:root{color-scheme:light;--blue:#084cff;--ink:#101113;--muted:#606773;--stage:#eff4fa;--line:#d6d9df;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;padding:0 4.35%;min-width:320px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:disabled{cursor:wait}button:focus-visible,a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}button{touch-action:manipulation}[hidden]{display:none!important}.topbar,main,footer{max-width:1320px;margin-inline:auto}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #85898f}.brand{font-size:25px;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-1px}.quiet{border:0;background:none;padding:12px 0;font-size:15px;color:var(--ink)}.quiet:hover{color:var(--blue)}.intro{padding:50px 0 35px}.intro h1{font-size:clamp(44px,6.1vw,86px);font-weight:900;letter-spacing:-.055em;line-height:1.15;margin:0 0 14px}.intro p{font-size:clamp(18px,2vw,27px);line-height:1.6;margin:0;letter-spacing:.025em}.tabs{display:flex;gap:58px;border-bottom:1px solid var(--line);margin-bottom:22px}.tabs button{border:0;border-bottom:4px solid transparent;background:none;padding:16px 10px 18px;font-size:18px;color:var(--muted);white-space:nowrap}.tabs button[aria-selected=true]{border-bottom-color:var(--blue);color:var(--blue);font-weight:700}.tabs button:hover{color:var(--blue)}.tabs span{font-variant-numeric:tabular-nums;margin-right:5px}.experiment{position:relative;min-height:500px;display:grid;grid-template-columns:62% 38%;align-items:center;background:var(--stage);border-radius:24px;overflow:hidden}.experiment-label{position:absolute;top:26px;left:32px;margin:0;font-size:14px;z-index:3;pointer-events:none}.visual{height:500px;position:relative;min-width:0;isolation:isolate}.instructions{position:relative;padding:30px 42px 22px 10px;z-index:4}.instructions h2{font-size:clamp(30px,3.2vw,45px);letter-spacing:-.04em;line-height:1.3;margin:0 0 18px;font-weight:800}.description{font-size:19px;line-height:1.8;margin:0 0 34px;min-height:68px}.actions{min-height:54px;position:relative}.primary{border:0;border-radius:40px;padding:15px 26px;color:white;background:var(--blue);font-size:18px;font-weight:700;min-height:54px;transition:background .2s,transform .2s}.actions .primary{width:min(100%,266px)}.primary:hover{background:#003ddd;transform:translateY(-2px)}.primary:active{transform:translateY(1px)}.primary:disabled{opacity:.72;transform:none}.reset{display:block;border:0;background:none;color:var(--muted);font-size:13px;padding:10px 0;position:absolute;top:56px}.reset:hover{color:var(--blue)}.feedback{font-size:15px;line-height:1.8;color:#4c535e;margin:35px 0 0;min-height:54px;max-width:320px}.object{background-image:url('./assets/objects.png');background-size:300% 200%;background-repeat:no-repeat;width:100%;height:100%;mix-blend-mode:multiply}.person{background-image:url('./assets/people.png');background-size:200% 100%;background-repeat:no-repeat;aspect-ratio:1/2}.blue{background-position:0 0}.orange{background-position:100% 0}.elevator-scene{position:absolute;width:450px;height:450px;left:50%;top:50%;transform:translate(-50%,-46%);perspective:1000px}.elevator-body{position:absolute;inset:0;transform-style:preserve-3d;transition:transform 1.35s cubic-bezier(.65,0,.2,1)}.elevator-front,.elevator-back{position:absolute;inset:0;backface-visibility:hidden}.elevator-front{background-position:0 0}.elevator-back{background-position:100% 100%;transform:rotateY(180deg)}.elevator-body.turned{transform:rotateY(180deg)}.elevator-person{position:absolute;width:103px;height:206px;left:calc(50% - 51px);bottom:66px;z-index:2;filter:drop-shadow(0 6px 3px #0002)}.speech{position:absolute;right:15px;top:137px;background:white;border-radius:15px 15px 15px 0;padding:13px 18px;font-size:16px;box-shadow:0 8px 30px #23345c0b;z-index:4;animation:appear .3s ease both}.restaurant-scene{position:absolute;inset:75px 35px 38px}.tables{display:grid;grid-template-columns:repeat(3,1fr);gap:27px 0;height:100%;padding-bottom:35px}.table{position:relative;min-width:0;border:1px solid transparent;background:none;border-radius:16px;padding:0;transition:background .2s,border-color .2s}.table:hover{background:#fff8}.table[aria-pressed=true]{border-color:#084cff45;background:#ffffff55}.table-art{position:absolute;inset:0;background-position:100% 0;aspect-ratio:1;margin:auto;height:auto}.table-number{position:absolute;bottom:0;left:50%;transform:translateX(-50%);font-size:11px;color:#6a7485}.diner,.follower{position:absolute;width:44px;height:88px;z-index:3;pointer-events:none;transition:left .65s ease,top .65s ease}.diner{left:var(--diner-x,10%);top:var(--diner-y,8%)}.follower{left:var(--follower-x,70%);top:var(--follower-y,60%)}.restaurant-caption{position:absolute;bottom:-12px;left:0;right:0;text-align:center;font-size:13px;color:var(--muted)}.tea-scene{position:absolute;width:420px;height:420px;left:50%;top:50%;transform:translate(-50%,-45%)}.tea-rotator{position:absolute;inset:0;transition:transform 1.3s cubic-bezier(.65,0,.2,1)}.tea-cup{background-position:0 100%}.tea-rotator.upside-down{transform:rotate(180deg)}.straw{position:absolute;width:13px;height:124px;background:#084cff;border:2px solid #0036c7;border-radius:3px;left:50%;top:65%;transform:rotate(-19deg);transform-origin:top;z-index:3;box-shadow:inset 3px 0 #ffffff4d}.straw:after{content:"";position:absolute;bottom:-3px;left:-1px;width:12px;height:6px;border-radius:50%;background:#092c78}.tea-speech{top:105px;right:0}.sip{position:absolute;inset:0;border:3px solid #084cff20;border-radius:50%;animation:sip .65s ease-out both}.tea-scene.empty .tea-cup{opacity:.32;transition:opacity .5s}.tea-scene.empty .straw{opacity:.45}footer{margin-top:42px;padding:18px 0 24px;border-top:1px solid #85898f;display:flex;justify-content:space-between;gap:20px;font-size:13px;color:#42474f}dialog{border:1px solid var(--line);border-radius:24px;padding:48px;max-width:560px;width:calc(100% - 32px);box-shadow:0 30px 100px #13203933;color:var(--ink)}dialog::backdrop{background:#17213b44;backdrop-filter:blur(7px)}.dialog-close{position:absolute;right:28px;top:16px}.dialog-index{font-size:14px;color:var(--blue);margin:0 0 25px}dialog h2{font-size:30px;line-height:1.45;letter-spacing:-.03em;margin:0 0 24px}dialog p{font-size:16px;line-height:1.8}dialog .small{font-size:13px;color:var(--muted);margin:25px 0}.noscript{padding:20px;color:#b41b1b}@keyframes appear{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes sip{from{opacity:1;transform:scale(.5)}to{opacity:0;transform:scale(1.1)}}
@media(min-width:1500px){.intro{padding-top:58px;padding-bottom:42px}.experiment,.visual{min-height:540px}.elevator-scene{width:480px;height:480px}.elevator-person{bottom:74px}}
@media(max-width:1000px){.experiment{grid-template-columns:56% 44%}.visual{height:450px}.experiment{min-height:450px}.instructions{padding-right:25px}.elevator-scene{width:380px;height:380px}.elevator-person{width:90px;height:180px;bottom:55px;left:calc(50% - 45px)}.description{font-size:17px}.restaurant-scene{inset:85px 15px 45px}.diner,.follower{width:34px;height:68px}.tea-scene{width:340px;height:340px}.speech{right:0;top:100px;font-size:14px}.tabs{gap:35px}}
@media(max-width:700px){body{padding:0 22px}.topbar{height:69px}.brand{font-size:21px}.quiet{font-size:13px}.intro{padding:36px 0 23px}.intro h1{font-size:clamp(32px,8.8vw,56px);letter-spacing:-.06em;margin-bottom:12px;white-space:nowrap}.intro p{font-size:15px;line-height:1.8;letter-spacing:0}.tabs{gap:0;justify-content:space-between;margin-bottom:16px}.tabs button{font-size:13px;padding:15px 3px 12px;border-bottom-width:3px}.tabs span{margin-right:2px}.experiment{display:flex;flex-direction:column;min-height:0;border-radius:20px}.experiment-label{top:20px;left:22px;font-size:12px}.visual{width:100%;height:322px;flex-shrink:0}.elevator-scene{width:310px;height:310px;top:53%;transform:translate(-50%,-44%)}.elevator-person{width:74px;height:148px;left:calc(50% - 37px);bottom:46px}.speech{right:8px;top:90px;font-size:12px;padding:10px 12px}.instructions{width:100%;padding:8px 26px 19px;text-align:center}.instructions h2{font-size:29px;margin-bottom:12px}.description{font-size:15px;line-height:1.7;margin-bottom:20px;min-height:51px}.primary{font-size:16px;min-height:50px;padding:13px 24px}.actions .primary{max-width:260px;width:100%}.reset{position:static;margin:2px auto -21px;padding:8px}.feedback{font-size:13px;margin:28px auto 0;min-height:44px;line-height:1.7}.restaurant-scene{inset:66px 12px 31px}.tables{gap:12px 0;padding-bottom:20px}.diner,.follower{width:30px;height:60px}.restaurant-caption{bottom:-7px;font-size:11px}.tea-scene{width:285px;height:285px;top:53%}.straw{height:89px;width:10px}.straw:after{width:9px}.tea-speech{top:75px;right:0}footer{margin-top:28px;padding:18px 0 22px;font-size:10px;gap:8px}dialog{padding:35px 25px}dialog h2{font-size:27px}}
@media(min-width:1001px){.topbar{height:64px}.intro{padding-top:42px;padding-bottom:25px}.experiment,.visual{min-height:520px;height:520px}.elevator-scene{width:520px;height:520px;transform:translate(-50%,-46%)}.elevator-person{width:128px;height:256px;left:calc(50% - 64px);bottom:77px}}
.table-art{height:100%;aspect-ratio:auto;mask-image:radial-gradient(ellipse at center,#000 48%,transparent 74%)}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Experiment 004 — a playable break from serious research. */
.tabs{gap:clamp(12px,3vw,48px)}.game-mode{display:block;min-height:0;height:auto;padding:72px 48px 36px}.block-game{display:grid;grid-template-columns:minmax(200px,280px) minmax(250px,380px);gap:clamp(36px,7vw,110px);justify-content:center;align-items:center}.board-wrap{position:relative;width:100%;border:1px solid #b8c8e0;border-radius:8px;overflow:hidden;background:#fff;box-shadow:0 8px 24px #1b36500a}#block-board{display:block;width:100%;height:auto;touch-action:none}#block-board:focus-visible{outline:3px solid var(--blue);outline-offset:-3px}.board-cover{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:20px;text-align:center;background:#ffffffdc;pointer-events:none}.board-cover strong{font-size:24px}.board-cover span{font-size:13px;line-height:1.8}.game-eyebrow{font-size:12px;color:var(--blue);letter-spacing:.12em;margin:0 0 12px}.game-info h2{font-size:40px;letter-spacing:-.05em;margin:0 0 14px}.game-description{font-size:16px;line-height:1.8;margin:0 0 22px}.game-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;border-block:1px solid #ccd6e4;padding:16px 0}.game-stats div{font-size:11px;color:#596575}.game-stats strong{display:block;font-size:25px;font-variant-numeric:tabular-nums;margin-top:7px;color:var(--ink)}.next-row{display:flex;align-items:center;justify-content:space-between;font-size:13px;height:85px}.next-row canvas{width:100px;height:75px}.game-actions{display:flex;gap:10px}.game-actions .primary{flex:1;font-size:16px}.game-secondary{border:1px solid #b5c1d3;background:white;border-radius:40px;padding:12px 20px}.game-secondary:disabled,.game-controls button:disabled{opacity:.4;cursor:default}.game-message{font-size:13px;line-height:1.8;min-height:46px;margin:16px 0 10px;color:#46546a}.game-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.game-controls button{background:#fff;border:1px solid #c6d2e2;border-radius:10px;min-height:44px;font-size:15px;color:var(--blue);touch-action:manipulation;user-select:none}.game-controls button:active{background:#dae6ff}.game-controls .drop-control{grid-column:1/-1}.game-help{font-size:11px;line-height:1.9;color:#5e6b7e;margin:14px 0 0}.game-help span{font-size:10px}
@media(max-width:700px){.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:0}.tabs button{font-size:11px;padding:14px 0 12px}.tabs span{display:block;margin:0 0 4px;font-size:10px}.game-mode{padding:55px 18px 22px}.block-game{display:flex;flex-direction:column;gap:22px;width:100%}.board-wrap{width:min(100%,240px)}.game-info{width:100%;max-width:360px}.game-info h2{font-size:29px}.game-eyebrow,.game-description{display:none}.game-stats{padding:12px 0}.game-stats strong{font-size:22px}.game-info h2{margin-bottom:14px}.next-row{height:64px}.next-row canvas{height:60px;width:80px}.game-message{min-height:24px}.game-controls{position:relative}.game-actions .primary{min-height:46px}.game-help{font-size:10px}}
.game-play{min-width:0}.game-play .game-controls{margin-top:12px}.game-play .board-wrap{width:100%}#block-board{scroll-margin-top:14px}@media(max-width:700px){.game-play{width:min(100%,220px)}.block-game{gap:25px}.game-play .game-controls{gap:6px}.game-controls button{min-height:40px;font-size:13px}.game-info .game-help{margin-bottom:0}}