:root {
  --bg: #05060b;
  --bg-2: #090b14;
  --ink: #eceef7;
  --muted: #9aa0b8;
  --faint: #5b6180;
  --violet: #8b5cf6;
  --cyan: #22d3ee;
  --line: rgba(160, 170, 220, 0.12);
  --card: rgba(140, 150, 210, 0.04);
  --max: 1080px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: radial-gradient(1200px 800px at 70% -10%, #12142a 0%, var(--bg) 55%) fixed, var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* The brain sits behind everything, fixed — ambient only (not interactive). */
#brain-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  display: block;
  pointer-events: none;
}

.nav, .hero, main, .footer { position: relative; z-index: 1; }

/* ---------- Nav ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 26px 28px;
}
.brand-mark {
  font-weight: 800;
  letter-spacing: 0.32em;
  font-size: 15px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-mark.small { letter-spacing: 0.28em; font-size: 13px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: color 0.25s var(--ease);
}
.nav-links a:hover { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px;
}
.hero-inner { max-width: 780px; }
.eyebrow {
  color: var(--faint);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  font-size: 11px;
  margin-bottom: 26px;
}
.title {
  font-size: clamp(72px, 16vw, 190px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 0%, #b9c0ea 60%, #6a71a8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 22px;
}
.tagline {
  font-size: clamp(20px, 3.4vw, 30px);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 18px;
}
.tagline em { font-style: italic; color: var(--cyan); }
.sub {
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
  max-width: 560px;
  margin: 0 auto 42px;
}
.scroll-cue {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 12px 22px;
  border-radius: 999px;
  transition: all 0.3s var(--ease);
  display: inline-block;
}
.scroll-cue:hover { color: var(--ink); border-color: rgba(160,170,220,0.35); transform: translateY(-2px); }

/* ---------- Sections ---------- */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 120px 28px;
}
.kicker {
  color: var(--cyan);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font-size: 12px;
  margin-bottom: 18px;
}
.section h2 {
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 720px;
  margin-bottom: 26px;
}
.lead {
  color: var(--muted);
  font-size: clamp(16px, 2.2vw, 20px);
  max-width: 680px;
  margin-bottom: 22px;
}
.lead em { color: var(--ink); font-style: italic; }

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 48px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(6px);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.4);
  background: rgba(139, 92, 246, 0.06);
}
.card h3 {
  font-size: 19px;
  font-weight: 650;
  margin-bottom: 12px;
}
.card p { color: var(--muted); font-size: 15px; }
.card em { color: var(--cyan); font-style: normal; }

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 18px;
  margin: 48px 0;
}
.stat {
  text-align: center;
  padding: 30px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
}
.stat-num {
  display: block;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 800;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
}
.stat-label {
  display: block;
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 8px;
}

/* ---------- Footer ---------- */
.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 60px 28px 80px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  text-align: center;
}
.foot-note { color: var(--faint); font-size: 13px; letter-spacing: 0.04em; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.card.reveal { transition-delay: 0.05s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 620px) {
  .nav-links { gap: 18px; }
  .section { padding: 90px 22px; }
}

/* ---------- interactive brain: legend + region panel ---------- */
.brain-hint { color: var(--faint); font-size: 13px; letter-spacing: 0.06em; margin: 36px 0 16px; }
.region-legend { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; max-width: 640px; margin: 0 auto; }
.region-legend button {
  --dot: var(--violet);
  background: rgba(140, 150, 210, 0.05); color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 15px 9px 28px; font-size: 13px; cursor: pointer; position: relative;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.region-legend button::before {
  content: ""; position: absolute; left: 13px; top: 50%; transform: translateY(-50%);
  width: 8px; height: 8px; border-radius: 50%; background: var(--dot); box-shadow: 0 0 9px var(--dot);
}
.region-legend button:hover { color: var(--ink); border-color: rgba(160, 170, 220, 0.4); }
.region-legend button.active { color: var(--ink); background: rgba(139, 92, 246, 0.14); border-color: var(--dot); }

.region-panel {
  position: fixed; top: 50%; right: 28px; transform: translate(120%, -50%);
  width: min(374px, calc(100vw - 40px)); z-index: 5;
  background: rgba(9, 10, 19, 0.84); backdrop-filter: blur(16px);
  border: 1px solid var(--line); border-radius: 20px; padding: 32px;
  opacity: 0; pointer-events: none;
  transition: transform 0.6s var(--ease), opacity 0.5s var(--ease);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.55);
}
.region-panel.open { transform: translate(0, -50%); opacity: 1; pointer-events: auto; }
.panel-close {
  position: absolute; top: 16px; right: 20px; background: none; border: none;
  color: var(--faint); font-size: 24px; cursor: pointer; line-height: 1; transition: color 0.2s;
}
.panel-close:hover { color: var(--ink); }
.panel-region { font-size: 12px; letter-spacing: 0.22em; text-transform: uppercase; margin-bottom: 8px; font-weight: 700; }
.panel-faculty { font-size: 25px; font-weight: 700; margin-bottom: 14px; color: var(--ink); letter-spacing: -0.01em; }
.panel-body { color: var(--muted); font-size: 15px; margin-bottom: 20px; }
.panel-caps { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.panel-caps li { color: var(--ink); font-size: 14px; padding-left: 22px; position: relative; }
.panel-caps li::before { content: "\2192"; position: absolute; left: 0; color: var(--cyan); }

@media (max-width: 720px) {
  .region-panel {
    top: auto; bottom: 16px; left: 50%; right: auto; transform: translate(-50%, 150%);
    width: calc(100vw - 28px); padding: 24px 22px; border-radius: 18px;
  }
  .region-panel.open { transform: translate(-50%, 0); }
  .panel-faculty { font-size: 22px; }
}

/* ---------- the 3D brain model box ---------- */
.model-stage {
  position: relative;
  margin: 42px auto 0;
  width: 100%;
  height: min(64vh, 560px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: radial-gradient(120% 120% at 50% 18%, rgba(70, 56, 120, 0.20), rgba(9, 10, 20, 0.62));
  overflow: hidden;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.45), inset 0 0 70px rgba(90, 70, 160, 0.09);
}
#model-canvas { display: block; width: 100%; height: 100%; cursor: grab; touch-action: none; }
#model-canvas:active { cursor: grabbing; }
.model-loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 14px; letter-spacing: 0.12em; pointer-events: none;
}
.model-panel {
  position: absolute; top: 20px; left: 20px; width: min(320px, calc(100% - 40px));
  background: rgba(9, 10, 19, 0.84); backdrop-filter: blur(14px);
  border: 1px solid var(--line); border-radius: 16px; padding: 22px 24px;
  opacity: 0; transform: translateY(-8px); pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}
.model-panel.open { opacity: 1; transform: none; pointer-events: auto; }
.model-panel .panel-faculty { font-size: 21px; }
.model-hint { color: var(--faint); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; margin-top: 16px; text-align: center; }

@media (max-width: 620px) {
  .model-stage { height: 62vh; border-radius: 18px; }
  .model-panel { top: 12px; left: 12px; right: 12px; width: auto; padding: 18px 18px; }
}