:root{font:15px 'Segoe UI',Arial,sans-serif;color:#223748;background:#e2f4ff;color-scheme:light;--border:#a5c7db;--purple:#895bc4}*{box-sizing:border-box}body{margin:0;padding:env(safe-area-inset-top) max(12px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(12px,env(safe-area-inset-left))}header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding:18px 8px}header a{color:#425b74;text-decoration:none;padding:12px 0}h1{font-size:21px;letter-spacing:.5px;margin:0}header p{margin:6px 0 0;color:#7650a3}button,summary{min-height:44px;border:1px solid var(--border);border-radius:9px;padding:10px 12px;background:white;color:#223748;font:inherit;cursor:pointer;touch-action:manipulation}button:hover{background:#eef6fb}button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #895bc4;outline-offset:2px}button:disabled{opacity:.45;cursor:default}.toolbar{display:flex;flex-wrap:wrap;gap:6px}#reset{background:#eb5d3a;color:white;border-color:#eb5d3a}main{display:grid;grid-template-columns:280px minmax(260px,1fr) 240px;gap:14px;max-width:1500px;margin:auto}.panel{background:white;border:1px solid var(--border);border-radius:16px;padding:20px;box-shadow:0 6px 18px #62889c0c}h2{font-size:16px;margin:0 0 18px;border-bottom:1px solid #d5e4ee;padding-bottom:14px}.controls{position:relative}details{position:relative;margin-bottom:20px}summary{background:var(--purple);color:white;font-weight:600}.mode-options{position:absolute;top:100%;left:0;right:0;background:white;padding:6px;box-shadow:0 8px 24px #22374835;border-radius:10px;z-index:2}.mode-options button{display:block;width:100%;margin:3px 0;text-align:left}.mode-options button[aria-pressed=true]{background:#ede5f8}fieldset{margin:0 0 24px;border:0;padding:0}legend{padding:0;margin-bottom:10px}.device-buttons{display:flex;gap:4px;margin-bottom:18px}.device-buttons button{flex:1;font-size:12px;padding:7px 4px}.device-buttons button[aria-pressed=true]{background:var(--purple);color:white}label{display:flex;flex-wrap:wrap;align-items:center;gap:8px;justify-content:space-between;font-size:14px;margin:16px 0 8px}label span{white-space:nowrap}input[type=number]{width:80px;min-height:40px;border:1px solid var(--border);border-radius:7px;padding:6px;font:inherit;font-size:16px;color:#223748;background:#f4f9fc}input[type=range]{width:100%;height:30px;accent-color:#895bc4;margin:0;touch-action:pan-y}.bounds{display:flex;justify-content:space-between;font-size:11px;color:#5c7182}#release{margin-top:8px;width:100%;font-size:12px}.hint{padding:12px;background:#f1ebf9;border-radius:8px;color:#71539a;font-size:13px}#limit{color:#b34b26;font-size:12px;min-height:16px}.apparatus{display:flex;flex-direction:column;min-width:0;min-height:560px}#apparatus{width:100%;height:100%;min-height:480px;flex:1;display:block}.scene-caption{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;color:#5c7182;padding:10px;font-size:13px}.scene-caption span:first-child{color:#895bc4;font-size:18px;font-weight:600}.readout{margin-bottom:20px}.readout>span{display:block;color:#5c7182;font-size:13px}.readout strong{display:block;font-size:27px;color:#2c91d6;font-variant-numeric:tabular-nums;margin-top:4px}.temperature strong{color:#eb5d3a}.readout small{color:#5c7182}meter{display:block;width:100%;height:25px;margin-top:10px}#gauge{display:block;width:100%;max-height:155px;margin:auto}#gauge text{font-size:13px;fill:#5c7182}.domain,#outside{font-size:12px;line-height:1.7;color:#5c7182}.graphs{max-width:1500px;margin:18px auto}.graph-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.graph-heading h2{border:0;margin:0;padding:0}.graph-heading p{font-size:12px;color:#5c7182}.chart-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}figure{margin:0;background:#f8fbfd;border:1px solid #d5e4ee;border-radius:10px;padding:10px;min-width:0}figcaption{font-weight:600;font-size:13px}figure canvas{width:100%;height:220px;display:block}#sample-count,footer{font-size:12px;color:#5c7182}footer{max-width:1500px;margin:16px auto;line-height:1.7}[hidden]{display:none!important}@media(max-width:1050px){main{grid-template-columns:240px minmax(240px,1fr)}.readings{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:18px;align-items:start}.readings h2{width:100%;margin:0}.readout{flex:1;min-width:140px;margin:0}#gauge{max-height:100px}.readings>p{flex:1;min-width:150px}}@media(max-width:650px){body{padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}header{gap:10px;padding:10px 4px}h1{font-size:17px}header p{font-size:12px}.toolbar{width:100%}.toolbar button{flex:1;padding:8px;font-size:12px}main{display:flex;flex-direction:column;gap:10px}.apparatus{order:-1;min-height:360px;height:420px}#apparatus{min-height:340px}.controls,.readings{padding:16px}.chart-grid{grid-template-columns:1fr}.readout strong{font-size:24px}.graphs{padding:12px}.graph-heading{align-items:start}.graph-heading button{font-size:12px;flex-shrink:0}.readings{display:grid;grid-template-columns:1fr 1fr}.readings h2{grid-column:1/-1}.readings .readout,.readings>p{min-width:0}.domain{grid-column:1/-1}.device-buttons button{font-size:14px}.scene-caption{padding:4px}.controls>h2{margin-bottom:12px}figure canvas{height:200px}}

@media(max-width:650px){.apparatus{position:sticky;top:env(safe-area-inset-top);z-index:1;background:#e2f4ff;height:310px;min-height:310px}#apparatus{min-height:265px}.scene-caption{font-size:11px}.scene-caption span:first-child{font-size:15px}}

/* Observation workspace: apparatus and selected live chart stay together. */
main{height:calc(100dvh - var(--header-height,100px) - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 12px);min-height:340px;grid-template-columns:240px minmax(0,1fr) 190px;align-items:stretch}
.controls,.readings{min-height:0;overflow:auto;padding:14px}.observation{min-width:0;min-height:0;display:grid;grid-template-columns:1fr;gap:10px}.observation.with-graphs{grid-template-columns:minmax(0,1fr) minmax(240px,1fr)}
.observation .apparatus{position:static;height:auto;min-height:0;order:0}.observation #apparatus{min-height:0;height:0;flex:1}.scene-caption{gap:6px;padding:5px;font-size:11px}.scene-caption span:first-child{font-size:15px}
.observation .graphs{margin:0;width:100%;min-width:0;min-height:0;padding:12px;display:flex;flex-direction:column;overflow:hidden}.graph-heading{align-items:flex-start;gap:5px}.graph-heading h2{font-size:14px}.graph-heading p{font-size:11px;margin:5px 0}.graph-heading button{font-size:11px;padding:6px}.chart-tabs{display:flex;gap:5px;margin:8px 0}.chart-tabs button{flex:1;padding:6px}.chart-tabs button[aria-pressed=true]{background:#895bc4;color:white;border-color:#895bc4}.chart-grid{display:block;flex:1;min-height:0}.chart-grid figure{height:100%;display:flex;flex-direction:column;padding:6px}.chart-grid figcaption{font-size:12px}.chart-grid canvas{height:0;min-height:100px;flex:1}.graphs #sample-count{font-size:10px;margin:6px 0 0}.readings .readout{min-width:0}.readings strong{font-size:23px}
@media(max-width:1100px) and (min-width:651px){main{grid-template-columns:210px minmax(0,1fr)}.readings{grid-column:auto;display:none}.observation.with-graphs{grid-template-columns:minmax(0,1fr) minmax(220px,1fr)}}
@media(max-width:650px){main{height:auto;min-height:0;display:flex}.observation{order:-1;position:sticky;top:env(safe-area-inset-top);z-index:1;background:#e2f4ff;height:310px;flex:none}.observation.with-graphs{grid-template-columns:1fr;grid-template-rows:minmax(130px,1fr) 220px;height:min(560px,calc(100dvh - var(--header-height,160px) - 10px));min-height:370px;gap:4px}.observation .graphs{padding:7px}.graph-heading h2{display:none}.graph-heading p{margin:0;font-size:10px}.graph-heading button{min-height:32px}.chart-tabs{margin:3px 0}.chart-tabs button{min-height:36px}.graphs #sample-count{display:none}.chart-grid canvas{min-height:80px}.scene-caption{padding:0}.readings{display:grid;overflow:visible}.controls{overflow:visible}.chart-grid figcaption{display:none}}
@media(max-height:500px) and (min-width:651px){header{padding:5px;gap:5px}header h1{font-size:15px}header p{font-size:11px}main{min-height:230px}.graph-heading h2{display:none}.graphs #sample-count{display:none}}
@media(max-width:1100px) and (min-width:651px){main{grid-template-rows:minmax(0,1fr) 110px}.readings{display:flex;grid-column:1/-1;max-height:110px;gap:12px}.readings h2{display:none}.readings .readout{margin:0;min-width:100px}.readings #gauge{display:none}.readings>p{min-width:140px;margin:0}}

/* All three plots sit below the experiment, visible together. */
.observation.with-graphs{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(150px,1fr) 240px}
.observation .graphs{padding:8px}.chart-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;min-height:0}.chart-grid figure{padding:5px}.chart-grid figcaption{font-size:10px}.chart-grid canvas{min-height:80px}.graph-heading h2{font-size:12px}.graph-heading p{font-size:10px;margin:2px 0}.graph-heading button{min-height:32px}.graphs #sample-count{font-size:9px;margin:3px 0 0}
@media(max-width:650px){.observation.with-graphs{grid-template-columns:1fr;grid-template-rows:minmax(140px,1fr) 185px;height:min(560px,calc(100dvh - var(--header-height,160px) - 10px));min-height:340px}.chart-grid{gap:3px}.chart-grid figure{padding:2px}.chart-grid figcaption{display:block;font-size:10px}.graph-heading p{font-size:9px}.observation .graphs{padding:4px}.chart-grid canvas{min-height:70px}}
@media(max-height:600px) and (min-width:651px){.observation.with-graphs{grid-template-rows:minmax(100px,1fr) 170px}.graphs #sample-count{display:none}}

/* Pressure rupture: readable status in both themes and compact touch layouts. */
.pressure-guide{font-size:12px;line-height:1.5;color:#596d7b;margin:0 0 12px}
.burst-status{margin:4px 8px;padding:9px 12px;border:1px solid #b27729;border-radius:9px;background:#fff2d6;color:#724206;font-size:13px;line-height:1.45;flex:none}
body[data-pressure-state=ruptured] .burst-status{background:#ffede6;border-color:#b65c37;color:#832d12}
body[data-pressure-state=warning] #pressure,body[data-pressure-state=ruptured] #pressure{color:#a74713}
body[data-pressure-state=ruptured] #reset{outline:2px solid #df8b3c;outline-offset:2px}
:root[data-theme=dark] .pressure-guide{color:#b4c9db}
:root[data-theme=dark] .burst-status{background:#382d1f;color:#ffe0a4;border-color:#ad8649}
:root[data-theme=dark] body[data-pressure-state=ruptured] .burst-status{background:#3c2725;color:#ffd1bd;border-color:#bd7962}
:root[data-theme=dark] body[data-pressure-state=warning] #pressure,:root[data-theme=dark] body[data-pressure-state=ruptured] #pressure{color:#ffc595}
@media(max-width:650px){.burst-status{font-size:12px;padding:6px 8px;margin:3px 6px}.pressure-guide{font-size:12px}}