:root{--bg:#fbfbfa;--fg:#1c1e21;--muted:#5b616b;--line:#d9dbe0;--accent:#1f6feb;--bad:#c62828;--gap:#8a8f98;--stuck:#d97706;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#14161a;--fg:#e6e8eb;--muted:#9aa1ab;--line:#2c3038;--accent:#6aa5ff;--bad:#ff6b6b;--gap:#9aa1ab;--stuck:#f0a030;--card:#1b1e23}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}
header,footer{padding:16px}
h1{margin:0;font-size:1.4rem}
h2{margin:0 0 .25rem;font-size:1.1rem}
.muted{color:var(--muted);font-size:.9rem}
.visually-hidden{position:absolute;left:-9999px}
main{display:grid;grid-template-columns:minmax(220px,300px) 1fr;gap:16px;padding:0 16px}
nav{max-height:70vh;overflow:auto;border:1px solid var(--line);border-radius:8px;background:var(--card);padding:8px}
#filter{width:100%;padding:8px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--fg)}
details{margin:4px 0}summary{cursor:pointer;font-weight:600}
.ch{display:block;width:100%;text-align:left;border:0;background:none;color:inherit;padding:4px 8px;border-radius:6px;cursor:pointer;font:inherit}
.ch:hover,.ch[aria-current=true]{background:color-mix(in srgb,var(--accent) 18%,transparent)}
.unit{color:var(--muted);font-size:.85rem}
canvas{width:100%;height:auto;border:1px solid var(--line);border-radius:8px;background:var(--card)}
a{color:var(--accent)}
@media (max-width:760px){main{grid-template-columns:1fr}nav{max-height:40vh}}