:root{
  --wood-900:#3a2515; --wood-700:#6b4423; --wood-500:#9c6b3f; --wood-300:#c89b6a;
  --accent:#c2410c; --accent-700:#9a3412;
  --bg:#f7f4ef; --panel:#ffffff; --ink:#241b13; --muted:#7a6e62;
  --line:#e6ded3; --ok:#15803d; --ok-bg:#ecfdf3; --no:#b91c1c; --no-bg:#fef2f2;
  --warn:#92600a; --warn-bg:#fffbeb;
  --shadow:0 1px 3px rgba(58,37,21,.08),0 8px 24px rgba(58,37,21,.06);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}

/* top bar */
.topbar{display:flex;align-items:center;gap:2rem;padding:0 1.5rem;height:60px;background:var(--wood-900);
  position:sticky;top:0;z-index:20;box-shadow:var(--shadow)}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;
  background:linear-gradient(135deg,var(--wood-300),var(--accent));font-weight:800;color:#fff}
.brand-text{font-weight:700;letter-spacing:.2px}
.brand-text small{display:block;font-weight:400;font-size:.7rem;color:var(--wood-300);letter-spacing:.5px}
.topnav{display:flex;gap:.25rem;flex-wrap:wrap}
.topnav a{color:#e9dccb;padding:.45rem .8rem;border-radius:7px;font-size:.92rem;font-weight:500}
.topnav a:hover{background:rgba(255,255,255,.08);color:#fff}
.topnav a.active{background:var(--accent);color:#fff}
.topnav .nav-top{color:#e9dccb;padding:.45rem .8rem;border-radius:7px;font-size:.92rem;font-weight:600;display:inline-block}
.topnav .nav-top:hover{background:rgba(255,255,255,.08);color:#fff}
.topnav .nav-top.active{background:var(--accent);color:#fff}
.nav-group{position:relative}
.nav-drop{position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:10px;
  box-shadow:var(--shadow);padding:.4rem;min-width:200px;display:none;flex-direction:column;gap:.1rem;z-index:50}
.nav-group:hover .nav-drop{display:flex}
.nav-drop a{color:var(--ink);padding:.45rem .7rem;border-radius:6px;font-size:.9rem;font-weight:500}
.nav-drop a:hover{background:#f3ece2;color:var(--wood-900)}
.nav-drop a.active{background:var(--accent);color:#fff}

/* two-section landing */
.section-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.4rem;margin:2rem 0}
.section-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:1.6rem 1.7rem;
  display:flex;flex-direction:column;transition:transform .12s,box-shadow .12s;box-shadow:var(--shadow);position:relative}
.beta-badge{position:absolute;top:12px;right:12px;background:var(--accent);color:#fff;font-size:.62rem;
  font-weight:800;letter-spacing:.09em;text-transform:uppercase;padding:.2rem .5rem;border-radius:999px;
  box-shadow:0 2px 6px rgba(58,37,21,.22)}
.section-card:hover{transform:translateY(-3px);box-shadow:0 12px 34px rgba(58,37,21,.14)}
.section-card.feature{border-color:var(--accent);background:linear-gradient(180deg,#fff,#fff7f1)}
.section-card h2{margin:.9rem 0 .4rem;color:var(--wood-900)}
.section-card>p{color:var(--muted);margin:0 0 1rem}
.section-list{list-style:none;padding:0;margin:0 0 1.2rem;flex:1}
.section-list li{padding:.3rem 0 .3rem 1.4rem;position:relative;font-size:.92rem;color:var(--ink)}
.section-list li:before{content:"";position:absolute;left:.2rem;top:.7rem;width:7px;height:7px;border-radius:2px;background:var(--accent)}
.section-card .go{color:var(--accent);font-weight:700}
.section-icon{width:54px;height:54px;border-radius:12px;display:grid;place-items:center}
.icon-calc{background:linear-gradient(135deg,#6b4423,#c2410c)}
.icon-project{background:linear-gradient(135deg,#9a3412,#c89b6a)}

.container{max-width:1080px;margin:0 auto;padding:2rem 1.5rem 4rem}

/* hero / landing */
.hero{text-align:center;padding:2.5rem 0 1.5rem}
.hero h1{font-size:2.6rem;margin:0 0 .5rem;color:var(--wood-900)}
.hero p{font-size:1.15rem;color:var(--muted);max-width:640px;margin:0 auto}
.edition-pill{display:inline-block;margin-top:1.2rem;padding:.4rem 1rem;border:1px solid var(--line);
  border-radius:999px;background:var(--panel);font-size:.9rem;color:var(--wood-700)}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.2rem;margin-top:2rem}
.module-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1.4rem;
  box-shadow:var(--shadow);transition:transform .12s,box-shadow .12s;display:flex;flex-direction:column}
.module-card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(58,37,21,.12)}
.module-card h3{margin:.8rem 0 .3rem;color:var(--wood-900)}
.module-card p{color:var(--muted);font-size:.92rem;margin:0 0 1rem;flex:1}
.module-card .go{color:var(--accent);font-weight:600;font-size:.9rem}
.module-icon{width:46px;height:46px;border-radius:10px;background:var(--wood-700);
  -webkit-mask-size:contain;mask-size:contain}
.icon-beam{background:linear-gradient(135deg,#6b4423,#9c6b3f)}
.icon-column{background:linear-gradient(135deg,#7c5e3b,#b58a55)}
.icon-diaphragm{background:linear-gradient(135deg,#8a5a2b,#c2410c)}
.icon-shearwall{background:linear-gradient(135deg,#9a3412,#c89b6a)}
.icon-connection{background:linear-gradient(135deg,#52341c,#9c6b3f)}

/* module header */
.module-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:1.2rem}
.module-head h1{margin:0;color:var(--wood-900);font-size:1.9rem}
.sub{color:var(--muted);margin:.25rem 0 0}

/* form */
.design-form{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:1.4rem;box-shadow:var(--shadow)}
.toolbar{display:flex;flex-wrap:wrap;gap:1.5rem;align-items:center;padding-bottom:1.1rem;
  margin-bottom:1.1rem;border-bottom:1px solid var(--line)}
.toolbar-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);
  margin-right:.5rem;font-weight:600}
.edition-switch,.method-switch{display:flex;align-items:center;gap:.35rem;background:var(--bg);
  padding:.3rem;border-radius:10px;border:1px solid var(--line)}
.seg{position:relative;padding:.4rem .85rem;border-radius:7px;cursor:pointer;font-size:.88rem;
  font-weight:500;color:var(--muted);transition:all .12s}
.seg input{position:absolute;opacity:0;inset:0;cursor:pointer}
.seg.on{background:var(--wood-900);color:#fff}
.method-seg.on{background:var(--accent);color:#fff}

.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem}
.field{display:flex;flex-direction:column;gap:.3rem}
.field-wide{grid-column:span 2}
.field label{font-size:.85rem;font-weight:600;color:var(--wood-900)}
.field .unit{color:var(--muted);font-weight:400}
.field input,.field select{padding:.55rem .65rem;border:1px solid var(--line);border-radius:8px;
  font-size:.95rem;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(194,65,12,.12)}
.field .help{color:var(--muted);font-size:.75rem}
.checkbox{flex-direction:row;align-items:center;gap:.4rem;font-weight:500}
.checkbox input{width:auto}

.actions{display:flex;align-items:center;gap:1rem;margin-top:1.3rem}
.btn-primary{background:var(--accent);color:#fff;border:none;padding:.7rem 1.6rem;border-radius:9px;
  font-size:1rem;font-weight:600;cursor:pointer;box-shadow:0 2px 8px rgba(194,65,12,.25)}
.btn-primary:hover{background:var(--accent-700)}
.btn-ghost{background:transparent;border:1px solid var(--line);padding:.45rem 1rem;border-radius:8px;
  cursor:pointer;font-weight:500;color:var(--wood-700)}
.edition-note{color:var(--muted);font-size:.85rem}

/* alerts */
.alert{border-radius:10px;padding:.9rem 1.1rem;margin:1.2rem 0}
.alert.error{background:var(--no-bg);border:1px solid #fca5a5;color:var(--no)}
.alert.warn{background:var(--warn-bg);border:1px solid #fde68a;color:var(--warn)}
.alert ul{margin:.4rem 0 0;padding-left:1.2rem}

/* report */
.report{margin-top:1.8rem}
.verdict{display:flex;align-items:center;gap:1rem;border-radius:14px;padding:1.1rem 1.4rem;
  box-shadow:var(--shadow);margin-bottom:1.4rem}
.verdict.pass{background:var(--ok-bg);border:1px solid #86efac}
.verdict.fail{background:var(--no-bg);border:1px solid #fca5a5}
.verdict-icon{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;
  font-size:1.4rem;font-weight:800;color:#fff}
.verdict.pass .verdict-icon{background:var(--ok)}
.verdict.fail .verdict-icon{background:var(--no)}
.verdict-text{display:flex;flex-direction:column}
.verdict-text strong{font-size:1.1rem;letter-spacing:.5px}
.verdict.pass strong{color:var(--ok)} .verdict.fail strong{color:var(--no)}
.verdict-text span{color:var(--muted);font-size:.9rem}
.verdict-edition{margin-left:auto;font-size:.8rem;color:var(--muted);
  border:1px solid var(--line);padding:.3rem .7rem;border-radius:999px;background:#fff}

.summary-chips{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:1.4rem}
.chip{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);
  border-radius:10px;padding:.55rem .9rem;min-width:120px}
.chip-k{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.4px}
.chip-v{font-size:1.05rem;font-weight:700;color:var(--wood-900)}

h2{color:var(--wood-900);font-size:1.3rem;margin:1.8rem 0 .8rem}

table.checks{width:100%;border-collapse:collapse;background:var(--panel);border-radius:12px;
  overflow:hidden;box-shadow:var(--shadow)}
table.checks th{background:var(--wood-900);color:#fff;text-align:left;padding:.65rem .8rem;
  font-size:.8rem;text-transform:uppercase;letter-spacing:.4px}
table.checks td{padding:.65rem .8rem;border-top:1px solid var(--line);font-size:.92rem}
table.checks tr.no td{background:var(--no-bg)}
.ratio-bar{display:inline-block;width:90px;height:8px;background:var(--line);border-radius:5px;
  overflow:hidden;vertical-align:middle;margin-right:.5rem}
.ratio-bar span{display:block;height:100%;background:var(--ok)}
.ratio-bar span.over{background:var(--no)}
td.ref{color:var(--muted);font-size:.8rem}

.calc-toolbar{margin-bottom:1rem}
.calc-section{background:var(--panel);border:1px solid var(--line);border-radius:12px;
  margin-bottom:1.1rem;overflow:hidden;box-shadow:var(--shadow)}
.calc-section h3{margin:0;padding:.8rem 1.1rem;background:#f3ece2;
  color:var(--wood-900);font-size:1.02rem;border-bottom:1px solid var(--line)}
table.steps{width:100%;border-collapse:collapse}
table.steps td{padding:.7rem 1.1rem;border-top:1px solid var(--line);vertical-align:top}
.st-label{width:32%;font-weight:600;color:var(--wood-900);font-size:.92rem}
.st-note{display:block;font-weight:400;color:var(--muted);font-size:.78rem;margin-top:.2rem}
.st-math{font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:.88rem}
.st-math .eq{color:var(--ink)}
.st-math .sub{color:var(--muted);margin-top:.15rem}
.st-math .res{color:var(--accent-700);font-weight:700;margin-top:.25rem}
.st-ref{width:22%;color:var(--muted);font-size:.78rem;text-align:right}

.footer{border-top:1px solid var(--line);padding:1.5rem;text-align:center;color:var(--muted);
  font-size:.82rem;background:var(--panel)}
.footer-disclaimer{max-width:680px;margin:.6rem auto 0;font-size:.68rem;line-height:1.4;opacity:.75}

/* diagram panel */
.diagram-panel{background:linear-gradient(180deg,#fffdf9,#fbf6ee);border:1px solid var(--line);
  border-radius:12px;padding:.8rem 1rem 1rem;margin-bottom:1.3rem;box-shadow:inset 0 1px 0 #fff}
.diagram-caption{font-size:.78rem;text-transform:uppercase;letter-spacing:.5px;color:var(--wood-700);
  font-weight:700;margin-bottom:.4rem}
.diagram-caption small{text-transform:none;letter-spacing:0;color:var(--muted);font-weight:400}
.diagram-stage{display:flex;justify-content:center}
.diagram-hint{margin-top:-.25rem}
input.locked-by-section{background:#f3ede4;color:var(--wood-700);cursor:not-allowed}
.dgm{width:100%;max-width:680px;height:auto;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace}
.dgm-err{color:var(--muted);font-size:.85rem;padding:1rem}

/* svg element classes */
.dgm .ml{stroke:#3a2515;stroke-width:1.4;fill:none}
.dgm .member{fill:url(#wood);stroke:var(--wood-700);stroke-width:1.6}
.dgm .member2{fill:#d9b483;stroke:var(--wood-700);stroke-width:1.4}
.dgm .section{fill:url(#wood);stroke:var(--wood-700);stroke-width:1.6}
.dgm .support{fill:var(--wood-700);stroke:var(--wood-900);stroke-width:1}
.dgm .ground{stroke:#3a2515;stroke-width:2}
.dgm .hatchfill{fill:url(#hatch);stroke:var(--wood-700);stroke-width:1}
.dgm .panel{fill:#f3e9da;stroke:var(--wood-700);stroke-width:1.6}
.dgm .sheath{fill:url(#wood);stroke:var(--wood-700);stroke-width:1.6}
.dgm .opening{fill:#fff;stroke:var(--wood-700);stroke-width:1.4;stroke-dasharray:4 3}
.dgm .holddown{fill:#52341c}
.dgm .anchor{fill:#3a2515}
.dgm .hanger{fill:none;stroke:#5b6470;stroke-width:5}
.dgm .hangerf{fill:#aab3bf;stroke:#5b6470;stroke-width:1.4;opacity:.7}
.dgm .wood{fill:url(#wood);stroke:var(--wood-700);stroke-width:1.4}
.dgm .fastener{fill:#6b7280;stroke:#374151;stroke-width:1}
.dgm .metalhead{fill:#9aa3af;stroke:#374151;stroke-width:1.2}
.dgm .thread{stroke:#374151;stroke-width:1.1}
.dgm .slot{stroke:#374151;stroke-width:1.4}
.dgm .steel{fill:#aab3bf;stroke:#5b6470;stroke-width:1.4}
.dgm .steelwide{fill:none;stroke:#8b95a3;stroke-width:7;stroke-linejoin:round;stroke-linecap:round}
.dgm .naildot{fill:#374151;stroke:#1f2937;stroke-width:.6}
.dgm .shear{stroke:var(--accent);stroke-width:1.6;stroke-dasharray:6 3}
.dgm .chord{stroke:var(--wood-900);stroke-width:3}
.dgm .deflect{fill:none;stroke:var(--accent);stroke-width:1.4;stroke-dasharray:5 4;opacity:.8}
.dgm .load{stroke:var(--accent);stroke-width:1.6;fill:none}
.dgm .loadB{stroke:var(--accent);stroke-width:2.4;fill:none}
.dgm .loadtop{stroke:var(--accent);stroke-width:2}
.dgm .moment{fill:none;stroke:var(--accent);stroke-width:2}
.dgm .dimln{stroke:#7a6e62;stroke-width:1}
.dgm text{fill:var(--ink)}
.dgm .lbl{font-size:12px;fill:var(--ink)}
.dgm .lblb{font-size:12.5px;font-weight:700;fill:var(--wood-900)}
.dgm .lblw{font-size:12px;font-weight:700;fill:#fff}
.dgm .notew{font-size:10.5px;fill:#fff;opacity:.9}
.dgm .cap{font-size:11px;fill:var(--muted);font-style:italic}
.dgm .dim{font-size:11px;fill:#6b5d4f;font-weight:600}
.dgm .note{font-size:10.5px;fill:var(--muted)}
.dgm .noteV{font-size:10px;fill:var(--muted)}
.dgm .noteO{font-size:10px;fill:var(--wood-900);font-weight:600}

/* ===================== building design ===================== */
.nav-building{font-weight:700}
.building-app{margin-top:.4rem}

/* step nav */
.step-nav{display:flex;gap:.5rem;list-style:none;padding:0;margin:0 0 1.2rem;flex-wrap:wrap}
.step-nav .step{display:flex;align-items:center;gap:.5rem;padding:.5rem .9rem;border-radius:999px;
  border:1px solid var(--line);background:var(--panel);cursor:pointer;color:var(--muted);
  font-weight:600;font-size:.9rem}
.step-nav .step span{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;
  background:var(--line);color:var(--wood-900);font-size:.78rem}
.step-nav .step.on{border-color:var(--accent);color:var(--accent-700);background:#fff}
.step-nav .step.on span{background:var(--accent);color:#fff}

/* toolbar */
.bld-toolbar{display:flex;align-items:center;gap:1.4rem;flex-wrap:wrap;background:var(--panel);
  border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;margin-bottom:1.3rem;box-shadow:var(--shadow)}
.bld-name{display:flex;flex-direction:column;gap:.25rem}
.bld-name input{border:1px solid var(--line);border-radius:8px;padding:.45rem .6rem;font-size:.95rem;min-width:220px}
.toolbar-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);font-weight:700}
.edition-switch{display:flex;align-items:center;gap:.5rem}
.edition-switch>div{display:flex;gap:.3rem}
.bld-tools{margin-left:auto;display:flex;gap:.5rem}

/* buttons */
.btn-secondary{background:var(--wood-700);color:#fff;border:none;padding:.5rem 1rem;border-radius:8px;
  font-weight:600;cursor:pointer;font-size:.9rem}
.btn-secondary:hover{background:var(--wood-900)}
.btn-icon{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:1rem;
  line-height:1;padding:.2rem .4rem;border-radius:6px}
.btn-icon:hover{background:var(--no-bg);color:var(--no)}
.btn-mini{display:inline-block;background:var(--accent);color:#fff;border-radius:7px;padding:.3rem .6rem;
  font-size:.8rem;font-weight:600;text-decoration:none}
.btn-mini:hover{background:var(--accent-700)}

/* panels */
.step-panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1.2rem 1.3rem;
  box-shadow:var(--shadow)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.6rem}
.panel-head.sm h3{font-size:1rem;margin:0}
.panel-head h2{margin:0}
.hint{color:var(--muted);font-size:.88rem;margin:.3rem 0 1rem}
.step-actions{display:flex;justify-content:space-between;gap:1rem;margin-top:1.3rem}
.step-actions:only-child,.step-actions>:only-child{margin-left:auto}

/* editable grids */
.table-wrap{overflow-x:auto}
.grid-table{width:100%;border-collapse:collapse;font-size:.9rem}
.grid-table th{text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.4px;
  color:var(--muted);padding:.35rem .4rem;border-bottom:1px solid var(--line)}
.grid-table td{padding:.25rem .3rem;border-bottom:1px solid var(--line)}
.grid-table input,.grid-table select{width:100%;min-width:62px;border:1px solid var(--line);
  border-radius:6px;padding:.35rem .4rem;font-size:.88rem;background:#fff}
.grid-table input.w-id{min-width:54px;font-weight:600}
.grid-table .row-actions{width:34px;text-align:center}

/* layout step */
.layout-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,1fr);gap:1.4rem;align-items:start}
.floor-tabs{display:flex;gap:.4rem;flex-wrap:wrap}
.floor-tab{border:1px solid var(--line);background:#fff;border-radius:8px;padding:.4rem .7rem;cursor:pointer;
  font-weight:600;color:var(--wood-700);font-size:.88rem}
.floor-tab small{color:var(--muted);font-weight:400}
.floor-tab.on{border-color:var(--accent);background:#fff;color:var(--accent-700);box-shadow:0 0 0 2px rgba(194,65,12,.12)}
.plan-wrap{background:linear-gradient(180deg,#fffdf9,#fbf6ee);border:1px solid var(--line);border-radius:12px;
  padding:.8rem 1rem 1rem}
.plan-stage{display:flex;justify-content:center}
.plan-svg{width:100%;max-width:580px;height:auto;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace}
.plan-legend{display:flex;gap:1rem;flex-wrap:wrap;margin-top:.5rem;font-size:.78rem;color:var(--muted)}
.plan-legend .lg{display:inline-block;width:16px;height:8px;vertical-align:middle;margin-right:.3rem;border-radius:2px}
.lg-wallx{background:var(--accent)} .lg-wally{background:#0f766e}
.lg-com{background:var(--wood-900);border-radius:50%;width:10px;height:10px}
.lg-cr{background:none;border:2px solid #0369a1;width:10px;height:10px}
.wall-side .assembly{margin-top:.8rem;border:1px solid var(--line);border-radius:10px;padding:.4rem .7rem}
.wall-side .assembly summary{cursor:pointer;font-weight:600;color:var(--wood-700);font-size:.88rem}
.assembly-grid{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-top:.7rem}
.asm-field{display:flex;flex-direction:column;gap:.2rem;font-size:.78rem;color:var(--muted)}
.asm-field select{border:1px solid var(--line);border-radius:6px;padding:.35rem .4rem;font-size:.85rem;color:var(--ink)}

/* plan svg */
.plan-slab{fill:#f3e9da;stroke:var(--wood-700);stroke-width:1.6}
.plan-wallx{stroke:var(--accent);stroke-width:5;stroke-linecap:round}
.plan-wally{stroke:#0f766e;stroke-width:5;stroke-linecap:round}
.plan-wlbl{font-size:11px;font-weight:700;fill:var(--wood-900);text-anchor:middle}
.plan-dim{stroke:#7a6e62;stroke-width:1}
.plan-dimlbl{font-size:11px;fill:#6b5d4f;font-weight:600;text-anchor:middle}
.plan-force{stroke:var(--accent);stroke-width:2}
.plan-force .ar-line{stroke:var(--accent);stroke-width:2}
.plan-forcelbl{font-size:11px;font-weight:700;fill:var(--accent-700)}
.plan-com{fill:var(--wood-900)}
.plan-marklbl{font-size:10.5px;fill:var(--wood-900);font-weight:600}
.plan-crline{stroke:#0369a1;stroke-width:2.4}

/* results */
.result-chips{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:1.2rem}
.floor-result{border:1px solid var(--line);border-radius:12px;margin-bottom:1.2rem;overflow:hidden;background:#fff}
.floor-result-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  padding:.7rem 1rem;background:#f3ece2;border-bottom:1px solid var(--line)}
.floor-result-head h3{margin:0;font-size:1.05rem;color:var(--wood-900);display:flex;align-items:center;gap:.6rem}
.tag{font-size:.7rem;text-transform:uppercase;letter-spacing:.4px;padding:.15rem .5rem;border-radius:999px;font-weight:700}
.tag-rigid{background:#e0f2fe;color:#075985} .tag-flexible{background:#fef3c7;color:#92600a}
.floor-meta{display:flex;gap:1rem;flex-wrap:wrap;font-size:.82rem;color:var(--muted)}
.result-table{width:100%;border-collapse:collapse;font-size:.88rem}
.result-table th{background:var(--wood-900);color:#fff;text-align:right;padding:.5rem .7rem;font-size:.74rem;
  text-transform:uppercase;letter-spacing:.3px}
.result-table th:first-child,.result-table th:nth-child(2){text-align:left}
.result-table td{padding:.45rem .7rem;border-top:1px solid var(--line);text-align:right;
  font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace}
.result-table td.w-id-cell{text-align:left;font-weight:700;font-family:inherit;color:var(--wood-900)}
.result-table td.row-actions{text-align:center}
.floor-links{display:flex;gap:.7rem;flex-wrap:wrap;padding:.8rem 1rem;border-top:1px solid var(--line)}
.report-detail{padding:1rem;border-top:1px solid var(--line);background:#fbf8f3}

/* ===== workspace: in-app tab bar (no page reloads) ===== */
.workspace{margin-top:.4rem}
.ws-tabs{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap;border-bottom:2px solid var(--line);
  margin-bottom:1.2rem;padding-bottom:0}
.ws-tab{position:relative;border:1px solid transparent;border-bottom:none;background:transparent;
  padding:.6rem 1rem;border-radius:9px 9px 0 0;cursor:pointer;font-weight:600;font-size:.9rem;
  color:var(--wood-700);margin-bottom:-2px;white-space:nowrap}
.ws-tab:hover{background:#f3ece2;color:var(--wood-900)}
.ws-tab.on{background:#fff;border-color:var(--line);border-bottom:2px solid #fff;color:var(--accent-700)}
.ws-tab-el{font-weight:600}
.ws-tab-el::before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:.45rem;
  vertical-align:middle;background:var(--accent)}
.ws-tab-diaphragm::before{background:#0f766e}
.ws-tab-3d{margin-left:auto;color:#0369a1}
.ws-tab-3d.on{color:#0369a1}
.ws-tab-sep{width:1px;height:22px;background:var(--line);margin:0 .3rem}
.ws-pane{display:none}
.ws-pane.on{display:block;animation:wsFade .14s ease}
@keyframes wsFade{from{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}

/* ===== embedded per-element calculator panes ===== */
.alert.ok-note{background:var(--ok-bg);border:1px solid #86efac;color:#14532d}
.ok-note b{color:var(--ok)}
.el-tools{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap;margin:.4rem 0 1rem;
  padding:.7rem .9rem;background:var(--bg);border:1px solid var(--line);border-radius:10px}
.el-tools .btn-ghost{margin-left:auto}
.el-form{margin-top:.4rem}
.el-report{margin-top:1.4rem}

/* ===== diaphragm shape controls ===== */
.shape-controls{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;margin-bottom:.9rem;
  padding:.7rem .9rem;background:var(--bg);border:1px solid var(--line);border-radius:10px}
.shape-controls select{border:1px solid var(--line);border-radius:7px;padding:.4rem .5rem;
  font-size:.88rem;color:var(--ink);background:#fff}
.shape-controls .help{flex-basis:100%;color:var(--muted);font-size:.76rem;margin-top:.1rem}

/* draggable plan handles (SVG rects) */
.plan-handle{fill:#fff;stroke:var(--accent);stroke-width:1.6;cursor:grab;rx:2}
.plan-handle:hover{fill:var(--accent)}
.plan-handle-vtx{stroke:#0369a1;fill:#fff}
.plan-handle-vtx:hover{fill:#0369a1}
.lg-vtx{background:#fff;border:2px solid #0369a1;width:10px;height:10px;border-radius:2px}

/* ===== 3D view ===== */
.threed-tools{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.check-inline{display:flex;align-items:center;gap:.35rem;font-size:.85rem;color:var(--wood-700);font-weight:500}
.check-inline input{width:auto}
.threed-stage{width:100%;height:560px;border:1px solid var(--line);border-radius:14px;overflow:hidden;
  background:linear-gradient(180deg,#fbfaf7,#f1ece4);box-shadow:var(--shadow);margin-top:.4rem}
.threed-stage canvas{display:block;width:100%;height:100%}

@media (max-width:880px){
  .layout-grid{grid-template-columns:1fr}
  .assembly-grid{grid-template-columns:1fr}
  .threed-stage{height:420px}
}
@media (max-width:640px){
  .topnav{display:none}.field-wide{grid-column:span 1}.st-label{width:auto}
  .module-head{flex-direction:column;align-items:flex-start}
  .bld-tools{margin-left:0}
}
@media print{
  .topbar,.footer,.design-form,.calc-toolbar{display:none}
  .report{margin:0}body{background:#fff}
}

/* ============================================================ *
 *  Artistic landing — parallax wood structure                   *
 * ============================================================ */
.landing{position:relative;z-index:1;margin:-2rem -1.5rem -4rem}     /* break out of .container padding */

/* fixed full-bleed scene behind the content */
.woodscape{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;background:#f3d9bf}
.woodscape .layer{position:absolute;left:0;right:0;top:-8%;bottom:-8%;will-change:transform}
.woodscape .layer svg{width:100%;height:100%;display:block}
.woodscape-veil{position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(247,244,239,0) 38%,rgba(247,244,239,.35) 70%,var(--bg) 100%)}

/* sun rays + drifting sawdust motes */
@keyframes sunspin{to{transform:rotate(360deg)}}
.woodscape .sun-rays{transform-box:fill-box;transform-origin:center;animation:sunspin 120s linear infinite}
@keyframes mote{
  0%{transform:translate3d(0,0,0);opacity:0}
  10%{opacity:.85}
  90%{opacity:.5}
  100%{transform:translate3d(var(--mx,20px),var(--my,-120px),0);opacity:0}
}
.mote{animation:mote var(--md,16s) ease-in-out infinite;animation-delay:var(--mdl,0s)}

/* hero overlaid on the scene */
.hero-art{position:relative;z-index:2;min-height:calc(100vh - 60px);
  display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem 1.5rem}
.hero-art-inner{max-width:680px}
.hero-art-title{font-size:clamp(3rem,9vw,6.2rem);line-height:.98;margin:.4rem 0 .8rem;
  font-weight:800;letter-spacing:-1.5px;
  background:linear-gradient(160deg,var(--wood-900),var(--wood-700) 45%,var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 2px 30px rgba(255,255,255,.45)}
.hero-art-sub{font-size:clamp(1.02rem,2.2vw,1.28rem);color:var(--wood-900);
  max-width:560px;margin:0 auto;font-weight:500;
  text-shadow:0 1px 12px rgba(247,244,239,.9)}
.edition-pill.glass{display:inline-block;padding:.45rem 1.1rem;border-radius:999px;
  font-size:.82rem;font-weight:700;letter-spacing:.6px;color:var(--wood-900);
  background:rgba(255,255,255,.45);border:1px solid rgba(255,255,255,.7);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:0 6px 24px rgba(58,37,21,.12)}
.scroll-cue{display:inline-flex;flex-direction:column;align-items:center;gap:.2rem;margin-top:2.4rem;
  color:var(--wood-700);font-weight:700;font-size:.8rem;letter-spacing:1.5px;text-transform:uppercase}
.scroll-chev{width:26px;height:26px;fill:none;stroke:var(--accent);stroke-width:2.4;
  stroke-linecap:round;stroke-linejoin:round;animation:cuebob 1.8s ease-in-out infinite}
@keyframes cuebob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

/* choice section — frosted panel that rises over the scene */
.choose{position:relative;z-index:2;margin-top:6vh;padding:3rem 1.5rem 4rem;
  background:linear-gradient(180deg,rgba(247,244,239,.72),var(--bg) 22%);
  backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px);
  border-top:1px solid rgba(255,255,255,.6);border-radius:30px 30px 0 0;
  box-shadow:0 -20px 60px rgba(58,37,21,.10)}
.choose-head{text-align:center;max-width:1080px;margin:0 auto 1.6rem}
.choose-head .kicker{display:inline-block;font-size:.78rem;font-weight:800;letter-spacing:2px;
  text-transform:uppercase;color:var(--accent);margin-bottom:.4rem}
.choose-head h2{font-size:clamp(1.6rem,4vw,2.3rem);color:var(--wood-900);margin:0}
.choose .section-grid{max-width:1080px;margin:0 auto}

/* card reveal on scroll */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  .woodscape .layer{transform:none !important}
  .sun-rays,.mote,.scroll-chev{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
}