@import"https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@500;700;800;900&display=swap";:root{font-family:"M PLUS Rounded 1c",system-ui,sans-serif;color:#675f57;background:#f7f3ea;font-synthesis:none;--ink: #675f57;--muted: #aa9e92;--orange: #f28b49;--yellow: #f5c900;--board: #b9ab9e;--cell: #cfc4b8}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 50% -10%,#fffdf6 0,#f7f3ea 48%)}button{font:inherit}.app{width:min(100% - 32px,560px);margin:0 auto;padding:max(28px,env(safe-area-inset-top)) 0 60px}.topbar{display:flex;align-items:stretch;justify-content:space-between;gap:18px}.brand-block{display:flex;flex-direction:column;justify-content:center}h1{margin:0;font-size:clamp(56px,15vw,82px);line-height:.9;letter-spacing:-6px;color:var(--yellow);font-weight:900;text-shadow:0 4px 0 #dfb600}.brand-block p{margin:10px 0 0;color:#887d73;font-weight:800;font-size:13px;letter-spacing:.08em}.score-area{display:flex;gap:8px}.score-box{position:relative;min-width:92px;padding:12px 12px 10px;border-radius:13px;background:var(--board);color:#fff;text-align:center;box-shadow:inset 0 -3px #0000000f}.score-box span{display:block;font-size:12px;font-weight:800;color:#f5eee8;letter-spacing:.08em}.score-box strong{display:block;margin-top:2px;font-size:24px;font-weight:900}.score-box em{position:absolute;inset:42% 0 auto;opacity:0;color:#fff;font-style:normal;font-weight:900;pointer-events:none}.score-box em.pop{animation:score-pop .7s ease-out}@keyframes score-pop{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-36px)}}.controls{margin:24px 0 14px;display:flex;align-items:center;justify-content:space-between;gap:12px}.controls p{margin:0;font-weight:800;font-size:15px}.control-buttons{display:flex;gap:8px}.button{border:0;border-radius:10px;padding:11px 15px;color:#fff;cursor:pointer;font-weight:800;box-shadow:0 3px #6956492e;transition:transform .12s ease,filter .12s ease}.button:hover{filter:brightness(1.04);transform:translateY(-1px)}.button:active{transform:translateY(2px);box-shadow:none}.button:disabled{opacity:.42;cursor:default;transform:none}.button-primary{background:var(--orange)}.button-secondary{background:#92867b}.game-shell{position:relative}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(8px,2.4vw,13px);padding:clamp(10px,2.8vw,14px);width:100%;aspect-ratio:1;border-radius:18px;background:var(--board);touch-action:none;-webkit-user-select:none;user-select:none;box-shadow:0 10px 30px #5c48321f,inset 0 -4px #0000000d}.cell{display:grid;place-items:center;min-width:0;border-radius:12px;background:var(--cell);overflow:hidden}.tile{display:grid;place-items:center;width:100%;height:100%;border-radius:12px;color:#6f665e;background:#eee6dc;font-size:clamp(28px,9vw,52px);line-height:1;font-weight:900;letter-spacing:-.05em;box-shadow:inset 0 -4px #0000000f}.tile-new{animation:tile-in .18s cubic-bezier(.2,.9,.3,1.3)}@keyframes tile-in{0%{opacity:.3;transform:scale(.55)}to{opacity:1;transform:scale(1)}}.tile-4{background:#ebe0ca}.tile-8{color:#fff;background:#f3a15b}.tile-16{color:#fff;background:#f38a4e}.tile-32{color:#fff;background:#ed6b48}.tile-64{color:#fff;background:#e84f35}.tile-128{color:#fff;background:#f3d04b;font-size:clamp(24px,7.5vw,44px)}.tile-256{color:#fff;background:#eec436;font-size:clamp(24px,7.5vw,44px)}.tile-512{color:#fff;background:#e9b921;font-size:clamp(24px,7.5vw,44px)}.tile-1024{color:#fff;background:#e5aa08;font-size:clamp(20px,6.3vw,36px)}.tile-2048{color:#fff;background:#f5c900;font-size:clamp(20px,6.3vw,36px);box-shadow:0 0 24px #f5c900aa,inset 0 -4px #0000000f}.tile-4096,.tile-8192,.tile-super{color:#fff;background:#6157a9;font-size:clamp(20px,6.3vw,36px)}.game-message{position:absolute;inset:0;display:grid;place-items:center;padding:24px;border-radius:18px;background:#f7f3ead6;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:5}.game-message[hidden]{display:none}.message-card{text-align:center;animation:tile-in .25s ease-out}.message-card>p:first-child{margin:0 0 4px;color:var(--orange);font-size:13px;font-weight:900;letter-spacing:.18em}.message-card h2{margin:0;font-size:clamp(30px,9vw,48px);color:var(--ink)}.message-card>p{font-weight:800}.message-actions{display:flex;justify-content:center;gap:10px;margin-top:18px}.howto{display:flex;align-items:center;gap:14px;margin:18px 2px 30px;color:#83786e;font-size:13px;line-height:1.65}.howto p{margin:0}.key-hint{flex:none;padding:8px 10px;border:1px solid #d8cfc5;border-bottom-width:3px;border-radius:9px;background:#fff;color:#8d8176;font-size:12px;font-weight:900;letter-spacing:2px}.ranking{padding:20px;border-radius:18px;background:#ffffff9e;border:1px solid #e7dfd5}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-heading span{color:var(--orange);font-size:10px;font-weight:900;letter-spacing:.12em}.section-heading h2{margin:2px 0 0;font-size:18px}.section-heading .storage-note{color:#9b9086;font-size:10px;letter-spacing:0}.ranking ol{margin:14px 0 0;padding:0;list-style:none}.ranking li{display:grid;grid-template-columns:32px 1fr auto;align-items:center;gap:10px;padding:10px 0;border-top:1px solid #eee7df;font-size:13px;font-weight:700}.ranking li strong{font-size:16px;color:var(--ink)}.rank{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;color:#fff;background:var(--board);font-weight:900}.ranking .empty-record{display:block;color:#9c9187;text-align:center}dialog{width:min(calc(100% - 40px),420px);padding:0;border:0;border-radius:20px;color:var(--ink);background:#fffdf8;box-shadow:0 24px 80px #32281e47}dialog::backdrop{background:#392f277a;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}dialog form{padding:30px;text-align:center}.dialog-icon{display:grid;place-items:center;width:54px;height:54px;margin:0 auto 14px;border-radius:50%;color:#fff;background:var(--orange);font-size:28px;font-weight:900}dialog h2{margin:0;font-size:22px}dialog p{color:#8e8379;font-size:13px;line-height:1.7}.dialog-actions{display:flex;justify-content:center;gap:10px;margin-top:22px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:500px){.app{width:min(100% - 24px,560px);padding-top:max(20px,env(safe-area-inset-top))}.topbar{gap:10px}.score-box{min-width:72px;padding-inline:8px}.score-box strong{font-size:19px}.controls{align-items:flex-end}.controls p{max-width:130px;font-size:12px}.button{padding:10px 11px;font-size:12px}.howto{align-items:flex-start}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}