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.apparatus-stage{position:relative;isolation:isolate;overflow:hidden;border-radius:14px;background:#fff;padding-bottom:58px}.apparatus-stage img{border-radius:0}.sensor{position:absolute;z-index:3;display:flex;align-items:center;gap:5px;padding:5px 8px;border-radius:9px;background:rgba(255,255,255,.97);border:1px solid rgba(7,29,79,.2);box-shadow:0 5px 14px rgba(7,29,79,.15);transform:translate(-50%,-50%);font-size:clamp(.55rem,1vw,.8rem);white-space:nowrap}.sensor b{color:var(--navy)}.sensor output{font-weight:800;color:var(--red)}.sensor-cold-in output,.sensor-cold-out output{color:var(--blue)}.sensor-t1{left:25%;top:54%}.sensor-t2{left:77%;top:54%}.parallel-stage .sensor-cold-in{left:42%;top:31%}.parallel-stage .sensor-cold-out{left:76%;top:75%}.counter-stage .sensor-cold-in{left:66%;top:31%}.counter-stage .sensor-cold-out{left:27%;top:75%}.run-control{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding:0 32px 12px;color:var(--muted);font-size:.8rem}.run-control label{font-weight:700}.run-select{border:1px solid var(--line);border-radius:9px;padding:7px 30px 7px 10px;background:#fff;color:var(--navy);font-weight:700}tbody tr.active-run{background:#eef8ff;box-shadow:inset 4px 0 var(--blue)}
@media(max-width:900px){.run-control{padding:0 20px 12px}}@media(max-width:540px){.run-control{justify-content:space-between;padding:0 12px 10px}.sensor{padding:3px 5px}}

.solution-brand{max-width:1240px;margin:16px auto 0;padding:0 24px;display:flex;justify-content:flex-end;align-items:center;gap:10px;color:var(--muted);font-size:.72rem;font-weight:600}.solution-brand img{width:150px;height:48px;object-fit:contain;background:#fff;border-radius:8px;padding:4px;border:1px solid var(--line)}.flow-sensor output{color:#6a3dc2}.sensor-mh{left:48%;top:43%}.sensor-mc{left:50%;top:63%}.flow-output{font-weight:700;color:#5b3aa8!important}.lmtd-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.lmtd-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;overflow:hidden}.lmtd-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.lmtd-heading h3{margin:0;color:var(--navy)}.lmtd-card>p{color:var(--muted);font-size:.88rem}.lmtd-card>strong{display:block;color:var(--navy);font-size:.9rem;line-height:1.6;overflow-wrap:anywhere}.temperature-path{position:relative;margin:22px 0 18px;height:112px;border-radius:14px;background:#f6f9fc;border:1px solid var(--line);padding:20px 24px}.path{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;color:var(--red);font-weight:800}.path+.path{margin-top:35px;color:var(--blue)}.path i{display:block;height:4px;border-radius:4px;background:currentColor;position:relative}.path i:after{content:"";position:absolute;right:-2px;top:50%;width:11px;height:11px;border-top:4px solid currentColor;border-right:4px solid currentColor;transform:translateY(-50%) rotate(45deg)}.path.reverse i:after{right:auto;left:-2px;transform:translateY(-50%) rotate(-135deg)}.delta-label{position:absolute;top:44px;color:var(--navy);font-size:.72rem;font-weight:800}.delta-label.inlet{left:20px}.delta-label.outlet{right:20px}.student-form select,.teacher-dialog select,.teacher-dialog input{min-height:43px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:#f9fbfd;color:var(--ink)}.student-form label>span,.teacher-dialog label>span{display:block;margin-bottom:7px;color:var(--navy);font-size:.82rem;font-weight:700}.register-actions{display:flex;gap:8px}.scope-pill{display:inline-flex;border-radius:99px;padding:5px 8px;font-size:.7rem;font-weight:800}.scope-pill.combined{background:#eee9ff;color:#5937a4}.scope-pill.parallel{background:var(--red-soft);color:#b72a1b}.scope-pill.counter{background:var(--blue-soft);color:#0465ae}.teacher-dialog{border:0;padding:0;border-radius:20px;width:min(680px,calc(100% - 32px));max-height:90vh;box-shadow:0 30px 90px rgba(7,29,79,.3)}.teacher-dialog::backdrop{background:rgba(7,20,52,.6);backdrop-filter:blur(4px)}.dialog-card{padding:28px}.dialog-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:20px}.dialog-head h2{color:var(--navy);margin:7px 0 0}.dialog-close{border:0;background:#eef3f8;color:var(--navy);width:36px;height:36px;border-radius:50%;font-size:1.4rem;cursor:pointer}.teacher-dialog label{display:block;margin:14px 0}.teacher-dialog input,.teacher-dialog select{width:100%}.teacher-dialog section{padding:20px 0;border-top:1px solid var(--line)}.teacher-dialog section:first-of-type{border-top:0}.teacher-dialog section h3{color:var(--navy);margin:0}.teacher-dialog section p{color:var(--muted);line-height:1.5}.teacher-status{display:flex;justify-content:space-between;align-items:center;background:#e8f7ee;color:#17663b;border-radius:11px;padding:11px 13px;margin-bottom:10px;font-size:.8rem;font-weight:700}.text-button{border:0;background:transparent;color:inherit;font-weight:800;cursor:pointer}.button.danger{background:#b42318;color:#fff;margin-top:6px}.password-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.password-grid label:first-child{grid-column:1/-1}.teacher-dialog .form-message{min-height:0}.teacher-dialog .form-message:not(:empty){margin-top:10px;padding:9px 11px;border-radius:9px;background:#f7f9fc}.topbar+.solution-brand+main{}.solution-brand+main .hero{padding-top:44px}footer img{width:140px;height:44px;object-fit:contain;background:#fff;border-radius:6px;padding:3px}
.formula small{display:block;color:var(--muted);font-size:.75rem;line-height:1.5;margin-top:7px}.temperature-chart{display:block;width:100%;height:auto;margin:16px 0 8px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,#fbfdff,#f4f8fc)}.temperature-chart .chart-axis{stroke:#70819a;stroke-width:2}.temperature-chart .axis-label{fill:#62708a;font:600 13px Inter,sans-serif;text-anchor:middle}.temperature-chart .axis-label.vertical{transform:rotate(-90deg);transform-origin:18px 145px}.temperature-chart .hot-curve,.temperature-chart .cold-curve{fill:none;stroke-width:5;stroke-linecap:round}.temperature-chart .hot-curve{stroke:var(--red)}.temperature-chart .cold-curve{stroke:var(--blue)}.temperature-chart .delta-line{stroke:#8c98aa;stroke-width:2;stroke-dasharray:5 4}.temperature-chart .hot-text,.temperature-chart .cold-text,.temperature-chart .delta-text{font:800 14px Inter,sans-serif}.temperature-chart .hot-text{fill:#c62f20}.temperature-chart .cold-text{fill:#0465ae}.temperature-chart .delta-text{fill:var(--navy)}.theta-definitions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0}.theta-definitions span{padding:9px 10px;border-radius:9px;background:#f3f7fb;color:var(--navy);font-size:.82rem;font-weight:700;text-align:center}.lmtd-note{display:flex;align-items:flex-start;gap:14px;margin-top:14px;padding:15px 18px;border:1px solid #b9d9ef;border-radius:13px;background:#eef8ff;color:#36536f;font-size:.84rem;line-height:1.55}.lmtd-note strong{color:var(--navy);white-space:nowrap}
@media(max-width:900px){.lmtd-grid{grid-template-columns:1fr}.solution-brand{justify-content:center}.sensor-mh{left:47%;top:43%}.sensor-mc{left:50%;top:64%}footer img{width:120px}}@media(max-width:640px){.register-actions{width:100%;display:grid;grid-template-columns:1fr 1fr}.password-grid{grid-template-columns:1fr}.password-grid label:first-child{grid-column:auto}.flow-sensor{font-size:.5rem}.lmtd-card{padding:18px}.solution-brand{padding:0 16px}.solution-brand span{display:none}.lmtd-note{flex-direction:column;gap:5px}.theta-definitions{grid-template-columns:1fr}.temperature-chart .axis-label{font-size:11px}}

/* Apparatus reading placement: keep values clear of valves and pipework. */
.flow-sensor{top:auto;bottom:7px;transform:translateX(-50%)}
.sensor-mh{left:91%;top:82%;bottom:auto;transform:translate(-50%,-50%)}
.parallel-stage .sensor-mc{left:67%}
.counter-stage .sensor-mc{left:35%}
@media(max-width:900px){.sensor-mh{left:88%;top:82%;bottom:auto}.parallel-stage .sensor-mc{left:67%;top:auto}.counter-stage .sensor-mc{left:35%;top:auto}}

.lmtd-reference-figure{margin:18px 0 0;padding:0;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 10px 28px rgba(7,29,79,.07)}
.lmtd-reference-figure img{display:block;width:100%;height:auto}
.lmtd-reference-figure figcaption{padding:12px 18px;color:var(--muted);font-size:.82rem;text-align:center;border-top:1px solid var(--line)}

/* Updated laboratory specifications and temperature-indicator callouts. */
.hero-stats{padding:20px 24px 8px}
.hero-stats h2{margin:0 0 6px;color:var(--navy);font-size:1.05rem;letter-spacing:-.01em}
.hero-stats div{gap:18px;padding:13px 0}
.hero-stats span{font-size:.82rem;line-height:1.35}
.hero-stats strong{font-size:.86rem;text-align:right;white-space:nowrap}
.sensor:not(.flow-sensor)::before{content:"";position:absolute;left:50%;bottom:calc(100% + 2px);width:2px;height:18px;background:#d6281d;box-shadow:0 0 0 1px rgba(255,255,255,.8)}
.sensor:not(.flow-sensor)::after{content:"TI";position:absolute;left:calc(50% + 5px);bottom:calc(100% + 5px);color:#c51f16;font-size:.62rem;font-weight:900;letter-spacing:.04em}
@media(max-width:640px){.sensor:not(.flow-sensor)::before{height:12px}.sensor:not(.flow-sensor)::after{font-size:.52rem}}

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@media(max-width:1000px){.college-brand>span{display:none}.college-brand>img{width:148px}.topbar nav{gap:16px}.student-form{grid-template-columns:1fr 1fr}.student-form .button{grid-column:1/-1}}@media(max-width:640px){.topbar{height:72px}.college-brand>img{width:130px;height:50px}.quiz-section{padding-top:48px;padding-bottom:48px}.quiz-shell,.class-register{padding:18px}.student-form{grid-template-columns:1fr}.answer-options{grid-template-columns:1fr}.quiz-submit,.result-summary,.register-head,.report-brand{align-items:flex-start;flex-direction:column}.report-brand>div{text-align:left}.report-actions{display:grid;grid-template-columns:1fr 1fr}.review-row{grid-template-columns:32px 1fr}.review-row small{grid-column:2}.quiz-capacity{align-self:flex-start}}@media print{body.print-quiz-report main>section,body.print-quiz-report .topbar,body.print-quiz-report footer{display:none!important}body.print-quiz-report #quiz{display:block!important;padding:0}body.print-quiz-report #quiz>.section-heading,body.print-quiz-report .quiz-start,body.print-quiz-report .quiz-paper,body.print-quiz-report .class-register{display:none!important}body.print-quiz-report .mark-report{display:block!important;border:0;box-shadow:none}body.print-quiz-report .report-actions{display:none!important}}