/* Brainscend — shared design system */
:root {
  --bg: #F6F5F1;
  --bg-2: #ECEAE2;
  --bg-3: #E1DED3;
  --fg: #0A0A0B;
  --fg-2: #3B3B3D;
  --fg-3: #6B6B6F;
  --line: #D8D5C9;
  --accent: oklch(0.72 0.18 45);
  --accent-ink: #1a0d05;
  --card: #ffffff;
  --grid: rgba(10, 10, 11, 0.06);
  --dot: rgba(10, 10, 11, 0.18);
  --shadow: 0 1px 0 rgba(10,10,11,0.04), 0 24px 40px -24px rgba(10,10,11,0.18);
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #0A0A0B;
  --bg-2: #111113;
  --bg-3: #17171A;
  --fg: #F2F0E9;
  --fg-2: #B7B5AE;
  --fg-3: #7A7A80;
  --line: #26262A;
  --accent: oklch(0.74 0.18 45);
  --accent-ink: #0A0A0B;
  --card: #0F0F11;
  --grid: rgba(242, 240, 233, 0.06);
  --dot: rgba(242, 240, 233, 0.22);
  --shadow: 0 1px 0 rgba(0,0,0,0.4), 0 32px 60px -28px rgba(0,0,0,0.6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  font-feature-settings: "ss01", "ss02";
  -webkit-font-smoothing: antialiased;
  transition: background 300ms ease, color 300ms ease;
}
body { overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--accent); color: var(--accent-ink); }

.mono { font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace; }

/* layout primitives */
.container {
  width: 100%;
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) { .container { padding: 0 20px; } }

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

.h-display {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.95;
  font-size: clamp(34px, 5vw, 80px);
  margin: 0;
}
.h-section {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
  font-size: clamp(26px, 3.5vw, 52px);
  margin: 0;
}
.h-sub {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(18px, 2vw, 26px);
  margin: 0;
}
.text-body {
  font-size: 17px;
  line-height: 1.55;
  color: var(--fg-2);
}
.text-small {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-3);
}

/* Nav */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 60;
  padding: 18px 0;
  backdrop-filter: blur(14px);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background 200ms ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--fg-2);
  transition: color 150ms ease, background 150ms ease;
  position: relative;
}
.nav-link:hover { color: var(--fg); background: var(--bg-2); }
.nav-link.active { color: var(--fg); }
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 2px; left: 14px; right: 14px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
@media (max-width: 900px) {
  .nav-links { display: none; }
}

/* Nav dropdown */
.nav-dropdown-wrap {
  position: relative;
}
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
  transform: translateX(-50%) translateY(-6px);
  z-index: 100;
}
.nav-dropdown-wrap:hover .nav-dropdown,
.nav-dropdown-wrap:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--fg-2);
  transition: background 150ms, color 150ms;
  white-space: nowrap;
}
.nav-dropdown a:hover {
  background: var(--bg-2);
  color: var(--fg);
}
.nav-dropdown a .dd-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 18px;
}

/* Brand mark — iso-cube */
.iso-mark {
  --s: 32px;
  width: var(--s);
  height: var(--s);
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(55deg) rotateZ(-45deg);
  flex-shrink: 0;
}
.iso-mark .face {
  position: absolute;
  inset: 0;
  background: var(--fg);
}
.iso-mark .top { background: var(--accent); transform: translateZ(calc(var(--s) / 2)); }
.iso-mark .left { background: color-mix(in oklab, var(--accent) 55%, black); transform: rotateY(-90deg) translateZ(calc(var(--s) / 2)); width: var(--s); height: var(--s); }
.iso-mark .right { background: color-mix(in oklab, var(--accent) 70%, black); transform: rotateX(-90deg) translateZ(calc(var(--s) / 2)); }
html[data-theme="dark"] .iso-mark .left { background: color-mix(in oklab, var(--accent) 65%, black); }
html[data-theme="dark"] .iso-mark .right { background: color-mix(in oklab, var(--accent) 80%, black); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
  will-change: transform;
}
.btn:hover { transform: translateY(-1px); border-color: var(--fg); }
.btn-primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn-primary:hover { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-accent {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.btn-ghost { background: transparent; }
.btn .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent);
}
.btn-primary .dot { background: var(--bg); box-shadow: 0 0 0 4px color-mix(in oklab, var(--bg) 25%, transparent); }

.icon-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--card);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--fg);
  transition: background 150ms ease, border-color 150ms ease;
}
.icon-btn:hover { border-color: var(--fg); }

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 80px 0 40px;
  margin-top: 120px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 80px;
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-col h4 {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  margin: 0 0 20px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--fg-2); font-size: 15px; transition: color 150ms; }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 24px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.footer-word {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  letter-spacing: -0.04em;
  font-size: clamp(60px, 14vw, 220px);
  line-height: 0.8;
  color: var(--fg);
  margin: 40px 0 0;
  white-space: nowrap;
  overflow: hidden;
}
.footer-word .accent { color: var(--accent); }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px;
  transition: border-color 200ms ease, transform 200ms ease;
}
.card:hover { border-color: var(--fg); }

/* Section */
.section { padding: 120px 0; }
@media (max-width: 720px) { .section { padding: 80px 0; } }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 60px;
  flex-wrap: wrap;
}

/* Marquee */
.marquee {
  display: flex;
  gap: 60px;
  animation: marquee 40s linear infinite;
  white-space: nowrap;
  width: max-content;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 700ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.in { opacity: 1; transform: none; }

/* Cursor-reactive canvas */
.cursor-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* Grid background */
.bg-grid {
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px;
}

/* Dot halftone */
.bg-dots {
  background-image: radial-gradient(var(--dot) 1px, transparent 1.2px);
  background-size: 24px 24px;
}

/* Ticker row */
.ticker {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  padding: 18px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.ticker .dot-sep { color: var(--accent); }

/* Page header */
.page-hero {
  padding: 160px 0 80px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.page-hero h1 { margin-top: 16px; }
.page-hero p { max-width: 640px; margin-top: 24px; }

/* Tag */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-2);
}

/* 404 / broken state avoided — all links internal */

/* Scrollbar (subtle) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-3); }
::-webkit-scrollbar-track { background: transparent; }

/* Utility */
.stack { display: flex; flex-direction: column; }
.row { display: flex; align-items: center; }
.gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-24 { gap: 24px; }
.between { justify-content: space-between; }
.muted { color: var(--fg-3); }
.accent { color: var(--accent); }