:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:#eff4f3;background:#0c1721;font-synthesis:none}
*{box-sizing:border-box}
body{margin:0}
button,input,select,textarea{font:inherit}
button,summary{cursor:pointer}
button{min-height:44px;padding:10px 14px;border:1px solid #57716f;border-radius:10px;background:#203b3e;color:#ecf5ef;font-size:12px;font-weight:650}
button:hover{background:#2d5052}
button:disabled{opacity:.45;cursor:default}
:focus-visible{outline:3px solid #8ceacb;outline-offset:3px}
a{color:inherit}
.class-header{height:76px;padding:18px 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #30434c}
.class-header a{text-decoration:none;letter-spacing:.16em;font-weight:800}
.class-header a span{font-weight:400;letter-spacing:0;margin-left:18px;color:#c4d2d4}
.local-pill{font-size:12px;color:#b4c9c6}
.app{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:18px;padding:18px;max-width:1900px;margin:auto;align-items:start}
.stage{position:relative;min-width:0;border:1px solid #40575e;border-radius:20px;overflow:hidden;background:#1b2d38}
.viewport{position:relative;width:100%;height:calc(100svh - 250px);min-height:420px;max-height:850px}
#scene{display:block;width:100%;height:100%;touch-action:none}
.view-tools{display:flex;justify-content:flex-end;gap:8px;padding:10px 16px;background:#172a33;border-top:1px solid #40575e}
.view-tools button{background:#10242b}
.stage-foot{position:absolute;bottom:14px;left:20px;font-size:11px;line-height:1.6;color:#d4e2df;pointer-events:none;text-shadow:0 1px 4px #000}
.blackboard{padding:18px 24px;background:#122f32;border-top:1px solid #4d6965}
.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-size:10px;color:#aed2c9}
.blackboard h1{font-size:21px;margin:7px 0}
.blackboard p{font-size:13px;line-height:1.5;margin:0;color:#d3e0dc;max-height:90px;overflow:auto;overflow-wrap:anywhere}
.panel{min-width:0;border:1px solid #3b515b;border-radius:20px;padding:20px;background:#12232f;max-height:calc(100svh - 112px);overflow:auto;scrollbar-width:thin}
.tutor-heading h2{font-size:21px;letter-spacing:-.03em;margin:6px 0 12px}
#robot-state{display:inline-block;border:1px solid #806a3c;background:#302e23;border-radius:99px;padding:5px 10px;font-size:11px;color:#f8d994}
#conversation{margin:16px 0;max-height:300px;overflow:auto;overflow-wrap:anywhere;scrollbar-width:thin}
#tutor-status{border-left:2px solid #e6b65b;padding:8px 12px;margin:0;color:#d4e3e0;font-size:13px;line-height:1.6}
#student-question{padding:12px;background:#26474c;border-radius:10px;font-size:13px;white-space:pre-wrap}
#retrieved article{padding:12px 0;border-bottom:1px solid #3e5459}
#retrieved strong{font-size:12px;color:#f4d295}
#model-answer{white-space:pre-wrap}
.tutor h3{font-size:12px;color:#b3dccf;margin:16px 0 8px}
.tutor p,.tutor li{font-size:12px;line-height:1.6;overflow-wrap:anywhere;color:#c5d5d3}
.tutor label{display:block;font-size:12px;margin:12px 0 8px}
.tutor textarea,.tutor select{display:block;width:100%;min-width:0;background:#0b1b25;color:#eff5f3;border:1px solid #637e84;border-radius:9px;padding:10px;font-size:13px}
.tutor textarea{resize:vertical;min-height:68px}
.button-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
#query-form button{background:#edbd6d;color:#1c2727;border-color:#edbd6d;width:100%;font-size:13px}
.operation{display:flex;align-items:center;gap:12px;font-size:11px;line-height:1.5;color:#acc5c2;margin-bottom:14px}
.operation button{padding:8px 10px}
.tutor>details{border-top:1px solid #3a5059;margin-top:0}
.tutor summary{padding:13px 0;min-height:44px;font-size:12px;color:#e0e8e5}
.settings-content{padding-bottom:16px}
.tutor input[type=file]{max-width:100%;width:100%;font-size:11px}
.tutor input::file-selector-button{min-height:44px;background:#c6dfd6;color:#15302e;border:0;border-radius:8px;margin:6px 6px 6px 0;padding:8px}
.tutor .consent{display:flex;align-items:flex-start;gap:8px;font-size:12px;line-height:1.6}
.consent input{flex:none;margin-top:4px}
.model-status{position:absolute;z-index:5;left:50%;top:50%;transform:translate(-50%,-50%);width:min(440px,calc(100% - 32px));padding:18px;border:1px solid #5c7a7f;border-radius:14px;background:#0c222df5;font-size:13px;line-height:1.5}
.model-status .detail{display:block;white-space:pre-wrap;overflow-wrap:anywhere;font-size:11px}
.model-status[data-state=error]{border-color:#d78075}
.progress{height:4px;background:#29434c;margin-top:10px}
.progress i{display:block;height:100%;background:#8ceacb}
.model-status[data-state=error] .progress{display:none}
[hidden]{display:none!important}

html.render-only body{overflow:hidden}
html.render-only .class-header,html.render-only .blackboard,html.render-only .panel,html.render-only .view-tools,html.render-only .stage-foot{display:none}
html.render-only .app{display:block;padding:0;max-width:none}
html.render-only .stage{border:0;border-radius:0}
html.render-only .viewport{height:100svh;min-height:100svh;max-height:none}

@media(max-width:850px){.class-header{height:auto;min-height:65px;padding:12px 16px}
.class-header a span{display:block;margin:3px 0 0;font-size:12px}
.local-pill{font-size:10px;max-width:145px;text-align:right}
.app{display:block;padding:10px}
.viewport{height:350px;min-height:0}
.view-tools{gap:5px;padding:8px 10px}
.view-tools button{font-size:10px;padding:8px}
.stage-foot{bottom:8px;left:12px;font-size:9px}
.blackboard{padding:14px 16px}
.blackboard h1{font-size:18px}
.blackboard p{font-size:12px;max-height:70px}
.panel{margin-top:10px;max-height:none;padding:16px}
.tutor-heading h2{font-size:19px}
#conversation{max-height:240px;margin:12px 0}
.tutor-heading{position:relative}
.tutor-heading #robot-state{position:absolute;right:0;top:0}
.tutor-heading .eyebrow{font-size:9px}
}

@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}
}