/* Blueprint: a drafting sheet that descends through abstraction levels. Single deliberate look (navy sheet, cyan linework, redline markup). */
:root {
  --bg: #0b2647;
  --bg-deep: #071a33;
  --surface: rgba(12, 42, 80, .82);
  --surface-solid: #0c2a50;
  --ink: #eaf3ff;
  --muted: #8eb0d8;
  --line: rgba(150, 200, 255, .2);
  --line-strong: rgba(150, 210, 255, .45);
  --accent: #6fdcff;
  --accent-soft: rgba(111, 220, 255, .12);
  --warm: #ff8a3d;
  --s1: #2b95dc;
  --s2: #e0661f;
  --s0: #4d6f99;
  --grid: rgba(150, 200, 255, .12);
  --grid-minor: rgba(150, 200, 255, .055);
  --grid-major: rgba(150, 200, 255, .11);
  --f-display: "Archivo", "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Geist", "Segoe UI", system-ui, sans-serif;
  --f-mono: "Geist Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --r: 3px;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 var(--f-body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }
code, .mono { font-family: var(--f-mono); font-size: .86em; }
code { background: var(--accent-soft); padding: .05em .35em; border-radius: 4px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.muted { color: var(--muted); }

main {
  max-width: 1080px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
@media (min-width: 1240px) { main { padding-left: 200px; max-width: 1280px; } }

/* depth rail */
.rail { display: none; }
@media (min-width: 1240px) {
  .rail {
    display: block; position: fixed; left: max(24px, env(safe-area-inset-left, 0px)); top: 50%;
    transform: translateY(-50%); z-index: 5; font: 500 12px/1.2 var(--f-mono);
  }
  .rail-cap { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; margin: 0 0 14px; }
  .rail ol { list-style: none; margin: 0; padding: 0; position: relative; display: grid; gap: 18px; }
  .rail ol::before { content: ""; position: absolute; left: 4px; top: 6px; bottom: 6px; width: 1px; background: var(--line); }
  .rail a { display: flex; align-items: center; gap: 12px; color: var(--muted); text-decoration: none; }
  .rail i { width: 9px; height: 9px; border-radius: 50%; background: var(--bg); border: 1px solid var(--muted); position: relative; transition: transform .25s, background .25s; }
  .rail li.on a { color: var(--ink); }
  .rail li.on i { background: var(--accent); border-color: var(--accent); transform: scale(1.35); }
  .rail li.past i { background: var(--muted); }
}

/* sections */
.sec { padding-block: 72px; border-top: 1px solid var(--line); }
.sec-head { max-width: 680px; margin-bottom: 36px; }
.sec-head p:last-child { color: var(--muted); margin: 0; }
.lvl { font: 500 12px/1 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
h1, h2, h3 { font-family: var(--f-display); text-wrap: balance; margin: 0; }
h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.1; font-weight: 600; letter-spacing: -.02em; margin-bottom: 12px; }
h3 { font-size: 19px; line-height: 1.25; font-weight: 600; }
.sub { margin: 56px 0 20px; font-size: 22px; }

/* hero */
.hero { border-top: 0; padding-block: 88px 64px; }
.eyebrow { font: 500 13px/1 var(--f-mono); color: var(--muted); letter-spacing: .06em; margin: 0 0 28px; }
.hero h1 {
  font-size: clamp(42px, 8vw, 92px); line-height: .98; font-weight: 800; letter-spacing: -.035em;
  font-variation-settings: "opsz" 96; max-width: 12ch;
}
.lede { font-size: clamp(18px, 2.1vw, 21px); max-width: 60ch; color: var(--muted); margin: 28px 0 40px; }

.stream { margin: 0 0 44px; max-width: 720px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.stream-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 10px 16px; border-bottom: 1px solid var(--line); font: 12px/1.4 var(--f-mono); color: var(--muted); }
.stream-meter { margin-left: auto; font-variant-numeric: tabular-nums; }
.stream-meter b { color: var(--ink); font-weight: 500; }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .25; } }
.stream-text { margin: 0; padding: 18px 16px 20px; font: 17px/1.6 var(--f-mono); min-height: 7.2em; }
.stream-text .tk { animation: tk .35s ease-out; border-radius: 3px; }
@keyframes tk { from { background: var(--accent-soft); } }
.stream-text .caret { display: inline-block; width: .55em; height: 1.05em; background: var(--accent); vertical-align: -0.15em; margin-left: 2px; animation: pulse 1s steps(1) infinite; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin: 0; max-width: 820px; border-top: 1px solid var(--line); }
.stats div { padding: 18px 16px 0 0; }
.stats dt { font: 12px/1.3 var(--f-mono); color: var(--muted); order: 2; }
.stats dd { margin: 0 0 4px; font: 600 clamp(32px, 4.5vw, 46px)/1 var(--f-display); letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.stats div { display: flex; flex-direction: column-reverse; justify-content: flex-end; }
.stats small { font-size: .5em; color: var(--muted); margin-left: 2px; }
@media (max-width: 620px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 8px; } }
.scrollhint { margin: 40px 0 0; font-size: 14px; color: var(--muted); }

.chip {
  font: 500 14px/1 var(--f-body); color: var(--muted); background: transparent; border: 1px solid transparent;
  padding: 9px 14px; border-radius: 7px; cursor: pointer; white-space: nowrap;
}
.chip:hover { color: var(--ink); background: var(--bg); }

/* gallery */
.gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.gallery figure { margin: 0; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.gallery img { border-radius: 8px; width: 100%; }
.gallery figcaption { font-size: 14px; color: var(--muted); }
.gallery figcaption b { color: var(--ink); font-weight: 600; }
.g-wide, .g-pair, .g-crop { grid-column: span 2; }
.g-crop img { aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; border: 1px solid var(--line); }
.g-full { grid-column: 1 / -1; }
.g-full img { border: 1px solid var(--line); }
.g-pair .pair { flex: 1; }
@media (max-width: 820px) { .gallery { grid-template-columns: minmax(0, 1fr); } .g-wide, .g-pair, .g-crop, .g-full { grid-column: auto; } }
.pair { display: grid; grid-template-columns: minmax(0, .62fr) auto minmax(0, 1fr); align-items: center; gap: 10px; background: #000; border-radius: 8px; padding: 10px; }
.pair img { border-radius: 4px; }
.pair-arrow { color: #fff; font: 600 22px var(--f-display); }
.pixel { image-rendering: pixelated; }

/* cards */
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.chip { border-color: var(--line); background: var(--surface); }
.chip.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 900px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .cards { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; display: flex; flex-direction: column; transition: transform .2s, border-color .2s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card canvas { width: 100%; height: 110px; display: block; background: var(--bg); border-bottom: 1px solid var(--line); }
.card-body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card h3 { font-size: 18px; }
.card p { margin: 0; font-size: 15px; color: var(--muted); }
.card .fact { font: 12px/1.4 var(--f-mono); color: var(--ink); margin-top: auto; padding-top: 6px; }
.tags { display: flex; flex-wrap: wrap; gap: 4px; }
.tags span { font: 11px/1 var(--f-mono); padding: 4px 6px; border-radius: 4px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.card[hidden] { display: none; }
.card-link { font: 500 13px var(--f-mono); text-decoration: none; }
.card-link:hover { text-decoration: underline; }
.card .fact { margin-top: auto; }
.lab { margin-top: 32px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.lab > p { margin: 6px 0 16px; font-size: 14px; color: var(--muted); max-width: 70ch; }
.lab-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 900px) { .lab-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .lab-grid { grid-template-columns: minmax(0, 1fr); } }
.lab-item { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: var(--bg); display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.lab-item b { font: 600 15px var(--f-display); }
.lab-item span { font: 12px/1.45 var(--f-mono); color: var(--muted); }

/* flows */
.flow-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 24px; margin-bottom: 16px; }
.flow-card > p { max-width: 70ch; margin: 8px 0 20px; font-size: 15px; }
.flow { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 24px 22px; }
.flow li {
  position: relative; flex: 1 1 0; min-width: 88px; padding: 12px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); display: flex; flex-direction: column; gap: 4px;
}
.flow li b { font: 600 15px/1.2 var(--f-display); }
.flow li span { font: 12px/1.4 var(--f-mono); color: var(--muted); }
.flow li:not(:last-child)::after {
  content: ""; position: absolute; right: -18px; top: 50%; width: 14px; height: 2px;
  background: linear-gradient(90deg, var(--line), var(--accent));
}
.flow li.hot { border-color: var(--accent); background: var(--accent-soft); }
.flow li { animation: none; }
.flow.flowing li::before {
  content: ""; position: absolute; inset: -1px; border-radius: 8px; border: 1px solid var(--accent); opacity: 0;
  animation: lit 3.6s calc(var(--i) * .45s) infinite;
}
@keyframes lit { 0%, 30%, 100% { opacity: 0; } 8%, 18% { opacity: 1; } }
@media (max-width: 620px) {
  .flow { flex-direction: column; gap: 18px; }
  .flow li:not(:last-child)::after { right: auto; left: 22px; top: auto; bottom: -15px; width: 2px; height: 12px; }
}

/* forks */
.diffchart, .panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; margin-bottom: 16px; min-width: 0; }
.charttitle { font-size: 16px; margin-bottom: 4px; }
.chartsub { margin: 0 0 12px; font-size: 13px; color: var(--muted); }
.forks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-bottom: 16px; }
@media (max-width: 760px) { .forks { grid-template-columns: minmax(0, 1fr); } }
.fork { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; min-width: 0; }
.fork header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px; margin-bottom: 10px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.fork header .mono { color: var(--muted); font-size: 12px; }
.fork ul { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 14.5px; }
.fork li::marker { color: var(--accent); }
.explain { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.explain figcaption { font-size: 14px; color: var(--muted); max-width: 75ch; margin-top: 12px; }
.moe { margin-top: 12px; }
.moe svg, .chart svg, #diffbars svg { display: block; width: 100%; overflow: visible; }

/* diff bars */
.drow { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 12px; align-items: center; padding: 6px 0; font-size: 14px; }
.drow b { font-family: var(--f-display); font-weight: 600; }
.dtrack { display: flex; align-items: center; gap: 2px; min-width: 0; }
.dadd, .ddel { height: 14px; border-radius: 0 4px 4px 0; transform-origin: left; }
.dadd { background: var(--s1); }
.ddel { background: var(--s2); border-radius: 0 4px 4px 0; }
.dnum { font: 12px var(--f-mono); color: var(--muted); margin-left: 8px; white-space: nowrap; font-variant-numeric: tabular-nums; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; font-size: 12px; color: var(--muted); margin-top: 8px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; }
@media (max-width: 520px) { .drow { grid-template-columns: minmax(0, 1fr); gap: 4px; } }

/* bench */
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid2 .panel { margin-bottom: 0; }
.grid2 + .panel { margin-top: 16px; }
@media (max-width: 820px) { .grid2 { grid-template-columns: minmax(0, 1fr); } }
.chart { height: 250px; position: relative; }
.chart.short { height: 210px; }
.dumb { display: grid; gap: 2px; }
.drow2 { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 2fr) 92px; gap: 14px; align-items: center; padding: 8px 0; border-top: 1px solid var(--grid); font-size: 14px; }
.drow2:first-child { border-top: 0; }
.drow2 .what b { display: block; font-weight: 600; }
.drow2 .what span { color: var(--muted); font-size: 12px; font-family: var(--f-mono); }
.dbar { position: relative; height: 14px; }
.dbar .was { position: absolute; inset: 0; border-radius: 0 4px 4px 0; background: var(--grid); }
.dbar .now { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 0 4px 4px 0; background: var(--s1); transition: width 1s cubic-bezier(.2,.7,.2,1); }
.drow2 .gain { font: 600 18px/1 var(--f-display); text-align: right; font-variant-numeric: tabular-nums; }
.drow2 .gain small { display: block; font: 11px var(--f-mono); color: var(--muted); margin-top: 3px; }
@media (max-width: 620px) {
  .drow2 { grid-template-columns: minmax(0, 1fr) 80px; }
  .drow2 .dbar { grid-column: 1 / -1; order: 3; }
}

.statusbar { display: flex; gap: 2px; height: 28px; margin: 12px 0; }
.statusbar div { border-radius: 4px; display: flex; align-items: center; padding-left: 8px; font: 500 12px var(--f-mono); color: #fff; overflow: hidden; white-space: nowrap; min-width: 0; }

/* tooltip */
.tip {
  position: fixed; z-index: 20; pointer-events: none; background: var(--ink); color: var(--bg);
  padding: 8px 10px; border-radius: 6px; font: 12px/1.45 var(--f-body); max-width: 240px;
  box-shadow: 0 6px 24px rgba(0,0,0,.18);
}
.tip b { font: 600 15px/1.2 var(--f-display); display: block; }

/* svg text */
svg text { font-family: var(--f-mono); font-size: 11px; fill: var(--muted); }
svg .lbl { fill: var(--ink); font-family: var(--f-body); font-size: 12px; }
svg .hit { fill: transparent; cursor: pointer; }

.foot { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px; padding-block: 56px 72px; border-top: 1px solid var(--line); }
.foot-big { font: 700 28px/1.1 var(--f-display); margin: 0 0 6px; }
.foot p { margin: 0; }
.btn { font: 500 15px var(--f-mono); padding: 12px 18px; border: 1px solid var(--ink); border-radius: 8px; color: var(--ink); text-decoration: none; }
.btn:hover { background: var(--ink); color: var(--bg); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}
.forks .fork:last-child:nth-child(odd) { grid-column: 1 / -1; }
.foot-links { display: flex; flex-wrap: wrap; gap: 10px; }
.eyebrow a { color: var(--muted); text-underline-offset: 3px; }
.eyebrow a:hover { color: var(--accent); }

/* card detail layer */
.card { position: relative; cursor: pointer; }
.more-hint { font: 11px var(--f-mono); color: var(--accent); }
.card-more {
  position: absolute; inset: 0; z-index: 2; background: var(--surface); padding: 14px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 8px;
  opacity: 0; visibility: hidden; transform: translateY(6px); transition: opacity .2s, transform .2s, visibility 0s .2s;
}
.card:hover .card-more, .card:focus-within .card-more, .card.open .card-more {
  opacity: 1; visibility: visible; transform: none; transition: opacity .2s, transform .2s;
}
.card-more img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; object-position: top left; border-radius: 6px; border: 1px solid var(--line); flex: none; }
.card-more h4 { margin: 2px 0 0; font: 600 12px var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.card-more ul { margin: 0; padding-left: 16px; display: grid; gap: 6px; font-size: 13px; line-height: 1.45; }
.card-more li::marker { color: var(--accent); }
@media (hover: none) { .card:hover:not(.open) .card-more { opacity: 0; visibility: hidden; } }
.card { overflow: visible; }
.card canvas { border-radius: var(--r) var(--r) 0 0; }
.card:hover, .card:focus-within, .card.open { z-index: 6; }
.card-more {
  inset: auto; top: -6px; left: -6px; right: -6px; min-height: calc(100% + 12px); overflow: visible;
  border: 1px solid var(--accent); border-radius: var(--r); box-shadow: 0 18px 48px rgba(0, 0, 0, .35);
}

.hero h1 { max-width: 14ch; }
.hero h1 em { font-style: normal; color: var(--accent); }
.streams { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 0 0 44px; max-width: 980px; }
.streams .stream { margin: 0; max-width: none; min-width: 0; }
.stream-head b { color: var(--ink); font-weight: 500; }
.streams .stream-text { font-size: 15px; min-height: 8.4em; }
@media (max-width: 720px) { .streams { grid-template-columns: minmax(0, 1fr); } }

/* chat assistant */
.chat-fab {
  position: fixed; z-index: 20; display: inline-flex; align-items: center; gap: 10px;
  right: max(16px, env(safe-area-inset-right, 0px)); bottom: max(16px, env(safe-area-inset-bottom, 0px));
  font: 500 14px/1 var(--f-body); color: var(--surface); background: var(--ink);
  border: 0; border-radius: 999px; padding: 13px 18px; cursor: pointer;
  box-shadow: 0 8px 24px rgb(0 0 0 / .18); transition: transform .2s;
}
.chat-fab:hover { transform: translateY(-2px); }
.chat-fab[aria-expanded="true"] { display: none; }
.chat {
  position: fixed; z-index: 21; display: flex; flex-direction: column;
  right: max(16px, env(safe-area-inset-right, 0px)); bottom: max(16px, env(safe-area-inset-bottom, 0px));
  width: min(400px, calc(100vw - 32px)); height: min(600px, calc(100dvh - 32px));
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: 0 18px 48px rgb(0 0 0 / .22); overflow: hidden;
}
.chat[hidden] { display: none; }
.chat-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.chat-head b { display: block; font: 600 16px/1.2 var(--f-display); }
.chat-head .mono { font-size: 11px; color: var(--muted); }
.chat-x { border: 0; background: none; color: var(--muted); font-size: 24px; line-height: 1; cursor: pointer; padding: 4px 8px; border-radius: 6px; }
.chat-x:hover { background: var(--bg); color: var(--ink); }
.chat-log { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; overscroll-behavior: contain; }
.msg { margin: 0; max-width: 88%; padding: 10px 13px; border-radius: 12px; font-size: 14.5px; line-height: 1.55; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 4px; white-space: pre-wrap; }
.msg.bot { align-self: flex-start; background: var(--bg); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.bot p { margin: 0 0 .5em; } .msg.bot p:last-child { margin: 0; }
.msg.bot ul { margin: .2em 0 .5em; padding-left: 1.2em; }
.msg.err { color: var(--warm); }
.msg.wait::after { content: "…"; animation: pulse 1.2s infinite; }
.msg-meta { align-self: flex-start; margin-top: -6px; font: 11px/1.4 var(--f-mono); color: var(--muted); max-width: 88%; }
.chat-sugg { display: flex; flex-wrap: wrap; gap: 6px; }
.chat-sugg button {
  font: 13px/1.3 var(--f-body); text-align: left; color: var(--accent); background: var(--accent-soft);
  border: 1px solid transparent; border-radius: 999px; padding: 7px 12px; cursor: pointer;
}
.chat-sugg button:hover { border-color: var(--accent); }
.chat-form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); }
.chat-form input {
  flex: 1; min-width: 0; font: 15px/1.4 var(--f-body); color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
.chat-form input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.chat-form button { border: 0; border-radius: 10px; width: 44px; font-size: 18px; color: #fff; background: var(--accent); cursor: pointer; }
.chat-form button:disabled { opacity: .5; cursor: default; }
@media (max-width: 520px) {
  .chat { right: 0; bottom: 0; width: 100vw; height: 88dvh; border-radius: 14px 14px 0 0; padding-bottom: env(safe-area-inset-bottom, 0px); }
}

/* ================= blueprint layer ================= */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(120% 80% at 50% 0%, transparent 40%, var(--bg-deep) 100%),
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size: 100% 100%, 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  background-attachment: fixed;
}
/* paper grain */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 40; pointer-events: none; opacity: .09; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection { background: var(--accent); color: var(--bg-deep); }
code { background: var(--accent-soft); color: var(--accent); }

/* registration-mark corners on every drawn panel */
.card, .panel, .fork, .flow-card, .diffchart, .explain, .lab, .stream, .chat {
  --c: var(--line-strong);
  background-image:
    linear-gradient(var(--c), var(--c)), linear-gradient(var(--c), var(--c)),
    linear-gradient(var(--c), var(--c)), linear-gradient(var(--c), var(--c)),
    linear-gradient(var(--c), var(--c)), linear-gradient(var(--c), var(--c)),
    linear-gradient(var(--c), var(--c)), linear-gradient(var(--c), var(--c));
  background-size: 14px 1px, 1px 14px, 14px 1px, 1px 14px, 14px 1px, 1px 14px, 14px 1px, 1px 14px;
  background-position: -1px -1px, -1px -1px, calc(100% + 1px) -1px, calc(100% + 1px) -1px, -1px calc(100% + 1px), -1px calc(100% + 1px), calc(100% + 1px) calc(100% + 1px), calc(100% + 1px) calc(100% + 1px);
  background-repeat: no-repeat;
  background-color: var(--surface);
  backdrop-filter: blur(2px);
}
.card:hover { --c: var(--accent); }

/* section heads: sheet stamp + oversized drafted titles */
.sec { border-top: 1px dashed var(--line); padding-block: 110px; position: relative; }
.sec::before {
  content: attr(data-sheet); position: absolute; top: -9px; right: 0;
  font: 500 11px/1 var(--f-mono); letter-spacing: .14em; color: var(--muted);
  background: var(--bg); padding: 2px 8px; border: 1px solid var(--line);
}
.sec-head { max-width: 900px; margin-bottom: 52px; }
.lvl { display: inline-flex; align-items: center; gap: 10px; color: var(--accent); }
.lvl::before { content: ""; width: 28px; height: 1px; background: var(--accent); }
h2 {
  font-size: clamp(38px, 6.4vw, 84px); line-height: .98; font-weight: 800; letter-spacing: -.03em;
  font-stretch: 112%; font-variation-settings: "wdth" 112; margin-bottom: 18px;
}
h3 { font-variation-settings: "wdth" 104; }
.sec-head p:last-child { font-size: 18px; max-width: 62ch; }

/* word-by-word reveal for big headings */
.split .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .08em; margin-bottom: -.08em; }
.split .w > span { display: inline-block; transform: translateY(105%); transition: transform .9s cubic-bezier(.2, .8, .1, 1); transition-delay: calc(var(--i) * 55ms); }
.split.in .w > span { transform: none; }
/* generic fade-up */
.rv { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .9s cubic-bezier(.2, .8, .1, 1); transition-delay: calc(var(--d, 0) * 70ms); }
.rv.in { opacity: 1; transform: none; }

/* ---------- intro: zoom through the drafted laptop ---------- */
.intro { position: relative; height: 270vh; }
.intro + main { position: relative; z-index: 1; margin-top: -98vh; }
.intro-stage { position: sticky; top: 0; height: 100vh; height: 100dvh; overflow: hidden; display: grid; place-items: center; }
.intro-svg { width: min(1180px, 96vw); max-height: 88vh; overflow: visible; will-change: transform; transform-origin: 0 0; }
.intro-svg .ln { fill: none; stroke: var(--accent); stroke-width: 1.4; vector-effect: non-scaling-stroke; stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 2.2s cubic-bezier(.6, .1, .2, 1) forwards; animation-delay: calc(var(--i, 0) * 120ms); }
.intro-svg .thin { stroke-width: .8; stroke: var(--line-strong); }
.intro-svg .dash { stroke-dasharray: 4 5; stroke-dashoffset: 0; animation: fadein 1s 1.2s both; stroke: var(--line-strong); }
.intro-svg .red { stroke: var(--warm); }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fadein { from { opacity: 0; } }
.intro-svg text { font-family: var(--f-mono); fill: var(--muted); font-size: 12px; letter-spacing: .06em; animation: fadein .8s 1.4s both; }
.intro-svg text.big { fill: var(--ink); font-size: 15px; }
.intro-svg text.hot { fill: var(--warm); }
.intro-svg .scr { fill: var(--bg-deep); stroke: var(--accent); stroke-width: 1.4; vector-effect: non-scaling-stroke; }
.intro-svg .term { font-size: 13px; fill: var(--accent); letter-spacing: 0; }
.intro-svg .callouts { transition: opacity .2s linear; }
.intro-title {
  position: absolute; left: max(16px, env(safe-area-inset-left, 0px)); bottom: max(28px, env(safe-area-inset-bottom, 0px));
  margin: 0; font: 500 12px/1.6 var(--f-mono); color: var(--muted); letter-spacing: .12em; text-transform: uppercase;
}
.intro-title b { color: var(--ink); font-weight: 500; }
.intro-skip {
  position: absolute; top: max(18px, env(safe-area-inset-top, 0px)); left: 50%; transform: translateX(-50%);
  font: 500 11px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink);
  background: var(--bg-deep); border: 1px solid var(--line-strong); padding: 9px 14px; cursor: pointer; text-decoration: none;
}
.intro-skip:hover { border-color: var(--accent); color: var(--accent); }
.intro-cue {
  position: absolute; right: max(16px, env(safe-area-inset-right, 0px)); bottom: max(28px, env(safe-area-inset-bottom, 0px));
  font: 500 11px/1 var(--f-mono); letter-spacing: .14em; color: var(--muted); display: flex; align-items: center; gap: 10px; text-transform: uppercase;
}
.intro-cue i { width: 1px; height: 38px; background: linear-gradient(var(--accent), transparent); animation: cue 1.6s ease-in-out infinite; transform-origin: top; }
@keyframes cue { 0% { transform: scaleY(0); } 60% { transform: scaleY(1); opacity: 1; } 100% { opacity: 0; } }
body.in-intro .rail, body.in-intro .chat-fab { opacity: 0; pointer-events: none; }
.rail, .chat-fab { transition: opacity .4s; }

/* ---------- hero ---------- */
.hero { padding-block: 120px 90px; position: relative; }
.drift { translate: -50% 0; }
.hero::before { content: none; }
.hero h1 {
  font-size: clamp(50px, 10.5vw, 158px); line-height: .9; font-weight: 850; letter-spacing: -.045em;
  font-variation-settings: "wdth" 118; font-stretch: 118%; max-width: 11ch;
}
.hero h1 em { color: var(--accent); position: relative; }
.hero h1 em::after {
  content: ""; position: absolute; left: -.06em; right: -.06em; bottom: .02em; height: .09em; background: var(--warm);
  transform: scaleX(0); transform-origin: left; animation: redline .9s 1.1s cubic-bezier(.6, .1, .2, 1) forwards; border-radius: 2px;
}
@keyframes redline { to { transform: scaleX(1); } }
.dimline { display: flex; align-items: center; gap: 10px; max-width: 520px; margin: 0 0 34px; font: 500 11px/1 var(--f-mono); color: var(--muted); letter-spacing: .14em; text-transform: uppercase; }
.dimline::before, .dimline::after { content: ""; flex: 1; height: 9px; border: solid var(--line-strong); border-width: 0 1px; background: linear-gradient(var(--line-strong), var(--line-strong)) center / 100% 1px no-repeat; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 12px; }
.stats { border-top: 1px dashed var(--line-strong); max-width: 980px; }
.stats dd { font-size: clamp(38px, 5.4vw, 64px); font-weight: 800; font-variation-settings: "wdth" 112; color: var(--ink); }
.stats dt { text-transform: uppercase; letter-spacing: .08em; font-size: 11px; }

/* drifting schematic parts (the collage cut-outs, drafted) */
.drift { position: absolute; z-index: 0; pointer-events: none; color: var(--accent); opacity: .55; will-change: transform; }
.drift svg { display: block; width: 100%; height: auto; overflow: visible; }
.drift svg * { vector-effect: non-scaling-stroke; }
.drift.w { color: var(--warm); opacity: .6; }
.drift-in { animation: bob 7s ease-in-out infinite; animation-delay: var(--dl, 0s); }
@keyframes bob { 50% { transform: translateY(-14px) rotate(4deg); } }
.hero > *:not(.drift) { position: relative; z-index: 1; }
@media (max-width: 760px) { .drift { opacity: .3; } }

/* figures as drafted plates */
.gallery figure { position: relative; }
.gallery img, .g-crop img, .g-full img { border: 1px solid var(--line-strong); border-radius: 2px; box-shadow: 0 0 0 6px rgba(7, 26, 51, .55), 0 0 0 7px var(--line); }
.gallery figcaption { font-size: 14px; }
.gallery figcaption::before { content: "FIG. " counter(fig, decimal-leading-zero) " — "; counter-increment: fig; font: 500 11px var(--f-mono); color: var(--accent); letter-spacing: .1em; }
.gallery { counter-reset: fig; gap: 34px 26px; }

/* chips, buttons, tags in drafting style */
.chip { border-radius: 2px; font-family: var(--f-mono); font-size: 13px; }
.chip.on { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }
.tags span { border-radius: 2px; background: transparent; border-color: var(--line-strong); }
.btn { border-radius: 2px; border-color: var(--accent); color: var(--accent); }
.btn:hover { background: var(--accent); color: var(--bg-deep); }
.card-more { background: var(--surface-solid); border-radius: var(--r); }
.card canvas { background: rgba(7, 26, 51, .6); }
.flow li, .lab-item { background: rgba(7, 26, 51, .55); border-radius: 2px; }
.flow li.hot { background: var(--accent-soft); }
.pair { border-radius: 2px; }
.tip { background: var(--ink); color: var(--bg-deep); border-radius: 2px; }

/* footer as an engineering title block */
.foot { display: block; padding-block: 80px 110px; border-top: 1px dashed var(--line); }
.tblock { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; border: 1px solid var(--line-strong); }
.tblock > div { border: solid var(--line); border-width: 0 1px 1px 0; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.tblock > div:nth-child(4n) { border-right: 0; }
.tblock > div:nth-last-child(-n+4) { border-bottom: 0; }
.tblock small { font: 500 10px/1 var(--f-mono); color: var(--muted); letter-spacing: .14em; text-transform: uppercase; }
.tblock b { font: 600 15px/1.3 var(--f-mono); color: var(--ink); overflow-wrap: anywhere; }
.tblock .big b { font: 800 clamp(26px, 3.6vw, 44px)/1 var(--f-display); font-variation-settings: "wdth" 115; letter-spacing: -.02em; }
.tblock a { color: var(--accent); }
@media (max-width: 720px) {
  .tblock { grid-template-columns: 1fr 1fr; }
  .tblock .big { grid-column: 1 / -1; }
  .tblock > div { border-width: 0 1px 1px 0 !important; }
}

/* chat in drafting style */
.chat-fab { background: var(--accent); color: var(--bg-deep); border-radius: 2px; font-family: var(--f-mono); letter-spacing: .04em; }
.chat { background-color: var(--surface-solid); border-color: var(--line-strong); border-radius: 3px; }
.msg { border-radius: 3px; }
.msg.user { background: var(--accent); color: var(--bg-deep); }
.msg.bot { background: rgba(7, 26, 51, .7); }
.chat-sugg button { border-radius: 2px; font-family: var(--f-mono); font-size: 12px; }
.chat-form input { background: rgba(7, 26, 51, .7); border-radius: 2px; }
.chat-form button { background: var(--accent); color: var(--bg-deep); border-radius: 2px; }

@media (prefers-reduced-motion: reduce) {
  .intro { height: auto; }
  .intro + main { margin-top: 0; }
  .intro-stage { position: relative; height: auto; min-height: 80vh; }
  .intro-svg .ln { stroke-dashoffset: 0; }
  .intro-cue, .intro-skip { display: none; }
  .split .w > span, .rv { transform: none; opacity: 1; }
}
.intro-svg .blink { animation: pulse 1s steps(1) infinite; }

/* lightbox: screenshots at full resolution */
.gallery img, .card-more img { cursor: zoom-in; }
.gallery figure .zoomtag {
  position: absolute; top: 10px; right: 10px; z-index: 2; pointer-events: none;
  font: 500 10px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--bg-deep); background: var(--accent); padding: 6px 8px; opacity: 0; transform: translateY(-4px); transition: opacity .2s, transform .2s;
}
.gallery figure:hover .zoomtag, .gallery figure:focus-within .zoomtag { opacity: 1; transform: none; }
.lb {
  position: fixed; inset: 0; z-index: 60; display: grid; grid-template-rows: auto minmax(0, 1fr) auto;
  background: rgba(5, 18, 36, .95); backdrop-filter: blur(6px);
  padding: max(14px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) max(14px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
  background-image: linear-gradient(var(--grid-minor) 1px, transparent 1px), linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size: 24px 24px;
}
.lb[hidden] { display: none; }
.lb-top { display: flex; align-items: center; gap: 12px; font: 500 11px/1 var(--f-mono); letter-spacing: .14em; color: var(--muted); text-transform: uppercase; }
.lb-top .sp { flex: 1; }
.lb button { font: 500 12px/1 var(--f-mono); color: var(--ink); background: var(--bg-deep); border: 1px solid var(--line-strong); padding: 9px 12px; cursor: pointer; letter-spacing: .08em; }
.lb button:hover { border-color: var(--accent); color: var(--accent); }
.lb-view { position: relative; overflow: auto; display: grid; place-items: center; margin: 12px 0; overscroll-behavior: contain; }
.lb-view.one { place-items: start; cursor: zoom-out; }
.lb-fig { margin: auto; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.lb-dim { align-self: stretch; display: flex; align-items: center; gap: 8px; font: 500 10px/1 var(--f-mono); color: var(--accent); letter-spacing: .12em; }
.lb-dim::before, .lb-dim::after { content: ""; flex: 1; height: 7px; border: solid var(--accent); border-width: 0 1px; background: linear-gradient(var(--accent), var(--accent)) center / 100% 1px no-repeat; opacity: .7; }
.lb-img { display: block; max-width: min(1400px, calc(100vw - 48px)); max-height: calc(100dvh - 190px); width: auto; height: auto; border: 1px solid var(--line-strong); box-shadow: 0 30px 80px rgba(0, 0, 0, .5); cursor: zoom-in; background: #000; }
.lb-view.one .lb-img { max-width: none; max-height: none; cursor: zoom-out; }
.lb-cap { max-width: 900px; margin: 0 auto; display: flex; gap: 14px; align-items: flex-start; font-size: 14.5px; color: var(--muted); }
.lb-cap b { color: var(--ink); }
.lb-cap .fig { font: 500 11px/1.6 var(--f-mono); color: var(--accent); letter-spacing: .1em; white-space: nowrap; }
.lb-nav { display: flex; gap: 8px; }
@media (max-width: 600px) { .lb-cap { flex-direction: column; gap: 4px; } .lb-hint { display: none; } }
.intro-svg text.tile { font-size: 12.5px; fill: var(--ink); letter-spacing: .02em; }

/* ---------- L1 plates: favourite apps ---------- */
.plates { display: grid; gap: 64px; counter-reset: plate; }
.plate { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 36px; align-items: center; }
.plate:nth-child(even) .plate-fig { order: 2; }
.plate.wide { grid-template-columns: minmax(0, 1fr); }
.plate.wide .plate-txt { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 36px; }
.plate.wide .plate-txt > :is(.plate-no, h3, p) { grid-column: 1; }
.plate.wide .plate-txt > ul { grid-column: 2; grid-row: 1 / span 3; align-self: end; }
.plate.wide .plate-txt > .plate-more { grid-column: 2; }
.plate-fig { margin: 0; position: relative; min-width: 0; }
.plate-fig img { width: 100%; border: 1px solid var(--line-strong); box-shadow: 0 0 0 6px rgba(7, 26, 51, .55), 0 0 0 7px var(--line); }
.plate-fig::before, .plate-fig::after {   /* registration marks outside the plate */
  content: ""; position: absolute; width: 18px; height: 18px; border: solid var(--accent); pointer-events: none; opacity: .8;
}
.plate-fig::before { top: -14px; left: -14px; border-width: 1px 0 0 1px; }
.plate-fig::after { bottom: -14px; right: -14px; border-width: 0 1px 1px 0; }
.plate-fig.drawn { background: rgba(7, 26, 51, .6); border: 1px solid var(--line-strong); padding: 18px; }
.plate-fig.drawn svg { display: block; width: 100%; height: auto; }
.bp rect { fill: rgba(11, 38, 71, .7); stroke: var(--line-strong); stroke-width: 1; }
.bp rect.hot { stroke: var(--warm); }
.bp text { font: 11px var(--f-mono); fill: var(--muted); }
.bp text.b { fill: var(--ink); font-size: 12.5px; }
.bp text.cap { fill: var(--accent); letter-spacing: .1em; font-size: 10.5px; }
.bp text.w { fill: var(--warm); }
.bp .ar { stroke: var(--accent); stroke-width: 1.3; fill: none; marker-end: url(#arw); }
.bp .dsh { stroke: var(--line-strong); stroke-dasharray: 3 4; fill: none; }
.plate-fig.term pre { margin: 0; font: 13px/1.75 var(--f-mono); color: var(--muted); white-space: pre-wrap; overflow-wrap: anywhere; }
.plate-fig.term pre b { color: var(--accent); font-weight: 500; }
.plate-fig.term pre i { font-style: normal; color: var(--warm); }
.plate-fig.term .caret { display: inline-block; width: .55em; height: 1.05em; background: var(--accent); vertical-align: -.15em; animation: pulse 1s steps(1) infinite; }
.plate-txt { min-width: 0; }
.plate-no { margin: 0 0 10px; font: 500 11px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.plate-no::before { counter-increment: plate; }
.plate-txt h3 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; letter-spacing: -.02em; font-variation-settings: "wdth" 112; margin-bottom: 12px; }
.plate-txt h3 small { font-size: .5em; color: var(--warm); font-weight: 600; }
.plate-txt > p:not(.plate-no) { color: var(--muted); margin: 0 0 14px; font-size: 16.5px; }
.plate-txt ul { margin: 0 0 18px; padding: 0; list-style: none; display: grid; gap: 8px; font-size: 14.5px; }
.plate-txt li { padding-left: 22px; position: relative; }
.plate-txt li::before { content: ""; position: absolute; left: 0; top: .72em; width: 12px; height: 1px; background: var(--accent); }
.plate-more, .pick-cta { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; color: var(--accent); background: transparent; border: 1px solid var(--accent); padding: 10px 14px; cursor: pointer; }
.plate-more:hover { background: var(--accent); color: var(--bg-deep); }
@media (max-width: 860px) {
  .plate, .plate.wide .plate-txt { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .plate:nth-child(even) .plate-fig { order: 0; }
  .plate.wide .plate-txt > ul, .plate.wide .plate-txt > .plate-more { grid-column: 1; grid-row: auto; }
}

/* ---------- L2 assemblies ---------- */
#assemblies { display: grid; gap: 56px; }
.asm-head { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 18px; align-items: baseline; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px dashed var(--line-strong); }
.asm-no { font: 500 11px/1 var(--f-mono); letter-spacing: .14em; color: var(--bg-deep); background: var(--accent); padding: 6px 8px; align-self: center; }
.asm-head h3 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; font-variation-settings: "wdth" 110; }
.asm-head p { grid-column: 2; margin: 6px 0 0; color: var(--muted); font-size: 15px; max-width: 70ch; }
.pick { cursor: pointer; transition: border-color .2s, background-color .2s; }
.pick:hover, .pick:focus-visible { border-color: var(--accent) !important; background-color: var(--accent-soft) !important; }

/* A · metrics: before → after dimension lines */
.asm-metrics .asm-body { border: 1px solid var(--line-strong); }
.met { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.4fr) 112px; gap: 18px; align-items: center; padding: 13px 16px; border-top: 1px solid var(--line); }
.met:first-child { border-top: 0; }
.met-what { font-size: 14.5px; }
.met-dim { display: flex; align-items: center; gap: 10px; font: 13px var(--f-mono); min-width: 0; }
.met-dim s { text-decoration: none; color: var(--muted); white-space: nowrap; }
.met-dim i { flex: 1; min-width: 24px; height: 9px; border: solid var(--line-strong); border-width: 0 1px; background: linear-gradient(var(--line-strong), var(--line-strong)) center / 100% 1px no-repeat; position: relative; }
.met-dim i::after { content: ""; position: absolute; right: -1px; top: 50%; width: 7px; height: 7px; border: solid var(--accent); border-width: 1px 1px 0 0; transform: translateY(-50%) rotate(45deg); }
.met-dim b { color: var(--ink); font-weight: 500; white-space: nowrap; }
.met-gain { font: 800 18px/1 var(--f-display); font-variation-settings: "wdth" 110; text-align: right; color: var(--accent); }
@media (max-width: 720px) { .met { grid-template-columns: minmax(0, 1fr) auto; } .met-dim { grid-column: 1 / -1; order: 3; } }

/* B · flow: model chains */
.asm-flow .asm-body { display: grid; gap: 14px; }
.chain { border: 1px solid var(--line); padding: 16px; background: rgba(7, 26, 51, .45); }
.chain-h { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; margin-bottom: 14px; }
.chain-h b { font: 700 18px var(--f-display); font-variation-settings: "wdth" 108; }
.chain-h span { color: var(--muted); font-size: 14px; flex: 1 1 320px; }
.chain ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 12px 26px; }
.chain li { position: relative; font: 12.5px/1 var(--f-mono); padding: 10px 12px; border: 1px solid var(--line-strong); background: var(--bg); white-space: nowrap; }
.chain li.hot { border-color: var(--warm); color: var(--warm); }
.chain li:not(:last-child)::after { content: "→"; position: absolute; right: -20px; top: 50%; transform: translateY(-50%); color: var(--accent); }
.chain li { animation: lit 4s calc(var(--i) * .4s) infinite; }
@keyframes lit { 0%, 30%, 100% { box-shadow: none; } 8%, 18% { box-shadow: 0 0 0 1px var(--accent), 0 0 18px rgba(111, 220, 255, .25); } }

/* C · spec sheets */
.asm-spec .asm-body { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.spec { border: 1px solid var(--line); padding: 14px; display: flex; flex-direction: column; gap: 10px; background: rgba(7, 26, 51, .45); min-width: 0; }
.spec-fig { aspect-ratio: 16 / 10; background: rgba(7, 26, 51, .7); border: 1px solid var(--line-strong); overflow: hidden; display: grid; place-items: center; }
.spec-fig img { width: 100%; height: 100%; object-fit: cover; }
.spec-fig img.pixel { object-fit: contain; }
.spec-fig canvas { width: 100%; height: 100%; display: block; }
.spec h4 { margin: 4px 0 0; font: 700 18px var(--f-display); }
.spec > p { margin: 0; color: var(--muted); font-size: 14px; }
.spec dl { margin: auto 0 0; border-top: 1px dashed var(--line-strong); }
.spec dl div { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--line); }
.spec dt { font: 500 10.5px/1.5 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.spec dd { margin: 0; font: 13px/1.5 var(--f-mono); color: var(--ink); }
@media (max-width: 900px) { .asm-spec .asm-body { grid-template-columns: minmax(0, 1fr); } }

/* D · bill of materials */
.asm-bom .asm-body { border: 1px solid var(--line-strong); overflow-x: auto; }
.bom { display: grid; grid-template-columns: 44px minmax(150px, .9fr) minmax(0, 2.2fr) minmax(110px, .8fr); gap: 14px; padding: 11px 14px; border-top: 1px solid var(--line); align-items: baseline; font-size: 14px; }
.bom-hd { font: 500 10.5px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); border-top: 0; background: rgba(7, 26, 51, .6); }
.bom-no { font: 12px var(--f-mono); color: var(--accent); }
.bom b { font: 500 13.5px var(--f-mono); color: var(--ink); }
.bom-d { color: var(--muted); }
.bom-s { font: 12px var(--f-mono); color: var(--muted); }
@media (max-width: 720px) { .bom { grid-template-columns: 34px minmax(0, 1fr); } .bom-d, .bom-s { grid-column: 2; } .bom-hd { display: none; } }

/* E · interface plates */
.asm-plates .asm-body { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.tile { border: 1px solid var(--line); padding: 12px; display: flex; flex-direction: column; gap: 8px; background: rgba(7, 26, 51, .45); min-width: 0; }
.tile-fig { aspect-ratio: 16 / 10; border: 1px solid var(--line-strong); overflow: hidden; background: rgba(7, 26, 51, .7); }
.tile-fig img { width: 100%; height: 100%; object-fit: cover; object-position: top left; }
.tile-fig canvas { width: 100%; height: 100%; display: block; }
.tile h4 { margin: 2px 0 0; font: 700 17px var(--f-display); }
.tile p { margin: 0; color: var(--muted); font-size: 13.5px; }
.tile-fact { margin-top: auto; font: 11.5px/1.4 var(--f-mono); color: var(--accent); }

/* F · spec rows */
.asm-rows .asm-body { border: 1px solid var(--line-strong); }
.row { display: grid; grid-template-columns: 170px minmax(0, 2fr) minmax(0, 1fr); gap: 18px; padding: 13px 16px; border-top: 1px solid var(--line); align-items: baseline; }
.row:first-child { border-top: 0; }
.row b { font: 700 16px var(--f-display); }
.row-line { color: var(--muted); font-size: 14px; }
.row-fact { font: 12px/1.45 var(--f-mono); color: var(--accent); text-align: right; }
@media (max-width: 720px) { .row { grid-template-columns: minmax(0, 1fr); gap: 4px; } .row-fact { text-align: left; } }

/* spec sheet dialog */
.sheet { position: fixed; inset: 0; z-index: 55; display: grid; place-items: center; background: rgba(5, 18, 36, .82); backdrop-filter: blur(4px);
  padding: max(16px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) max(16px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px)); }
.sheet[hidden] { display: none; }
.sheet-panel { width: min(760px, 100%); max-height: calc(100dvh - 32px); overflow-y: auto; background: var(--surface-solid); border: 1px solid var(--accent);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5); background-image: linear-gradient(var(--grid-minor) 1px, transparent 1px), linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px); background-size: 24px 24px; }
.sheet-panel header { position: sticky; top: 0; display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; background: var(--bg-deep); border-bottom: 1px solid var(--line-strong); }
.sheet-no { font: 500 11px var(--f-mono); letter-spacing: .14em; color: var(--accent); }
.sheet-x { font: 500 12px var(--f-mono); color: var(--ink); background: transparent; border: 1px solid var(--line-strong); padding: 8px 12px; cursor: pointer; }
.sheet-x:hover { border-color: var(--accent); color: var(--accent); }
.sheet-body { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 12px; }
.sheet-body img { width: 100%; border: 1px solid var(--line-strong); }
.sheet-body h3 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; font-variation-settings: "wdth" 112; }
.sheet-line { margin: 0; font-size: 17px; color: var(--ink); }
.sheet-fact { margin: 0; font: 13px var(--f-mono); color: var(--accent); }
.sheet-body h4 { margin: 8px 0 0; font: 500 11px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.sheet-body ul { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 15px; color: var(--muted); }
.sheet-body li::marker { color: var(--accent); }
.intro-svg text.tile { font-size: 12.5px; fill: var(--ink); letter-spacing: .02em; }
@media (max-width: 760px) { .drift { display: none; } }

/* ---------- chat FAB as a speech bubble + drafted robot mascot ---------- */
.chat-fab { overflow: visible; }
.chat-fab::after { content: ""; position: absolute; left: 20px; bottom: -5px; width: 10px; height: 10px; background: var(--accent); transform: rotate(45deg); }
.fab-ico { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; }
.fab-ico circle { fill: currentColor; stroke: none; transform-box: fill-box; animation: fabdot 1.4s infinite; }
.fab-ico circle:nth-of-type(2) { animation-delay: .18s; }
.fab-ico circle:nth-of-type(3) { animation-delay: .36s; }
@keyframes fabdot { 0%, 60%, 100% { opacity: .3; transform: none; } 30% { opacity: 1; transform: translateY(-1.5px); } }

.mascot { position: fixed; z-index: 22; left: 0; top: 0; width: 80px; height: 90px; padding: 0; border: 0; background: none; cursor: pointer; opacity: 1; transition: opacity .4s; }
.mascot.ready { transition: left .55s cubic-bezier(.3, 1.35, .5, 1), top .55s cubic-bezier(.3, 1.35, .5, 1), opacity .4s; }
.mascot svg { display: block; width: 80px; height: 90px; overflow: visible; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.mascot .fill { fill: var(--bg-deep); }
.mascot .face { fill: rgb(111 220 255 / .12); stroke-width: 1.2; }
.mascot .eyes { transition: transform .15s; }
.mascot .eye { fill: var(--accent); stroke: none; transform-box: fill-box; transform-origin: center; animation: botblink 5s infinite; }
.mascot .ant { fill: var(--warm); stroke: none; animation: pulse 2s infinite; }
.mascot .tick { stroke-width: 1; opacity: .6; }
.mascot .arm-l, .mascot .arm-r, .mascot .leg-l, .mascot .leg-r, .mascot .up { transform-box: view-box; }
.mascot .arm-l { transform-origin: 20px 46px; } .mascot .arm-r { transform-origin: 44px 46px; }
.mascot .leg-l { transform-origin: 26px 60px; } .mascot .leg-r { transform-origin: 38px 60px; }
@keyframes botblink { 0%, 93%, 100% { transform: scaleY(1); } 95% { transform: scaleY(.1); } }
.mascot.wave .arm-r { animation: botwave 1.6s ease-in-out; }
@keyframes botwave { 15%, 45%, 75% { transform: rotate(-150deg); } 30%, 60% { transform: rotate(-110deg); } 100% { transform: none; } }
.mascot.hop svg { animation: bothop .7s cubic-bezier(.3, 0, .3, 1); }
@keyframes bothop { 30% { transform: translateY(-14px); } 55% { transform: none; } 70% { transform: translateY(-4px); } 85% { transform: none; } }
/* sitting on the open chat: legs hang over the edge and swing */
.mascot.sit .leg-l { animation: botkick 2.4s ease-in-out infinite; }
.mascot.sit .leg-r { animation: botkick 2.4s ease-in-out -1.2s infinite; }
.mascot.sit .up { animation: botbreathe 3.2s ease-in-out infinite; }
.mascot.sit .arm-l { transform: rotate(25deg); } .mascot.sit .arm-r { transform: rotate(-25deg); }
@keyframes botkick { 50% { transform: rotate(22deg); } }
@keyframes botbreathe { 50% { transform: translateY(1px); } }
/* waiting for an answer: eyes scan, antenna blinks fast */
.mascot.think .eye { animation: botscan .5s ease-in-out infinite alternate; }
.mascot.think .ant { animation-duration: .4s; }
@keyframes botscan { from { transform: translateX(-3px); } to { transform: translateX(3px); } }

.mascot-say { position: fixed; z-index: 22; max-width: min(230px, calc(100vw - 110px)); font: 12px/1.45 var(--f-mono); color: var(--ink); background: var(--bg-deep);
  border: 1px solid var(--accent); border-radius: 2px; padding: 9px 12px; box-shadow: 0 8px 24px rgb(0 0 0 / .35); cursor: pointer;
  opacity: 0; transform: translateY(6px) scale(.96); transform-origin: right top; transition: opacity .25s, transform .25s; pointer-events: none; }
.mascot-say.on { opacity: 1; transform: none; pointer-events: auto; }
.mascot-say::after { content: ""; position: absolute; right: -6px; top: 14px; width: 10px; height: 10px; background: var(--bg-deep); border: solid var(--accent); border-width: 1px 1px 0 0; transform: rotate(45deg); }
body.in-intro .mascot, body.in-intro .mascot-say { opacity: 0; pointer-events: none; }
@media (prefers-reduced-motion: reduce) {
  .mascot *, .mascot svg, .fab-ico circle { animation: none !important; }
  .mascot.ready { transition: opacity .4s; }
}

/* ---------- language switcher (i18n.js) ---------- */
html.i18n-wait body { visibility: hidden; }
.lang { position: fixed; z-index: 23; top: max(14px, env(safe-area-inset-top, 0px)); right: max(16px, env(safe-area-inset-right, 0px));
  display: flex; background: rgb(7 26 51 / .82); backdrop-filter: blur(6px); border: 1px solid var(--line-strong); border-radius: 2px; }
.lang button { font: 500 11px/1 var(--f-mono); letter-spacing: .12em; color: var(--muted); background: none; border: 0; padding: 8px 10px; cursor: pointer; }
.lang button + button { border-left: 1px solid var(--line); }
.lang button:hover { color: var(--ink); }
.lang button[aria-pressed="true"] { color: var(--bg-deep); background: var(--accent); }
.lang button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* intro: bouncing down-arrow so it is obvious the page scrolls */
.intro-arrow { position: absolute; left: 50%; bottom: max(22px, env(safe-area-inset-bottom, 0px)); width: 34px; height: 34px; margin-left: -17px; animation: arrowbob 1.8s ease-in-out infinite; }
.intro-arrow svg { width: 100%; height: 100%; fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.intro-arrow path + path { opacity: .45; }
@keyframes arrowbob { 0%, 100% { transform: translateY(0); opacity: .7; } 50% { transform: translateY(8px); opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .intro-arrow { animation: none; } }
/* phones: keep the scroll cue off the intro title, and the skip button clear of the language switcher */
@media (max-width: 600px) {
  .intro-cue { top: max(64px, calc(env(safe-area-inset-top, 0px) + 50px)); bottom: auto; left: 50%; right: auto; transform: translateX(-50%); white-space: nowrap; }
  .intro-skip { left: max(16px, env(safe-area-inset-left, 0px)); transform: none; }
  .intro-arrow { bottom: max(104px, calc(env(safe-area-inset-bottom, 0px) + 90px)); }
}