/* Concrete Pad Planner — follows the BuildPlanners planner design system (tokens, topbar, controls,
   viewer, cards, alerts, tables) from garage-shelves / tote-rack. */
:root{
  --bg:#f4f1ec; --panel:#ffffff; --panel-2:#faf8f5; --ink:#1f1d1a; --ink-2:#5d574f; --ink-3:#6b655c;
  --line:#e4ded5; --accent:#e0602a; --accent-ink:#fff; --accent-soft:#fdeee6;
  --ok:#2f8a4c; --warn:#b7791f; --err:#c0392b;
  --viewer-top:#fbfaf8; --viewer-bot:#e7e1d8; --paper:#ffffff;
  --shadow:0 1px 2px rgba(0,0,0,.05),0 4px 16px rgba(0,0,0,.05);
  --radius:12px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#16171a; --panel:#1f2125; --panel-2:#25282d; --ink:#ecebe8; --ink-2:#b4afa7; --ink-3:#a29d94;
    --line:#33363c; --accent:#f07a45; --accent-soft:#3a271e; --paper:#1f2125;
    --viewer-top:#2a2d33; --viewer-bot:#17181b;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 16px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"]{
  --bg:#16171a; --panel:#1f2125; --panel-2:#25282d; --ink:#ecebe8; --ink-2:#b4afa7; --ink-3:#a29d94;
  --line:#33363c; --accent:#f07a45; --accent-soft:#3a271e; --paper:#1f2125;
  --viewer-top:#2a2d33; --viewer-bot:#17181b;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:14px/1.45 Inter,system-ui,sans-serif;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit;color:inherit}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace}
.print-only{display:none}

/* DIY disclaimer strip (above the 3D view) */
.diy-banner{display:flex;gap:8px;align-items:flex-start;padding:6px 10px;border-radius:9px;font-size:12px;line-height:1.35;color:var(--ink);
  background:color-mix(in srgb,var(--warn) 9%,var(--panel));border:1px solid color-mix(in srgb,var(--warn) 40%,transparent)}
.diy-banner i{font-style:normal;font-weight:700;width:16px;height:16px;border-radius:50%;display:grid;place-items:center;font-size:10px;flex:none;color:#fff;background:var(--warn);margin-top:1px}
.diy-banner b{color:color-mix(in srgb,var(--warn) 70%,var(--ink))}
.link{background:none;border:0;padding:0;color:var(--accent);text-decoration:underline;cursor:pointer;font:inherit}

/* top bar */
.topbar{display:flex;align-items:center;gap:16px;padding:12px 20px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);display:grid;place-items:center;color:#fff}
.brand h1{font-size:17px;margin:0;letter-spacing:-.01em}
.brand p{margin:0;font-size:12px;color:var(--ink-3)}
.brand .hub-link{color:var(--ink-2);font-weight:600;text-decoration:none}
.brand .hub-link:hover{color:var(--accent)}
.brand .hub-link .tld{color:var(--accent)}
.quick{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.quick .btn.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent)}
.quick .btn.active::before{content:"✓ "}
.btn{border:1px solid var(--line);background:var(--panel);padding:7px 12px;border-radius:8px;cursor:pointer;font-weight:500;font-size:13px;white-space:nowrap}
.btn:hover{border-color:var(--ink-3)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.4;cursor:default}
.btn:disabled:hover{border-color:var(--line)}
.actions{display:flex;gap:6px;flex-wrap:wrap}
.theme-btn{display:inline-flex;align-items:center;gap:6px}
.theme-btn .i-sun{display:none}
.theme-btn.is-dark .i-sun{display:inline}
.theme-btn.is-dark .i-moon{display:none}

/* layout */
.layout{display:grid;grid-template-columns:340px minmax(0,1fr);gap:16px;padding:16px;max-width:1700px;margin:0 auto}
@media (max-width:960px){.layout{grid-template-columns:1fr;padding:12px 16px}}
aside.controls{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);align-self:start;position:sticky;top:76px;max-height:calc(100vh - 92px);overflow:auto}
@media (max-width:960px){aside.controls{position:static;max-height:none}}
/* phones & tablets: header scrolls away and its button rows swipe sideways; the 3D model + warnings come first */
@media (max-width:960px){
  .topbar{position:static;gap:10px;padding:10px 14px}
  .brand{width:100%}
  .quick,.actions{flex-wrap:nowrap;overflow-x:auto;width:100%;scrollbar-width:none;-webkit-overflow-scrolling:touch;padding-bottom:2px}
  .quick::-webkit-scrollbar,.actions::-webkit-scrollbar{display:none}
  .quick>*,.actions>*{flex:none}
  .layout>main{display:contents}
  .layout>main>*{order:4}
  .layout>main>.diy-banner,.layout>main>.viewer-card{order:1}
  .layout>main>#alertsCard{order:2}
  .layout>aside.controls{order:3}
}
details.sec{border-bottom:2px solid var(--accent)}
details.sec:last-child{border-bottom:0}
details.sec>summary{list-style:none;cursor:pointer;padding:12px 16px;font-weight:700;font-size:calc(14px + 2pt);text-transform:uppercase;letter-spacing:.04em;color:var(--accent);display:flex;align-items:center;gap:8px;user-select:none}
details.sec>summary::-webkit-details-marker{display:none}
details.sec>summary::after{content:"";margin-left:auto;width:8px;height:8px;border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(45deg);transition:transform .15s}
details.sec[open]>summary::after{transform:rotate(-135deg)}
.sec-body{padding:0 16px 14px;display:grid;gap:10px}
.field{display:grid;grid-template-columns:1fr 150px;align-items:center;gap:8px}
.field[hidden]{display:none}
.field.wide{grid-template-columns:1fr}
.field label{font-size:13px;color:var(--ink)}
.field .hint{display:block;font-size:11px;color:var(--ink-3);line-height:1.3}
.inp{display:flex;align-items:center;border:1px solid var(--line);border-radius:8px;background:var(--panel-2);overflow:hidden}
.inp:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.inp input{border:0;background:transparent;padding:6px 8px;width:100%;min-width:0;outline:none;font-family:"JetBrains Mono",monospace;font-size:13px}
.inp .unit{padding:0 8px;color:var(--ink-3);font-size:12px}
.txt{border:1px solid var(--line);border-radius:8px;background:var(--panel-2);padding:6px 8px;outline:none;width:100%}
.txt:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
select{width:100%;border:1px solid var(--line);border-radius:8px;background:var(--panel-2);padding:6px 8px;outline:none}
select:focus{border-color:var(--accent)}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel-2)}
.seg button{flex:1;border:0;background:transparent;padding:6px 6px;cursor:pointer;font-size:12px}
.seg button.on{background:var(--accent);color:var(--accent-ink)}
.switch{position:relative;width:40px;height:22px;justify-self:end}
.switch input{opacity:0;width:0;height:0}
.switch span{position:absolute;inset:0;background:var(--line);border-radius:22px;cursor:pointer;transition:.15s}
.switch span::before{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.15s;box-shadow:0 1px 2px rgba(0,0,0,.2)}
.switch input:checked+span{background:var(--accent)}
.switch input:checked+span::before{transform:translateX(18px)}
.switch input:focus-visible+span{box-shadow:0 0 0 3px var(--accent-soft)}
.note{font-size:11px;color:var(--ink-3);background:var(--panel-2);border-radius:8px;padding:8px 10px}
details.ref{border:1px solid var(--line);border-radius:10px;background:var(--panel-2);padding:0 10px}
details.ref>summary{cursor:pointer;font-weight:600;font-size:13px;padding:9px 0}

/* main */
main{display:grid;gap:16px;min-width:0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px;min-width:0}
.card h2{font-size:15px;margin:0 0 12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.card h2 small{font-weight:400;color:var(--ink-3);font-size:12px}
.viewer-card{padding:0;overflow:hidden}
#viewer{position:relative;height:min(62vh,580px);min-height:360px;background:linear-gradient(var(--viewer-top),var(--viewer-bot));touch-action:none}
#viewer canvas{display:block;width:100%;height:100%;cursor:grab}
#viewer canvas:active{cursor:grabbing}
#viewer .labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.dim-label{position:absolute;transform:translate(-50%,-50%);font:600 12px "JetBrains Mono",monospace;background:var(--paper);color:var(--accent);border:1px solid var(--accent);padding:1px 6px;border-radius:5px;white-space:nowrap;box-shadow:0 1px 3px rgba(0,0,0,.15)}
.v3-msg{position:absolute;inset:0;display:grid;place-items:center;margin:0;padding:24px;text-align:center;color:var(--ink-3)}
.v3-msg[hidden]{display:none}
.vbar{position:absolute;left:12px;right:12px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;pointer-events:none}
.vbar>*{pointer-events:auto}
.vbar.top{top:12px}
.vbar.bot{bottom:12px;justify-content:space-between}
.pill{display:flex;background:color-mix(in srgb,var(--panel) 88%,transparent);backdrop-filter:blur(6px);border:1px solid var(--line);border-radius:9px;overflow:hidden;box-shadow:var(--shadow)}
.pill button{border:0;background:transparent;padding:6px 10px;cursor:pointer;font-size:12px;font-weight:500}
.pill button:hover{background:var(--line)}
.pill button.on{color:var(--accent)}
.pill label{display:flex;align-items:center;gap:8px;padding:4px 10px;font-size:12px}
.pill label[hidden]{display:none}
.pill input[type=range]{width:110px;accent-color:var(--accent)}
.pill output{font:11px "JetBrains Mono",monospace;color:var(--ink-3);min-width:32px;text-align:right}
.pill.sliders{flex-wrap:wrap}
.pill.sliders input[type=range]{width:80px}
@media (max-width:560px){.pill{flex-wrap:wrap}}
.hintline{font-size:11px;color:var(--ink-3);background:color-mix(in srgb,var(--panel) 80%,transparent);padding:4px 8px;border-radius:6px}
.viewer-foot{display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center;justify-content:space-between;padding:8px 16px;border-top:1px solid var(--line)}
.viewer-foot .hintline{background:none;padding:0}
.v3-legend{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:center;font-size:11px;color:var(--ink-2)}
.v3-legend:empty{display:none}
.v3-legend span{display:inline-flex;align-items:center;gap:5px}
.v3-legend i{width:10px;height:10px;border-radius:3px;border:1px solid rgba(0,0,0,.25)}
@media print{.viewer-foot{display:none}}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));border-top:1px solid var(--line)}
.stat{padding:12px 16px;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat b{display:block;font:600 17px "JetBrains Mono",monospace;letter-spacing:-.02em}
.stat span{font-size:11px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.04em}
.stat small{display:block;font-size:11px;color:var(--ink-3)}

.alerts{display:grid;gap:6px}
.alert{display:flex;gap:10px;align-items:flex-start;padding:9px 12px;border-radius:9px;font-size:13px;border:1px solid}
.alert i{font-style:normal;font-weight:700;width:18px;height:18px;border-radius:50%;display:grid;place-items:center;font-size:11px;flex:none;color:#fff;margin-top:1px}
.alert.err{border-color:color-mix(in srgb,var(--err) 40%,transparent);background:color-mix(in srgb,var(--err) 9%,transparent)}
.alert.err i{background:var(--err)}
.alert.warn{border-color:color-mix(in srgb,var(--warn) 40%,transparent);background:color-mix(in srgb,var(--warn) 9%,transparent)}
.alert.warn i{background:var(--warn)}
.alert.info{border-color:var(--line);background:var(--panel-2)}
.alert.info i{background:var(--ink-3)}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:8px}
.kv div{background:var(--panel-2);border-radius:8px;padding:8px 12px;display:flex;justify-content:space-between;gap:8px;align-items:baseline}
.kv div span{color:var(--ink-2);font-size:12px}
.kv div b{font-family:"JetBrains Mono",monospace;font-size:13px;white-space:nowrap}

.plans{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:1100px){.plans{grid-template-columns:1fr}}
.plan-box{background:var(--panel-2);border-radius:10px;padding:10px;min-width:0;position:relative}
.plan-box h3{margin:0 0 6px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-3)}
.plan-zoom{position:absolute;left:8px;bottom:8px;width:30px;height:30px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink-2);font-size:16px;line-height:1;cursor:pointer;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.plan-zoom:hover,.plan-zoom:focus-visible{border-color:var(--accent);color:var(--accent);outline:none}
/* drawings sit on a white sheet in both themes */
svg.drawing{width:100%;height:auto;display:block;background:#fff;border-radius:6px}
dialog#zoomDlg{width:calc(100vw - 32px);height:calc(100vh - 32px);max-width:none;max-height:none;padding:0;border:1px solid var(--line);border-radius:14px;background:var(--panel-2);color:var(--ink);box-shadow:0 20px 60px rgba(0,0,0,.3)}
dialog#zoomDlg[open]{display:flex;flex-direction:column}
dialog#zoomDlg::backdrop{background:rgba(0,0,0,.5)}
.zoom-head{display:flex;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--panel)}
.zoom-head h2{margin:0;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-2);flex:1}
.zoom-body{flex:1;min-height:0;display:grid;place-items:center;padding:16px;overflow:auto}
.zoom-body svg.drawing{width:100%;height:100%;max-height:none}

table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:7px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3);font-weight:600}
td.n,th.n{text-align:right;font-family:"JetBrains Mono",monospace;white-space:nowrap}
td.m{font-family:"JetBrains Mono",monospace;white-space:nowrap}
td.note{color:var(--ink-3);font-size:12px}
tr.group td{background:var(--panel-2);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3)}
.tbl-wrap{overflow-x:auto}
.price-in{width:84px;text-align:right;border:1px solid var(--line);border-radius:6px;background:var(--panel-2);padding:3px 6px;font-family:"JetBrains Mono",monospace;font-size:12px}
.price-in:focus{outline:none;border-color:var(--accent)}
.price-in.pct{width:56px}
td.price{white-space:nowrap}
td.price .per{font-size:11px;color:var(--ink-3);margin-left:4px}
tr.total td{font-weight:700;border-bottom:0;font-size:14px}
tfoot td{border-bottom:0}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:1100px){.two{grid-template-columns:1fr}}
ul.hw{margin:0;padding-left:18px;display:grid;gap:4px}
ol.steps{margin:0;padding-left:20px;display:grid;gap:8px}
ol.steps b{display:block}
.about p{color:var(--ink-2);max-width:900px;margin:0 0 12px}
.about-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:6px 0 18px}
.about-grid>div{background:var(--panel-2);border-radius:10px;padding:12px 14px}
.about-grid h3{margin:0 0 4px;font-size:14px;color:var(--accent)}
.about-grid p{margin:0;font-size:13px}
.faq-title{margin-top:4px}
.faq details{border-top:1px solid var(--line);padding:10px 2px}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:600}
.faq details p{margin:8px 0 0;font-size:13px}

.disclaimer-card{border-color:color-mix(in srgb,var(--err) 45%,transparent)}
.disclaimer-card h2{color:var(--err)}
.disc-text p{margin:0 0 10px;font-size:13px}
.disc-text ul{margin:0;padding-left:20px;font-size:13px;display:grid;gap:4px}

dialog.modal{width:min(640px,calc(100vw - 32px));max-height:calc(100vh - 48px);padding:0;border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--ink);box-shadow:0 20px 60px rgba(0,0,0,.3);overflow:auto}
dialog.modal::backdrop{background:rgba(0,0,0,.5)}
.disc{padding:20px}
.disc h2{margin:0 0 10px;font-size:18px;color:var(--err)}
.disc-body{max-height:48vh;overflow:auto;font-size:13px;border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:var(--panel-2)}
.disc-body p{margin:0 0 10px}
.disc-body ul{margin:0;padding-left:20px;display:grid;gap:4px}
.ack{display:grid;grid-template-columns:auto 1fr;gap:10px;margin:14px 0;font-size:13px;font-weight:600}
.ack input{width:18px;height:18px;margin-top:1px;accent-color:var(--accent)}
.disc-actions{display:flex;justify-content:flex-end}

footer{color:var(--ink-3);font-size:12px;text-align:center;padding:8px 16px 28px;max-width:1100px;margin:0 auto}
#printShot{display:none}
.print-footer{display:none}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:8px;font-size:13px;opacity:0;transition:.2s;pointer-events:none;z-index:50}
.toast.show{opacity:1}

@media print{
  @page{margin:12mm 12mm 16mm}
  :root{--bg:#fff;--panel:#fff;--panel-2:#fff}
  body{font-size:11px}
  .topbar,.diy-banner,aside.controls,.vbar,#viewer,footer,.promo,.plan-zoom,.bp-related,.bp-site-footer,.about,[data-slot]{display:none!important}
  .print-only{display:block}
  .print-head{border:2px solid var(--err);border-radius:8px;padding:8px 12px;margin-bottom:10px}
  .print-head h1{margin:0;font-size:18px}
  .print-head p{margin:2px 0 0;color:var(--ink-2)}
  .print-head .print-disc{color:var(--err);font-size:10px;font-weight:600;margin-top:6px}
  .layout{display:block;padding:0}
  .card{box-shadow:none;border:1px solid #ccc;break-inside:avoid;margin-bottom:10px}
  .plans-card{break-before:page}
  .plans{grid-template-columns:1fr}
  #printShot{display:block;width:100%;max-height:380px;object-fit:contain}
  .viewer-card{padding:0}
  .alert,.disclaimer-card,.print-head{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .price-in{border:0;padding:0;background:none;width:auto}
  .price-in:placeholder-shown{visibility:hidden}
  details.ref>*{display:block}
  .print-footer{display:block;position:fixed;bottom:0;left:0;right:0;font-size:8.5px;color:#a12b1c;border-top:1px solid #a12b1c;padding-top:3px;text-align:center;background:#fff}
  .draw-notes{margin-top:8px}
  .draw-notes .alerts{gap:3px}
  .draw-notes .alert{padding:4px 8px;font-size:10px}
}