Moonchess: vanishing tic-tac-toe, online and practice modes
Online play over WebSockets with any-string game codes, seats and spectators, and a 1-second heartbeat. Practice mode against Columbina, backed by a full solver, with an accuracy slider, spoilers, undo and piece freshness. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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:root {
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--bg: #f6f5f1;
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--surface: #ffffff;
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--border: #dedbd2;
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--text: #1d1c1a;
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--muted: #6f6c64;
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--x: #d0543a;
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--o: #2f6fb5;
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--win: #e9c46a;
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--error: #b3261e;
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--radius: 14px;
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color-scheme: light;
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}
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@media (prefers-color-scheme: dark) {
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:root {
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--bg: #15161a;
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--surface: #1f2026;
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--border: #33353d;
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--text: #ecebe6;
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--muted: #9a988f;
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--x: #f07a5f;
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--o: #6aa6ea;
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--win: #c9a64a;
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--error: #ff8a80;
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color-scheme: dark;
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}
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}
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* { box-sizing: border-box; }
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body {
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margin: 0;
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min-height: 100vh;
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background: var(--bg);
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color: var(--text);
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font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
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display: flex;
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justify-content: center;
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}
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main {
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width: 100%;
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max-width: 420px;
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padding: 48px 16px;
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}
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h1 { font-size: 2.2rem; margin: 0 0 8px; letter-spacing: -0.02em; }
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.lede { color: var(--muted); margin: 0 0 32px; }
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button {
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font: inherit;
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font-weight: 600;
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padding: 12px 18px;
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border-radius: 10px;
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border: 1px solid var(--border);
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background: var(--surface);
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color: var(--text);
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cursor: pointer;
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}
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button:hover { border-color: var(--muted); }
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button.primary { background: var(--text); color: var(--bg); border-color: var(--text); width: 100%; }
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button.primary:hover { opacity: 0.9; }
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button.small { padding: 6px 12px; font-size: 0.875rem; }
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button.ghost { background: transparent; }
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.divider {
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display: flex; align-items: center; gap: 12px;
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color: var(--muted); font-size: 0.875rem; margin: 28px 0 16px;
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}
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.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
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#join-form { display: flex; gap: 8px; }
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#join-code {
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flex: 1; min-width: 0;
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font: 600 1.25rem/1 ui-monospace, "SF Mono", Menlo, monospace;
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letter-spacing: 0.05em; text-transform: uppercase;
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padding: 12px 14px;
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border-radius: 10px; border: 1px solid var(--border);
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background: var(--surface); color: var(--text);
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}
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#join-code::placeholder { text-transform: none; letter-spacing: 0; font-family: system-ui, sans-serif; font-weight: 400; font-size: 1rem; }
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#join-code:focus { outline: 2px solid var(--o); outline-offset: -1px; }
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.error { color: var(--error); min-height: 1.5em; margin: 12px 0 0; }
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.bar { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
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.code-wrap { display: flex; align-items: center; gap: 10px; min-width: 0; }
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.label { color: var(--muted); font-size: 0.875rem; }
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.code {
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font: 700 1.3rem ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: 0.1em;
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min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
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}
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.code-wrap button, .bar > button { flex-shrink: 0; }
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.players { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 24px 0 8px; }
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.player {
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display: flex; align-items: center; gap: 10px;
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padding: 10px 12px; border-radius: 10px;
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border: 1px solid var(--border); background: var(--surface);
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font-size: 0.9rem; color: var(--muted);
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transition: border-color 0.15s;
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}
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.player.active { border-color: var(--text); color: var(--text); }
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.player.empty { border-style: dashed; }
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.player.gone { border-style: dashed; }
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.player.gone .who { color: var(--error); }
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.player .mark { font-weight: 800; font-size: 1.1rem; }
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.mark.x { color: var(--x); }
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.mark.o { color: var(--o); }
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button.player {
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font: inherit; font-size: 0.9rem; font-weight: 400;
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text-align: left; width: 100%; cursor: pointer;
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}
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button.player[aria-pressed="true"] .who { font-weight: 600; }
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.page-title { font-size: 1.4rem; margin: 0; }
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.hint { color: var(--muted); font-size: 0.85rem; margin: 6px 0 0; }
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.difficulty { margin-top: 24px; }
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.difficulty label { display: flex; justify-content: space-between; font-weight: 600; }
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.difficulty output { font-variant-numeric: tabular-nums; }
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.difficulty input { width: 100%; margin: 10px 0 0; accent-color: var(--text); }
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.spoiler {
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margin-top: 20px; padding: 10px 12px;
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border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
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}
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.spoiler summary { cursor: pointer; font-weight: 600; }
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.spoiler p { margin: 8px 0 0; color: var(--muted); }
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.spoiler strong { color: var(--text); }
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.toggle { display: flex; align-items: center; gap: 8px; margin-top: 12px; cursor: pointer; user-select: none; }
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.toggle input { width: 18px; height: 18px; margin: 0; accent-color: var(--text); cursor: pointer; }
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.status { font-size: 1.15rem; font-weight: 600; text-align: center; margin: 20px 0 16px; min-height: 1.5em; }
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.board {
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/* minmax(0, 1fr) and absolutely positioned marks keep cell sizes independent of content */
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display: grid; gap: 8px;
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grid-template-columns: repeat(3, minmax(0, 1fr));
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grid-template-rows: repeat(3, minmax(0, 1fr));
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aspect-ratio: 1; width: min(100%, 60vh); margin: 0 auto;
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}
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.cell {
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position: relative;
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padding: 0; border-radius: var(--radius);
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border: 1px solid var(--border); background: var(--surface);
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display: grid; place-items: center;
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cursor: default;
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}
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.cell.playable { cursor: pointer; }
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.cell.playable:hover { border-color: var(--muted); }
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.cell.win { background: color-mix(in srgb, var(--win) 30%, var(--surface)); border-color: var(--win); }
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.cell svg { position: absolute; inset: 21%; width: 58%; height: 58%; overflow: visible; }
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.cell svg * { fill: none; stroke-width: 12; stroke-linecap: round; }
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.cell .x-mark * { stroke: var(--x); }
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.cell .o-mark * { stroke: var(--o); }
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/* Freshness view: newest piece solid, older ones fading toward the doomed look */
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.board.freshness .cell[data-age="1"] svg { opacity: 0.65; }
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.board.freshness .cell[data-age="2"] svg { opacity: 0.3; }
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.cell.doomed svg { opacity: 0.3; animation: fade 1.6s ease-in-out infinite; }
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.cell.placed svg { animation: pop 0.18s ease-out; }
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@keyframes fade { 50% { opacity: 0.12; } }
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@keyframes pop { from { transform: scale(0.6); opacity: 0; } }
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@media (prefers-reduced-motion: reduce) {
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.cell.doomed svg, .cell.placed svg { animation: none; }
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}
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#game.offline .board,
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#game.offline .players { opacity: 0.4; pointer-events: none; }
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#game.offline .status { color: var(--error); }
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.footer { margin-top: 20px; }
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.actions { display: flex; gap: 8px; }
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.actions > button { flex: 1; }
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.actions > button.primary { flex: 2; }
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.actions > button:disabled { opacity: 0.45; cursor: default; border-color: var(--border); }
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.meta { color: var(--muted); font-size: 0.875rem; text-align: center; margin: 12px 0 0; min-height: 1.5em; }
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