.laboratory-room-content{max-width:1550px}.laboratory-room{position:relative;isolation:isolate;min-height:560px;border-radius:25px;overflow:hidden;background:#20262b;margin-top:28px}.laboratory-room>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 62%;z-index:-2}.lab-room-shade{position:absolute;inset:0;z-index:-1;background:linear-gradient(0deg,#101921cc,transparent 65%),linear-gradient(90deg,#10192136,#10192112)}.lab-room-hotspot{position:absolute;display:flex;align-items:center;gap:17px;color:white!important;border:1px solid #ffffff45;background:#16212bcb;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);padding:20px 23px;border-radius:17px;max-width:390px;box-shadow:0 10px 45px #0002}.lab-room-hotspot:hover{background:#233a4ce8;border-color:#afdcff;transform:translateY(-3px)}.lab-room-hotspot>span:nth-child(2){display:grid;gap:6px;min-width:0}.lab-room-hotspot strong{font-size:21px;line-height:1.35;font-weight:550;letter-spacing:-.4px}.lab-room-hotspot>span>span{font-size:12px;line-height:1.65;color:#d0dce5}.hotspot-dot{display:grid;place-items:center;width:47px;height:47px;flex:none;background:#ffffff13;border:1px solid #fff4;border-radius:50%;box-shadow:0 0 0 7px #d4ebff0d}.hotspot-experiments{left:6%;top:51%}.hotspot-titration{right:5%;top:27%}.lab-room-caption{position:absolute;bottom:27px;left:35px;right:35px;color:#f4f7fa;font-size:14px;line-height:1.7}.lab-room-credit{font-size:11px;color:var(--muted);line-height:1.8;margin-top:16px}.titration-mobile-dose{display:none}.module-expanded{overflow:hidden}.immersive-toolbar[hidden]{display:none}.immersive-stage.is-expanded{position:fixed!important;inset:0;z-index:1100;margin:0!important;width:100vw;height:100dvh;max-width:none!important;border:0;border-radius:0;background:var(--surface);display:flex;flex-direction:column}.immersive-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px 22px;flex:none;background:var(--surface);border-bottom:1px solid var(--line)}.immersive-toolbar>strong{font-size:16px;font-weight:500}.immersive-toolbar .btn{font-size:14px;min-height:42px;gap:10px}.immersive-stage.is-expanded .tool-frame{flex:1;min-height:0;height:auto;width:100%;background:white}.tool-source>summary{cursor:pointer;font-size:12px}.tool-source>p{margin-top:12px}
.titration-content{max-width:1530px}.titration-intro{margin-top:24px}.titration-intro>.tool-field{max-width:650px;font-size:14px;margin-bottom:23px}.titration-intro .select{font-size:16px}.titration-intro h2{font-size:25px;margin-bottom:15px}.titration-intro p,.titration-intro li{font-size:15px;line-height:1.9;color:var(--muted);max-width:1000px}.titration-intro>.tool-field+p,.titration-intro>p{margin-top:20px}.titration-intro .titration-equation{font-size:22px;line-height:1.9;color:var(--ink);margin:16px 0}.titration-intro summary{font-size:14px;color:var(--blue);cursor:pointer;margin-top:16px}.titration-intro ol{padding-left:24px;margin:20px 0}.titration-intro li+li{margin-top:10px}.titration-source-links{margin-top:15px;display:grid;gap:10px;font-size:12px;line-height:1.8}.titration-layout{display:grid;grid-template-columns:minmax(240px,.62fr) minmax(0,1.6fr);gap:22px;align-items:start}.titration-controls .tool-field{font-size:13px;margin-bottom:20px}.titration-controls .tool-input{font-size:16px}.titration-controls h2{font-size:22px;margin-bottom:25px}.titration-added{border-top:1px solid var(--line);padding-top:20px;margin:20px 0;display:grid;gap:6px}.titration-added>span{font-size:13px;color:var(--muted)}.titration-added>strong{font-size:30px;font-weight:500;font-variant-numeric:tabular-nums;letter-spacing:-1px}.titration-drop{width:100%;min-height:50px;font-size:15px;justify-content:space-between;gap:10px}.titration-drop>span{font-size:12px;opacity:.8}.titration-dose-actions{display:grid;gap:17px;margin:14px 0 23px;text-align:center}.titration-dose-actions>.btn{font-size:14px;min-height:43px}.titration-dose-actions>.text-link{font-size:13px}.titration-near{font-size:14px;display:flex;align-items:center;gap:8px;line-height:1.8}.titration-limits{font-size:11px!important;line-height:1.85!important;margin-top:20px;color:var(--muted)}.titration-metrics{display:flex;align-items:flex-start;justify-content:space-between;gap:25px;flex-wrap:wrap}.titration-metrics>div{display:grid;gap:7px}.titration-metrics span{font-size:12px;color:var(--muted)}.titration-metrics strong{font-size:30px;font-weight:500;letter-spacing:-.8px;font-variant-numeric:tabular-nums}.titration-visual-grid{display:grid;grid-template-columns:minmax(100px,.38fr) minmax(0,1fr);gap:15px;align-items:center;margin-top:25px}.titration-apparatus>svg{display:block;width:100%;max-height:420px}.titration-apparatus>p{text-align:center;font-size:14px;color:var(--muted);margin-top:10px;overflow-wrap:anywhere}.titration-stand{fill:none;stroke:var(--muted);stroke-width:4;stroke-linecap:round}.titration-tube-fill{fill:var(--titrant-color);opacity:.8;transition:height .3s,y .3s}.titration-tube,.titration-valve,.titration-flask,.titration-table{fill:none;stroke:var(--muted);stroke-width:2;stroke-linejoin:round}.titration-valve{stroke-width:4;stroke:var(--blue)}.titration-tick{fill:none;stroke:var(--muted);stroke-width:1}.titration-apparatus text{fill:var(--muted);font-size:13px;font-family:Onest,system-ui,sans-serif}.titration-sample{fill:var(--sample-color);fill-opacity:.8;transition:fill .3s}.titration-droplet{fill:var(--titrant-color);opacity:0}.adding-drop .titration-droplet{animation:titration-drop .6s ease-in forwards}.titration-table{stroke:var(--line)}#titration-curve>svg{display:block;width:100%;overflow:visible}#titration-curve text{fill:var(--muted);font-size:12px;font-family:Onest,system-ui,sans-serif}.titration-endpoint{stroke:var(--muted);stroke-width:1;stroke-dasharray:4 5;opacity:.6}.titration-chart-key{color:var(--muted);font-size:10px;line-height:1.8;margin-top:14px}.titration-chart-key>i{display:inline-block;width:20px;height:1px;border-top:1px dashed var(--muted);vertical-align:middle;margin-right:5px}.titration-observation{border-top:1px solid var(--line);padding-top:22px;margin-top:23px}.titration-observation>h2{font-size:21px;line-height:1.45;margin-bottom:13px}.titration-observation>p{font-size:14px;line-height:1.9;color:var(--muted)}
.theory-exam-sections{display:flex;gap:12px;flex-wrap:wrap;margin:25px 0 30px}.theory-exam-sections>a{font-size:14px;padding:10px 15px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.theory-exam-sections>a:hover{background:var(--blue-soft);border-color:var(--blue)}.exam-theory-intro{padding:23px 26px;background:var(--surface);border:1px solid var(--line);border-radius:16px;margin-bottom:25px}.exam-theory-intro>p{font-size:15px;line-height:1.9;max-width:1000px}.exam-theory-intro>span{display:block;color:var(--muted);font-size:12px;margin-top:16px}.exam-guide-cards{display:grid;gap:12px}.exam-guide-card{display:flex;align-items:center;gap:22px;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:16px;color:var(--ink)}.exam-guide-card:hover{border-color:var(--blue)}.exam-guide-number{width:44px;height:44px;flex:none;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px;color:var(--blue);font-size:20px;font-weight:500;background:var(--blue-soft)}.exam-guide-card>span:nth-child(2){flex:1;min-width:0}.exam-guide-card h2{font-size:20px;line-height:1.45;letter-spacing:-.4px}.exam-guide-card p{font-size:14px;color:var(--muted);line-height:1.8;margin-top:10px}.exam-guide-card>svg{color:var(--muted)}.exam-guide-reader{max-width:1250px}.exam-guide-article{max-width:1000px;margin:12px auto 0}.exam-guide-article>header{margin-bottom:38px}.exam-guide-article>header>p{font-size:13px;color:var(--muted);margin-bottom:18px}.exam-guide-article h1{font-size:37px;line-height:1.25;letter-spacing:-1px}.exam-guide-body h2{font-size:25px;line-height:1.4;margin:35px 0 20px}.exam-guide-body p,.exam-guide-body li{font-size:16px;line-height:1.95;overflow-wrap:anywhere}.exam-guide-body ol,.exam-guide-body ul{padding-left:25px;margin:20px 0}.exam-guide-body li{padding-left:7px}.exam-guide-body li+li{margin-top:14px}.exam-guide-pitfall{border-left:3px solid var(--blue);padding:19px 24px;background:var(--surface-alt);border-radius:0 12px 12px 0;margin:30px 0}.exam-guide-pitfall h3{font-size:18px;margin-bottom:10px}.exam-guide-pitfall p{font-size:15px;color:var(--muted)}.exam-related{margin:50px 0 20px;border-top:1px solid var(--line);padding-top:35px}.exam-related>h2{font-size:26px;margin-bottom:25px}.exam-guide-practice{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}.exam-concepts{font-size:16px;line-height:2;padding-left:24px}.exam-guide-paging{display:flex;justify-content:space-between;gap:15px;margin:45px auto 15px;max-width:1000px}.exam-guide-summary{max-width:1000px;border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:28px;margin:30px 0}.exam-guide-summary>h2{font-size:27px;line-height:1.4}.exam-guide-inline h2{font-size:21px;margin-top:26px}.exam-guide-inline p,.exam-guide-inline li{font-size:15px}.exam-guide-summary>.text-link{font-size:14px;display:inline-flex;align-items:center;gap:9px;margin:20px 0}.exam-related-heading{font-size:25px;margin:40px 0 25px}.exam-guide-reader .theory-sources p,.exam-guide-summary .theory-sources p{font-size:13px;line-height:1.85;color:var(--muted)}.exam-theory-shortcut{display:inline-flex;align-items:center;gap:10px;margin:23px 0 10px}
.titration-config-summary{font-size:13px;line-height:1.8;color:var(--muted);margin:16px 0 22px}.titration-parameters>summary{color:var(--blue);font-size:14px;cursor:pointer;line-height:1.6}.titration-parameters[open]>summary{margin-bottom:22px}.titration-parameters .tool-field{margin-top:20px}.titration-added{margin-top:25px}.exam-extra-topics{margin:25px 0}.exam-extra-topics>summary{cursor:pointer;font-size:15px;line-height:1.6;color:var(--blue);margin-bottom:22px}.exam-guide-card p{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
@keyframes titration-drop{0%{opacity:1;transform:translateY(0)}80%{opacity:1}100%{opacity:0;transform:translateY(95px)}}
@media(max-width:1150px){.lab-room-hotspot{max-width:340px;padding:18px;gap:13px}.lab-room-hotspot strong{font-size:19px}.hotspot-experiments{left:4%;top:60%}.hotspot-titration{right:4%;top:24%}.titration-layout{grid-template-columns:minmax(225px,.7fr) minmax(0,1.3fr);gap:17px}.titration-visual-grid{grid-template-columns:1fr}.titration-apparatus>svg{max-height:270px}.titration-apparatus>p{margin-top:0}.titration-metrics strong{font-size:27px}}
@media(max-width:780px){.titration-mobile-dose{display:flex;align-items:center;gap:15px;margin-top:20px}.titration-mobile-dose .btn{font-size:14px;flex:1}.titration-mobile-dose output{font-size:16px;white-space:nowrap}.laboratory-room{min-height:500px;border-radius:20px}.laboratory-room>img{object-position:55% 50%}.lab-room-hotspot{left:20px;right:20px;max-width:none;padding:18px;gap:12px}.hotspot-experiments{top:22%}.hotspot-titration{top:54%}.lab-room-hotspot strong{font-size:20px}.lab-room-caption{left:23px;right:23px;bottom:23px;font-size:12px}.lab-room-hotspot>span>span{font-size:12px}.hotspot-dot{width:40px;height:40px}.lab-room-credit{font-size:10px}.titration-layout{grid-template-columns:1fr;gap:0}.titration-intro h2{font-size:23px}.titration-intro p,.titration-intro li{font-size:14px}.titration-intro .titration-equation{font-size:19px;overflow-wrap:anywhere}.titration-controls .tool-field{font-size:14px}.titration-metrics strong{font-size:28px}.titration-visual-grid{margin-top:20px}.titration-apparatus>svg{max-height:240px}.immersive-toolbar{padding:10px 13px;gap:10px}.immersive-toolbar>strong{font-size:13px}.immersive-toolbar .btn{font-size:13px;padding:10px 14px}.exam-guide-card{padding:19px 16px;gap:13px;align-items:flex-start}.exam-guide-card h2{font-size:18px}.exam-guide-card p{font-size:13px}.exam-guide-number{width:36px;height:36px;font-size:18px;border-radius:9px}.exam-guide-card>svg{width:15px;margin-top:10px}.exam-guide-article h1{font-size:30px}.exam-guide-body h2{font-size:23px}.exam-guide-body p,.exam-guide-body li{font-size:15px;line-height:1.95}.exam-guide-pitfall{padding:18px}.exam-guide-paging .btn{font-size:13px;padding:12px 16px}.exam-guide-summary{padding:22px}.exam-guide-summary>h2{font-size:24px}.exam-guide-inline h2{font-size:21px}.exam-guide-inline p,.exam-guide-inline li{font-size:14px}.theory-exam-sections{gap:8px}.theory-exam-sections>a{font-size:13px;padding:10px 12px}}
@media(prefers-reduced-motion:reduce){.titration-droplet{animation:none!important}.titration-tube-fill,.titration-sample{transition:none}}