/* Tokens follow cognitora.dev: dark navy, blue accent, Inter + JetBrains Mono, 2px radius. */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  --bg: hsl(222 47% 5%);
  --bg-2: hsl(222 47% 7%);
  --panel: hsl(222 47% 7%);
  --sec: hsl(217 33% 10%);
  --line: hsl(217 33% 14%);
  --ink: hsl(210 40% 98%);
  --ink-2: hsl(215 20% 65%);
  --ink-3: hsl(215 16% 52%);
  --accent: hsl(217 91% 60%);
  --accent-ink: #fff;
  --grad: linear-gradient(90deg, #3c83f6, #3ebaf4);
  --radius: 2px;
  --max: 1200px;
  --font: Inter, ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--radius); }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  height: 56px;
  padding: 0 max(16px, calc((100vw - var(--max)) / 2 + 16px));
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; }
.brand .tag { border: 1px solid var(--line); background: color-mix(in srgb, var(--sec) 40%, transparent); padding: 2px 6px; font: 10px/1.4 var(--mono); color: var(--ink-2); font-weight: 400; }
.nav nav { display: flex; gap: 22px; flex-wrap: wrap; align-items: center; }
.nav nav a { color: var(--ink-2); font: 12px var(--mono); transition: color .15s; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }

/* ---------- layout */
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
section { padding: 104px 0; border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent); position: relative; }
.eyebrow { color: var(--accent); font: 500 12px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 14px; }
h1, h2, h3 { line-height: 1.1; margin: 0; letter-spacing: -0.025em; font-weight: 600; text-wrap: balance; }
h1 { font-size: clamp(38px, 6.2vw, 72px); line-height: 1.04; letter-spacing: -0.03em; }
h2 { font-size: clamp(28px, 4vw, 44px); margin-bottom: 18px; }
h3 { font-size: 20px; letter-spacing: -0.015em; }
.lede { color: var(--ink-2); font-size: clamp(16px, 1.6vw, 18px); max-width: 680px; margin: 20px 0 0; text-wrap: pretty; }
p { margin: 0 0 14px; }
.muted { color: var(--ink-3); font-size: 14px; }

/* ---------- hero */
.hero { padding: 96px 0 72px; overflow: hidden; }
.hero::before {            /* grid backdrop, as on cognitora.dev */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(color-mix(in srgb, var(--line) 30%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--line) 30%, transparent) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 20%, transparent 70%);
  mask-image: radial-gradient(ellipse at center, #000 20%, transparent 70%);
}
.hero::after {             /* top glow */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 600px; pointer-events: none;
  background: radial-gradient(ellipse at top, hsl(217 91% 60% / .14), transparent 60%);
}
.hero .wrap { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 28px; }
.hero-grid > div:first-child { display: flex; flex-direction: column; align-items: center; text-align: center; }
.hero-grid .lede { margin-left: auto; margin-right: auto; }
.pill { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: color-mix(in srgb, var(--sec) 40%, transparent);
  padding: 4px 12px; font: 500 12px var(--mono); color: var(--ink-2); margin-bottom: 24px; }
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 34px; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; height: 44px;
  padding: 0 20px; border-radius: var(--radius); font-weight: 500; font-size: 14px;
  border: 1px solid var(--line); color: var(--ink); background: color-mix(in srgb, var(--sec) 40%, transparent);
  transition: border-color .15s, background .15s;
}
.btn:hover { text-decoration: none; border-color: hsl(217 91% 60% / .5); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
  box-shadow: 0 0 0 1px hsl(217 91% 60% / .3), 0 0 20px -4px hsl(217 91% 60% / .5); }
.btn.primary:hover { background: hsl(217 91% 60% / .9); }
.hero-img { display: block; margin-top: 28px; overflow: hidden; border: 1px solid var(--line); background: var(--panel);
  box-shadow: 0 0 0 1px hsl(217 91% 60% / .15), 0 40px 120px -30px hsl(217 91% 60% / .35); }

/* ---------- hero slideshow */
.show { position: relative; margin-top: 36px; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--line);
  background: radial-gradient(ellipse at 50% 30%, hsl(217 60% 14%), hsl(222 47% 4%) 70%);
  box-shadow: 0 0 0 1px hsl(217 91% 60% / .15), 0 40px 120px -30px hsl(217 91% 60% / .35); outline: none; user-select: none; }
.show:focus-visible { box-shadow: 0 0 0 2px var(--accent); }
.slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .9s ease, visibility 0s .9s; }
.slide.on { opacity: 1; visibility: visible; transition: opacity .9s ease; }
.slide > img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.08); transition: transform 7s cubic-bezier(.2,.6,.3,1); }
.slide.on > img { transform: scale(1); }
.slide.fit > img { object-fit: contain; background: #000; transform: scale(1.03); }
.slide.fit.on > img { transform: scale(1); }
.tower3d { position: absolute; inset: 0; cursor: grab; touch-action: pan-y; }
.tower3d:active { cursor: grabbing; }
.tower3d canvas { width: 100% !important; height: 100% !important; display: block; }
.tower3d .poster { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; transition: opacity .6s; }
.tower3d.ready .poster { opacity: 0; }
.live { position: absolute; top: 30px; left: 18px; display: inline-flex; align-items: center; gap: 8px; font: 500 11px var(--mono);
  color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; padding: 4px 10px; border: 1px solid var(--line);
  background: hsl(222 47% 5% / .6); backdrop-filter: blur(6px); pointer-events: none; }
.live i { width: 6px; height: 6px; border-radius: 50%; background: #ef4444; box-shadow: 0 0 8px #ef4444; animation: blink 1.6s infinite; }
@keyframes blink { 50% { opacity: .3; } }
.cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 80px 24px 22px; display: flex; flex-direction: column; gap: 4px;
  background: linear-gradient(0deg, hsl(222 47% 4% / .92), transparent); pointer-events: none; text-align: left; }
.cap > * { opacity: 0; transform: translateY(10px); transition: opacity .6s ease, transform .6s ease; }
.slide.on .cap > * { opacity: 1; transform: none; }
.slide.on .cap .t { transition-delay: .12s; } .slide.on .cap .s { transition-delay: .24s; }
.cap .k { font: 500 11px var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .06em; }
.cap .t { font-size: clamp(18px, 2.4vw, 28px); font-weight: 600; letter-spacing: -0.02em; color: var(--ink); max-width: 70%; }
.cap .s { font-size: 14px; color: var(--ink-2); max-width: 70%; }
.show-bars { position: absolute; top: 12px; left: 16px; right: 16px; display: flex; gap: 6px; z-index: 2; }
.show-bars button { flex: 1; height: 14px; padding: 6px 0; border: 0; background: none; cursor: pointer; position: relative; }
.show-bars button::before, .show-bars button::after { content: ""; position: absolute; left: 0; top: 6px; height: 2px; }
.show-bars button::before { right: 0; background: hsl(210 40% 98% / .16); }
.show-bars button::after { width: calc(var(--p, 0) * 100%); background: var(--grad); box-shadow: 0 0 8px hsl(217 91% 60% / .8); }
.show-ctl { position: absolute; right: 16px; bottom: 18px; display: flex; align-items: center; gap: 6px; z-index: 2; }
.show-count { font: 12px var(--mono); color: var(--ink-3); margin-right: 8px; }
.show-count b { color: var(--ink); font-weight: 500; }
.show-ctl button { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  border: 1px solid var(--line); background: hsl(222 47% 5% / .6); backdrop-filter: blur(6px); color: var(--ink-2); border-radius: var(--radius); transition: color .15s, border-color .15s; }
.show-ctl button:hover { color: var(--ink); border-color: hsl(217 91% 60% / .5); }
.show-ctl svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.show-pause .i-play { display: none; }
.show-pause[aria-pressed="true"] .i-play { display: inline; } .show-pause[aria-pressed="true"] .i-pause { display: none; }
@media (max-width: 760px) {
  .show { aspect-ratio: 4 / 5; }
  .cap { padding: 60px 16px 64px; } .cap .t, .cap .s { max-width: 100%; } .cap .s { font-size: 13px; }
  .show-ctl { left: 16px; right: 16px; bottom: 16px; } .show-count { margin-right: auto; }
}
@media (prefers-reduced-motion: reduce) { .slide, .slide > img, .cap > * { transition: none; } .live i { animation: none; } }

/* ---------- stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 36px; }
.stat { background: var(--bg-2); padding: 24px 22px; }
.stat b { display: block; font-size: clamp(26px, 3vw, 34px); font-weight: 600; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat:first-child b { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--ink-2); font-size: 14px; }
.stat i { color: var(--ink-3); font: 11px var(--mono); font-style: normal; }

/* ---------- two-column text + figure */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 48px; align-items: center; }
.formula { font: 13px/1.7 var(--mono); background: var(--panel); border: 1px solid var(--line); padding: 16px 18px; color: var(--ink); overflow-x: auto; margin: 18px 0;
  border-left: 2px solid var(--accent); }
.figure { background: #fff; padding: 10px; border: 1px solid var(--line); }
.figure.dark { background: var(--panel); }
figure { margin: 0; }
figcaption { color: var(--ink-3); font: 12px/1.5 var(--mono); margin-top: 10px; }

/* ---------- boards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 40px; }
.card { background: var(--panel); overflow: hidden; display: flex; flex-direction: column; transition: background .2s; }
.card:hover { background: var(--sec); }
.card img { aspect-ratio: 16 / 10; object-fit: cover; border-bottom: 1px solid var(--line); transition: transform .6s ease; }
.card:hover img { transform: scale(1.03); }
.card .body { padding: 22px 22px 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; position: relative; background: inherit; }
.card .tag { color: var(--ink-3); font: 12px var(--mono); }
.card ul { list-style: none; padding: 0; margin: 4px 0 0; display: grid; gap: 7px; }
.card li { color: var(--ink-2); font-size: 14px; padding-left: 16px; position: relative; }
.card li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 6px; height: 6px; background: var(--accent); }
.card .price { margin-top: auto; padding-top: 14px; border-top: 1px dashed var(--line); display: flex; justify-content: space-between; font: 12px var(--mono); color: var(--ink-2); align-items: baseline; }
.card .price b { color: var(--ink); font: 600 16px var(--font); }

.card h3.prod { display: flex; align-items: center; gap: 12px; }
.card h3.prod img { width: 40px; height: 40px; padding: 6px; border: 1px solid var(--line); background: var(--bg); }
.foot a.parent { display: inline-flex; align-items: center; gap: 6px; vertical-align: middle; }
.foot a.parent img { width: 14px; height: 14px; }

/* ---------- tower */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 36px; }
.duo img { background: #000; }
.points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 24px; }
.points div { background: var(--bg); padding: 20px 22px; }
.points h3 { font-size: 16px; margin-bottom: 6px; }
.points p { color: var(--ink-2); font-size: 15px; margin: 0; }

/* ---------- tables */
.table-wrap { overflow-x: auto; margin-top: 32px; border: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink-2); font: 500 12px var(--mono); background: var(--bg-2); }
td:first-child { color: var(--ink-2); font: 12px/1.9 var(--mono); white-space: nowrap; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- hardware status */
.status { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 24px; }
.step { background: var(--panel); padding: 22px; }
.step .state { display: inline-block; font: 500 11px var(--mono); padding: 2px 8px; margin-bottom: 12px; border: 1px solid; text-transform: uppercase; letter-spacing: .04em; }
.state.done { background: hsl(158 64% 52% / .1); color: hsl(158 64% 52%); border-color: hsl(158 64% 52% / .35); }
.state.next { background: hsl(217 91% 60% / .1); color: var(--accent); border-color: hsl(217 91% 60% / .35); }
.step p { color: var(--ink-2); font-size: 14px; margin: 8px 0 0; }

/* ---------- footer */
.foot { padding: 48px 16px 56px; text-align: center; color: var(--ink-3); font-size: 13px; }
.foot p { max-width: 760px; margin: 0 auto 8px; }
.foot a { color: var(--ink-2); font-family: var(--mono); font-size: 12px; }
.foot a:hover { color: var(--ink); text-decoration: none; }
.foot .brand { justify-content: center; margin-bottom: 14px; }

/* ---------- whitepaper */
.doc { background: radial-gradient(ellipse at 50% 0, hsl(217 91% 60% / .08), transparent 600px) var(--bg); }
.prose { max-width: 820px; margin: 0 auto; padding: 56px 16px 40px; }
.prose h1 { font-size: clamp(34px, 4.8vw, 52px); margin-bottom: 12px; }
.prose h1 + p strong { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-size: 20px; }
.prose h2 { font-size: 28px; margin: 64px 0 14px; padding-top: 16px; border-top: 1px solid var(--line); }
.prose h3 { font-size: 19px; margin: 32px 0 10px; }
.prose p, .prose li { color: hsl(214 25% 82%); }
.prose strong { color: var(--ink); }
.prose img { margin: 24px 0; border: 1px solid var(--line); }
.prose table { display: block; overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); }
.prose table td:first-child { font: inherit; color: inherit; white-space: normal; }
.prose pre { background: var(--panel); border: 1px solid var(--line); border-left: 2px solid var(--accent); padding: 16px 18px; overflow-x: auto; }
.prose code { font-family: var(--mono); font-size: 0.86em; }
.prose :not(pre) > code { background: var(--sec); padding: 1px 6px; border: 1px solid var(--line); }
.prose hr { display: none; }

/* ---------- responsive */
@media (max-width: 960px) {
  .split, .duo { grid-template-columns: minmax(0, 1fr); }
  .cards, .status { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .points { grid-template-columns: 1fr; }
  section { padding: 72px 0; }
  .hero { padding: 64px 0 56px; }
}
@media (max-width: 640px) {
  .nav nav { gap: 14px; flex-wrap: nowrap; }
  .nav nav a.hide-sm, .brand .tag { display: none; }
  .stats { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .card img { transition: none; } }