[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
body:not([data-page=lab]){background:linear-gradient(#173624b0,#173624b0),url('assets/menu-cover.webp') center/cover fixed}body:not([data-page=lab]):before{opacity:0}
.entry-page{min-height:100dvh;position:relative;z-index:1;display:flex;align-items:center;justify-content:center;padding:28px 24px;color:#fff5df}.entry-page h1{font-weight:900;font-size:clamp(28px,3.8vw,48px);margin:18px 0 8px;text-shadow:0 2px 8px #193b26}.entry-page h1:focus{outline:none}
#cover-page{padding:0;flex-direction:column;background:#17362466;gap:18px}.cover-frame{position:relative;width:min(100%,177.7dvh,1800px);aspect-ratio:16/9;box-shadow:0 20px 70px #10282055}.cover-frame>img{display:block;width:100%;height:100%;object-fit:contain}.cover-start{position:absolute;left:35.5%;top:74%;width:29%;height:17%;border:0;background:transparent;border-radius:40px;cursor:pointer}.cover-start:hover{box-shadow:0 0 25px #e9ffc566}.cover-start:focus-visible{outline:4px solid #fff5d1;outline-offset:4px}.mobile-start{display:none!important}
.entry-content{width:min(1400px,100%)}.entry-heading{display:flex;justify-content:space-between;gap:12px}.nav-back{font:700 14px Nunito,sans-serif;padding:12px 18px;min-height:48px;background:#1b3b2ac4;color:#fff5df;border:1px solid #fff4d94d;border-radius:14px;cursor:pointer}.nav-button{font:900 17px Nunito,sans-serif;min-height:48px;border:1px solid #bdce81;background:#dcecaa;color:#24462d;border-radius:16px;padding:13px 24px;cursor:pointer}.nav-button:disabled{opacity:.6;cursor:default}.nav-back:focus-visible,.nav-button:focus-visible,.activity-card:focus-visible{outline:3px solid #f4db8a;outline-offset:5px}.entry-intro{margin:0 0 30px;color:#f4ecd8;font-size:17px}.activity-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.activity-card{padding:0;overflow:hidden;cursor:pointer;border:1px solid #dfdab387;border-radius:20px;background:#25462b;box-shadow:0 10px 32px #112b2b66;color:#fff5df;text-align:left;transition:box-shadow .2s}.activity-card:hover{box-shadow:0 10px 32px #10251dcc,0 0 0 2px #dceca8}.activity-card>img{width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;display:block}.activity-card>span{display:block;padding:17px 18px;font:900 20px Nunito,sans-serif;min-height:105px}.activity-card small{display:block;margin-top:5px;font-size:13px;line-height:1.5;font-weight:400;color:#f3ecd4}.entry-note{margin-top:24px;font-size:13px;line-height:1.6;color:#f1ecd9}
#contexts-page{background:linear-gradient(#142d26b8,#142d26db),var(--activity-image) center/cover}.context-content{width:min(900px,100%)}.context-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.context-option{border:1px solid #eee3bd5c;border-radius:24px;padding:28px;background:#18382dd9;backdrop-filter:blur(8px)}.context-option>img{width:40px;height:40px;filter:brightness(0) invert(1);opacity:.8}.context-option h2{font-size:28px;margin:12px 0 8px}.context-option p{margin:0 0 22px;color:#f1ecd9}.context-option .nav-button{width:100%}.context-option small{display:block;color:#dedec6;margin-top:13px;line-height:1.5}.lab-back{margin-bottom:16px}
@media(max-width:800px){.activity-gallery{grid-template-columns:1fr;gap:18px}.entry-page{align-items:flex-start;padding:20px 16px}.entry-intro{font-size:15px;margin-bottom:20px}.activity-card>span{min-height:0;padding:12px 16px;font-size:19px}.entry-content{max-width:580px}.context-grid{grid-template-columns:1fr}.context-option{padding:22px}.cover-frame{width:100%;flex:none}#cover-page{justify-content:center;align-items:center}.cover-start{display:none}.mobile-start{display:block!important;margin-bottom:20px;min-width:200px}.nav-back{padding:10px 12px}.entry-heading{gap:8px}}
@media(prefers-reduced-motion:reduce){.activity-card{transition:none}}
body:not([data-page=lab]){background:linear-gradient(#173624a8,#173624c9),url('assets/forest-immersive.webp') center/cover fixed}
#cover-page{isolation:isolate;overflow:hidden;background:#214537}#cover-page:before{content:"";position:absolute;inset:-40px;background:url('assets/menu-cover.webp') center/cover;filter:blur(35px);opacity:.22;z-index:-1;pointer-events:none}
#contexts-page{isolation:isolate;overflow:hidden;background:#193b2bc9}#contexts-page:before{content:"";position:absolute;inset:-25px;background:var(--activity-image) center/cover;filter:blur(14px);opacity:.23;z-index:-1;pointer-events:none}
@media(max-width:800px){.cover-start{display:block;left:29%;top:72%;width:42%;height:22%;min-height:48px}.mobile-start{display:none!important}}
/* Real start control, separate from the cover illustration. */
.cover-start{left:37%;top:75%;width:26%;height:14%;min-height:48px;min-width:140px;padding:5px;border:4px solid #976335;border-radius:100px;background:linear-gradient(#b58b52,#643a1c);box-shadow:0 8px 0 #4a321a,0 12px 24px #0c201b88;overflow:visible;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.start-face{display:flex;align-items:center;justify-content:center;gap:.35em;height:100%;border-radius:100px;background:linear-gradient(#a6df46 0%,#4c9b13 48%,#266407 100%);border:2px solid #d7ee8d;box-shadow:inset 0 4px 6px #e0ffa9a6,inset 0 -4px 5px #153c21aa;color:#fff4d1;font:900 clamp(18px,3.6vw,64px)/1 Nunito,sans-serif;text-shadow:0 3px 0 #325316,0 4px 6px #193819}
.start-face>span{font-size:.55em}.cover-start:hover{box-shadow:0 8px 0 #4a321a,0 12px 28px #142f17a6,0 0 24px #c4ef8066}
.activity-card{overflow:visible;touch-action:manipulation;-webkit-tap-highlight-color:transparent;transform-origin:center bottom;will-change:auto}
.activity-card>img{border-radius:19px 19px 0 0;pointer-events:none}.activity-card>span{pointer-events:none}.cover-start>span{pointer-events:none}
@keyframes lab-hop{0%,100%{transform:translateY(0) scale(1)}18%{transform:translateY(2px) scale(1.015,.975)}46%{transform:translateY(-12px) scale(.99,1.02)}70%{transform:translateY(0) scale(1.018,.98)}84%{transform:translateY(-4px) scale(1)}}
@keyframes lab-tap{0%{transform:scale(1)}28%{transform:translateY(2px) scale(.965)}65%{transform:translateY(-8px) scale(1.015)}100%{transform:scale(1)}}
@media(hover:hover) and (pointer:fine){.cover-start:hover,.activity-card:hover{animation:lab-hop .9s ease-in-out infinite;will-change:transform}}
.cover-start:focus-visible,.activity-card:focus-visible{animation:lab-hop .9s ease-in-out infinite}
.cover-start.tap-bounce,.activity-card.tap-bounce{animation:lab-tap .22s ease-out!important}
@media(max-width:800px){.cover-start{left:29%;top:75%;width:42%;height:17%;min-height:48px;border-width:3px}.start-face{font-size:clamp(18px,5vw,32px)}.entry-heading{flex-wrap:wrap}.entry-page{padding-bottom:max(24px,env(safe-area-inset-bottom))}}
@media(hover:none){.entry-page{background-attachment:scroll}body:not([data-page=lab]){background-attachment:scroll}.cover-start:active,.activity-card:active{transform:scale(.97)}}
@media(prefers-reduced-motion:reduce){.cover-start,.activity-card{animation:none!important;transition:none!important}}
/* Context artwork stays local; decorative motion never covers controls. */
.context-content{width:min(1160px,100%)}
.context-option{overflow:hidden;padding:0 0 24px;background:#193c2eea}
.context-art{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;border-bottom:1px solid #f6e4a538;isolation:isolate}
.context-art>img{display:block;width:100%;height:100%;object-fit:cover}
.context-motion{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.context-option h2,.context-option p,.context-option small{margin-left:24px;margin-right:24px}
.context-option h2{margin-top:20px}.context-option .nav-button{width:calc(100% - 48px);margin-left:24px;margin-right:24px}
@media(max-width:800px){.context-option{padding:0 0 22px}.context-grid{gap:24px}.context-option h2,.context-option p,.context-option small{margin-left:20px;margin-right:20px}.context-option .nav-button{width:calc(100% - 40px);margin-left:20px;margin-right:20px}}
/* Centered lab identity, balanced independently of the controls on the right. */
:is(#lab-page,#air-page) .topbar{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;padding:24px 5%;min-height:116px}
:is(#lab-page,#air-page) .brand{grid-column:2;justify-self:center;justify-content:center;gap:18px;font-family:Nunito,sans-serif;font-weight:900;font-size:clamp(32px,3.9vw,56px);letter-spacing:.035em;line-height:1.08;text-align:center;color:#ffefba;text-shadow:0 2px 0 #7a5731,0 4px 0 #304c2a,0 7px 14px #112a2480}
:is(#lab-page,#air-page) .brand>span:last-child{display:block}
:is(#lab-page,#air-page) .brand small{margin-top:10px;font-size:clamp(11px,1.2vw,16px);line-height:1.35;font-weight:900;letter-spacing:.17em;color:#e6f4cc;text-shadow:0 2px 4px #163929}
:is(#lab-page,#air-page) .brandmark{width:62px;height:62px;flex-shrink:0;border-radius:20px;border:2px solid #e9e2af80;background:linear-gradient(145deg,#c1d57a42,#3354355c);box-shadow:inset 0 2px 4px #eef4b833,0 5px 14px #142e2433}
:is(#lab-page,#air-page) .brandmark img{width:34px;height:34px}
:is(#lab-page,#air-page) .header-right{grid-column:3;justify-self:end;gap:14px}
@media(max-width:700px){:is(#lab-page,#air-page) .topbar{grid-template-columns:1fr;gap:14px;padding:20px 16px 14px}:is(#lab-page,#air-page) .brand{grid-column:1;gap:12px;font-size:clamp(30px,8.5vw,44px)}:is(#lab-page,#air-page) .brand small{font-size:clamp(9px,2.55vw,12px);letter-spacing:.12em;margin-top:8px}:is(#lab-page,#air-page) .brandmark{width:48px;height:48px;border-radius:16px}:is(#lab-page,#air-page) .brandmark img{width:28px;height:28px}:is(#lab-page,#air-page) .header-right{grid-column:1;justify-self:center;gap:16px}:is(#lab-page,#air-page) .class-tag{font-size:10px}}
body[data-page=air]{background:linear-gradient(#163c3238,#173b3066),url('assets/context-air.webp') center/cover fixed}
#air-page .world{background:linear-gradient(#d5e8ce22,#173c3740),url('assets/context-air.webp') center/cover}
#air-scene{position:absolute;inset:0;display:block;width:100%;height:100%;touch-action:none;outline-offset:-4px}
#air-scene-loading{position:absolute;z-index:3;top:45%;left:25%;color:#fff9da;background:#254535cc;border-radius:12px;padding:12px}
#air-fallback{position:absolute;left:18%;right:18%;top:32%;font-size:12px}#air-fallback-water{position:absolute;inset:55% 0 0;background:#328aa1c9;border-top:3px solid #d4fff8;transition:top 1s}
#air-page .fallback-soil{background:#8f7753;border-top:3px solid #f6db8c;transform:none}
#air-page .river-status{margin-top:18px;padding:12px;border:1px solid #dcf4d552;border-radius:12px;color:#f6f0cc;font-size:12px}
#air-page .console-foot{font-size:11px;line-height:1.5}#air-page .result-equation{margin-top:14px}
#air-zoom-value{font-weight:900;font-size:12px;min-width:42px;text-align:center}
#air-page .live{white-space:nowrap}#air-page .title-row h1{font-size:clamp(24px,3vw,36px)}#air-page .title-row h1 span{display:block;margin:5px 0 0;font-weight:900;font-size:.7em}
@media(max-width:700px){#air-page .sensor #air-depth-text{display:none}}

/* Portrait artwork fills the phone, with real controls above decorative motion. */
.cover-frame>picture{display:block;width:100%;height:100%}.cover-frame>picture>img{display:block;width:100%;height:100%;object-fit:cover}
#cover-motion{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none}
.cover-start{z-index:2}
.sound-toggle{position:fixed;top:max(12px,env(safe-area-inset-top));right:max(12px,env(safe-area-inset-right));z-index:100;padding:10px 14px;min-height:44px;max-width:240px;border:1px solid #fff0c57a;border-radius:22px;background:#18392edb;color:#fff4d1;font:800 13px Nunito,sans-serif;box-shadow:0 3px 12px #102a2544;cursor:pointer;backdrop-filter:blur(8px)}
.sound-toggle:focus-visible{outline:3px solid #f4db8a;outline-offset:3px}
#activities-page,#contexts-page{padding-top:76px}
:is(#lab-page,#air-page) .topbar{padding-top:64px}
@media(max-width:800px) and (orientation:portrait){
 #cover-page{height:100svh;min-height:100svh;padding:0;gap:0}
 .cover-frame{width:100%;height:100svh;aspect-ratio:auto;box-shadow:none}
 .cover-start{left:20%;top:auto;bottom:max(8%,env(safe-area-inset-bottom));width:60%;height:74px;min-width:0}
 .start-face{font-size:clamp(24px,7vw,42px)}
 .sound-toggle{font-size:11px;padding:9px 12px;max-width:210px}
}

.cover-guide{position:fixed;top:max(12px,env(safe-area-inset-top));right:max(12px,env(safe-area-inset-right));z-index:101;min-height:44px;padding:10px 16px;border:1px solid #acd6e7;border-radius:22px;background:#edf9fff2;color:#17445f;font:900 13px Nunito,sans-serif;box-shadow:0 3px 12px #102a2533;cursor:pointer;backdrop-filter:blur(8px)}
.cover-guide span{display:inline-grid;place-items:center;width:20px;height:20px;margin-left:5px;border:1px solid #357391;border-radius:50%}
.cover-guide:hover{background:#cfedff;transform:translateY(-2px)}
.cover-guide:active{transform:scale(.97)}
.cover-guide:focus-visible{outline:3px solid #17698c;outline-offset:3px}
body[data-page="cover"] .sound-toggle{top:calc(max(12px,env(safe-area-inset-top)) + 54px)}
#classroom-guide{color-scheme:light;background:#f0f9ff;color:#173f59;border:1px solid #7eabc3;max-height:calc(100svh - 32px);overflow:auto;max-width:580px;width:calc(100% - 28px);padding:22px;border-radius:20px}
#classroom-guide h2{font-size:22px;line-height:1.25;letter-spacing:-.025em}
#classroom-guide p,#classroom-guide li{color:#284f68;font-size:13px;line-height:1.65}
#classroom-guide details{border-top:1px solid #b4d3e4;margin-top:14px;padding-top:2px}
#classroom-guide summary{color:#17445f;font-size:14px;font-weight:900;min-height:44px;padding:10px 0;margin:0}
#classroom-guide ol,#classroom-guide ul{padding-left:22px;margin:6px 0 12px}
#classroom-guide li{padding-left:3px;margin-bottom:10px}
#classroom-guide b{color:#173f59}
#classroom-guide .icon-button{background:#d7effd;color:#17445f;border:1px solid #7eabc3;box-shadow:none}
#classroom-guide .icon-button img{filter:brightness(0) saturate(100%) invert(24%) sepia(30%) saturate(1242%) hue-rotate(162deg) brightness(93%) contrast(94%)}
#classroom-guide :focus-visible{outline:3px solid #17698c;outline-offset:3px}
@media(max-width:420px){#classroom-guide{padding:18px}#classroom-guide h2{font-size:20px}.cover-guide{font-size:12px}}
@media(prefers-reduced-motion:reduce){.cover-guide:hover,.cover-guide:active{transform:none}}