/* Core lab layout remains usable without the external utility stylesheet. */
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer}h1,h2,h3,p{margin:0}h1{font-size:20px}h2{font-size:16px}h3{font-size:15px}[hidden],.hidden{display:none!important}
.lab-header{padding:14px 20px;position:relative;z-index:50}.lab-header>div{max-width:1480px;margin:auto;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.lab-header>div>div:first-child{display:flex;align-items:center;gap:12px}.lab-header>div>div:nth-child(2){position:relative;flex:1;max-width:440px;min-width:230px}#nl-search{width:100%;min-height:44px;padding:10px 46px 10px 14px;border:1px solid #4b637c;border-radius:12px;background:#0f2032;color:#eef5fa}.lab-header>div>div:nth-child(2)>button{position:absolute;right:10px;top:6px;background:none;border:0;color:#a8d9d5}.lab-header p{font-size:12px;color:#9db2c5}
main.chem-workspace{display:grid;grid-template-columns:minmax(0,1fr) 360px;align-items:start;gap:16px;max-width:1520px;width:100%;margin:auto;padding:20px}
.chem-table-panel{min-width:0;padding:16px;display:flex;flex-direction:column;gap:12px}.chem-table-panel>div:first-child{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px}.chem-table-panel>div:first-child>div{font-size:11px;color:#aabfd0;max-width:280px;line-height:1.5}
.chem-table-panel .pt-grid{grid-template-columns:repeat(18,minmax(0,1fr));gap:4px;overflow:visible;width:100%;padding:0}.chem-table-panel .element-cell{max-height:62px;min-height:36px}.chem-table-panel .element-symbol{font-size:clamp(12px,1.35vw,20px)}
.chem-tools{min-width:0;position:sticky;top:16px;overflow:hidden}.chem-tabs{display:flex;gap:4px;padding:8px;border-bottom:1px solid #3b5068;background:#15283b}.chem-tabs button{flex:1;min-height:44px;padding:8px 6px;border:1px solid transparent;border-radius:8px;background:transparent;color:#acbfd0;font-size:11px;font-weight:600}.chem-tabs button[aria-selected=true]{background:#24475a;border-color:#407789;color:#d8f8f1}.chem-tabs button:focus-visible{outline:2px solid #a0e5dc;outline-offset:-3px}
.chem-tab-panel{padding:16px;display:flex;flex-direction:column;gap:14px;border:0;border-radius:0;background:transparent;backdrop-filter:none}.chem-tab-panel>div:first-child{display:flex;justify-content:space-between;gap:10px;align-items:center}.chem-tab-panel button:not(.element-token){min-height:44px}#chem-reaction>div:first-child>button{border:1px solid #4b637c;background:#243c51;color:#e2edf5;border-radius:8px;padding:8px;font-size:11px}.chem-quick-add{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:13px}.chem-quick-add>span:first-child{flex:1}.chem-quick-add button:disabled{opacity:.5;cursor:default}#chem-lab-status{flex-basis:100%;font-size:11px;color:#a3ddd4;min-height:16px}#chem-reaction>div:last-child{display:flex;flex-direction:column;gap:12px}
#drop-zone{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:190px;padding:18px;border-radius:12px;background:#122739}#drop-zone>i{font-size:32px;margin-bottom:12px;color:#678397}#drop-zone>p{font-size:12px;text-align:center;color:#a5bfce;line-height:1.5}#lab-elements-container{position:relative;display:flex;flex-wrap:wrap;justify-content:center;gap:8px;padding-top:14px;max-height:180px;overflow:auto}.element-token{min-width:44px;min-height:44px;border:1px solid #ffffff30}.element-token:focus-visible{outline:2px solid white;outline-offset:2px}#analyze-btn{display:flex;justify-content:center;align-items:center;gap:8px;border:1px solid #358b99;border-radius:10px;background:#176173;color:white;padding:12px;font-weight:600}#analyze-btn:disabled{opacity:.5}
.chem-output{position:relative}.chem-output>div:first-of-type{display:flex;justify-content:space-between;font-size:12px;color:#b4c8d9}#viewer-container{height:280px;flex:none;display:flex;align-items:center;justify-content:center}#viewer-placeholder{font-size:12px;color:#9aafc2;padding:14px;text-align:center}#ai-response-panel{position:absolute;inset:0;z-index:30;padding:16px;background:#132539;border:1px solid #44647c;border-radius:10px;overflow:auto;font-size:13px;line-height:1.6}#ai-response-panel>div{margin-bottom:14px}#ai-response-panel>div:first-child{display:flex;justify-content:space-between}#ai-response-panel button{background:#294258;border:0;border-radius:8px;color:white;width:44px}#ai-response-panel span{display:block;color:#a3b9cc;font-size:11px}#ai-equation{display:block;color:#a7e2c5;white-space:pre-wrap;overflow-wrap:anywhere}#element-detail-content{display:flex;flex-direction:column;font-size:13px;line-height:1.5}.element-photo-frame{height:170px!important}
@media(max-width:1100px){main.chem-workspace{grid-template-columns:minmax(0,1fr) 310px;padding:12px;gap:12px}.chem-table-panel{padding:12px}.chem-table-panel .element-mass{display:none}.chem-table-panel .element-number{font-size:8px;left:2px}.chem-table-panel .element-cell{min-height:28px}}
@media(max-width:900px){main.chem-workspace{grid-template-columns:minmax(0,1fr)}.chem-tools{position:static}.chem-table-panel .pt-grid{grid-template-columns:repeat(18,minmax(44px,1fr));overflow-x:auto;padding:3px 3px 10px;overscroll-behavior-x:contain}.chem-table-panel .element-cell{min-height:44px;max-height:52px}.chem-table-panel .element-symbol{font-size:16px}.chem-table-panel .element-mass{display:block}.chem-tabs{position:sticky;top:0;z-index:1}.chem-tab-panel{padding:14px}.chem-table-panel>div:first-child>div{max-width:none}.lab-header{padding:12px}.lab-header>div>div:nth-child(2){max-width:none;flex-basis:100%}.pt-series-name{font-size:9px}.chem-tools{overflow:visible}}
#ai-response-panel{flex-direction:column;gap:12px}
@media(max-width:900px){.chem-table-panel .pt-grid{max-height:340px;overflow-y:auto}.chem-table-panel .pt-layout-note{font-size:11px}.chem-tabs button{font-size:12px}.chem-output #viewer-container{height:240px}}
@media(max-width:480px){#drop-zone{min-height:140px}.chem-tab-panel{gap:10px}.chem-quick-add{gap:6px}.chem-table-panel .pt-grid{max-height:290px}.chem-table-panel>div:first-child{align-items:start}.chem-table-panel>div:first-child>div{font-size:11px}}
/* Compact controls belong to the lab header, not a separate introductory banner. */
.lab-header{background:rgba(25,39,58,.96);border-bottom:1px solid #334d62;box-shadow:0 4px 18px #02081730}
.lab-header>div{row-gap:12px}
.lab-model-tools{flex-basis:100%;display:flex;align-items:center;flex-wrap:wrap;gap:10px 18px;padding-top:10px;border-top:1px solid #42536b70;color:#d5e5ef;background:transparent;font-size:12px}
.lab-primary-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;flex:1}
.lab-action,.lab-more-tools>summary{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:7px 13px;border:1px solid #4b637c;border-radius:9px;color:#d9e8f2;background:#20344b;font-size:12px;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s}
.lab-action-primary{background:#164a59;color:#c9f5ed;border-color:#338c95}
.lab-action:hover,.lab-more-tools>summary:hover{background:#2d465d;border-color:#7eabb9}
.lab-action-primary:hover{background:#1d6270;border-color:#73c7c3}
.lab-action:focus-visible,.lab-more-tools>summary:focus-visible,.lab-menu-action:focus-visible,.lab-language select:focus-visible{outline:2px solid #83d4d1;outline-offset:3px}
.lab-language{display:flex;align-items:center;gap:8px;color:#abbfd1;font-size:11px}
.lab-language select{padding:7px 9px;border:1px solid #4b637c;border-radius:8px;background:#182c41;color:#e5f0f8;font-size:12px;min-height:36px;max-width:140px}
.lab-more-tools{position:relative}
.lab-more-tools>summary{list-style:none;background:transparent;border-color:transparent;color:#acbfce;padding:7px 9px}
.lab-more-tools>summary::-webkit-details-marker{display:none}
.lab-more-tools>summary::after{content:'⌄';padding-left:7px;color:#80b9c7}
.lab-more-tools[open]>summary{color:#dcf1f4;background:#263e53}
.lab-tools-menu{position:absolute;top:calc(100% + 8px);left:0;width:240px;max-width:calc(100vw - 35px);padding:8px;border:1px solid #4a6a81;border-radius:12px;background:#1d3146;box-shadow:0 12px 35px #02091766;z-index:70}
.lab-menu-action{display:block;width:100%;padding:11px 10px;background:transparent;border:0;border-radius:7px;text-align:left;font-size:12px;color:#dfeaf2;cursor:pointer}
.lab-menu-action:hover{background:#304d63;color:#d7fbf1}
.lab-menu-note{margin:3px 10px 8px;padding-bottom:10px;border-bottom:1px solid #415d7370;font-size:11px;line-height:1.5;color:#9bb4c7}
.lab-connection-status{flex-basis:100%;font-size:12px;color:#a8d9d5;line-height:1.5;padding:2px 0}
.lab-connection-status:empty{display:none}
@media(max-width:600px){.lab-header{padding:12px}.lab-model-tools{gap:8px}.lab-primary-actions{flex-basis:100%;gap:6px}.lab-action{padding:7px 10px}.lab-language{margin-left:auto}.lab-tools-menu{left:auto;right:0}.lab-model-tools .lab-connection-status{font-size:11px}.lab-header #nl-search{font-size:12px}}

/* Complete table: quiet hover, visible selection, and optional details. */
.pt-grid{grid-template-columns:repeat(18,minmax(34px,1fr));column-gap:4px;row-gap:5px;align-items:start}
.pt-group{font-size:10px;line-height:18px;text-align:center;color:#a9bdcf}
.element-cell{border:0;color:#fff;padding:0;min-width:0;width:100%;font-family:inherit}
.element-cell:hover{transform:none;z-index:auto;box-shadow:inset 0 0 0 2px #ffffffb0}
.element-cell:focus-visible,.element-cell[aria-pressed="true"]{outline:2px solid #e8fcff;outline-offset:1px;box-shadow:0 0 0 3px #102a3b}
.element-cell .element-mass{font-size:8px;letter-spacing:-.15px}
.pt-series-marker{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:6px;font-size:10px;color:#fff;text-align:center}
.pt-series-name{align-self:center;color:#b3c8d8;font-size:10px;overflow-wrap:anywhere;text-align:right;padding-right:8px}
.pt-series-spacer{height:8px}
.pt-layout-note{margin:0;color:#aabfd0;font-size:12px;line-height:1.5}
#element-detail-content{justify-content:flex-start;text-align:left;align-items:stretch;min-height:0;gap:12px}
.element-detail-heading{display:flex;align-items:center;gap:12px}
.element-detail-symbol{display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:10px;font-size:24px;font-weight:700}
.element-extra{margin-top:2px;font-size:12px;color:#c2d2df;border-top:1px solid #405369;padding-top:10px}
.element-extra>summary{cursor:pointer;color:#c5e2ef;line-height:1.6}
.element-properties{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:14px 0}
.element-properties dt{color:#a1b6c8}
.element-properties dd{margin:0;text-align:right;color:#ecf4fa}
.element-data-note{color:#a1b6c8;font-size:11px;line-height:1.5}
.element-source{display:inline-block;margin-top:10px;color:#9dd9e5;text-decoration:underline}

/* A single, non-interactive facts balloon never blocks the tile or a drag. */
.element-hover{position:fixed;z-index:100;pointer-events:none;width:228px;max-width:calc(100vw - 16px);padding:13px 15px;border:1px solid #61949e;border-radius:12px;background:#f0f7fa;color:#1e3e50;box-shadow:0 8px 24px #02081750;font-size:12px;line-height:1.4}
.element-hover[hidden]{display:none}
.element-hover strong{display:block;font-size:14px;color:#173d50}
.element-hover-family{display:block;margin:3px 0 10px;color:#476578;font-size:11px}
.element-hover dl{display:grid;grid-template-columns:1fr auto;gap:5px;margin:0}
.element-hover dd{margin:0;font-weight:600;text-align:right}
.element-hover-help{display:block;border-top:1px solid #cedfe6;padding-top:8px;margin-top:9px;color:#486d7d;font-size:11px}

/* Real sample photos remain separate from the table's family colors. */
.element-hover{width:270px;padding:12px 14px}
.element-hover-photo{float:right;width:62px;margin:0 0 8px 10px;text-align:center}
.element-hover-photo img{display:block;width:56px;height:56px;object-fit:contain;background:#162534;border-radius:6px}
.element-hover-photo span{display:block;font-size:9px;line-height:1.2;margin-top:4px;color:#506d7c}
.element-hover dl{clear:both;padding-top:4px}
.element-hover-use{margin:8px 0 0;padding-top:8px;border-top:1px solid #cedfe6;color:#2b5367;font-size:11px;line-height:1.4}
.element-hover-help{margin-top:7px;padding-top:0;border:0}
.element-real-life{display:flex;flex-direction:column;gap:14px}
.element-photo{margin:0}
.element-photo-frame{height:220px;display:flex;align-items:center;justify-content:center;background:#0f1c2a;border:1px solid #3d5367;border-radius:10px;overflow:hidden}
.element-photo-frame img{display:block;width:100%;height:100%;object-fit:contain}
.element-photo-frame img[hidden]{display:none}
.element-photo-failed{font-size:12px;color:#bfd0db;text-align:center;padding:20px}
.element-photo-failed[hidden]{display:none}
.element-photo figcaption{padding:9px 0 0;line-height:1.5}
.element-photo-kind{display:inline-block;font-size:10px;line-height:1.3;border:1px solid #48707c;border-radius:5px;background:#193b45;color:#b9e6e2;padding:3px 6px}
.element-photo figcaption p{font-size:12px;color:#d7e5ee;margin:6px 0}
.element-photo-credit{font-size:10px;color:#a8bdce}
.element-photo-credit a{color:#a9d8e6;text-decoration:underline;text-underline-offset:2px}
.element-photo-missing{padding:12px;border:1px dashed #53687d;border-radius:9px;color:#a8c0d1;font-size:12px}
.element-uses h4{margin:0 0 8px;font-size:13px;font-weight:600;color:#dbeaf2}
.element-use-cards{display:grid;grid-template-columns:1fr;gap:8px}
.element-use-cards>div{padding:10px 12px;border:1px solid #3c5d70;border-radius:9px;background:#193345}
.element-use-cards>div+div{background:#233248;border-color:#4d5e78}
.element-use-cards strong{display:block;font-size:11px;color:#9adcd4}
.element-use-cards>div+div strong{color:#b8caed}
.element-use-cards p{font-size:12px;line-height:1.5;color:#e0eaf0;margin:4px 0 0}
.element-uses .element-source{font-size:10px;margin-top:8px}
@media(min-width:1280px){.element-photo-frame{height:240px}}

/* Desktop: compare the table, flask, model, and facts without changing tabs. */
@media(min-width:1101px){
 main.chem-workspace{grid-template-columns:minmax(0,1.4fr) minmax(440px,1fr);max-width:1800px;gap:18px;padding:20px}
 .chem-table-panel{position:sticky;top:18px;align-self:start}
 .chem-table-panel .element-cell{min-height:32px;max-height:62px}
 .chem-table-panel .element-number{font-size:8px;left:3px}
 .chem-table-panel .element-mass{font-size:7px}
 .chem-tools{position:static;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:stretch;overflow:visible}
 .chem-tabs{grid-column:1/-1}
 .chem-tab-panel{min-width:0;padding:14px;gap:12px;height:auto}
 #chem-reaction{grid-column:1;grid-row:1;border-right:1px solid #3b5068}
 #chem-reaction h2{font-size:15px}#chem-reaction>div:first-child{align-items:start;flex-wrap:wrap}
 #chem-reaction #drop-zone{min-height:185px;padding:14px}
 #chem-reaction #analyze-btn{font-size:12px;padding:11px 8px}
 #chem-model{grid-column:2;grid-row:1}
 #chem-model #viewer-container{height:280px;min-width:0;width:100%}
 #detail-card{grid-column:1/-1;grid-row:2;border-top:1px solid #3b5068}
 #element-detail-content{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:12px;height:auto}
 #element-detail-content>.element-real-life,#element-detail-content>.element-extra{grid-column:1/-1}
 #element-detail-content>.lab-action{width:auto;font-size:12px}
 .element-real-life{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:14px;align-items:start}
 .element-photo-frame{height:150px!important}
 .element-photo figcaption p{font-size:11px}.element-use-cards p{font-size:11px}
 #element-detail-content>p{grid-column:1/-1}
}

/* Keep the lab header from covering the table during selection and dragging. */
header.lab-header{position:relative}

/* The same deliberate add action works with a mouse, touch, or keyboard. */
.element-cell{touch-action:manipulation}
#chem-add-dialog{max-width:420px;width:calc(100% - 32px);margin:auto;padding:0;border:1px solid #6b9aa8;border-radius:18px;background:#172b3e;color:#edf6fa;box-shadow:0 20px 70px #02081788}
#chem-add-dialog::backdrop{background:#04101b99;backdrop-filter:blur(3px)}
.chem-add-content{padding:24px;display:flex;flex-direction:column;gap:14px}.chem-add-kicker{font-size:12px;letter-spacing:.08em;color:#94d8d0}.chem-add-content h2{font-size:22px}.chem-add-content>p{font-size:14px;line-height:1.5;color:#bfd1de}.chem-add-content .chem-add-element{font-size:20px;font-weight:700;color:#e7faf7}.chem-add-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}.chem-add-actions button{min-height:44px;flex:1;font-size:14px}

#ai-products,#ai-conditions{margin:4px 0 0;color:#e2f3f7}#ai-products-section{padding:10px 12px;border-radius:9px;background:#17433f;border:1px solid #2c7564}#ai-conditions-section{padding:10px 12px;border-radius:9px;background:#263b52;border:1px solid #41627c}

.chem-query-mode{display:flex;align-items:center;gap:10px;font-size:12px;color:#bad4df;margin-bottom:7px}.chem-query-mode select{min-height:36px;border:1px solid #496578;border-radius:8px;padding:5px 10px;background:#183549;color:#eff9ff}.chem-search-line{position:relative}.chem-search-line>button{position:absolute;right:10px;top:6px;background:none;border:0;color:#a8d9d5}#material-result{border:1px solid #448b8d;background:#153740;border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:10px;font-size:13px;line-height:1.6}.material-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}.material-heading button{background:#2b4e5b;border:0;border-radius:8px;color:#fff;min-width:44px}.material-heading h3{font-size:18px;color:#c4f3dc}#material-result h4{margin:4px 0 0;font-size:13px;color:#bde9dc}.material-elements{display:flex;flex-wrap:wrap;gap:8px}.material-element{min-height:44px;padding:8px 10px;border:1px solid #70b9b0;border-radius:8px;background:#275756;color:#edfff9;font-weight:600}.material-element-note{flex-basis:100%;font-size:12px;color:#bcd7dc}.element-cell.material-main{outline:3px solid #b4ffe0;outline-offset:1px;box-shadow:0 0 15px #6ce8bb80;z-index:2}.element-cell.material-variable{outline:2px dashed #ffdb8e;outline-offset:1px}.material-note,#material-scope{font-size:12px;color:#bad2dc}#material-sources{display:flex;flex-direction:column;gap:5px}#material-sources a{color:#a9e5fa;text-decoration:underline}

#chem-model-source{font-size:11px;color:#a9e5fa;text-decoration:underline;margin-top:8px}#ai-response-panel #chem-view-product{width:auto;min-height:44px;padding:8px 12px;background:#1d6977}