:root{color-scheme:dark;--bg: #0d0d0f;--panel: #18181b;--panel-alt: #121216;--border: #2f2f35;--text: #f3f3f3;--muted: #a1a1aa;--accent: #f0f0f0}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:var(--text);background:radial-gradient(circle at top right,#1f1f28 0%,transparent 50%),radial-gradient(circle at bottom left,#151519 0%,transparent 40%),var(--bg);min-height:100vh}body.obs-readonly{background:transparent!important}.app-shell{display:grid;grid-template-columns:minmax(280px,360px) minmax(0,1fr);gap:1rem;padding:1rem;min-height:100vh}.obs-shell{min-height:100vh;width:100%;display:grid;place-items:center;padding:0;background:transparent}.obs-board-panel{width:min(100vw,100vh);aspect-ratio:1 / 1;display:grid;place-items:center;background:transparent;border:0;padding:.65rem}.obs-board-panel .board{width:100%}.panel,.board-panel{background:linear-gradient(180deg,var(--panel),var(--panel-alt));border:1px solid var(--border);border-radius:12px;padding:1rem}h1{margin-top:0;margin-bottom:.4rem;font-size:1.4rem}.subtle{color:var(--muted);margin-top:0}.form{display:grid;gap:.75rem;margin-top:1rem}label{display:grid;gap:.25rem;color:var(--muted);font-size:.92rem}input,select,button{border-radius:8px;border:1px solid var(--border);background:#0f0f13;color:var(--text);padding:.55rem .7rem}button{cursor:pointer;border-color:#575760}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.55;cursor:not-allowed}.square:disabled{opacity:1}.join-form{padding-top:.5rem;border-top:1px dashed var(--border)}.checkbox-row{display:flex;align-items:center;gap:.55rem}.checkbox-row input{width:16px;height:16px}.color-row{display:grid;grid-template-columns:52px minmax(0,1fr);gap:.55rem}.color-row input[type=color]{padding:0;height:38px;border-radius:8px}.share-box{margin-top:.8rem;padding-top:.8rem;border-top:1px dashed var(--border);display:grid;gap:.5rem}.error{color:#fca5a5}.board-header{display:flex;justify-content:space-between;gap:.75rem;flex-wrap:wrap;color:var(--muted);margin-bottom:.75rem}.board{display:grid;gap:.65rem;width:min(92vw,760px);max-width:100%;aspect-ratio:1 / 1;grid-auto-rows:1fr}.board-wrap{position:relative;width:fit-content;max-width:100%}.winner-overlay{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:6;min-width:440px;max-width:min(92%,960px);padding:1.8rem 2rem;border-radius:20px;border:1px solid #f5f5f5;background:#09090ce6;text-align:center;box-shadow:0 20px 56px #00000073}.winner-overlay-title{font-size:2.4rem;font-weight:700}.winner-overlay-reason{margin-top:.4rem;color:var(--muted);font-size:1.72rem}.square{min-height:0;height:100%;text-align:left;padding:.7rem;display:grid;align-content:start;gap:.25rem;background:#111117;position:relative;overflow:hidden}.square>*{position:relative;z-index:2}.square-sprite{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:92%;height:92%;object-fit:contain;image-rendering:pixelated;z-index:0;pointer-events:none;opacity:1;filter:none}.square .label{font-weight:600;text-shadow:0 1px 2px rgba(0,0,0,.85)}.square .meta{font-size:.78rem;color:var(--muted);text-shadow:0 1px 2px rgba(0,0,0,.85)}.square .sprite-warning{color:#fca5a5}.square.claimed{border-style:solid;border-color:#8c8c97;background:repeating-linear-gradient(135deg,#17171e,#17171e 10px,#131319 10px,#131319 20px)}.square.mine{border-color:#f3f3f3}@media(max-width:880px){.app-shell{grid-template-columns:1fr}.board{width:100%}}