/* BeamSolve workspace: layout and visual language shared by both themes. */
:root {
  --bg:#eef1f1;--bg-card:#fff;--bg-input:#f5f7f7;
  --border:#dce3e3;--text:#1c3034;--text-sec:#52666a;--text-muted:#63777b;
  --accent:#087f73;--accent-hover:#06675d;--accent-lt:#169d90;
  --accent-bg:#e6f4f1;--border-focus:#087f73;--primary:#087f73;
  --cta:#087f73;--cta-hover:#06675d;--radius:6px;--radius-lg:10px;
}
[data-theme="dark"] {
  color-scheme:dark;
  --bg:#101a1e;--bg-card:#17252a;--bg-input:#1c2d33;
  --border:#2d4148;--text:#e6efef;--text-sec:#b2c3c6;--text-muted:#8da5ab;
  --accent:#52cabb;--accent-hover:#6edbce;--accent-lt:#6edbce;
  --accent-bg:#203e3e;--primary:#52cabb;--border-focus:#52cabb;
  --cta:#258c80;--cta-hover:#2da596;--diagram-bg:#17252a;
}
[data-theme="light"]{color-scheme:light}
button,input,select{font:inherit}
button:focus-visible,summary:focus-visible,[role="button"]:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;
}
[hidden]{display:none!important}
#app{height:100dvh;display:grid;grid-template-columns:158px minmax(0,1fr);grid-template-rows:58px 80px minmax(0,1fr) 58px auto 26px;grid-template-areas:"nav nav" "project project" "tools main" "export export" "notice notice" "status status"}
#navbar{grid-area:nav;height:auto;background:var(--bg-card);color:var(--text);border-color:var(--border);padding:0 24px;gap:20px}
.nav-brand{font-size:19px;color:var(--text);margin:0;letter-spacing:-.7px}
.nav-brand .nav-mark{width:24px;height:24px}
.nav-mark rect{fill:var(--accent)}
.nav-tab,.nav-tab.active{font-size:11px;font-weight:500;color:var(--text-muted);border:0;padding:0 20px;border-left:1px solid var(--border);height:20px}
.nav-tabs{align-items:center}
.nav-right{gap:12px;color:var(--text-muted)}
.theme-toggle{width:auto;height:33px;padding:0 10px;gap:7px;color:var(--text-sec);border-color:var(--border);font-size:11px}
.theme-toggle:hover{color:var(--text);border-color:var(--accent)}
.workspace-access{border:1px solid var(--border);background:var(--accent-bg);color:var(--accent);padding:7px 12px;border-radius:5px;cursor:pointer;font-size:11px;font-weight:600}
.version-label{font-size:10px}
#project-bar{grid-area:project;padding:12px 24px;gap:22px;min-width:0}
.proj-field{display:flex;flex-direction:column;align-items:stretch;gap:3px;min-width:0}
.proj-field label{font-size:9px;letter-spacing:1px}
.proj-field input{width:145px;background:transparent;border-color:transparent;padding:3px 0;border-radius:0;font-size:12px}
.proj-field input:hover{border-bottom-color:var(--border)}
.proj-field input:focus{border-bottom-color:var(--accent);box-shadow:none}
.proj-field.project-title{flex:1;max-width:440px}
.project-title input{width:100%;font-size:22px;font-weight:600;letter-spacing:-.7px}
.proj-sep{height:32px}
.save-state{font-size:10px;color:var(--text-muted);margin-left:auto;white-space:nowrap}
#toolbar{grid-area:tools;flex-direction:column;align-items:stretch;justify-content:flex-start;flex-wrap:nowrap;overflow:auto;padding:22px 12px;background:var(--bg-card);border-bottom:0;border-right:1px solid var(--border);gap:18px}
.tb-section{flex-direction:column;align-items:stretch;gap:10px}
.tb-lbl{font-size:9px;letter-spacing:1.2px;padding:0 9px}
.preset-seg{flex-direction:column;border:0;padding:0;background:none;gap:3px}
.preset-btn{text-align:left;white-space:normal;padding:8px 9px;font-size:11px;line-height:1.4}
.preset-btn.active,[data-theme="dark"] .preset-btn.active{background:var(--accent-bg);color:var(--accent);box-shadow:none}
.tool-grp{flex-direction:column;align-items:stretch;gap:4px}
.tool-btn{border-color:transparent;background:transparent;padding:9px;font-size:11px;gap:10px}
.tool-btn:hover{background:var(--bg-input);border-color:var(--border)}
.tool-btn.active{background:var(--accent-bg);color:var(--accent);border-color:var(--accent)}
.tool-btn.active .tool-icon{color:var(--accent)}
.tb-sep{height:1px;width:100%;margin:0;background:var(--border)}
.snap-ctrl{padding:8px 5px;justify-content:center}
.snap-select{max-width:65px}
.tb-spacer{display:none}
.tb-hint{font-size:10px;line-height:1.8;padding:0 8px;color:var(--text-muted);margin-top:auto}
#main{grid-area:main;min-width:0;min-height:0}
#canvas-area{min-width:0}
.view-tabs{padding:0 20px;height:50px;flex-shrink:0;align-items:stretch;background:var(--bg-card);gap:20px}
.view-tab{font-size:11px;padding:0 1px;white-space:nowrap}
#beam-strip{height:55px;padding:0 20px;background:var(--bg-card);border-color:var(--border);gap:4px}
.bs-item{padding:0 12px}
.bs-item:first-child{padding-left:0}
.bs-label{font-size:8px;color:var(--text-muted);letter-spacing:1px}
.bs-value{font-family:var(--mono);font-size:11px;color:var(--text)}
.bs-sep{background:var(--border)}
.bs-status-lbl{color:var(--text-sec)}
#solver-panel{padding:20px!important;gap:16px!important;overflow:auto;min-height:0}
.workspace-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}
.eyebrow{font-size:9px;letter-spacing:1.7px;font-weight:700;color:var(--text-muted)}
.workspace-heading h1{font-size:22px;font-weight:500;letter-spacing:-.7px;line-height:1.4;margin-top:3px}
.workspace-note{font-size:10px;color:var(--text-muted);max-width:125px;line-height:1.7;text-align:right}
.mobile-inputs{display:none}
.diagram-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:10px;color:var(--text-sec)}
.diagram-toolbar button,.mobile-inputs{border:1px solid var(--border);border-radius:5px;padding:5px 8px;background:var(--bg-card);color:var(--accent);font-size:10px;cursor:pointer}
.diagram-toolbar button[aria-pressed="true"]{background:var(--accent-bg);border-color:var(--accent)}
.canvas-card,.dg-card{box-shadow:0 2px 5px #071e2404}
.cc-hdr{padding:12px 16px;background:var(--bg-card)}
.cc-title{font-size:10px;text-transform:none;letter-spacing:0;font-weight:600}
.model-live{display:inline-block;background:var(--accent-bg);color:var(--accent);font-size:8px;letter-spacing:1px;padding:2px 5px;border-radius:3px;margin-left:8px}
#diagram-area{overflow:visible;flex:none;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
.dg-card{height:184px;border-radius:var(--radius-lg)}
.dg-hdr{height:38px;padding:10px 14px;background:var(--bg-card);border-bottom:1px solid var(--border)}
.dg-title{font-size:10px;font-weight:600;letter-spacing:.1px}
#sidebar{width:340px;padding:0;gap:0;overflow:hidden}
.inspector-heading{padding:21px 20px 15px}
.inspector-heading h2{font-size:18px;font-weight:500;letter-spacing:-.5px;margin-top:5px}
.inspector-tabs{display:flex;padding:0 20px;border-bottom:1px solid var(--border);gap:20px}
.inspector-tabs button{background:none;border:0;border-bottom:2px solid transparent;color:var(--text-muted);padding:10px 0;font-size:11px;cursor:pointer}
.inspector-tabs button[aria-selected="true"]{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
.inspector-panel{overflow-y:auto;padding:18px 18px 28px;min-height:0;scrollbar-width:thin}
.sb-top{padding:0 0 18px}
.sidebar-brand{display:none}
.sb-top::before{content:"Units";font-size:11px;color:var(--text-sec)}
.sb-units{width:158px}
.sc{box-shadow:none;border:0;border-radius:0;background:none;margin-bottom:18px}
.sc-hdr{padding:0 0 10px;background:none;border-bottom:1px solid var(--border)}
.sc-title{font-size:11px;font-weight:600;letter-spacing:0;display:flex;align-items:center;gap:8px}
.sc-body{padding:14px 0 0}
.sc-badge{background:var(--bg-input);color:var(--text-sec);border:1px solid var(--border)}
.fr{gap:8px;margin-bottom:9px}
.fr label{font-size:11px;color:var(--text-sec);width:57px}
.fr input,.fr select{min-height:33px;font-size:12px;border-radius:5px}
.fr .unit{font-size:10px;min-width:30px}
.tog-row{margin-bottom:14px}
.tog-lbl{display:none}
.tog-row .tog-sw{width:100%}
.tog-row .tog-opt{flex:1;text-align:center;font-size:10px;padding:7px 6px}
#custom-extra{border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin:16px 0;padding:12px 0}
#custom-extra summary{font-size:11px;cursor:pointer;color:var(--text);font-weight:600}
#custom-extra summary span{display:block;font-size:10px;color:var(--text-muted);font-weight:400;margin:5px 0 0 14px}
#custom-extra[open] summary{margin-bottom:14px}
.btn-primary{padding:11px}
[data-theme="dark"] .btn-primary,[data-theme="dark"] .ex-btn.primary{color:#102d2b}
.oi{padding:10px;border-color:var(--border);border-radius:6px}
.reset-model{background:transparent;border:1px dashed var(--border);font-size:10px;margin-top:18px;color:var(--text-muted)}
.reset-model:hover{border-color:var(--danger);color:var(--danger)}
.metrics-grid{gap:8px;margin-bottom:18px}
.mc{padding:14px 10px;background:var(--bg-input)}
.mc .mv{font-size:17px;letter-spacing:-.5px}
.mc .ml{font-size:9px}
#sidebar .uc-card{border-radius:6px}
#sidebar .uc-label{font-size:11px}
#sidebar .uc-row{gap:8px;margin-bottom:9px}
.access-intro{padding:6px 0 24px}
.access-intro h2{font-size:24px;font-weight:500;letter-spacing:-.7px;line-height:1.25;margin:12px 0}
.access-intro p,.access-note{font-size:12px;line-height:1.8;color:var(--text-sec)}
.lk-input{min-width:0}
.access-note{font-size:11px}
#export-bar{grid-area:export;padding:10px 24px;gap:10px}
.ex-btn{padding:9px 14px;font-size:11px}
.ex-btn.primary{background:var(--accent);border-color:var(--accent)}
.share-inp{display:none}
.app-disclaimer{grid-area:notice;font-size:9px;padding:4px 16px}
#statusbar{grid-area:status;background:var(--bg-card);color:var(--text-muted);border-top:1px solid var(--border);font-size:9px}
#seo-footer{display:none!important}
#results-panel,#handcalc-panel,#docs-panel{padding:24px;min-height:0}
.rd-title{letter-spacing:-.7px}
.rd-banner{background:var(--bg-card);border:1px solid var(--border);border-top:3px solid var(--accent);border-radius:8px;padding:24px}
.rd-banner h1{color:var(--text);font-size:22px;font-weight:600}
.rd-banner .rd-subtitle,.rd-stamp{color:var(--text-sec)}
.rd-banner .rd-subtitle strong,.rd-stamp strong{color:var(--text)}
.rd-body{padding:0 4px}
@media(min-width:1600px){#sidebar{width:370px}#solver-panel{padding:28px!important}#diagram-area{grid-template-columns:repeat(2,minmax(0,1fr))}.dg-card{height:220px}}
@media(max-width:1150px){#app{grid-template-columns:132px minmax(0,1fr)}#sidebar{width:300px}.workspace-note,.save-state,.version-label{display:none}#project-bar{gap:12px}.proj-field input{width:120px}.project-title input{width:100%;font-size:19px}.view-tabs{gap:12px;padding:0 12px}.view-tab{font-size:10px}.bs-item{padding:0 7px}.bs-status-item{display:none}}
@media(max-width:900px){
  html,body{height:auto;overflow:auto}#app{display:flex;height:auto;min-height:100dvh}
  #navbar{height:58px;padding:0 16px;gap:8px}.nav-tabs{display:none}.nav-brand{font-size:17px}
  #project-bar{flex-wrap:wrap;padding:15px 16px}.project-title{min-width:100%;max-width:none!important}.proj-sep{display:none}.proj-field{flex:1}.proj-field input{width:100%;min-width:80px}
  #toolbar{flex-direction:row;flex-wrap:wrap;overflow:visible;padding:12px 16px;gap:12px;border-bottom:1px solid var(--border)}
  .tb-section{flex-direction:row;flex-wrap:wrap;align-items:center;gap:6px}.preset-seg,.tool-grp{flex-direction:row;flex-wrap:wrap}.tb-sep,.tb-hint{display:none}.tool-btn{border-color:var(--border);padding:7px}.preset-btn{padding:7px}
  #main{overflow:visible;flex-direction:column}#canvas-area{overflow:visible;flex:none}#solver-panel{overflow:visible}#beam-strip{flex-wrap:wrap}.view-tabs{height:48px;gap:16px}
  .mobile-inputs{display:block}
  #sidebar{width:100%;border-left:0;border-top:1px solid var(--border);overflow:visible}.inspector-heading{padding:18px}.inspector-panel{overflow:visible}
  #export-bar{position:sticky;bottom:0;z-index:12;padding:10px 12px;flex-wrap:wrap;box-shadow:0 -4px 20px #0001}.ex-btn{padding:8px 10px}.share-grp{gap:5px}.app-disclaimer{padding:8px 16px}#statusbar{min-height:28px;flex-wrap:wrap}
}
@media(max-width:480px){.theme-toggle{padding:0 7px}.workspace-access{font-size:10px;padding:7px}.nav-right{gap:6px}#theme-label{display:none}.view-tabs{gap:11px}.view-tab{font-size:9px}.workspace-heading h1{font-size:21px}#solver-panel{padding:14px!important}#diagram-area{grid-template-columns:1fr}.ex-spacer{display:none}.share-grp{margin-left:auto}.ex-btn{font-size:10px;padding:7px}.ex-btn svg{width:12px}.bs-label{font-size:7px}.bs-value{font-size:10px}.bs-item{padding:0 6px}#statusbar>span:not(#status-text){display:none}}