@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=IBM+Plex+Sans:wght@400;500;700&display=swap');
:root{--boxboard:#F4EFE6;--paper-shade:#E6DEC8;--ink:#141311;--mecha-red:#E02B20;--signal-yellow:#F7B500;--cobalt-blue:#1858A8;--font-display:'Archivo Black',Impact,'Arial Black',sans-serif;--font-body:'IBM Plex Sans',system-ui,sans-serif;--border-thick:3px solid var(--ink);--border-heavy:4px solid var(--ink);--shadow-hard:6px 6px 0 var(--ink);--shadow-button:4px 4px 0 var(--ink);--max-width:1180px;--gutter:clamp(16px,4vw,36px);color-scheme:light}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--boxboard);scroll-padding-top:env(safe-area-inset-top,0px)}
body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;background:var(--boxboard);background-image:radial-gradient(var(--paper-shade) 1.25px,transparent 1.25px);background-size:18px 18px;color:var(--ink);font:16px/1.5 var(--font-body);-webkit-font-smoothing:antialiased;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.48}a:focus-visible,button:focus-visible,.board:focus-visible{outline:4px solid var(--cobalt-blue);outline-offset:4px}.hidden{display:none!important}
/* Matching header and shelf as the physical Neon Snake edition */
.masthead{background:var(--boxboard);border-bottom:var(--border-heavy)}.masthead-inner{max-width:var(--max-width);margin:auto;padding:16px var(--gutter);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:20px}.brand-mark{display:inline-flex;border:var(--border-thick);box-shadow:var(--shadow-button);font:1.35rem/1 var(--font-display);letter-spacing:-.02em}.brand-orbit{background:var(--mecha-red);color:var(--boxboard);padding:9px 13px}.brand-arcade{background:var(--signal-yellow);padding:9px 13px;border-left:var(--border-thick)}.carton-badge{display:inline-flex;align-items:center;gap:12px;background:var(--paper-shade);border:var(--border-thick);padding:5px 14px 5px 6px;font-weight:700;font-size:.92rem}.carton-badge img{display:block;width:36px;height:36px;border:2px solid var(--ink);background:#fff;object-fit:contain}
.tab-link,.punch-btn{display:inline-flex;justify-content:center;align-items:center;min-height:44px;padding:8px 18px;background:var(--boxboard);border:var(--border-thick);box-shadow:3px 3px 0 var(--ink);font-weight:700;font-size:.95rem;transition:transform .1s,box-shadow .1s,background-color .1s}.tab-link:hover,.punch-btn:hover{background:var(--signal-yellow);transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}.tab-link:active,.punch-btn:active{transform:translate(3px,3px);box-shadow:none}
.arcade-columns{width:min(var(--max-width),100%);margin:0 auto;padding:32px var(--gutter) 72px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;align-items:start}.page{width:100%;max-width:660px;min-width:0;margin:auto}.top-controls{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px}.player:fullscreen{height:100%;width:100%;display:grid;place-content:center;background:var(--boxboard);padding:24px;overflow:auto}.player:fullscreen .puzzle-case{width:min(650px,90vw)}
/* Yellow die-cast sliding puzzle unit */
.puzzle-case{background:var(--signal-yellow);border:var(--border-heavy);box-shadow:var(--shadow-hard)}.case-topline,.case-bottom{background:var(--ink);color:var(--boxboard);display:flex;justify-content:space-between;gap:12px;align-items:center;padding:10px 18px;font-weight:700;font-size:.72rem;letter-spacing:.08em}.case-topline{border-bottom:var(--border-heavy)}.case-bottom{border-top:var(--border-heavy);font-size:.68rem;color:var(--signal-yellow);flex-wrap:wrap}.case-inner{padding:clamp(14px,3vw,24px)}.puzzle-title{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:0 0 18px}.tiny-label{font-size:.72rem;font-weight:700;letter-spacing:.1em}.puzzle-title h1{font:clamp(2.8rem,7vw,4.2rem)/1 var(--font-display);letter-spacing:-.04em;margin-top:5px}.puzzle-title h1 span{color:var(--mecha-red)}.target-seal{display:flex;flex-direction:column;align-items:center;gap:2px;min-width:108px;background:var(--mecha-red);color:var(--boxboard);border:var(--border-thick);box-shadow:var(--shadow-button);padding:8px 13px;transform:rotate(3deg);font-size:.72rem;font-weight:700}.target-seal b{font:1.45rem/1.1 var(--font-display)}
.score-row{display:grid;grid-template-columns:1fr 1fr .75fr;gap:10px;margin-bottom:16px}.score-window{min-width:0;background:var(--ink);color:var(--boxboard);border:var(--border-thick);padding:9px 12px;box-shadow:inset 0 0 0 2px #2b2927}.score-window span{display:block;color:var(--signal-yellow);font-size:.76rem;font-weight:700}.score-window b{display:block;font:clamp(1.35rem,3.6vw,2rem)/1.15 var(--font-display);letter-spacing:-.04em;margin-top:3px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.board-bezel{background:var(--ink);border:var(--border-heavy);padding:10px}.bezel-header,.bezel-footer{display:flex;justify-content:space-between;align-items:center;gap:8px;color:var(--signal-yellow);font-size:.68rem;font-weight:700;letter-spacing:.07em;padding:3px 4px 12px}.bezel-footer{padding:12px 4px 3px}.board{--gap:10px;--pad:12px;position:relative;aspect-ratio:1;width:100%;background:#393733;touch-action:none;border:3px solid var(--paper-shade);overflow:hidden;outline:none}.cell-layer,.tile-layer{position:absolute;inset:var(--pad);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-template-rows:repeat(4,minmax(0,1fr));gap:var(--gap)}.cell-layer .cell{background:#5b5750;border:2px solid #6a645b;border-radius:3px;box-shadow:inset 2px 2px 0 #302e2a}.tile-layer{pointer-events:none}.tile{display:flex;align-items:center;justify-content:center;min-width:0;min-height:0;position:relative;border:2px solid var(--ink);border-radius:3px;color:var(--ink);background:var(--boxboard);font:clamp(1.45rem,5.7vw,2.65rem)/1 var(--font-display);letter-spacing:-.065em;box-shadow:inset 0 -4px 0 #14131124,2px 2px 0 #14131180;user-select:none;will-change:auto;z-index:1}.tile.is-sliding{transition:transform 175ms cubic-bezier(.2,.8,.2,1);will-change:transform;z-index:3}.tile.born{animation:tile-stamp 220ms cubic-bezier(.22,1.35,.4,1) backwards}.tile.merged{animation:tile-merge 220ms cubic-bezier(.18,.65,.25,1.3);z-index:2}@keyframes tile-stamp{from{opacity:0;scale:.3}to{opacity:1;scale:1}}@keyframes tile-merge{0%{scale:1}50%{scale:1.17}100%{scale:1}}.tile[data-value="2"]{background:#F4EFE6}.tile[data-value="4"]{background:#E6DEC8}.tile[data-value="8"]{background:#F7B500}.tile[data-value="16"]{background:#f58b3e}.tile[data-value="32"]{background:#E02B20;color:white}.tile[data-value="64"]{background:#ae221b;color:white}.tile[data-value="128"]{background:#1858A8;color:white}.tile[data-value="256"]{background:#347bba;color:white}.tile[data-value="512"]{background:#397f74;color:white}.tile[data-value="1024"]{background:#227a50;color:white;font-size:clamp(1.02rem,4.2vw,2rem)}.tile[data-value="2048"]{background:var(--signal-yellow);color:var(--ink);font-size:clamp(1.02rem,4.2vw,2rem);border-color:var(--mecha-red);box-shadow:inset 0 0 0 2px var(--mecha-red)}.tile.super{background:var(--cobalt-blue);color:white;font-size:clamp(.8rem,3.5vw,1.8rem)}
.controls-strip{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:18px}.controls-heading{font-family:var(--font-display);font-size:.95rem}.controls-strip p{font-size:.85rem;font-weight:500}.action-buttons{display:flex;gap:10px}.action{display:inline-flex;justify-content:center;align-items:center;min-height:48px;padding:8px 13px;border:var(--border-thick);box-shadow:var(--shadow-button);background:var(--boxboard);font-weight:700;font-size:.85rem;transition:transform .1s,box-shadow .1s,background-color .1s}.action.primary{background:var(--mecha-red);color:var(--boxboard)}.action:hover:not(:disabled){transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}.action:active:not(:disabled){transform:translate(3px,3px);box-shadow:1px 1px 0 var(--ink)}.action:disabled{box-shadow:none}
.game-overlay{position:absolute;inset:0;z-index:5;background:#141311c7;display:grid;place-items:center;text-align:left;padding:18px}.overlay-content{max-width:350px;width:100%;padding:clamp(16px,4vw,27px);background:var(--boxboard);border:var(--border-heavy);box-shadow:6px 6px 0 var(--mecha-red);transform:rotate(-1deg)}.overlay-icon{display:inline-grid;place-items:center;width:44px;height:44px;background:var(--signal-yellow);border:var(--border-thick);font-size:1.4rem}.overlay-kicker{display:block;font-size:.72rem;letter-spacing:.1em;font-weight:700;margin-top:14px;color:var(--cobalt-blue)}.overlay-content h2{font:clamp(1.5rem,4.2vw,2.2rem)/1.05 var(--font-display);margin:7px 0}.overlay-content p{font-weight:500}.overlay-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.overlay-actions .action{flex:1;box-shadow:3px 3px 0 var(--ink)}
.mobile-pad{display:none;text-align:center;margin:20px auto 0}.mobile-pad button{min-width:60px;min-height:52px;margin:3px;background:var(--boxboard);border:var(--border-thick);box-shadow:3px 3px 0 var(--ink);font:1.5rem var(--font-display);touch-action:manipulation}.mobile-pad button:active{background:var(--mecha-red);color:white;transform:translate(3px,3px);box-shadow:none}@media(pointer:coarse){.mobile-pad{display:block}}
.instruction-card{margin-top:28px;background:var(--paper-shade);border:var(--border-heavy);box-shadow:var(--shadow-hard);padding:24px}.manual-number{font-size:.75rem;font-weight:700;letter-spacing:.12em;color:var(--cobalt-blue)}.instruction-card h2{font:clamp(1.25rem,3vw,1.5rem)/1.2 var(--font-display);margin:10px 0}.instruction-card p{font-weight:500}.instruction-card p+p{margin-top:10px}kbd{display:inline-grid;place-items:center;min-width:23px;padding:1px 4px;border:2px solid var(--ink);background:var(--boxboard);font-size:.85rem;font-weight:700}
.other-games{display:flex;flex-direction:column;gap:16px}.other-games h2{font:1.35rem/1.1 var(--font-display);padding-bottom:10px;border-bottom:var(--border-thick)}.other-game{display:flex;align-items:center;gap:14px;padding:12px;background:var(--boxboard);border:var(--border-thick);box-shadow:var(--shadow-button);transition:transform .1s,box-shadow .1s}.other-game:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--ink)}.other-game:active{transform:translate(3px,3px);box-shadow:1px 1px 0 var(--ink)}.other-game.iron-orbit{border-left:10px solid var(--mecha-red)}.other-game.x-zero{border-left:10px solid var(--cobalt-blue)}.other-game.neon-snake{border-left:10px solid var(--signal-yellow)}.game-thumb{flex:0 0 60px;height:60px;border:2px solid var(--ink);background:#fff;padding:3px;display:grid;place-items:center}.game-thumb img{display:block;width:100%;height:100%;object-fit:contain}.game-link-text{display:flex;flex-direction:column;gap:2px}.game-link-text strong{font:1.1rem/1.1 var(--font-display)}.game-link-text small{font-size:.88rem;font-weight:700}
.sheet-footer{width:min(var(--max-width),100%);margin:auto auto 0;padding:24px var(--gutter) 36px;border-top:var(--border-thick);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-weight:700;font-size:.95rem}.sheet-footer a{text-decoration:underline;text-underline-offset:4px}
@media(max-width:920px){.arcade-columns{grid-template-columns:1fr;gap:40px}.other-games{max-width:660px;width:100%;margin:auto}}@media(max-width:560px){.carton-badge{order:3;width:100%}.case-inner{padding:14px}.board{--gap:7px;--pad:7px}.controls-strip{flex-direction:column;align-items:stretch}.action-buttons{display:grid;grid-template-columns:1fr 1fr}.tile{font-size:clamp(1.4rem,7vw,2.45rem)}.tile[data-value="1024"],.tile[data-value="2048"]{font-size:clamp(1rem,5vw,1.9rem)}}@media(max-width:390px){.arcade-columns{padding:22px 12px 56px}.case-inner{padding:10px}.score-row{gap:5px}.score-window{padding:7px}.score-window span{font-size:.65rem}.score-window b{font-size:1.3rem}.board-bezel{padding:7px}.board{--gap:5px;--pad:6px}.bezel-header,.bezel-footer{font-size:.59rem}.puzzle-title h1{font-size:2.5rem}.target-seal{min-width:84px;padding:7px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-delay:0ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}