@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{font-family:'DM Sans',sans-serif;color:#243a34;background:#f5f6f2;font-synthesis:none;--green:#174c40;--line:#dfe5df}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.4;cursor:wait}[hidden]{display:none!important}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #b4b966;outline-offset:3px}.welcome{min-height:100vh;display:grid;grid-template-columns:1.15fr 1fr}.intro{background:var(--green);color:#fafcf4;padding:clamp(40px,8vw,130px);display:flex;flex-direction:column;justify-content:center}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px}.intro h1{font-size:clamp(42px,5vw,76px);line-height:1.1;letter-spacing:-3px;margin:32px 0;font-family:Manrope,sans-serif}.intro p{font-size:18px;line-height:1.7;color:#d0e0d7;max-width:380px}.package-list{font-size:12px;color:#d9e6ac;margin-top:48px;line-height:2}.join{align-self:center;width:min(410px,80%);margin:60px auto;display:flex;flex-direction:column;gap:16px}.mark{font-family:Manrope,sans-serif;font-size:25px;font-weight:800;letter-spacing:-1px;color:var(--green);text-decoration:none;white-space:nowrap}.mark span{font-weight:400;color:#81928a}.join .mark{margin-bottom:34px}.join h2{font:700 28px Manrope,sans-serif;letter-spacing:-1px;margin:0}.join p,.join small{color:#758079;line-height:1.6}.join label{font-size:13px;font-weight:600}.join input{padding:16px;border:1px solid #ccd6cd;border-radius:8px;background:white}.primary{background:var(--green);color:white;padding:17px;border:0;border-radius:8px;font-weight:600;display:flex;justify-content:space-between}.join small{font-size:12px}header{height:85px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:48px;padding:0 5vw}.course{font-size:10px;letter-spacing:1px;font-weight:700}.course span{display:block;font-size:12px;letter-spacing:0;color:#7c8981;margin-top:5px;font-weight:400}header button{margin-left:auto}main{max-width:1400px;margin:auto;padding:45px 5vw}.page-title{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:36px}h1{font:800 34px Manrope,sans-serif;letter-spacing:-1.4px;margin:12px 0}.page-title p{color:#7a877f;font-size:14px;margin:0}.runtime{font-size:12px;border:1px solid var(--line);background:white;border-radius:30px;padding:12px 16px;max-width:330px}.runtime.ready{color:#27664e;background:#edf4e8}.runtime.error{color:#a03c33}.layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:28px}.panel{border:1px solid var(--line);border-radius:10px;background:#fff;padding:22px;margin-bottom:18px}.panel h2{font-size:14px;margin:0 0 18px}.tool{display:block;width:100%;text-align:left;font-size:12px;border:1px solid var(--line);background:#fafbf8;padding:11px 12px;border-radius:6px;margin:10px 0;color:var(--green)}.hint{font-size:11px;color:#7b887e;line-height:1.7}.panel code{font-size:10px;line-height:2;overflow-wrap:anywhere}.exercise{background:#eff1e5}.exercise p{font-size:12px;line-height:1.7}.exercise .eyebrow{font-size:9px;margin-bottom:16px}#file-list{padding-left:15px;font-size:11px;overflow-wrap:anywhere}.notebook{min-width:0}.notebook-bar{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-bottom:16px}#save-status{color:#879189;font-size:10px}.quiet{border:0;background:transparent;color:var(--green);font-size:12px;padding:8px}.cell{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:18px}.cell-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #eef0eb;padding:10px 16px;font-size:11px;color:#7a877f}.cell-head button{font-size:11px}.run{background:var(--green);color:white;border:0;border-radius:5px;padding:7px 13px;margin-left:12px}.editor{width:100%;display:block;resize:vertical;min-height:150px;border:0;background:#fff;padding:20px 24px;font:12px/1.8 ui-monospace,SFMono-Regular,Consolas,monospace;color:#28433b;tab-size:4}.output{border-top:1px solid #edf0e9;background:#fafbf8;padding:15px 22px;overflow:auto;max-height:650px}.output:empty{display:none}.output pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:4px 0;font:12px/1.6 ui-monospace,monospace}.output img{display:block;max-width:100%;height:auto;margin:10px 0}.output table{border-collapse:collapse;font-size:12px;background:white}.output td,.output th{border:1px solid var(--line);padding:7px 10px;text-align:right}.output .error{color:#a3352c}.cell-status{font-size:10px;color:#587361}.add-cell{border:1px dashed #bfcbbf;background:transparent;width:100%;padding:17px;color:var(--green);border-radius:8px;font-size:12px}.footer-note{font-size:10px;color:#8b958d;text-align:center;line-height:1.8}#notice{font-size:12px;color:#98562b;margin:12px 0;line-height:1.6}@media(max-width:850px){.layout{grid-template-columns:1fr}aside{display:grid;grid-template-columns:1fr 1fr;gap:12px}aside .panel{margin:0}aside .exercise{grid-column:1/-1}.page-title{align-items:flex-start;flex-direction:column}.welcome{grid-template-columns:1fr}.intro{padding:45px}.intro h1{font-size:45px}.package-list{margin-top:20px}header{gap:20px}.course{display:none}main{padding-top:30px}}@media(max-width:480px){aside{grid-template-columns:1fr}h1{font-size:28px}.editor{padding:14px;font-size:12px}.notebook-bar{align-items:flex-start}.panel{padding:16px}}
.student-item.selected{border-color:#174c40;background:#e7eee2;font-weight:700}#admin-login input{padding:10px;border:1px solid var(--line);border-radius:5px}#admin-notice{color:#98562b;font-size:13px;line-height:1.6;margin-bottom:18px}.submission{background:#edf2e5;border:1px solid var(--line);padding:14px 18px;border-radius:8px;display:flex;gap:15px;align-items:center;margin-bottom:18px;font-size:12px}.submission button{margin-left:auto;white-space:nowrap}
.uploaded-files{margin:18px 0 22px;padding:14px;background:#edf4e8;border:1px solid #cfddc9;border-radius:8px}.uploaded-files h3{font-size:12px;margin:0 0 12px;display:flex;justify-content:space-between;align-items:center}.uploaded-files h3 span{background:#174c40;color:#fff;border-radius:20px;padding:2px 7px;font-size:10px}#file-list{list-style:none;padding:0;margin:0}#file-list li{padding:12px 0;border-top:1px solid #cfddc9}#file-list strong{font-size:13px;display:block;color:#174c40;overflow-wrap:anywhere}.file-meta{display:block;font-size:10px;color:#65776a;margin:5px 0 10px}#file-list code{display:block;font-size:10px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}#file-list .tool{background:white;margin-bottom:0}
.code-editor{position:relative;padding-left:var(--gutter-width,44px);background:#f5f7f2;--editor-padding:20px}.line-number-gutter{position:absolute;inset:0 auto 0 0;width:var(--gutter-width,44px);overflow:hidden;border-right:1px solid #e5e9e1;pointer-events:none;user-select:none}.line-number-gutter pre{margin:0;padding:var(--editor-padding) 12px var(--editor-padding) 4px;text-align:right;color:#8a968b;font:12px/21.6px ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}.code-editor .editor{padding:var(--editor-padding) 16px;font:12px/21.6px ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre;overflow-wrap:normal;overflow:auto;min-width:0;border-radius:0}@media(max-width:480px){.code-editor{--editor-padding:14px}}
.reset-class-panel{background:#fff5f1;border-color:#e4c8be}.reset-all{display:block;width:100%;border:0;border-radius:6px;background:#a53d2b;color:white;font:600 13px 'DM Sans',sans-serif;padding:13px 10px}.reset-all:hover{background:#8b3021}.reset-class-panel .hint{margin-bottom:0;color:#79584c}
.delete-all{display:block;width:100%;margin-top:20px;padding:12px 10px;border:1px solid #a53d2b;border-radius:6px;color:#a53d2b;background:white;font:600 12px 'DM Sans',sans-serif}.delete-all:hover{background:#fce6df}
.submission-fail{color:#a3352c}.submission-pass{color:#226745}
.student-item.student-fail{background:#fbe0db;border-color:#df9b90;color:#872719}.student-item.student-pass{background:#dcefdc;border-color:#91be95;color:#20572c}.student-item.student-fail:hover{background:#f5cdc5}.student-item.student-pass:hover{background:#c9e6ca}.student-item.selected{outline:2px solid currentColor;outline-offset:2px;font-weight:700}