/* AssistIQ — an engineering spec sheet: paper and ink, a drafting grid, mono callouts, one blue. */
:root {
  --paper: #f6f4ee;
  --paper-2: #efece3;
  --card: #fffdf8;
  --ink: #15181d;
  --ink-2: #444a55;
  --faint: #7d838d;
  --rule: #d9d4c7;
  --grid: rgba(37, 83, 214, .055);
  --blue: #2553d6;
  --blue-ink: #ffffff;
  --warm: #a85d06;
  --ok: #0f8a58;
  --shadow: 0 1px 0 rgba(21,24,29,.04), 0 18px 40px -22px rgba(21,24,29,.35);
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --gutter: 16px;
  --max: 1160px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1216;
    --paper-2: #141820;
    --card: #171b22;
    --ink: #ece9e1;
    --ink-2: #b4b2ac;
    --faint: #7f838b;
    --rule: #2a2f38;
    --grid: rgba(110, 168, 254, .06);
    --blue: #6ea8fe;
    --blue-ink: #0b1220;
    --warm: #f0a437;
    --ok: #3ddc97;
    --shadow: 0 1px 0 rgba(0,0,0,.3), 0 22px 50px -24px rgba(0,0,0,.8);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
code { font-family: var(--mono); font-size: .88em; background: var(--paper-2); padding: .08em .35em; border-radius: 4px; border: 1px solid var(--rule); }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 720px) { :root { --gutter: 32px; } }

/* ---------- top ---------- */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.toprow { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.mark { font: 600 19px/1 var(--sans); letter-spacing: -.01em; text-decoration: none; }
.mark span { color: var(--blue); }
.mark.small { font-size: 16px; margin: 0; }
nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
nav a:not(.btn) { text-decoration: none; color: var(--ink-2); }
nav a:not(.btn):hover { color: var(--ink); }
@media (max-width: 640px) { nav a:not(.btn) { display: none; } }

.btn { display: inline-block; background: var(--blue); color: var(--blue-ink); text-decoration: none;
  font: 500 15px/1 var(--sans); padding: 14px 22px; border-radius: 3px; border: 1px solid transparent;
  box-shadow: 3px 3px 0 var(--ink); transition: transform .12s ease, box-shadow .12s ease; }
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn.small { padding: 9px 14px; font-size: 13.5px; box-shadow: 2px 2px 0 var(--ink); }
.btn.wide { display: block; text-align: center; }
.link { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.link:hover { color: var(--blue); }

/* ---------- hero ---------- */
.hero { display: grid; gap: 48px; padding-top: 72px; padding-bottom: 56px; align-items: center; }
@media (min-width: 960px) { .hero { grid-template-columns: 1.05fr .95fr; gap: 64px; padding-top: 96px; } }
.eyebrow { font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--blue); margin: 0 0 22px; }
h1 { font: 400 clamp(44px, 7vw, 82px)/.98 var(--serif); letter-spacing: -.015em; margin: 0 0 26px; text-wrap: balance; }
h1 em { white-space: nowrap; }
@media (max-width: 420px) { h1 em { white-space: normal; } }
h1 em { font-style: italic; color: var(--ink-2); }
.lede { font-size: 18.5px; color: var(--ink-2); max-width: 34em; margin: 0 0 32px; }
.cta { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.fine { font: 400 12.5px/1.4 var(--mono); color: var(--faint); margin: 22px 0 0; letter-spacing: .02em; }

/* the spec sheet: one field taken apart */
.spec { margin: 0; background: var(--card); border: 1px solid var(--ink); box-shadow: var(--shadow), 8px 8px 0 -1px var(--paper-2), 8px 8px 0 0 var(--rule);
  padding: 22px 24px 18px; position: relative; }
.spec::before, .spec::after { content: ""; position: absolute; width: 14px; height: 14px; border: 1px solid var(--blue); }
.spec::before { top: -8px; left: -8px; border-right: 0; border-bottom: 0; }
.spec::after { bottom: -8px; right: -8px; border-left: 0; border-top: 0; }
.spec-head { display: flex; justify-content: space-between; font: 500 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint);
  padding-bottom: 14px; border-bottom: 1px solid var(--rule); }
.spec-tag { color: var(--blue); }
.spec-id { font: 500 clamp(24px, 3.2vw, 32px)/1.1 var(--mono); margin: 20px 0 6px; letter-spacing: -.01em; overflow-wrap: anywhere; }
.spec-path { font: 400 14px/1 var(--mono); color: var(--blue); margin: 0 0 18px; }
.leaders { margin: 0; }
.leaders div { display: flex; align-items: baseline; gap: 10px; padding: 7px 0; font-size: 14.5px; }
.leaders dt { color: var(--ink-2); white-space: nowrap; }
.leaders div::after { content: none; }
.leaders dt::after { content: ""; }
.leaders dd { margin: 0 0 0 auto; font-family: var(--mono); font-size: 13.5px; text-align: right; overflow-wrap: anywhere; }
.leaders div > dt + dd { position: relative; }
.leaders div { background-image: radial-gradient(circle, var(--rule) 1px, transparent 1.4px); background-size: 6px 6px;
  background-repeat: repeat-x; background-position: 0 calc(100% - 11px); }
.leaders dt, .leaders dd { background: var(--card); padding: 0 6px; }
.leaders dt { padding-left: 0; }
.leaders dd { padding-right: 0; }
.leaders .warm { color: var(--warm); }
.leaders .ok { color: var(--ok); }
.spec figcaption { font-size: 12.5px; color: var(--faint); margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--rule); }

/* ---------- the panel, as a drawing sheet ---------- */
.sheet { padding-bottom: 32px; }
.frame { border: 1px solid var(--ink); background: var(--card); padding: 10px; box-shadow: var(--shadow); }
.frame img { border: 1px solid var(--rule); }
.titleblock { display: grid; grid-template-columns: auto 1fr auto; border: 1px solid var(--ink); border-top: 0; background: var(--card);
  font: 400 12px/1 var(--mono); color: var(--ink-2); text-transform: uppercase; letter-spacing: .08em; }
.titleblock span { padding: 12px 14px; }
.titleblock span + span { border-left: 1px solid var(--rule); }
.titleblock span:first-child { color: var(--blue); }
@media (max-width: 560px) { .titleblock { grid-template-columns: auto 1fr; } .titleblock span:last-child { display: none; } }

/* ---------- blocks ---------- */
.block { padding-top: 96px; padding-bottom: 24px; }
.block-head { display: grid; gap: 6px 32px; margin-bottom: 40px; max-width: 920px; }
@media (min-width: 860px) { .block-head { grid-template-columns: 72px 1fr; } .block-head .block-lede { grid-column: 2; } }
.num { font: 500 13px/1 var(--mono); color: var(--blue); margin: 10px 0 0; letter-spacing: .1em; }
h2 { font: 400 clamp(34px, 4.6vw, 52px)/1.04 var(--serif); margin: 0; letter-spacing: -.01em; text-wrap: balance; }
.block-lede { color: var(--ink-2); font-size: 17px; margin: 10px 0 0; max-width: 40em; }

.grid { display: grid; gap: 0; border-top: 1px solid var(--ink); }
@media (min-width: 720px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1040px) { .grid { grid-template-columns: 1fr 1fr 1fr; } }
.item { padding: 26px 24px 28px 0; border-bottom: 1px solid var(--rule); }
@media (min-width: 720px) { .item { padding-left: 24px; border-left: 1px solid var(--rule); } .item:nth-child(2n+1) { border-left: 0; padding-left: 0; } }
@media (min-width: 1040px) { .item:nth-child(2n+1) { border-left: 1px solid var(--rule); padding-left: 24px; } .item:nth-child(3n+1) { border-left: 0; padding-left: 0; } }
.item h3 { font: 600 16px/1.3 var(--sans); margin: 0 0 10px; }
.item h3::before { content: "→ "; color: var(--blue); font-family: var(--mono); font-weight: 400; }
.item p { margin: 0; color: var(--ink-2); font-size: 15px; }

.gallery { display: grid; gap: 28px; margin-top: 56px; }
@media (min-width: 760px) { .gallery { grid-template-columns: 1fr 1fr; } }
.gallery figure { margin: 0; }
.gallery a { display: block; border: 1px solid var(--ink); background: var(--card); padding: 6px; box-shadow: var(--shadow); transition: transform .18s ease; }
.gallery a:hover { transform: translateY(-3px); }
.gallery figcaption { font-size: 13.5px; color: var(--ink-2); margin-top: 10px; }
.gallery figcaption span { font: 500 11.5px/1 var(--mono); color: var(--blue); text-transform: uppercase; letter-spacing: .08em; margin-right: 8px; }

/* ---------- safety ---------- */
.diagram { display: grid; grid-template-columns: auto 1fr auto 1fr auto; align-items: center; gap: 0; margin: 0 0 44px;
  font: 500 14px/1 var(--mono); position: relative; padding-bottom: 54px; }
.node { border: 1px solid var(--ink); background: var(--card); padding: 14px 16px; white-space: nowrap; }
.node.accent { background: var(--blue); color: var(--blue-ink); border-color: var(--blue); }
.wire { height: 1px; background: var(--ink); position: relative; margin: 0 6px; min-width: 18px; }
.wire::after { content: ""; position: absolute; right: -1px; top: -4px; border: 4.5px solid transparent; border-left: 7px solid var(--ink); border-right: 0; }
.wire span { position: absolute; left: 50%; bottom: 8px; transform: translateX(-50%); font-size: 11.5px; font-weight: 400; color: var(--faint); white-space: nowrap; }
.drop { position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); font-size: 12px; color: var(--ink-2); font-weight: 400;
  border: 1px dashed var(--faint); padding: 8px 12px; background: var(--card); }
.drop::before { content: ""; position: absolute; left: 50%; top: -22px; height: 21px; border-left: 1px dashed var(--faint); }
@media (max-width: 640px) {
  .diagram { grid-template-columns: 1fr; justify-items: center; padding-bottom: 0; gap: 0; }
  .wire { width: 1px; height: 34px; margin: 0; min-width: 0; }
  .wire::after { right: -4px; top: auto; bottom: -1px; border: 4.5px solid transparent; border-top: 7px solid var(--ink); border-bottom: 0; }
  .wire span { left: 12px; bottom: 50%; transform: translateY(50%); }
  .drop { position: static; transform: none; margin-top: 30px; }
  .drop::before { display: none; }
}

.facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--ink); }
@media (min-width: 820px) { .facts { grid-template-columns: 1fr 1fr; column-gap: 48px; } }
.facts li { padding: 18px 0 18px 30px; border-bottom: 1px solid var(--rule); position: relative; color: var(--ink-2); font-size: 15.5px; }
.facts li::before { content: "✓"; position: absolute; left: 2px; top: 18px; color: var(--ok); font-family: var(--mono); }
.facts b { color: var(--ink); font-weight: 600; }

/* ---------- setup ---------- */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 20px; }
@media (min-width: 960px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { counter-increment: step; background: var(--card); border: 1px solid var(--rule); border-top: 2px solid var(--ink); padding: 22px 22px 20px; min-width: 0; }
.steps li::before { content: "Step " counter(step); font: 500 11.5px/1 var(--mono); color: var(--blue); text-transform: uppercase; letter-spacing: .1em; }
.steps h3 { font: 600 17px/1.3 var(--sans); margin: 10px 0 8px; }
.steps p { margin: 0 0 14px; color: var(--ink-2); font-size: 15px; }
pre { margin: 0; background: var(--paper-2); border: 1px solid var(--rule); padding: 12px 14px; overflow-x: auto; font: 400 12.5px/1.7 var(--mono); }
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
pre .c { color: var(--faint); }

.req { margin: 40px 0 0; display: grid; border-top: 1px solid var(--ink); }
@media (min-width: 720px) { .req { grid-template-columns: repeat(4, 1fr); } }
.req div { padding: 16px 16px 16px 0; border-bottom: 1px solid var(--rule); }
.req dt { font: 500 11.5px/1 var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 8px; }
.req dd { margin: 0; font-size: 15px; }

/* ---------- download ---------- */
.dl { display: grid; gap: 36px; align-items: center; border: 1px solid var(--ink); background: var(--card); padding: 36px 28px; box-shadow: var(--shadow); }
@media (min-width: 860px) { .dl { grid-template-columns: 1.1fr .9fr; padding: 48px; } }
.dl .num { margin-bottom: 14px; }
.dl-card { border: 1px dashed var(--faint); padding: 24px; background: var(--paper); }
.dl-name { font: 600 18px/1.2 var(--sans); margin: 0 0 4px; }
.dl-meta { font: 400 12.5px/1.4 var(--mono); color: var(--faint); margin: 0 0 20px; }
.dl-note { font-size: 13px; color: var(--ink-2); margin: 16px 0 0; }

/* ---------- footer ---------- */
.foot { margin-top: 96px; border-top: 1px solid var(--ink); background: var(--paper-2); }
.footrow { display: grid; gap: 14px; padding-top: 28px; padding-bottom: 36px; }
@media (min-width: 860px) { .footrow { grid-template-columns: auto 1fr; gap: 48px; align-items: start; } }
.by { color: var(--faint); font-weight: 400; font-size: 13px; margin-left: 6px; }
.legal { margin: 0; font-size: 12.5px; color: var(--faint); max-width: 62em; }

/* ---------- one reveal on load ---------- */
.rise { opacity: 0; transform: translateY(14px); animation: rise .7s cubic-bezier(.2,.7,.2,1) forwards; animation-delay: calc(var(--d, 0) * 110ms + 80ms); }
@keyframes rise { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .rise { animation: none; opacity: 1; transform: none; } html { scroll-behavior: auto; } }

/* narrow screens: each value under its label, no leader dots to wrap around */
@media (max-width: 480px) {
  .leaders div { display: block; background: none; padding: 8px 0; border-bottom: 1px dotted var(--rule); }
  .leaders dt, .leaders dd { padding: 0; background: none; }
  .leaders dt { font-size: 12.5px; color: var(--faint); }
  .leaders dd { text-align: left; margin: 2px 0 0; }
}