/* Alvar. Drafting-room palette: film, graphite, non-photo blue construction lines, yellow trace for Alvar's work. */
:root {
  --film: #f1f2ef;
  --sheet: #ffffff;
  --graphite: #24272b;
  --lead: #5d6268;
  --faint: #9297a0;
  --rule: rgba(36, 39, 43, 0.13);
  --rule-strong: rgba(36, 39, 43, 0.3);
  --blue: #7db6cc;
  --blue-ink: #2f7896;
  --trace: #f2de6a;
  --trace-ink: #6e5c00;
  --font: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --gutter: clamp(16px, 4.5vw, 64px);
  --maxw: 1280px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--film);
  color: var(--graphite);
  font: 400 18px/1.55 var(--font);
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: var(--trace); color: var(--graphite); }
a { color: inherit; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 600; }
:focus-visible { outline: 2px solid var(--blue-ink); outline-offset: 3px; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; gap: 28px;
  padding: 16px var(--gutter);
  background: linear-gradient(rgba(241, 242, 239, 0.97), rgba(241, 242, 239, 0.75) 60%, rgba(241, 242, 239, 0));
  transition: background .3s, box-shadow .3s;
}
.nav.solid { background: var(--film); box-shadow: 0 1px 0 var(--rule); }
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; }
.brand span { font-size: 25px; font-weight: 660; font-stretch: 108%; letter-spacing: -0.035em; line-height: 1; }
.brand-mark { width: 30px; height: 30px; display: block; }
.brand-mark .t { fill: #1d2125; }
.brand-mark .g { fill: #fff; }
.foot .brand-mark .t { fill: #fff; }
.foot .brand-mark .g { fill: #1d2125; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { text-decoration: none; font-size: 15px; color: var(--lead); }
.nav-links a:hover, .nav-links a[aria-current] { color: var(--graphite); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 48px; padding: 0 22px; white-space: nowrap;
  background: var(--graphite); color: var(--sheet);
  border: 1px solid var(--graphite); border-radius: 3px;
  font: 600 16px/1 var(--font); font-stretch: 104%; text-decoration: none; cursor: pointer;
}
.btn:hover { background: #3a3e44; }
.btn-quiet { background: transparent; color: var(--graphite); border-color: var(--rule-strong); }
.btn-quiet:hover { background: var(--sheet); border-color: var(--graphite); }
.btn-small { height: 38px; padding: 0 16px; font-size: 14px; }
.btn-trace { background: var(--trace); color: var(--graphite); border-color: var(--trace); margin-top: 32px; height: 54px; padding: 0 28px; font-size: 17px; }
.btn-trace:hover { background: #f7e98f; }

/* story */
.story { position: relative; }
.story-stage { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; background: var(--film); }
.story-stage::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: 1;
  background: radial-gradient(ellipse 72% 82% at 64% 54%, rgba(241,242,239,0) 55%, rgba(241,242,239,.75) 82%, var(--film) 100%);
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; z-index: 0; }
.hero-labels { position: absolute; inset: 0; pointer-events: none; z-index: 2; }
.hl {
  position: absolute; left: 0; top: 0;
  font-size: 13px; font-weight: 500; font-stretch: 80%; letter-spacing: .01em;
  color: var(--graphite); white-space: nowrap;
  transform: translate(-50%, -50%);
  transition: opacity .35s;
}
.hl.lead { transform: translate(0, -100%); padding: 0 0 12px 0; border-left: 1.5px solid #fff; }
.hl.lead > span { display: inline-block; background: rgba(255,255,255,.94); padding: 3px 8px; box-shadow: 0 2px 10px rgba(20,24,28,.18); }
.hl.lead::before { content: ""; position: absolute; left: -4px; bottom: -4px; width: 7px; height: 7px; border-radius: 50%; background: #fff; box-shadow: 0 0 0 1.5px var(--graphite); }
.hl.tr { color: var(--trace-ink); }
.hl.tr.lead::before { background: #c9a90b; }
.hl.blue { color: var(--blue-ink); }
.hl.bubble { width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--blue-ink); color: var(--blue-ink); display: grid; place-items: center; background: var(--sheet); font-size: 11px; font-stretch: 100%; }
.hl.plain { color: var(--blue-ink); }

.stage-rail {
  position: absolute; z-index: 3; right: var(--gutter); top: 50%; transform: translateY(-50%);
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 12px; align-items: flex-end;
  font-size: 14px; font-stretch: 80%; font-weight: 500; color: var(--faint);
}
.stage-rail li { display: flex; align-items: center; gap: 10px; transition: color .3s; }
.stage-rail li::after { content: ""; width: 16px; height: 3px; background: var(--rule); transition: width .3s, background .3s; }
.stage-rail li.on { color: var(--graphite); }
.stage-rail li.on::after { width: 40px; background: var(--trace); }

.story-steps { position: relative; z-index: 2; margin-top: -100vh; margin-top: -100svh; pointer-events: none; }
.step {
  min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px var(--gutter) 80px;
  max-width: calc(560px + var(--gutter) * 2);
  pointer-events: none;
  background: linear-gradient(90deg, var(--film) 0%, rgba(241,242,239,.94) 68%, rgba(241,242,239,0) 100%);
}
.step > * { pointer-events: auto; max-width: 440px; }
.step-intro { max-width: calc(720px + var(--gutter) * 2); background: linear-gradient(90deg, var(--film) 0%, rgba(241,242,239,.9) 55%, rgba(241,242,239,0) 100%); }
.step-intro > * { max-width: 700px; }
.step h1 { font-size: clamp(42px, 5vw, 74px); font-stretch: 112%; font-weight: 640; line-height: .98; letter-spacing: -0.04em; }
.lede { margin-top: 28px; font-size: 20px; line-height: 1.5; color: var(--lead); max-width: 34em; }
.cta-row { display: flex; gap: 12px; margin-top: 36px; flex-wrap: wrap; }
.step-k { font-size: 15px; font-stretch: 80%; font-weight: 600; color: var(--blue-ink); margin-bottom: 14px; }
.step h2 { font-size: clamp(32px, 3.4vw, 46px); font-stretch: 112%; font-weight: 620; line-height: 1.04; letter-spacing: -0.03em; margin-bottom: 18px; }
.step p { color: var(--lead); }
.tools { margin-top: 20px; font-size: 14px; font-stretch: 80%; font-weight: 500; color: var(--faint); }

/* work log over the story */
.worklog {
  position: absolute; z-index: 3; right: var(--gutter); bottom: 28px; width: 320px;
  background: rgba(255, 255, 255, 0.94); border: 1px solid var(--rule); border-radius: 4px;
  box-shadow: 0 12px 40px rgba(20, 24, 28, .16);
  padding: 14px 16px 10px;
  opacity: 0; transform: translateY(8px); transition: opacity .4s, transform .4s;
}
.worklog.on { opacity: 1; transform: none; }
.wl-title { font-size: 12px; font-stretch: 85%; color: var(--faint); }
.wl-job { font-size: 15px; font-weight: 600; margin: 2px 0 10px; }
.worklog ol { list-style: none; margin: 0; padding: 0; }
.worklog li { display: grid; grid-template-columns: 46px 1fr auto; align-items: center; gap: 8px; padding: 7px 8px; margin: 0 -8px; border-radius: 3px; font-size: 14px; color: var(--faint); transition: background .3s, color .3s; }
.worklog .ic { display: flex; gap: 4px; }
.worklog .ic img, .worklog .ic svg { width: 18px; height: 18px; opacity: .45; transition: opacity .3s; }
.worklog .st { font-size: 12px; font-stretch: 85%; }
.worklog li.done { color: var(--graphite); }
.worklog li.done .ic img, .worklog li.done .ic svg, .worklog li.now .ic img, .worklog li.now .ic svg { opacity: 1; }
.worklog li.done .st::before { content: "✓ "; color: var(--blue-ink); }
.worklog li.now { background: var(--trace); color: var(--graphite); font-weight: 600; }

.msg { margin: 6px 0 18px; padding: 16px 18px; background: var(--sheet); border-left: 3px solid var(--trace); box-shadow: 0 8px 30px rgba(20,24,28,.08); }
.msg-to { font-size: 13px; font-stretch: 85%; color: var(--faint); margin-bottom: 6px; }
.msg p:last-child { color: var(--graphite) !important; font-size: 19px; line-height: 1.45; }
.tools img { width: 18px; height: 18px; vertical-align: -4px; margin-right: 6px; }
.tools img:not(:first-child) { margin-left: 10px; }

.logos-sec { background: var(--sheet); padding: clamp(64px, 8vw, 104px) 0; }
.logos-sec .sec-title { font-size: clamp(28px, 3vw, 40px); }
.logos { list-style: none; margin: 36px 0 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }
.logos li { display: flex; align-items: center; gap: 12px; padding: 16px 16px; background: var(--film); border-radius: 4px; font-weight: 550; font-size: 16px; }
.logos img { width: 28px; height: 28px; object-fit: contain; }


/* site form in the hero */
.site-form { margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--rule); max-width: 560px; }
.site-form label { display: block; font-size: 15px; font-weight: 600; margin-bottom: 10px; }
.sf-row { display: flex; gap: 8px; }
.sf-row input { flex: 1; min-width: 0; height: 44px; padding: 0 14px; border: 1px solid var(--rule-strong); border-radius: 3px; background: var(--sheet); font: 400 16px var(--font); color: var(--graphite); }
.sf-row input:focus { outline: 2px solid var(--blue-ink); outline-offset: 1px; border-color: transparent; }
.sf-row .btn { height: 44px; }
.sf-row .btn:disabled { opacity: .5; cursor: progress; }
.sf-status { margin-top: 10px; font-size: 14px; color: var(--lead); max-width: 34em; }
.site-caption { position: absolute; z-index: 3; left: 46%; bottom: 16px; font-size: 12px; font-stretch: 88%; color: var(--lead); max-width: 23%; line-height: 1.4; }


/* live reading log over the model */
.reading {
  position: absolute; z-index: 3; top: 92px; right: var(--gutter); width: 390px;
  background: rgba(255, 255, 255, 0.95); border: 1px solid var(--rule); border-radius: 4px;
  box-shadow: 0 14px 44px rgba(20, 24, 28, .14);
  padding: 14px 16px 12px; pointer-events: none;
  opacity: 0; transform: translateY(-6px); transition: opacity .45s, transform .45s;
}
.reading.on { opacity: 1; transform: none; }
.reading.on.away { opacity: 0; }
.rd-title { font-size: 12px; font-stretch: 85%; color: var(--faint); margin-bottom: 10px; }
.reading ol { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.reading li { display: grid; grid-template-columns: 14px 1fr; column-gap: 10px; font-size: 13.5px; line-height: 1.35; animation: rd-in .35s ease-out; }
.rd-ic { grid-row: span 2; width: 12px; height: 12px; margin-top: 3px; border-radius: 50%; border: 1.6px solid var(--rule-strong); border-top-color: var(--graphite); animation: rd-spin .8s linear infinite; }
.reading li.done .rd-ic { animation: none; border: 0; background: var(--blue-ink) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 6.2l2 2 4-4.4' fill='none' stroke='%23fff' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 12px no-repeat; }
.reading li.bad .rd-ic { animation: none; border: 0; background: #b5462f; }
.rd-k { font-weight: 600; color: var(--graphite); }
.rd-v { color: var(--lead); }
.rd-v:empty { display: none; }
@keyframes rd-spin { to { transform: rotate(360deg); } }
@keyframes rd-in { from { opacity: 0; transform: translateY(4px); } }


/* the work around the work */
.ad-assume { margin-top: 36px; display: grid; grid-template-columns: 1fr 1fr 1.4fr; gap: 12px 32px; align-items: end; padding: 18px 20px; background: var(--film); border-radius: 4px; }
.ad-assume label { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; font-size: 15px; color: var(--lead); }
.ad-assume output { font-weight: 600; color: var(--graphite); font-variant-numeric: tabular-nums; }
.ad-assume input[type=range], .ad-progress input[type=range] { grid-column: 1 / -1; width: 100%; -webkit-appearance: none; appearance: none; background: transparent; height: 20px; cursor: pointer; }
.ad-assume p { font-size: 13.5px; color: var(--faint); line-height: 1.45; }
.ad-docs { margin-top: 28px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; align-items: start; }
.ad-col h3 { font-size: 23px; font-stretch: 108%; letter-spacing: -0.02em; }
.ad-src { display: flex; align-items: center; gap: 6px; margin: 6px 0 14px; font-size: 14px; color: var(--faint); font-stretch: 90%; }
.ad-src img { width: 18px; height: 18px; }
.doc { background: #fff; border: 1px solid var(--rule); border-radius: 2px; padding: 22px 22px 20px; box-shadow: 0 1px 0 rgba(0,0,0,.03), 0 18px 40px -18px rgba(20,24,28,.22); font-size: 13px; line-height: 1.45; color: var(--graphite); }
.doc-firm { font-size: 11px; font-weight: 600; letter-spacing: .02em; color: var(--faint); margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); }
.doc-title { font-size: 17px; font-weight: 640; font-stretch: 106%; letter-spacing: -0.015em; }
.doc-sub { color: var(--faint); margin-top: 2px; font-size: 12.5px; }
.doc-dl { margin: 14px 0 0; }
.doc-dl div { display: grid; grid-template-columns: 74px 1fr; gap: 8px; padding: 5px 0; border-top: 1px solid var(--rule); }
.doc-dl dt { color: var(--faint); }
.doc-dl dd { margin: 0; }
.doc-t { width: 100%; border-collapse: collapse; margin-top: 14px; font-variant-numeric: tabular-nums; }
.doc-t th { text-align: left; font-weight: 600; font-size: 11.5px; color: var(--faint); padding: 0 0 6px; border-bottom: 1px solid var(--rule-strong); }
.doc-t td { padding: 6px 0; border-bottom: 1px solid var(--rule); vertical-align: middle; }
.doc-t th:not(:first-child), .doc-t td:not(:first-child) { text-align: right; padding-left: 8px; white-space: nowrap; }
.doc-t.iv { font-size: 12px; }
.doc-t.iv td:first-child { font-size: 11.5px; padding-right: 4px; }
.doc-t.iv th:not(:first-child), .doc-t.iv td:not(:first-child) { padding-left: 6px; }
.doc-t.bl td:first-child { width: 30px; font-weight: 600; }
.doc-t.bl td:nth-child(2) { text-align: left; width: 100%; }
.bar { position: relative; display: block; height: 8px; background: var(--film); border-radius: 4px; }
.bar i { position: absolute; left: 0; top: 0; bottom: 0; background: var(--blue); border-radius: 4px; }
.bar b { position: absolute; top: -3px; width: 2px; height: 14px; background: var(--graphite); }
.doc-t.bl tr.over .bar i { background: #d8873a; }
.doc-flag { margin-top: 12px; padding: 9px 11px; background: var(--trace); border-radius: 2px; font-size: 12.5px; }
.doc-k { margin-top: 16px; font-weight: 600; font-size: 12px; }
.doc-thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 8px; }
.doc-thumbs span { aspect-ratio: 4 / 3; border-radius: 2px; background: linear-gradient(160deg, #d9dfe3 0 45%, #b9c2b4 45% 62%, #cfc8bb 62%); }
.doc-thumbs span:nth-child(2) { background: linear-gradient(170deg, #e5e1d8 0 40%, #a9a297 40% 70%, #d6d2c9 70%); }
.doc-thumbs span:nth-child(3) { background: linear-gradient(150deg, #cfd9df 0 50%, #8f8a80 50% 58%, #c7c9be 58%); }
.doc-note { margin-top: 8px; color: var(--faint); font-size: 12px; }
.ad-progress { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; }
.ad-progress label { display: grid; grid-template-columns: 1fr auto; font-size: 12.5px; color: var(--lead); }
.ad-progress output { font-variant-numeric: tabular-nums; color: var(--graphite); font-weight: 600; }
.ad-progress input[type=range] { height: 16px; }
.doc-sum { margin: 14px 0 0; font-variant-numeric: tabular-nums; }
.doc-sum div { display: flex; justify-content: space-between; padding: 4px 0; color: var(--lead); }
.doc-sum dd { margin: 0; }
.doc-sum .due { margin-top: 4px; padding-top: 8px; border-top: 2px solid var(--graphite); color: var(--graphite); font-weight: 650; font-size: 15px; }
.doc-status { margin-top: 14px; display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 600; padding: 6px 10px; border: 1px solid var(--rule-strong); border-radius: 999px; }
.doc-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #d8a23a; }

/* sections */
.sec { padding: clamp(96px, 12vw, 168px) 0; }
.sec-sheet { background: var(--sheet); }
.sec-dark { background: var(--graphite); color: var(--film); }
.sec-title { font-size: clamp(36px, 4.4vw, 60px); font-stretch: 112%; font-weight: 620; line-height: 1.02; letter-spacing: -0.035em; max-width: 16em; }
.sec-intro { margin-top: 20px; color: var(--lead); max-width: 36em; font-size: 20px; }

/* jobs */
.jobs { margin: clamp(48px, 6vw, 80px) 0 0; max-width: 1040px; }
.jobs div { display: grid; grid-template-columns: minmax(180px, 3fr) 7fr; gap: 24px; padding: 22px 0; border-top: 1px solid var(--rule); }
.jobs div:last-child { border-bottom: 1px solid var(--rule); }
.jobs dt { font-size: 23px; font-stretch: 108%; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
.jobs dd { margin: 0; color: var(--lead); max-width: 38em; }

/* how */
.how { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(40px, 6vw, 96px); align-items: start; }
.how-steps { list-style: none; margin: 48px 0 0; padding: 0; counter-reset: k; }
.how-steps li { counter-increment: k; position: relative; padding: 0 0 36px 64px; }
.how-steps li::before {
  content: counter(k); position: absolute; left: 0; top: -4px;
  width: 38px; height: 34px; display: grid; place-items: center;
  font-size: 15px; font-weight: 600; color: var(--graphite);
  background: var(--trace);
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}
.how-steps h3 { font-size: 23px; font-stretch: 108%; letter-spacing: -0.02em; margin-bottom: 8px; }
.how-steps p { color: var(--lead); }

.trace-fig { margin: 0; position: sticky; top: 120px; }
.trace-sheet { position: relative; background: var(--sheet); border: 1px solid var(--rule-strong); aspect-ratio: 4 / 3; overflow: hidden; }
.plan { position: absolute; inset: 0; width: 100%; height: 100%; }
.p-grid path { fill: none; stroke: var(--blue); stroke-width: 1; stroke-dasharray: 10 3 2 3; }
.p-wall path { fill: none; stroke: var(--graphite); stroke-width: 3; }
.p-thin path { fill: none; stroke: var(--graphite); stroke-width: 1; }
.p-dim path { fill: none; stroke: var(--lead); stroke-width: 1; }
.p-dim text { font: 500 11px var(--font); font-stretch: 80%; fill: var(--lead); }
.trace {
  position: absolute; inset: 18% 4% 4% 26%;
  background: rgba(242, 222, 106, 0.5);
  box-shadow: 0 10px 30px rgba(36,39,43,.12);
  transform: rotate(-1deg);
  transform-origin: 80% 0;
  transition: transform .7s cubic-bezier(.3,.7,.2,1), opacity .5s;
  mix-blend-mode: multiply;
}
.trace svg { position: absolute; left: -37.14%; top: -23.08%; width: 142.86%; height: 128.21%; transform: rotate(1deg); transform-origin: 85% 18%; overflow: visible; }
.t-x { fill: none; stroke: #3a3200; stroke-width: 1.4; }
.t-cloud { fill: none; stroke: #4b4100; stroke-width: 1.6; }
.t-new { fill: rgba(255,255,255,.35); stroke: #3a3200; stroke-width: 1.4; }
.t-arrow { fill: none; stroke: #3a3200; stroke-width: 1.6; stroke-linecap: round; }
.trace-note { position: absolute; left: 6%; bottom: 5%; max-width: 70%; font-size: 15px; font-style: italic; font-stretch: 84%; line-height: 1.35; color: #3a3200; }
.trace-sheet.lifted .trace { transform: translate(14%, -112%) rotate(-7deg); opacity: 0; }
.trace-actions { display: flex; align-items: center; gap: 16px; margin-top: 16px; flex-wrap: wrap; }
.trace-hint { font-size: 14px; color: var(--faint); font-stretch: 90%; }

/* software */
.harness { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 80px); align-items: center; }
.harness-text p { color: var(--lead); margin-top: 20px; max-width: 32em; }
.harness-fig svg { width: 100%; height: auto; display: block; overflow: visible; }
.legend { display: flex; gap: 24px; font-size: 14px; font-stretch: 85%; color: var(--lead); flex-wrap: wrap; }
.legend span { display: inline-flex; align-items: center; gap: 10px; }
.legend i { display: inline-block; width: 30px; border-top: 1.5px solid var(--graphite); }
.legend .lg-screen { border-top: 1.5px dashed var(--blue-ink); }
.h-ring { fill: none; stroke: var(--rule); stroke-width: 1; }
.h-link { fill: none; stroke: var(--graphite); stroke-width: 1.2; opacity: .5; transition: opacity .2s; }
.h-link.screen { stroke: var(--blue-ink); stroke-dasharray: 6 5; opacity: .9; }
.h-node rect { fill: var(--sheet); stroke: var(--graphite); stroke-width: 1; }
.h-node.screen rect { stroke: var(--blue-ink); stroke-dasharray: 3 2; }
.h-node text { font: 500 13px var(--font); font-stretch: 88%; fill: var(--graphite); }
.h-core circle { fill: var(--graphite); }
.h-core .g { fill: #fff; }
.h-core text { font: 650 21px var(--font); font-stretch: 108%; letter-spacing: -0.03em; fill: var(--sheet); }
.harness-fig svg.focus .h-link { opacity: .12; }
.harness-fig svg.focus .h-link.on { opacity: 1; }

/* memory */
.memory { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(24px, 5vw, 72px); align-items: center; }
.memory-text > p { color: var(--lead); margin-top: 20px; max-width: 30em; }
.memory-list { list-style: none; padding: 0; margin: 32px 0 0; }
.memory-list button {
  all: unset; box-sizing: border-box; cursor: pointer; width: 100%;
  display: block; padding: 10px 12px; margin-left: -12px;
  font-size: 18px; color: var(--lead); border-radius: 2px;
}
.memory-list button:hover { color: var(--graphite); }
.memory-list button.on { color: var(--graphite); background: var(--trace); }
.memory-list button:focus-visible { outline: 2px solid var(--blue-ink); }
.memory-q { margin-top: 28px; min-height: 112px; border-left: 3px solid var(--trace); padding-left: 18px; }
.memory-ask { font-size: 23px; font-stretch: 104%; font-weight: 560; letter-spacing: -0.015em; line-height: 1.25; }
.memory-sub { margin-top: 8px; color: var(--lead); font-size: 16px; }

.stack-wrap { height: clamp(420px, 50vw, 620px); display: grid; place-items: center; perspective: 2200px; perspective-origin: 50% 30%; }
.stack { position: relative; width: min(430px, 70vw); aspect-ratio: 1.3; transform-style: preserve-3d; transform: rotateX(58deg) rotateZ(-36deg); }
.sheet {
  position: absolute; inset: 0;
  background: rgba(255, 255, 255, .96);
  border: 1px solid var(--graphite);
  transition: transform .7s cubic-bezier(.2,.7,.2,1), background .3s, box-shadow .3s;
  cursor: pointer;
}
.sheet svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.sheet .s-ln { fill: none; stroke: var(--graphite); stroke-width: 1; vector-effect: non-scaling-stroke; }
.sheet .s-lt { fill: none; stroke: var(--faint); stroke-width: .8; vector-effect: non-scaling-stroke; }
.sheet .s-bl { fill: none; stroke: var(--blue); stroke-width: 1; vector-effect: non-scaling-stroke; }
.sheet .s-fill { fill: #e4e6e2; stroke: none; }
.sheet .s-ink { fill: var(--graphite); stroke: none; }
.sheet .s-tag { position: absolute; left: 10px; top: 8px; font-size: 11px; font-weight: 600; font-stretch: 80%; color: var(--lead); }
.sheet.on { background: rgba(247, 233, 150, .96); box-shadow: -24px 30px 50px rgba(36,39,43,.14); }
.sheet.on .s-tag { color: var(--graphite); }

/* envelope */
.env { margin-top: clamp(40px, 5vw, 64px); display: grid; grid-template-columns: minmax(0, 1fr) 300px; grid-template-rows: 1fr auto; grid-template-areas: "c f" "o f"; background: var(--sheet); border: 1px solid var(--rule-strong); }
.env-canvas-wrap { grid-area: c; position: relative; min-height: 540px; }
#env-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; }
#env-canvas:active { cursor: grabbing; }
.env-hint { position: absolute; left: 18px; top: 14px; color: var(--faint); font-size: 14px; font-stretch: 85%; pointer-events: none; }
.env-controls { grid-area: f; border-left: 1px solid var(--rule); padding: 8px 22px 18px; }
.env-controls fieldset { border: 0; padding: 0 0 10px; margin: 0; }
.env-controls legend { padding: 16px 0 4px; font-size: 15px; font-weight: 600; }
.env-controls label { display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 0 8px; padding: 4px 0; font-size: 15px; color: var(--lead); }
.env-controls output { font-size: 15px; font-variant-numeric: tabular-nums; color: var(--graphite); font-weight: 500; }
.env-controls input[type=range] { grid-column: 1 / -1; width: 100%; margin: 6px 0 2px; -webkit-appearance: none; appearance: none; background: transparent; height: 20px; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 2px; background: var(--rule); }
input[type=range]::-moz-range-track { height: 2px; background: var(--rule); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; margin-top: -7px; border-radius: 50%; background: var(--sheet); border: 2px solid var(--graphite); }
input[type=range]::-moz-range-thumb { width: 13px; height: 13px; border-radius: 50%; background: var(--sheet); border: 2px solid var(--graphite); }
input[type=range]:hover::-webkit-slider-thumb, input[type=range]:focus-visible::-webkit-slider-thumb { background: var(--trace); }
input[type=range]:focus-visible { outline: none; }
input[type=range]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(47,120,150,.25); }
.env-out { grid-area: o; margin: 0; display: grid; grid-template-columns: repeat(7, 1fr); border-top: 1px solid var(--rule); }
.env-out div { padding: 14px 16px 16px; border-right: 1px solid var(--rule); }
.env-out div:last-child { border-right: 0; }
.env-out dt { color: var(--faint); font-size: 13px; font-stretch: 85%; margin-bottom: 4px; }
.env-out dd { margin: 0; font-size: 17px; font-weight: 560; font-variant-numeric: tabular-nums; }
.env-limit { background: var(--trace); }
.env-limit dt { color: var(--trace-ink); }

/* visit */
.visit { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: clamp(40px, 6vw, 96px); align-items: end; }
.visit p { color: rgba(241,242,239,.75); margin-top: 22px; max-width: 32em; font-size: 20px; }
.terms { list-style: none; margin: 0; padding: 0; }
.terms li { position: relative; padding: 14px 0 14px 28px; border-top: 1px solid rgba(241,242,239,.16); color: var(--film); }
.terms li::before { content: ""; position: absolute; left: 0; top: 26px; width: 12px; height: 3px; background: var(--trace); }

/* footer */
.foot { background: var(--graphite); color: var(--film); padding: 0 0 48px; }
.foot-in { display: flex; gap: 28px 40px; align-items: center; flex-wrap: wrap; padding-top: 40px; border-top: 1px solid rgba(241,242,239,.16); }
.foot-post { font-weight: 600; text-decoration-color: var(--trace); text-underline-offset: 4px; text-decoration-thickness: 2px; }
.foot-note { margin-left: auto; color: rgba(241,242,239,.55); font-size: 14px; max-width: 30em; }

/* responsive */
@media (max-width: 1080px) {
  .ad-docs { grid-template-columns: 1fr; max-width: 560px; }
  .ad-assume { grid-template-columns: 1fr 1fr; }
  .ad-assume p { grid-column: 1 / -1; }
  .logos { grid-template-columns: repeat(3, 1fr); }
  .worklog { width: 280px; }
  .how, .harness, .memory, .visit { grid-template-columns: 1fr; }
  .trace-fig { position: relative; top: 0; }
  .env { grid-template-columns: 1fr; grid-template-rows: auto; grid-template-areas: "c" "o" "f"; }
  .env-controls { border-left: 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 32px; }
  .env-out { grid-template-columns: repeat(4, 1fr); }
  .env-out div { border-bottom: 1px solid var(--rule); }
}
@media (max-width: 760px) {
  body { font-size: 17px; }
  .ad-assume { grid-template-columns: 1fr; }
  .reading { top: 70px; left: 16px; right: 16px; width: auto; padding: 10px 12px; }
  .reading li { font-size: 12.5px; }
  .site-caption { display: none; }
  .sf-row { flex-direction: column; }
  .sf-row input { flex: none; }
  .worklog { display: none; }
  .logos { grid-template-columns: repeat(2, 1fr); }
  .nav { gap: 16px; }
  .stage-rail { display: none; }
  .step, .step-intro {
    justify-content: flex-end; padding: 96px var(--gutter) 40px; max-width: none;
    background: linear-gradient(0deg, var(--film) 0%, rgba(241,242,239,.96) 45%, rgba(241,242,239,0) 75%);
  }
  .lede { font-size: 18px; }
  .jobs div { grid-template-columns: 1fr; gap: 6px; }
  .stack-wrap { height: 360px; order: -1; }
  .env-canvas-wrap { min-height: 380px; }
  .env-controls { grid-template-columns: 1fr; }
  .env-out { grid-template-columns: 1fr 1fr; }
  .foot-note { margin-left: 0; }
}
@media (max-width: 480px) {
  .nav-links { display: none; }
  .nav .btn-small { margin-left: auto; }
}
@media (prefers-reduced-motion: reduce) {
  .rd-ic, .reading li { animation: none; }
  .trace, .sheet, .stage-rail li { transition: none; }
}