:root{color-scheme:light;--night:#24323d;--night-2:#1a252d;--paper:#f7f3e9;--card:#fffdf7;--ink:#2d3840;--muted:#718087;--line:#d9ddd6;--sage:#7f9b88;--gold:#d6ad64;--coral:#d97a70;--key:#ece9df;--key-edge:#b8beb8}
*{box-sizing:border-box}
html{background:var(--paper)}
body{margin:0;background:radial-gradient(circle at 82% 3%,#d8e4dc 0,transparent 27%),var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
.shell{width:min(1120px,calc(100% - 44px));margin:auto}
.site-header{height:82px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #d8ddd6}
.back{color:var(--ink);font-size:12px;font-weight:750;text-decoration:none}
.header-actions{display:flex;gap:10px;align-items:center}
.language-picker,.account-link{border:1px solid #d1d8d1;border-radius:9px;background:#fff9;color:var(--ink);padding:8px 10px;font:12px inherit}
.account-link{text-decoration:none;font-weight:750;color:#47695a}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
button:focus-visible,a:focus-visible,canvas:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.hero{padding:39px 0 27px}
.eyebrow,.panel-label{margin:0 0 10px;color:#718078;font-size:10px;font-weight:850;letter-spacing:.17em}
.hero h1{margin:0 0 10px;font-size:clamp(35px,5vw,52px);line-height:1.05;letter-spacing:-.045em}
.hero>p:last-child{max-width:650px;margin:0;color:var(--muted);font-size:14px;line-height:1.8}
.game-shell{display:grid;grid-template-columns:190px minmax(310px,390px) minmax(250px,1fr);gap:18px;align-items:start}
.preview-panel,.board-panel,.controls-panel{border:1px solid var(--line);border-radius:22px;background:var(--card);box-shadow:0 15px 40px #24323d0e}
.preview-panel,.controls-panel{padding:17px}
.preview-card{border:1px solid #e0e2da;border-radius:15px;background:#f3f1e9;text-align:center;padding:11px}
.preview-card>span{display:block;color:var(--muted);font-size:9px;font-weight:850;letter-spacing:.13em}
.preview-card canvas{display:block;width:96px;height:76px;margin:4px auto}
.preview-card small{color:#9aa29d;font:700 9px ui-monospace,monospace}
.next-card{margin-top:10px}
.next-list canvas+canvas{border-top:1px solid #dde1da}
.desktop-help{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}
.desktop-help p:not(.panel-label){margin:0;color:var(--muted);font-size:11px;line-height:1.7}
.desktop-help .record-note{margin-top:12px;padding:9px;border-radius:9px;background:#eef1ea;color:#5f7168}
.board-panel{padding:14px}
.hud{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-bottom:10px}
.hud div{min-width:0;padding:8px 9px;border-radius:11px;background:#eef0e9}
.hud span,.hud strong{display:block}
.hud span{color:var(--muted);font-size:8px;font-weight:850;letter-spacing:.1em}
.hud strong{margin-top:3px;overflow:hidden;font:800 17px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--night)}
.board-wrap{position:relative;width:min(100%,330px);aspect-ratio:3/5;margin:auto;border:4px solid #6f8177;border-radius:17px;overflow:hidden;background:#f3eee2;box-shadow:inset 0 0 0 1px #fff8,0 10px 22px #52645a1b}
.board-wrap.line-clear{animation:boardPulse .2s ease-out}
#blocks-canvas{display:block;width:100%;height:100%;touch-action:none;user-select:none;-webkit-user-select:none}
.game-overlay{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;background:#f3eee2ee;color:var(--ink);backdrop-filter:blur(3px)}
.game-overlay[hidden]{display:none}
.overlay-mark{width:52px;height:52px;display:grid;place-items:center;border-radius:16px;background:#d6ad64;color:#24323d;font-size:29px;box-shadow:0 5px 0 #876d3d}
.game-overlay h2{margin:16px 0 8px;font-size:22px}
.game-overlay p{max-width:250px;margin:0 0 19px;color:#65756d;font-size:12px;line-height:1.7}
.game-overlay button{border:0;border-radius:11px;background:#d6ad64;color:#1f2c34;padding:12px 25px;font:850 12px inherit;cursor:pointer;box-shadow:0 4px 0 #8f7545}
.game-overlay button:active{transform:translateY(3px);box-shadow:0 1px 0 #8f7545}
.board-pause{position:absolute;z-index:3;top:8px;right:8px;border:1px solid #ffffffa8;border-radius:9px;background:#53675ddd;color:#fff;padding:7px 10px;font:800 9px inherit;letter-spacing:.04em;cursor:pointer;box-shadow:0 3px 8px #3140392b}
.board-pause[hidden]{display:none}
.controls-panel{padding:19px}
.key{border:1px solid #c8cec8;background:linear-gradient(#faf9f4,#e7e5dc);color:var(--night);cursor:pointer;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;box-shadow:0 5px 0 var(--key-edge),inset 0 1px 0 #fff;border-radius:15px}
.key span,.key small{display:block}
.key small{margin-top:3px;color:#7a8683;font:800 8px inherit;letter-spacing:.09em}
.keypad{width:238px;margin:auto;display:grid;grid-template-columns:repeat(3,74px);grid-template-rows:repeat(2,70px);gap:8px;justify-content:center}
.key{font:850 27px inherit}
.key:active,.key.is-pressed{transform:translateY(4px);box-shadow:0 1px 0 var(--key-edge),inset 0 3px 7px #7c867b2c;background:linear-gradient(#dfddd4,#eeece5)}
.aux-key{font-size:12px}
.hold-key{grid-column:1;grid-row:1}
.rotate-key{grid-column:2;grid-row:1}
.drop-key{grid-column:3;grid-row:1;background:linear-gradient(#819b89,#65806f);color:#fff;border-color:#5a7465;box-shadow:0 5px 0 #42594b,inset 0 1px 0 #a8b9ad}
.drop-key small{color:#eef3ee}
.drop-key:active,.drop-key.is-pressed{background:linear-gradient(#5d7868,#718d7b);box-shadow:0 1px 0 #42594b,inset 0 3px 7px #1a29203d}
.left-key{grid-column:1;grid-row:2}
.down-key{grid-column:2;grid-row:2}
.right-key{grid-column:3;grid-row:2}
.touch-note{margin:17px 4px 11px;color:var(--muted);font-size:10px;line-height:1.6;text-align:center}
.game-count{border-top:1px solid var(--line);padding-top:11px;text-align:center;color:var(--muted);font-size:10px}
.game-count strong{color:var(--ink)}
footer{display:flex;justify-content:space-between;gap:15px;border-top:1px solid #d8ddd6;margin-top:39px;padding:22px 0 30px;color:var(--muted);font-size:10px}
@keyframes boardPulse{50%{box-shadow:inset 0 0 0 3px #fff8,0 11px 23px #1a252d24}}

@media(max-width:930px){
  .game-shell{grid-template-columns:160px minmax(290px,360px) minmax(245px,1fr)}
  .keypad{width:214px;grid-template-columns:repeat(3,66px);grid-template-rows:repeat(2,65px)}
}

@media(max-width:760px){
  .shell{width:calc(100% - 20px)}
  .site-header{height:70px}
  .account-link{padding:8px}
  .hero{padding:28px 4px 20px}
  .hero h1{font-size:38px}
  .hero>p:last-child{font-size:12px}
  .game-shell{grid-template-columns:1fr;gap:0}
  .board-panel{order:1;padding:0 1px 2px}
  .preview-panel{order:3;display:grid;grid-template-columns:112px 1fr;gap:10px;padding:10px}
  .preview-card{padding:7px}
  .preview-card canvas{width:82px;height:60px}
  .next-card{margin:0}
  .next-list{display:flex;justify-content:center}
  .next-list canvas{width:62px;height:60px;margin:4px 0}
  .next-list canvas+canvas{border-top:0;border-left:1px solid #dde1da}
  .desktop-help{display:none}
  .board-panel,.controls-panel{border:0;border-radius:0;background:transparent;box-shadow:none}
  .controls-panel{order:2;padding:5px 0 7px}
  .controls-panel>.panel-label{display:none}
  .board-wrap{width:min(calc(100vw - 28px),348px);aspect-ratio:3/5;border-width:3px;border-radius:14px}
  .hud{margin-bottom:7px}
  .hud div{padding:7px 8px}
  .hud strong{font-size:15px}
  .keypad{width:244px;grid-template-columns:repeat(3,76px);grid-template-rows:52px 58px;gap:8px}
  .aux-key{font-size:10px}
  .touch-note{display:none}
  .game-count{border:0;padding-top:4px;font-size:9px}
  footer{margin-top:25px;flex-wrap:wrap}
}

@media(max-width:380px){
  .hero{padding-top:23px}
  .hero h1{font-size:34px}
  .board-wrap{width:min(calc(100vw - 24px),336px)}
  .keypad{width:226px;grid-template-columns:repeat(3,70px);grid-template-rows:50px 56px;gap:8px}
  .preview-panel{grid-template-columns:100px 1fr}
  .next-list canvas{width:56px}
}

@media(prefers-reduced-motion:reduce){
  .board-wrap.line-clear{animation:none}
  .key:active,.key.is-pressed{transform:none}
}