.studio-top{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:16px}.studio-kicker{font-size:11px;color:#8c75a5;letter-spacing:1px;text-transform:uppercase}.studio-title{font-size:26px;margin:8px 0 18px;line-height:1.4}.studio-layout{display:grid;grid-template-columns:235px minmax(0,1fr);gap:18px;align-items:start}.studio-panel{background:#fff;border:1px solid #e1ddeb;border-radius:13px;padding:18px}.studio-panel h2{font-size:16px}.studio-field{display:block;margin:12px 0}.studio-field>span{display:block;font-size:12px;color:#6e6281;margin-bottom:5px}.studio-field select,.studio-field input[type=number]{font:inherit;font-size:12px;padding:9px;border:1px solid #d4c8e5;background:white;border-radius:7px;width:100%;min-width:0}.studio-actions{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.studio-actions button{background:#f7f3fc;color:#65517f;border:1px solid #cdbddf;padding:9px 11px;border-radius:8px;font-size:12px}.studio-actions button:disabled{opacity:.45;cursor:default}.studio-actions button.on{background:#735894;color:white}.studio-stage{background:white;border:1px solid #ded9e9;border-radius:14px;overflow:hidden}.studio-dose{display:flex;gap:10px;align-items:center;justify-content:space-between;background:#f2edf9;padding:12px 16px;border-bottom:1px solid #e0d6ec}.studio-dose strong{font-size:14px}.studio-dose .studio-actions{margin:0}.studio-scene svg{display:block;width:100%;height:325px;font:13px Arial,sans-serif;fill:#4f5571}.studio-timeline{padding:12px 18px;background:#faf8ff;border-top:1px solid #e8e2f0}.studio-timeline label{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#65527c}.studio-timeline input{width:100%;accent-color:#8b6ab0;margin-top:10px}.studio-state{padding:10px 16px;background:#f4f7fa;border-top:1px solid #e1e8ef;font-size:13px;color:#506378;line-height:1.7}.studio-equations{display:flex;flex-wrap:wrap;gap:9px;padding:12px 15px;border-top:1px solid #e3dfec}.studio-equations>div{flex:1 1 125px;background:#f6f4fb;padding:10px;border:1px solid #e2dced;border-radius:8px;font-size:12px;line-height:1.7}.studio-equations b{display:block;color:#51426f}.studio-equations strong{display:block;font-size:19px;color:#66517f}.studio-wide{margin-top:16px}.studio-note{font-size:12px!important;line-height:1.8;color:#6c6380!important}.studio-formula{background:#f4f1fb;padding:13px;border-radius:9px;font-size:13px;color:#5c4b7c;line-height:1.9;overflow-wrap:anywhere;margin:12px 0}.studio-data{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;margin-top:15px}.studio-table{border-collapse:collapse;width:100%;font-size:11px;table-layout:fixed}.studio-table th,.studio-table td{border-bottom:1px solid #e5e0ed;padding:7px;text-align:left;overflow-wrap:anywhere}.studio-table th{background:#f5f1fa;color:#625174}.studio-chart svg{width:100%;height:210px;display:block;font:11px Arial;fill:#62697f}.studio-legend{display:flex;gap:15px;font-size:11px;color:#655872}.studio-legend span::before{content:'';display:inline-block;width:15px;height:3px;background:var(--trace);vertical-align:middle;margin-right:5px}.studio-controls-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.studio-halves{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.studio-warning{background:#fff0e9;border-left:3px solid #cb8b69;padding:12px;color:#8a5f4e;font-size:12px;border-radius:8px;margin:10px 0}.studio-balance{background:#eaf1f5;border:1px solid #d4e0e8;border-radius:8px;padding:12px;font-size:15px;text-align:center;color:#425f76}.studio-subtitle{font-size:12px;color:#776b88;margin:7px 0}.studio-particle-solid{animation:studioJiggle .22s infinite alternate}.studio-particle-liquid{animation:studioDrift 2.3s infinite alternate}.studio-particle-gas{animation:studioDrift .65s infinite alternate}.studio-charge{animation:studioCharge 1.4s linear infinite}.studio-smoke{animation:studioSmoke 1.5s infinite}.studio-foam{fill:white;stroke:#b6d1db}.studio-boom{fill:#e8ab63;stroke:#c9634f;stroke-width:3}.studio-reference{font-size:11px;color:#7c738a;margin-top:16px;line-height:1.8}.studio-reference a{color:#7a5aa0;margin-right:10px}@keyframes studioJiggle{to{transform:translate(1px,-1px)}}@keyframes studioDrift{to{transform:translate(13px,-9px)}}@keyframes studioCharge{to{stroke-dashoffset:-28}}@keyframes studioSmoke{to{transform:translateY(-35px);opacity:0}}@media(max-width:950px){.studio-layout{grid-template-columns:1fr}.studio-data{grid-template-columns:1fr}.studio-scene svg{height:290px}.studio-controls-row{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:500px){.studio-panel{padding:14px}.studio-title{font-size:22px}.studio-scene svg{height:260px}.studio-dose{padding:10px;flex-wrap:wrap}.studio-equations{padding:10px}.studio-equations>div{flex-basis:105px}.studio-halves{gap:7px}.studio-field select{font-size:11px}.studio-controls-row{gap:7px}.studio-table th,.studio-table td{padding:5px;font-size:10px}}@media(prefers-reduced-motion:reduce){.studio-particle-solid,.studio-particle-liquid,.studio-particle-gas,.studio-charge,.studio-smoke{animation:none}}

.studio-phase-stops{display:flex;justify-content:space-between;gap:8px;padding:6px 14px;background:#faf8ff;font-size:10px;color:#79688a}.studio-phase-stops span{max-width:30%;line-height:1.5}.studio-stir{transform-origin:277px 100px;animation:studioStir 1s ease-in-out infinite alternate}@keyframes studioStir{to{transform:rotate(-7deg)}}@media(prefers-reduced-motion:reduce){.studio-stir{animation:none}}

.studio-comparison-layout{grid-template-columns:1fr}.studio-comparison-layout>.studio-panel .studio-halves{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.studio-comparison-layout>.studio-panel .studio-halves>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}.studio-comparison-layout .studio-halves h2{grid-column:1/-1}.studio-comparison-layout>.studio-panel .studio-field{margin:8px 0}@media(max-width:500px){.studio-comparison-layout>.studio-panel .studio-halves>div{grid-template-columns:1fr}.studio-comparison-layout>.studio-panel .studio-halves{gap:10px}}

.studio-phase-track{position:relative;margin-top:10px}.studio-phase-track input{position:relative;z-index:2;margin:4px 0 0;height:22px;display:block}.studio-plateau-band{position:absolute;top:6px;height:16px;background:#d6c5ed;border-left:2px solid #a38bc0;border-right:2px solid #a38bc0;border-radius:3px;z-index:1;pointer-events:none}.studio-phase-markers{position:relative;height:60px;margin:0 0 3px}.studio-phase-markers>span{position:absolute;transform:translateX(-50%);top:4px;text-align:center;font-size:11px;color:#71558c;line-height:1.4;max-width:39%;width:180px}.studio-phase-markers b,.studio-phase-markers small{display:block}.studio-phase-markers small{font-size:10px;color:#8b7b9d}.studio-phase-timeline label strong{color:#695184;font-size:15px}

.studio-phase-point{position:absolute;top:-4px;height:38px;border-left:3px solid #675080;z-index:3;pointer-events:none}.studio-phase-track{margin-left:8px;margin-right:8px}.studio-phase-markers{margin-left:8px;margin-right:8px}

.studio-group-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.studio-group-grid>div{min-width:0}.studio-group-grid h2{text-align:center;margin:0;font-size:20px}.studio-scene .studio-group-grid svg{width:100%;height:auto;min-height:190px}.studio-group-grid svg text{font-size:16px}@media(max-width:650px){.studio-group-grid{grid-template-columns:1fr}.studio-scene .studio-group-grid svg{max-height:270px}}

/* C4 comparisons retain a side-by-side arrangement on every screen. */
.studio-group-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.studio-scene .studio-group-grid svg{min-height:0;height:auto}.studio-group-grid svg text{font-size:19px}@media(max-width:650px){.studio-group-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}.studio-group-grid h2{font-size:14px}.studio-scene .studio-group-grid svg{height:auto;max-height:none}.studio-group-grid svg text{font-size:22px}}

.studio-litmus-dip{animation:studioLitmusDip 1.1s ease-out both}.studio-litmus-strip{fill:#dd7385;animation:studioLitmusBlue .5s 1.05s linear forwards}@keyframes studioLitmusDip{from{transform:translateY(-70px)}to{transform:translateY(0)}}@keyframes studioLitmusBlue{to{fill:#5b7de0}}@media(prefers-reduced-motion:reduce){.studio-litmus-dip{animation:none}.studio-litmus-strip{animation:none;fill:#5b7de0}}

.studio-halogen-litmus{fill:#6282d0}.studio-halogen-Cl{animation:studioHalogenRed .45s 1.1s forwards,studioHalogenWhite .7s 2.1s forwards}.studio-halogen-Br{animation:studioHalogenRed .45s 1.1s forwards}.studio-acidbase-litmus{fill:var(--litmus-start);animation:studioAcidbaseColour .5s 1.1s forwards}@keyframes studioHalogenRed{to{fill:#db6c82}}@keyframes studioHalogenWhite{to{fill:#fff}}@keyframes studioAcidbaseColour{to{fill:var(--litmus-end)}}@media(prefers-reduced-motion:reduce){.studio-halogen-Cl{animation:none;fill:#fff}.studio-halogen-Br{animation:none;fill:#db6c82}.studio-acidbase-litmus{animation:none;fill:var(--litmus-end)}}

/* HOBr bleaching follows the initial acidic colour change, more slowly than HOCl. */
.studio-halogen-Br{animation:studioHalogenRed .45s 1.1s forwards,studioHalogenWhite 1.5s 4s forwards}@media(prefers-reduced-motion:reduce){.studio-halogen-Br{animation:none;fill:#fff}}

.studio-halogen-I{animation:studioHalogenRed .45s 1.1s forwards}@media(prefers-reduced-motion:reduce){.studio-halogen-I{animation:none;fill:#db6c82}}

/* Phase setup, slider, proportions and plot form one compact teaching panel. */
.studio-phase-layout .studio-scene svg{height:220px}.studio-phase-layout .studio-phase-timeline{padding:7px 16px 0}.studio-phase-layout .studio-phase-markers{height:47px}.studio-phase-layout .studio-phase-markers small{display:none}.studio-phase-layout .studio-equations{display:block;padding:0;border-top:0}.studio-phase-layout .studio-equations>.studio-phase-proportions{display:grid;grid-template-columns:repeat(3,1fr);padding:4px 16px;margin:0;border:0;border-radius:0;background:#faf8ff;text-align:center;line-height:1.2}.studio-phase-proportions b{font-size:13px}.studio-phase-proportions strong{font-size:16px!important;margin-top:3px}.studio-phase-layout .studio-equations>.studio-phase-inline-graph{margin:0;padding:2px 10px;background:white;border:0;border-radius:0}.studio-phase-inline-graph .studio-chart{margin:0}.studio-phase-inline-graph .studio-chart svg{display:block;width:100%;height:190px}.studio-phase-inline-graph .studio-legend{display:none}.studio-phase-layout .studio-state{font-size:12px;padding:6px 12px;line-height:1.4}.studio-phase-layout .studio-wide{margin-top:8px}@media(max-height:800px) and (min-width:951px){.studio-phase-layout .studio-scene svg{height:185px}.studio-phase-inline-graph .studio-chart svg{height:165px}}

.studio-setup-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:8px 16px;padding:10px 16px;background:#faf8ff;border-bottom:1px solid #e4ddec}.studio-setup-controls .studio-field{margin:0}.studio-setup-controls>.studio-halves{grid-column:1/-1}.studio-setup-controls .studio-note{grid-column:1/-1;margin:0}.studio-setup-controls .studio-field>span{font-weight:600}@media(max-width:500px){.studio-setup-controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:10px}}

.studio-solvent-options{display:flex;gap:6px;flex-wrap:wrap}.studio-solvent-options button{min-width:78px}.studio-litmus-retained .studio-acidbase-litmus{animation-delay:0s}

.studio-ph-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.studio-ph-grid>div{min-width:0;text-align:center}.studio-ph-grid h2{margin:8px 0 3px;font-size:18px}.studio-ph-grid p{font-size:12px;margin:0 0 4px}.studio-scene .studio-ph-grid svg{width:100%;height:auto}.studio-ph-grid svg text{font-size:25px}@media(max-width:600px){.studio-ph-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* Each pH apparatus is a self-contained box; retain all four for direct comparison. */
.studio-ph-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;padding:8px}.studio-ph-box{border:1px solid #ded8e9;border-radius:12px;overflow:hidden;background:#f5f7fb}.studio-ph-box-title{padding:9px 3px 0;min-height:62px}.studio-ph-grid h2{font-size:clamp(12px,1.6vw,19px);overflow-wrap:normal;white-space:nowrap}.studio-ph-grid p{font-size:clamp(9px,1vw,12px);line-height:1.4}.studio-ph-grid svg text{font-size:26px}@media(max-width:600px){.studio-ph-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:4px}.studio-ph-box-title{min-height:58px}.studio-ph-grid h2{font-size:11px}.studio-ph-grid p{font-size:9px}}

.studio-sample-options{display:flex;gap:7px;flex-wrap:wrap}.studio-sample-options button{min-width:110px}.studio-ion-unit text{pointer-events:none}

.studio-reset-panel{padding:9px 12px}.studio-reset-panel>.studio-actions{margin:3px 0}.studio-reset-panel>.studio-note{margin:4px 0 0;line-height:1.4}.studio-reset-panel>.studio-field{margin:7px 0}.studio-comparison-layout>.studio-reset-panel{display:flex;align-items:center;gap:8px 14px;flex-wrap:wrap}.studio-comparison-layout>.studio-reset-panel>.studio-note{margin:0}.studio-comparison-layout>.studio-reset-panel>.studio-actions{margin:0}

.studio-set-1{color:#2878d0!important}.studio-set-2{color:#d64b50!important}.studio-rate-control-table .studio-field>span{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.studio-rate-control-table .studio-field{margin:0!important}.studio-rate-control-table th:first-child{width:9%}.studio-rate-control-table select{width:100%;padding:7px 3px;font-size:12px}.studio-rate-control-table th,.studio-rate-control-table td{padding:6px 4px}.studio-rate-control-table .studio-set-1 select{border-color:#9cc2ed}.studio-rate-control-table .studio-set-2 select{border-color:#e5a7aa}.studio-rate-control-table{flex:1 1 100%}

.studio-insoluble-message{padding:7px 10px;background:#fff0e4;border:1px solid #e6b28b;border-radius:8px;color:#8a5037;font-weight:600;line-height:1.5}

.studio-process-controls{background:#faf8ff;border:1px solid #ded9e9;border-radius:10px;padding:8px 14px;margin-bottom:10px}.studio-process-controls .studio-field{margin:0;max-width:340px}

.studio-setup-controls>.studio-salt-selectors{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.studio-salt-selectors .studio-field{margin:0}

.studio-hydrocarbon-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:10px}.studio-hydrocarbon-grid>div{min-width:0;border:1px solid #ded9e9;border-radius:12px;overflow:hidden;background:#f5f7fb;text-align:center}.studio-hydrocarbon-grid h2{font-size:19px;margin:12px 0 0}.studio-scene .studio-hydrocarbon-grid svg{height:auto;width:100%;max-height:300px}.studio-hydrocarbon-grid p{padding:0 8px 8px;font-size:12px}

.studio-learning-notes{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}.studio-learning-notes>div{padding:16px;background:#f7f4fc;border:1px solid #e4dcef;border-radius:10px}.studio-learning-notes h2{font-size:15px;margin:0 0 8px}.studio-learning-notes p{font-size:13px;line-height:1.65}.studio-learning-notes .studio-help-zh{border-top:1px solid #e4dcef;padding-top:8px;color:#655575}@media(max-width:700px){.studio-learning-notes{grid-template-columns:1fr}}

.studio-observation-table{margin:0 0 18px;max-width:100%}.studio-observation-table table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13px;line-height:1.65}.studio-observation-table th,.studio-observation-table td{border:1px solid #ded6eb;padding:12px;text-align:left;vertical-align:top;overflow-wrap:anywhere}.studio-observation-table thead th{background:#eee7f8;color:#51416d}.studio-observation-table tbody th{background:#f7f4fb;width:20%}.studio-observation-table td{background:white}.studio-observation-table .studio-help-zh{margin:7px 0 0;color:#746381;font-size:12px}.studio-status-line+.studio-status-line{margin-top:10px;padding-top:10px;border-top:1px solid #e4dcef}.studio-status-line .studio-help-zh{display:block;margin-top:3px;font-size:12px}@media(max-width:600px){.studio-observation-table th,.studio-observation-table td{padding:8px;font-size:12px}}

.studio-observation-table tbody th{width:auto}.studio-observation-table table col:first-child{min-width:0}.studio-observation-table th[scope="row"]{font-size:12px;padding:10px 8px}

.studio-action-zh{display:block;font-size:11px;font-weight:400;line-height:1.45;margin-top:3px;opacity:.85}.studio-setup-zh{font-size:12px;line-height:1.5;color:#71627e;text-align:center;margin:6px 8px 0}

.studio-observation-table thead th:first-child{overflow-wrap:normal;word-break:normal}

.studio-lemon-choice{display:flex;align-items:center;gap:9px;padding:10px 12px;border:1px solid #ddcb79;border-radius:9px;background:#fff9df;font-size:13px;cursor:pointer}.studio-lemon-choice input{width:18px;height:18px;accent-color:#9b8235;flex-shrink:0}.studio-lemon-choice small{display:block;font-size:11px;margin-top:3px;color:#83704c}

.studio-electrolyte-lemon{display:flex;flex-direction:column;gap:8px;min-width:0}.studio-electrolyte-lemon .studio-lemon-choice{margin:0;padding:8px;font-size:12px}

.studio-voltaic-electrolytes{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 16px}.studio-cell-mode-row{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.studio-lemon-anode-choice{min-width:0}.studio-lemon-anode-choice>b{display:block;font-size:12px;color:#6e6281;margin-bottom:5px}.studio-lemon-anode-choice .studio-lemon-choice{margin:0}@media(max-width:600px){.studio-cell-mode-row{grid-template-columns:1fr}}

/* Three independent latex views use their actual card width, not one shrunken SVG. */
.studio-latex-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:10px}.studio-latex-box{min-width:0}.studio-scene .studio-latex-grid svg{width:100%;height:auto;display:block}
@media(min-width:951px){
 .studio-layout{grid-template-columns:200px minmax(0,1fr);gap:14px}.studio-comparison-layout{grid-template-columns:1fr}
 .studio-layout:not(.studio-phase-layout) .studio-scene>svg{height:clamp(264px,25.8vw,360px);width:100%}
 .studio-reset-panel{padding:10px 12px}.studio-reset-panel>.studio-field>span{font-size:13px}.studio-reset-panel .studio-actions button{font-size:13px}
 .studio-setup-controls .studio-field>span{font-size:14px}.studio-field select,.studio-field input[type=number]{font-size:14px}
 .studio-dose strong{font-size:15px}.studio-actions button{font-size:14px;padding:10px 13px}.studio-state{font-size:15px}
 .studio-scene .studio-hydrocarbon-grid svg{max-height:264px}.studio-latex-grid{gap:16px;padding:14px}.studio-scene .studio-latex-grid svg{height:clamp(276px,25.2vw,354px);max-height:none}
 .studio-timeline label{font-size:14px}.studio-timeline input{min-height:24px}
}
@media(max-width:650px){.studio-latex-grid{gap:3px;padding:4px}}

/* Larger apparatus and charts, with Reset consistently beside Setup. */
.studio-setup-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 14px;background:#faf8ff;border-bottom:1px solid #e8e2f0}.studio-setup-header button{font:inherit;font-size:13px;padding:7px 10px;color:#65517f;background:#fff;border:1px solid #cdbddf;border-radius:8px}.studio-setup-header small{display:none}.studio-scene svg{height:423px}.studio-chart svg{min-height:280px}.studio-phase-layout .studio-scene svg{height:286px}.studio-phase-inline-graph .studio-chart svg{height:247px;min-height:247px}.studio-phase-play{margin:0;padding:8px 16px}.studio-phase-particle{transform-box:fill-box;transform-origin:center;animation:phase-vibration .36s ease-in-out infinite alternate}@keyframes phase-vibration{from{transform:translate(calc(-1 * var(--vibration)),.5px)}to{transform:translate(var(--vibration),-.5px)}}
@media(min-width:951px){.studio-layout:not(.studio-phase-layout) .studio-scene>svg{height:clamp(343px,33.54vw,468px)}.studio-scene .studio-hydrocarbon-grid svg{max-height:343px}.studio-scene .studio-latex-grid svg{height:clamp(359px,32.76vw,460px)}.studio-phase-layout .studio-scene svg{height:286px}.studio-phase-inline-graph .studio-chart svg{height:247px}.studio-scene svg text{font-size:15px}.studio-chart svg text{font-size:12px}}
@media(prefers-reduced-motion:reduce){.studio-phase-particle{animation:none}}

/* Reset sits inside the apparatus frame rather than a separate header row. */
.studio-scene,.salt-apparatus{position:relative}.studio-apparatus-reset{position:absolute;top:10px;right:12px;z-index:3}.studio-apparatus-reset button{font:inherit;font-size:12px;line-height:1.3;padding:7px 10px;background:#fffffff0;color:#65517f;border:1px solid #cdbddf;border-radius:8px;box-shadow:0 2px 5px #55446b0b}.studio-apparatus-reset small{display:none}.studio-apparatus-reset+svg{margin-top:35px}.studio-apparatus-reset+.studio-latex-grid,.studio-apparatus-reset+.studio-hydrocarbon-grid,.studio-apparatus-reset+.studio-ph-grid{padding-top:42px}

/* Keep comparison panels close instead of spreading across a wide screen. */
.studio-scene .studio-latex-grid{width:100%;max-width:800px;margin-inline:auto;gap:6px;padding-inline:4px}.studio-scene .studio-group-grid{width:100%;max-width:960px;margin-inline:auto;gap:6px}.studio-scene .studio-hydrocarbon-grid{width:100%;max-width:920px;margin-inline:auto;gap:6px;padding-inline:4px}.studio-scene .studio-ph-grid{width:100%;max-width:1040px;margin-inline:auto;gap:6px}@media(max-width:650px){.studio-scene .studio-latex-grid,.studio-scene .studio-group-grid,.studio-scene .studio-hydrocarbon-grid,.studio-scene .studio-ph-grid{gap:3px}}

/* Reset belongs at the far right of the operation box. */
.studio-dose .studio-actions{flex:1}.studio-inline-reset{margin-left:auto!important;align-self:center;white-space:nowrap}.studio-setup-controls>.studio-inline-reset{grid-column:-2/-1;justify-self:end}.studio-phase-play{display:none}.salt-acid-bar>.studio-inline-reset{font:inherit;padding:8px 12px;color:#65517f;background:#fff;border:1px solid #cdbddf;border-radius:8px}.salt-acid-bar{flex-wrap:wrap}

.studio-inline-reset{font-size:23px!important;line-height:1!important;min-width:38px;min-height:36px;padding:6px 9px!important}

/* Operations get a full-width row; Reset stays anchored at its right edge. */
.studio-dose{display:block;padding:9px 12px}.studio-dose>strong{display:block;max-width:150px;line-height:1.3;margin-bottom:7px}.studio-dose>.studio-actions{position:relative;display:flex;flex-wrap:wrap;gap:7px;padding-right:47px;min-height:38px;width:100%;margin:0}.studio-dose .studio-inline-reset{position:absolute;right:0;top:0;margin:0!important}.studio-sample-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;width:100%}.studio-sample-options button{min-width:0;margin:0!important}.studio-solvent-options{display:flex;flex-wrap:wrap;gap:6px}.studio-scene{min-height:0;padding:0}.studio-scene>svg{display:block;margin:0 auto}.studio-setup-zh{margin:0;padding:7px 12px;line-height:1.4}
/* Long combustion tubes need one large comparison per row. */
.studio-scene .studio-combustion-stack{grid-template-columns:1fr;max-width:800px;gap:8px;padding:8px}.studio-combustion-stack>div{min-width:0;background:#f5f7fb;border:1px solid #e1ddeb;border-radius:10px;padding:7px}.studio-combustion-stack h2{text-align:left;padding-left:12px}.studio-scene .studio-combustion-stack svg{width:100%;height:auto;max-height:none;min-height:0}
/* Avoid letterboxing around the comparison apparatus. */
.studio-layout .studio-scene[data-engine="rategas"]>svg,.studio-layout .studio-scene[data-engine="ratemass"]>svg,.studio-layout .studio-scene[data-engine="ratecross"]>svg{height:auto;max-height:none;min-height:0;width:100%}
@media(max-width:650px){.studio-setup-controls[data-engine^="heat"]{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.studio-setup-controls[data-engine^="heat"] .studio-field{min-width:0;margin:0}.studio-setup-controls[data-engine^="heat"] .studio-field>span{font-size:11px;line-height:1.4}.studio-setup-controls[data-engine^="heat"] select{font-size:12px;padding:7px 4px;width:100%;min-width:0}.studio-dose>strong{font-size:12px}.studio-dose .studio-actions button{font-size:12px;padding:8px 7px}.studio-scene .studio-combustion-stack{grid-template-columns:1fr;gap:6px}}

/* Shared spacing rules across the full experiment library. */
.studio-panel:empty,.studio-setup-controls:empty{display:none}.studio-setup-controls{align-items:end;gap:9px 12px;padding:12px}.studio-setup-controls .studio-field{margin:0;min-width:0}.studio-field select,.studio-field input{min-width:0;max-width:100%}.studio-panel{padding:14px}.studio-wide{margin-top:12px}.studio-state{padding:10px 14px}.studio-timeline{padding:10px 14px}.studio-result-grid{gap:10px}.studio-scene>svg{object-fit:contain}.studio-actions{align-items:center}.studio-dose .studio-actions>button:not(.studio-inline-reset){max-width:100%;white-space:normal}.studio-setup-controls>.studio-inline-reset{grid-column:auto;justify-self:end;margin-top:0!important}
@media(max-width:650px){.studio-setup-controls{gap:8px;padding:10px}.studio-panel{padding:12px}.studio-solvent-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));width:100%}.studio-dose>.studio-actions{column-gap:6px}.studio-dose .studio-actions button{overflow-wrap:normal}.studio-title{font-size:23px;margin-bottom:12px}}

/* C5 and alloy: size follows the trimmed artwork instead of a fixed-height canvas. */
.studio-layout .studio-scene[data-engine="conductivity"]>svg,.studio-layout .studio-scene[data-engine="alloy"]>svg{height:auto;min-height:0;max-height:none;width:100%;padding:0;margin:0;aspect-ratio:auto}.studio-scene[data-engine="conductivity"],.studio-scene[data-engine="alloy"]{min-height:0;padding:0}

/* Library-wide canvas audit: remove fixed-height letterboxing, keep diagram proportions. */
.studio-layout:not(.studio-phase-layout) .studio-scene>svg{width:100%;height:auto;min-height:0;max-height:none;max-width:1000px;margin-inline:auto;display:block}.studio-scene .studio-group-grid svg,.studio-scene .studio-hydrocarbon-grid svg,.studio-scene .studio-ph-grid svg,.studio-scene .studio-latex-grid svg{height:auto;min-height:0;max-height:none;display:block}.studio-scene .studio-latex-grid{max-width:800px}.studio-scene .studio-hydrocarbon-grid{max-width:920px}.studio-scene .studio-group-grid{max-width:960px}.studio-scene .studio-combustion-stack{max-width:800px}.studio-scene .studio-ph-grid{max-width:1040px}.studio-setup-zh:empty,.studio-state:empty,.studio-equations:empty{display:none}

/* Readability: SVG text is enlarged from authored sizes, table text +30%. */
.studio-table th,.studio-table td{font-size:18.2px;line-height:1.55}.studio-table .studio-help-zh,.studio-table small{font-size:15.6px}.studio-state,.studio-setup-zh{font-size:16.9px}.studio-layout .studio-scene[data-engine="rategas"]>svg,.studio-layout .studio-scene[data-engine="ratemass"]>svg,.studio-layout .studio-scene[data-engine="ratecross"]>svg{width:80%;max-width:800px;margin-inline:auto}.studio-combustion-stack>div{padding:0}.studio-scene .studio-combustion-stack{gap:5px;padding:4px}.studio-standard-procedure{padding-left:25px}.studio-standard-procedure li{padding:4px 0}.studio-standard-procedure .active{font-weight:700;color:#7656bc}
@media(max-width:650px){.studio-table th,.studio-table td{font-size:16.9px}.studio-table .studio-help-zh,.studio-table small{font-size:14.3px}.studio-table{table-layout:auto}.studio-standard-procedure{font-size:15px}}

.studio-standard-stream{stroke-dasharray:6 5;animation:standard-stream .7s linear infinite}.studio-standard-stir{transform-origin:140px 140px;animation:standard-stir .7s ease-in-out infinite alternate}.studio-standard-invert{transform-origin:390px 180px;animation:standard-invert 2.5s ease-in-out 2}@keyframes standard-stream{to{stroke-dashoffset:-22}}@keyframes standard-stir{to{transform:rotate(9deg)}}@keyframes standard-invert{50%{transform:rotate(180deg)}}@media(prefers-reduced-motion:reduce){.studio-standard-stream,.studio-standard-stir,.studio-standard-invert{animation:none}}
.studio-scene[data-engine="standard"]>svg{max-width:1100px}.studio-standard-procedure .studio-help-zh{display:block;font-size:14px;font-weight:normal}

.studio-observation-table table,.studio-observation-table th,.studio-observation-table td{font-size:16.9px;line-height:1.65}.studio-observation-table .studio-help-zh{font-size:15.6px}.studio-observation-table th,.studio-observation-table td{padding:12px 10px}

/* Standard solution uses the same persistent procedure-and-apparatus arrangement as salt preparation. */
.studio-layout:has(.standard-step-list){grid-template-columns:285px minmax(0,1fr);align-items:start}.standard-step-list{list-style:none;margin:12px 0 0;padding:0}.standard-step-list li{padding:0;margin:0 0 7px}.standard-step-list button{display:flex;align-items:flex-start;gap:9px;width:100%;text-align:left;font:inherit;font-size:14px;line-height:1.5;border:1px solid #ded7eb;border-radius:9px;padding:10px;background:#fff;color:#5d566d}.standard-step-list button:disabled{cursor:default}.standard-step-list .active button{border-color:#9e83c5;background:#f1ebfa;color:#564079;box-shadow:inset 3px 0 #9570d5}.standard-step-list .done button{background:#f3f8f5;border-color:#d5e4da;color:#476b59}.standard-step-list .pending button{color:#817b8b;background:#faf9fc}.standard-step-number{flex:none;min-width:20px;font-weight:bold}.standard-step-list .studio-help-zh{font-size:12px;display:block;margin-top:4px}.standard-operation-status{font-size:15px;color:#7656bc;font-weight:bold}
@media(max-width:950px){.studio-layout:has(.standard-step-list){grid-template-columns:1fr}.standard-step-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.standard-step-list li{margin:0}.standard-step-list button{height:100%;font-size:13px}}@media(max-width:450px){.standard-step-list{grid-template-columns:1fr}}

/* Observation text -20% from the last preview; apparatus SVG labels +20% separately. */
.studio-observation-table table,.studio-observation-table th,.studio-observation-table td{font-size:13.52px}.studio-observation-table .studio-help-zh{font-size:12.48px}.studio-table.studio-observation-data th,.studio-table.studio-observation-data td{font-size:14.56px}.studio-table.studio-observation-data .studio-help-zh,.studio-table.studio-observation-data small{font-size:12.48px}
@media(max-width:650px){.studio-table.studio-observation-data th,.studio-table.studio-observation-data td{font-size:13.52px}.studio-table.studio-observation-data .studio-help-zh,.studio-table.studio-observation-data small{font-size:11.44px}}

/* Desktop-only apparatus reduction; compensate SVG label scale to preserve legibility. */
@media(min-width:951px){
 .studio-layout .studio-scene>svg{width:80%;height:auto;min-height:0;max-height:none;max-width:640px;--apparatus-label-scale:1.25;margin-inline:auto}
 .studio-layout .studio-scene[data-engine="conductivity"]>svg{width:80%;max-width:560px}
 .studio-layout .studio-scene[data-engine="standard"]>svg{max-width:700px}
 .studio-layout .studio-scene[data-engine="rategas"]>svg,.studio-layout .studio-scene[data-engine="ratemass"]>svg,.studio-layout .studio-scene[data-engine="ratecross"]>svg{width:64%;max-width:640px}
 .studio-scene .studio-latex-grid{width:80%;max-width:640px}
 .studio-scene .studio-group-grid{width:80%;max-width:768px}
 .studio-scene .studio-combustion-stack{width:64%;max-width:512px}
 .studio-scene .studio-hydrocarbon-grid{width:80%;max-width:736px}
 .studio-scene .studio-ph-grid{width:80%;max-width:832px}
 .studio-scene .studio-group-grid svg,.studio-scene .studio-latex-grid svg,.studio-scene .studio-hydrocarbon-grid svg,.studio-scene .studio-ph-grid svg{--apparatus-label-scale:1.25}
}

/* O₂ / Cl₂ comparisons: 20% smaller on phones and tablets as well. */
@media(max-width:950px){.studio-scene .studio-combustion-stack{width:80%;max-width:640px;margin-inline:auto}}

/* Solid ions vibrate about fixed lattice sites; each charge stays with its ion. */
.studio-solid-lattice .studio-lattice-ion{animation:studioLatticeVibration .28s ease-in-out infinite alternate;animation-delay:var(--lattice-delay,0s)}
@keyframes studioLatticeVibration{from{transform:translate(-.65px,.35px)}to{transform:translate(.65px,-.35px)}}
@media(prefers-reduced-motion:reduce){.studio-solid-lattice .studio-lattice-ion{animation:none}}