:root{--bg: #f5f7fa;--text: #1f2933;--muted: #52606d;--floor: #cbd2d9;--accent: #2c5282;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}@media(prefers-color-scheme:dark){:root{--bg: #12171f;--text: #e4e7eb;--muted: #9aa5b1;--floor: #3e4c59;--accent: #90cdf4}}body{margin:0;min-height:100vh;display:grid;place-items:center;background:var(--bg)}.placeholder{width:100%;max-width:560px;padding:2rem 16px;box-sizing:border-box;text-align:center}.brand{margin:0 0 .5rem;font-weight:700;letter-spacing:.12em;color:var(--accent)}.placeholder h1{margin:0 0 1.5rem;font-size:clamp(1.6rem,5vw,2.4rem);line-height:1.2;text-wrap:balance}.scene{display:block;width:100%;height:auto}.floor{stroke:var(--floor);stroke-width:2;stroke-linecap:round}