@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');
:root{font-family:'DM Sans',Arial,sans-serif;background:#082b2e;color:#eff4e8;--gold:#f0d28b;--mint:#88d4c3}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:radial-gradient(ellipse at top left,#25534e,transparent 65%)}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #fff2b7;outline-offset:4px}button{color:inherit}h1,h2,strong{font-family:'Outfit',sans-serif}button,dialog{border-radius:12px}.nav{display:flex;align-items:center;gap:22px;padding:17px 4vw;border-bottom:1px solid #c3e0c526;font-size:12px}.nav a{text-decoration:none}.brand{margin-right:auto;font:700 16px 'Outfit';letter-spacing:.12em}.brand span{display:block;font:600 7px 'DM Sans';letter-spacing:.27em;margin-top:5px}.quiet,.secondary{border:1px solid #b5d8c655;background:#123b3a;color:#eff4e8;padding:12px 16px;font-weight:700;font-size:13px}.primary{border:1px solid #ffe6ad;background:linear-gradient(120deg,#f4dba5,#e8c375);color:#193537;padding:15px 20px;font-weight:800;min-height:49px;box-shadow:0 6px 20px #0002}.primary:hover{filter:brightness(1.07)}.secondary:hover{background:#2a5650}.text-button{border:0;background:none;color:var(--gold);text-decoration:underline;text-underline-offset:4px;padding:10px 0;font-size:12px}.eyebrow{font-size:10px;letter-spacing:.16em;font-weight:800;color:var(--gold);line-height:1.5}.welcome{display:grid;grid-template-columns:1.1fr 1fr;max-width:1370px;margin:35px auto;padding:0 25px}.hero{min-height:680px;position:relative;isolation:isolate;overflow:hidden;padding:40px;border-radius:24px 0 0 24px;background:linear-gradient(#052b3b63,#063c3522),url('assets/wilderness/otter.webp') center/cover}.hero h1{font-size:clamp(52px,6vw,86px);line-height:.93;letter-spacing:-.055em;margin:35px 0;color:#fff0c5}.tagline{font:500 32px/1.15 'Outfit';text-shadow:0 2px 8px #06312c}.sprite{background:url('assets/wilderness/animals.webp') 0 0/300% 200% no-repeat;aspect-ratio:1;filter:drop-shadow(0 13px 7px #03282799)}.hero-otter{position:absolute;width:90%;left:7%;bottom:-4%;transform:rotate(-9deg)}.habitat{position:absolute;bottom:25px;left:40px;font-size:8px;letter-spacing:.16em}.setup{padding:36px;background:#113630e8;border:1px solid #d3dfb32b;border-radius:0 24px 24px 0}.setup h2{font-size:40px;font-weight:500;line-height:1.05;letter-spacing:-.04em;margin:22px 0}.setup>p{font-size:14px;line-height:1.7;color:#ccdfd4}.setup fieldset{padding:0;border:0;margin:25px 0 14px}.setup legend{font-weight:700;font-size:13px;margin-bottom:12px}.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.levels button{padding:14px 10px;text-align:left;border:1px solid #b1cfb442;background:#1a413b}.levels button[aria-pressed=true]{background:#45583e;border-color:var(--gold)}.levels small{display:block;color:var(--gold);font-size:9px}.levels strong{display:block;font-size:22px;margin-top:8px}.levels span{display:block;font-size:10px;margin-top:5px;color:#d1ddc4}.setup #levelNote{min-height:48px;font-size:13px}.calm{font-size:12px;display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:20px 0}.calm span{color:#b8cbb9;font-size:10px}.setup>.primary,.setup>.secondary{width:100%;margin:5px 0}.fine,.save-note{font-size:11px!important;line-height:1.65;color:#b2c8bc!important}.save-note{border-top:1px solid #aac5b326;padding-top:14px}#game{max-width:1500px;margin:22px auto;padding:0 28px}.game-head{display:flex;justify-content:space-between;align-items:center;gap:15px}.game-head h2{font-size:25px;font-weight:500;margin:2px 0 15px}.game-head .eyebrow{margin:0 0 5px}.stats{display:flex;gap:26px;align-items:center}.stats small{display:block;font-size:8px;letter-spacing:.12em;color:#bdd6c9}.stats b{display:block;font:600 24px 'Outfit';color:var(--gold);margin-top:4px}.progress{display:flex;gap:6px;margin-bottom:15px}.progress i{height:4px;border-radius:4px;background:#c5ddc425;flex:1}.progress .done{background:var(--mint)}.progress .current{background:var(--gold)}.expedition{display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,390px);gap:18px;align-items:stretch}.river{position:relative;min-height:555px;overflow:hidden;border:1px solid #d7e3bf44;border-radius:22px;background:linear-gradient(0deg,#082e34d9,transparent 60%),url('assets/wilderness/otter.webp') 50% 50%/cover;transition:background-position 1.5s}.river-light{position:absolute;inset:0;background:repeating-linear-gradient(115deg,transparent 0 10%,#dffff609 12%,transparent 20%);animation:light 13s ease-in-out infinite alternate;pointer-events:none}.scene-caption{position:absolute;left:24px;top:24px;display:flex;flex-direction:column;gap:8px;background:#092d35b8;backdrop-filter:blur(7px);border:1px solid #cce7d322;padding:14px 18px;border-radius:12px}.scene-caption span{font-size:9px;letter-spacing:.16em;color:#e3d39d}.scene-caption strong{font-size:16px;font-weight:500}.travel-area{position:absolute;left:12%;right:12%;bottom:105px;height:200px}.distance-track{position:absolute;left:0;right:0;bottom:0;height:33px;display:grid;grid-template-columns:repeat(var(--parts),1fr);border:1px solid #d9eee0;border-radius:5px;box-shadow:0 3px 15px #001c2460;overflow:hidden;background:#0c343aad}.distance-track i{border-right:1px solid #d9eee09c;transition:background .2s}.distance-track i:last-child{border:0}.distance-track i.covered{background:#edd087aa}.river-labels{position:absolute;top:calc(100% + 10px);left:0;right:0;display:flex;justify-content:space-between;font-size:9px;letter-spacing:.06em;color:#e2eee4}.swimmer{position:absolute;left:0;bottom:-15px;width:210px;height:210px;transform:translateX(-50%);z-index:3;pointer-events:none}.swimmer .sprite{width:100%;height:100%;background-position:50% 0;transform:scaleX(var(--facing,1)) rotate(var(--tilt,0deg));transition:transform .25s}.swimmer .wake{position:absolute;left:25%;right:25%;bottom:47%;height:10%;border-bottom:2px solid #c5efe893;border-radius:50%;filter:blur(1px)}.swimmer.swimming .wake{animation:wake .7s infinite}.swimmer.dive .sprite{animation:dive 1.6s ease-in-out}.destination{position:absolute;left:0;bottom:-5px;width:3px;height:47px;background:#fff3bb;box-shadow:0 0 14px #fff3bd;transform:translateX(-50%);z-index:2}.destination::before{content:'';position:absolute;width:10px;height:10px;border:2px solid #fff4bc;border-radius:50%;top:-13px;left:-5px;background:#315c53}.scene-status{position:absolute;bottom:37px;left:10%;right:10%;text-align:center;font-size:13px;line-height:1.5;color:#f7e7bd}.map-caption{position:absolute;bottom:12px;left:10px;right:10px;text-align:center;font-size:8px;color:#bed9cc}.river-fish{position:absolute;width:70px;aspect-ratio:1;background:url('assets/wilderness/animals.webp') 100% 0/300% 200%;opacity:.5;animation:fish 28s linear infinite;left:10%;top:28%}.fish-two{animation-delay:-12s;top:48%;width:48px;opacity:.4}.lesson{padding:23px;border:1px solid #d3dfbc40;border-radius:22px;background:linear-gradient(145deg,#204b43,#0e302f);box-shadow:0 12px 35px #031e2440}.lesson>.eyebrow{margin:0 0 10px}.lesson h2{font-size:32px;line-height:1.12;letter-spacing:-.025em;margin:0 0 12px;color:#fff1c4}.lesson>p:not(.eyebrow){font-size:13px;line-height:1.6;color:#dbe9dd}.models{display:grid;gap:15px;margin:20px 0}.model-label{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:11px;margin-bottom:7px;color:#d5e3d5}.model-label strong{font-size:19px;color:var(--gold);white-space:nowrap}.fraction-bar{display:grid;grid-template-columns:repeat(var(--pieces),1fr);height:31px;border:1px solid #c4dccc;border-radius:4px;overflow:hidden;background:#092c31}.fraction-bar i{border-right:1px dashed #c4dccc75}.fraction-bar i.original-edge{border-right:2px solid #dceade}.fraction-bar i:last-child{border:0}.fraction-bar i.filled{background:#e4bd6e}.fraction-bar.mint i.filled{background:#7bcab5}.fraction-bar.mint+.model-label strong{color:var(--mint)}.teaching{border-left:3px solid var(--gold);padding:10px 13px;background:#071f254d;border-radius:4px;font-size:13px;line-height:1.65;color:#edf2df;margin:17px 0}.teaching b{color:#ffe5a0}.lesson .primary{width:100%}#navigation label{display:flex;justify-content:space-between;align-items:center;font-size:9px;letter-spacing:.06em;margin-top:20px}#positionText{font-size:28px;color:#ffe3a2;letter-spacing:0}input[type=range]{display:block;width:100%;accent-color:var(--gold);height:36px;cursor:pointer;margin:8px 0}.steering{display:grid;grid-template-columns:1fr 1fr;gap:9px}.steering button{min-height:44px}.control-hint{font-size:10px;line-height:1.5;color:#bacfc3;margin:10px 0 14px}.feedback:empty{display:none}.feedback{font-size:13px;line-height:1.65;border:1px solid #f2c48e80;background:#66472955;border-radius:10px;padding:12px;margin-top:15px}.feedback.good{background:#2f66564d;border-color:#8bddb9}.lesson-tools{display:flex;justify-content:space-between;gap:10px;margin-top:10px}#next{margin-top:15px}.results{max-width:650px;margin:40px auto;padding:40px 30px;text-align:center;background:#133a34;border:1px solid #d4dfb844;border-radius:22px}.results h1{font-size:42px;letter-spacing:-.04em}.star{font-size:65px;color:var(--gold)}.result-stats{display:flex;justify-content:center;gap:40px}.result-stats strong{display:block;font-size:36px;color:var(--gold)}.result-stats span{font-size:11px}.results p{line-height:1.7;font-size:14px}.results>.primary,.results>.secondary{width:100%;margin:8px 0}.results>.text-button,.results>a{display:inline-block;margin:15px;font-size:12px}#review{text-align:left;font-size:13px}#review details{padding:12px;border-bottom:1px solid #b5d2b936}#review summary{cursor:pointer}footer{display:flex;justify-content:space-between;gap:15px;padding:28px 4vw;font-size:9px;letter-spacing:.08em;color:#bdd4c8}dialog{background:#133a34;color:#eff4e8;border:1px solid #d1dcb7;max-width:540px;width:92%;max-height:90dvh;padding:30px;overflow:auto}dialog::backdrop{background:#021d23df;backdrop-filter:blur(5px)}dialog h2{font-size:30px}dialog ol{padding-left:24px;font-size:14px;line-height:1.7}dialog li{padding:7px 0}dialog>.primary,dialog>.secondary{width:100%;margin:8px 0}.paused *{animation-play-state:paused!important}.calm-motion .river-light,.calm-motion .river-fish,.calm-motion .wake{animation:none}.calm-motion .swimmer.dive .sprite{animation:none}
@keyframes light{to{transform:translateX(8%)}}@keyframes wake{to{transform:scale(1.4);opacity:0}}@keyframes fish{0%{left:-15%;transform:scaleX(1)}49%{left:100%;transform:scaleX(1)}50%{left:100%;transform:scaleX(-1)}100%{left:-15%;transform:scaleX(-1)}}@keyframes dive{40%{transform:translateY(50px) scale(.7) rotate(18deg);opacity:.25}80%{transform:translateY(-15px);opacity:1}}
@media(min-width:1100px) and (min-height:850px){.river{min-height:640px}.travel-area{bottom:130px}.swimmer{width:270px;height:270px;bottom:-10px}}
@media(max-width:950px){.welcome{grid-template-columns:1fr;max-width:700px}.hero{min-height:430px;border-radius:22px 22px 0 0}.hero h1{font-size:64px}.hero-otter{width:60%;left:40%;bottom:-15%}.setup{border-radius:0 0 22px 22px}.expedition{grid-template-columns:minmax(0,1fr) 330px;gap:12px}.lesson{padding:20px}.river{min-height:555px}.scene-caption{left:15px;right:15px;top:18px;padding:13px}.scene-caption strong{font-size:13px}.travel-area{left:16%;right:16%}.swimmer{width:170px;height:170px;bottom:0}.river-labels{font-size:7px}.stats{gap:15px}}
@media(max-width:700px){.nav{padding:14px;gap:12px;font-size:10px}.brand{font-size:12px}.brand span{font-size:6px}.nav .quiet{font-size:10px;padding:10px}.welcome{padding:0 12px;margin:15px auto}.hero{min-height:430px;padding:28px}.hero h1{font-size:62px}.tagline{font-size:26px}.hero-otter{width:90%;left:12%;bottom:-19%}.setup{padding:25px 20px}.setup h2{font-size:35px}.levels button{padding:12px 8px}.levels strong{font-size:21px}.levels span{font-size:9px}#game{padding:0 12px;margin:17px auto}.game-head{align-items:flex-start}.game-head h2{font-size:18px;margin:0 0 15px}.stats{gap:12px}.stats small{font-size:6px}.stats b{font-size:20px}.stats .quiet{padding:9px;font-size:10px}.expedition{grid-template-columns:1fr}.river{min-height:280px}.scene-caption{top:12px;left:12px;right:auto;gap:5px;padding:10px 12px}.scene-caption span{font-size:7px}.scene-caption strong{font-size:12px}.travel-area{left:14%;right:14%;bottom:85px;height:100px}.swimmer{width:155px;height:155px;bottom:-6px}.distance-track{height:23px}.river-labels{font-size:8px}.destination{height:34px}.scene-status{bottom:29px;font-size:11px}.map-caption{bottom:8px;font-size:7px}.river-fish{width:45px;top:35%}.lesson{padding:21px}.lesson h2{font-size:29px}.models{margin:15px 0}.teaching{font-size:13px}.game-head .eyebrow{font-size:8px}.results{margin:20px 12px;padding:25px 20px}.results h1{font-size:34px}footer{font-size:7px;line-height:1.5}.calm span{font-size:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@media(min-width:701px) and (max-height:850px){
 .river{min-height:490px;position:sticky;top:12px;align-self:start;height:calc(100dvh - 205px)}.lesson{padding:17px 20px}.lesson>.eyebrow{font-size:9px;margin-bottom:7px}.lesson h2{font-size:27px;margin-bottom:9px}.lesson>p:not(.eyebrow){font-size:12px;line-height:1.45;margin:9px 0}.models{gap:10px;margin:13px 0}.model-label{font-size:10px;margin-bottom:5px}.model-label strong{font-size:17px}.fraction-bar{height:23px}.teaching{font-size:12px;line-height:1.5;padding:8px 10px;margin:12px 0}#navigation label{margin-top:12px}#positionText{font-size:24px}input[type=range]{height:26px;margin:6px 0}.steering button{min-height:37px;padding:9px}.control-hint{margin:7px 0 9px;font-size:9px}.lesson .primary{min-height:42px;padding:11px 14px;font-size:13px}.lesson-tools{margin-top:4px}.lesson-tools button{font-size:11px}.travel-area{bottom:100px}
}
@media(max-width:700px){.river{position:sticky;top:0;z-index:4;min-height:220px;max-height:220px}.scene-caption{padding:8px 10px;gap:4px}.scene-caption strong{font-size:11px}.travel-area{bottom:76px}.swimmer{width:130px;height:130px;bottom:-5px}.map-caption{font-size:6px}.scene-status{bottom:24px}.river-labels{font-size:7px}.lesson{position:relative}}