:root{color-scheme:light;font-family:"BIZ UDPGothic","Yu Gothic",Meiryo,sans-serif;color:#482d17;background:#e5c396}*{box-sizing:border-box}body{margin:0}html{scrollbar-gutter:stable}button,a{touch-action:manipulation}button{font:inherit;font-weight:700;cursor:pointer;color:#482d17;border:1px solid #aa8148;border-radius:14px;background:#fff7df;min-height:44px;padding:10px 16px}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible{outline:3px solid #0e6ba8;outline-offset:3px}[hidden]{display:none!important}#workshop{min-height:calc(100svh - var(--dm-common-header-height,58px));background:#ccb58c url('./images/background-game.webp') center/cover fixed;padding:16px 16px 150px}#workshop.title-view{background-image:url('./images/background-title.webp');padding-bottom:28px}#screen{max-width:1200px;margin:auto}.wood-button{background:transparent url('./images/ui-button-cream.webp') center/100% 100% no-repeat;border:0;min-width:150px;padding:17px 35px;border-radius:30px}.wood-button.green{background-image:url('./images/ui-button-green.webp');color:#fffcec;text-shadow:0 1px #163d17}.title-content{text-align:center;max-width:840px;margin:auto}.title-logo{width:min(90%,550px);display:block;margin:0 auto}.title-description{display:inline-block;background:#fff6dfeb;border-radius:20px;padding:12px 24px;font-weight:700;line-height:1.6;margin:10px 0}.title-scene{height:330px;display:flex;align-items:flex-end;justify-content:center;gap:15px;margin:0 auto 8px}.title-scene .clock{width:210px}.title-scene .character{width:190px;max-height:280px;object-fit:contain}.title-actions{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}.title-actions .green{font-size:26px;min-width:290px}.title-note{display:block;max-width:650px;margin:16px auto 0;background:#fff8e6ed;border-radius:16px;padding:12px;font-size:14px;line-height:1.65}.topline{display:grid;grid-template-columns:165px minmax(0,1fr) max-content;align-items:center;gap:12px}.small-logo{width:100%}.question-plaque{background:#fff0d6 url('./images/ui-header-plaque.webp') center/100% 100% no-repeat;text-align:center;border-radius:24px;padding:21px 52px;min-height:74px;margin:0;font-size:clamp(18px,2.2vw,28px);line-height:1.4}.progress{min-width:82px;font-variant-numeric:tabular-nums;background:#fff7dce8;border:2px solid #b0864e;border-radius:18px;padding:14px 8px;text-align:center;white-space:nowrap}.progress b{font-size:26px;color:#355b33}.experiment-instruction{text-align:center;font-size:16px;line-height:1.5;background:#fff7e6ef;border-radius:14px;padding:9px 16px;margin:9px auto;max-width:840px}.stage{display:grid;grid-template-columns:100px minmax(0,760px) 100px;gap:8px;justify-content:center;align-items:end}.stage>.character{width:100%;max-height:180px;object-fit:contain;object-position:bottom}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:12px}.clock-panel{min-width:0;text-align:center;background:url('./images/ui-comparison-panel.webp') center/100% 100% no-repeat;padding:15px 26px 27px;position:relative}.clock-panel h2{color:#fff9e6;text-shadow:0 1px #573414;font-size:19px;margin:0 0 12px;line-height:1.8}.clock{position:relative;width:min(100%,235px);margin:auto;aspect-ratio:2/3;flex-shrink:0}.clock svg{display:block;width:100%;height:100%;overflow:visible}.dial text{font-family:Georgia,serif;font-size:61px;fill:#603a20;text-anchor:middle;dominant-baseline:middle;font-weight:bold}.bob-handle{position:absolute;transform:translate(-50%,-50%);width:48px;height:48px;min-height:48px;padding:0;border:2px solid transparent;background:transparent;touch-action:none;cursor:ns-resize;border-radius:50%}.bob-handle:hover{border-color:#ffffffa0}.bob-handle:disabled{opacity:1}.conditions{min-height:54px;display:flex;justify-content:center;gap:3px 12px;flex-wrap:wrap;font-size:14px;line-height:1.4;margin-top:4px}.conditions span{white-space:nowrap}.conditions span:first-child{flex-basis:100%;font-size:17px}.lamps{display:flex;justify-content:center;gap:18px;margin:6px 0 0}.lamp{font-size:15px;font-weight:bold;display:flex;align-items:center;gap:5px}.lamp:before{content:"";width:20px;height:20px;border:3px solid #98713d;border-radius:50%;background:#9b8764;box-shadow:inset 0 2px 5px #59401b}.lamp.lit:before{background:#ffef80;box-shadow:0 0 12px #fcbf31,inset 0 0 3px white}.controls{max-width:790px;margin:12px auto 0;background:#fff7e9f2;border:2px solid #b38750;border-radius:18px;padding:12px;text-align:center}.controls p{margin:0 0 9px;line-height:1.5}.adjust,.choices{display:flex;gap:8px;justify-content:center}.adjust button{min-width:130px}.choices button{flex:1;min-width:0}.choices button[aria-pressed="true"]{background:#e0eac7;border:3px solid #4e733d}.choices .candidate{display:flex;flex-direction:column;text-align:left;gap:3px;font-size:14px}.candidate strong{color:#355e31}.observation{min-height:1.8em;margin:8px 0 0!important;color:#395a32}.dock{position:fixed;bottom:0;left:0;right:0;z-index:20;background:#fff7e9f5;border-top:3px solid #b18750;padding:8px max(12px,env(safe-area-inset-right)) calc(8px + env(safe-area-inset-bottom));box-shadow:0 -3px 15px #4c2b1920}.dock-inner{max-width:1050px;margin:auto;display:flex;align-items:center;justify-content:center;gap:8px}.tools{display:flex;gap:6px;flex-wrap:wrap}.tools button{font-size:13px;padding:8px 12px}.feedback{flex:1;text-align:center;max-width:340px;line-height:1.4}.feedback strong{font-size:23px;color:#396135;display:block}.feedback small{display:block;font-size:13px}.dock .next{min-width:152px}.result{max-width:680px;text-align:center;margin:auto;background:#fff7e8ed;border:2px solid #b68b48;border-radius:25px;padding:25px}.result h1{font-size:34px;color:#355b32}.result .characters{display:flex;align-items:flex-end;justify-content:center;gap:28px;height:220px}.result img{max-height:100%;width:150px;object-fit:contain}.result p{line-height:1.8}.result-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.result .dm-game-feedback{margin-top:22px}#save-status{background:#fff8e7;padding:12px;border-radius:10px;max-width:700px;margin:10px auto}#retry-save{display:block;margin:auto}dialog{border:2px solid #a47b42;border-radius:20px;background:#fff8e7;color:#482d17;width:min(600px,calc(100% - 24px));max-height:calc(100svh - 30px);padding:20px;line-height:1.8}dialog::backdrop{background:#261c16a6}.help-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.help-top h2{margin:0}dialog p{margin:12px 0}.trip-diagram{background:#f0e5c9;border-radius:14px;padding:12px;display:flex;justify-content:center;gap:16px;align-items:center}.trip-diagram span{display:block;text-align:center}.trip-diagram b{font-size:25px;color:#355b32}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(min-width:1000px) and (min-height:820px){.clock{width:270px}.clock-panel{padding-top:22px}.clock-panel h2{margin-bottom:18px}.stage>.character{max-height:220px}.title-scene{height:390px}.title-scene .clock{width:250px}.title-scene .character{width:210px;max-height:320px}}
@media(max-width:760px){#workshop{padding:10px 10px 160px;background-attachment:scroll}.topline{grid-template-columns:90px minmax(0,1fr) max-content;gap:7px}.question-plaque{font-size:17px;padding:16px 25px;min-height:65px}.progress{min-width:64px;padding:8px 4px;font-size:13px}.progress b{font-size:22px}.stage{grid-template-columns:minmax(0,1fr);max-width:560px;margin:auto}.stage>.character{display:none}.clock-panel{padding:13px 18px 20px}.clock-panel h2{font-size:16px;margin-bottom:6px}.clock{width:195px;max-width:100%}.comparison{gap:8px}.dock-inner{flex-wrap:wrap}.tools{order:2;justify-content:center;flex-basis:100%}.tools button{min-height:44px}.feedback{min-width:140px;font-size:14px}.dock .next{min-width:140px;padding:13px 28px}.title-scene{height:290px;gap:0}.title-scene .clock{width:190px}.title-scene .character{width:135px}.title-description{font-size:16px}.controls{padding:10px}.title-logo{max-width:430px}}
@media(max-width:430px){#workshop{padding:8px 8px 175px}.topline{grid-template-columns:66px minmax(0,1fr) max-content;gap:4px}.question-plaque{font-size:15px;padding:12px 17px}.clock-panel{padding:11px 10px 19px}.clock-panel h2{font-size:14px;line-height:1.9;white-space:nowrap}.conditions{font-size:12px;min-height:67px;gap:3px;flex-direction:column}.conditions span:first-child{font-size:15px;flex-basis:auto}.lamps{gap:9px}.lamp{font-size:13px;gap:3px}.lamp:before{width:17px;height:17px}.experiment-instruction{font-size:14px;padding:8px;margin:7px auto}.choices{gap:5px}.choices button{padding:9px 5px;font-size:13px}.choices .candidate{font-size:12px}.adjust button{min-width:115px}.title-scene{height:250px}.title-scene .clock{width:150px}.title-scene .character{width:90px}.title-description{padding:9px 14px;font-size:14px}.title-actions{gap:4px}.title-actions .green{min-width:260px}.title-actions .wood-button{padding-top:13px;padding-bottom:13px}.result{padding:20px 12px}.result h1{font-size:27px}.result .characters{height:165px}.result img{width:120px}.dock .tools{gap:4px}.tools button{padding:8px;font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
.dock .controls{margin:0 auto 6px;padding:0;border:0;background:transparent}.dock .observation{font-size:14px;margin:3px 0 0!important;min-height:1.5em}#workshop:not(.title-view){padding-bottom:230px}
@media(min-width:761px) and (max-height:800px){.question-plaque{min-height:56px;padding:12px 52px}.topline{grid-template-columns:140px minmax(0,1fr) max-content}.clock{width:150px}.clock-panel{padding:10px 20px 18px}.clock-panel h2{line-height:1.5;margin-bottom:6px}.conditions{min-height:45px}.title-logo{max-width:430px}.title-scene{height:225px}.title-scene .clock{width:164px}.title-scene .character{width:155px;max-height:225px}.title-note{font-size:13px;margin-top:8px}.title-description{padding:8px 20px}.title-actions .wood-button{padding-top:13px;padding-bottom:13px}}
@media(min-width:761px){.stage{grid-template-columns:140px minmax(0,760px) 140px}.stage .clock{width:clamp(130px,calc((100svh - 550px)*.66667),240px);max-width:100%}}
@media(min-width:761px) and (max-width:999px){.stage{grid-template-columns:90px minmax(0,1fr) 90px}}
@media(max-width:430px){.stage .clock{width:clamp(94px,calc((100svh - 515px)*.56),135px);max-width:100%}.dock .tools{gap:3px;flex-wrap:nowrap}.tools button{padding:8px 4px;min-width:44px}.feedback{min-width:110px}.dock .next{min-width:130px}.dock .feedback strong{font-size:20px}.dock .feedback small{font-size:12px}}

/* Put the rhythm lamps near the panel heading, clear of the bottom controls. */
.clock-panel{display:flex;flex-direction:column;align-items:stretch}
.clock-panel h2{order:-2}
.clock-panel .lamps{order:-1;margin:0 0 6px;gap:8px}
.lamp{border:1px solid #b9a174;border-radius:8px;padding:3px;background:#fff8e4;color:#482d17;line-height:1.25;white-space:nowrap}
.lamp:before{flex-shrink:0}
.lamp.lit{background:#ffe58a;border-color:#8b590b;box-shadow:inset 0 0 0 1px #8b590b}
.lamp.lit:before{background:#fff38a;border-color:#825210;box-shadow:0 0 7px #fcbf31,inset 0 0 3px white}
#workshop:has(.stage){padding-bottom:calc(var(--play-dock-height,230px) + 12px)}
.stage .clock{width:min(240px,var(--play-clock-width,135px));margin:0 auto}
@media(max-width:760px){.stage .clock{width:min(195px,var(--play-clock-width,135px))}}
@media(max-width:430px){.stage .clock{width:min(135px,var(--play-clock-width,94px))}.stage .conditions{min-height:0}}
@media(max-width:430px) and (max-height:720px){
 #workshop:has(.stage){padding-top:5px}
 #screen:has(.stage) .topline{grid-template-columns:50px minmax(0,1fr) max-content}
 #screen:has(.stage) .question-plaque{min-height:48px;padding:8px 14px;font-size:14px}
 #screen:has(.stage) .progress{min-width:58px;padding:7px 3px}
 #screen:has(.stage) .experiment-instruction{font-size:13px;line-height:1.4;padding:6px;margin:5px auto}
 .stage .clock-panel{padding:8px 8px 12px}
 .stage .clock-panel h2{font-size:13px;line-height:1.6;margin-bottom:4px}
 .stage .conditions{line-height:1.3;gap:1px}
 .dock:has(.controls){padding:6px 8px calc(6px + env(safe-area-inset-bottom))}
 .dock .choices button{padding:6px 4px}
 .dock .candidate{gap:1px;line-height:1.35}
 .dock .observation{font-size:12px;line-height:1.35;min-height:1.4em}
 .dock .next{padding:8px 26px;min-height:44px}
 .dock .feedback strong{font-size:18px}
 .dock .feedback small{font-size:11px}
}

/* A framed number identifies the length that the player can adjust. */
#workshop.lab-view{padding-bottom:90px}
.lab-view .topline{grid-template-columns:140px 1fr}
.lab-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(280px,1fr);gap:14px;align-items:start}
.lab-panel{padding:12px 20px 20px}
.lab-panel .clock{width:clamp(110px,calc((100svh - 435px)*.55),190px);max-width:100%}
.lab-panel .conditions{flex-direction:column;min-height:0;gap:2px;font-size:14px}
.lab-panel .conditions span:first-child{flex-basis:auto;font-size:15px}
.lab-period{margin:7px 0 0;padding-bottom:16px;font-size:13px;line-height:1.45}
.lab-period strong{font-size:19px;color:#365e31}
.lab-controls{background:#fff8e9f5;border:2px solid #b38750;border-radius:18px;padding:14px}
.lab-controls h2{font-size:17px;margin:0 0 9px;text-align:center}
.lab-control{display:grid;grid-template-columns:50px minmax(0,1fr) 75px;gap:6px;align-items:center;margin:5px 0}
.lab-control label{align-self:center;font-weight:700}
.lab-control output{grid-column:3;grid-row:1;font-weight:700;min-width:0;text-align:center;border:2px solid currentColor;border-radius:7px;padding:1px 7px;background:#fff1cc;color:#864000;font-variant-numeric:tabular-nums}
.lab-control[data-variable="mass"] output{color:#355e31;background:#eef5dd}
.lab-control[data-variable="amplitude"] output{color:#70427f;background:#f7eafd}
.lab-slider{grid-column:2;grid-row:1;display:flex;gap:6px;align-items:center}
.lab-slider button{min-width:44px;padding:6px;line-height:1}
.lab-slider input{min-width:0;flex:1;width:100%;height:44px;margin:0;accent-color:#986123;cursor:pointer;touch-action:pan-y}
.lab-slider input:focus-visible{outline:3px solid #0e6ba8;outline-offset:2px;border-radius:8px}
.lab-change{font-size:13px;line-height:1.5;min-height:3em;margin:8px 0;color:#365e31}
.lab-compare-actions{display:flex;flex-wrap:wrap;gap:6px}
.lab-compare-actions button{flex:1;font-size:13px;padding:8px}
.lab-note,.lab-model-note{font-size:12px;line-height:1.6;margin:10px 0 0}
.lab-model-note{background:#fff8e9ef;padding:9px 14px;border-radius:12px}
.lab-finding{background:#f1f5e4;border:1px solid #668b4a;border-radius:12px;padding:8px 10px;line-height:1.6;margin:8px 0;font-size:14px;font-weight:700;color:#365e31;min-height:4.5em}
.lab-panel[data-side="1"] .conditions span:nth-child(1) b{color:#864000}.lab-panel[data-side="1"] .conditions span:nth-child(2) b{color:#355e31}.lab-panel[data-side="1"] .conditions span:nth-child(3) b{color:#70427f}
.lab-tools{display:flex;justify-content:center;gap:8px}.lab-tools button{font-size:14px;white-space:nowrap}
@media(max-width:760px){.lab-view .topline{grid-template-columns:80px 1fr}.lab-layout{grid-template-columns:1fr;max-width:560px;margin:auto;gap:8px}.lab-panel{padding:10px 14px 16px}.lab-panel h2{font-size:14px;line-height:1.6;margin-bottom:4px}.lab-panel .clock{width:105px}.lab-panel .conditions{font-size:12px;gap:0}.lab-panel .conditions span:first-child{font-size:13px}.lab-period{margin:3px 0 0;font-size:12px;line-height:1.3}.lab-period strong{font-size:16px}.lab-panel .lamps{margin-top:4px}.lab-controls{padding:8px 12px}.lab-controls h2{font-size:15px;margin-bottom:3px}.lab-control{grid-template-columns:65px minmax(0,1fr) 72px;gap:6px;align-items:center;margin:0}.lab-control label{font-size:13px}.lab-control output{grid-column:3;grid-row:1;min-width:0;font-size:14px;padding:1px 4px}.lab-slider{grid-column:2;grid-row:1;gap:3px}.lab-slider button{min-width:32px;width:32px;font-size:16px}.lab-change{min-height:1.5em;font-size:12px;margin:5px 0}.lab-note{margin-top:7px}.lab-tools{gap:4px}.lab-tools button{padding:8px 9px;font-size:12px}}
@media(max-width:760px){html:has(.lab-view){scroll-padding-top:350px;scroll-padding-bottom:76px}.lab-layout .comparison{position:sticky;top:0;z-index:2;background:#ead0a6;border-radius:16px}}
@media(max-width:360px){.lab-view .topline{grid-template-columns:66px 1fr}.lab-panel{padding-left:10px;padding-right:10px}.lab-panel h2{font-size:13px}.lab-control{grid-template-columns:52px minmax(0,1fr) 62px;gap:4px}.lab-slider button{min-width:28px;width:28px}.lab-slider{gap:2px}.lab-panel .clock{width:94px}.lab-tools button{padding:8px 5px}}

.conditions .adjustable-length{color:#864000;font-weight:700}
.conditions .adjustable-length b{display:inline-block;min-width:2.3em;padding:1px 7px;border:2px solid #aa5a13;border-radius:7px;background:#fff1cc;color:#864000;font-size:1.2em;line-height:1.1;font-variant-numeric:tabular-nums;vertical-align:middle}

/* Keep the feet and the clock base on one responsive tabletop. */
.title-scene{position:relative;isolation:isolate;width:min(100%,720px);gap:clamp(6px,3vw,32px);margin-bottom:40px}
.title-figure{position:relative;display:flex;align-items:flex-end;justify-content:center;min-width:0;z-index:1}
.title-figure .character{display:block;max-width:100%}
.title-figure.rabbit-curious{transform:scale(.85);transform-origin:center bottom}
.title-figure::before{content:"";position:absolute;bottom:-5px;left:15%;width:70%;height:12px;border-radius:50%;background:radial-gradient(ellipse,#46251280 0%,#46251230 45%,transparent 72%);z-index:-1}
.title-scene .clock{margin:0;transform:translateY(4.583333%)}
.title-workbench{position:absolute;top:calc(100% - 7px);left:0;right:0;height:144px;pointer-events:none;z-index:-2;filter:drop-shadow(0 8px 5px #3d210c30)}
.bench-top{position:absolute;inset:0 0 auto;height:29px;clip-path:polygon(3% 0,97% 0,100% 100%,0 100%);background:repeating-linear-gradient(176deg,transparent 0 6px,#fff1c229 7px 8px,transparent 9px 12px,#6c35141a 13px 14px),linear-gradient(#efc185,#cc8a46);border-top:2px solid #ffe0a5}
.bench-edge{position:absolute;top:27px;left:0;right:0;height:24px;border:1px solid #9a592b;border-radius:2px 2px 9px 9px;background:repeating-linear-gradient(2deg,transparent 0 8px,#58250826 9px,transparent 10px 12px),linear-gradient(#ce8d48,#a6602e);box-shadow:inset 0 3px 2px #ffdc9270,inset 0 -3px 2px #65331555}
.bench-leg{position:absolute;top:43px;bottom:0;width:25px;border:1px solid #8d5129;border-radius:0 0 4px 4px;background:repeating-linear-gradient(88deg,transparent 0 5px,#5f321a25 6px,transparent 7px 9px),linear-gradient(90deg,#ad7239,#dba360 35%,#98612f);box-shadow:inset -4px 0 #6d3c2129}
.bench-leg.left{left:5%}.bench-leg.right{right:5%}
.title-actions,.title-note,.title-sound-guide{position:relative;z-index:2}
.title-sound-guide{display:flex;align-items:center;justify-content:center;gap:16px;max-width:650px;margin:0 auto 10px;padding:9px 18px;background:#fff0b9;border:2px solid #a97025;border-radius:18px;box-shadow:0 3px 0 #71491835}
.title-sound-icon{font-size:38px;line-height:1;color:#875213}
.title-sound-guide .title-sound-tip{margin:0;text-align:left;font-size:18px;font-weight:700;line-height:1.5;color:#4f361c}
.title-sound-tip span{display:block;word-break:keep-all;overflow-wrap:anywhere}
.title-sound-guide button{flex-shrink:0;border:2px solid #987035;background:#fffdf2;font-size:16px;white-space:nowrap}
@media(max-width:430px){.title-sound-guide{gap:8px;padding:10px}.title-sound-icon{display:none}.title-sound-guide .title-sound-tip{font-size:16px}.title-sound-guide button{padding:10px 8px;font-size:14px}}
@media(max-width:430px){.title-scene{gap:4px}.title-scene .clock{width:40%;max-width:150px}.title-figure{flex:1}.title-workbench{height:160px}.bench-leg{width:18px}.title-figure::before{height:9px}}