/* ══════════════════════════════════════════════════════════════════════════
   BXD Inference — page layer.
   Consumes the Nocturne design system (assets/nocturne.css). Every color,
   font, space and radius below comes from a Nocturne token; no raw hexes.
   Ported from the Claude Design prototype's inline <style> block.
   ══════════════════════════════════════════════════════════════════════ */

html, body { margin: 0; height: 100%; background: var(--color-bg); }
* { box-sizing: border-box; }
a { color: var(--color-accent-300); text-decoration: none; }
a:hover { color: var(--color-accent); }

/* — deck scaffolding — */
.slides {
  height: 100vh;
  height: 100dvh;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}
.slide {
  min-height: 100vh;
  min-height: 100dvh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--space-8) * 3) 0 calc(var(--space-8) * 2);
}
/* The dot grid: a Nocturne-flavoured ground, painted from --color-text so it
   tracks the theme rather than a hard-coded value. */
.slide::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image: radial-gradient(color-mix(in srgb, var(--color-text) 10%, transparent) 1px, transparent 1px);
  background-size: 42px 42px; opacity: 0.35;
}

/* Per-section gradient depth. Origin alternates side to side down the deck so
   consecutive slides don't read as the same plate. */
#facility {
  background:
    radial-gradient(900px 620px at 88% -8%, color-mix(in srgb, var(--color-accent-900) 60%, transparent), transparent 62%),
    radial-gradient(700px 500px at -8% 108%, color-mix(in srgb, black 30%, transparent), transparent 55%);
}
#models {
  background:
    radial-gradient(820px 560px at -6% -12%, color-mix(in srgb, var(--color-accent-900) 48%, transparent), transparent 60%),
    radial-gradient(700px 520px at 106% 106%, color-mix(in srgb, black 28%, transparent), transparent 55%);
}
#usecases {
  background:
    radial-gradient(860px 580px at 104% 104%, color-mix(in srgb, var(--color-accent-900) 55%, transparent), transparent 62%),
    radial-gradient(600px 420px at -4% -8%, color-mix(in srgb, black 26%, transparent), transparent 55%);
}
#developers {
  background:
    radial-gradient(860px 580px at -4% -6%, color-mix(in srgb, var(--color-accent-900) 52%, transparent), transparent 62%),
    radial-gradient(620px 440px at 106% 108%, color-mix(in srgb, black 26%, transparent), transparent 55%);
}
/* The one saturated ground in the deck — Nocturne's "saturation as presence"
   exception, reserved for the closing slide. */
#contact {
  background:
    radial-gradient(1100px 700px at 50% 130%, color-mix(in srgb, var(--color-section-glow) 65%, transparent), transparent 60%),
    var(--color-section);
}
#contact::after { opacity: 0.18; }

.wrap {
  max-width: 1200px; margin: 0 auto;
  padding: 0 clamp(24px, 6vw, 80px);
  width: 100%; position: relative; z-index: 1;
}

/* — top bar — */
.topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) clamp(24px, 6vw, 80px);
  background: linear-gradient(to bottom, color-mix(in srgb, var(--color-bg) 75%, transparent), transparent);
}
.topnav-links { display: flex; gap: var(--space-4); align-items: center; }
.topnav-links a { font-size: 14px; color: color-mix(in srgb, var(--color-text) 78%, transparent); }
.topnav-links a:hover { color: var(--color-text); }
.brand {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 16px; letter-spacing: -0.01em; color: var(--color-text);
  display: inline-flex; align-items: center; gap: var(--space-2);
}
.brand:hover { color: var(--color-text); }
.brand-mark { width: 10px; height: 10px; flex: none; border: 1px solid var(--color-accent); border-radius: 2px; }
.brand-mark::after {
  content: ""; display: block; width: 4px; height: 4px; margin: 2px;
  background: var(--color-accent);
}

/* — section dot nav — */
.dotnav {
  position: fixed; right: clamp(16px, 3vw, 36px); top: 50%;
  transform: translateY(-50%); z-index: 20;
  display: flex; flex-direction: column; gap: 14px;
}
.dotnav .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-neutral-600);
  border: 0; padding: 0; cursor: pointer; display: block;
  transition: background 0.2s, transform 0.2s;
}
.dotnav .dot:hover { background: var(--color-accent-400); }
.dotnav .dot.active { background: var(--color-accent); transform: scale(1.3); }

/* — shared type — */
.kicker {
  position: relative; display: inline-block;
  font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--color-accent); font-feature-settings: "tnum" 1;
  margin: 0 0 var(--space-4); padding-left: 56px;
}
.kicker::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 44px; height: 1px; background: var(--color-accent);
}
.display {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: clamp(40px, 6vw, 76px); line-height: 1.1; letter-spacing: -0.015em;
  margin: 0; color: var(--color-text); position: relative; z-index: 2;
}
.display .line { display: block; }
.display-sm { font-size: clamp(32px, 4.4vw, 52px); }

/* — hero — */
.hero-graphic {
  position: absolute; right: 0; top: 0; bottom: 0; width: 62%;
  z-index: 0; pointer-events: none;
  -webkit-mask-image: linear-gradient(to right, transparent, black 30%);
  mask-image: linear-gradient(to right, transparent, black 30%);
}
.hero-sub {
  position: relative; z-index: 2;
  font-size: 18px; line-height: 1.6; max-width: 58ch;
  margin: var(--space-4) 0 0;
  color: color-mix(in srgb, var(--color-text) 85%, transparent);
}
.hero-row {
  position: relative; z-index: 2;
  display: flex; gap: var(--space-3); flex-wrap: wrap;
  margin-top: var(--space-6);
}
.hero-stats {
  position: relative; z-index: 2;
  display: flex; gap: clamp(24px, 4vw, 56px); flex-wrap: wrap;
  margin-top: var(--space-4); padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider); max-width: 720px;
}
.hero-stats .item { display: flex; flex-direction: column; gap: 4px; }
.hero-stats .num {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 22px; color: var(--color-text); font-feature-settings: "tnum" 1;
}
.hero-stats .lbl {
  font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 58%, transparent);
}
.scrolldown {
  position: absolute; bottom: var(--space-6); left: 0; right: 0;
  display: flex; justify-content: center; z-index: 2;
}
.scrolldown span {
  font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
}

/* — hero SVG animation — */
@keyframes vpGlow { 0%, 100% { opacity: 0.5; } 50% { opacity: 0.85; } }
@keyframes ledBlink { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes rackPowerOn {
  0% { opacity: 0; filter: brightness(0.4); }
  55% { opacity: 1; filter: brightness(1.9); }
  100% { opacity: 1; filter: brightness(1); }
}

/* — facility — */
.facility-grid {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  gap: clamp(24px, 5vw, 72px); align-items: start;
}
.facility-copy { font-size: 15.5px; line-height: 1.6; max-width: 52ch; margin: var(--space-4) 0 0;
  color: color-mix(in srgb, var(--color-text) 78%, transparent); }
.spec-list { list-style: none; margin: var(--space-6) 0 0; padding: 0; display: grid; gap: var(--space-4); }
.spec-list li { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: var(--space-3); align-items: baseline; }
.spec-list .spec-num {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 12px; color: var(--color-accent); font-feature-settings: "tnum" 1;
}
.spec-list h3 {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 15px; margin: 0 0 2px; color: var(--color-text);
}
.spec-list p { font-size: 14px; line-height: 1.55; margin: 0; max-width: 46ch;
  color: color-mix(in srgb, var(--color-text) 72%, transparent); }
.spec-table-title {
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 58%, transparent);
  margin: 0 0 var(--space-3);
}
.table td.spec-val { text-align: right; font-feature-settings: "tnum" 1; color: var(--color-text); }
.table td.spec-key { color: color-mix(in srgb, var(--color-text) 70%, transparent); }

/* — models + use cases — */
.models-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px); align-items: start;
}
.models-col h3 {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 17px; margin: 0 0 var(--space-2); color: var(--color-text);
}
.models-col p { font-size: 15px; line-height: 1.6; margin: 0;
  color: color-mix(in srgb, var(--color-text) 74%, transparent); }
.tag-cloud { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }

/* — developers — */
.dev-grid {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(24px, 5vw, 72px); align-items: center;
}
.code-card {
  background: var(--color-neutral-800);
  border: 1px solid var(--color-neutral-700);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
}
.code-card pre {
  margin: 0; font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13.5px; line-height: 1.65;
  color: color-mix(in srgb, var(--color-text) 90%, transparent);
}
.code-card .tok-key { color: var(--color-accent-300); }
.code-card .tok-str { color: color-mix(in srgb, var(--color-text) 55%, transparent); }
.dev-copy-title { margin-bottom: var(--space-3); }
.dev-points { list-style: none; margin: var(--space-6) 0 0; padding: 0; display: grid; gap: var(--space-2); }
.dev-points li {
  position: relative; padding-left: var(--space-6); font-size: 14px; line-height: 1.55;
  color: color-mix(in srgb, var(--color-text) 74%, transparent);
}
.dev-points li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 8px; height: 1px; background: var(--color-accent);
}

/* — use cases — */
.feature {
  display: grid; grid-template-columns: 80px minmax(0, 300px) minmax(0, 1fr);
  gap: var(--space-4) clamp(24px, 4vw, 64px);
  align-items: baseline; padding: var(--space-4) 0;
}
.feature + .feature { position: relative; }
/* Nocturne's fading rule, at row scale. */
.feature + .feature::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(to right, transparent, var(--color-neutral-700) 48px calc(100% - 48px), transparent);
}
.f-num {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 15px; color: var(--color-accent); font-feature-settings: "tnum" 1; margin: 0;
}
.f-title {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 24px; letter-spacing: -0.01em; margin: 0; color: var(--color-text);
}
.f-copy { font-size: 15.5px; line-height: 1.6; margin: 0; max-width: 56ch;
  color: color-mix(in srgb, var(--color-text) 78%, transparent); }

/* — contact — */
.close-sub {
  font-size: 16px; line-height: 1.6; max-width: 52ch; margin: var(--space-4) 0 0;
  color: color-mix(in srgb, var(--color-text) 78%, transparent);
}
.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  gap: var(--space-6) clamp(24px, 3vw, 44px);
  margin-top: var(--space-8); padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.contact-item { display: flex; flex-direction: column; gap: var(--space-2); }
.contact-item address { font-style: normal; margin: 0; }
.contact-label {
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 58%, transparent);
}
.contact-value {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 17px; line-height: 1.35; color: var(--color-text);
  font-feature-settings: "tnum" 1;
}
a.contact-value:hover { color: var(--color-accent); }
/* The registered office runs to three long lines — step it down so it doesn't
   outweigh the phone and email it sits beside. */
.contact-value-sm { font-size: 14px; line-height: 1.45; }
.contact-note { font-size: 13px; line-height: 1.5;
  color: color-mix(in srgb, var(--color-text) 62%, transparent); }
.contact-row { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-8); }

footer {
  position: absolute; bottom: var(--space-4); left: 0; right: 0;
  text-align: center; font-size: 12.5px; line-height: 1.65; z-index: 1;
  padding: 0 clamp(24px, 6vw, 80px);
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
}

/* — responsive — */
@media (max-height: 760px) { .scrolldown { display: none; } }
@media (max-width: 900px) { .hero-graphic { display: none; } }
@media (max-width: 820px) {
  /* Mandatory snapping fights content taller than the viewport on a phone;
     release it and let the slides flow. */
  .slides { scroll-snap-type: none; }
  .slide { scroll-snap-stop: normal; padding: calc(var(--space-8) * 3.5) 0 calc(var(--space-8) * 3); }
  .feature { grid-template-columns: 1fr; gap: var(--space-2); }
  .models-grid, .facility-grid, .dev-grid { grid-template-columns: 1fr; }
  .topnav-links { display: none; }
  .hero-stats { gap: var(--space-4); }
  .dotnav { display: none; }
  footer { position: static; margin-top: var(--space-8); }
}

@media (prefers-reduced-motion: reduce) {
  .slides { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}