:root{--ink:#102a43;--muted:#627d98;--line:#d6e3ec;--bg:#edf4f8;--panel:#fff;--nav:#0b263e;--blue:#0b66b2;--cyan:#0aa6b7;--orange:#ef7d00;--red:#c63d3d;--green:#15835b;--yellow:#fff5d9;--shadow:0 12px 30px rgba(16,42,67,.1)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.45 Inter,"Segoe UI",Arial,sans-serif}button,select,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(11,102,178,.28);outline-offset:2px}
.app-header{height:68px;background:var(--nav);color:#fff;border-bottom:4px solid var(--orange);display:flex;align-items:center;gap:24px;padding:0 28px;position:sticky;top:0;z-index:20}.brand{color:#fff;text-decoration:none;font-weight:900;letter-spacing:.05em}.brand span{color:#70d5df}.course-title{font-weight:700}.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.header-back{display:inline-flex;align-items:center;min-height:36px;padding:7px 13px;border:1px solid #5c829b;border-radius:9px;color:#fff;background:#164663;text-decoration:none;font-size:.88rem;font-weight:800}.header-back:hover{background:#1e5a7d;border-color:#7ba5bd}.user-chip{background:#183d59;border:1px solid #356079;border-radius:999px;padding:7px 12px;font-size:.9rem;white-space:nowrap}.user-chip.teacher{background:#74521a;border-color:#d49a3a;color:#fff5d9}
.app-shell{display:grid;grid-template-columns:300px minmax(0,1fr);min-height:calc(100vh - 68px)}.sidebar{background:#f8fbfd;border-right:1px solid var(--line);padding:20px 14px;position:sticky;top:68px;height:calc(100vh - 68px);overflow:auto}.sidebar-head{padding:0 10px 14px}.sidebar-head strong,.sidebar-head span{display:block}.sidebar-head span{font-size:.85rem;color:var(--muted);margin-top:3px}.block-link{width:100%;border:0;background:transparent;border-radius:10px;padding:11px 10px;display:grid;grid-template-columns:30px 1fr 20px;gap:8px;align-items:center;text-align:left;color:var(--ink);margin:2px 0}.block-link:hover{background:#eaf3f8}.block-link.active{background:#ddecf8;color:#07518c;font-weight:800}.block-link.done .block-num{background:var(--green)}.block-num{width:27px;height:27px;border-radius:8px;background:#7791a4;color:#fff;display:grid;place-items:center;font-size:.82rem;font-weight:800}.block-check{color:var(--green);font-weight:900}.overall{border-top:1px solid var(--line);margin-top:14px;padding:16px 10px}.overall>div:first-child{display:flex;justify-content:space-between}.overall span{color:var(--muted);font-size:.84rem}.progress{height:8px;background:#dfeaf1;border-radius:99px;margin-top:9px;overflow:hidden}.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .3s}.teacher-toggle,.back-link{width:calc(100% - 20px);margin:4px 10px;border-radius:9px;padding:10px}.teacher-toggle{border:1px solid #9bb3c3;background:#fff;color:var(--ink);font-weight:750}.teacher-toggle.active{background:#fff4dc;border-color:#e5af45}.back-link{display:block;color:var(--blue);text-decoration:none;text-align:center}
.main-area{padding:24px clamp(16px,3vw,42px) 36px;max-width:1450px;width:100%;margin:0 auto}.mobile-top{display:none}.lesson-head{display:flex;gap:18px;align-items:start;margin-bottom:18px}.lesson-kicker{color:var(--blue);font-weight:850;text-transform:uppercase;letter-spacing:.05em;font-size:.82rem}.lesson-head h1{margin:4px 0 5px;font-size:clamp(1.65rem,3vw,2.45rem);line-height:1.1}.lesson-head p{margin:0;color:var(--muted);max-width:900px}.score-pill{margin-left:auto;white-space:nowrap;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px;font-weight:800}
.trainer-return-btn{width:calc(100% - 20px);min-height:50px;display:flex;align-items:center;justify-content:center;margin:0 10px 16px;padding:9px 12px;border:2px solid #00ff3c;border-radius:12px;background:#064523;color:#00ff3c;box-shadow:0 0 8px #00ff3c;text-align:center;text-decoration:none;font-weight:850;line-height:1.22;transition:.2s ease}.trainer-return-btn:hover{background:#0a6a36;box-shadow:0 0 12px #00ff3c;transform:translateY(-2px)}.trainer-return-btn:focus-visible{outline:3px solid rgba(0,255,60,.3);outline-offset:3px}
.teacher-note{display:none;background:#fff7df;border:1px solid #ecd18e;border-left:5px solid var(--orange);border-radius:10px;padding:16px 18px;margin-bottom:18px}.teacher-mode .teacher-note{display:block}.teacher-note>strong{display:block;margin-bottom:8px;font-size:1.08rem}.teacher-guide{display:grid;gap:12px}.teacher-guide p{margin:0}.teacher-guide strong{display:block;margin-bottom:4px;color:#704600}.teacher-guide-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);gap:18px}.teacher-guide ol,.teacher-guide ul{margin:6px 0 0;padding-left:22px}.teacher-guide li{margin:0 0 7px}.teacher-result{background:#eaf7f0;border-left:4px solid var(--green);border-radius:7px;padding:10px 12px}.teacher-mistake{background:#fff0e8;border-left:4px solid var(--orange);border-radius:7px;padding:10px 12px}
.grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);gap:18px}.card{background:var(--panel);border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow);padding:20px}.card h2,.card h3{margin:0 0 12px}.muted{color:var(--muted)}.stack{display:grid;gap:12px}.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}.three{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:15px}.tab{border:1px solid var(--line);background:#fff;border-radius:9px;padding:10px;font-weight:750}.tab.active{background:#e6f3fd;border-color:var(--blue);color:#07518c}.metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.metric{background:#f2f7fa;border-radius:10px;padding:10px}.metric span{display:block;font-size:.78rem;color:var(--muted)}.metric strong{font-size:1.08rem}.good{color:var(--green)!important}.warn{color:var(--orange)!important}.bad{color:var(--red)!important}
.sim{min-height:340px}.thermo-panel{display:grid;grid-template-columns:150px 1fr;gap:20px;align-items:center}.thermo{height:245px;width:88px;position:relative;margin:auto}.tube{position:absolute;left:28px;top:4px;width:32px;height:190px;border:4px solid #b8cad6;border-radius:20px 20px 5px 5px;background:#f7fbfd;overflow:hidden}.mercury{position:absolute;left:5px;right:5px;bottom:0;height:40%;background:linear-gradient(#ffb438,var(--orange));transition:height .35s}.bulb{position:absolute;left:14px;bottom:0;width:60px;height:60px;border:4px solid #b8cad6;border-radius:50%;background:var(--orange);box-shadow:inset 0 0 0 7px #ffad2e}.big-value{text-align:center;font-size:2rem;font-weight:900}.fan-box,.plc-box{border:2px solid #bad0de;background:#f5fafc;border-radius:12px;padding:15px;text-align:center;font-weight:800}.fan-box.on{border-color:var(--green);background:#e7f6ef}.fan-icon{display:inline-block;margin-right:6px;font-size:1.5rem}.fan-box.on .fan-icon{animation:spin .65s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.control{margin-top:13px}.control label{display:flex;justify-content:space-between;font-weight:750;margin-bottom:6px}.control input[type=range]{width:100%;accent-color:var(--blue)}.btn-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.btn{border:0;border-radius:9px;padding:10px 14px;font-weight:800}.btn.primary{background:var(--blue);color:#fff}.btn.danger{background:var(--red);color:#fff}.btn.success{background:var(--green);color:#fff}.btn.ghost{background:#e7eef3;color:var(--ink)}.btn:disabled{opacity:.52;cursor:not-allowed}
.question{padding:12px 0;border-bottom:1px solid var(--line)}.question:last-of-type{border-bottom:0}.question label{display:block;font-weight:750;margin-bottom:6px}.question select,.question input[type=text],textarea{width:100%;border:1px solid #adc3d1;border-radius:8px;padding:9px;background:#fff;color:var(--ink)}.feedback{display:none;margin-top:14px;padding:12px;border-radius:9px;font-weight:750}.feedback.show{display:block}.feedback.ok{background:#e7f6ef;color:#0c6948}.feedback.no{background:#fff0e3;color:#944500}
.flow-chain{display:flex;align-items:center;gap:7px;overflow-x:auto;padding:12px 2px}.flow-node{min-width:120px;min-height:70px;border:2px solid #b8ccd9;border-radius:10px;background:#f7fbfd;padding:9px;text-align:center;display:grid;place-items:center;font-weight:750}.flow-node.active{border-color:var(--cyan);background:#e8fbfd}.flow-node.fault{border-color:var(--red);background:#fff0f0}.flow-arrow{color:var(--blue);font-weight:900;font-size:1.35rem}.canvas-wrap{background:#0b263e;border-radius:12px;padding:10px}.canvas-wrap canvas{width:100%;height:230px;display:block}.legend{display:flex;gap:16px;color:#d8e8f2;font-size:.85rem;padding:5px 8px}.legend i{display:inline-block;width:18px;height:3px;margin-right:6px;vertical-align:middle}
.choice-grid{display:grid;gap:8px}.choice-row{display:grid;grid-template-columns:1fr minmax(190px,.8fr);gap:10px;align-items:center;background:#f4f8fb;border-radius:9px;padding:10px}.sequence{counter-reset:item;display:grid;gap:8px}.sequence-row{display:grid;grid-template-columns:34px 1fr 90px;gap:9px;align-items:center;background:#f4f8fb;padding:8px;border-radius:9px}.sequence-row::before{counter-increment:item;content:counter(item);width:27px;height:27px;border-radius:50%;background:#dceaf4;display:grid;place-items:center;font-weight:850}.sequence-row select{border:1px solid #adc3d1;border-radius:7px;padding:7px}.channel-map{display:grid;grid-template-columns:repeat(7,minmax(105px,1fr));gap:7px;overflow-x:auto}.channel-node{border:2px solid #bed0dc;background:#f7fbfd;border-radius:10px;padding:11px 7px;text-align:center;min-height:78px;font-weight:700;cursor:pointer}.channel-node.selected{border-color:var(--blue);background:#e6f3fd}.channel-node.fault{border-color:var(--red);background:#fff0f0}.votes{display:flex;gap:10px;justify-content:center;margin:16px 0}.vote{border:1px solid #abc0cf;background:#fff;border-radius:10px;padding:12px 18px;font-weight:850}.vote.trip{background:#ffe9e9;border-color:var(--red);color:var(--red)}
.scenario-list{display:grid;gap:9px}.scenario{display:grid;grid-template-columns:1fr auto;gap:12px;background:#f4f8fb;padding:11px;border-radius:9px}.scenario select{border:1px solid #adc3d1;border-radius:7px;padding:7px}.checklist{display:grid;gap:8px}.checkline{display:flex;gap:10px;align-items:flex-start;background:#f4f8fb;padding:9px;border-radius:8px}.checkline input{margin-top:4px;accent-color:var(--blue)}.protocol{min-height:190px;font-family:Consolas,monospace;font-size:.9rem}.lesson-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}.lesson-footer>div{color:var(--muted);text-align:center;font-size:.9rem}
@media(max-width:1050px){.app-shell{grid-template-columns:1fr}.sidebar{display:none}.mobile-top{display:flex;gap:10px;align-items:center;margin-bottom:15px}.mobile-top select{flex:1;border:1px solid #adc3d1;border-radius:8px;padding:9px}.grid,.teacher-guide-grid{grid-template-columns:1fr}}
@media(max-width:680px){.app-header{height:auto;min-height:68px;padding:11px 16px;flex-wrap:wrap;gap:7px 14px}.course-title{order:3;width:100%;font-size:.85rem}.header-actions{margin-left:auto}.header-back{font-size:.78rem;padding:6px 9px}.user-chip{display:none}.main-area{padding:16px}.lesson-head{display:block}.score-pill{display:inline-block;margin:10px 0 0}.two,.three,.metric-row,.tabs{grid-template-columns:1fr}.thermo-panel{grid-template-columns:1fr}.choice-row{grid-template-columns:1fr}.sequence-row{grid-template-columns:34px 1fr}.sequence-row select{grid-column:2}.lesson-footer{flex-wrap:wrap}.lesson-footer>div{order:3;width:100%}.card{padding:15px}}
@media print{.app-header,.sidebar,.mobile-top,.lesson-footer,.btn,.tabs{display:none!important}.app-shell{display:block}.main-area{padding:0}.card{box-shadow:none;break-inside:avoid}.teacher-note{display:block}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.fan-box.on .fan-icon{animation:none}}