/* Threenity landing — v1. Neutral dark default, single accent gradient. */

:root {
  --bg: #0d0d0d;
  --bg-soft: #141417;
  --surface: #17171c;
  --border: #26262e;
  --fg: #f5f5f7;
  --fg-dim: #a1a1ac;
  --fg-faint: #6b6b76;
  --accent-1: #8052ff;
  --accent-2: #3399ff;
  --accent-3: #00ccff;
  --accent: var(--accent-2);
  --radius: 14px;
  --maxw: 1080px;
  --grad: linear-gradient(120deg, var(--accent-1), var(--accent-2) 55%, var(--accent-3));
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-3); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 13, 13, 0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--fg); }
.brand img { width: 28px; height: 28px; }
.brand:hover { text-decoration: none; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--fg-dim); font-size: 15px; }
.nav-links a:hover { color: var(--fg); text-decoration: none; }
.nav-links .muted { color: var(--fg-faint); cursor: not-allowed; }
.nav-links .muted:hover { color: var(--fg-faint); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.18s ease, border-color 0.18s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--grad); color: #fff; }
.btn-primary:hover { color: #fff; }
.btn-ghost { background: var(--surface); color: var(--fg); border-color: var(--border); }
.btn-ghost:hover { border-color: #3a3a45; color: var(--fg); }
.btn-disabled {
  background: var(--surface);
  color: var(--fg-faint);
  border-color: var(--border);
  cursor: not-allowed;
  pointer-events: none;
}
.soon {
  display: inline-block;
  margin-left: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-3);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 8px;
  vertical-align: middle;
}

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 84px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
  margin-bottom: 22px;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--grad); }
.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.08;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.sub { font-size: 1.18rem; color: var(--fg-dim); margin: 0 0 30px; max-width: 36ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

/* ---------- hero visual (pure CSS/canvas, no Three.js) ---------- */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 80% 10%, rgba(51, 153, 255, 0.16), transparent 60%),
    var(--bg-soft);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.hero-visual canvas { width: 100%; height: 100%; display: block; }
.hero-visual .visual-note {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.03em;
}
/* JS-disabled fallback: a calm animated gradient orb */
.hero-visual .fallback-orb {
  width: 58%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), var(--accent-3), var(--accent-1));
  filter: blur(2px);
  opacity: 0.85;
  animation: spin 14s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .fallback-orb { animation: none; }
}

/* ---------- sections ---------- */
section { padding: 64px 0; border-top: 1px solid var(--border); }
.section-head { max-width: 60ch; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 12px; letter-spacing: -0.01em; }
.section-head p { color: var(--fg-dim); margin: 0; font-size: 1.05rem; }
.kicker {
  font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-2); margin: 0 0 10px;
}

/* what-it-is */
.lead { font-size: 1.15rem; color: var(--fg); max-width: 62ch; }
.lead strong { color: var(--fg); }

/* features grid */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.card:hover { border-color: #353541; transform: translateY(-2px); }
.card .ico {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; margin-bottom: 14px;
  background: rgba(51, 153, 255, 0.12);
  border: 1px solid var(--border);
}
.card .ico svg { width: 22px; height: 22px; stroke: var(--accent-3); }
.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--fg-dim); font-size: 0.96rem; }

/* see-it / showcase */
.showcase {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}
.showcase-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
}
.showcase-frame {
  aspect-ratio: 16 / 10;
  display: grid;
  place-items: center;
  background:
    radial-gradient(80% 80% at 50% 0%, rgba(128, 82, 255, 0.18), transparent 70%),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.015) 0 2px, transparent 2px 20px),
    var(--bg-soft);
  position: relative;
  text-align: center;
  padding: 24px;
}
.showcase-frame .play-badge {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--grad);
  display: grid; place-items: center;
  box-shadow: 0 8px 30px rgba(51,153,255,0.35);
  margin-bottom: 16px;
}
.showcase-frame .play-badge svg { width: 26px; height: 26px; fill: #fff; margin-left: 3px; }
.showcase-frame .label { color: var(--fg-dim); font-size: 0.95rem; }
.showcase-meta h3 { margin: 0 0 12px; font-size: 1.5rem; }
.showcase-meta p { color: var(--fg-dim); margin: 0 0 22px; }

/* get started */
.start-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.code-block {
  background: #08080a;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--fg-dim);
  overflow-x: auto;
}
.code-block .c { color: var(--fg-faint); }
.code-block .ok { color: var(--accent-3); }
.start-note { color: var(--fg-dim); font-size: 0.96rem; }
.start-note ul { padding-left: 18px; margin: 12px 0 0; }
.start-note li { margin-bottom: 8px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--fg-faint);
  font-size: 0.9rem;
}
.footer-row { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a { color: var(--fg-dim); }
.footer-links .muted { color: var(--fg-faint); cursor: not-allowed; }
.footer-links .muted:hover { text-decoration: none; }
.footer-brand { display: flex; align-items: center; gap: 9px; color: var(--fg-dim); }
.footer-brand img { width: 22px; height: 22px; }
.version-pill {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-visual { max-width: 420px; }
  .features { grid-template-columns: 1fr; }
  .showcase { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: 1fr; }
  .nav-links a:not(.btn) { display: none; }
}