:root{font-family:Arial,"Microsoft YaHei",sans-serif;color:#252c29;background:#f5f6f3;font-synthesis:none}*{box-sizing:border-box}body{margin:0}.app{max-width:1220px;min-height:100vh;margin:auto;padding:0 54px;display:flex;flex-direction:column}.topbar{height:92px;border-bottom:1px solid #e2e6e0;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:14px}.brand b,footer b{color:#b9c2b9;margin:0 4px}.brand-mark{width:30px;height:30px;background:#263d35;color:#fff;display:grid;place-items:center;font-size:17px;border-radius:5px}.edition,.eyebrow,.board-heading,.board-footer,footer{font-size:12px;font-weight:700;letter-spacing:.04em}.edition{color:#89948b}.game-layout{flex:1;display:grid;grid-template-columns:1fr minmax(380px,500px);gap:80px;align-items:center;padding:54px 0}.intro{align-self:center}.eyebrow{color:#668d76;display:flex;gap:9px;align-items:center}.eyebrow span,.board-status i{width:7px;height:7px;background:#80aa8b;border-radius:50%;display:inline-block}h1{font-size:100px;line-height:1;margin:20px 0 20px;letter-spacing:0;color:#263c34}h1 span{color:#d4a25f}.subtitle{font-size:16px;line-height:1.9;color:#77837a;margin:0}.subtitle strong{color:#344a3e}.score-row{display:flex;gap:12px;margin-top:36px}.score-box{width:144px;min-height:84px;border:1px solid #dce4dc;border-radius:6px;background:#fff;padding:15px 18px;display:flex;flex-direction:column;gap:8px}.score-box span{font-size:12px;color:#8b978d}.score-box strong{font-size:24px;line-height:1}.score-box.best{background:#eaf0e8;border-color:#eaf0e8}.actions{display:flex;gap:10px;margin-top:18px}button{font:inherit;font-size:13px;font-weight:700;cursor:pointer;border-radius:5px;min-height:45px;padding:0 18px}button span{font-size:20px;vertical-align:-1px;margin-right:5px}.primary{background:#304d3d;color:white;border:1px solid #304d3d}.primary:hover{background:#203c2d}.secondary{background:transparent;color:#53665a;border:1px solid #ced8ce}.secondary:hover{background:#e9eee8}button:disabled{opacity:.4;cursor:not-allowed}.hint{border-top:1px solid #e1e6df;margin-top:44px;padding-top:23px;display:flex;gap:13px;max-width:350px}.hint-icon{width:27px;height:27px;flex:none;border:1px solid #d8e0d8;border-radius:50%;display:grid;place-items:center;color:#76917c}.hint p{font-size:12px;line-height:1.9;color:#939e95;margin:0}.hint strong{color:#53665a}.play-area{width:100%}.board-heading,.board-footer{display:flex;justify-content:space-between;align-items:center;color:#53645a}.board-heading{margin-bottom:15px}.board-status{color:#91a096;font-size:11px;font-weight:400}.board-status i{margin-right:5px}.board-wrap{position:relative}.board{aspect-ratio:1;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:12px;padding:12px;background:#b9c9bc;border-radius:8px;touch-action:none;user-select:none}.cell{display:grid;place-items:center;border-radius:5px;background:#d6e0d5;color:#364d3f;font-weight:800;font-size:38px}.tile-2{background:#f5f7ef}.tile-4{background:#e8eedd}.tile-8{background:#cfe2c7}.tile-16{background:#a9cfad}.tile-32{background:#83b99b;color:#fff}.tile-64{background:#5d9c7d;color:#fff}.tile-128{background:#edcd8c;color:#fff;font-size:32px}.tile-256{background:#e6bc6d;color:#fff;font-size:32px}.tile-512{background:#dca85a;color:#fff;font-size:32px}.tile-1024,.tile-2048,.tile-high{background:#c88945;color:#fff;font-size:27px}.board-footer{margin-top:17px;color:#a2ada3;font-size:10px}.board-footer b{color:#d1a361;font-size:15px}.overlay{position:absolute;inset:0;background:rgba(238,244,235,.91);border-radius:8px;display:grid;place-items:center;text-align:center}.overlay[hidden]{display:none}.overlay-icon{font-size:38px;color:#c99552}.overlay h2{font-size:30px;margin:12px 0;color:#304d3d}.overlay p{font-size:14px;color:#7b897d;margin:0 0 25px}.overlay-actions{display:flex;gap:8px;justify-content:center}footer{border-top:1px solid #e2e6e0;padding:24px 0;color:#a4afa5;display:flex;justify-content:space-between;font-size:10px}@media(max-width:800px){.app{padding:0 24px}.topbar{height:70px}.game-layout{grid-template-columns:1fr;gap:28px;padding:32px 0 40px;max-width:500px;width:100%;margin:auto}.intro{display:grid;grid-template-columns:1fr auto;column-gap:15px}.eyebrow{grid-column:1/-1}h1{font-size:67px;margin:12px 0}.subtitle{font-size:13px}.score-row{grid-column:2;grid-row:2/4;margin:10px 0 0;gap:7px}.score-box{width:85px;min-height:68px;padding:11px}.score-box strong{font-size:20px}.actions{grid-column:1/-1;margin-top:20px}.hint{grid-column:1/-1;margin-top:20px;padding-top:16px}.play-area{grid-row:2}.board{gap:9px;padding:9px}.cell{font-size:32px}.tile-128,.tile-256,.tile-512{font-size:27px}.tile-1024,.tile-2048,.tile-high{font-size:22px}}@media(max-width:390px){.app{padding:0 16px}.score-box{width:72px}.cell{font-size:27px}.tile-1024,.tile-2048,.tile-high{font-size:19px}}