4; }
.fineprint { font-size: 14px; color: var(--muted); }

/* Footer */
.foot { padding: 8vh var(--gutter) 40px; border-top: 1px solid var(--rule); margin-top: 8vh; color: var(--muted); font-size: 14px; }
.foot p { max-width: 80ch; margin: 0 0 10px; }
.foot-meta { margin-top: 24px; }

/* Motion: one drawn line on load, nothing else unasked */
@media (prefers-reduced-motion: no-preference) {
  .chart .pool.draw { stroke-dasharray: var(--len); stroke-dashoffset: var(--len); animation: draw 1.8s cubic-bezier(.4,0,.2,1) forwards; }
  .chart .fill.draw { opacity: 0; animation: appear .7s ease-out 1.4s forwards; }
  .chart .marker.draw, .chart .label.neon.draw { opacity: 0; animation: appear .3s ease-out 1.7s forwards; }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes appear { to { opacity: 1; } }

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 8vh; }
  .cols { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .top { flex-direction: column; gap: 10px; }
  .nav { gap: 14px; }
  .nav a { font-size: 14px; }
  .readouts { grid-template-columns: 1fr; gap: 18px; }
  .checker { flex-direction: column; }
  .inst-head { align-items: start; }
}