/* Layout and visual explanations */
.sidebar{overflow-y:auto}.sidebar-bottom{padding-top:20px}.nav-group{margin:8px 0}.nav-group>summary{cursor:pointer;padding:8px 14px;color:var(--ink);font-size:11px;font-weight:650}.nav-group .nav-item{padding-left:25px;font-size:11px}.nav-group summary::marker{color:var(--muted)}
main{max-width:1600px;width:100%;margin:0 auto}.page-heading{margin-bottom:26px}h1{letter-spacing:-1px}.page-heading .subtitle{max-width:780px}.calc-card h3 a:after{content:'';position:absolute;inset:0}.calc-card{position:relative;min-width:0}.calc-card .star{position:relative;z-index:1}.calc-card h3{line-height:1.5}.calc-card:hover{border-color:#93b7b1}.category-tag{margin:0}.card-bottom{gap:12px}.card-bottom>span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pills{margin:20px 0;flex-wrap:wrap}.toolbar{margin-top:22px}.toolbar select{max-width:230px}.toolbar .search-wrap input{width:100%;padding:14px 16px}.toolbar .search-wrap{min-width:200px}.pagination{display:flex;gap:12px;justify-content:center;margin-top:25px}
.subtle-text{color:var(--muted);font-size:13px;line-height:1.8}.recent-section{padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:12px;margin-bottom:18px}.recent-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.recent-tool{display:flex;flex-direction:column;gap:8px;padding:16px;border:1px solid var(--line);border-radius:8px}.recent-tool:hover{background:var(--subtle)}.recent-tool span{font-size:10px;color:var(--muted)}.recent-tool strong{font-size:13px}.recent-tool span:last-child{margin-top:auto;color:var(--accent)}.activity-panel{padding:22px;border:1px solid var(--line);border-radius:12px;margin-bottom:24px;background:var(--subtle)}.activity-feed{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.activity-entry{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}.activity-entry strong{font-size:12px;font-weight:550;flex:1}.activity-entry span{font-size:10px;color:var(--muted)}.activity-panel .field-hint{margin-top:12px}.section-head{gap:12px}.section-head h2{font-size:14px}.detail-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.results-panel .result-row{padding:14px 0}.results-panel .panel-body>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.results-panel .result-row{border-bottom:0}.result-value{font-size:29px}.result-value span{display:inline-block}.calculator .panel-body{min-width:0}.calculator .panel-body>div{min-width:0}.calculator .field{margin-bottom:18px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 15px}.form-grid .field{min-width:0}.form-grid input,.form-grid select{width:100%}.field label{font-size:12px}.field-hint{font-size:11px}.form-error{font-size:12px}.notice{font-size:12px}.notice h2{font-size:13px;margin-bottom:10px}.sources{font-size:12px}
.explain-diagram{width:100%;height:auto;max-height:260px;padding:15px;border-radius:10px;background:var(--subtle);color:var(--accent);stroke-width:2}.explain-diagram .diagram-label{stroke:none;fill:var(--ink);font-size:14px}.wire,.component,.tank{fill:none;stroke:var(--accent);stroke-width:2}.source-symbol{fill:var(--panel);stroke:var(--accent)}.water-fill{fill:#79b8d145;stroke:#5d9eb2;stroke-width:1.5}.water-line{fill:none;stroke:#5d9eb2}.substrate-fill{fill:#bd9e6a80;stroke:none}.signal-wave{fill:none;stroke:#418f9d;stroke-width:3}.secondary-wire{fill:none;stroke:#d09453;stroke-width:2.5}.bar-bg{fill:var(--panel);stroke:var(--line)}.bottle{fill:#cba66724;stroke:#a67d45}.explanation-list{margin:24px 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.explanation-step{display:flex;gap:13px;align-items:flex-start;padding:17px;background:var(--subtle);border-radius:9px}.explanation-step p{margin:0;font-size:12px;line-height:1.9}.step-number{font:600 12px ui-monospace,monospace;color:var(--accent);border-bottom:2px solid var(--accent);padding:2px 0;min-width:16px}.equations{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.equation-card{border:1px solid var(--line);padding:18px;border-radius:9px;overflow:auto;min-width:0}.equation-card h3{font-size:12px;margin:0 0 15px;color:var(--muted)}math{font-size:20px;min-width:max-content;margin:12px 0}.substitution{color:var(--muted);border-top:1px solid var(--line);padding-top:5px}.substitution math{font-size:16px}.variable-legend{display:grid;grid-template-columns:max-content 1fr;gap:8px 20px;grid-column:1/-1;font-size:11px;padding:16px;background:var(--subtle);border-radius:8px}.variable-legend dt{font-family:ui-monospace,monospace;color:var(--accent)}.variable-legend dd{margin:0;color:var(--muted)}.curve-section{margin-top:24px}.curve-section:empty{display:none}.curve-section h3{font-size:14px}.plot-controls{display:grid;grid-template-columns:1.2fr 1.2fr 1fr 1fr;gap:12px;margin:16px 0}.plot-controls label{font-size:11px;color:var(--muted)}.plot-controls input,.plot-controls select{display:block;width:100%;margin-top:6px;min-width:0;font-size:11px}.curve-svg{width:100%;height:auto;background:var(--subtle);border-radius:8px;stroke:none}.curve-line{fill:none;stroke:#367f8b;stroke-width:2.5}.grid-line{stroke:var(--line);stroke-width:1}.axis-label{font-size:10px;fill:var(--muted)}.curve-svg .diagram-label{font-size:12px;fill:var(--ink);stroke:none}.bar-line{stroke:#367f8b;stroke-width:4;opacity:.7}.api-section summary{cursor:pointer}.api-section h3{font-size:12px}.api-section pre{font-size:12px;border:1px solid var(--line);max-height:360px;overflow:auto}.api-section .section-head{margin-top:20px}
.creator-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:24px;align-items:start}.editor-sections{display:flex;flex-direction:column;gap:20px;min-width:0}.preview-column{min-width:0;position:sticky;top:18px;max-height:calc(100vh - 36px);overflow-y:auto;scrollbar-width:thin}.creator-preview .detail-layout{grid-template-columns:1fr}.creator-preview .explanations,.creator-preview .explanation-list,.creator-preview .equations{grid-template-columns:1fr}.creator-preview .panel-heading{padding:16px}.creator-preview .panel-body{padding:18px}.creator-preview .results-panel .panel-body{display:block}.creator-preview .plot-controls{grid-template-columns:1fr 1fr}.creator-preview .section-space{margin-top:18px}.creator-preview .result-value{font-size:25px}.builder-row{border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:22px}.builder-row:last-child{border:0}.builder-row .section-head h3{font-size:13px}.compact-textarea{min-height:90px}.formula-input{min-height:76px;font-family:ui-monospace,monospace;font-size:13px;background:var(--subtle)}.formula-tokens{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.token-button{padding:5px 9px;border-radius:5px;color:var(--accent);background:var(--subtle);font:11px ui-monospace,monospace;border:1px solid var(--line)}.unit-editor{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;padding:12px;background:var(--subtle);margin:12px 0}.unit-editor input{width:100%;min-width:0}.unit-editor .line-link{grid-column:1/-1}.builder-row details>summary{font-size:12px;cursor:pointer;margin:12px 0}.creator-save{padding:22px;margin-top:24px;background:var(--panel);border:1px solid var(--line);border-radius:10px}.preview-error{padding:25px;background:var(--subtle);border-radius:10px}.preview-error h3{font-size:15px}.preview-error p{font-size:12px;line-height:1.8}.ai-start{margin-bottom:24px}.ai-start summary{cursor:pointer}.ai-start textarea{min-height:100px;margin-bottom:16px}.honeypot{position:absolute!important;left:-10000px!important;width:1px!important;height:1px!important;opacity:0!important}.review-list{display:flex;flex-direction:column;gap:20px}.review-list>.panel{overflow:visible}.review-list>.panel>.panel-body>details{margin-bottom:20px}.review-list .calculator{margin-top:20px}.review-list textarea{min-height:70px}.review-list .field{margin-top:20px}.review-list .panel-body>p{white-space:pre-wrap}.review-list .recent-tags{margin:0 0 10px}
@media(min-width:1550px){.creator-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}
@media(max-width:1180px){.recent-grid{grid-template-columns:1fr 1fr}.creator-layout{grid-template-columns:1fr}.preview-column{position:static;max-height:none}.creator-preview .detail-layout{grid-template-columns:1fr 1fr}.creator-preview .equations{grid-template-columns:1fr 1fr}}
@media(max-width:800px){.detail-layout,.creator-preview .detail-layout{grid-template-columns:1fr}.results-panel .panel-body{display:block}.explanation-list,.equations{grid-template-columns:1fr}.activity-feed{grid-template-columns:1fr}.plot-controls{grid-template-columns:1fr 1fr}.creator-preview .equations{grid-template-columns:1fr}.top-actions{margin-left:auto}.preview-column{order:2}.sidebar-bottom{margin-top:18px}.activity-panel,.recent-section{padding:18px}}
@media(max-width:480px){.recent-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr 1fr;gap:0 10px}.form-grid .field label{font-size:11px}.panel-heading{padding:16px}.panel-body{padding:17px}.result-value{font-size:28px}.explain-diagram{padding:4px}.toolbar select{max-width:48%;flex:1}.api-section pre{font-size:10px}.activity-panel .section-head{align-items:flex-start;flex-direction:column}.creator-save{padding:16px}.brand{padding-bottom:20px}}
@media print{.creator-save,.plot-controls,.api-section{display:none}.preview-column{position:static;max-height:none}.curve-svg,.explain-diagram{max-height:240px}.equations{display:block}.equation-card{break-inside:avoid;margin-bottom:10px}}