/* Readable responsive workspace and accessible interactions. */
:root{--pki-blue:#17324d;--pki-accent:#167b7f;--pki-warm:#b26029}
.qc{min-width:0;position:relative}.qc-help{font-size:.85rem!important;color:#53647b!important;margin:0 0 12px!important}.qc-choices,.qc-fields{display:grid;gap:10px}.qc-choice{display:flex;align-items:center;gap:10px;border:1px solid var(--line);padding:12px;border-radius:12px;min-height:50px;background:#fff;cursor:pointer}.qc-choice:has(input:checked){border-color:var(--teal);background:#eafaF6}.qc-choice input{accent-color:var(--teal);width:19px;height:19px;flex-shrink:0}.qc-letter{background:#edf2f7;padding:3px 8px;border-radius:7px;font-weight:800;font-size:.8rem}.qc-choice span:last-child{white-space:pre-wrap;overflow-wrap:anywhere}.qc-field{display:grid;gap:6px;min-width:0}.qc-field>span{font-size:.85rem;font-weight:650}.qc input[type=text],.qc textarea,.qc select{width:100%;font-size:16px;padding:11px;border:1px solid #bdcedc;border-radius:9px;min-height:46px;min-width:0;background:white;color:var(--ink)}.qc textarea{font:14px/1.8 ui-monospace,monospace}.qc-order{padding:0;list-style:none;display:grid;gap:9px;margin:0 0 12px}.qc-order li{display:flex;align-items:center;gap:9px;min-width:0;border:1px solid var(--line);border-radius:11px;background:#fff;padding:10px}.qc-grip{font-size:24px;color:#8191a6;cursor:grab}.qc-order code{flex:1;min-width:0;white-space:pre-wrap;overflow-wrap:anywhere}.qc-arrows{display:flex;gap:4px}.qc-arrows button{width:40px;min-height:44px;border:1px solid var(--line);background:#f3f6fa;border-radius:8px}.qc-arrows button:disabled{opacity:.35}.qc-links{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px;position:relative;isolation:isolate}.qc-side{display:grid;gap:12px;align-content:start;min-width:0}.qc-side button{min-height:56px;padding:12px 9px;background:#fff;border:1px solid #cbd9e2;display:flex;align-items:center;justify-content:space-between;gap:7px;border-radius:10px;text-align:left;position:relative;font-size:14px;overflow-wrap:anywhere;min-width:0}.qc-side button span:not(.qc-port){min-width:0}.qc-port{font-size:12px;color:var(--teal);flex:0 0 10px}.qc-side .selected{outline:3px solid #dfb876;background:#fff8e8}.qc-side .linked{border-color:#80b6ae}.qc-wires{position:absolute;inset:0;width:100%;height:100%;max-width:none;pointer-events:none;z-index:-1;color:var(--teal)}.qc-wires path[data-wire]{fill:none;stroke:currentColor;stroke-width:2.4}.qc-link-summary{display:flex;flex-wrap:wrap;gap:5px;margin:10px 0;font-size:12px;color:#476c70}.qc-link-summary span{background:#f1f7f7;padding:4px 7px;border-radius:6px}.qc-tokens{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.qc-tokens button{padding:8px 12px;min-height:44px;border:1px solid #b9d8d2;background:#eff9f5;border-radius:9px;cursor:grab;color:#185f58}.qc-tokens button.selected{outline:3px solid #ce9d65}.qc-slot{border:1px dashed #bfccd8;padding:12px;border-radius:12px}.qc-chars{display:flex;gap:8px;flex-wrap:wrap}.qc-chars button{min-width:46px;min-height:52px;border:1px solid #c2d2df;background:#fff;border-radius:9px;padding:8px 12px}.qc-chars button small{display:block}.qc-chars button[aria-pressed=true]{background:#d7f2e9;border-color:#298c78}.qc-solution{background:#f1fbf5;border:1px solid #9acfaf;border-radius:12px;padding:14px}.qc-solution input,.qc-solution textarea,.qc-solution select{color:#16673b!important;background:#f2fff6!important;border-color:#91c9a6!important}.qc-solution button{opacity:1;color:#16673b}.qc-template{padding:14px;border-radius:10px;background:#f0f4f8;white-space:pre-wrap;font:14px/1.7 ui-monospace,monospace}.workbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;position:sticky;top:72px;z-index:10;background:#fff;border:1px solid var(--line);border-radius:15px;padding:12px;margin-bottom:18px;box-shadow:0 5px 18px #15354d10}.workbar .progress-line{flex:1;min-width:120px}.workbar small{font-size:12px;display:block;color:var(--muted)}.answer-card{padding:20px 0;border-bottom:1px solid var(--line)}.answer-card h3{font-size:16px;margin:0 0 12px;line-height:1.6;white-space:pre-wrap}.answer-tools{display:flex;flex-wrap:wrap;gap:8px;margin-top:13px}.answer-feedback{margin-top:10px;padding:10px 12px;background:#f5f7fa;border-radius:9px;font-size:14px}.answer-feedback.ok{background:#eaf8ee;color:#146036}.answer-feedback.retry{background:#fff6e9;color:#925215}.answer-info{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px;font-size:12px;color:#62758c}.pro-nav{display:flex;gap:6px;flex-wrap:wrap;padding:8px;background:#eaf0f5;border-radius:15px;margin:18px 0}.pro-nav a{padding:10px 14px;border-radius:10px;text-decoration:none;font-size:14px;font-weight:700;min-height:44px}.pro-nav a.active{background:var(--navy);color:#fff}.pro-toolbar{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0;align-items:center}.pro-toolbar select{min-height:44px;border:1px solid var(--line);border-radius:9px;padding:8px;background:white;max-width:100%}.pro-kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:18px 0}.pro-kpi{background:white;border:1px solid var(--line);border-radius:14px;padding:18px}.pro-kpi b{display:block;font-size:29px}.pro-kpi small{color:#596b80}.pro-list{display:grid;gap:12px}.pro-row{display:flex;gap:14px;align-items:center;justify-content:space-between;border:1px solid var(--line);background:white;padding:16px;border-radius:14px}.pro-row>div{min-width:0}.pro-row p{font-size:13px;color:var(--muted);overflow-wrap:anywhere}.pro-row h3{font-size:17px}.pro-row .actions{display:flex;gap:7px;flex-wrap:wrap;flex-shrink:0}.pro-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.pro-steps{display:flex;flex-wrap:wrap;gap:10px;counter-reset:step}.pro-steps>div{background:#f1f7f8;border-radius:13px;padding:14px;flex:1;min-width:150px;border:1px solid #cfdee4}.pro-steps b{display:block;color:var(--teal)}.pro-steps b:before{counter-increment:step;content:counter(step)' · '}.pro-form label{display:grid;gap:6px;font-weight:700;font-size:13px;margin-bottom:13px}.pro-form input,.pro-form select,.pro-form textarea{font-weight:400;width:100%;border:1px solid #c6d4df;border-radius:10px;padding:11px;background:#fff;min-height:46px;font-size:16px;min-width:0}.pro-form textarea{min-height:100px}.pro-form small{font-weight:400;color:#65768a}.pro-form fieldset{border:1px solid var(--line);border-radius:12px;padding:15px;margin:15px 0}.pro-form legend{font-weight:800;color:var(--teal)}.pro-form .check-label{display:flex;align-items:center;gap:9px}.pro-form .check-label input{width:20px;min-height:20px}.pro-split{display:grid;grid-template-columns:210px minmax(0,1fr);gap:18px}.pro-split aside{align-self:start}.question-mini{border:1px solid var(--line);border-radius:12px;background:#fff;padding:15px;margin:10px 0}.question-mini p{white-space:pre-wrap}.pro-chart{display:grid;gap:9px}.pro-chart-row{display:grid;grid-template-columns:minmax(110px,1fr) 2fr 55px;gap:9px;align-items:center;font-size:13px}.pro-chart-row .bar{height:12px;border-radius:6px;background:#eef2f6;overflow:hidden}.pro-chart-row .bar span{display:block;height:100%;background:var(--teal)}.pro-notice{padding:13px 16px;border-radius:12px;margin:14px 0;background:#fff6df;border:1px solid #eed4a2;color:#725321;font-size:14px}.timer{font:800 24px ui-monospace,monospace;white-space:nowrap}.pro-heading{display:flex;justify-content:space-between;align-items:center;gap:14px}.pro-heading h1{font-size:clamp(23px,4vw,34px)}.pro-error{color:#a63333}.lab{border:1px solid #c2d9dc;border-radius:17px;background:linear-gradient(135deg,#eff8f9,white);padding:20px;margin:18px 0}.lab h3{margin-bottom:10px}.lab-controls{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.lab-controls button{min-width:44px;min-height:44px}.lab-memory{display:flex;gap:12px;flex-wrap:wrap;margin:14px 0}.lab-cell{min-width:100px;flex:1;background:#fff;border:2px solid #b9d6d7;border-radius:12px;padding:12px;text-align:center}.lab-cell small{display:block}.lab-cell b{font:800 25px ui-monospace,monospace}.lab-cell.changed{animation:memory-flash .8s;border-color:#be7b30}.lab-lines{list-style:none;padding:0;margin:12px 0}.lab-lines li{padding:8px 12px;border-left:4px solid transparent;font:14px/1.8 ui-monospace,monospace;white-space:pre-wrap}.lab-lines li.active{background:#d9efeb;border-color:var(--teal);font-weight:bold}.lab-caption{min-height:40px;font-size:14px;color:#376368}.lab-array{display:flex;gap:7px;flex-wrap:wrap}.lab-array span{padding:9px 12px;background:#fff;border:1px solid #aecaCF;border-radius:9px;text-align:center}.lab-array small{display:block;color:#738496}.lab-array .active{background:#e0f2ea;border:2px solid #398d79}.lab-form{display:flex;flex-wrap:wrap;gap:12px}.lab-form label{font-size:13px;display:grid;gap:5px}.lab-form input,.lab-form select{max-width:100%;width:150px;min-height:44px;border:1px solid #b2c9cd;border-radius:9px;padding:8px;background:#fff;font-size:16px}.lesson-map{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:14px 0}.lesson-map>div{padding:15px;border-radius:13px;border:1px solid #d5e2e5;background:#f4f8fb}.lesson-map span{display:block;color:var(--teal);font-weight:800;font-size:12px;margin-bottom:6px}.lesson-map p{font-size:14px}.lesson-content h2{font-size:20px;margin:22px 0 10px}.lesson-content p{margin:10px 0;line-height:1.8}.lesson-content .source-note{font-size:12px;color:var(--muted)}.code-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.code-pair pre{padding:15px;border-radius:12px;background:#f3f6fa;white-space:pre-wrap;font:13px/1.8 ui-monospace,monospace;overflow-wrap:anywhere}.presenting .topbar,.presenting .lesson-aside,.presenting .no-present{display:none!important}.presenting .course-layout{grid-template-columns:1fr}.presenting .lesson-content{font-size:20px}.presenting .lesson-content h1{font-size:36px}.presenting .container{max-width:1400px}.presenting .lab-lines li{font-size:20px}.sticky-lesson{position:sticky;top:85px}.lesson-aside summary{font-weight:bold;padding:12px;cursor:pointer}.pro-pagination{display:flex;flex-wrap:wrap;gap:5px;margin:15px 0}.pro-pagination button{min-width:40px;min-height:42px;border:1px solid var(--line);border-radius:8px;background:#fff}.pro-pagination button.active{background:var(--navy);color:#fff}.pro-footer{display:flex;gap:10px;flex-wrap:wrap;justify-content:space-between;margin-top:22px}.pro-success{background:#eaf8ee;color:#1b603b;padding:15px;border:1px solid #b7d9c4;border-radius:12px}.pro-muted{color:var(--muted);font-size:13px}@keyframes memory-flash{0%{background:#ffdfa2}100%{background:white}}
@media(max-width:900px){.pro-split{grid-template-columns:1fr}.pro-kpis{grid-template-columns:repeat(2,minmax(0,1fr))}.sticky-lesson{position:static!important}.course-layout>aside{position:static!important}.workbar{top:0}.pro-row{flex-wrap:wrap}.pro-row .actions{flex-shrink:1}}
@media(max-width:600px){.pro-grid,.code-pair,.lesson-map{grid-template-columns:1fr}.pro-kpi{padding:13px}.pro-kpi b{font-size:24px}.pro-row{padding:13px}.pro-heading{align-items:flex-start;flex-direction:column}.pro-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.pro-nav a{padding:9px 5px;text-align:center;font-size:12px}.pro-form .form-row{grid-template-columns:1fr}.qc-links{gap:36px}.qc-side button{padding:9px 5px;font-size:12px}.qc-fields{grid-template-columns:1fr}.lab{padding:14px}.lab-form input{width:120px}.pro-toolbar .btn,.answer-tools .btn,.lab-controls .btn,.pro-footer .btn{width:auto}.pro-row .actions{width:100%}.pro-row .actions .btn{flex:1;width:auto}.workbar .btn{width:auto}.qc-order .qc-arrows{flex-direction:column}.qc-order code{font-size:12px}.answer-card{padding:16px 0}.pro-chart-row{grid-template-columns:minmax(90px,1fr) 1.5fr 45px}.modal-body{padding:16px}.exam-question{padding:16px}.topbar .brand .name{white-space:normal}.qc-arrows button{min-height:40px}.qc-links .qc-side>button{touch-action:manipulation}.presenting .lesson-content{font-size:17px}}
@media(prefers-reduced-motion:reduce){.lab-cell.changed{animation:none}}
@media print{.no-print,.pro-nav,.topbar,.lab-controls,.answer-tools{display:none!important}.lab{break-inside:avoid;background:white}.pro-grid,.code-pair{grid-template-columns:1fr 1fr}.container{padding:0!important}.course-layout{display:block}}
.qc-sort-pool{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px;min-height:30px}.qc-sort-pool button,.qc-sort-zone button{padding:10px;border:1px solid #b5c8d4;border-radius:9px;background:white;text-align:left;min-height:44px;color:var(--ink);font-size:14px;cursor:grab}.qc-sort-pool button.selected,.qc-sort-zone button.selected{outline:3px solid #c38c51}.qc-sort-zones{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:12px}.qc-sort-zone{border:2px dashed #b1cdce;padding:14px;border-radius:12px;background:#f0f8f7;min-height:130px;min-width:0}.qc-sort-zone b{color:var(--teal);display:block;margin-bottom:10px}.qc-sort-zone>div{display:grid;gap:8px}.qc-sort-zone button{width:100%}@media(max-width:500px){.qc-sort-zones{grid-template-columns:1fr}.qc-sort-zone{min-height:90px}}
/* Intrinsic grid sizing: tables and code must not widen a mobile card. */
.course-layout>*,.code-pair>*,.lesson-content,.pro-grid>*,.pro-split>*{min-width:0;max-width:100%}
.lesson-content,.lesson-map,.table-wrap{max-width:100%;overflow-wrap:anywhere}
pre,code,.qc-template,.qc textarea,.code-pair pre,.lab-lines li,.lab-cell b,.timer{font-family:"DejaVu Sans Mono",Consolas,"Liberation Mono",monospace}
.lab-cell b{display:block;overflow-wrap:anywhere;font-size:clamp(16px,3vw,25px)}
@media(max-width:980px){.course-layout,.exercise-layout,.pro-split{grid-template-columns:minmax(0,1fr)}}
[data-release-version]{display:block;font-size:12px;color:#53647b;margin-top:8px}