:root{--navy:#153962;--cream:#fff9e9;--coral:#d84d3d;--yellow:#f1bc31;--line:#c9c6ac}*{box-sizing:border-box}body{margin:0;font-family:'Zen Maru Gothic','Yu Gothic',sans-serif;background:#f2f2ed;color:var(--navy)}.lab-page{width:min(1280px,calc(100% - 28px));margin:24px auto 45px;padding:0!important;max-width:1280px!important}.sand-app{border:1px solid #c3c9cf;border-radius:20px;background:var(--cream);overflow:hidden;box-shadow:0 15px 40px #19354b18;position:relative;isolation:isolate}.sand-app [hidden]{display:none!important}.sand-app button{font:inherit;cursor:pointer;touch-action:manipulation;color:var(--navy);background:#fffaf0;border:1px solid #98a3ac;border-radius:9px;min-height:40px;padding:8px 14px;font-weight:700}.sand-app button:hover{background:#f8eabf}.sand-app button:focus-visible,.sand-app canvas:focus-visible{outline:4px solid #ed9b22;outline-offset:3px}.sand-app button[aria-pressed=true]{background:#fff0b8;box-shadow:inset 0 0 0 2px var(--navy)}.lab-bar{display:flex;justify-content:space-between;align-items:center;gap:8px;background:var(--navy);color:var(--cream);padding:10px 18px;min-height:62px}.lab-bar>strong{font-size:16px;white-space:nowrap}.lab-bar>strong span{font-size:27px;vertical-align:middle;color:var(--yellow);margin-right:7px}.bar-buttons{display:flex;gap:5px;flex-wrap:wrap;justify-content:flex-end}.lab-bar button{border-color:#ffffff55;color:var(--cream);font-size:11px;background:transparent;min-height:37px;padding:7px 10px}.lab-bar button:hover{background:#ffffff22}.lab-bar button[aria-pressed=true]{background:#fff3bd;color:var(--navy);box-shadow:none}.lab-scenes{height:790px;position:relative}.scene{height:100%;position:relative}.cover{background:url('./assets/desk/terrarium.webp') center/cover no-repeat;padding:70px 6%;display:flex;align-items:center}.cover-copy{width:48%;padding-bottom:60px}.eyebrow{font-size:12px;letter-spacing:.08em;font-weight:700;margin:0 0 24px}.cover h1{font-size:clamp(36px,5.2vw,67px);font-weight:900;letter-spacing:.025em;line-height:1.25;margin:0 0 22px}.cover h1 span{display:block;font-size:.72em;line-height:1.7}.cover-lead{font-size:19px;font-weight:700;margin:0 0 24px}.sand-app .primary{background:var(--coral);color:#fffaf0;border:2px solid #fff4d5;box-shadow:0 3px 0 #993e34;min-height:48px;padding:11px 20px;font-size:17px;border-radius:12px}.sand-app .primary:hover{background:#c33d30}.sand-app .primary:active{transform:translateY(2px);box-shadow:0 1px 0 #993e34}.cover .primary{display:flex;gap:18px;justify-content:space-between;min-height:60px;font-size:20px;min-width:330px}.cover-note{font-size:11px;line-height:1.8;margin-top:16px;width:fit-content;padding:3px 6px;background:#fff9e9d9;border-radius:4px}.cover-steps{position:absolute;bottom:27px;left:6%;right:6%;display:flex;gap:32px;background:#fff9e9ef;padding:16px 25px;border-radius:12px;border:1px solid #ded5bb;justify-content:center}.cover-steps span{font-size:14px;font-weight:700;display:flex;gap:9px;align-items:center}.cover-steps b{background:var(--yellow);color:var(--navy);border-radius:50%;width:30px;height:30px;display:grid;place-items:center}.play,.result{background:url('./assets/desk/desk.webp') center/cover no-repeat}.workspace{height:100%;padding:18px 24px 12px;display:grid;grid-template-rows:minmax(0,1fr) 83px 48px 24px;gap:9px;max-width:1160px;margin:auto}.board-area{display:flex;flex-direction:column;align-items:center;min-height:0;min-width:0}.board-head{width:min(100%,730px);display:flex;justify-content:space-between;align-items:center;min-height:27px;font-size:12px;padding:0 4px 5px}.board-head span{font-size:11px}.board-frame{position:relative;width:auto;height:calc(100% - 27px);max-width:100%;aspect-ratio:10/7;border:4px solid var(--navy);border-radius:9px;background:#d9f1f7;box-shadow:0 3px 0 #c9b996;overflow:hidden;flex:none}.board-frame canvas{display:block;width:100%;height:100%;image-rendering:pixelated;touch-action:none;cursor:crosshair;outline-offset:-5px!important}#box-guide{position:absolute;left:50%;top:40%;transform:translate(-50%,-50%);font-size:18px;font-weight:700;line-height:1.9;text-align:center;white-space:nowrap;pointer-events:none;padding:10px 20px;background:#fffffbd9;border:1px dashed #7fadb7;border-radius:12px;margin:0}#key-cursor{position:absolute;width:18px;height:18px;border:2px solid #193963;outline:2px solid #fff;border-radius:50%;transform:translate(-50%,-50%);pointer-events:none}.materials{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px}.sand-app .material{padding:4px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;border:2px solid #b1b3ab;background:#fffdf4;min-width:0;min-height:0;font-size:15px;border-radius:12px}.material svg{width:36px;height:36px;flex-shrink:0}.sand-app .material[aria-pressed=true]{background:#fff0b4;border-color:var(--navy);box-shadow:inset 0 0 0 2px var(--navy)}.bench-controls{display:flex;align-items:center;justify-content:space-between;gap:10px}.brushes,.actions{display:flex;align-items:center;gap:7px}.brushes>span{font-size:12px;font-weight:700;margin-right:2px}.brushes button{display:flex;align-items:center;gap:6px;font-size:11px;padding:7px 9px}.dot{display:block;border-radius:50%;background:var(--navy)}.dot.small{width:5px;height:5px}.dot.medium{width:9px;height:9px}.dot.large{width:14px;height:14px}.actions button{font-size:12px;padding:7px 12px;white-space:nowrap}.sand-app #finish{min-height:43px;padding:7px 18px;font-size:14px}.tool-hint{font-size:12px;line-height:1.5;text-align:center;margin:0;background:#fff9e9dd;border-radius:5px;align-self:center}.result{padding:36px 6%;display:flex;flex-direction:column;justify-content:center;align-items:center}.result h2{font-size:30px;letter-spacing:.05em;margin:0 0 30px;text-align:center}.result-layout{width:100%;display:grid;grid-template-columns:minmax(0,2fr) minmax(230px,1fr);align-items:center;gap:30px}.world-photo{margin:0;background:#fffef9;padding:14px 14px 8px;box-shadow:0 6px 18px #173a591e;position:relative;min-width:0;transform:rotate(-1deg)}.world-photo::before,.world-photo::after{content:'';width:65px;height:23px;background:#efc54cc4;position:absolute;transform:rotate(-27deg)}.world-photo::before{left:-14px;top:4px}.world-photo::after{right:-15px;bottom:18px}.world-photo canvas{width:100%;height:auto;display:block;aspect-ratio:10/7;image-rendering:pixelated}.world-photo figcaption{font-size:12px;text-align:center;line-height:1.8;margin-top:12px}.observations{border-left:2px solid var(--navy);padding-left:24px}.observations h3{font-size:16px;line-height:1.6;margin:0 0 15px}.observations dl{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:7px 15px}.count-row{display:flex;align-items:center;justify-content:space-between;border-bottom:1px dashed #acb2b5;padding:6px 0;gap:10px;font-size:13px}.count-row dt,.count-row dd{margin:0}.count-row dd{font-size:19px;font-weight:900;font-variant-numeric:tabular-nums}.total{font-size:13px;margin:18px 0}.total b{font-size:23px}.result-actions{display:grid;gap:11px}.sand-app .secondary{background:#fffaf0;border:2px solid var(--navy);font-size:14px;min-height:43px}.sand-app .text-button{background:transparent;border:0;text-decoration:underline;text-underline-offset:4px;font-size:12px;padding:7px;min-height:34px}.parent-note{max-width:950px;margin:28px auto 0;padding:18px 20px;background:#fff;border-radius:16px;color:#41576c}.parent-note h2{font-size:17px;margin:0 0 9px}.parent-note p{font-size:13px;line-height:1.9}.notice{position:absolute;bottom:0;left:0;right:0;background:var(--cream);font-size:12px;text-align:center;margin:0;z-index:3}.notice:empty{display:none}dialog{width:min(510px,calc(100% - 28px));max-height:90dvh;background:var(--cream);color:var(--navy);border:3px solid var(--navy);border-radius:18px;padding:25px;text-align:center;box-shadow:0 20px 70px #14395455}dialog::backdrop{background:#132b46a8}dialog h2{font-size:25px;margin:0 0 18px}#dialog-content{font-size:14px;line-height:1.85}#dialog-content p{margin:10px 0}#dialog-content ul{text-align:left;padding-left:22px}.dialog-actions{display:grid;gap:10px;margin-top:20px}.sand-app:fullscreen{width:100vw;height:100dvh;border:0;border-radius:0;display:flex;flex-direction:column}.sand-app:fullscreen .lab-scenes{height:auto;flex:1;min-height:0}.sand-app:fullscreen .workspace{max-width:1200px}.sand-app:fullscreen .result-layout{max-width:1140px}.sand-app:fullscreen .world-photo{max-width:calc((100dvh - 215px)*10/7)}
@media(max-width:850px){.lab-page{width:calc(100% - 16px);margin:16px auto 30px}.lab-bar{flex-wrap:wrap;gap:5px;padding:8px 11px;min-height:0}.lab-bar>strong{font-size:12px}.lab-bar>strong span{font-size:22px;margin-right:3px}.bar-buttons{gap:4px}.lab-bar button{font-size:10px;min-height:34px;padding:5px 7px}.lab-scenes{height:650px}.cover{padding:32px 24px;align-items:flex-start;background-size:auto 75%;background-position:right bottom;background-color:var(--cream)}.cover-copy{width:100%;padding-bottom:0}.cover h1{font-size:43px;margin-bottom:10px}.cover h1 span{font-size:.62em;line-height:1.5}.cover .eyebrow{font-size:10px;margin-bottom:14px}.cover-lead{font-size:15px;margin-bottom:15px}.cover .primary{min-width:0;width:min(100%,290px);min-height:50px;font-size:16px}.cover-note{font-size:10px;margin-top:10px}.cover-steps{bottom:14px;left:14px;right:14px;gap:8px;padding:10px 8px;justify-content:space-around}.cover-steps span{font-size:10px;gap:5px;flex-direction:column}.cover-steps b{width:23px;height:23px;font-size:11px}.workspace{padding:12px 10px 10px;grid-template-rows:minmax(0,1fr) 126px 91px 38px;gap:7px}.board-area{justify-content:center}.board-head{font-size:11px;min-height:25px}.board-frame{width:100%;height:auto;max-height:calc(100% - 25px);border-width:3px}.materials{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.sand-app .material{font-size:12px;flex-direction:row;gap:4px;border-radius:9px}.material svg{width:24px;height:24px}.sand-app .material:last-child{grid-column:4;grid-row:1 / 3;flex-direction:column}.bench-controls{flex-direction:column;align-items:stretch;justify-content:space-between;gap:6px}.brushes{justify-content:center;gap:5px}.brushes button{min-height:36px;padding:5px 8px;font-size:10px}.actions{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:5px}.actions button{font-size:10px;padding:6px 5px;min-height:39px}.sand-app #finish{font-size:12px;padding:6px 7px;min-height:39px}.tool-hint{font-size:11px;line-height:1.7;padding:0 5px;align-self:center}.result{padding:23px 18px}.result h2{font-size:22px;margin:0 0 22px;line-height:1.5}.result-layout{grid-template-columns:1fr;gap:20px;max-width:500px}.world-photo{padding:9px 9px 6px;transform:none}.world-photo figcaption{font-size:10px;margin-top:8px}.world-photo::before,.world-photo::after{width:43px;height:16px}.observations{border-left:0;padding-left:0}.observations h3{font-size:13px;margin-bottom:5px}.observations dl{grid-template-columns:repeat(4,1fr);gap:4px 10px}.count-row{font-size:10px;display:block;padding:4px 0}.count-row dd{font-size:16px}.total{font-size:11px;margin:9px 0}.total b{font-size:18px}.result-actions{grid-template-columns:1fr 1fr;gap:9px}.result-actions button{font-size:12px!important;padding:7px 8px!important;min-height:44px!important}.result-actions .text-button{grid-column:1 / -1;min-height:30px!important}.sand-app:fullscreen .cover{background-size:auto 70%}.sand-app:fullscreen .world-photo{max-width:100%}.sand-app:fullscreen .workspace{padding:8px 10px;grid-template-rows:minmax(0,1fr) 108px 87px 35px;gap:6px}.sand-app:fullscreen .board-frame{width:auto;height:auto;max-height:100%;max-width:100%}.sand-app:fullscreen .board-area{min-height:0}.sand-app:fullscreen .result{padding:16px 18px}.sand-app:fullscreen .result-layout{max-height:100%;gap:12px;min-height:0}.sand-app:fullscreen .world-photo{max-width:calc((100dvh - 400px)*10/7);justify-self:center}.sand-app:fullscreen .world-photo figcaption{display:none}.sand-app:fullscreen .result h2{font-size:20px;margin-bottom:15px}}
@media(max-width:360px){.cover{padding:23px 18px}.cover h1{font-size:38px}.cover-lead{font-size:13px}.cover .eyebrow{font-size:9px}.cover-steps{left:9px;right:9px}.workspace{padding:8px 7px}.lab-scenes{height:610px}.material svg{width:21px;height:21px}.sand-app .material{font-size:11px}.lab-bar button{font-size:9px;padding:5px 6px}.sand-app:fullscreen .workspace{grid-template-rows:minmax(0,1fr) 96px 82px 32px;padding:6px 7px;gap:5px}#box-guide{font-size:13px;padding:8px 12px}.sand-app:fullscreen .result h2{font-size:17px;margin-bottom:10px}.sand-app:fullscreen .result{padding:12px}.observations dl{gap:3px 7px}.count-row{font-size:9px}.count-row dd{font-size:14px}}
@media(max-height:520px) and (min-width:600px){.lab-bar{padding:5px 12px;flex-wrap:nowrap;min-height:42px}.lab-bar>strong{font-size:11px}.lab-bar button{font-size:9px;min-height:31px;padding:5px 7px}.lab-scenes{height:480px}.cover{padding:20px 5%;align-items:center;background-size:cover;background-position:center}.cover-copy{width:47%;padding-bottom:35px}.cover h1{font-size:40px;margin-bottom:10px}.cover .eyebrow{margin-bottom:10px;font-size:9px}.cover-lead{font-size:13px;margin-bottom:12px}.cover .primary{font-size:14px;min-height:44px;width:275px;max-width:100%}.cover-note{font-size:9px;margin-top:10px}.cover-steps{padding:8px 15px;bottom:14px;gap:20px;left:5%;right:5%}.cover-steps span{flex-direction:row;font-size:10px}.cover-steps b{width:20px;height:20px;font-size:10px}.sand-app:fullscreen .cover{background-size:cover}.workspace,.sand-app:fullscreen .workspace{padding:8px 12px;grid-template-columns:155px minmax(0,1fr);grid-template-rows:minmax(0,1fr) 38px;gap:7px 16px;max-width:850px}.board-area{grid-column:2;grid-row:1;justify-content:center}.board-head{width:min(100%,470px);min-height:20px;font-size:10px}.board-head span{font-size:9px}.board-frame,.sand-app:fullscreen .board-frame{height:calc(100% - 20px);width:auto;max-width:100%;border-width:3px}.materials{grid-column:1;grid-row:1;grid-template-columns:1fr 1fr;grid-template-rows:repeat(4,minmax(0,1fr));gap:5px;align-self:stretch}.sand-app .material{font-size:11px;min-height:0;flex-direction:row;padding:2px}.material svg{width:22px;height:22px}.sand-app .material:last-child{grid-row:4;grid-column:1 / -1;flex-direction:row}.bench-controls{grid-column:1 / -1;grid-row:2;flex-direction:row;gap:8px;align-items:center}.brushes{gap:4px}.brushes>span{font-size:10px}.brushes button{font-size:9px;min-height:32px;padding:5px 6px}.actions{display:flex;gap:5px}.actions button{font-size:10px;min-height:32px;padding:5px 8px}.sand-app #finish{font-size:11px;min-height:34px;padding:6px 11px}.tool-hint{display:none}#box-guide{font-size:13px;padding:7px 12px}.result,.sand-app:fullscreen .result{padding:14px 5%}.result h2,.sand-app:fullscreen .result h2{font-size:20px;margin-bottom:12px}.result-layout,.sand-app:fullscreen .result-layout{grid-template-columns:minmax(0,1.5fr) minmax(225px,1fr);gap:24px;min-height:0;height:100%;width:100%;max-width:940px}.world-photo,.sand-app:fullscreen .world-photo{max-width:calc((100dvh - 132px)*10/7);width:100%;padding:8px;justify-self:center}.world-photo figcaption{display:none}.observations{padding-left:15px;border-left:1px solid var(--navy)}.observations h3{font-size:12px;margin:0 0 8px}.observations dl{grid-template-columns:repeat(4,1fr);gap:5px 7px}.count-row{font-size:9px;padding:3px 0}.count-row dd{font-size:14px}.total{font-size:10px;margin:8px 0}.total b{font-size:15px}.result-actions{display:grid;grid-template-columns:1fr;gap:6px}.result-actions button{min-height:32px!important;font-size:11px!important;padding:5px 8px!important}.result-actions .text-button{min-height:25px!important}.sand-app:fullscreen .cover-copy{padding-bottom:30px}}
/* Fit the simulation as one 10:7 surface, including short landscape screens. */
.board-area{container-type:size;--board-head-height:27px}
.sand-app .board-frame,.sand-app:fullscreen .board-frame{width:min(calc(100% - 6px),calc((100cqh - var(--board-head-height) - 6px)*10/7));height:auto;max-height:none;max-width:none;aspect-ratio:10/7;border:0;outline:3px solid var(--navy)}
@media(max-width:850px){.board-area{--board-head-height:25px}}
@media(max-height:520px) and (min-width:600px){.board-area{--board-head-height:20px}}
.board-head{flex-shrink:0}
.cover-lead{width:fit-content;background:#fff9e9e8;border-radius:4px;padding:2px 4px}
@media(max-width:360px){.lab-bar>strong{flex-basis:100%}.bar-buttons{width:100%;justify-content:center;gap:3px}.lab-bar button{padding:5px 3px;font-size:9px;white-space:nowrap;flex:1;line-height:1.4}.sand-app:fullscreen .world-photo{max-width:calc((100dvh - 430px)*10/7)}}