:root{--bg:#090c16;--bg2:#10172a;--panel:#131b30;--panel2:#18223a;--text:#f7f8ff;--muted:#8e98b5;--accent:#8067ff;--accent2:#30d6c0;--danger:#ff5d7a;--cell:#1a2339;--gap:clamp(6px,1.5vw,11px);--radius:22px;--shadow:0 22px 60px rgba(0,0,0,.28);color-scheme:dark}
:root[data-theme=light]{--bg:#edf1fa;--bg2:#f7f9ff;--panel:#fff;--panel2:#f3f5fb;--text:#151a2b;--muted:#69728a;--cell:#e5e9f3;--shadow:0 18px 50px rgba(31,42,70,.12);color-scheme:light}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at 15% 0,#25255a 0,#10162a 30%,var(--bg) 68%);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}body{overflow-x:hidden;overscroll-behavior:none}.app{width:min(100%,760px);margin:auto;padding:calc(14px + env(safe-area-inset-top)) max(14px,18px) calc(18px + env(safe-area-inset-bottom));min-height:100svh}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),#b06cff);box-shadow:0 12px 34px #8067ff35;font-size:29px;font-weight:950}.brand h1{margin:0;font-size:clamp(22px,5vw,32px);letter-spacing:-.045em}.brand p{margin:3px 0 0;color:var(--muted);font-size:12px}.icon-btn,.secondary-btn,.primary-btn,.bottom-nav button,.modal button{border:0;color:var(--text);font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.icon-btn{width:44px;height:44px;border-radius:14px;background:#ffffff0c;border:1px solid #ffffff12;font-size:19px}.icon-btn:active,.secondary-btn:active,.primary-btn:active,.bottom-nav button:active,.modal button:active,.mode-card:active{transform:scale(.97)}button:disabled,.disabled{cursor:default;pointer-events:auto}.hud{display:grid;grid-template-columns:1fr 1fr 1fr;gap:9px;margin:18px 0 11px}.score-card{background:linear-gradient(145deg,var(--panel),var(--panel2));border:1px solid #ffffff0b;border-radius:17px;padding:10px 13px;box-shadow:var(--shadow);min-width:0}.score-card span{display:block;color:var(--muted);font-size:9px;letter-spacing:.12em;font-weight:850}.score-card strong{display:block;margin-top:3px;font-size:clamp(17px,4vw,25px);letter-spacing:-.03em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.score-card.compact strong{font-size:14px;margin-top:7px;color:#c7c9ff}.controls{display:flex;gap:9px;margin-bottom:12px}.primary-btn,.secondary-btn{min-height:46px;border-radius:15px;padding:0 17px;font-weight:850}.primary-btn{flex:1;background:linear-gradient(135deg,var(--accent),#a06cff);box-shadow:0 10px 24px #8067ff2d}.secondary-btn{background:#ffffff0a;border:1px solid #ffffff12}.secondary-btn.disabled{opacity:.4}.board-wrap{position:relative}.board{position:relative;width:min(100%,620px);aspect-ratio:1;margin:auto;padding:var(--gap);display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);background:linear-gradient(145deg,var(--panel),var(--bg2));border:1px solid #ffffff12;border-radius:var(--radius);box-shadow:0 28px 80px #00000042;touch-action:none;user-select:none;overflow:hidden}.cell{background:var(--cell);border-radius:calc(var(--radius) - 8px);min-width:0}.tile{position:absolute;z-index:2;display:grid;place-items:center;border-radius:calc(var(--radius) - 8px);font-weight:950;line-height:1;transform:translate(var(--x),var(--y));transition:transform 95ms cubic-bezier(.2,.8,.2,1);will-change:transform;contain:layout paint}.tile.new{animation:pop .18s cubic-bezier(.2,1.5,.3,1)}.tile.merge{animation:merge .22s cubic-bezier(.2,1.5,.3,1)}.board.high-value{box-shadow:0 28px 80px #00000045,0 0 45px #8067ff16}.gesture-hint{position:absolute;z-index:10;left:50%;top:50%;transform:translate(-50%,-50%);padding:11px 16px;border-radius:999px;background:#0b0f1ddd;border:1px solid #ffffff15;backdrop-filter:blur(10px);color:#fff;font-weight:850;font-size:12px;pointer-events:none;opacity:0;transition:opacity .25s}.gesture-hint.visible{opacity:1}.timer{position:absolute;z-index:5;right:14px;top:14px;padding:7px 10px;border-radius:10px;background:#0a0d18cc;border:1px solid #ffffff12;font-variant-numeric:tabular-nums;font-weight:900}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:12px}.bottom-nav button{background:#ffffff07;border:1px solid #ffffff0a;border-radius:15px;padding:9px 4px;color:#b7bed5;font-size:16px}.bottom-nav span{display:block;font-size:9px;margin-top:3px}.overlay{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:max(18px,env(safe-area-inset-top)) 18px max(18px,env(safe-area-inset-bottom));background:#050711b8;backdrop-filter:blur(14px)}.overlay[hidden]{display:none}.modal{width:min(100%,500px);max-height:min(88svh,720px);overflow:auto;background:linear-gradient(160deg,var(--panel2),var(--panel));border:1px solid #ffffff12;border-radius:26px;padding:22px;box-shadow:0 30px 100px #0009;animation:modalIn .22s ease-out}.modal h2{margin:0 0 8px;font-size:28px;letter-spacing:-.04em}.modal p{color:var(--muted);line-height:1.5}.modal-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.modal-actions button{flex:1;min-width:140px;min-height:45px;border-radius:14px;background:#ffffff0b;border:1px solid #ffffff10;padding:0 12px}.modal-actions .accent{background:linear-gradient(135deg,var(--accent),#a06cff);border:0}.list{display:grid;gap:8px;margin-top:15px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px;border-radius:14px;background:#ffffff07}.row small{display:block;color:var(--muted);margin-top:3px}.achievement.done{border:1px solid #8067ff66;background:#8067ff12}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:15px}.stat-grid>div{padding:13px;border-radius:15px;background:#ffffff07}.stat-grid small{display:block;color:var(--muted);font-size:10px}.stat-grid strong{display:block;margin-top:4px;font-size:20px}.toggle{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid #ffffff09}.toggle input{width:20px;height:20px;accent-color:var(--accent)}.toast{position:fixed;z-index:80;left:50%;bottom:calc(90px + env(safe-area-inset-bottom));transform:translate(-50%,15px);background:#10162aeF;border:1px solid #ffffff15;border-radius:999px;padding:10px 15px;font-weight:850;font-size:12px;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}.floating-score{position:absolute;z-index:20;left:50%;top:45%;transform:translate(-50%,10px);font-weight:950;font-size:17px;color:#fff;text-shadow:0 3px 14px #0008;opacity:0;pointer-events:none}.floating-score.big{font-size:25px;color:#ffe18b}.floating-score.show{animation:floatScore .7s ease-out forwards}.score-pulse{animation:scorePulse .35s ease-out}.record-pulse{animation:recordPulse .55s ease-out}.confetti{position:fixed;z-index:70;inset:0;pointer-events:none;overflow:hidden}.confetti i{position:absolute;width:7px;height:13px;background:hsl(var(--h) 90% 65%);animation:fall 1.5s linear forwards}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:16px}.mode-card{text-align:left;padding:15px;border-radius:17px;background:#ffffff07;border:1px solid #ffffff0b;color:var(--text);min-height:125px;transition:transform .12s,border-color .2s,background .2s}.mode-card.active{border-color:#8067ff77;background:#8067ff12}.mode-icon{display:block;font-size:23px;margin-bottom:13px}.mode-card strong{display:block;font-size:13px}.mode-card small{display:block;color:var(--muted);margin-top:5px;line-height:1.35}
.tile.v2{background:linear-gradient(135deg,#293553,#202a43);color:#eef}.tile.v4{background:linear-gradient(135deg,#354361,#273550)}.tile.v8{background:linear-gradient(135deg,#ff8a5b,#f5576c)}.tile.v16{background:linear-gradient(135deg,#ff6b8a,#c64bff)}.tile.v32{background:linear-gradient(135deg,#ff4e92,#8067ff)}.tile.v64{background:linear-gradient(135deg,#8067ff,#3e8cff)}.tile.v128{background:linear-gradient(135deg,#2e9bff,#30d6c0);box-shadow:0 0 25px #30d6c033}.tile.v256{background:linear-gradient(135deg,#25d6a4,#a2ed54);box-shadow:0 0 28px #25d6a433}.tile.v512{background:linear-gradient(135deg,#ffcf4a,#ff8d45);box-shadow:0 0 30px #ffb63b44}.tile.v1024{background:linear-gradient(135deg,#ff7b54,#ff3d81);box-shadow:0 0 35px #ff4f774d}.tile.v2048{background:linear-gradient(135deg,#f6d365,#fda085);box-shadow:0 0 42px #ffc45a66;color:#fff}.tile.v4096{background:linear-gradient(135deg,#fff,#bca9ff);box-shadow:0 0 45px #a98cff88;color:#201a38}.tile.v8192{background:linear-gradient(135deg,#d7fff7,#45e0cc);box-shadow:0 0 50px #45e0cc77;color:#082c2a}.tile.vbig{background:linear-gradient(135deg,#fff,#ff5dc8,#8067ff);box-shadow:0 0 55px #ff5dc877}
@keyframes pop{0%{opacity:0;transform:scale(.15)}70%{transform:scale(1.08)}100%{opacity:1;transform:scale(1)}}@keyframes merge{0%{transform:scale(.9)}45%{transform:scale(1.14)}100%{transform:scale(1)}}@keyframes modalIn{from{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}@keyframes floatScore{0%{opacity:0;transform:translate(-50%,12px) scale(.9)}20%{opacity:1}100%{opacity:0;transform:translate(-50%,-42px) scale(1.05)}}@keyframes scorePulse{50%{transform:scale(1.12);color:#d9d2ff}}@keyframes recordPulse{0%{transform:scale(1)}35%{transform:scale(1.16);color:#ffe18b}100%{transform:scale(1)}}@keyframes fall{to{transform:translateY(115vh) rotate(540deg);opacity:0}}
@media(max-width:420px){.app{padding-left:12px;padding-right:12px}.brand p{display:none}.brand-mark{width:43px;height:43px}.hud{gap:6px}.score-card{padding:9px}.controls{gap:6px}.primary-btn,.secondary-btn{padding:0 12px}.bottom-nav span{font-size:8px}.modal{padding:19px}.mode-grid{gap:7px}.mode-card{min-height:112px;padding:12px}}
@media(orientation:landscape) and (max-height:600px){.app{width:min(100%,920px);display:grid;grid-template-columns:minmax(300px,1fr) minmax(300px,540px);grid-template-areas:'top board' 'hud board' 'controls board' 'nav board';gap:8px;align-items:start}.topbar{grid-area:top}.hud{grid-area:hud;margin:0}.controls{grid-area:controls}.board-wrap{grid-area:board;grid-row:1 / span 4}.bottom-nav{grid-area:nav;margin:0}.board{max-height:calc(100svh - 20px)}}
@media(min-width:700px){.app{padding-left:24px;padding-right:24px}.bottom-nav button{padding:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}.floating-score,.confetti{display:none}}

/* Premium navigation + leaderboard/audio polish */
.app{padding-bottom:calc(108px + env(safe-area-inset-bottom))}
.icon-btn{display:grid;place-items:center}
.icon-btn svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.bottom-nav{
  position:fixed;z-index:45;left:50%;bottom:0;transform:translateX(-50%);
  width:min(calc(100% - 24px),736px);margin:0;
  grid-template-columns:repeat(5,1fr);gap:4px;
  padding:7px 7px max(8px,env(safe-area-inset-bottom));
  border:1px solid #ffffff12;border-bottom:0;border-radius:22px 22px 0 0;
  background:color-mix(in srgb,var(--panel) 91%,transparent);
  box-shadow:0 -12px 38px #0003;backdrop-filter:blur(20px);
}
.bottom-nav button{
  min-height:52px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:3px;background:transparent;border:0;border-radius:15px;color:var(--muted);
  font-size:9px;font-weight:800;letter-spacing:.01em;transition:background .18s,color .18s,transform .12s;
}
.bottom-nav button svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s}
.bottom-nav button span{font-size:9px;margin:0}
.bottom-nav button.active{color:var(--text);background:#8067ff18;box-shadow:inset 0 0 0 1px #8067ff26}
.bottom-nav button.active svg{color:var(--accent2);transform:translateY(-1px)}
.bottom-nav button:active{transform:scale(.96)}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.modal-head h2{margin-bottom:0}
.modal-close{width:38px!important;min-width:38px!important;height:38px;min-height:38px!important;padding:0!important;border-radius:12px!important;background:#ffffff08!important;border:1px solid #ffffff0d!important;font-size:24px!important;line-height:1}
.leaderboard-tabs{display:flex;gap:7px;overflow:auto;padding:4px 1px 10px;margin-top:8px;scrollbar-width:none}
.leaderboard-tabs::-webkit-scrollbar{display:none}
.leaderboard-tabs button{flex:0 0 auto;min-height:40px;border-radius:12px;padding:0 13px;background:#ffffff07;border:1px solid #ffffff0d;color:var(--muted);font-size:11px;font-weight:850}
.leaderboard-tabs button.active{background:#8067ff1c;border-color:#8067ff55;color:var(--text)}
.leader-list{display:flex;flex-direction:column;gap:6px;margin-top:4px}
.leader-row{min-height:56px;display:grid;grid-template-columns:42px 32px minmax(0,1fr) auto;align-items:center;gap:8px;padding:7px 10px;border:1px solid #ffffff08;background:#ffffff05;border-radius:15px}
.leader-row.me{background:linear-gradient(90deg,#8067ff18,#30d6c010);border-color:#8067ff50;box-shadow:inset 3px 0 0 var(--accent)}
.leader-row:first-child{background:linear-gradient(90deg,#ffd56a18,#8067ff0d);border-color:#ffd56a33}
.leader-row .rank{font-weight:900;color:var(--muted);font-size:12px;text-align:center}
.leader-row .rank.top{font-size:18px}
.avatar{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;overflow:hidden;background:#ffffff0b;color:var(--muted)}
.avatar img{width:100%;height:100%;object-fit:cover}
.avatar svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7}
.player-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;font-weight:750}
.leader-row strong{font-size:13px;font-variant-numeric:tabular-nums}
.leader-me{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:12px;margin-top:9px;padding:12px 13px;border-radius:15px;background:#8067ff16;border:1px solid #8067ff3d}
.leader-me span{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-weight:800}
.leader-me strong{font-size:17px}.leader-me b{font-size:13px}.leader-me.muted{grid-template-columns:1fr auto}.leader-me.muted b{color:var(--muted);font-size:10px}
.leaderboard-footnote{font-size:10px!important;text-align:center;margin:12px 0 0}
.leaderboard-empty{display:grid;place-items:center;text-align:center;padding:28px 12px}
.leaderboard-empty.small{padding:24px}
.leaderboard-empty h3{margin:10px 0 4px}.leaderboard-empty p{max-width:320px;margin:0 auto 14px}
.lb-symbol{width:54px;height:54px;display:grid;place-items:center;border-radius:17px;background:#8067ff18;color:var(--accent)}
.lb-symbol svg{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.leaderboard-loading{display:grid;place-items:center;min-height:180px;color:var(--muted);font-size:12px}
.spinner{width:24px;height:24px;border:2px solid #ffffff15;border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}
.settings-section{padding:12px 0;border-bottom:1px solid #ffffff09}
.settings-section h3{margin:0 0 4px;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.1em}
.range-row{display:grid;gap:7px;padding:11px 0}.range-row span{font-size:11px;color:var(--muted)}
.range-row input{width:100%;accent-color:var(--accent)}
.settings-note{font-size:10px!important;margin-bottom:0}
@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:420px){
  .bottom-nav{width:calc(100% - 14px);padding-left:4px;padding-right:4px;border-radius:18px 18px 0 0}
  .bottom-nav button{min-height:50px}.bottom-nav button svg{width:20px;height:20px}.bottom-nav button span{font-size:8px}
  .app{padding-bottom:calc(104px + env(safe-area-inset-bottom))}
}
@media(orientation:landscape) and (max-height:600px){
  .bottom-nav{position:static;transform:none;width:auto;padding:5px;border-radius:16px;margin:0}
  .app{padding-bottom:18px}
}
@media(prefers-reduced-motion:reduce){
  .bottom-nav button svg{transform:none!important}
}