:root{color-scheme:dark;--bg:#0e1118;--panel:#171d29;--ink:#f7ecd9;--muted:#aeb7c9;--line:#303a50;--accent:#8be0ff;--hot:#ffbf71;--good:#9af0a3;--bad:#ff7f8a;--deep:#111722}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 10% 0%,#253450 0,#0e1118 38rem);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}.shell{max-width:1220px;margin:0 auto;padding:28px 18px 42px}.hero{display:grid;gap:10px;margin-bottom:20px}.eyebrow,.label{color:var(--accent);text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;font-weight:850}.hero h1{font-size:clamp(2.4rem,8vw,5.8rem);line-height:.9;margin:0}.promise{max-width:820px;color:var(--muted);font-size:1.12rem;line-height:1.55}.board-panel{display:grid;grid-template-columns:1.45fr 1.1fr .8fr;gap:12px;margin:20px 0}.board-panel>div,.board-wrap,.rules,.receipt,footer{background:rgba(23,29,41,.88);border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:0 14px 40px rgba(0,0,0,.24)}.goal-card strong,.solved-card strong{display:block;margin:.35rem 0 .2rem;font-size:1.25rem}.goal-card p,.solved-card p{margin:.2rem 0 0;color:var(--muted);line-height:1.45}.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}button{border:1px solid #496071;border-radius:999px;background:#202a3b;color:var(--ink);padding:9px 13px;font-weight:850;cursor:pointer}button:hover,button.active{background:#30435e;border-color:var(--accent)}button.solved{border-color:rgba(154,240,163,.8);box-shadow:0 0 0 1px rgba(154,240,163,.25) inset}.play{display:grid;grid-template-columns:minmax(320px,1fr) 420px;gap:16px}.grid{display:grid;grid-template-columns:repeat(9,46px);grid-auto-rows:46px;gap:4px;justify-content:center;margin:10px auto 16px}.cell{position:relative;display:grid;place-items:center;border:1px solid #29344a;background:#121824;border-radius:10px;color:#dfe7f5;font-weight:900;min-width:0}.cell.wall{background:#070a10;border-color:#20283a}.cell.source{background:#243348;border-color:#8be0ff}.cell.sink{background:#1d3a2a;border-color:#9af0a3}.cell.belt{background:#242033;border-color:#786ca8}.cell.split{background:#3a2f21;border-color:#ffbf71}.cell.gate{background:#3b2331;border-color:#ff7f8a}.cell.default-trail::before{content:"";position:absolute;inset:12px;border:2px dashed rgba(139,224,255,.28);border-radius:8px}.cell.default-jam{background-image:linear-gradient(135deg,rgba(139,224,255,.16) 0 25%,transparent 25% 50%,rgba(139,224,255,.16) 50% 75%,transparent 75%)}.cell.trail::after{content:"";position:absolute;inset:7px;border:2px solid rgba(139,224,255,.72);border-radius:8px}.cell.jam{box-shadow:0 0 0 3px rgba(255,127,138,.65) inset}.parcel{width:12px;height:12px;border-radius:999px;background:#f8e6a6;box-shadow:0 0 15px rgba(248,230,166,.65);z-index:2}.caption{min-height:2.8rem;color:var(--muted);line-height:1.45}.controls{display:flex;gap:10px;flex-wrap:wrap}.run-detail{margin-top:12px;border-top:1px solid var(--line);padding-top:10px;color:var(--muted)}.run-detail summary{cursor:pointer;color:var(--accent);font-weight:850}.audit-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:10px}.audit-grid div{background:#111722;border:1px solid #2c3548;border-radius:12px;padding:10px}.rules h2{margin-top:0}.rules p{color:var(--muted);line-height:1.45}.rules ol{display:grid;gap:10px;padding-left:1.4rem}.rule{border:1px solid #2e394e;border-radius:14px;background:#111722;padding:10px}.rule.disabled{opacity:.55}.rule-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.rule code{display:block;color:#d6e3f5;margin-top:6px;line-height:1.4}.rule small,.after-fire{color:var(--muted)}.after-fire{font-weight:850}.ops{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}.mini{padding:6px 9px;font-size:.8rem}.receipt{white-space:pre-wrap;margin-top:16px;color:#e6eefc;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.45}footer{margin-top:16px;color:var(--muted)}@media(max-width:900px){.board-panel,.play{grid-template-columns:1fr}.grid{grid-template-columns:repeat(9,1fr);grid-auto-rows:minmax(32px,10vw)}.cell{border-radius:7px}.audit-grid{grid-template-columns:1fr}}