.lab-body{min-height:100vh}.lab-layout{display:grid;grid-template-columns:290px minmax(0,1fr);min-height:calc(100vh - 72px)}.lesson-nav{padding:30px 22px;background:#f8f9fa;border-right:1px solid var(--line);display:flex;flex-direction:column}.lesson-nav h2{font:700 24px/1.15 Georgia,serif;margin:0 0 15px}.progress-meter{height:7px;background:#e1e5e8;border-radius:20px;overflow:hidden}.progress-meter i{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),#35a69d);transition:width .35s}.lesson-nav small{color:var(--muted)}#lesson-list{display:grid;gap:7px;margin-top:25px}.lesson-button{border:0;background:transparent;text-align:left;padding:12px;border-radius:10px;cursor:pointer;display:grid;grid-template-columns:28px 1fr;color:var(--ink)}.lesson-button span{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#e5e9ec;color:var(--muted);font-size:11px;font-weight:800}.lesson-button strong{font-size:13px}.lesson-button small{grid-column:2}.lesson-button.active{background:white;color:var(--blue);box-shadow:0 5px 20px rgba(25,34,45,.08)}.lesson-button.done span{background:#d9f3e8;color:#087658}.reset-button{margin-top:auto;border:1px solid var(--line);background:white;padding:10px;border-radius:8px;color:var(--muted);cursor:pointer}.lesson-stage{padding:38px clamp(22px,5vw,70px);max-width:1200px;width:100%;margin:0 auto}.lesson-header{display:flex;align-items:start;justify-content:space-between;margin-bottom:25px}.lesson-header h1{font:700 clamp(30px,4vw,46px)/1.05 Georgia,serif;margin:0 0 10px}.lesson-header>div>p:last-child{max-width:760px;color:var(--muted);margin:0}.score-chip{background:#17202a;color:white;border-radius:22px;padding:8px 13px;font-weight:800;white-space:nowrap}.theory-card{background:#172433;color:white;border-radius:14px;padding:24px;margin-bottom:18px;box-shadow:var(--shadow)}.theory-card p{color:#c3ced8;margin:5px 0 0}.theory-card ul{margin-bottom:0}.concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}.concept-card{background:white;border:1px solid var(--line);border-radius:11px;padding:18px}.concept-card b{display:block;margin-bottom:6px}.concept-card p{margin:0;color:var(--muted);font-size:13px}.exercise-card{background:white;border:1px solid var(--line);border-radius:14px;padding:24px;margin:14px 0}.exercise-card header{display:flex;justify-content:space-between;gap:15px}.exercise-card h3{margin:0 0 6px;font-size:18px}.exercise-card header p{margin:0;color:var(--muted)}.exercise-type{font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--blue);font-weight:800;white-space:nowrap}.options{display:grid;gap:9px;margin-top:18px}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);background:white;padding:12px;border-radius:9px;cursor:pointer;text-align:left;color:var(--ink)}.option:hover{border-color:#9eb9ee}.option.selected{border-color:var(--blue);background:var(--blue-soft)}.option.correct{border-color:#39a77e;background:#e7f7f0}.option.incorrect{border-color:#d7646d;background:#fff0f1}.feedback{display:none;margin-top:14px;padding:12px 14px;border-radius:8px;background:#f1f4f6;color:var(--muted)}.feedback.visible{display:block}.feedback.success{background:#e7f7f0;color:#096b50}.feedback.error{background:#fff0f1;color:#9b3039}.check-button{border:0;background:var(--blue);color:white;padding:10px 15px;border-radius:8px;font-weight:800;cursor:pointer;margin-top:15px}.check-button:disabled{opacity:.45}.sort-list{display:grid;gap:8px;margin-top:16px}.sort-item{display:grid;grid-template-columns:32px 1fr 70px;align-items:center;border:1px solid var(--line);padding:10px;border-radius:8px}.sort-item i{font-style:normal;color:var(--muted)}.sort-controls button{border:0;background:#edf1f4;width:26px;height:26px;margin-left:4px;border-radius:5px;cursor:pointer}.builder{display:grid;grid-template-columns:1fr 1.1fr;gap:16px;margin-top:18px}.palette,.canvas{border:1px solid var(--line);border-radius:10px;padding:15px;min-height:190px}.palette h4,.canvas h4{margin:0 0 10px}.token{display:inline-block;border:1px solid #c9d2da;background:#f8fafb;border-radius:7px;padding:8px 10px;margin:4px;cursor:pointer}.token.active{background:var(--blue-soft);border-color:var(--blue);color:var(--blue)}.uml-preview{display:grid;gap:9px}.uml-box{border:2px solid #33475c;border-radius:5px;background:white}.uml-box strong,.uml-box div{display:block;padding:8px 10px}.uml-box strong{background:#eaf1ff;border-bottom:1px solid #aab7c4;text-align:center}.uml-box div{font-family:ui-monospace,monospace;font-size:12px}.relationship{text-align:center;color:var(--muted);font-family:ui-monospace,monospace}.source-note{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:15px;margin-top:22px}.source-note a{color:var(--blue)}.lesson-footer{display:flex;justify-content:space-between;margin-top:25px}.lesson-footer button,dialog button{border:1px solid var(--line);background:white;padding:11px 17px;border-radius:8px;font-weight:800;cursor:pointer}.lesson-footer .primary,dialog button{background:var(--blue);border-color:var(--blue);color:white}dialog{border:0;border-radius:16px;padding:34px;text-align:center;box-shadow:0 25px 80px rgba(0,0,0,.25);max-width:420px}dialog::backdrop{background:rgba(15,25,35,.65)}.celebration{font-size:40px;color:#e1a31f}dialog h2{font:700 30px Georgia,serif;margin:5px}dialog p{color:var(--muted)}
@media(max-width:850px){.lab-layout{grid-template-columns:1fr}.lesson-nav{border-right:0;border-bottom:1px solid var(--line);padding:18px}.lesson-nav h2,.lesson-nav>div>small,.reset-button{display:none}#lesson-list{display:flex;overflow:auto;margin-top:14px}.lesson-button{min-width:145px}.lesson-stage{padding:26px 14px}.concept-grid,.builder{grid-template-columns:1fr}.lesson-header{gap:10px}.score-chip{font-size:11px}.exercise-card{padding:18px}}