:root {
  --bg: #0b0e14;
  --panel: #141a26;
  --border: #2a3550;
  --text: #e8ecf4;
  --muted: #8fa3c8;
  --accent: #66aacc;
  --sponsor: #db61a2;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}
.wrap { max-width: 980px; margin: 0 auto; padding: 24px; }
header.hero { text-align: center; padding: 56px 16px 40px; }
header.hero h1 { font-size: 2.8rem; letter-spacing: -1px; }
header.hero h1 span { color: var(--accent); }
header.hero p.tag { color: var(--muted); font-size: 1.15rem; margin-top: 8px; }
.buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
a.btn {
  display: inline-block; padding: 12px 22px; border-radius: 8px;
  text-decoration: none; font-weight: 600; border: 1px solid var(--border);
  background: var(--panel); color: var(--text); transition: transform .1s ease;
}
a.btn:hover { transform: translateY(-2px); }
a.btn.primary { background: var(--accent); border-color: var(--accent); color: #08111a; }
a.btn.sponsor { background: var(--sponsor); border-color: var(--sponsor); color: #fff; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin: 40px 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.card h3 { margin-bottom: 8px; color: var(--accent); }
.card p { color: var(--muted); font-size: .95rem; }
footer { text-align: center; color: var(--muted); padding: 32px 16px; font-size: .9rem; }
footer a { color: var(--accent); }
.demo-page main { max-width: 1100px; margin: 0 auto; padding: 16px; }
.canvas-holder {
  position: relative; width: 100%; aspect-ratio: 16 / 10;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden;
}
.canvas-holder canvas { width: 100%; height: 100%; display: block; outline: none; }
#loading {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px; color: var(--muted);
}
.spinner {
  width: 36px; height: 36px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
nav.demo-nav { display: flex; gap: 14px; align-items: center; padding: 14px 16px; max-width: 1100px; margin: 0 auto; }
nav.demo-nav a { color: var(--muted); text-decoration: none; }
nav.demo-nav a:hover { color: var(--text); }
nav.demo-nav .spacer { flex: 1; }
.note { color: var(--muted); font-size: .9rem; margin-top: 12px; }

.howto { max-width: 1100px; margin: 8px auto 40px; padding: 0 16px; }
.howto h2 { margin: 18px 0 6px; font-size: 1.3rem; }
.howto details { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; margin-top: 10px; }
.howto summary { cursor: pointer; padding: 12px 16px; font-weight: 600; color: var(--accent); }
.howto .step { padding: 0 16px 14px; }
.howto p { color: var(--muted); font-size: .92rem; margin: 4px 0 8px; }
.howto pre { background: #0d1420; border: 1px solid var(--border); border-radius: 8px; padding: 12px; overflow-x: auto; font-size: .82rem; line-height: 1.5; color: #dbe4f4; }