*{box-sizing:border-box}body{margin:0;background:linear-gradient(#d9f8f5,#effaff);color:#21495a;font-family:'Trebuchet MS',Arial,sans-serif}button{font:inherit;cursor:pointer;border:0}button:focus-visible,summary:focus-visible{outline:4px solid #705af0;outline-offset:4px}header{max-width:1250px;margin:auto;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:12px}header b{font-size:20px}header small{display:block;font-size:10px;letter-spacing:1.5px;margin-top:5px;color:#5b8590}.tools{display:flex;gap:9px}.tools button{width:40px;height:40px;border-radius:13px;background:#fff;box-shadow:0 4px #acd8dc;font-size:20px}main{max-width:1200px;margin:auto;padding:0 22px}.map-title{text-align:center;padding:14px 0}.map-title>span{font-size:11px;letter-spacing:2px;color:#5b929b;font-weight:bold}h1{font-size:clamp(29px,4vw,44px);margin:9px 0;color:#176c79;text-shadow:0 3px white;letter-spacing:-1px}.map-title p{margin:6px;color:#5e8b97;font-size:14px}.island-map{position:relative;aspect-ratio:16/9;border-radius:30px;overflow:hidden;background:#41c5d3 url('assets/island-map.jpg') center/cover;box-shadow:0 10px 0 #77bec8,0 20px 45px #31889628;border:4px solid #fff}.ocean-shine{position:absolute;inset:0;background:linear-gradient(110deg,transparent 25%,#ffffff15 40%,transparent 55%);background-size:200% 100%;animation:shine 9s linear infinite;pointer-events:none}.map-gates{position:absolute;inset:0}.gate{position:absolute;transform:translate(-50%,-50%);border:3px solid #fff5;border-radius:18px;padding:12px 21px;background:linear-gradient(#ffe49b,#eeba53);color:#624629;text-align:center;box-shadow:0 6px 0 #a57c3b,0 12px 20px #135c6d45;min-width:165px;transition:scale .2s}.gate:hover{scale:1.08}.gate b{display:block;font-size:17px}.gate small{display:block;font-size:12px;margin:4px 0}.gate .stars{font-size:12px;letter-spacing:1px}.gate:nth-child(2){background:linear-gradient(#ffdce8,#f3a6c1);box-shadow:0 6px #b86b86,0 12px 20px #135c6d45}.gate:nth-child(3){background:linear-gradient(#e7dcff,#bcb0ef);box-shadow:0 6px #8876b5,0 12px 20px #135c6d45}.gate:nth-child(4){background:linear-gradient(#d4f4bf,#a7d883);box-shadow:0 6px #78a75e,0 12px 20px #135c6d45}.boat{position:absolute;left:48%;bottom:13%;font-size:50px;filter:drop-shadow(3px 8px 4px #136b7140);animation:boat 4s ease-in-out infinite;pointer-events:none}.map-tip{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);white-space:nowrap;background:#ffffffdf;color:#277e89;border-radius:20px;padding:9px 17px;font-size:12px}.map-bottom{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:25px 5px 8px;font-size:15px}.map-bottom small{display:block;color:#71979e;font-size:12px;margin-top:5px}.gold{background:linear-gradient(#ffdf81,#ffc24e);color:#725021;border:2px solid #fff2;border-radius:15px;padding:14px 21px;font-weight:bold;box-shadow:0 5px 0 #c49031,0 8px 15px #af863e25}.gold:active{translate:0 3px;box-shadow:0 2px #c49031}.play-top{display:flex;justify-content:space-between;align-items:center;padding:12px 0;font-weight:bold}.play-top button{background:white;border-radius:13px;padding:10px 15px;color:#3b8090;box-shadow:0 4px #b8dfe0}.stage{position:relative;aspect-ratio:16/9;background:#7cdbef;border:4px solid white;border-radius:24px;overflow:hidden;box-shadow:0 8px #8ac7bf,0 20px 30px #246f6926}canvas{width:100%;height:100%;display:block}.question-board{position:absolute;left:13%;top:5%;width:74%;background:#fffdf1ed;border:3px solid white;border-radius:17px;box-shadow:0 5px #9cc6a46b;padding:13px 20px;color:#394b45;pointer-events:none}.question-board>div{display:flex;justify-content:space-between;font-size:10px;font-weight:bold;color:#77956e;gap:10px}.question-board h2{font-size:clamp(14px,2.1vw,25px);line-height:1.3;margin:9px 0 2px;text-align:center}.stage-badge{position:absolute;bottom:12px;right:16px;font-size:11px;color:#faffcf;text-shadow:0 2px #396f20;pointer-events:none}.controls{display:flex;align-items:center;justify-content:space-between;margin:17px 0 10px;gap:10px;user-select:none}.key-group{display:flex;gap:10px}.key{width:68px;height:59px;border-radius:17px;background:linear-gradient(#92daf5,#5ab3df);color:white;font-size:25px;box-shadow:0 5px #3485b1;border:3px solid #cdefff;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.key:active,.key.pressed{translate:0 3px;box-shadow:0 2px #3485b1}.jump{width:125px;background:linear-gradient(#ffe89d,#ffd068);border-color:#fff0bc;box-shadow:0 5px #c4933a}.jump span{font-size:12px;vertical-align:middle;color:#885f28}.controls p{text-align:center;color:#608b96;font-size:12px;line-height:1.8;margin:0}.controls small{font-size:10px}.access{font-size:12px;color:#7b969d;background:#ffffff85;padding:12px 15px;border-radius:15px}.access summary{cursor:pointer}.access div{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.access button{background:#fff;border-radius:10px;color:#365a6b;padding:10px 15px;border:1px solid #b3d6de}#feedback{position:absolute;left:17%;top:28%;width:66%;border:4px solid white;border-radius:23px;padding:19px 25px;background:#fffdf3f7;box-shadow:0 10px 0 #43735b4d,0 20px 50px #153e4040;text-align:center}#feedback strong{font-size:clamp(15px,2vw,24px);color:#237b66}#feedback p{font-size:clamp(12px,1.5vw,16px);line-height:1.5;margin:10px 0}#explain-zh{color:#7e8066}#feedback button{padding:10px 19px;margin-top:4px}.loading{position:absolute;inset:0;display:grid;place-content:center;text-align:center;background:#24a6b6e8;color:white;font-weight:bold;font-size:24px;line-height:2}.intro{position:fixed;inset:0;background:#143e5a80;display:grid;place-items:center;z-index:20;padding:20px;backdrop-filter:blur(5px)}.intro>div{background:#fffdf1;border:5px solid white;padding:27px 35px;border-radius:30px;text-align:center;box-shadow:0 14px 0 #31585a50;max-width:480px}.intro h2{margin:12px 0}.intro p{line-height:1.8;font-size:15px}.intro .small{font-size:12px;color:#819094}#result{max-width:750px;margin:35px auto;text-align:center;background:#fffdf1;border:5px solid white;padding:35px;border-radius:30px;box-shadow:0 10px #a1d8ce}#result .big{font-size:75px}#result .score{font-size:60px;font-weight:bold;color:#248c8a;margin:14px}#result p{line-height:1.8}.result-actions{display:flex;flex-wrap:wrap;gap:15px;justify-content:center;margin:25px 0}footer{text-align:center;color:#7b9ea5;font-size:11px;padding:25px 15px}[hidden]{display:none!important}@keyframes boat{50%{translate:12px -8px;rotate:4deg}}@keyframes shine{to{background-position:-200% 0}}@media(max-width:650px){header{padding:14px 12px}header b{font-size:15px}header small{font-size:8px}.tools{gap:5px}.tools button{width:31px;height:32px;font-size:17px}main{padding:0 10px}.island-map{aspect-ratio:4/3;border-radius:22px;background-size:cover}.gate{min-width:120px;padding:8px 10px;border-radius:13px}.gate b{font-size:12px}.gate small,.gate .stars{font-size:10px}.boat{font-size:32px}.map-tip{font-size:9px;padding:7px 10px}.map-bottom{flex-direction:column;text-align:center;padding-top:20px}.map-bottom .gold{font-size:13px}.stage{border-width:2px;border-radius:16px}.question-board{padding:7px 10px;top:3%;border-width:2px;left:6%;width:88%;border-radius:10px}.question-board>div{font-size:7px}.question-board h2{font-size:13px;margin:5px 0}.play-top{font-size:12px}.play-top button{font-size:11px}.key{width:51px;height:49px;font-size:20px;border-radius:13px}.jump{width:98px}.controls p{font-size:9px}.controls small{display:none}.key-group{gap:6px}#feedback{left:7%;width:86%;padding:9px 12px;top:22%;border-width:2px;border-radius:14px}#feedback p{font-size:11px;margin:5px 0}#feedback strong{font-size:13px}#feedback button{font-size:11px;padding:7px 13px}.stage-badge{font-size:7px;bottom:6px}.map-title{padding-top:5px}.map-title h1{font-size:27px}.map-title p{font-size:12px}}@media(max-height:500px) and (orientation:landscape){header{padding:8px 15px}main{max-width:850px}.map-title{display:none}.island-map{max-height:70vh}.stage{max-width:710px;margin:auto}.controls{max-width:710px;margin:12px auto}.access{max-width:710px;margin:auto}footer{padding:12px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}body.calm *{animation:none!important;transition:none!important}
.island-map{background:linear-gradient(#ccf3ff,#5bd3df);aspect-ratio:16/10}#routecanvas{position:absolute;inset:0;width:100%;height:100%;touch-action:pan-y;cursor:grab}.route-status{position:absolute;top:15px;left:15px;background:#ffffffdf;box-shadow:0 4px #24799325;border-radius:17px;padding:10px 16px;font-size:12px;max-width:65%;pointer-events:none}.camera-controls{position:absolute;top:13px;right:13px;display:flex;gap:6px}.camera-controls button{border-radius:10px;width:34px;height:34px;background:#ffffffe5;box-shadow:0 4px #29758235;color:#40778d;font-size:21px}.stop{position:absolute;transform:translate(-50%,-50%);width:31px;height:31px;border-radius:50%;border:3px solid white;background:#ffc85e;color:#734c24;font-weight:bold;font-size:11px;box-shadow:0 4px #ad793b,0 6px 12px #19566440}.stop.done{background:#a4eab0;color:#1e6947;box-shadow:0 4px #6fa883}.stop.current{outline:3px solid #ffe394;outline-offset:3px}.stop:disabled{cursor:wait}.map-gates.walking{pointer-events:none}#theme-menu{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:25px}.theme-link{background:#fff;border:2px solid #d4edf0;border-radius:15px;text-align:left;padding:12px 15px;color:#43616c;box-shadow:0 4px #bcdde2}.theme-link strong{display:block;font-size:13px}.theme-link small{display:block;color:#8a9fa3;font-size:10px;margin-top:4px}.theme-link.done{border-color:#a6d6b1}.map-tip{font-size:11px}.map-title p{font-size:13px}.map-bottom{padding-top:20px}.next-route{background:linear-gradient(#c0eccc,#90d3b0);box-shadow:0 5px #62a38b;color:#2d654c}.result-map-stats{color:#629197;font-size:13px}@media(max-width:650px){.island-map{aspect-ratio:4/3}#theme-menu{grid-template-columns:repeat(2,1fr);gap:7px;margin-top:20px}.theme-link{padding:10px}.theme-link strong{font-size:12px}.route-status{font-size:9px;padding:8px 10px;max-width:60%;top:10px;left:8px}.map-tip{font-size:8px;padding:7px}.camera-controls{right:8px;top:8px}.camera-controls button{width:27px;height:28px;font-size:17px}.stop{width:26px;height:26px;border-width:2px;font-size:10px}}
.flat-map{background:#40becc url('assets/island-map.jpg') center/cover}.flat-map #gates{display:grid;grid-template-columns:repeat(4,1fr);place-items:center;padding:50px 25px 40px}.flat-map .stop{position:static;transform:none;width:40px;height:40px}.flat-map .camera-controls{display:none}
.island-map{aspect-ratio:16/9;background:transparent;--scene-zoom:1}.island-map:before{content:'';position:absolute;inset:0;background:#42bfc9 url('assets/island-map.jpg') center/100% 100%;transform:scale(var(--scene-zoom));transform-origin:center;pointer-events:none}.ocean-shine{z-index:1;opacity:.4;pointer-events:none}#routecanvas{z-index:2;cursor:default}.map-gates{z-index:3;pointer-events:none}.map-gates .stop{pointer-events:auto}.map-gates.walking .stop{pointer-events:none}.route-status,.camera-controls,.map-tip{z-index:4}.stop{width:27px;height:27px;font-size:10px;border-width:2px;opacity:.92}.stop.current{outline-width:2px;outline-offset:2px}.map-title h1{color:#197c87}@media(max-width:650px){.island-map{aspect-ratio:16/9}.stop{width:20px;height:20px;font-size:8px;border-width:1px}.route-status{font-size:8px}.camera-controls button{width:23px;height:25px;font-size:14px}.map-tip{font-size:7px;bottom:7px}.map-title p{font-size:12px}}
#student-entry{max-width:760px;margin:16px auto 35px;background:#fffdf5ed;border:4px solid white;border-radius:30px;padding:28px;box-shadow:0 10px #a3d7d0,0 20px 45px #24747b20;text-align:center}.entry-icon{font-size:45px}#student-entry h1{font-size:30px;margin:10px 0}#student-entry p{color:#69909b;font-size:14px}.entry-fields{display:grid;grid-template-columns:1fr 1fr;gap:18px;text-align:left;margin:25px 0}.entry-fields label{font-size:13px;font-weight:bold;color:#4b7885}.entry-fields input{display:block;width:100%;padding:13px 15px;border:2px solid #c9e5e7;border-radius:14px;margin-top:8px;font:inherit;background:white;color:#325d6d}.entry-fields input:focus{outline:3px solid #ffe3a0;border-color:#88cfc4}#student-entry h2{font-size:17px}.role-choices{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:18px 0 26px}.role-card{position:relative;background:#edf8f5;border:3px solid #d6e9e3;border-radius:21px;padding:12px;cursor:pointer;transition:translate .2s}.role-card:has(input:checked){border-color:#e5b654;background:#fff4cf;box-shadow:0 5px #d6b56c}.role-card input{position:absolute;left:12px;top:12px;accent-color:#ad852c}.role-card img{height:160px;max-width:100%;object-fit:contain;display:block;margin:auto}.role-card strong{display:block;font-size:12px;color:#547376;margin-top:10px}.role-card small{display:block;font-size:11px;color:#7c9994;margin:4px}.entry-note{font-size:10px!important;line-height:1.7;margin-top:24px}#studentbadge{font-size:11px;color:#477881;padding:5px 8px;background:#fff8;border-radius:12px}#celebration{position:fixed;inset:0;width:100%;height:100%;z-index:40;pointer-events:none}.syabas{font-size:clamp(18px,3vw,27px);line-height:1.5;color:#258e79;font-weight:bold}.final-badge{display:inline-block;padding:10px 20px;border-radius:18px;background:#e1f4de;color:#47885a;font-weight:bold}#result-student{font-weight:bold;color:#638ea0}@media(max-width:650px){#student-entry{padding:20px 13px;margin-top:8px}#student-entry h1{font-size:24px}.entry-fields{grid-template-columns:1fr;gap:12px}.role-choices{gap:8px}.role-card{padding:8px 4px}.role-card img{height:120px}.role-card strong{font-size:10px}.role-card small{font-size:9px}#studentbadge{max-width:85px;font-size:9px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}
/* Keep the island artwork in an explicit image element, independently of CSS background loading. */
.island-map:before{content:none!important}#island-backdrop{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:fill;z-index:0;transform:scale(var(--scene-zoom,1));transform-origin:center;pointer-events:none}.island-map{background:#46c5d3}

.teacher-link{text-align:center;padding:16px;font-size:14px}.teacher-link a{color:#245e65}.sync-status{font-size:14px!important;line-height:1.6;color:#245e65;background:#f3fbf3;border-radius:12px;padding:8px 12px;max-width:680px;margin:12px auto}.sync-status:empty{display:none}
/* Phone layout: readable questions, direct answer buttons and touch controls. */
.map-viewport{border-radius:30px}.mobile-map-hint{display:none}
@media(max-width:700px){
 body{overflow-x:hidden}header{flex-wrap:wrap;padding:12px max(12px,env(safe-area-inset-left));gap:10px}header>div:first-child{flex:1 0 100%}header b{font-size:18px}.tools{width:100%;gap:9px;align-items:center;justify-content:flex-end}.tools button{width:44px;height:44px;font-size:21px}#studentbadge{margin-right:auto;max-width:45%;font-size:13px;padding:8px;white-space:normal;overflow-wrap:anywhere}main{padding:0 max(12px,env(safe-area-inset-left))}.entry-fields input{font-size:16px;min-height:48px}.entry-fields label{font-size:14px}#student-entry .gold{min-height:52px;width:100%;font-size:16px}.role-card{padding:15px 3px 10px;min-width:0}.role-card input{width:20px;height:20px;top:8px;left:8px}.role-card img{height:108px}.role-card strong{font-size:11px;overflow-wrap:anywhere}.entry-note{font-size:12px!important}
 .mobile-map-hint{display:block;text-align:center;font-size:12px;color:#3b7e88}.map-viewport{overflow-x:auto;overflow-y:hidden;border-radius:20px;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;padding-bottom:12px}.island-map{width:720px;max-width:none;aspect-ratio:16/9;border-radius:20px}.stop{width:32px;height:32px;font-size:12px;border-width:2px}.route-status{font-size:12px;top:12px;left:12px;max-width:60%}.camera-controls button{width:44px;height:44px;font-size:23px}.map-tip{font-size:11px;padding:9px;bottom:12px}.theme-link{min-height:64px}.theme-link strong{font-size:14px}.theme-link small{font-size:12px}.map-bottom .gold{width:100%;min-height:48px;font-size:15px}
 .play-top{gap:9px;flex-wrap:wrap;font-size:13px}.play-top button{min-height:44px;font-size:13px}#levelname{flex:1;line-height:1.5}.stage{display:flex;flex-direction:column;aspect-ratio:auto;overflow:visible;border-radius:18px;background:#e9f8f7}.stage #gamecanvas{width:100%;height:auto;aspect-ratio:16/9;border-radius:0 0 14px 14px}.question-board{position:static;order:-1;left:auto;top:auto;width:100%;padding:14px;border-radius:16px 16px 0 0;box-shadow:none;pointer-events:auto}.question-board>div{font-size:10px}.question-board>div>span:last-child{display:none}.question-board h2{font-size:19px;line-height:1.5;margin:9px 0 0;overflow-wrap:anywhere}.stage-badge{display:none}#feedback{position:static;left:auto;top:auto;width:100%;margin:0;border:0;border-radius:0 0 14px 14px;padding:16px;background:#fffdf3;box-shadow:none}#feedback strong{font-size:18px}#feedback p{font-size:15px;line-height:1.65;margin:10px 0}#feedback button{width:100%;min-height:48px;font-size:16px;padding:12px}.controls{position:sticky;bottom:0;z-index:10;background:#effafaf5;border-radius:16px;padding:10px 8px calc(10px + env(safe-area-inset-bottom));margin:12px 0;box-shadow:0 -4px 18px #286e6b15;gap:8px}.key{width:58px;height:56px;font-size:25px}.jump{width:120px}.jump span{font-size:13px}.controls p{display:none}.access{font-size:14px;padding:14px;background:#fffdf5}.access summary{min-height:35px;line-height:1.5}.access div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.access button{min-height:52px;font-size:16px;line-height:1.4;padding:12px 8px;overflow-wrap:anywhere}.access button:disabled{opacity:.55}.intro{padding:12px}.intro>div{max-height:90dvh;overflow:auto;padding:22px 18px}.intro p{font-size:14px}.intro .gold{min-height:48px;width:100%}#result{margin:18px auto;padding:22px 16px}#result .big{font-size:56px}#result .score{font-size:48px}.result-actions{flex-direction:column;gap:13px}.result-actions button{width:100%;min-height:50px;font-size:16px}.teacher-link a{display:inline-flex;align-items:center;min-height:44px}.sync-status{font-size:13px!important}
}
@media(max-height:500px) and (orientation:landscape){header{padding:6px 12px}.tools button{width:40px;height:40px}.intro>div{max-height:90dvh;overflow:auto}.controls{position:static}.question-board h2{font-size:17px}.stage{max-width:710px}.island-map{max-height:none}}

.mobile-platform-guide{display:none}
@media(max-width:700px){.mobile-platform-guide{display:block;background:#fffdf5;border-radius:14px;padding:12px 14px;margin-top:12px;color:#486576}.mobile-platform-guide p{margin:0 0 9px;font-size:12px}.mobile-platform-guide ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 28px;margin:0;padding-left:24px}.mobile-platform-guide li{font-size:16px;line-height:1.5;overflow-wrap:anywhere;padding-left:3px}.mobile-platform-guide li::marker{font-weight:bold;color:#91672d}}