:root {
  --paper: #e7e2d8;
  --paper-2: #f0ece4;
  --paper-3: #dcd6c9;
  --soot: #13110f;
  --soot-2: #1e1b17;
  --ink: #16130f;
  --ink-2: #4a443c;
  --ember: #a33f0b;
  --ember-b: #e2621a;
  --rule: #b6ae9d;
  --rule-d: #45403a;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 66ch;
  --seam: clamp(56px, 8vw, 116px);
  --ramp9: linear-gradient(90deg, #e7e2d8 0 11.11%, #ccc8bf 11.11% 22.22%, #b2aea6 22.22% 33.33%,
    #98948d 33.33% 44.44%, #7d7a74 44.44% 55.55%, #625f5a 55.55% 66.66%, #484541 66.66% 77.77%,
    #2d2b28 77.77% 88.88%, #13110f 88.88% 100%);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 clamp(1rem, 0.96rem + 0.2vw, 1.115rem)/1.62 var(--serif);
  overflow-x: hidden;
}

body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.55;
  background-image:
    repeating-linear-gradient(0deg, rgba(23, 19, 15, 0.035) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(23, 19, 15, 0.028) 0 1px, transparent 1px 4px),
    radial-gradient(60% 45% at 18% 8%, rgba(120, 104, 80, 0.10), transparent 70%),
    radial-gradient(55% 40% at 88% 72%, rgba(90, 78, 60, 0.09), transparent 70%);
}

.wrap { width: 100%; max-width: 1120px; margin-inline: auto; padding-inline: 24px; position: relative; z-index: 1; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 30; background: var(--soot); color: var(--paper);
  padding: 12px 18px; font: 600 13px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.12em;
}
.skip:focus { left: 8px; top: 8px; }

.defs { position: absolute; width: 0; height: 0; overflow: hidden; }

a { color: var(--ember); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); }

:focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; }
.band :focus-visible, .chip:focus-visible { outline-color: var(--ember-b); }

.site { border-bottom: 1px solid var(--rule); background: var(--paper); position: relative; z-index: 12; }
.bar { display: flex; align-items: center; gap: 16px; min-height: 66px; flex-wrap: wrap; }

.brand {
  font: 700 14px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.2em; color: var(--ink);
  text-decoration: none; display: inline-flex; align-items: center; gap: 10px; margin-right: auto;
}
.brand-mark { width: 44px; height: 13px; background: var(--ramp9); border: 1px solid var(--ink); }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.13em; color: var(--ink-2);
  text-decoration: none; padding: 9px 11px; border: 1px solid transparent;
}
.nav a:hover, .nav a:focus-visible { color: var(--ink); border-color: var(--rule); background: var(--paper-2); }

.navtoggle {
  display: none; align-items: center; gap: 9px; background: none; border: 1px solid var(--ink); color: var(--ink);
  font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.14em; padding: 10px 13px;
  cursor: pointer;
}
.navtoggle-ico { width: 20px; height: 11px; background: var(--ramp9); border: 1px solid var(--ink); }

.hero { border-bottom: 1px solid var(--rule); padding-block: clamp(40px, 7vw, 82px) clamp(36px, 6vw, 70px); }

.kicker {
  font: 500 11.5px/1.5 var(--mono); text-transform: uppercase; letter-spacing: 0.19em; color: var(--ink-2);
  margin: 0 0 20px;
}
.kicker::before { content: "▮ "; color: var(--ember); }

h1 {
  font: 700 clamp(2.5rem, 1.3rem + 5.2vw, 4.6rem)/1.02 var(--sans);
  letter-spacing: -0.028em; margin: 0 0 22px; max-width: 16ch; text-wrap: balance;
}
.h1-l { display: block; }
h1 em { font-style: italic; color: var(--ember); }

.deck { font-size: 1.06em; color: var(--ink-2); max-width: var(--measure); margin: 0 0 28px; }
.deck-w { max-width: 72ch; }

.ramp { height: 26px; border: 1px solid var(--ink); }
.ramp-9 { background: var(--ramp9); }
.ramplab {
  display: flex; justify-content: space-between; font: 500 11px/1 var(--mono); text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--ink-2); margin: 9px 0 30px;
}

.herolinks { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; }

.btn {
  display: inline-block; background: var(--soot); color: var(--paper); border: 1px solid var(--soot);
  padding: 13px 20px; font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.15em;
  text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--ember); border-color: var(--ember); color: #fff; }
.btn-ghost { background: none; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.sect { padding-block: var(--seam); }
.sect-tight { padding-block: clamp(44px, 6vw, 82px); }
.band {
  background: var(--soot); color: var(--paper); padding-block: var(--seam);
  border-block: 1px solid var(--ink);
}
.band .kicker, .band .deck, .band .stepinfo { color: #c6bfb0; }
.band .kicker::before { color: var(--ember-b); }
.band a { color: var(--ember-b); }
.band a:hover { color: var(--paper); }

.h-lead {
  font: 700 clamp(1.7rem, 1.1rem + 2.4vw, 2.7rem)/1.08 var(--sans);
  letter-spacing: -0.02em; margin: 0 0 20px; max-width: 20ch; text-wrap: balance;
}

.guide { border-top: 1px solid var(--rule); }
.guide:last-of-type { border-bottom: 1px solid var(--rule); }

.guide summary {
  display: flex; align-items: baseline; gap: 18px; padding: 22px 46px 22px 0; cursor: pointer;
  position: relative; list-style: none;
}
.guide summary::-webkit-details-marker { display: none; }
.guide summary::after {
  content: ""; position: absolute; right: 2px; top: 50%; width: 34px; height: 10px;
  transform: translateY(-50%); background: var(--ramp9); border: 1px solid var(--ink-2);
  transition: width 0.18s ease;
}
.guide[open] summary::after { width: 14px; background: var(--ember); border-color: var(--ember); }
.guide summary:hover { background: var(--paper-2); }

.g-num {
  font: 600 12px/1 var(--mono); letter-spacing: 0.14em; color: var(--ember); flex: 0 0 auto; padding-top: 4px;
}
.g-ttl {
  font: 600 clamp(1.15rem, 1rem + 0.8vw, 1.5rem)/1.22 var(--sans); letter-spacing: -0.012em;
  text-wrap: balance;
}

.g-body { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 0 32px; padding: 0 0 34px; }
.g-text { max-width: var(--measure); }
.g-text > p { margin: 0 0 1.05em; }
.g-text strong { font-weight: 700; }
.g-text em { color: var(--ink); }

.margin-note {
  margin: 4px 0 0; font: 500 11px/1.5 var(--mono); text-transform: uppercase; letter-spacing: 0.17em;
  color: var(--ink-2); border-top: 2px solid var(--ember); padding-top: 8px;
}

.grades { border-collapse: collapse; width: 100%; margin: 4px 0 1.3em; font-size: 0.93em; }
.grades caption {
  text-align: left; font: 500 11px/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--ink-2); padding-bottom: 8px;
}
.grades th, .grades td {
  border-top: 1px solid var(--rule); padding: 9px 12px 9px 0; text-align: left; vertical-align: baseline;
}
.grades th { font: 600 12px/1.5 var(--mono); letter-spacing: 0.08em; white-space: nowrap; width: 8.5rem; }
.grades td { color: var(--ink-2); }

.specs {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--rule-d);
  border: 1px solid var(--rule-d); margin-top: 34px;
}
.spec { margin: 0; background: var(--paper); padding: 18px; }
.spec svg { display: block; width: 100%; height: auto; background: var(--paper-2); border: 1px solid var(--rule); }
.spec figcaption { display: block; padding-top: 12px; color: var(--ink); }
.spec b {
  display: block; font: 600 12px/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.13em;
  color: var(--ink);
}
.spec span { display: block; font-size: 0.88em; color: var(--ink-2); margin-top: 4px; }

.bench { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule); margin-top: 34px;
  border: 1px solid var(--rule); }
.panel { background: var(--paper-2); padding: clamp(20px, 3vw, 32px); }
.panel h3 {
  margin: 0 0 18px; font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--ember); border-bottom: 1px solid var(--rule); padding-bottom: 12px;
}

.seg { display: flex; gap: 0; margin-bottom: 22px; border: 1px solid var(--ink); width: fit-content; }
.seg button {
  background: none; border: 0; border-right: 1px solid var(--ink); color: var(--ink-2); cursor: pointer;
  font: 600 11.5px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.13em; padding: 11px 14px;
}
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.seg button:hover { color: var(--ember); }
.seg button[aria-pressed="true"]:hover { color: var(--ember-b); }

.scale { list-style: none; margin: 0; padding: 0; display: grid; grid-auto-flow: column; grid-auto-columns: 1fr;
  border: 1px solid var(--ink); }
.scale li { display: block; }
.sw {
  display: block; width: 100%; padding: 0; border: 0; border-right: 1px solid var(--ink); background: none;
  cursor: pointer; text-align: center;
}
.scale li:last-child .sw { border-right: 0; }
.sw-chip { display: block; height: 92px; }
.sw-n {
  display: block; font: 600 11px/1 var(--mono); letter-spacing: 0.08em; padding: 7px 0; color: var(--ink-2);
  border-top: 1px solid var(--ink); background: var(--paper);
}
.sw[aria-pressed="true"] .sw-n { background: var(--ember); color: #fff; }
.sw:hover .sw-n { color: var(--ember); }
.sw[aria-pressed="true"]:hover .sw-n { color: #fff; }

.stepinfo {
  margin: 16px 0 0; font-size: 0.94em; color: var(--ink-2); border-left: 2px solid var(--ember);
  padding-left: 14px; min-height: 3.2em;
}
.stepinfo b { color: var(--ink); font: 600 12px/1.6 var(--mono); letter-spacing: 0.08em; }

.hint { margin: 0 0 20px; font-size: 0.92em; color: var(--ink-2); }
.match { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--ink);
  border: 1px solid var(--ink); }
.chip { height: 108px; }
.chiplab {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 22px;
  font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.16em; color: var(--ink-2);
}
.chiplab span:last-child { text-align: right; }

.slabel { display: block; font-size: 0.9em; color: var(--ink-2); margin: 0 0 10px; }
.sval { display: block; font: 600 12px/1 var(--mono); letter-spacing: 0.1em; color: var(--ink); margin: 12px 0 20px; }

input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; background: none; height: 26px; }
input[type="range"]::-webkit-slider-runnable-track {
  height: 20px; background: var(--ramp9); border: 1px solid var(--ink);
}
input[type="range"]::-moz-range-track { height: 20px; background: var(--ramp9); border: 1px solid var(--ink); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 12px; height: 32px; margin-top: -7px;
  background: var(--ember); border: 1px solid var(--soot); cursor: ew-resize;
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 32px; border-radius: 0; background: var(--ember); border: 1px solid var(--soot);
  cursor: ew-resize;
}

.acts { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 18px; }
.verdict { margin: 0 0 12px; font-size: 0.96em; border-left: 2px solid var(--ember); padding-left: 14px;
  min-height: 3em; color: var(--ink); }
.streak { margin: 0; font: 500 11px/1.6 var(--mono); text-transform: uppercase; letter-spacing: 0.13em;
  color: var(--ink-2); }
.streak b { color: var(--ink); }
.streak span { white-space: nowrap; }

.ladder { max-width: var(--measure); margin: 26px 0 0; padding: 0; list-style: none; counter-reset: step; }
.ladder li {
  counter-increment: step; border-top: 1px solid var(--rule); padding: 20px 0 20px 62px; position: relative;
  color: var(--ink-2);
}
.ladder li:last-child { border-bottom: 1px solid var(--rule); }
.ladder li::before {
  content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 22px;
  font: 600 12px/1 var(--mono); letter-spacing: 0.12em; color: var(--ember);
}
.ladder b { color: var(--ink); }

.site-foot { border-top: 1px solid var(--rule); padding-block: 44px 56px; }
.foot-in { display: grid; gap: 18px; }
.foot-brand { margin: 0; font: 700 13px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.19em; }
.foot-brand span { color: var(--ink-2); font-weight: 500; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.foot-nav a {
  font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.13em; color: var(--ink-2);
  text-decoration: none; border-bottom: 1px solid var(--rule); padding-bottom: 3px;
}
.foot-nav a:hover { color: var(--ember); border-color: var(--ember); }
.foot-note { margin: 0; max-width: 56ch; font-size: 0.9em; color: var(--ink-2); }

@media (min-width: 901px) {

  .panel-scale { display: flex; flex-direction: column; }
  .panel-scale .scale { flex: 1 1 auto; }
  .scale li { display: flex; }
  .sw { display: flex; flex-direction: column; }
  .sw-chip { flex: 1 1 auto; min-height: 92px; }
}

@media (max-width: 900px) {
  .specs { grid-template-columns: repeat(2, 1fr); }
  .bench { grid-template-columns: 1fr; }
  .g-body { grid-template-columns: 1fr; gap: 0; }
  .margin-note { margin-bottom: 20px; display: inline-block; }
}

@media (max-width: 720px) {
  .navtoggle { display: inline-flex; }
  .bar { min-height: 60px; }
  .nav {
    display: none; flex-direction: column; width: 100%; gap: 0; border-top: 1px solid var(--rule);
    padding-block: 8px 14px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 4px; border-bottom: 1px solid var(--paper-3); }
  .specs { grid-template-columns: 1fr; }
  .hero { padding-block: 34px 34px; }
  .scale { grid-auto-flow: row; }
  .sw { display: grid; grid-template-columns: 1fr 64px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .scale li:last-child .sw { border-bottom: 0; }
  .sw-chip { height: 40px; }
  .sw-n { border-top: 0; border-left: 1px solid var(--ink); padding: 0; display: grid; place-items: center; }
  .btn { flex: 1 1 auto; text-align: center; }
  .guide summary { padding-right: 34px; gap: 12px; }
  .guide summary::after { width: 22px; }
  .grades th { width: 6.2rem; }
  .ladder li { padding-left: 46px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; }
}

@media (prefers-contrast: more) {
  :root { --ink-2: #2a251f; --rule: #8d8574; --ember: #8f3408; }
}

@media print {
  body::before, .navtoggle, .site-foot .foot-nav { display: none; }
  .band { background: #fff; color: #000; }
  .guide .g-body { display: block; }
}