*{box-sizing:border-box}body{margin:0}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;font:inherit}button:disabled{cursor:not-allowed;opacity:.5}.shell{max-width:1180px;margin:auto;padding:0 44px}header{border-bottom:1px solid #dfe6ee;justify-content:space-between;align-items:center;height:100px;display:flex}.brand{color:#172c44;align-items:center;gap:12px;font-size:19px;font-weight:800;text-decoration:none;display:flex}.brand b{font-weight:500}.brand-icon{color:#fff;background:#087a72;border-radius:12px;place-items:center;width:43px;height:43px;display:grid}.course,.eyebrow,.toolkit>span{letter-spacing:1.8px;color:#586b80;font-size:12px;font-weight:700}.eyebrow{color:#087a72;margin-bottom:16px}main{padding:54px 0 38px}h1{letter-spacing:-2px;margin:0 0 19px;font-size:clamp(34px,4.1vw,53px);font-weight:650;line-height:1.12}h1 em{color:#087a72;font-style:normal}.intro{color:#586b80;margin:0 0 34px;font-size:17px;line-height:1.7}.welcome-grid{grid-template-columns:1.15fr 1fr;align-items:center;gap:55px;display:grid}.card{background:#fff;border:1px solid #dce4ed;border-radius:16px;padding:29px;box-shadow:0 8px 25px #19355505}.card-heading{align-items:center;gap:14px;margin-bottom:25px;display:flex}.number{color:#087a72;background:#edf5f5;border-radius:10px;padding:12px;font-size:14px;font-weight:700}h2{letter-spacing:-.5px;margin:0 0 5px;font-size:21px}h3{margin:0 0 22px;font-size:16px}.card p{color:#63758a;margin:0;font-size:14px;line-height:1.7}label{margin:0 0 19px;font-size:14px;font-weight:600;display:block}input{width:100%;font:inherit;color:#172c44;background:#fcfdff;border:1px solid #cfd9e4;border-radius:8px;margin-top:8px;padding:13px 14px;font-size:16px;display:block}input:focus,textarea:focus{outline-offset:3px;outline:2px solid #087a72}.primary{color:#fff;background:#087a72;border:0;border-radius:8px;justify-content:center;align-items:center;gap:12px;width:100%;padding:14px 20px;font-size:15px;font-weight:600;display:flex}.primary:hover{background:#06665f}.privacy{color:#61758a;border-top:1px solid #edf0f4;align-items:center;gap:8px;margin-top:23px;padding-top:17px;font-size:12px;display:flex}.journey>div{align-items:center;gap:17px;margin-bottom:23px;display:flex}.step{border:1px solid #cbd6e1;border-radius:50%;flex-shrink:0;place-items:center;width:34px;height:34px;font-size:14px;display:grid}.step.active{color:#fff;background:#087a72;border-color:#087a72}.journey p{margin:0;font-size:15px}.journey small{color:#63758a;margin-top:4px;font-size:14px;display:block}.hint-note{color:#205b56;background:#e7f2f1;border:1px solid #cfe6e2;border-radius:10px;gap:12px;padding:18px;font-size:14px;line-height:1.6;display:flex}.hint-note svg{flex-shrink:0;margin-top:3px}.hint-note p{margin:0}.toolkit{flex-wrap:wrap;align-items:center;gap:15px;margin-top:34px;display:flex}.toolkit code{color:#536a81;background:#e9eef5;border:1px solid #dee6ef;border-radius:6px;padding:7px 11px;font-size:13px}footer{color:#65778b;border-top:1px solid #dfe6ee;justify-content:space-between;padding:24px 0;font-size:12px;display:flex}.workspace-top{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.workspace-top h1{letter-spacing:-1px;font-size:34px}.badge{color:#087a72;background:#e7f2f1;border-radius:30px;padding:8px 13px;font-size:14px}.activity{grid-template-columns:220px 1fr;gap:28px;margin-top:30px;display:grid}.nav-question{text-align:left;color:#52687d;background:0 0;border:0;border-radius:8px;align-items:center;gap:10px;width:100%;margin-bottom:6px;padding:13px 12px;font-size:14px;display:flex}.nav-question.selected{color:#076b64;background:#dfeeed;font-weight:600}.nav-question span{flex:1}.question h2{margin:15px 0;font-size:25px}.question .prompt{color:#415770;white-space:pre-line;margin-bottom:18px;font-size:16px;line-height:1.8}.editor-head{color:#bdcddb;background:#172c44;border-radius:8px 8px 0 0;justify-content:space-between;padding:11px 16px;font-size:12px;display:flex}.code-editor{resize:vertical;color:#e6f4f7;tab-size:4;background:#102236;border:0;border-radius:0 0 8px 8px;width:100%;min-height:190px;padding:18px;font:15px/1.8 ui-monospace,SFMono-Regular,Consolas,monospace}.actions{flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:20px;display:flex}.actions .primary{width:auto}.secondary{color:#28445e;background:#fff;border:1px solid #cdd8e2;border-radius:8px;align-items:center;gap:8px;padding:11px 16px;font-size:14px;display:inline-flex}.feedback{white-space:pre-line;background:#eef5f9;border-radius:9px;margin-top:18px;padding:16px;font-size:14px;line-height:1.7}.mark{color:#087a72;font-weight:700}.report-score{color:#087a72;font-size:65px;font-weight:650}.report-score small{color:#76889b;font-size:24px}.report-row{border-top:1px solid #e3e9ef;padding:19px 0}.report-row h3{margin:0 0 7px}.report-row p{color:#4f657b}.score-grid{gap:40px;margin:20px 0;display:flex}.hint-revealed{color:#205b56;background:#e7f2f1;border-radius:8px;margin-top:14px;padding:14px;font-size:14px}.error{color:#ac342a;margin:15px 0}.report-head{justify-content:space-between;align-items:center;display:flex}.small{color:#64788c;font-size:14px}@media (max-width:720px){.shell{padding:0 20px}header{height:80px}.course{display:none}main{padding-top:32px}.welcome-grid,.activity{grid-template-columns:1fr;gap:28px}.card{padding:22px}h1{letter-spacing:-1px}.toolkit{gap:8px}.toolkit>span{width:100%}.activity nav{display:flex;overflow:auto}.nav-question{min-width:120px}.nav-question span{white-space:nowrap}.workspace-top{gap:15px}.workspace-top h1{font-size:26px}.badge{font-size:12px}footer{gap:20px}.report-head{align-items:flex-start}.score-grid{gap:20px}.desktop{display:none}}@media print{header,footer,.actions,.no-print{display:none!important}.shell,main{padding:0}.card{box-shadow:none}.report-row{break-inside:avoid}}.end-assignment{z-index:10;background:#fff;border:1px solid #cdd8e2;border-radius:12px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;font-size:14px;display:flex;position:sticky;bottom:12px;box-shadow:0 4px 24px #172c4415}.end-assignment p{margin:0;line-height:1.7}.end-assignment .actions{margin:0}.end-assignment .primary{width:auto}.sync-status{color:#52687d;justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px;font-size:13px;display:flex}.reflection{max-width:760px;margin:auto}.reflection>p{margin-bottom:28px}.reflection textarea{width:100%;font:inherit;resize:vertical;border:1px solid #cdd8e2;border-radius:8px;margin-top:10px;padding:14px;font-size:16px;display:block}.answer-feedback{text-align:center;gap:24px!important;max-width:min(550px,100% - 32px)!important;padding:40px!important}.answer-feedback .correct-title{color:#078341;font-size:clamp(48px,10vw,76px);font-weight:800}.answer-feedback .retry-title{color:#b54b19;font-size:clamp(40px,9vw,64px);font-weight:800}.answer-feedback [data-slot=dialog-description]{font-size:18px;line-height:1.6}.teacher-table td{vertical-align:top}footer a{color:#087a72;text-decoration:underline}.teacher-report-link{flex-shrink:0;font-weight:600;text-decoration:none}header{gap:16px}@media (max-width:480px){header{flex-wrap:wrap;gap:12px;height:auto;min-height:90px;padding:16px 0}.teacher-report-link{padding:9px 12px}}

/* Base (from the original global styles) */
html{-webkit-text-size-adjust:100%}
body{font-family:Geist,Arial,Helvetica,sans-serif;background:#f4f7fb;color:#172c44;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
pre{font:13px/1.7 "Geist Mono",ui-monospace,SFMono-Regular,Consolas,monospace}
svg{display:inline-block;vertical-align:middle}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* Progress bar */
.progress-track{background:#e3e9ef;height:4px;border-radius:999px;overflow:hidden;width:100%}
.progress-indicator{background:#087a72;height:100%;transition:width .3s}

/* Step-by-step question layout */
.steps{margin:0 0 20px;padding:0;list-style:none;counter-reset:step}
.steps li{counter-increment:step;position:relative;padding:12px 14px 12px 52px;margin-bottom:8px;background:#f7fafc;border:1px solid #e3e9ef;border-radius:10px;color:#415770;font-size:15px;line-height:1.65}
.steps li::before{content:counter(step);position:absolute;left:14px;top:11px;width:26px;height:26px;border-radius:50%;background:#e7f2f1;color:#087a72;font-size:13px;font-weight:700;display:grid;place-items:center}
.steps code,.question .prompt code{background:#e9eef5;border-radius:5px;padding:1px 6px;font:13px "Geist Mono",ui-monospace,monospace;color:#28445e}
.steps-label{font-size:12px;font-weight:700;letter-spacing:1.8px;color:#586b80;margin:0 0 10px}

/* Answer dialog */
.dialog-overlay{position:fixed;inset:0;z-index:50;background:rgba(0,0,0,.1);backdrop-filter:blur(4px);display:grid;place-items:center;animation:fade .1s}
.dialog-content{background:#fff;border-radius:12px;box-shadow:0 0 0 1px rgba(23,44,68,.1);display:grid;width:100%;font-size:14px;animation:zoom .1s}
.dialog-content h2{margin:0;line-height:1}
.dialog-content p{margin:0;color:#64788c}
@keyframes fade{from{opacity:0}}
@keyframes zoom{from{opacity:0;transform:scale(.95)}}

/* Output of a correct answer */
.output-toggle{margin-top:14px}
.output-panel{margin-top:16px}
.output-panel .editor-head{align-items:center}
.output-hide{background:none;border:0;color:#bdcddb;font-size:12px;padding:0;text-decoration:underline}
.output-run{background:#102236;padding:14px 18px;border-top:1px solid #1d3550}
.output-run:last-child{border-radius:0 0 8px 8px}
.output-label{color:#7f97ad;font-size:12px;margin-bottom:6px}
.output-run pre{margin:0;color:#e6f4f7;white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px}

/* Worked answer: no selecting or copying */
.no-copy{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;cursor:default}
@media print{.no-copy{display:none}}
.solution-canvas{display:block;margin:12px 0;pointer-events:none}

/* Teacher page */
.auth-tabs{display:flex;gap:6px;background:#edf2f7;border-radius:10px;padding:4px;margin-bottom:24px}
.auth-tabs button{flex:1;border:0;background:none;border-radius:8px;padding:10px 12px;font-size:14px;color:#52687d}
.auth-tabs button.selected{background:#fff;color:#076b64;font-weight:600;box-shadow:0 1px 3px #172c4415}
.card a,.small a{color:#087a72}
.top-buttons{display:flex;flex-wrap:wrap;gap:10px}
.score-grid b{font-size:30px;color:#087a72}
.score-grid p{margin:2px 0 0;color:#63758a;font-size:14px}
.table-wrap{overflow-x:auto}
.teacher-table{width:100%;border-collapse:collapse;font-size:14px}
.teacher-table th{text-align:left;font-weight:600;white-space:nowrap;padding:10px 8px;border-bottom:1px solid #dce4ed}
.teacher-table td{padding:12px 8px;border-bottom:1px solid #edf0f4;white-space:nowrap}
.teacher-table td.wrap{white-space:normal;min-width:210px;max-width:340px}
.teacher-table tr:last-child td{border-bottom:0}
.teacher-table tr:hover td{background:#f7fafc}
.teacher-table details p{margin:8px 0}
.answer-block{border-top:1px solid #e3e9ef;padding:10px 0}
.answer-block pre{background:#102236;color:#e6f4f7;border-radius:8px;padding:10px 12px;margin:6px 0 0;white-space:pre-wrap;overflow-wrap:anywhere;font-size:12.5px}
.link-button{background:none;border:0;padding:0;margin-top:8px;color:#ac342a;font-size:13px;text-decoration:underline;display:block}
@media print{.teacher-table td.wrap{max-width:none}details{display:block}}