*{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}}

/* Readable constraint board: region boundaries, selected peers and authored variant marks */
body{background:linear-gradient(#e3eae4,#d1d9d4);color:#243b44}.panel{background:#f8f6ea;border:2px solid #8da0a2}h1{font-family:Georgia,serif}.eyebrow{color:#4c6b58}#board{gap:0;border:2px solid #526e76;border-radius:4px;overflow:hidden}#board button{position:relative;border-style:solid;border-color:#8c9da2;border-radius:0;font-size:24px;font-weight:600;color:#233f4d;background-color:#eef1e8}#board button[data-region="1"],#board button[data-region="4"]{background-color:#e7ede3}#board button[data-region="2"],#board button[data-region="5"]{background-color:#e7e9ef}#board button[data-given="true"]{color:#647078;font-weight:800}#board button[data-peer="true"]{box-shadow:inset 0 0 0 3px #bbd0c866}#board button[data-selected="true"]{outline:3px solid #4c6b58;outline-offset:-5px;background-color:#dce6d3}#board button[data-notes="true"]{font:14px/1.5 ui-monospace,monospace;white-space:pre-line;color:#637576}#board button[data-bond]::before,#board button[data-cage]::before{position:absolute;top:1px;left:3px;font:9px/1.1 system-ui;content:attr(data-bond);color:#76598e}#board button[data-cage]::before{content:attr(data-cage);color:#85621e}#controls button{background:#4c6b58;border-color:#92a3a4;font-weight:600}#controls button[data-action^="digit:"]{flex:1 1 44px}#info{font-size:13px}a{color:#3b6374}