:root{--paper:#f8f5ee;--ink:#272c26;--muted:#596357;--sage:#497261;--line:#deded1;--gold:#b48a3c;--clay:#a34d35;--white:#fffdf7}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC',sans-serif}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button,a,input,textarea,summary{outline-offset:5px}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--sage)}.top,main{max-width:1240px;margin:auto;padding:0 36px}.top{display:flex;align-items:center;gap:30px;padding-top:25px;padding-bottom:25px;border-bottom:1px solid var(--line)}.wordmark{display:flex;align-items:center;gap:15px}.wordmark b{font:28px Georgia,'Songti SC',serif}.wordmark span{font-size:9px;letter-spacing:1.5px}nav{margin-left:auto;display:flex;gap:22px;font-size:12px}nav 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.ai-map{margin:35px 0;padding:30px;border:1px solid var(--line);border-radius:8px;background:var(--white)}.ai-map>p{max-width:900px}.ai-privacy{padding:15px;border-left:4px solid var(--sage);background:#edf1e7;font-size:13px;margin:20px 0}.ai-code{display:block;max-width:320px}.ai-code input{display:block;width:100%;border:1px solid #c8ccbe;border-radius:5px;padding:9px;margin-top:6px}.ai-role-grid,.ai-compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin:22px 0}.ai-map fieldset{border:1px solid var(--line);border-radius:6px;padding:18px;min-width:0}.ai-map legend{font-weight:650;font-size:15px}.ai-map label{font-size:12px;font-weight:600;display:block;margin:10px 0}.ai-map textarea{display:block;margin-top:5px;font-weight:400}.ai-map select{font:inherit;font-size:13px;width:100%;padding:9px;border:1px solid #c8ccbe;background:var(--white);border-radius:5px;margin-top:6px}.ai-map button:disabled{opacity:.5;cursor:default}.ai-map textarea:disabled{background:#f1f1eb;color:#4b5248}.ai-map h3{font-size:21px}.ai-compare #ai-closing-fields{display:grid;gap:20px}.ai-compare #ai-original article{border:1px solid var(--line);border-radius:6px;padding:18px;margin-bottom:20px}.ai-compare #ai-original strong{font-size:12px}.ai-compare #ai-original p{font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;margin:5px 0 17px}.ai-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}.ai-shifts{padding:12px 0}.ai-shifts summary{cursor:pointer;font-weight:600;color:var(--sage)}.route ol{grid-template-columns:repeat(3,minmax(0,1fr))}.route li{padding:7px 0}@media(max-width:620px){.ai-map{padding:20px}.ai-role-grid,.ai-compare,.route ol{grid-template-columns:1fr}.ai-map fieldset{padding:12px}.ai-actions .button{width:100%}}

[data-language-toggle]{display:flex;gap:6px;flex-shrink:0}[data-language-toggle] button{font:inherit;font-size:13px;padding:7px 10px;border:1px solid #788f80;border-radius:6px;background:#fffdf8;color:#243b30;cursor:pointer}[data-language-toggle] button[aria-pressed="true"]{background:#365e4b;color:white}.top{flex-wrap:wrap}.ai-map input[type="password"]{display:block;width:min(100%,500px);padding:12px;margin:8px 0;border:1px solid #a3b4a5;border-radius:5px}html[lang="zh-CN"]{font-family:system-ui,"PingFang SC","Microsoft YaHei",sans-serif}html[lang="zh-CN"] h1{letter-spacing:0;line-height:1.2}

/* Lesson-first workshop */
.lesson-launch{max-width:1100px;margin:18px auto;padding:24px;background:#fffdf8;border:1px solid #d9dfd8;border-radius:16px}.lesson-launch h1{font-size:clamp(24px,4vw,38px);margin:0 0 12px}.lesson-launch details{margin:16px 0}.lesson-launch summary,details.ai-map>summary{cursor:pointer;font-weight:650;padding:12px 0}.ai-actions button[aria-pressed="true"]{background:#456451;color:white}details.ai-map>section{border:0;padding:16px 0;margin:0}.player-hint{max-width:1100px;margin:16px auto;padding:0 24px}.player-top{position:static}.activity-frame{min-height:75vh}#activity-save-status{font-weight:650;color:#365c44}

#ai-opening-fields{display:block;max-width:900px}#ai-opening-fields>details{margin-top:24px}#ai-opening-fields fieldset>details{margin-top:20px}#ai-opening-fields label{margin-top:16px}

[hidden]{display:none!important}

#curriculum-pages figure{margin:20px 0}#curriculum-pages figcaption{font-size:14px;margin:10px 0;color:#526158}#lesson-before-copy p{white-space:pre-wrap}

.lesson-launch .ai-map label{display:block;font-size:16px;line-height:1.5;margin:18px 0 8px}

/* One page scroll on phones/tablets; child instruments report their content height. */
.activity-frame{height:800px;min-height:0}
#level-buttons button{min-height:44px;padding:10px 14px;border:1px solid #788f80;border-radius:6px;background:#fffdf8;color:#243b30;font:inherit;cursor:pointer}
#level-buttons button[aria-pressed="true"]{background:#456451;color:#fff}
@media(max-width:620px){
 .lesson-launch{margin:10px 8px;padding:16px}.lesson-launch h1{font-size:26px}.lesson-launch h2{font-size:21px}.lesson-launch p{margin-bottom:10px}
 #level-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-top:12px}#level-buttons button{font-size:14px;line-height:1.3;padding:8px 4px}
 #level-description,#activity-save-status{font-size:14px}.player-top .button{min-height:44px}.player-hint{padding:0 16px}
 .player-top{gap:8px}input,textarea,select{font-size:16px}.hero-actions{gap:12px}nav{flex-wrap:wrap}
}

.free-play-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.free-play-card{min-width:0;padding:22px}.free-play-card h3{min-height:0;font-size:23px}.free-play-card .preview-link{display:block;padding:0;margin-bottom:16px}.free-play-card img{display:block;width:100%;height:240px;object-fit:contain;background:#eef1e9;border:1px solid #d5ddcf;border-radius:8px}.free-play-card .button{margin:8px 0 0;min-height:44px}.free-play-card .small{margin:12px 0;font-size:12px}#free-play{margin:44px 0}@media(max-width:680px){.free-play-grid{grid-template-columns:1fr}.free-play-card img{height:200px}}

/* Language stays on the first header row, ahead of wrapping navigation. */
.top>[data-language-toggle]{order:1;margin-left:auto;align-self:flex-start}.top>nav{order:2;flex-basis:100%}[data-language-toggle]{justify-content:flex-end}[data-language-toggle] button{min-width:44px;min-height:44px}[data-language-toggle] button[aria-pressed=true]{font-weight:700;text-decoration:underline;text-underline-offset:4px}[data-language-toggle] button:focus-visible{outline:3px solid #ac6819;outline-offset:3px}@media(max-width:480px){[data-language-toggle]{gap:4px}[data-language-toggle] button{padding:7px 8px}.top>[data-language-toggle]{flex-shrink:0}}