:root{color-scheme:dark;--bg:#102727;--panel:#163030;--line:#2c4442;--muted:#94aaa3;--cream:#edf1dc;--green:#c7e5a1}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--cream);font-family:Arial,Helvetica,sans-serif;height:100dvh;overflow:hidden;overscroll-behavior:none}button,input,select{font:inherit}button{color:inherit;cursor:pointer;border:1px solid transparent;background:transparent;border-radius:9px;min-height:44px;touch-action:manipulation}button:hover{background:#ffffff0c}button:focus-visible,input:focus-visible,select:focus-visible,canvas:focus-visible{outline:2px solid var(--green);outline-offset:3px}header{height:100px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:14px}.brand-mark{background:var(--green);color:#1a3631;display:grid;place-items:center;font-size:42px;width:48px;height:48px;border-radius:14px;line-height:1}h1{font-size:25px;letter-spacing:-1px;margin:0;font-weight:600}h1 span{font-size:14px;letter-spacing:0;color:var(--muted);font-weight:400}.brand p{font-size:12px;margin:7px 0 0;color:var(--muted)}.head-actions{display:flex;align-items:center;gap:10px}.head-actions button{border-color:var(--line);font-size:23px;width:44px}.head-actions #help{font-size:18px}#live{font-size:10px;letter-spacing:1.4px;color:var(--muted);margin-right:14px}i{display:inline-block;width:6px;height:6px;border-radius:100%;background:var(--green);margin-right:8px}main{display:grid;grid-template-columns:236px 1fr;height:calc(100dvh - 100px)}aside{padding:26px 22px;overflow-y:auto;border-right:1px solid var(--line);display:flex;flex-direction:column}.section-label{font-size:10px;letter-spacing:1.9px;color:var(--muted);font-weight:600}.materials{display:grid;gap:5px;margin-top:14px}.materials button{display:flex;align-items:center;text-align:left;gap:12px;padding:10px 11px;width:100%}.materials button.selected{background:#29423a;border-color:#779463}.swatch{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:27px}.sand{color:#ecc87d;background:#59472c}.water{color:#9de4ef;background:#234f61}.rock{color:#c3c6c6;background:#464e51}.wall{color:#a8bdab;background:#344f43}.materials button>span+span{font-size:14px}.materials small{display:block;font-size:10px;color:var(--muted);margin-top:5px}.tools-label{margin-top:25px}.tools{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:12px}.tools button{border-color:var(--line);font-size:16px;padding:8px 3px}.tools button span{font-size:11px;margin-left:3px}.tools button.selected{color:var(--bg);background:var(--green);border-color:var(--green)}.slider-label{display:flex;justify-content:space-between;font-size:11px;margin:19px 0 10px}output{color:var(--muted)}input[type=range]{width:100%;accent-color:var(--green);height:22px;cursor:pointer;margin:0;touch-action:pan-x}.environment{margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}.toggles{display:flex;gap:6px;margin:8px 0}.toggles button{font-size:10px;border-color:var(--line);flex:1;padding:7px 2px}.toggles button[aria-pressed=true]{color:var(--green);border-color:var(--green)}.quality{font-size:10px;color:var(--muted);display:block;margin-top:12px}select{width:100%;background:var(--bg);color:var(--cream);border:1px solid var(--line);padding:8px;border-radius:7px;min-height:40px;margin-top:6px;font-size:11px}.side-footer{margin-top:auto;padding-top:28px}.side-footer span{font-size:8px;letter-spacing:1.4px;color:var(--muted)}.side-footer p{font-size:11px;color:var(--muted)}.play-area{display:flex;flex-direction:column;min-width:0;padding:22px 28px 16px}.canvas-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;height:37px}.world-label{font-size:10px;letter-spacing:1.5px}.canvas-top button{font-size:11px;padding:0 12px;min-height:36px;border:1px solid var(--line);margin-left:5px}.stage{position:relative;flex:1;min-height:100px;border:1px solid #40534a;border-radius:14px;overflow:hidden;background:#0b2021;box-shadow:inset 0 0 80px #0002}canvas{display:block;width:100%;height:100%;touch-action:none;user-select:none;-webkit-user-select:none}#intro{position:absolute;top:35px;left:32px;pointer-events:none;transition:opacity .7s}#intro span{font-size:10px;letter-spacing:2px;color:#c7e5a1}#intro p{font-family:Georgia,serif;font-size:clamp(18px,2.2vw,30px);margin:10px 0;color:#e4ecd6}#cursor{position:absolute;border:1px solid #e3edc870;border-radius:50%;pointer-events:none;display:none;transform:translate(-50%,-50%)}.stage-bottom{position:absolute;bottom:14px;left:20px;right:20px;display:flex;justify-content:space-between;pointer-events:none;font-size:10px;color:#afc3b0;gap:10px;text-shadow:0 1px 3px #000}.bottom-bar{padding-top:15px;display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}.scene-group,.utilities{display:flex;gap:5px;align-items:center}.scene-group>span{font-size:8px;color:var(--muted);letter-spacing:1px;margin-right:6px}.bottom-bar button{font-size:10px;min-height:40px;padding:0 10px;border:1px solid var(--line)}.scene-group button.active{border-color:#9ab47f;color:var(--green)}#reset{color:#e9c88e}#toast{position:absolute;top:18px;left:50%;transform:translateX(-50%);background:#c7e5a1;color:#15332e;padding:12px 18px;border-radius:30px;font-size:12px;opacity:0;pointer-events:none;max-width:90%;text-align:center;transition:opacity .2s}#toast.show{opacity:1}dialog{background:#173330;color:var(--cream);border:1px solid #718a69;border-radius:20px;max-width:500px;width:90%;padding:32px;box-shadow:0 20px 100px #0006}dialog::backdrop{background:#061514b9}dialog .close{position:absolute;top:8px;right:10px;font-size:25px;width:44px}dialog h2{font:32px Georgia,serif;margin:18px 0}dialog p,dialog li{font-size:13px;line-height:1.65;color:#c1d0c0}dialog ul{padding-left:18px}dialog li{margin-bottom:10px}dialog .fine{font-size:11px;color:var(--muted)}.primary{background:var(--green);color:var(--bg);padding:10px 20px;margin-top:10px}
@media(max-height:800px) and (min-width:701px){header{height:76px}main{height:calc(100dvh - 76px)}aside{padding:18px}.materials{gap:1px}.materials button{padding:6px 9px}.tools-label{margin-top:16px}.environment{margin-top:15px;padding-top:15px}.side-footer{display:none}.play-area{padding-top:12px}}@media(max-width:1000px){.play-area{padding:14px}main{grid-template-columns:210px 1fr}.bottom-bar{gap:5px}.scene-group>span{display:none}.bottom-bar button{padding:0 7px}.brand p{display:none}header{padding:0 22px}#live{display:none}}@media(max-width:700px){header{height:64px;padding:0 15px}h1{font-size:22px}h1 span{font-size:11px}.brand-mark{width:36px;height:36px;font-size:32px}.head-actions{gap:5px}.head-actions button{width:40px;min-height:40px}main{height:calc(100dvh - 64px);display:flex;flex-direction:column-reverse}aside{border:0;border-top:1px solid var(--line);padding:9px 12px max(9px,env(safe-area-inset-bottom));flex:none;max-height:210px;display:grid;grid-template-columns:1fr 1fr;gap:6px 12px}.section-label,.materials small,.tools-label,.environment,.side-footer{display:none}.materials{grid-column:1/-1;display:flex;margin:0;gap:5px}.materials button{justify-content:center;padding:5px;gap:5px;min-height:42px}.materials button>span+span{font-size:11px}.swatch{width:27px;height:27px;font-size:23px}.tools{grid-column:1/-1;display:flex;margin:0;gap:5px}.tools button{flex:1;min-height:40px;padding:5px 1px;font-size:15px}.tools button span{font-size:10px;margin-left:1px}.slider-label{margin:4px 0;align-items:center;font-size:10px}#brush{height:24px;align-self:center}.play-area{flex:1;min-height:0;padding:5px 10px 8px}.canvas-top{margin-bottom:5px;height:35px}.canvas-top button{min-height:32px;padding:0 9px}.world-label{font-size:8px}.bottom-bar{padding-top:7px;gap:3px;justify-content:center}.bottom-bar button{font-size:9px;min-height:34px;padding:0 6px}.scene-group,.utilities{gap:3px}#intro{top:22px;left:20px}#intro span{font-size:8px}#intro p{font-size:20px}.stage-bottom{font-size:8px;left:12px;right:12px;bottom:10px}}@media(max-height:500px){header{height:54px}main{height:calc(100dvh - 54px)}#intro{display:none}.side-footer{display:none}}

/* Playful lab palette and touch-first refinements. */
:root{--bg:#142b40;--panel:#1c3850;--line:#3c5267;--muted:#b0c4d7;--cream:#f6f4e9;--green:#a9ed83}
header{background:#19344c}.brand-mark{background:#ffd677;transform:rotate(-7deg);box-shadow:3px 4px 0 #0a1d2c}.brand h1{font-weight:800;letter-spacing:-1.2px}.brand h1 span{font-size:12px;font-weight:700;color:#a9ed83;letter-spacing:2px}.materials button{border-radius:12px}.materials button.selected{background:#334a5d;border-color:#a9ed83}.materials button.selected[data-material=sand]{border-color:#ffd677;background:#514c3c}.materials button.selected[data-material=water]{border-color:#60d9ff;background:#224d66}.materials button.selected[data-material=rock]{border-color:#c0a8ff;background:#3b3d62}.materials button.selected[data-material=wall]{border-color:#a9ed83;background:#304e46}.sand{background:#6a5033;color:#ffe09b}.water{background:#1e536d;color:#60d9ff}.rock{background:#4e466d;color:#d1bcff}.wall{background:#345247;color:#bcf39e}.tools button.selected{background:#a9ed83;color:#142b40;box-shadow:0 3px 0 #5b995d}.tools button{border-radius:10px}.stage{border:2px solid #526c80;box-shadow:0 6px 0 #0b1e2e;background:#102f40}.stage-bottom{color:#c4dceb}.environment summary{font-size:12px;cursor:pointer;min-height:44px;display:flex;align-items:center;color:#d9e8f3}.environment[open] summary{margin-bottom:8px}.environment .section-label{display:none}.bottom-bar{padding-top:19px}.bottom-bar button{min-height:44px}.canvas-top button{min-height:44px}.canvas-top{height:44px}.scene-group,.utilities{flex-wrap:wrap;min-width:0}.scene-group button.active{background:#284855}.materials button small{color:#c0ccda}dialog{background:#1d3951;border-color:#64cdf1}#intro span{color:#ffdb83}#intro p{font-family:Arial,Helvetica,sans-serif;font-weight:800;letter-spacing:-1px;color:#f5f1e4}.quality select{background:#142b40}.head-actions button{background:#203e56}header{padding-left:max(22px,env(safe-area-inset-left));padding-right:max(22px,env(safe-area-inset-right))}main{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}
@media(max-width:700px){aside{max-height:245px;overflow-y:auto;display:grid;grid-template-columns:1fr 1fr}.environment{display:block;grid-column:1/-1;margin-top:2px;padding-top:0;border:0}.environment summary{min-height:44px;margin-bottom:0!important}.environment .slider-label,.environment input,.environment .toggles,.environment .quality{display:none}.environment[open] .slider-label{display:flex}.environment[open] input{display:block}.environment[open] .toggles{display:flex}.environment[open] .quality{display:block}.environment[open]{padding-bottom:8px}.head-actions button,.tools button,.materials button,.canvas-top button,.bottom-bar button{min-height:44px}.canvas-top{height:44px}.bottom-bar{padding-top:10px}.play-area{padding-bottom:10px}.bottom-bar .scene-group,.bottom-bar .utilities{justify-content:center}.bottom-bar{flex-wrap:wrap}.scene-group{flex:1 1 250px}.utilities{flex:0 0 auto}}
@media(max-width:700px) and (max-height:600px){body{overflow:auto;height:auto;min-height:100dvh}main{height:auto;min-height:calc(100dvh - 64px)}.play-area{min-height:340px}.stage{min-height:220px}aside{max-height:none}.environment:not([open]){min-height:44px}}
/* Keep the drawing buffer from determining the flex/grid layout size. */
main,.play-area{min-height:0}main{grid-template-rows:minmax(0,1fr)}.stage{flex:1 1 0}canvas{position:absolute;inset:0}.canvas-top,.bottom-bar{flex-shrink:0}
.stage-bottom{background:#102f40df;padding:7px 10px;border-radius:8px;align-items:center}.stage-bottom #stats{text-align:right}

.environment summary::after{content:'▾';margin-left:auto}.environment:not([open]) summary::after{content:'▸'}
@media(min-width:701px) and (max-height:800px){.slider-label{margin:12px 0 6px}.environment{margin-top:10px;padding-top:10px}.tools button{font-size:14px}.tools button span{font-size:10px}}

#resume{position:absolute;z-index:5;left:50%;top:20px;transform:translateX(-50%);background:#ffda79;color:#102f40;font-weight:800;padding:14px 22px;box-shadow:0 4px 20px #0005}#resume[hidden]{display:none}.is-paused #pause{background:#ffda79;color:#102f40}