:root {
  --bg: #0b0a14;
  --bg-glow: #2a1f6b;
  --text: #f1effa;
  --muted: #a9a4c2;
  --accent: #7c5cff;
  --accent-text: #ffffff;
  --card: #15132a;
  --line: #2a2748;
  --radius: 14px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f5fb;
    --bg-glow: #d9d1ff;
    --text: #17142b;
    --muted: #5d587a;
    --card: #ffffff;
    --line: #e2dff0;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 75% 10%, var(--bg-glow), transparent 60%), var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.nav,
main,
.footer {
  max-width: 1160px;
  margin: 0 auto;
  padding-inline: 16px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: 20px;
}

.nav__brand {
  font-weight: 700;
  text-decoration: none;
}

.nav__link {
  color: var(--muted);
  text-decoration: none;
}

.nav__link:hover {
  color: var(--text);
}

/* ---- hero ---- */

.hero {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: 8px;
  padding-block: 24px 48px;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    min-height: min(78vh, 720px);
  }
}

.hero__eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
}

.hero__title {
  margin: 0;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero__lead {
  max-width: 34em;
  color: var(--muted);
  font-size: clamp(16px, 1.6vw, 18px);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

.button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* ---- 3D stage ----
   The poster and the canvas share one square box, so swapping them never
   shifts the layout (no CLS). */

.hero-3d {
  position: relative;
  width: 100%;
  max-width: min(560px, 88vw);
  aspect-ratio: 1 / 1;
  justify-self: center;
}

.hero-3d__poster,
.hero-3d__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-3d__poster {
  object-fit: contain;
  transition: opacity 0.6s ease;
}

.hero-3d__canvas {
  opacity: 0;
  transition: opacity 0.6s ease;
  touch-action: pan-y; /* never block page scrolling on phones */
}

.hero-3d[data-state='ready'] .hero-3d__canvas {
  opacity: 1;
}

.hero-3d[data-state='ready'] .hero-3d__poster {
  opacity: 0;
}

.hero-3d__debug {
  position: absolute;
  left: 8px;
  bottom: 8px;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgb(0 0 0 / 0.6);
  color: #fff;
  font: 12px/1.4 ui-monospace, monospace;
}

@media (prefers-reduced-motion: reduce) {
  .hero-3d__poster,
  .hero-3d__canvas,
  .button {
    transition: none;
  }
}

/* ---- features ---- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  padding-bottom: 56px;
}

.features article {
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.features h2 {
  margin: 0 0 6px;
  font-size: 17px;
}

.features p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.footer {
  padding-block: 24px 40px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--line);
}