:root{color-scheme:light;--paper:#f7f7ef;--ink:#182d34;--muted:#465c60;--line:#c9d1c6;--accent:#e2ed8a;--board:#123c35;--fruit:#ffb17b;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-size:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);line-height:1.75}a{color:inherit;text-underline-offset:.25em}a:hover{color:#35604a}button,a{-webkit-tap-highlight-color:transparent}::selection{background:var(--accent);color:var(--ink)}:focus-visible{outline:3px solid #a34d22;outline-offset:4px}button{font:inherit;line-height:1.3;cursor:pointer;border:1px solid var(--ink);border-radius:6px;background:transparent;color:var(--ink);padding:12px 20px;min-height:46px}button:hover:not(:disabled){background:#e7eadd}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--ink);color:var(--paper)}button.primary:hover{background:#305647}.skip{position:absolute;top:-80px;left:16px;background:var(--accent);padding:10px;z-index:2}.skip:focus{top:10px}.site-header,main,.site-footer{max-width:1184px;margin:auto;padding-left:32px;padding-right:32px}.site-header{min-height:94px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}.brand{font-size:22px;font-weight:750;letter-spacing:-.025em;text-decoration:none}.brand span{font-size:12px;font-weight:500;letter-spacing:0;margin-left:12px;padding-left:12px;border-left:1px solid var(--line)}nav{display:flex;gap:26px;font-size:14px}nav a{text-decoration:none}.intro{padding:54px 0 36px;display:flex;align-items:flex-end;justify-content:space-between;gap:24px}h1{font-size:clamp(32px,4vw,52px);font-weight:650;letter-spacing:-.03em;line-height:1.22;margin:0}.intro p{font-size:15px;color:var(--muted);margin:0}h2{font-size:24px;letter-spacing:-.02em;line-height:1.4;margin:0 0 16px}.play-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:64px;align-items:start;padding-bottom:56px}.game-panel{min-width:0}.game-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:14px}.game-top h2{font-size:18px;margin:0}.scores{display:flex;gap:20px;font-size:13px;color:var(--muted)}.scores strong{font-variant-numeric:tabular-nums;font-size:20px;color:var(--ink);margin-left:6px}canvas{display:block;width:100%;aspect-ratio:1;background:var(--board);border-radius:12px;touch-action:none}.game-status{min-height:28px;margin:12px 0;font-size:14px;color:var(--muted)}.game-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.key-tip{font-size:12px;color:var(--muted);margin-left:auto}.play-notes{padding-top:48px}.play-notes>p{color:var(--muted);max-width:36ch}dl{margin:28px 0 32px}dt{font-size:17px;font-weight:650;margin-top:20px}dd{margin:5px 0 0;color:var(--muted);font-size:15px;max-width:36ch}.text-link{font-weight:600;font-size:15px}.text-link span{margin-left:6px}.small-note{font-size:12px;line-height:1.8;margin-top:28px}.direction-pad{display:none;grid-template-columns:50px 50px 50px;grid-template-rows:44px 44px;gap:6px;justify-content:center;margin-top:18px}.direction-pad button{padding:6px;min-height:44px;touch-action:manipulation}.up{grid-column:2}.left{grid-column:1;grid-row:2}.down{grid-column:2;grid-row:2}.right{grid-column:3;grid-row:2}.reading{border-top:1px solid var(--line);padding:38px 0 48px;display:grid;grid-template-columns:1fr 1fr;gap:64px}.reading p{color:var(--muted);max-width:38ch;font-size:15px}.reading h2{font-size:25px}.code-note{background:var(--accent);padding:26px}.code-note code{font-size:17px}.code-note p{font-size:14px;margin:12px 0}.code-note a{font-size:14px}.site-footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;padding-top:22px;padding-bottom:30px;color:var(--muted);font-size:12px}.article{max-width:820px;margin:48px auto 64px}.article h1{font-size:38px;margin-bottom:20px}.article h2{margin-top:38px}.article p,.article li{max-width:70ch}.article .lead{color:var(--muted);font-size:18px}.article pre{background:#e8ecdf;padding:20px;overflow-x:auto;border-radius:6px;font-size:14px;line-height:1.7}.article code{font-family:ui-monospace,monospace}.article .download{display:inline-block;margin-top:8px;padding:12px 20px;background:var(--ink);color:var(--paper);text-decoration:none;border-radius:6px}.article li{margin-bottom:10px}.article .notice{color:var(--muted);font-size:14px}
@media(pointer:coarse){.direction-pad{display:grid}.key-tip{display:none}}
@media(max-width:760px){.site-header,main,.site-footer{padding-left:20px;padding-right:20px}.site-header{min-height:76px}.brand{font-size:19px}.brand span{display:none}nav{gap:16px;font-size:13px}.intro{display:block;padding:32px 0 28px}.intro p{margin-top:16px;font-size:14px}.play-layout{grid-template-columns:1fr;gap:28px;padding-bottom:36px}.play-notes{padding-top:8px}.play-notes>p,dd{max-width:none}.play-notes h2{font-size:25px}.play-notes dl{display:grid;grid-template-columns:44px 1fr;column-gap:16px;row-gap:15px;margin:24px 0}.play-notes dt,.play-notes dd{margin:0}.direction-pad{display:grid}.key-tip{display:none}.reading{grid-template-columns:1fr;gap:20px;padding:30px 0}.site-footer{display:block}.site-footer a{display:block;margin-top:8px}.article{margin:32px 0 40px}.article h1{font-size:30px}.article .lead{font-size:16px}.scores{gap:12px}.game-status{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}