*{box-sizing:border-box}body{margin:0;background:#101d29;color:#f1f4ec;font:16px/1.5 system-ui,sans-serif}main{max-width:520px;margin:auto;padding:16px}h1{font-size:clamp(24px,7vw,34px);line-height:1.1;margin:14px 0}h2{font-size:20px}p{margin:12px 0}small,.eyebrow{color:#c4d8d3}.panel{background:#1b303e;border:1px solid #537078;border-radius:15px;padding:12px;margin:14px 0}#board{display:grid;grid-template-columns:repeat(var(--cols),minmax(0,1fr));gap:3px;margin:16px 0}button,a{touch-action:manipulation}button{min-width:44px;min-height:44px;border:1px solid #84b9b0;border-radius:8px;background:#294959;color:#fff;font:inherit;padding:6px;overflow-wrap:anywhere}button:hover{background:#3c6571}button:focus-visible,a:focus-visible{outline:3px solid #ffce72;outline-offset:2px}button:disabled{opacity:1;background:#172c38;color:#b4c6c4;border-color:#395463}#board button{aspect-ratio:1;font-size:clamp(12px,3.6vw,18px);padding:2px}#controls{display:flex;flex-wrap:wrap;gap:7px}#controls button{flex:1 1 90px}a{display:inline-flex;align-items:center;min-height:44px;color:#aee7de;padding:6px 0;overflow-wrap:anywhere}#info{white-space:pre-wrap;font-size:14px}#message{border-left:3px solid #efc478;padding-left:10px}details summary{min-height:44px;cursor:pointer}footer{margin-top:24px}@media(max-width:350px){main{padding:10px}.panel{padding:8px}}

/* Round 2: physical roles and stage-specific affordances */
h1{font-family:Georgia,serif}.eyebrow{letter-spacing:.12em}#board button{font-weight:700;font-size:25px}body{background:linear-gradient(#dce6ed,#b6c9d4);color:#2b4252}.panel{background:#eff1e8;border:2px solid #8fa7b4}#board{gap:5px;padding-top:25px}#board button{position:relative;background:#d8e0de;color:#5d7884;border-color:#9aafb4;border-radius:6px;box-shadow:inset -5px -5px #0001}#board button[data-layerhead]::before{content:attr(data-layerhead);position:absolute;top:-22px;left:0;color:#526f7b;font:11px system-ui;letter-spacing:.14em}#board button:nth-child(n+7):nth-child(-n+9){margin-top:26px}#board button[data-piece="0"]{background:#e7ad85;color:#69442e}#board button[data-piece="1"]{background:#a9c9e4;color:#3b5b75}#board button[data-piece="2"]{background:#bfd19a;color:#4b662c}#board button[data-piece="3"]{background:#cfb5dc;color:#664277}#board button[data-preview="valid"]{outline:3px dashed #267d75;background:#b7e0d2}#board button[data-preview="blocked"]{outline:3px dashed #ae5660;background:#e7b8bb}#controls button{background:#536e85;border-color:#9eb3c2}a{color:#3d6178}