:root{color-scheme:dark;--font-caption:.8125rem;--font-badge:clamp(.6875rem, 2.8vw, .75rem);--font-label:clamp(.6875rem, 2.8vw, .8125rem);--font-text:clamp(.875rem, 3vw, 1.125rem);--font-section:clamp(1.125rem, 4.5vw, 1.25rem);--font-stat:clamp(1.25rem, 5vw, 1.625rem);--font-score:clamp(1.25rem, 5.5vw, 1.75rem);--font-heading:clamp(1.5rem, 6vw, 1.75rem);--font-title:clamp(1.5rem, 5vw, 2.5rem);--font-logo:clamp(1.625rem, 7vw, 2.25rem);--radius-sm:6px;--radius-md:8px;--radius-lg:10px;--radius-xl:15px;--radius-round:50%;--radius-pill:999px;--shadow-xs:0 2px 6px;--shadow-sm:0 4px 12px;--shadow-md:0 6px 20px;--shadow-lg:0 8px 32px;--shadow-xl:0 10px 40px;--shadow-glow:0 0 20px;--duration-fast:.2s;--duration-base:.3s;--theme-reveal-duration:.5s;--score-pop-duration:.6s;--record-badge-duration:4s;--focus-ring-width:3px;--focus-ring-offset:3px;--page-bg:#333;--text:#f0f0f0;--text-muted:#c4c4c4;--focus-ring-color:#fff;--surface:#444;--surface-border:#555;--divider:#666;--surface-hover:#555;--icon-muted:#b0b0b0;--icon-hover:#fff;--icon-hover-bg:#ffffff1f;--accent:gold;--on-gold:#3b3226;--logo-bg:linear-gradient(135deg, #f5d36b 0%, #edc22e 100%);--logo-shadow:#edc22e59;--record-badge-bg:gold;--record-badge-shadow:#00000059;--board-bg:#32323266;--board-shadow:#0000004d;--grid-bg:#0000001a;--cell-bg:#ffffff1a;--backdrop:#00000080;--dialog-text:#fff;--dialog-shadow:#00000080;--game-over-bg:#503232;--win-bg:linear-gradient(135deg, #576dd7 0%, #764ba2 100%);--win-shadow:#576dd780;--summary-bg:#0003;--summary-label:#e0e0e0;--button-bg:#fff;--button-text:#000;--button-hover-bg:#f0f0f0;--button-shadow:#0003;--button-hover-shadow:#0000004d;--button-outline:#fffc;--button-outline-hover-bg:#ffffff26}:root[data-theme=light]{color-scheme:light;--page-bg:#f4efe6;--text:#2e2620;--text-muted:#6b6055;--focus-ring-color:#2e2620;--surface:#fffdf8;--surface-border:#ddd3c2;--divider:#b9ab98;--surface-hover:#f0e9db;--icon-muted:#7a6f63;--icon-hover:#2e2620;--icon-hover-bg:#2e262014;--accent:#9a6b00;--logo-shadow:#9a6b004d;--record-badge-shadow:#4632144d;--board-bg:#ffffff8c;--board-shadow:#46321429;--grid-bg:#b9ab98;--cell-bg:#ffffff4d;--backdrop:#2e262073;--dialog-shadow:#2e262059}:root[data-theme=light] .confirm-dialog,:root[data-theme=light] .settings-dialog{--dialog-text:#2e2620;--button-bg:#2e2620;--button-text:#fffdf8;--button-hover-bg:#4a3f36;--button-outline:#2e2620d9;--button-outline-hover-bg:#2e262014;--summary-bg:#2e262012;--summary-label:#6b6055}::view-transition-old(root){mix-blend-mode:normal;animation:none}::view-transition-new(root){mix-blend-mode:normal;animation:none}::view-transition-new(root){animation:theme-reveal var(--theme-reveal-duration) ease-in-out}@font-face{font-family:Rubik;font-style:normal;font-weight:300 900;font-display:swap;src:url(/assets/rubik-2e37ea48.woff2)format("woff2")}*{box-sizing:border-box;margin:0;padding:0}html,body{overscroll-behavior-y:none;touch-action:pinch-zoom;-webkit-user-select:none;user-select:none}body{--page-padding:20px;min-height:100dvh;padding:max(var(--page-padding), env(safe-area-inset-top,0px)) max(var(--page-padding), env(safe-area-inset-right,0px)) max(var(--page-padding), env(safe-area-inset-bottom,0px)) max(var(--page-padding), env(safe-area-inset-left,0px));background-color:var(--page-bg);color:var(--text);font-variant-numeric:tabular-nums;flex-direction:column;align-items:center;font-family:Rubik,Arial,sans-serif;line-height:1.15;display:flex;overflow-x:hidden}@media (max-width:768px),(max-height:600px){body{--page-padding:10px}}button{font:inherit}:is(button,a):focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.label{font-size:var(--font-label);letter-spacing:.06em;text-transform:uppercase;font-weight:700}.visually-hidden{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;position:absolute;overflow:hidden}.game-layout{--header-gap:clamp(10px, 2.5vw, 16px);--rows-height:calc(2 * var(--page-padding) + 3 * var(--header-gap) + 199px);--side-width:0px;gap:var(--header-gap);flex-direction:column;flex-grow:1;display:flex}.game-layout .game-header,.game-layout .site-footer{width:min-content;min-width:100%;margin-top:auto}@media (max-height:600px){.game-layout{--header-gap:10px}}@media (max-height:570px) and (min-width:540px) and (orientation:landscape){.game-layout{--rows-height:calc(2 * var(--page-padding) + 50px);--side-width:clamp(276px + var(--header-gap), 100vw - 2 * var(--page-padding) - (100svh - var(--rows-height)), 360px);grid-template-columns:calc(var(--side-width) - var(--header-gap)) auto;grid-template-rows:auto auto;place-content:center;display:grid}.game-layout .game-header,.game-layout .site-footer{margin-top:0}.game-layout .game-header{grid-area:1/1;align-self:start}.game-layout .game-container{grid-area:1/2/3;align-self:center}.game-layout .site-footer{grid-area:2/1;align-self:end}}.site-footer{border-top:1px solid var(--divider);color:var(--text-muted);font-size:var(--font-caption);text-align:center;padding-top:12px}.game-header{align-items:center;gap:var(--header-gap);grid-template-columns:1fr auto;display:grid}.logo{border-radius:var(--radius-md);background:var(--logo-bg);box-shadow:var(--shadow-sm) var(--logo-shadow);color:var(--on-gold);font-size:var(--font-logo);letter-spacing:-.02em;justify-self:start;padding:4px 12px;line-height:1.1}.score-container{gap:var(--header-gap);grid-column:1/-1;grid-template-columns:repeat(2,minmax(0,1fr));margin-top:6px;display:grid}.reset-high-score-button{grid-area:1/2/span 2;align-self:center;margin-left:-4px}.score-box{background-color:var(--surface);border:1px solid var(--surface-border);border-radius:var(--radius-md);grid-template-columns:1fr auto;align-items:center;column-gap:4px;padding:8px 12px;display:grid;position:relative}.score-pops{pointer-events:none;grid-area:1/2;place-self:end;width:0;height:0;position:relative}.score-pops .score-pop{color:var(--accent);font-size:var(--font-text);white-space:nowrap;animation:score-pop var(--score-pop-duration) ease-out forwards;font-weight:700;line-height:1;position:absolute;bottom:2px;right:0}.record-badge{border-radius:var(--radius-pill);background-color:var(--record-badge-bg);box-shadow:var(--shadow-xs) var(--record-badge-shadow);color:var(--on-gold);font-size:var(--font-badge);white-space:nowrap;pointer-events:none;animation:record-badge var(--record-badge-duration) ease-out forwards;padding:2px 8px;font-weight:700;position:absolute;top:0;right:8px;translate:0 -50%}.score-label{color:var(--text-muted);grid-area:1/1/auto/-1}.current-score,.high-score{color:var(--accent);font-size:var(--font-score);font-weight:700;line-height:1.2}.game-container{--cell-gap:clamp(8px, 2vw, 12px);background-color:var(--board-bg);padding:var(--cell-gap);border-radius:clamp(var(--radius-md), 2vw, var(--radius-xl));box-shadow:var(--shadow-lg) var(--board-shadow)}.game-grid{--board-size:4;--cell-size:min(max(40px, (100svh - var(--rows-height) - (var(--board-size) + 3) * var(--cell-gap)) / var(--board-size)), clamp(60px, 72vw / var(--board-size), min(128px, 510px / var(--board-size))), ( 100vw - 2 * var(--page-padding) - var(--side-width) - (var(--board-size) + 3) * var(--cell-gap) ) / var(--board-size));grid-template-columns:repeat(var(--board-size), var(--cell-size));grid-template-rows:repeat(var(--board-size), var(--cell-size));gap:var(--cell-gap);background-color:var(--grid-bg);padding:var(--cell-gap);border-radius:var(--radius-md);display:grid;position:relative}.game-grid:focus-visible{outline:none}.grid-cell{background-color:var(--cell-bg);border-radius:var(--radius-sm)}.tile{top:var(--cell-gap);left:var(--cell-gap);width:var(--cell-size);height:var(--cell-size);border-radius:var(--radius-sm);box-shadow:var(--shadow-sm) var(--tile-shadow);translate:calc(var(--col) * (var(--cell-size) + var(--cell-gap))) calc(var(--row) * (var(--cell-size) + var(--cell-gap)));justify-content:center;align-items:center;font-weight:700;display:flex;position:absolute}.is-sliding .tile{transition:translate var(--tile-slide-duration) ease-out}.merged-tile{visibility:hidden;animation:merge-pop var(--tile-pop-duration) ease-out var(--tile-slide-duration) forwards}.retired-tile{animation:tile-retire 0s var(--tile-slide-duration) forwards}.new-tile{animation:pop-in var(--tile-pop-duration) ease-out backwards}.new-tile.after-slide{animation-delay:var(--tile-slide-duration)}.new-tile.after-merge{animation-delay:calc(var(--tile-slide-duration) + var(--tile-pop-duration))}:root{--tile-sheen:linear-gradient(135deg, #ffffff24, #fff0);--tile-text-dark:#2e2620;--tile-text-light:#f9f6f2;--tile-2048-glow:#ffc43c99;--tile-shadow:#0003;--tile-2:#f1ebdb;--tile-4:#ecdeb1;--tile-8:#eec96c;--tile-16:#f2ab35;--tile-32:#f48815;--tile-64:#f0621d;--tile-128:#c41d16;--tile-256:#ba033d;--tile-512:#ac0157;--tile-1024:#9c026a;--tile-2048:#8a027c;--tile-4096:#c0a1e4;--tile-8192:#9b7be9;--tile-16384:#564ac2;--tile-fallback:#3049a4}:root[data-theme=light]{--tile-2048-glow:#d6960a8c;--tile-shadow:#3c280a47}.tile[data-value]{background-color:var(--tile-fallback);background-image:var(--tile-sheen);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .2)}.tile[data-value="2"]{background-color:var(--tile-2);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="4"]{background-color:var(--tile-4);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="8"]{background-color:var(--tile-8);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="16"]{background-color:var(--tile-16);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="32"]{background-color:var(--tile-32);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="64"]{background-color:var(--tile-64);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .4)}.tile[data-value="128"]{background-color:var(--tile-128);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .35)}.tile[data-value="256"]{background-color:var(--tile-256);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .35)}.tile[data-value="512"]{background-color:var(--tile-512);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .35)}.tile[data-value="1024"]{background-color:var(--tile-1024);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .3)}.tile[data-value="2048"]{background-color:var(--tile-2048);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .3);box-shadow:var(--shadow-glow) var(--tile-2048-glow)}.tile[data-value="4096"]{background-color:var(--tile-4096);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .3)}.tile[data-value="8192"]{background-color:var(--tile-8192);color:var(--tile-text-dark);font-size:calc(var(--cell-size) * .3)}.tile[data-value="16384"]{background-color:var(--tile-16384);color:var(--tile-text-light);font-size:calc(var(--cell-size) * .25)}dialog{border-radius:var(--radius-xl);box-shadow:var(--shadow-xl) var(--dialog-shadow);color:var(--dialog-text);--focus-ring-color:var(--dialog-text);text-align:center;-webkit-user-select:text;user-select:text;border:none;max-width:90vw;margin:auto;padding:40px 30px}dialog[open]{animation:modal-pop var(--duration-base) ease-out;flex-direction:column;align-items:center;display:flex}dialog::backdrop{background-color:var(--backdrop);animation:backdrop-fade var(--duration-base) ease-out}dialog h2{font-size:var(--font-title);margin-bottom:15px}dialog p{font-size:var(--font-text);margin-bottom:25px}@media (max-width:768px){dialog{padding:30px 20px}}.game-over{background-color:var(--game-over-bg)}.game-over .game-over-win-note{margin-bottom:10px}.win-overlay{--dialog-shadow:var(--win-shadow);background:var(--win-bg)}.confirm-dialog,.settings-dialog{background-color:var(--surface)}:is(.confirm-dialog,.settings-dialog) h2{font-size:var(--font-heading)}.settings-dialog{width:360px}.settings-dialog .settings-note{width:100%;font-size:var(--font-caption);text-align:left;margin-bottom:20px}.settings-dialog .settings-section{text-align:left;width:100%;margin-bottom:20px}.settings-dialog .settings-section h3{font-size:var(--font-section);margin-bottom:8px}.settings-dialog .section-heading{justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;display:flex}.settings-dialog .section-heading h3{margin-bottom:0}.settings-dialog .section-heading .icon-button{margin-right:-4px}.settings-dialog .section-note{color:var(--text-muted);font-size:var(--font-caption);margin:2px 0 0}:is(.game-summary,.statistics) dt{color:var(--summary-label)}:is(.game-summary,.statistics) dd{font-size:var(--font-stat);font-weight:700}.game-summary{background-color:var(--summary-bg);border-radius:var(--radius-lg);flex-wrap:wrap;justify-content:center;gap:10px 24px;margin-bottom:25px;padding:10px 18px;display:flex}.statistics{grid-template-columns:1fr 1fr;gap:8px;display:grid}.statistics>div{background-color:var(--summary-bg);border-radius:var(--radius-lg);padding:10px 12px}.dialog-actions{flex-wrap:wrap;justify-content:center;gap:0 12px;display:flex}.button{border-radius:var(--radius-md);background-color:var(--button-bg);min-height:44px;box-shadow:var(--shadow-sm) var(--button-shadow);color:var(--button-text);font-size:var(--font-text);cursor:pointer;transition:background-color var(--duration-base) ease, box-shadow var(--duration-base) ease, transform var(--duration-base) ease;border:2px solid #0000;margin-top:10px;padding:10px 22px;font-weight:700}@media (hover:hover){.button:hover{background-color:var(--button-hover-bg);box-shadow:var(--shadow-md) var(--button-hover-shadow);transform:translateY(-2px)}}.button:active{transform:translateY(0)}.button-outline{border-color:var(--button-outline);color:var(--dialog-text);background-color:#0000}@media (hover:hover){.button-outline:hover{background-color:var(--button-outline-hover-bg)}}.segmented{display:flex}.segmented .segment{cursor:pointer;-webkit-user-select:none;user-select:none;flex:1;position:relative}.segmented .segment span{min-height:44px;color:var(--dialog-text);border:2px solid var(--button-outline);font-size:var(--font-text);transition:background-color var(--duration-fast) ease;background-color:#0000;justify-content:center;align-items:center;margin-left:-2px;font-weight:700;display:flex}.segmented .segment:first-child span{border-radius:var(--radius-md) 0 0 var(--radius-md);margin-left:0}.segmented .segment:last-child span{border-radius:0 var(--radius-md) var(--radius-md) 0}@media (hover:hover){.segmented .segment:hover span{background-color:var(--button-outline-hover-bg)}}.segmented .segment input:checked+span{background-color:var(--button-bg);color:var(--button-text);border-color:var(--button-bg)}.segmented .segment input:focus-visible+span{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.icon-button,.github-link{color:var(--icon-muted);transition:color var(--duration-fast) ease, background-color var(--duration-fast) ease}@media (hover:hover){:is(.icon-button,.github-link):hover{background-color:var(--icon-hover-bg);color:var(--icon-hover)}}.icon-button{border-radius:var(--radius-round);cursor:pointer;background-color:#0000;border:none;padding:3px;position:relative}.icon-button svg{display:block}.icon-button:after{content:"";position:absolute;inset:-7px}.github-link{border-radius:var(--radius-md);order:-1;align-self:flex-end;margin-bottom:6px;padding:10px;display:flex}.toolbar{gap:8px;display:flex}.toolbar-button{background-color:var(--surface);color:var(--text);border:1px solid var(--surface-border);border-radius:var(--radius-md);cursor:pointer;transition:background-color var(--duration-fast) ease;padding:9px}@media (hover:hover){.toolbar-button:hover{background-color:var(--surface-hover)}}.toolbar-button:active{background-color:var(--surface-hover)}.toolbar-button svg{display:block}.theme-toggle .theme-icon-moon,:root[data-theme=light] .theme-toggle .theme-icon-sun{display:none}:root[data-theme=light] .theme-toggle .theme-icon-moon{display:block}@keyframes modal-pop{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}@keyframes backdrop-fade{0%{opacity:0}to{opacity:1}}@keyframes theme-reveal{0%{clip-path:circle(0 at var(--theme-reveal-x) var(--theme-reveal-y))}to{clip-path:circle(var(--theme-reveal-radius) at var(--theme-reveal-x) var(--theme-reveal-y))}}@keyframes pop-in{0%{opacity:0;scale:.5}to{opacity:1;scale:1}}@keyframes merge-pop{0%,to{visibility:visible;scale:1}50%{visibility:visible;scale:1.1}}@keyframes tile-retire{to{visibility:hidden}}@keyframes score-pop{0%{opacity:1;transform:translateY(0)}60%{opacity:1}to{opacity:0;transform:translateY(var(--score-pop-rise,-6px))}}@keyframes record-badge{0%{opacity:0;scale:.6}8%{opacity:1;scale:1.08}14%{scale:1}90%{opacity:1;scale:1}to{opacity:0;scale:1}}@keyframes record-badge-static{0%,to{opacity:1}}@media (prefers-reduced-motion:reduce){*,::backdrop{transition-duration:.01ms!important;animation-duration:.01ms!important}.game-grid{--tile-slide-duration:0s!important;--tile-pop-duration:0s!important}.score-pop{--score-pop-rise:0px;animation-duration:var(--score-pop-duration)!important}.record-badge{animation-name:record-badge-static;animation-duration:var(--record-badge-duration)!important}}