@import url('https://fonts.googleapis.com/css2?family=Golos+Text:wght@400;500;600;700;800;900&family=IBM+Plex+Mono:wght@400;500;600;700&display=swap');
:root{--bg:#10121c;--text:#eeeff8;--muted:#7b7f97;--lime:#baf76c;--mono:'IBM Plex Mono',monospace;--sans:'Golos Text',Arial,sans-serif;--tile-h:11.111111%;--tile-w:20%}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);min-height:100svh;overflow-x:hidden}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;touch-action:manipulation}button:focus-visible,a:focus-visible,.board:focus-visible{outline:2px solid var(--lime);outline-offset:5px}button{transition:background .15s,transform .15s}button:active{transform:translateY(2px)}.ambient{position:fixed;pointer-events:none;z-index:-1;border-radius:50%;filter:blur(90px);opacity:.09}.ambient-a{width:500px;height:500px;background:#6950da;top:140px;left:20%}.ambient-b{width:260px;height:260px;background:#488f77;right:2%;bottom:0}header{height:84px;border-bottom:1px solid #ffffff0c;max-width:1380px;margin:auto;padding:0 42px;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{text-decoration:none;color:var(--text);font:800 23px var(--sans);letter-spacing:-1px;display:flex;align-items:center}.brand>span:not(.brand-symbol){color:var(--lime)}.brand-symbol{color:var(--lime);font-size:34px;margin-right:12px;transform:rotate(180deg);line-height:1}.brand i{font:9px var(--mono);color:#8b90a5;border:1px solid #373b4a;border-radius:4px;padding:3px 4px;align-self:flex-start;margin:1px 0 0 10px;letter-spacing:0}.header-note{font:9px var(--mono);letter-spacing:1.5px;color:#686d86}.header-actions{display:flex;align-items:center;gap:17px}.header-actions button{background:none;border:0;color:#9399af;font:12px var(--mono);padding:7px}.header-actions #pause{border:1px solid #34384b;border-radius:7px;width:34px;height:34px}.header-actions #sound{font-size:19px}.header-actions #sound span{font:10px var(--sans);margin-left:5px}.arcade{max-width:1150px;margin:34px auto 0;display:grid;grid-template-columns:250px minmax(320px,430px) 190px;justify-content:center;gap:40px;padding:0 24px;align-items:start}.left-rail{padding-top:32px}.eyebrow{font:8px var(--mono);color:#949bb3;letter-spacing:1.5px;display:flex;align-items:center;gap:7px}.eyebrow i,.live-dot{width:5px;height:5px;background:var(--lime);display:inline-block;border-radius:50%;box-shadow:0 0 10px #baf76c55}h1{font-size:43px;line-height:1.07;letter-spacing:-2px;font-weight:600;margin:20px 0 17px}h1>span{color:var(--lime)}.intro{font-size:12px;color:#80859b;line-height:1.9;margin:0}.score-panel{margin-top:42px}.label{font:8px var(--mono);letter-spacing:1.4px;color:#767d94}.score-panel>strong{display:block;font:500 58px var(--mono);letter-spacing:-4px;margin:5px 0 10px;line-height:1.1}.best{font:8px var(--mono);letter-spacing:1.3px;color:#7e849e;display:flex;gap:12px}.best span:first-of-type{color:#b7bed0}.best span:last-of-type{color:var(--lime)}.combo{display:flex;align-items:center;gap:13px;margin-top:38px}.combo-mark{display:grid;place-items:center;border:1px solid #343c30;background:#1d2721;width:42px;height:48px;border-radius:10px;font:35px var(--mono);color:var(--lime)}.combo>div{display:flex;flex-direction:column;gap:5px}.combo strong{font:500 25px var(--mono);color:var(--lime)}.combo div>span{font:8px var(--mono);letter-spacing:1px;color:#808b78}.last-match{margin-top:38px;border-top:1px solid #ffffff10;padding-top:18px;max-width:220px}.last-match p{font:11px/1.8 var(--mono);color:#b0b5c8;min-height:35px;margin-top:11px}.game-column{min-width:0}.board-heading{font:8px var(--mono);letter-spacing:1.2px;display:flex;justify-content:space-between;align-items:center;color:#797f99;margin-bottom:13px;gap:8px}.board-heading>span:first-child{display:flex;align-items:center;gap:9px;color:#c6cbdd}.board-heading b{font-weight:400}.board{position:relative;width:100%;aspect-ratio:5/7.05;overflow:hidden;border:1px solid #3a3e55;border-radius:13px;background:#141825;box-shadow:0 0 0 6px #ffffff02,0 24px 70px #00000045;outline:none;touch-action:none;isolation:isolate}.lanes{position:absolute;inset:0;display:grid;grid-template-columns:repeat(5,1fr);background:repeating-linear-gradient(to bottom,transparent 0,transparent calc(11.111111% - 1px),#ffffff05 calc(11.111111% - 1px),#ffffff05 11.111111%)}.lanes i{border-right:1px solid #ffffff05}.danger-line{position:absolute;top:11.111111%;width:100%;border-bottom:1px dashed #f78f7b40;height:0;z-index:1}.danger-line span{position:absolute;top:-14px;left:10px;color:#996568;font:6px var(--mono);letter-spacing:1.3px}.tile{position:absolute;width:calc(var(--tile-w) - 6px);height:calc(var(--tile-h) - 6px);left:calc(var(--col) * var(--tile-w) + 3px);top:calc(var(--row) * var(--pitch) + 3px);border-radius:7px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:3px;line-height:1.3;border:1px solid #ffffff25;box-shadow:inset 0 2px 0 #ffffff0e,0 3px 0 #00000030;user-select:none;overflow:hidden;font:500 clamp(10px,1.2vw,15px) var(--mono);letter-spacing:-.6px}.tile[hidden]{display:none}.tile small{font:500 10px var(--mono);letter-spacing:-.5px;opacity:.9}.tile .tile-unit{font-size:.77em;font-weight:400;opacity:.9}.tone-0{background:#3e416a;color:#ddd8ff;border-color:#616097}.tone-1{background:#2c5256;color:#b9e4da;border-color:#447b78}.tone-2{background:#64513b;color:#efd5ad;border-color:#90754a}.tone-3{background:#36466b;color:#c3d3ff;border-color:#546d9b}.terrain-tile{transition:top .22s ease;z-index:2}.terrain-tile.mistake{border-color:#ffac8377}.falling{z-index:5;color:#182014;background:var(--lime);border-color:#dcff9f;box-shadow:0 0 22px #baf76c30,inset 0 2px 0 #e2ffad;transition:left .07s ease;font-weight:600;will-change:top}.falling:after{content:'';position:absolute;left:25%;right:25%;bottom:4px;height:2px;background:#20341830;border-radius:1px}.ghost{z-index:1;border:1px dashed #c2f77f4d;background:#baf76c06;box-shadow:none;color:#baf76c4a;font-size:19px;transition:left .07s ease}.ghost:after{content:'⌄'}.board-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:16px;gap:12px}.level-track{display:flex;gap:5px}.level-track i{width:19px;height:3px;border-radius:2px;background:#303648}.level-track i.done{background:var(--lime);box-shadow:0 0 7px #baf76c33}#rise-note{font:7px var(--mono);letter-spacing:.8px;color:#717891}.controls{display:flex;gap:9px;margin-top:19px;align-items:center}.controls button{background:#1c2030;border:1px solid #363d53;border-bottom:3px solid #30364a;border-radius:7px;color:#b9c0d7;height:42px;flex:1;font:22px var(--mono)}.controls #drop{flex:3.7;font:9px var(--mono);letter-spacing:1px;display:flex;align-items:center;justify-content:center;gap:15px}.controls #drop span{font-size:8px;color:#858da5;border:1px solid #3d455d;border-radius:3px;padding:4px}.controls #drop b{font-size:18px;color:var(--lime);font-weight:400}.controls button:hover{background:#262d42}.right-rail{padding-top:61px}.rule-number{font:8px var(--mono);letter-spacing:1.3px;color:#9197ac}.key-demo{display:flex;gap:7px;margin-top:15px}kbd{display:grid;place-items:center;width:35px;height:32px;border:1px solid #3b4258;border-bottom:3px solid #3b4258;border-radius:6px;background:#1b1e2b;color:#bcc5d8;font:20px var(--mono)}.right-rail>p{color:#7e869f;font-size:11px;line-height:1.8;margin-top:14px}.second-rule{margin-top:35px}.space-demo{margin-top:15px;display:flex;justify-content:space-between;align-items:center;width:105px;border:1px solid #3b4258;border-bottom:3px solid #3b4258;border-radius:6px;padding:8px 10px;font:8px var(--mono);color:#b5bdd4;background:#1b1e2b}.space-demo span{font-size:14px;color:var(--lime)}.small-rule{color:#777f96;line-height:1.8;font-size:10px;margin-top:27px;border-top:1px solid #ffffff0d;padding-top:20px;max-width:153px}.small-rule>span{color:var(--lime);padding-right:5px}.difficulty{margin-top:44px}.difficulty .label{font-size:7px;letter-spacing:.6px}.skill{font-size:10px;color:#525b73;display:flex;align-items:center;gap:9px;margin-top:14px}.skill i{width:5px;height:5px;border:1px solid #475067;border-radius:50%}.skill.active{color:#b4c5a3}.skill.active i{background:var(--lime);border-color:var(--lime)}footer{max-width:1230px;display:flex;justify-content:space-between;gap:20px;margin:30px auto 0;padding:20px 36px 22px;border-top:1px solid #ffffff09;font:7px var(--mono);letter-spacing:1px;color:#666d83}footer i{font-style:normal;margin:0 12px;color:#49516b}.overlay{position:absolute;inset:0;z-index:10;background:linear-gradient(#131724ec,#131724df);display:grid;place-items:center;padding:30px;backdrop-filter:blur(5px)}.overlay[hidden]{display:none}.overlay-content{max-width:290px;text-align:center}.mini-blocks{display:flex;flex-direction:column;align-items:center;margin:0 auto 25px}.mini-blocks span{font:500 16px var(--mono);border-radius:7px;padding:13px 14px;min-width:108px;background:var(--lime);color:#1c2517;box-shadow:0 0 30px #baf76c12;transform:rotate(-5deg)}.mini-blocks span:last-child{background:#3e416a;color:#e1dcff;transform:rotate(4deg);border:1px solid #646298}.mini-blocks i{font:18px var(--mono);font-style:normal;color:#baf76c87;margin:7px 0}.overlay h2{font-size:29px;font-weight:600;letter-spacing:-1px;line-height:1.15;margin:20px 0 13px}.overlay p{color:#9da5bb;font-size:12px;line-height:1.8;margin:0 auto 25px;max-width:245px}.play-button{display:flex;justify-content:space-between;align-items:center;background:var(--lime);border:0;border-bottom:3px solid #82b14a;color:#202916;border-radius:7px;width:100%;padding:15px 19px;font:600 11px var(--mono);letter-spacing:1px}.play-button:hover{background:#ccff8d}.play-button span{font-size:21px;line-height:1}.overlay-note{display:block;color:#68738c;font-size:9px;margin-top:15px;line-height:1.6}.board.paused .mini-blocks,.board.ended .mini-blocks{display:none}.board.ended .overlay h2{color:var(--lime)}.pop{position:absolute;left:calc(var(--col) * 20%);top:calc(var(--row) * var(--pitch));width:20%;text-align:center;color:#d0ff9a;font:600 22px var(--mono);z-index:8;pointer-events:none;animation:pop .8s ease-out forwards;text-shadow:0 2px 10px #0e152a}.spark{position:absolute;width:5px;height:5px;background:var(--lime);left:var(--x);top:calc(var(--row) * var(--pitch));z-index:8;pointer-events:none;animation:spark .6s ease-out forwards;border-radius:1px}.toast{position:absolute;top:35%;left:5%;right:5%;text-align:center;font:600 14px var(--mono);color:var(--lime);z-index:7;pointer-events:none;text-shadow:0 2px 8px #000;animation:toast 1.7s both}.board.hit{animation:shake .28s}.board.rising{animation:riseglow .6s}.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}@keyframes pop{to{transform:translateY(-50px) scale(1.2);opacity:0}}@keyframes spark{to{transform:translate(var(--dx),var(--dy)) rotate(150deg);opacity:0}}@keyframes toast{0%,100%{opacity:0;transform:translateY(8px)}20%,75%{opacity:1;transform:translateY(0)}}@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}@keyframes riseglow{40%{border-color:#baf76c;box-shadow:0 0 30px #baf76c22}}
@media(min-width:801px) and (max-height:900px){header{height:65px}.arcade{margin-top:23px;grid-template-columns:230px minmax(300px,370px) 170px;gap:35px}.board{aspect-ratio:5/6.8}h1{font-size:39px}.left-rail{padding-top:25px}.score-panel{margin-top:30px}.score-panel>strong{font-size:51px}.combo{margin-top:27px}.last-match{margin-top:29px}.right-rail{padding-top:47px}.difficulty{margin-top:32px}.controls{margin-top:14px}.board-bottom{margin-top:12px}footer{margin-top:22px;padding-top:17px}.tile{font-size:13px}.tile small{font-size:9px}.mini-blocks{margin-bottom:18px}.overlay h2{font-size:27px}}
@media(max-width:1050px) and (min-width:801px){.arcade{grid-template-columns:190px minmax(300px,370px) 140px;gap:25px}.header-note{font-size:7px}.eyebrow{font-size:7px;letter-spacing:.8px}h1{font-size:36px}.difficulty .label{font-size:6px}.right-rail>p{font-size:10px}.small-rule{font-size:9px}.last-match{max-width:180px}}
@media(max-width:800px){header{height:63px;padding:0 23px}.header-note{display:none}.brand{font-size:21px}.arcade{max-width:610px;grid-template-columns:1fr;margin-top:17px;padding:0 22px;gap:17px}.right-rail,.intro,.left-rail h1,.left-rail .eyebrow,.last-match,.score-panel .best{display:none}.left-rail{display:flex;justify-content:space-between;align-items:center;padding:0}.score-panel{margin:0;display:flex;gap:15px;align-items:center}.score-panel>strong{font-size:30px;letter-spacing:-1.5px;margin:0}.combo{margin:0;gap:8px}.combo-mark{width:26px;height:31px;font-size:24px;border-radius:6px}.combo strong{font-size:21px}.combo div>span{display:none}.game-column,.left-rail{width:min(100%,430px);margin:auto}.board{aspect-ratio:5/6.8}.tile{font-size:15px}.tile small{font-size:10px}footer{max-width:530px;margin:20px auto 0;padding:16px 22px;font-size:7px;letter-spacing:.2px;justify-content:center}footer>span:first-child{display:none}.controls{margin-top:14px}.controls button{height:44px}.overlay h2{font-size:27px}.mini-blocks{margin-bottom:18px}.board-heading{font-size:7px}.board-bottom{margin-top:12px}}
@media(max-width:440px){header{height:56px;padding:0 18px}.brand{font-size:19px}.brand-symbol{font-size:27px}.header-actions{gap:9px}.header-actions #sound span{display:none}.arcade{padding:0 16px;margin-top:13px;gap:13px}.board{aspect-ratio:5/6.65}.tile{font-size:12px;letter-spacing:-.4px;border-radius:5px}.tile small{font-size:8px}.score-panel>strong{font-size:27px}.score-panel>.label{font-size:7px}.controls button{height:40px}.controls #drop{font-size:8px}.controls{margin-top:12px}.board-bottom{margin-top:11px}#rise-note{font-size:6px}.level-track i{width:15px}.overlay{padding:24px}.overlay h2{font-size:25px}.overlay p{font-size:11px;line-height:1.7;margin-bottom:19px}.mini-blocks span{font-size:13px;padding:10px 12px}.mini-blocks{margin-bottom:13px}.play-button{padding:13px 16px}.board-heading{font-size:6px;letter-spacing:1px}.overlay-note{font-size:8px}footer{margin-top:16px;padding:12px 13px;font-size:6px}footer i{margin:0 7px}}
/* Keep units on their own line so grouped numbers have the full block width. */
.tile{letter-spacing:0;font-variant-numeric:tabular-nums lining-nums}
.tile-main{display:flex;flex-direction:column;align-items:center;gap:3px;max-width:100%;line-height:1.1}
.tile-number{white-space:nowrap;letter-spacing:.15px;font-weight:600}
.tile-number.long-number{font-size:.88em;letter-spacing:0}
.tile .tile-unit{font-size:9px;letter-spacing:.2px;line-height:1.1}
.tile small{font-size:8px;letter-spacing:0;white-space:nowrap;margin-top:4px;line-height:1.1}
.mini-blocks span{white-space:nowrap}
/* Give the game most of the screen; size text for the wider cells. */
header{height:60px}
.arcade{max-width:1440px;margin-top:18px;grid-template-columns:200px minmax(0,680px) 160px;gap:28px}
.board{aspect-ratio:auto;height:clamp(480px,calc(100svh - 200px),850px)}
.tile{font-size:22px;padding:2px 4px;container-type:inline-size}
.tile-number.long-number{font-size:min(.88em,calc(100cqw / var(--number-em,6)))}
.tile-main{gap:4px}
.tile .tile-unit{font-size:13px;opacity:1}
.tile small{font-size:15px;opacity:1;margin-top:3px}
.formula-main{flex-direction:row;align-items:baseline;gap:6px;line-height:1.05}
.formula-main .tile-number{font-size:.9em}
.board-heading{font-size:10px}
.last-match p{font-size:14px}
.left-rail h1{font-size:36px}
.controls{margin-top:12px}
.board-bottom{margin-top:12px}
@media(max-width:1150px) and (min-width:801px){
  .arcade{grid-template-columns:180px minmax(0,680px);gap:24px}
  .right-rail{display:none}
}
@media(max-width:800px){
  .arcade{max-width:720px;grid-template-columns:1fr;padding:0 16px;gap:14px;margin-top:14px}
  .game-column,.left-rail{width:100%}
  .board{height:clamp(600px,calc(100svh - 230px),850px)}
  .tile{font-size:20px}
  .tile small{font-size:min(13px,14cqw)}
  .formula-main{flex-direction:column;align-items:center;gap:2px}
}
@media(max-width:500px){
  .board{height:clamp(540px,calc(100svh - 230px),850px)}
  .tile{font-size:15px;padding:3px;container-type:inline-size}
  .tile-number.long-number{font-size:min(.88em,calc(100cqw / var(--number-em,6)))}
  .tile .tile-unit{font-size:11px}
  .formula-main{flex-direction:column;align-items:center;gap:2px}
  .formula-main .tile-number{font-size:1em}
  .tile small{font-size:clamp(8px,14cqw,11px);margin-top:4px}
  .board-heading{font-size:7px}
}
.scenario{margin-top:20px}
.left-rail .scenario h2{font-size:27px;line-height:1.2;letter-spacing:-.8px;margin:12px 0}
#scenario-copy{font-size:14px;line-height:1.7;color:#c1c8da;margin:0}
.scenario-legend{font:10px/1.7 var(--mono);color:#919bb2;margin-top:12px}
.tile .tile-unit{overflow-wrap:anywhere}
.tile .formula-main .tile-unit{font-size:min(13px,11cqw)}
.tile small{font-size:min(15px,13cqw)}
@media(max-width:800px){
  .left-rail{flex-wrap:wrap;gap:12px}
  .scenario{order:3;flex-basis:100%;margin:0;padding:12px 15px;background:#1c2030;border-radius:8px}
  .left-rail .scenario h2{display:block;font-size:19px;margin:5px 0}
  #scenario-copy{font-size:13px;line-height:1.5}
  .scenario-legend{margin-top:6px}
  .tile small{font-size:min(12px,13cqw)}
}
@media(prefers-reduced-motion:reduce){.terrain-tile,.falling,.ghost{transition:none}.pop,.spark,.toast,.board.hit,.board.rising{animation-duration:.01ms}}

/* Keep the question beside its moving data, in the player's line of sight. */
.game-column .scenario{margin:0 0 16px;padding:16px 20px;background:#1c2030;border:1px solid #343b50;border-radius:12px}
.scenario-heading{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.scenario-heading h2{font-size:20px;line-height:1.2;letter-spacing:-.4px;margin:0}
.game-column #scenario-copy{font-size:16px;line-height:1.5;margin:10px 0 12px}
.scenario-goal{display:flex;align-items:baseline;gap:12px;color:var(--lime)}
.scenario-goal>span{font:10px var(--mono);letter-spacing:1px}
.scenario-goal strong{font-size:19px;line-height:1.35;font-weight:600}
.game-column .scenario-legend{margin-top:10px;font-size:10px}
.tile .formula-main{flex-direction:row;align-items:baseline;gap:5px}
.tile .formula-main .tile-number{font-size:min(.9em,calc(65cqw / var(--number-em,6)))}
.tile .formula-main .tile-unit{font-family:var(--sans);font-size:min(13px,13cqw);white-space:nowrap}
.tile small{font-family:var(--sans);font-size:min(14px,12cqw);line-height:1.15;margin-top:3px}
@media(max-width:800px){
  .game-column .scenario{padding:12px 14px}
  .scenario-heading{gap:7px}
  .scenario-heading h2{font-size:18px}
  .game-column #scenario-copy{font-size:14px}
  .scenario-goal{gap:8px}
  .scenario-goal strong{font-size:17px}
  .game-column .scenario-legend{font-size:9px}
}

.tile .tile-unit{font-family:var(--sans)}
@media(max-width:800px){.tile .formula-main{flex-direction:column;align-items:center;gap:2px}.tile .formula-main .tile-number{font-size:min(1em,calc(100cqw / var(--number-em,6)))}}


/* The board gets the remaining viewport height; everything else lives beside it. */
.terrain-tile.matched{animation:clear-match .4s ease-in forwards;pointer-events:none}
.board.paused .terrain-tile.matched{animation-play-state:paused}
@keyframes clear-match{
  0%,25%{background:var(--lime);color:#182014;border-color:#e0ffbd;box-shadow:0 0 26px #baf76c80;opacity:1;transform:scale(1)}
  100%{opacity:0;transform:scale(.35);visibility:hidden}
}
@media(prefers-reduced-motion:reduce){.terrain-tile.matched{animation-duration:.01ms}}
:root{--tile-h:20%;--pitch:20%}
html{height:100%}
body{height:100svh;min-height:0;display:grid;grid-template-rows:52px minmax(0,1fr)}
header{height:52px;width:100%;max-width:1440px;padding:0 24px}
.arcade{width:100%;height:100%;min-height:0;max-width:1440px;margin:0 auto;padding:12px 24px;grid-template-columns:260px minmax(0,1080px);gap:24px;align-items:stretch}
.left-rail{padding:16px 0 0;min-width:0;min-height:0;display:flex;flex-direction:column;align-items:stretch;gap:16px}
.score-panel{margin:0}
.score-panel>strong{font-size:44px;margin:5px 0}
.combo{margin:0}
.combo-mark{height:36px;width:34px;font-size:26px}
.combo strong{font-size:22px}
.game-column,.reviewing .game-column{width:100%;height:100%;min-height:0;margin:0;display:grid;grid-template-rows:auto auto minmax(220px,1fr);gap:8px}
.board-heading{margin:0;font-size:10px;line-height:16px}
.game-column .scenario{order:0;flex-basis:auto;margin:0;padding:12px 16px}
.scenario-heading{gap:12px}
.scenario-heading h2{font-size:19px}
.game-column #scenario-copy{margin:7px 0;font-size:16px;line-height:1.4}
.scenario-goal strong{font-size:18px;line-height:1.3}
.game-column .scenario-legend{margin-top:6px;font-size:10px;line-height:1.3}
.board{height:100%;min-height:0;aspect-ratio:auto;box-shadow:0 8px 30px #00000025}
.lanes{background:none}
.tile{font-size:24px;padding:2px 4px}
.tile .formula-main{flex-direction:row;align-items:baseline;gap:5px}
.tile .formula-main .tile-number{font-size:min(.9em,calc(65cqw / var(--number-em,6)))}
.tile .tile-unit{font-size:14px}
.tile small{font-size:min(14px,11cqw);margin-top:2px}
.controls{display:grid;grid-template-columns:1fr 1fr;margin:0;gap:8px;flex-shrink:0}
.controls button{height:38px}
.controls #left{grid-column:1;grid-row:1}
.controls #right{grid-column:2;grid-row:1}
.controls #drop,.controls #next{grid-column:1 / -1;grid-row:2}
.controls [hidden]{display:none!important}
.controls #next{grid-row:1;height:auto;min-height:44px;padding:8px;font:600 14px var(--sans);background:var(--lime);color:#182014;border-color:#8bb755;display:flex;align-items:center;justify-content:center;gap:10px}
.controls #next span{font:10px var(--mono);white-space:nowrap}
.last-match{display:block;flex:1;max-width:none;margin:0;padding:12px;border:1px solid #ffffff0c;border-radius:8px;min-height:0;overflow:auto;background:#151925}
.last-match .label{font-size:9px}
.last-match p{font:14px/1.55 var(--sans);margin:8px 0 0;min-height:0;color:#c3ccdf}
.reviewing .last-match{border-color:#b59356;background:#26251f}
.reviewing .last-match .label{color:#f0d7a4}
.side-note{font:10px/1.7 var(--sans);color:#8993a9}
.overlay{padding:16px}
.overlay-content{max-width:380px}
.overlay h2{font-size:25px;margin:0 0 10px}
.overlay p{font-size:12px;line-height:1.5;margin:0 auto 14px;max-width:350px}
.overlay-note{margin-top:8px}
.play-button{padding:12px 16px}
.header-actions #pause{width:auto;min-width:100px;height:34px;padding:6px 12px;font:500 12px var(--sans);color:var(--text);background:#242b3e;border-color:#56617c;white-space:nowrap}
.header-actions #pause:disabled{color:#929aae;cursor:default;background:#191e2b}
@media(max-height:720px){
  .left-rail{padding-top:4px;gap:10px}
  .left-rail .eyebrow{display:none}
  .score-panel>strong{font-size:36px}
  .game-column .scenario{padding:9px 14px}
  .game-column #scenario-copy{font-size:14px;line-height:1.35;margin:5px 0}
  .scenario-heading h2{font-size:17px}
  .scenario-goal strong{font-size:16px}
  .tile{font-size:22px}
}
/* Phone: status row, question, board, thumb controls. Both rails dissolve into one grid. */
@media(max-width:800px),(max-height:500px) and (orientation:landscape){
  html,body{overscroll-behavior:none}
  body{grid-template-rows:46px minmax(0,1fr);padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
  header{height:46px;padding:0 12px}
  .brand{font-size:19px}
  .brand-symbol{font-size:27px}
  .header-note{display:none}
  .header-actions{gap:5px}
  /* Rows are closer than a tile is tall, so the question and answers stay readable on a short board. */
  .arcade{--tile-h:clamp(72px,25%,108px);--pitch:calc((100% - var(--tile-h)) / 4);max-width:720px;padding:8px 10px 10px;gap:8px 12px;grid-template-columns:minmax(0,1fr) auto auto;grid-template-rows:auto minmax(0,auto) minmax(190px,1fr) auto;grid-template-areas:"score combo level" "scenario scenario scenario" "board board board" "controls controls controls"}
  .left-rail,.game-column,.reviewing .game-column{display:contents}
  .left-rail .eyebrow,.side-note,.score-panel>.label,.combo div>span,#stage,.last-match{display:none}
  .score-panel{grid-area:score;align-self:center;display:flex;align-items:baseline;gap:10px;margin:0}
  .score-panel>strong{font-size:22px;letter-spacing:-.5px;line-height:1;margin:0}
  .score-panel .best{display:flex;gap:6px;font-size:9px;letter-spacing:.8px}
  .combo{grid-area:combo;align-self:center;gap:6px;margin:0}
  .combo-mark{width:20px;height:24px;font-size:17px;border-radius:5px}
  .combo strong{font-size:16px}
  .board-heading{grid-area:level;align-self:center;font-size:9px;letter-spacing:.8px}
  .game-column .scenario{grid-area:scenario;min-height:0;overflow:auto;padding:9px 12px}
  .scenario-heading{gap:7px}
  .scenario-heading h2{font-size:17px}
  .game-column #scenario-copy{font-size:14px;line-height:1.35;margin:5px 0 6px}
  .scenario-goal{gap:8px}
  .scenario-goal strong{font-size:16px}
  .game-column .scenario-legend{font-size:9px}
  .board{grid-area:board;height:auto}
  .tile{width:calc(var(--tile-w) - 4px);height:calc(var(--tile-h) - 4px);left:calc(var(--col) * var(--tile-w) + 2px);top:calc(var(--row) * var(--pitch) + 2px);font-size:18px;padding:2px 1px}
  .tile .tile-number,.tile .tile-number.long-number,.tile .formula-main .tile-number{font-size:min(1em,calc(100cqw / var(--number-em,6)))}
  .tile .tile-unit,.tile .formula-main .tile-unit{font-size:clamp(9.5px,calc(100cqw / var(--unit-em,6)),13px);white-space:normal}
  .tile .formula-main{flex-direction:column;align-items:center;gap:1px}
  .tile small{font-size:10px;white-space:normal;text-wrap:balance;margin-top:2px}
  .falling:after{content:none}
  .pop{font-size:17px;white-space:nowrap}
  /* No room for a landing slot above the answers: ring the targeted answer instead. */
  .ghost{top:calc(100% - var(--tile-h));left:calc(var(--col) * var(--tile-w));width:var(--tile-w);height:var(--tile-h);z-index:3;border:2px solid var(--lime);border-radius:9px;background:none;box-shadow:0 0 14px #baf76c55;pointer-events:none}
  .ghost:after{content:none}
  .controls{grid-area:controls;grid-template-columns:1fr 1.7fr 1fr;-webkit-user-select:none;user-select:none}
  .controls button{height:52px}
  .controls #left,.controls #drop,.controls #right,.controls #next{grid-row:1}
  .controls #left,.controls #right{padding-bottom:5px}
  .controls #drop{grid-column:2;font-size:11px}
  .controls #right{grid-column:3}
  .controls #next{grid-column:1 / -1;min-height:52px;font-size:16px}
  /* The start and pause screens need more room than a short board has. */
  .overlay{position:fixed;inset:calc(46px + env(safe-area-inset-top)) 0 0;padding:24px;overflow:auto}
  .overlay h2{font-size:27px}
  .overlay p{font-size:14px;line-height:1.55;margin-bottom:20px}
  .play-button{padding:16px 18px;font-size:13px}
  .overlay-note{font-size:11px;margin-top:12px}
  /* The review covers the empty part of the board and leaves the answers in view. */
  .reviewing .last-match{display:block;grid-area:board;align-self:start;z-index:6;margin:8px;max-height:calc(100% - var(--tile-h) - 16px);box-shadow:0 10px 30px #0008}
}
@media(max-width:800px) and (max-height:700px),(max-height:500px) and (orientation:landscape){
  .game-column .scenario-legend{display:none}
}
@media(max-height:500px) and (orientation:landscape){
  body{grid-template-rows:40px minmax(0,1fr)}
  header{height:40px}
  .arcade{max-width:none;padding:6px 10px 8px;grid-template-columns:minmax(0,1fr) auto auto minmax(0,1.35fr);grid-template-rows:auto minmax(0,1fr) auto;grid-template-areas:"score combo level board" "scenario scenario scenario board" "controls controls controls board"}
  .game-column .scenario{align-self:start;max-height:100%}
  .controls button,.controls #next{height:44px;min-height:44px}
  .overlay{inset:calc(40px + env(safe-area-inset-top)) 0 0;padding:12px 24px}
  .overlay h2{font-size:22px}
  .overlay p{margin-bottom:12px}
}
@media(hover:none) and (pointer:coarse){
  .controls #drop span,.controls #next span{display:none}
}

/* The start screen doubles as the page search engines and link previews see: say what this is. */
.overlay{overflow:auto;place-items:safe center}
.overlay .overlay-kicker{font:600 11px/1.5 var(--mono);letter-spacing:1.2px;text-transform:uppercase;color:var(--lime);margin:0 0 12px}
.overlay .overlay-topics{font:11px/1.6 var(--mono);color:#8f97ad;margin:-4px auto 16px;max-width:340px}
.overlay-more{margin:14px auto 0;max-width:340px;text-align:left;font-size:12px;line-height:1.55;color:#a8b0c4}
.overlay-more summary{cursor:pointer;text-align:center;color:#8f97ad;font:11px var(--mono);letter-spacing:.6px}
.overlay-more ul{margin:10px 0 0;padding-left:18px}
.overlay-more li{margin-bottom:6px}
.overlay-more b{color:#d6dbe8;font-weight:600}
.board.paused .overlay-kicker,.board.paused .overlay-topics,.board.paused .overlay-more{display:none}

/* Language switch: one button per language, the current one lit. */
.lang-switch{display:flex;border:1px solid #34384b;border-radius:7px;overflow:hidden}
.header-actions .lang-switch button{height:32px;min-width:34px;padding:0 8px;font:600 11px var(--mono);letter-spacing:.5px;color:#9399af;background:none;border:0}
.header-actions .lang-switch button+button{border-left:1px solid #34384b}
.header-actions .lang-switch button[aria-pressed="true"]{background:#242b3e;color:var(--lime)}
/* Translated words sit in <i> where the markup needs a separate node; they are not italics. */
i[data-i18n],.play-button i,.controls #drop i,.controls #next i{font-style:normal}
@media(max-width:420px){.brand i{display:none}.header-actions .lang-switch button{min-width:30px;padding:0 6px}}
@media(max-width:420px){.header-actions #pause{min-width:0;width:38px;padding:0}.header-actions #pause span{display:none}}

/* Sound toggle: lit when on, struck through when off, so the state reads without the hidden label. */
.header-actions #sound{min-width:40px;height:40px;padding:0 8px}
.header-actions #sound[aria-pressed="true"]{color:var(--lime)}
.sound-icon{position:relative;display:inline-block;font-weight:400}
#sound[aria-pressed="false"] .sound-icon::after{content:'';position:absolute;left:50%;top:52%;width:2px;height:1.1em;background:currentColor;border-radius:1px;transform:translate(-50%,-50%) rotate(45deg)}