:root{
  --paper:#E6ECEF; --panel:#F5F7F8; --ink:#1C2730; --ink-2:#55636E; --line:#C8D1D7;
  --accent:#2F5D8A; --accent-ink:#FFFFFF; --select:#D38B17; --canvas:#DFE6EA;
  --grid-minor:#C6D0D6; --grid-major:#93A6B3; --warn:#9A4A12; --ok:#2E6B3F;
  color-scheme:light;
  box-sizing:border-box; padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){ :root:not([data-theme="light"]){
  --paper:#11171C; --panel:#172027; --ink:#DCE4EA; --ink-2:#94A4B0; --line:#2B3842;
  --accent:#7FA9D6; --accent-ink:#0E1A26; --select:#E9AB3E; --canvas:#0E1418;
  --grid-minor:#1D2931; --grid-major:#3A4D5A; --warn:#E59A5B; --ok:#7CC48F; color-scheme:dark;}}
:root[data-theme="dark"]{
  --paper:#11171C; --panel:#172027; --ink:#DCE4EA; --ink-2:#94A4B0; --line:#2B3842;
  --accent:#7FA9D6; --accent-ink:#0E1A26; --select:#E9AB3E; --canvas:#0E1418;
  --grid-minor:#1D2931; --grid-major:#3A4D5A; --warn:#E59A5B; --ok:#7CC48F; color-scheme:dark;}
*,*::before,*::after{box-sizing:inherit}
html{height:100%;scroll-padding-top:env(safe-area-inset-top,0px)}
body{height:100%;margin:0;background:var(--paper);color:var(--ink);
  font-family:"Barlow",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:15px;line-height:1.45}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.app{height:100%;display:grid;grid-template-rows:auto 1fr}
header{display:flex;align-items:center;gap:14px;padding:10px 16px;border-bottom:1px solid var(--line);background:var(--panel);flex-wrap:wrap}
.brand{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:22px;letter-spacing:.01em;margin-right:6px}
.brand span{color:var(--ink-2);font-weight:500}
header select{background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:6px 10px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{background:transparent;border:0;padding:6px 12px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink)}
.spacer{flex:1}
.main{display:grid;grid-template-columns:360px 1fr;min-height:0}
aside{border-right:1px solid var(--line);background:var(--panel);display:flex;flex-direction:column;min-height:0}
.tabs{display:flex;border-bottom:1px solid var(--line)}
.tabs button{flex:1;background:none;border:0;border-bottom:2px solid transparent;padding:10px 4px;cursor:pointer;color:var(--ink-2)}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent);font-weight:500}
.pane{padding:16px 18px 28px;overflow:auto;flex:1}
.pane[hidden]{display:none}
.pane h2{font-size:17px;font-weight:600;margin:0 0 4px}
.pane p.hint{margin:0 0 16px;color:var(--ink-2);font-size:14px}
.row{margin-bottom:14px}
.row label{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;margin-bottom:4px}
.row .ctrl{display:grid;grid-template-columns:1fr 84px;gap:10px;align-items:center}
.row input[type=range]{width:100%;accent-color:var(--accent)}
.row input[type=number],.row select{width:100%;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:5px 8px;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-size:16px}
.row select{font-family:inherit;font-size:14px}
.unit{color:var(--ink-2);font-size:13px}
.readout{border-top:1px solid var(--line);margin-top:18px;padding-top:14px}
.kv{display:flex;justify-content:space-between;padding:5px 0;border-bottom:1px dashed var(--line)}
.kv b{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:18px}
.note{font-size:14px;margin:10px 0 0;padding:8px 10px;border-left:3px solid var(--warn);background:color-mix(in srgb,var(--warn) 9%,transparent)}
.note.ok{border-left-color:var(--ok);background:color-mix(in srgb,var(--ok) 9%,transparent)}
.btn{background:var(--accent);color:var(--accent-ink);border:0;border-radius:6px;padding:8px 14px;cursor:pointer;font-weight:500}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
table{width:100%;border-collapse:collapse;font-size:14px}
th{text-align:left;font-weight:500;color:var(--ink-2);border-bottom:1px solid var(--line);padding:6px 4px}
td{padding:8px 4px;border-bottom:1px solid var(--line);vertical-align:top}
td.num{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-size:16px;white-space:nowrap}
tr.sel td{background:color-mix(in srgb,var(--select) 18%,transparent)}
tr[data-part]{cursor:pointer}
td small{color:var(--ink-2);display:block}
table.mat td{vertical-align:middle}
table.mat td:last-child,table.mat th:last-child{text-align:right}
input.price{width:64px;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:3px 6px;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-size:15px}
ol.steps{padding-left:22px;margin:0}
.saves{border-top:1px solid var(--line);margin-top:20px;padding-top:14px}
.saves h3{font-size:15px;font-weight:600;margin:0 0 4px}
.saverow{display:flex;gap:8px;margin-bottom:12px}
.saverow input{flex:1;min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:6px 8px}
.saves ul{list-style:none;margin:0 0 12px;padding:0}
.saves li{display:flex;align-items:center;gap:6px;padding:8px 0;border-bottom:1px dashed var(--line)}
.saves li span{flex:1;min-width:0}
.saves li b{display:block;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.saves li small{color:var(--ink-2);font-size:12px}
.saves li.on b{color:var(--accent)}
.saves li .btn{padding:4px 8px;font-size:13px}
.saveio{display:flex;gap:8px}
.saveio .btn{font-size:13px;padding:6px 10px}
.btn:disabled{opacity:.4;cursor:default}
ol.steps li{margin-bottom:6px;padding-left:2px}
ol.steps li::marker{color:var(--ink-2)}
ol.steps li.on::marker{color:var(--accent);font-weight:600}
ol.steps button{display:block;width:100%;text-align:left;background:none;border:1px solid transparent;border-radius:6px;padding:6px 8px;cursor:pointer;line-height:1.45}
ol.steps button:hover{background:color-mix(in srgb,var(--accent) 6%,transparent)}
ol.steps li.on button{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.stepnav{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.stepnav span{flex:1;text-align:center;font-size:14px;color:var(--ink-2)}
.stepnav .btn:disabled{opacity:.4;cursor:default}
.viewport{position:relative;min-height:0;background:var(--canvas);overflow:hidden;touch-action:none}
#gl{display:block;width:100%;height:100%}
.hud{position:absolute;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.hud.bl{left:12px;bottom:12px;right:12px}
.hud.tl{left:12px;top:12px;max-width:min(320px,calc(100% - 24px))}
.chip{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:6px 10px;cursor:pointer;font-size:14px}
.chip[aria-pressed="true"]{border-color:var(--accent);color:var(--accent);font-weight:500}
.chipgroup{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.chipgroup button{background:none;border:0;border-right:1px solid var(--line);padding:6px 10px;cursor:pointer;font-size:14px}
.chipgroup button:last-child{border-right:0}
.explode{display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:4px 10px;font-size:14px}
.explode input{width:110px;accent-color:var(--accent)}
.card{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--select);border-radius:0;padding:10px 12px;font-size:14px}
.card b{display:block;font-size:15px}
.card .dims{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-size:18px}
.card[hidden]{display:none}
.dimlabel{position:absolute;transform:translate(-50%,-50%);background:var(--canvas);color:var(--accent);
  font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:15px;padding:0 4px;pointer-events:none;white-space:nowrap}
.help{position:absolute;right:12px;top:12px;font-size:13px;color:var(--ink-2);background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:6px 10px}
@media (max-width:820px){
  .main{grid-template-columns:1fr;grid-template-rows:52vh auto;overflow:auto}
  .viewport{order:-1}
  aside{border-right:0;border-top:1px solid var(--line)}
  .help{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}