:root{font-family:ui-rounded,SF Pro Rounded,system-ui,-apple-system,Microsoft YaHei,sans-serif;color:#284b3c;background:#f7f6ef;font-synthesis:none;line-height:1.6}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at top left,#e6eedc,transparent 50%),#f7f6ef}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer;border:0;padding:11px 16px;border-radius:12px;background:#eaf0e2;color:#315341;font-weight:700}button:hover{filter:brightness(.97)}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #d79a3e;outline-offset:4px}a{color:#315e49;text-underline-offset:3px}input,textarea,select{font-size:16px;max-width:100%;border:1px solid #cdd9c5;border-radius:10px;padding:10px;background:#fffdf9;color:#284b3c}select{padding:9px}textarea{width:100%;min-height:120px;resize:vertical}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(32px,4vw,52px);line-height:1.13;letter-spacing:-1.8px}h2{font-size:25px;letter-spacing:-.7px}h3{font-size:19px;line-height:1.3}p{color:#60715f}.site-header{position:relative;z-index:10;display:flex;align-items:center;justify-content:space-between;max-width:1320px;margin:auto;padding:22px 32px;gap:20px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-size:24px;font-weight:850;letter-spacing:-1px}.brand img{border-radius:12px}.brand-light{font-weight:450}.brand small{display:block;font-size:10px;letter-spacing:1.4px;text-transform:uppercase;color:#6a7d5c}nav{display:flex;align-items:center;gap:7px;flex-wrap:wrap}nav button{background:transparent;font-size:13px}.primary{background:#39765b;color:#fff;box-shadow:0 3px #285440}main{max-width:1220px;margin:0 auto;padding:20px 28px 60px;min-height:70vh}.eyebrow{display:block;text-transform:uppercase;font-size:11px;font-weight:800;letter-spacing:2px;color:#7a875c;margin-bottom:14px}.hero{display:grid;grid-template-columns:1.2fr .8fr;align-items:center;gap:20px;padding:40px 44px;background:#eaf0df;border:1px solid #dce5ce;border-radius:30px;position:relative;overflow:hidden}.hero p{max-width:520px}.hero-art{display:flex;align-items:center;justify-content:center;position:relative;min-height:250px}.hero-art img{width:245px;max-width:100%;border-radius:50%;transform:rotate(-5deg);box-shadow:20px 20px #d6e4c6}.hero-orbit{position:absolute;left:15%;top:8%;background:#fff9ed;border:1px solid #e5d7b4;border-radius:18px;padding:10px 18px;transform:rotate(-9deg);font-weight:800;color:#b47738}.hero-orbit:last-child{inset:auto 7% 12% auto;transform:rotate(9deg);color:#886c9d}.hero-links{display:flex;gap:10px;flex-wrap:wrap}.section-top{display:flex;justify-content:space-between;gap:16px;align-items:end;margin:36px 0 16px}.section-top h2{margin:0}.muted,.small{font-size:13px;color:#71806b}.filters{display:flex;gap:12px;align-items:end;flex-wrap:wrap}.filters label{display:grid;gap:4px;font-size:12px;font-weight:700}.year-tabs{display:flex;gap:10px;margin:20px 0;flex-wrap:wrap}.year-tabs button{min-width:80px;padding:15px 22px;background:#fffdf8;border:1px solid #e1e5d6}.year-tabs button[aria-pressed=true]{background:#39765b;color:#fff;border-color:#39765b;box-shadow:0 3px #285440}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.subject{display:flex;flex-direction:column;gap:12px;text-align:left;background:#fffdf8;border:1px solid #e0e5d7;padding:23px;border-radius:22px;box-shadow:0 5px #e4e7da;min-height:215px;transition:transform .2s}.subject:hover{transform:translateY(-3px)}.subject-icon{display:grid;place-items:center;width:51px;height:51px;background:color-mix(in srgb,var(--accent) 13%,#fff);border-radius:15px;font-size:25px;color:var(--accent)}.subject h3{margin:0}.subject small{font-size:12px;font-weight:500;color:#74816c}.subject-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#65765f}.chip{font-size:11px;background:#edf2e3;border-radius:20px;padding:5px 10px;display:inline-block;font-weight:700}.review-note{border-left:3px solid #d3af69;padding:12px 16px;background:#fcf5e5;border-radius:0 12px 12px 0;font-size:13px;color:#786138;margin:20px 0}.panel{background:#fffdf8;border:1px solid #e0e5d7;border-radius:24px;padding:26px;margin:20px 0}.course-head{display:flex;gap:20px;align-items:center;margin:20px 0}.course-head .subject-icon{width:78px;height:78px;font-size:36px}.course-head h1{font-size:36px;margin:0}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic-card{padding:23px;background:#fffdf8;border:1px solid #e0e5d7;border-radius:21px;display:flex;flex-direction:column}.topic-card p{font-size:14px;flex:1}.topic-card button{align-self:start}.back{margin-bottom:12px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.attempt-list{display:grid;gap:9px}.attempt-row{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:16px;background:#f0f3e8;border-radius:13px}.question{padding:24px;background:#fffdf8;border:1px solid #e0e5d7;border-radius:22px;margin:16px 0}.q-heading{display:flex;align-items:start;gap:13px}.q-heading b{display:grid;place-items:center;flex:none;width:34px;height:34px;background:#e8efdf;border-radius:10px;font-size:13px}.question h2{font-size:18px;line-height:1.6;letter-spacing:0;white-space:pre-wrap}.passage{background:#f0f3e7;border-left:3px solid #8aa475;padding:20px;border-radius:0 12px 12px 0;margin-bottom:20px;white-space:pre-wrap;font-size:18px;line-height:1.9}.options{border:0;margin:0;padding:0;display:grid;gap:9px}.option{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#f6f6ee;border:1px solid #e0e5d7;border-radius:12px;cursor:pointer}.option:has(input:checked){background:#e3eddb;border-color:#729464}.option input{accent-color:#39765b;width:20px;height:20px;flex:none}.answer-label{display:block;margin:12px 0 6px;font-size:13px;font-weight:700}.question input[type=text]{width:min(350px,100%)}.drawing{width:100%;height:220px;display:block;background:repeating-linear-gradient(0deg,#fff 0 31px,#eaf0e8 32px);border:1px dashed #b5c8a9;border-radius:14px;touch-action:none;margin-top:12px}.draw-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;margin:9px 0}.draw-controls input{width:95px;padding:0}.draw-controls button{font-size:12px;padding:7px 10px}.result{background:#edf4e5;border-radius:12px;padding:15px;margin-top:16px;font-size:14px}.result.wrong{background:#fcf0e7}.result.pending{background:#f8f0da}.result p{margin:5px 0 0}.sticky-actions{position:sticky;bottom:env(safe-area-inset-bottom);display:flex;justify-content:space-between;align-items:center;gap:12px;background:#fffdf8f2;border:1px solid #dce5ce;border-radius:17px;padding:15px;backdrop-filter:blur(12px);z-index:5;box-shadow:0 0 20px #34572c12}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.stat{padding:22px;background:#edf2e3;border-radius:18px}.stat strong{display:block;font-size:32px}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:left;padding:13px;border-bottom:1px solid #e0e5d7}th{white-space:nowrap;background:#eff3e7}td:first-child{min-width:180px}.source-list{font-size:13px;line-height:1.9}.room-stage{height:510px!important;min-height:350px!important}.portal-room{overflow:hidden;border-radius:24px;background:#eaf2e7;border:1px solid #dce5ce;margin:20px 0}.portal-room>p{padding:0 20px;font-size:12px}.empty{padding:45px 25px;text-align:center;border:1px dashed #cbd8bd;border-radius:22px}.meter{height:5px;border-radius:10px;background:#e3e8d8;overflow:hidden;margin-top:8px}.meter span{display:block;height:100%;background:#6c9561}footer{max-width:1220px;margin:auto;padding:25px 28px calc(30px + env(safe-area-inset-bottom));border-top:1px solid #dfe6d5;color:#728068;font-size:12px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}dialog{width:min(490px,calc(100% - 30px));max-height:90dvh;overflow:auto;border:1px solid #dce5ce;border-radius:24px;padding:28px;background:#fffdf8;color:#284b3c}dialog::backdrop{background:#273e4266;backdrop-filter:blur(5px)}dialog form{display:grid;gap:12px}dialog label{font-size:13px}dialog input{width:100%;margin-top:5px}.error{color:#a54032;font-size:13px}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#315b46;color:#fff;border-radius:15px;padding:12px 20px;z-index:30;pointer-events:none;display:none;max-width:90vw}#toast.visible{display:block}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.skip{position:absolute;top:-80px;left:15px;background:#fff;padding:12px;z-index:50}.skip:focus{top:10px}.check-label{display:flex!important;align-items:center;gap:8px!important}.check-label input{width:18px;height:18px;accent-color:#39765b}.preview-banner{font-size:12px;color:#7d6f4a;margin-top:12px}.doc-link{display:inline-block;margin-right:15px}body[data-motion=off] *{transition:none!important;animation:none!important}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}@media(max-width:800px){.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-header{padding:18px 20px}.hero{padding:30px;grid-template-columns:1.3fr .7fr}.hero-art img{width:180px}.hero-art{min-height:190px}.hero-orbit{display:none}.section-top{align-items:start;flex-direction:column}.room-stage{height:430px!important}}@media(max-width:520px){main{padding:10px 16px 40px}.site-header{padding:15px 16px;gap:12px}nav{width:100%;gap:2px}nav button{padding:9px 8px;font-size:12px}.hero{padding:26px;grid-template-columns:1fr}.hero-art{display:none}.subject-grid{gap:12px}.subject{padding:17px;min-height:205px}.subject h3{font-size:17px}.subject-foot{align-items:start;gap:5px;flex-direction:column}.year-tabs{gap:7px}.year-tabs button{min-width:0;flex:1;padding:12px 9px}.filters{gap:9px}.topic-grid{grid-template-columns:1fr}.course-head h1{font-size:28px}.course-head .subject-icon{width:55px;height:55px;font-size:26px}.question{padding:18px}.stats{gap:8px}.stat{padding:14px;font-size:12px}.stat strong{font-size:25px}.sticky-actions{flex-wrap:wrap}.room-stage{height:380px!important}.attempt-row{align-items:start}.panel{padding:20px}footer{padding:20px 16px}.brand{font-size:22px}}.button-link{display:inline-block;padding:10px 16px;background:#e7eedc;border-radius:12px;font-weight:700;text-decoration:none}button[aria-pressed=true]:not(.year-tabs button){box-shadow:inset 0 0 0 2px #39765b}nav button[aria-current=page]{background:#e7eedc}summary{cursor:pointer;font-weight:650}dialog button{margin-top:5px}.room-stage{position:relative;width:100%;overflow:hidden;touch-action:none}.room-stage canvas{width:100%;height:100%;display:block}.classroom-settings{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:0 0 20px}.classroom-settings .year-tabs{margin:0}.classroom-settings .year-tabs button{padding:11px 18px}.classroom-settings .filters{align-items:center}.learning-classroom .room-stage{height:560px!important;min-height:350px!important}.learning-classroom .room-pin[hidden]{display:none}.classroom-gestures{padding:12px 20px;margin:0;font-size:12px;text-align:center}.room-subject-pages{display:grid;gap:9px;margin-top:auto;padding-top:20px}.room-subject-pages button{font-size:12px;padding:9px 12px}.room-stage[data-unavailable=true] .room-loading{pointer-events:auto;padding:24px}.room-stage[data-unavailable=true] .room-loading p{max-width:360px}.learning-classroom .room-loading{padding:20px}.learning-classroom .station-menu{min-width:0}@media(max-width:780px){.classroom-settings{gap:14px}.classroom-settings .year-tabs{width:100%}.classroom-settings .year-tabs button{flex:1;min-width:0;padding:10px 8px}.learning-classroom .room-stage{height:440px!important}.room-subject-pages{grid-template-columns:1fr auto;align-items:center}.learning-classroom .station-choice:last-child{grid-column:auto}.classroom-heading>button{font-size:12px;flex-shrink:0}}@media(max-width:480px){.learning-classroom .room-stage{height:350px!important}.classroom-heading{align-items:start;gap:8px}.classroom-heading>button{padding:8px}.classroom-heading h1{font-size:26px}.classroom-gestures{font-size:10px;padding:10px}.classroom-settings .year-tabs{gap:5px}}.world-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 18px}.world-heading h1{font-size:clamp(23px,2.5vw,34px);margin:0}.world-heading .eyebrow{margin-bottom:7px}.world-heading .filters{font-size:12px}.world-shell{grid-template-columns:minmax(0,1fr) 275px}.world-shell .room-main{min-width:0;align-self:start}.world-shell .room-stage{height:580px!important}.world-controls{position:absolute;top:14px;left:16px;right:16px;z-index:6;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;pointer-events:none}.world-controls>*{pointer-events:auto}.class-doors{display:flex;align-items:center;gap:5px;background:#fff9e8ed;border:1px solid #e0d5b9;padding:6px 9px;border-radius:14px;box-shadow:0 4px #cabd9f44}.class-doors>span{font-size:11px;font-weight:800;margin-right:4px}.class-doors button{padding:7px 10px;min-width:33px;border-radius:9px;font-size:12px;background:#eee8d4}.class-doors button[aria-pressed=true]{background:#3e7d60;color:#fff}.world-breadcrumbs{display:flex;align-items:center;gap:6px;background:#fffaf0ed;border:1px solid #e6dfcb;border-radius:11px;padding:5px 8px;font-size:10px;max-width:100%;flex-wrap:wrap}.world-breadcrumbs button{font-size:10px;background:transparent;padding:3px 6px}.world-score{display:grid;grid-template-columns:1fr 1fr 1.35fr;gap:9px;padding:12px 16px;background:#e0ead7;border-top:1px solid #cbd8bb}.score-board,.award-shelf{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:#fff9e7;border:1px solid #d9ca9f;border-radius:13px;padding:11px 7px;box-shadow:0 3px #b4ad8755;font-size:10px;text-align:center}.score-board strong{font-size:25px;line-height:1.2;color:#477455}.score-board strong small{font-size:14px;color:#8b9b78}.score-board>small,.award-shelf>small{font-size:9px;color:#798169;font-weight:500}.shelf-stars{display:flex;gap:8px;align-items:center;justify-content:center;font-size:23px;min-height:31px}.shelf-stars .locked{filter:grayscale(1);opacity:.3}.world-shell .room-play-hud{position:relative;inset:auto;padding:6px 12px 14px;background:#edf3e5}.world-shell .room-play-panel{bottom:calc(100% + 5px)}.world-shell .classroom-gestures{background:#edf3e5;padding:7px 16px}.world-shell .station-menu[hidden],.classroom-desk[hidden]{display:none}.world-shell.desk-open{grid-template-columns:minmax(0,1fr) minmax(390px,46%)}.classroom-desk{background:#f4ead5;border-left:5px solid #d3b785;min-width:0;box-shadow:inset 8px 0 15px #b3904d12}.desk-bar{display:flex;justify-content:space-between;align-items:center;padding:12px 17px;border-bottom:1px solid #d8c7a7;font-size:12px;font-weight:800;color:#8c734e}.desk-bar button{padding:7px 11px;background:#eee0c4}.classroom-desk #deskContent{padding:20px;max-height:720px;overflow-y:auto;overscroll-behavior:contain;background:linear-gradient(90deg,#f7efdf 0 18px,#fffaf0 18px);scrollbar-width:thin}.classroom-desk h1{font-size:27px;letter-spacing:-.7px}.classroom-desk h2{font-size:20px}.classroom-desk .section-top{margin:12px 0}.classroom-desk .question{padding:17px}.classroom-desk .question h2{font-size:16px}.classroom-desk .panel{padding:16px}.classroom-desk .sticky-actions{bottom:0;padding:10px;font-size:12px}.classroom-desk .stats{gap:8px}.classroom-desk .stat{padding:12px;font-size:11px}.classroom-desk .stat strong{font-size:25px}.classroom-desk .table-scroll{padding:0}.world-footnote{font-size:11px;text-align:center;margin:15px 0;color:#839078}.award-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.award-card{border:1px solid #ddcd9c;background:#fff8de;border-radius:20px;padding:20px 15px;text-align:center;box-shadow:0 5px #d9c89e66}.award-card.locked{background:#f0eee5;border-color:#d9d8cd}.award-card.locked .award-icon{filter:grayscale(1);opacity:.35}.award-icon{display:block;font-size:40px}.award-card h2{font-size:18px;margin:10px 0}.award-card p{font-size:12px}.world-shell .room-pin[hidden]{display:none}@media(max-width:1000px){.world-shell.desk-open{grid-template-columns:minmax(0,1fr) minmax(350px,49%)}.world-shell.desk-open .room-stage{height:530px!important}.world-shell.desk-open .world-breadcrumbs{display:none}.world-score{padding:10px;gap:6px}.score-board,.award-shelf{font-size:9px}.shelf-stars{font-size:18px;gap:4px}}@media(max-width:780px){.world-heading{align-items:start;flex-wrap:wrap;gap:12px}.world-shell,.world-shell.desk-open{grid-template-columns:1fr}.world-shell .room-stage{height:440px!important}.world-shell.desk-open .room-stage{height:280px!important;min-height:220px!important}.world-shell.desk-open .world-score{padding:7px}.world-shell.desk-open .score-board,.world-shell.desk-open .award-shelf{padding:5px}.world-shell.desk-open .score-board strong{font-size:20px}.world-shell.desk-open .room-play-hud{padding:5px 10px}.world-shell.desk-open .room-play-hud>span,.world-shell.desk-open .classroom-gestures{display:none}.classroom-desk{border-left:0;border-top:5px solid #d3b785}.classroom-desk #deskContent{max-height:65svh;padding:16px}.world-controls{top:10px;left:10px;right:10px}.world-heading .filters{gap:9px}.world-shell .station-choices{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:480px){.world-shell .room-stage{height:370px!important}.world-heading .filters{width:100%;justify-content:space-between}.world-heading h1{font-size:23px}.world-controls{gap:7px}.world-breadcrumbs{font-size:9px}.class-doors button{min-width:30px;padding:6px 9px}.class-doors>span{font-size:10px}.world-score{gap:5px;padding:9px}.score-board strong{font-size:22px}.score-board>small{font-size:8px}.shelf-stars{font-size:19px;gap:4px}.award-shelf>span:first-child{font-size:9px}.world-footnote{font-size:10px}.world-shell.desk-open .room-pin span{display:none}.award-grid{gap:9px}.award-card{padding:14px 10px}}.voice-caption{position:fixed;bottom:20px;left:20px;max-width:min(440px,calc(100vw - 40px));padding:14px 18px;border:2px solid white;border-radius:18px;background:#fff6dcf5;box-shadow:0 4px 20px #4d654a25;color:#82683e;font-size:13px;z-index:25;pointer-events:none}.voice-caption[hidden]{display:none}.room-theme-name{display:inline-flex;align-items:center;margin-top:9px;font-size:12px;color:#7b876f;font-weight:650}.world-shell .room-main{background:radial-gradient(ellipse at 50% 45%,#fffff3,var(--room-background,#e8f2e9) 75%)}.world-shell .class-doors button[aria-pressed=true]{background:var(--room-accent,#39765b)}.world-shell .world-score{background:var(--room-background,#e0ead7)}.world-shell[data-year-theme=space-station] .room-main:before{background-image:radial-gradient(#fff 1.4px,transparent 1.5px);background-size:26px 26px}.world-shell[data-year-theme=inventor-workshop] .room-main:before{background-image:linear-gradient(#719eab14 1px,transparent 1px),linear-gradient(90deg,#719eab14 1px,transparent 1px);background-size:22px 22px}[data-transitioning=true] .room-pin,[data-transitioning=true] .room-star-pin,[data-transitioning=true] .milo-play-pin{opacity:0;pointer-events:none}.room-pin{transition:opacity .15s ease}.school-badge{padding:10px 14px;border-radius:14px;background:#edf2e7;color:#52745c;font-size:12px;font-weight:700;white-space:nowrap}.station-menu .station-instruction{font-size:14px;margin:0 0 8px;color:#71816b}.fraction{display:inline-flex;flex-direction:column;vertical-align:middle;align-items:stretch;text-align:center;font-size:.9em;line-height:1.15;margin:.1em .16em;white-space:nowrap}.fraction-top{padding:0 .16em .1em}.fraction-bottom{border-top:1.5px solid currentColor;padding:.1em .16em 0}
