:root {
  color-scheme: dark;
  --bg: #070b10;
  --bg-elevated: #0b1119;
  --surface: rgba(15, 23, 34, .78);
  --surface-solid: #101923;
  --surface-2: #152231;
  --text: #eef6ff;
  --muted: #9cafc2;
  --dim: #6f8397;
  --line: rgba(149, 178, 207, .18);
  --line-strong: rgba(114, 231, 210, .38);
  --accent: #65ead5;
  --accent-strong: #2dd4bf;
  --accent-2: #89a9ff;
  --warning: #ffd479;
  --danger: #ff8793;
  --shadow: 0 28px 90px rgba(0, 0, 0, .38);
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 30px;
  --max: 1220px;
  --reading: 800px;
  --mono: "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-elevated: #eef3f8;
  --surface: rgba(255, 255, 255, .83);
  --surface-solid: #ffffff;
  --surface-2: #e8eef5;
  --text: #101a25;
  --muted: #526679;
  --dim: #728497;
  --line: rgba(45, 68, 92, .15);
  --line-strong: rgba(0, 128, 116, .32);
  --accent: #007f73;
  --accent-strong: #006e65;
  --accent-2: #335fcb;
  --shadow: 0 28px 80px rgba(53, 72, 94, .16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% -10%, rgba(45, 212, 191, .14), transparent 34rem),
    radial-gradient(circle at 92% 5%, rgba(137, 169, 255, .12), transparent 31rem),
    linear-gradient(180deg, var(--bg), var(--bg-elevated));
  font-family: var(--sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .32;
  background-image:
    linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 86%);
}
a { color: inherit; }
button, input { font: inherit; }
::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }

.skip-link {
  position: fixed; top: -5rem; left: 1rem; z-index: 1000;
  padding: .7rem 1rem; color: var(--bg); background: var(--text);
  border-radius: 10px;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(22px) saturate(140%);
}
.site-nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max); margin: auto; padding: .85rem 1.25rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .75rem;
  font-weight: 820; text-decoration: none; letter-spacing: -.02em;
}
.brand-mark {
  position: relative; display: grid; place-items: center;
  width: 2.45rem; height: 2.45rem;
  color: var(--accent); font: 700 .78rem var(--mono);
  border: 1px solid var(--line-strong); border-radius: 12px;
  background: linear-gradient(145deg, var(--surface-2), transparent);
  box-shadow: inset 0 1px rgba(255,255,255,.05), 0 0 28px rgba(45,212,191,.08);
}
.brand-mark::after {
  content: ""; position: absolute; inset: 5px;
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: 7px;
}
.nav-links { display: flex; align-items: center; gap: 1rem; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: .9rem; font-weight: 630;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links .lab-link { color: var(--accent); }
.theme-toggle {
  width: 2.35rem; height: 2.35rem; cursor: pointer;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--line); border-radius: 999px;
}
.nav-toggle { display: none; border: 0; background: none; padding: .5rem; }
.nav-toggle span { display: block; width: 1.4rem; height: 2px; margin: 5px; background: var(--text); }

main { position: relative; max-width: var(--max); margin: auto; padding: 3.5rem 1.25rem 7rem; }
.hero {
  position: relative; min-height: 650px; display: grid; align-content: center;
  padding: 5rem 0 4rem;
}
.hero.compact { min-height: auto; max-width: 920px; padding: 5rem 0 3rem; }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr);
  align-items: center; gap: 4rem;
}
.eyebrow {
  margin: 0 0 .9rem; color: var(--accent); font: 760 .75rem var(--mono);
  letter-spacing: .16em; text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.08; letter-spacing: -.045em; }
h1 { max-width: 980px; margin: 0 0 1.35rem; font-size: clamp(3.25rem, 7vw, 6.85rem); }
h2 { margin: 0 0 1rem; font-size: clamp(2.15rem, 4.4vw, 3.55rem); }
h3 { margin: 0 0 .7rem; font-size: 1.32rem; }
.gradient-text {
  color: transparent;
  background: linear-gradient(105deg, var(--text) 10%, var(--accent) 58%, var(--accent-2));
  background-clip: text; -webkit-background-clip: text;
}
.lead { max-width: 810px; margin: 0; color: var(--muted); font-size: clamp(1.12rem, 2vw, 1.42rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  min-height: 44px; padding: .78rem 1.12rem;
  font-weight: 760; text-decoration: none;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface); transition: .18s ease;
}
.button:hover { transform: translateY(-2px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.button.primary { color: #06100e; background: var(--accent); border-color: var(--accent); }
.button.ghost { background: transparent; }

.runtime-panel {
  position: relative; overflow: hidden; min-height: 390px;
  padding: 1.4rem; border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(20,31,44,.86), rgba(8,14,21,.78));
  box-shadow: var(--shadow);
}
[data-theme="light"] .runtime-panel { background: linear-gradient(150deg, #fff, #eaf0f6); }
.runtime-panel::before {
  content: ""; position: absolute; width: 220px; height: 220px; right: -60px; top: -70px;
  border-radius: 50%; background: rgba(45,212,191,.13); filter: blur(35px);
}
.panel-top { display: flex; justify-content: space-between; color: var(--muted); font: .72rem var(--mono); }
.status { color: var(--accent); }
.pipeline { display: grid; gap: .65rem; margin-top: 2rem; }
.pipeline-node {
  position: relative; padding: .8rem 1rem; font: .8rem var(--mono);
  border: 1px solid var(--line); border-radius: 10px; background: var(--surface);
}
.pipeline-node.active { border-color: var(--accent); box-shadow: 0 0 22px rgba(45,212,191,.12); }
.pipeline-node:not(:last-child)::after {
  content: "↓"; position: absolute; left: 50%; bottom: -.72rem; color: var(--dim);
}
.latency-readout {
  display: flex; align-items: baseline; gap: .5rem; margin-top: 2rem;
  color: var(--accent);
}
.latency-readout strong { font-size: 3.1rem; letter-spacing: -.07em; }
.latency-readout span { color: var(--muted); font: .8rem var(--mono); }

.signal-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); box-shadow: inset 0 1px rgba(255,255,255,.03);
}
.signal { padding: 1.35rem; border-right: 1px solid var(--line); }
.signal:last-child { border-right: 0; }
.signal strong { display: block; color: var(--accent); font-size: 1.75rem; letter-spacing: -.05em; }
.signal span { color: var(--muted); font-size: .88rem; }

.section { padding: 5rem 0; border-top: 1px solid var(--line); }
.section-heading {
  display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 2rem;
}
.section-heading > p { max-width: 620px; margin: 0; color: var(--muted); }
.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0,1fr)); }

.card {
  position: relative; overflow: hidden; padding: 1.45rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, var(--surface), color-mix(in srgb, var(--surface) 65%, transparent));
  box-shadow: inset 0 1px rgba(255,255,255,.025);
  transition: transform .2s ease, border-color .2s ease;
}
a.card { text-decoration: none; }
.card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.card::after {
  content: ""; position: absolute; width: 120px; height: 120px; right: -60px; bottom: -70px;
  border-radius: 50%; background: color-mix(in srgb, var(--accent) 10%, transparent); filter: blur(18px);
}
.card p { color: var(--muted); }
.card .meta { color: var(--accent); font: .72rem var(--mono); letter-spacing: .08em; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1rem; }
.tag {
  padding: .25rem .55rem; color: var(--muted); font: .7rem var(--mono);
  border: 1px solid var(--line); border-radius: 999px;
}
.icon-card .icon {
  display: grid; place-items: center; width: 2.65rem; height: 2.65rem; margin-bottom: 1.2rem;
  color: var(--accent); font: 700 .75rem var(--mono);
  border: 1px solid var(--line-strong); border-radius: 11px;
}

.prose { max-width: var(--reading); }
.prose h1 { font-size: clamp(3rem, 6vw, 5.5rem); }
.prose h2 { margin-top: 3.2rem; font-size: 2rem; }
.prose h3 { margin-top: 2.1rem; }
.prose p, .prose li { color: var(--muted); font-size: 1.03rem; }
.prose strong { color: var(--text); }
.prose a { color: var(--accent); }
.prose blockquote {
  margin: 2rem 0; padding: 1rem 1.3rem;
  border-left: 3px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--surface);
}
.prose code { padding: .15rem .35rem; font-family: var(--mono); border-radius: 5px; background: var(--surface-2); }
pre {
  overflow: auto; padding: 1.25rem; color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius); background: #05090d;
}
.callout {
  margin: 2rem 0; padding: 1.2rem 1.35rem;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
}

.lab-shell {
  display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 1rem;
}
.lab-nav {
  position: sticky; top: 5.5rem; align-self: start; padding: .75rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface);
}
.lab-nav button {
  width: 100%; padding: .75rem; color: var(--muted); text-align: left; cursor: pointer;
  border: 0; border-radius: 10px; background: transparent;
}
.lab-nav button.active { color: var(--text); background: var(--surface-2); }
.lab-stage {
  min-height: 560px; padding: 1.5rem;
  border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface);
}
.lab-view { display: none; }
.lab-view.active { display: block; animation: fade-in .24s ease; }
@keyframes fade-in { from { opacity: 0; transform: translateY(4px); } }

.cpu-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1rem; margin: 2rem 0; }
.cpu {
  position: relative; min-height: 160px; padding: 1rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-solid);
}
.cpu-label { color: var(--accent); font: .76rem var(--mono); }
.cache-line {
  display: grid; grid-template-columns: repeat(8,1fr); gap: 4px; margin-top: 2rem;
}
.cache-cell { height: 34px; border-radius: 6px; background: var(--surface-2); }
.cache-cell.hot { background: var(--accent); box-shadow: 0 0 22px rgba(45,212,191,.24); }
.coherence-bus {
  height: 4px; margin: 1rem 12%; border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .35;
}
.coherence-bus.pulse { animation: bus-pulse .65s ease; }
@keyframes bus-pulse { 50% { opacity: 1; box-shadow: 0 0 20px var(--accent); } }

.ring {
  position: relative; width: min(430px, 82vw); aspect-ratio: 1; margin: 2rem auto;
  border: 1px solid var(--line); border-radius: 50%;
}
.slot {
  position: absolute; left: 50%; top: 50%; width: 52px; height: 52px; margin: -26px;
  display: grid; place-items: center; font: .72rem var(--mono);
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface-solid);
  transform: rotate(var(--angle)) translateY(-175px) rotate(calc(-1 * var(--angle)));
}
.slot.filled { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 18%, var(--surface)); }
.ring-center { position: absolute; inset: 38%; display: grid; place-items: center; text-align: center; color: var(--muted); }
.ring-controls, .control-row { display: flex; flex-wrap: wrap; gap: .7rem; align-items: center; }
.control {
  padding: .65rem .9rem; color: var(--text); cursor: pointer;
  border: 1px solid var(--line); border-radius: 999px; background: var(--surface-solid);
}
.control:hover { border-color: var(--line-strong); }
.control.primary { color: #06100e; background: var(--accent); border-color: var(--accent); }
.counter { color: var(--accent); font: .78rem var(--mono); }

.jit-flow { display: grid; grid-template-columns: repeat(5,1fr); gap: .65rem; margin: 2rem 0; }
.jit-node {
  padding: 1rem .7rem; color: var(--muted); text-align: center; font: .75rem var(--mono);
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface-solid);
}
.jit-node.active { color: var(--text); border-color: var(--accent); box-shadow: 0 0 20px rgba(45,212,191,.12); }

.academy-map { display: grid; gap: 1rem; }
.level {
  display: grid; grid-template-columns: 120px 1fr; gap: 1.2rem; padding: 1.4rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
}
.level-no { color: var(--accent); font: 700 .8rem var(--mono); }
.level ul { margin: .6rem 0 0; columns: 2; color: var(--muted); }

.timeline { display: grid; gap: 1rem; }
.timeline-item {
  display: grid; grid-template-columns: 170px 1fr; gap: 1.5rem;
  padding-top: 1.5rem; border-top: 1px solid var(--line);
}
.timeline-item time { color: var(--accent); font: .78rem var(--mono); }
.metric { color: var(--accent); font-size: clamp(2.3rem,5vw,4rem); font-weight: 850; letter-spacing: -.065em; }
.metric-label { color: var(--muted); }

.site-footer {
  display: grid; grid-template-columns: 1fr auto; gap: 2rem;
  max-width: var(--max); margin: auto; padding: 2.8rem 1.25rem 4rem;
  color: var(--muted); border-top: 1px solid var(--line);
}
.site-footer strong { color: var(--text); }
.site-footer p { margin: .3rem 0; }
.footer-links { display: flex; gap: 1rem; }
.footer-note { grid-column: 1/-1; font-size: .8rem; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 940px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 4.5rem; left: 1rem; right: 1rem;
    flex-direction: column; align-items: stretch; padding: 1rem;
    border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-solid);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .hero-grid { grid-template-columns: 1fr; }
  .runtime-panel { max-width: 620px; }
  .grid.four, .grid.three { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .lab-shell { grid-template-columns: 1fr; }
  .lab-nav { position: static; display: flex; overflow-x: auto; }
  .lab-nav button { width: auto; white-space: nowrap; }
  .jit-flow { grid-template-columns: 1fr; }
}
@media (max-width: 650px) {
  main { padding-top: 2rem; }
  .hero { min-height: auto; padding: 3.5rem 0; }
  h1 { font-size: 3.15rem; }
  .grid.two, .grid.three, .grid.four, .signal-strip, .cpu-grid { grid-template-columns: 1fr; }
  .signal { border-right: 0; border-bottom: 1px solid var(--line); }
  .section-heading { display: block; }
  .timeline-item, .level { grid-template-columns: 1fr; }
  .level ul { columns: 1; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-note { grid-column: auto; }
  .slot { transform: rotate(var(--angle)) translateY(-122px) rotate(calc(-1 * var(--angle))); width: 44px; height: 44px; margin: -22px; }
}