:root{--paper:#f8f6ef;--ink:#253f39;--muted:#76827a;--line:#dedfd4;--coral:#ee714f;--mint:#dceacb;--cream:#fffdf7;font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit;color:inherit}button{border:1px solid var(--line);border-radius:9px;background:var(--cream);padding:11px 15px;cursor:pointer;font-weight:600;transition:background .15s,transform .15s}button:hover:not(:disabled){background:#eceee1;transform:translateY(-1px)}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #3178bf;outline-offset:3px}.primary{background:var(--coral);border-color:var(--coral);color:#fff}.primary:hover:not(:disabled){background:#dd5e3d}.dark{background:var(--ink);color:white}.quiet{border-color:transparent;background:transparent;font-size:13px}.wide{width:100%}[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h2{font-size:28px;letter-spacing:-1px}h3{font-size:16px;letter-spacing:-.35px;margin:0 0 5px}p{line-height:1.6}.small{font-size:12px}.muted{color:var(--muted)}.eyebrow{font:600 10px ui-monospace,SFMono-Regular,monospace;letter-spacing:2px}.pill{font:600 10px ui-monospace,monospace;border:1px solid var(--line);padding:8px 10px;border-radius:30px;white-space:nowrap}header{height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 4vw}.brand{display:flex;align-items:center;gap:12px;font-weight:750;font-size:23px;letter-spacing:-1px;color:inherit;text-decoration:none}.brand-icon{width:41px;height:44px;border:1.5px solid var(--ink);font-size:23px;position:relative;padding:12px 4px 0;line-height:1}.brand-icon small{position:absolute;top:4px;left:5px;font:9px ui-monospace,monospace;letter-spacing:0}.beta{font:9px ui-monospace,monospace;letter-spacing:1px;margin-left:15px;color:var(--muted)}.header-actions{display:flex;gap:10px}main{max-width:1480px;margin:auto;padding:32px 4vw 24px}.setup-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:64px}.intro{position:relative;min-height:590px;display:flex;flex-direction:column}.intro>.eyebrow{color:#a56647;margin:8px 0 24px}h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(48px,5.6vw,82px);font-weight:500;letter-spacing:-4px;line-height:.99;margin-bottom:22px}.intro h1 span{display:block;color:var(--coral);font-style:italic}.lead{font-size:14px;max-width:390px;color:#6f786d;margin-bottom:0}#hero{display:block;width:100%;height:185px;margin:auto 0 0}.intro-foot{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:17px;font:10px ui-monospace,monospace;letter-spacing:1.5px}.setup-panel{padding:30px 32px;border:1px solid var(--line);border-radius:18px;background:var(--cream)}.setup-panel>.eyebrow{color:var(--coral);margin-bottom:16px}.setup-panel h2{font-family:Georgia,serif;font-weight:500;font-size:31px;max-width:340px;line-height:1.15;margin-bottom:25px}.field-label{display:block;font-size:12px;font-weight:650;margin:19px 0 10px}.choice{display:flex;gap:8px}.choice button{flex:1;font-size:18px;padding:9px}.choice .selected{background:var(--ink);border-color:var(--ink);color:white}.names{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}.names label{font-size:10px;color:var(--muted)}.names input{display:block;width:100%;padding:10px;border:1px solid var(--line);border-radius:6px;background:white;margin-top:5px;font-size:13px}.level-options{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:22px}.level-option{text-align:left;padding:10px;font-size:11px;min-height:67px}.level-option small{display:block;font:10px ui-monospace,monospace;color:var(--muted);margin-bottom:7px}.level-option.selected{border-color:var(--coral);background:#fff0e5;box-shadow:inset 0 0 0 1px var(--coral)}.setup-panel>p:last-child{margin:12px 0 0;font-size:11px}.how-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin-top:35px;padding-top:24px;border-top:1px solid var(--line)}.how-strip b{font:600 10px ui-monospace,monospace;letter-spacing:1px;color:#a66b4e}.how-strip p{font-size:12px;margin:9px 0 0;color:var(--muted)}footer{display:flex;justify-content:space-between;gap:15px;margin:10px 4vw 0;padding:20px 0;border-top:1px solid var(--line);font:9px ui-monospace,monospace;letter-spacing:1px;color:var(--muted)}.game-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.game-heading h2{margin:8px 0 14px;font-family:Georgia,serif;font-size:32px;font-weight:500}.scoreboard{display:flex;gap:35px}.scoreboard>div{min-width:75px}.scoreboard span{display:block;font:9px ui-monospace,monospace;letter-spacing:1px;color:var(--muted);margin-bottom:4px}.scoreboard strong{font:500 34px ui-monospace,monospace}.scoreboard strong span{display:inline;font-size:17px;margin-left:3px}.clock{color:var(--coral)}.time-track{height:3px;background:#e6e5db;margin-bottom:24px}.time-track>div{height:100%;width:100%;background:var(--coral);transition:width .1s linear}.play-layout{display:grid;grid-template-columns:minmax(300px,.9fr) minmax(550px,1.7fr);gap:22px}.card-panel,.board-panel{border:1px solid var(--line);border-radius:14px;background:var(--cream);min-width:0}.panel-heading{padding:18px 20px;display:flex;justify-content:space-between;align-items:center;gap:10px;border-bottom:1px solid var(--line)}.tray{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px;padding:19px 15px;align-content:start;min-height:435px;max-height:550px;overflow-y:auto;background:#f0f1e7}.tile{--tile:#e1ebce;background:var(--tile);border:1px solid #b9c6b58a;border-radius:4px;color:#344c3f;position:relative;padding:0;aspect-ratio:1.07;min-width:0;touch-action:none;display:flex;flex-direction:column;align-items:center;justify-content:center;user-select:none}.tile:hover:not(:disabled){background:var(--tile);filter:brightness(1.04)}.tile b{font-size:clamp(17px,1.6vw,24px);font-weight:550;pointer-events:none}.tile .z{position:absolute;left:5px;top:3px;font:8px ui-monospace,monospace;pointer-events:none}.tile .zh{font-size:9px;margin-top:2px;pointer-events:none}.tile.named b{font-size:clamp(8px,.75vw,11px);letter-spacing:-.4px}.tile.named .zh{font-size:10px}.tile.selected{outline:3px solid var(--coral);outline-offset:1px;z-index:1}.tray .tile:nth-child(4n+1){transform:rotate(-4deg)}.tray .tile:nth-child(4n+3){transform:rotate(3deg)}.tray-note{font-size:11px;padding:12px 16px;margin:0;color:var(--muted);border-top:1px solid var(--line)}.board-scroll{padding:20px;overflow-x:auto;background:#f8f8ef}.board{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:4px;min-width:480px}.slot{padding:0;border:1px solid #dfe3d7;background:#eeefe2;border-radius:4px;aspect-ratio:1.12;min-width:0;position:relative}.slot:hover:not(:disabled){background:#e3e8d5;transform:none}.slot .tile{width:100%;height:100%;aspect-ratio:auto;border:none}.slot:has(.tile){border-color:transparent}.slot.invalid{outline:2px solid var(--coral)}.board-actions{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:15px 18px 7px}#feedback{min-height:45px;padding:7px 22px 10px;font-size:12px;color:#61764d;line-height:1.5}#feedback.error{color:#bd4c34}.reward-strip{border-top:1px solid var(--line);background:#f0f2e6;padding:14px 20px;display:flex;flex-wrap:wrap;gap:14px;font-size:11px;border-radius:0 0 14px 14px}.reward-strip b{color:#b56542}.reward-strip i{font-style:normal}.reward-strip span:last-child{color:var(--muted);margin-left:auto;font-size:10px}.game-foot{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);padding-top:12px}.result-heading{text-align:center;margin:10px 0 25px}.result-heading h1{font-size:57px;margin:14px 0}.result-heading p{font-size:13px}.standings{display:flex;gap:12px;justify-content:center;margin-bottom:24px}.standing{flex:1;max-width:310px;text-align:left;background:var(--cream);padding:18px;border-radius:12px}.standing.active{border-color:var(--coral);box-shadow:inset 0 0 0 1px var(--coral)}.standing span{display:block;font-size:12px;overflow-wrap:anywhere}.standing strong{display:block;font:500 29px ui-monospace,monospace;margin:10px 0}.standing small{font-size:10px;color:var(--muted)}.mosaic-panel{background:var(--cream);border:1px solid var(--line);border-radius:16px;max-width:1100px;margin:auto}.mosaic-panel canvas{display:block;width:100%;aspect-ratio:1100/540}.mosaic-panel>p{text-align:center;margin:0 10px 18px}.result-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:24px 0 12px}#save-status{text-align:center}.drag-ghost{position:fixed;pointer-events:none;z-index:30;width:65px;height:62px;opacity:.93;box-shadow:0 12px 18px #28362133;transform:rotate(-4deg)}#effects{position:fixed;inset:0;pointer-events:none;z-index:40;width:100%;height:100%}#float-score{position:fixed;z-index:41;pointer-events:none;color:#d25f3e;font:700 30px ui-monospace,monospace;text-shadow:0 2px 0 #fff;opacity:0}#float-score.show{animation:score-pop 1.3s ease-out forwards}@keyframes score-pop{0%{opacity:0;transform:translateY(0) scale(.7)}20%{opacity:1;transform:translateY(-20px) scale(1.1)}70%{opacity:1}100%{opacity:0;transform:translateY(-80px) scale(1)}}dialog{border:1px solid var(--line);border-radius:19px;padding:34px;max-width:480px;width:calc(100% - 36px);color:var(--ink);background:var(--cream);box-shadow:0 30px 120px #253f3933}dialog::backdrop{background:#22342d66;backdrop-filter:blur(5px)}dialog h2{font-family:Georgia,serif;font-weight:500;font-size:36px;margin:15px 0}dialog p{font-size:14px;color:var(--muted)}.ready-rule{padding:18px;background:#eef1e4;font-size:13px;line-height:1.7;border-radius:10px;margin:20px 0}#help-copy p{font-size:13px}#help-copy b{color:var(--ink)}
@media(min-width:1500px){.board{gap:5px}.board-scroll{padding:25px}.tray{gap:9px}.tile b{font-size:25px}}@media(max-width:1000px){.setup-grid{gap:30px}.play-layout{grid-template-columns:280px minmax(0,1fr);gap:14px}.tray{grid-template-columns:repeat(5,minmax(0,1fr));max-height:530px}.board-scroll{padding:12px}.board-actions{flex-wrap:wrap}.reward-strip{gap:10px}.scoreboard{gap:20px}.beta{display:none}.tile.named b{font-size:8px}}@media(max-width:700px){header{height:70px;padding:0 18px}.brand{font-size:19px}.brand-icon{width:34px;height:38px;font-size:21px}.header-actions{gap:0}.header-actions button{font-size:10px;padding:9px 6px}main{padding:22px 18px}.setup-grid{grid-template-columns:1fr;gap:27px}.intro{min-height:460px}.intro h1{font-size:63px}.intro>.eyebrow{font-size:9px}.intro #hero{height:160px}.setup-panel{padding:25px}.how-strip{gap:15px}.how-strip p{font-size:11px}.how-strip b{font-size:9px}.game-heading{align-items:flex-start}.game-heading h2{font-size:23px}.game-heading .eyebrow{font-size:8px;letter-spacing:1px}.scoreboard{gap:12px}.scoreboard>div{min-width:40px}.scoreboard strong{font-size:24px}.scoreboard span{font-size:7px;letter-spacing:0}.play-layout{display:flex;flex-direction:column-reverse}.tray{grid-template-columns:repeat(8,minmax(0,1fr));min-height:0;max-height:300px;padding:15px 12px;gap:7px}.tile b{font-size:18px}.tile.named b{font-size:8px}.tile .z{font-size:7px;left:3px}.panel-heading{padding:13px}.panel-heading h3{font-size:14px}.panel-heading .small{font-size:10px}.board-actions{padding:12px 10px 5px;flex-wrap:nowrap}.board-actions button{padding:10px;font-size:11px}.board-actions #placed{font-size:9px}.reward-strip{font-size:10px;padding:10px 12px}.reward-strip span:last-child{display:none}#feedback{padding:8px 14px;min-height:44px;font-size:11px}.result-heading h1{font-size:42px;letter-spacing:-2px}.standings{flex-wrap:wrap;gap:8px}.standing{min-width:40%;padding:13px}.standing strong{font-size:25px}.mosaic-panel{overflow-x:auto}.mosaic-panel canvas{min-width:620px}.mosaic-panel>p{font-size:10px}.mosaic-panel .panel-heading{min-width:350px}.result-actions button{font-size:12px}footer{font-size:7px;letter-spacing:0}footer span:nth-child(2){display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.show{animation-duration:.3s!important}}
/* Keep time visible and the work surface within a classroom laptop screen. */
.game-heading{position:sticky;top:0;z-index:5;background:var(--paper);padding:8px 0}
.board{grid-template-rows:repeat(7,clamp(35px,calc((100dvh - 355px)/7),57px))}.slot{aspect-ratio:auto}
.tray{height:clamp(310px,calc(100dvh - 320px),490px);min-height:0;max-height:none}
.name-mode .tray{grid-template-columns:repeat(4,minmax(0,1fr))}.name-mode .tray .tile b{font-size:11px;letter-spacing:-.45px}
@media(max-width:700px){.board{grid-template-rows:repeat(7,39px)}.tray{height:270px;grid-template-columns:repeat(6,minmax(0,1fr))}.name-mode .tray{grid-template-columns:repeat(4,minmax(0,1fr))}.mosaic-panel canvas{min-width:0}.mosaic-panel .panel-heading{min-width:0;flex-wrap:wrap}.mosaic-panel h3{font-size:12px}.mosaic-panel .pill{font-size:9px}.brand{white-space:nowrap}.scoreboard strong{font-size:21px}.game-heading h2{font-size:20px}.game-heading .eyebrow{max-width:150px}.scoreboard{gap:9px}}
@media(max-width:400px){.brand{font-size:15px;gap:6px}.brand-icon{width:30px;height:34px;font-size:19px}.header-actions button{font-size:9px;padding:8px 4px}.header-actions{gap:0}.game-heading{gap:7px}.scoreboard strong{font-size:18px}.scoreboard>div{min-width:32px}.game-heading h2{font-size:18px}.name-mode .tray .tile b{font-size:9px}}
@media(min-width:701px){.board{grid-template-rows:repeat(7,clamp(30px,calc((100dvh - 470px)/7),52px))}.tray{height:clamp(290px,calc(100dvh - 360px),480px)}.name-mode .tray .tile{aspect-ratio:1.85}}
#save-status a{color:var(--coral);font-weight:650}
.trophy-panel{max-width:900px;margin:0 auto 24px;padding:10px 30px 18px;display:flex;align-items:center;justify-content:center;gap:30px;border:1px solid #dfc789;border-radius:18px;background:radial-gradient(ellipse at 25% 45%,#fff3bc,#faf5e5 60%);overflow:hidden}.trophy-panel canvas{width:230px;height:auto;flex:none;transform-origin:50% 93%;animation:mendeleev-dance 1.1s ease-in-out infinite}.trophy-panel h2{font:500 32px Georgia,serif;color:#956322;margin:12px 0}.trophy-panel .eyebrow{color:#a37730}.trophy-panel p{font-size:14px;margin-bottom:10px}.trophy-quote{font-style:italic;color:#9b793b;max-width:390px}@keyframes mendeleev-dance{0%,100%{transform:rotate(-7deg) translateY(0) scaleX(1.02)}25%{transform:rotate(1deg) translateY(-13px) scaleX(.98)}50%{transform:rotate(7deg) translateY(0) scaleX(1.02)}75%{transform:rotate(-1deg) translateY(-8px) scaleX(.98)}}@media(max-width:700px){.trophy-panel{flex-direction:column;gap:0;text-align:center;padding:15px 20px 20px}.trophy-panel canvas{width:195px}.trophy-panel h2{font-size:27px}.trophy-panel p{font-size:12px}}@media(prefers-reduced-motion:reduce){.trophy-panel canvas{animation:none}}