:root{
  color-scheme:light;
  --bg:#f4f3ef; --panel:#fff; --ink:#1d1d1b; --muted:#6b6a65; --line:#dedcd5;
  --accent:#d24b1f; --accent-ink:#fff; --chevron:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%236b6a65' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); --paper:#fff; --shadow:0 1px 3px rgba(0,0,0,.08),0 8px 24px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#161614; --panel:#21211e; --ink:#ecebe6; --muted:#9a9890; --line:#34332f;
    --accent:#ff6a3a; --accent-ink:#161614; --chevron:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%239a9890' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); --shadow:0 1px 3px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#161614; --panel:#21211e; --ink:#ecebe6; --muted:#9a9890; --line:#34332f;
    --accent:#ff6a3a; --accent-ink:#161614; --chevron:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%239a9890' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); --shadow:0 1px 3px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif}
button,select,input{font:inherit;color:inherit}
button{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:6px 10px;cursor:pointer}
button:hover{border-color:var(--muted)}
#btnTheme{width:34px;padding:6px 0;font-size:16px;line-height:1}
#btnSample{margin-top:8px;width:100%;background:none;border-style:dashed;color:var(--muted)}
#btnSample:hover{color:var(--ink)}
button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:600}
button:disabled{opacity:.45;cursor:default}
/* content is capped at 1440px; header padding keeps its edges in line with main */
header{display:flex;align-items:center;gap:10px;padding:12px max(16px, calc((100% - 1408px) / 2));border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:5;flex-wrap:wrap}
header h1{font-size:17px;margin:0 auto 0 0;letter-spacing:-.01em}
header h1 span{color:var(--accent)}
main{display:grid;grid-template-columns:340px 1fr;gap:16px;padding:16px;align-items:start;max-width:1440px;margin:0 auto}
/* no labels yet: just the panel, centered */
/* no labels yet: intro card instead of sheets */
body.no-labels #sheets, body:not(.no-labels) #intro{display:none}
#intro{padding:28px 32px;max-width:860px}
#intro .eyebrow{margin:0 0 6px;color:var(--accent);font-weight:600;font-size:13px}
#intro .title{margin:0 0 10px;font-size:26px;line-height:1.2;letter-spacing:-.02em;text-transform:none;color:var(--ink)}
#intro .lede{margin:0 0 20px;color:var(--muted);font-size:15px;line-height:1.55;max-width:62ch}
#intro .example{margin:0 0 20px}
#introSheet{display:block;width:100%;height:auto}
#intro figcaption{margin-top:8px;color:var(--muted);font-size:12px}
#intro .steps{margin:0 0 22px;padding-left:20px;display:grid;gap:8px;line-height:1.5}
#intro .steps strong{color:var(--ink)}
#intro .intro-foot{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
#intro .private{color:var(--muted);font-size:13px}
@media (max-width:480px){ header{gap:6px} header button{padding:6px 9px} header .wide{display:none} }
@media (max-width:820px){ #intro{order:-1;padding:20px} #intro .title{font-size:22px} }
@media (max-width:820px){main{grid-template-columns:1fr}}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px}
.panel h2{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 10px}
#drop{border:2px dashed var(--line);border-radius:10px;padding:18px;text-align:center;color:var(--muted);cursor:pointer}
#drop.over,body.dragging #drop{border-color:var(--accent);color:var(--accent)}
#drop strong{color:var(--ink)}
#list{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
#list li{display:grid;grid-template-columns:56px 1fr;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:8px}
#list canvas{width:56px;height:auto;background:var(--paper);border-radius:4px;border:1px solid var(--line)}
#list .name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#list .meta{color:var(--muted);font-size:12px}
#list .acts{display:flex;gap:4px;margin-top:6px;flex-wrap:wrap}
#list .acts button{padding:3px 7px;font-size:12px}
.settings{display:grid;gap:10px;margin-top:14px}
[hidden]{display:none!important}
.settings label{display:flex;justify-content:space-between;align-items:center;gap:8px}
.settings input[type=number]{width:72px;padding:5px 10px;border:1px solid var(--line);border-radius:6px;background:var(--bg)}
/* custom chevron so it sits 12px from the edge in every browser and theme */
select{appearance:none;-webkit-appearance:none;padding:5px 32px 5px 10px;border:1px solid var(--line);border-radius:6px;cursor:pointer;
  background-color:var(--bg);
  background-image:var(--chevron);background-position:right 12px center;background-size:10px 6px;background-repeat:no-repeat}
select:hover{border-color:var(--muted)}
.hint{color:var(--muted);font-size:12px;margin:10px 0 0}
#sheets{display:flex;flex-direction:column;gap:18px}
.sheet{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px;width:fit-content;max-width:100%}
.sheet .cap{display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:12px;margin-bottom:8px}
.sheet canvas{max-width:100%;max-height:75vh;display:block;background:var(--paper);box-shadow:var(--shadow);cursor:pointer;border-radius:2px}
.empty{color:var(--muted);text-align:center;padding:60px 20px}
dialog{border:1px solid var(--line);border-radius:14px;padding:0;background:var(--panel);color:var(--ink);width:min(1100px,96vw);max-height:94vh}
dialog::backdrop{background:rgba(0,0,0,.5)}
.ed{display:grid;grid-template-columns:1fr 260px;gap:16px;padding:16px}
@media (max-width:760px){.ed{grid-template-columns:1fr}}
.ed .src{position:relative;display:flex;justify-content:center;background:var(--bg);border-radius:8px;padding:8px}
#edCanvas{max-width:100%;max-height:72vh;touch-action:none;cursor:crosshair;background:#fff}
.ed .side{display:flex;flex-direction:column;gap:12px}
.ed .side h3{margin:0;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
#edPreview{width:100%;aspect-ratio:var(--slot-ar,5.5/8.5);background:#fff;border:1px solid var(--line);border-radius:4px}
.seg{display:flex;flex-wrap:wrap;gap:4px}
.seg button{padding:4px 8px;font-size:12px}
.seg button.on{background:var(--ink);color:var(--panel);border-color:var(--ink)}
.row{display:flex;gap:6px;flex-wrap:wrap}
.ed footer{grid-column:1/-1;display:flex;justify-content:flex-end;gap:8px}
.site-foot{max-width:1440px;margin:8px auto 0;padding:16px 16px 32px;color:var(--muted);font-size:12px;line-height:1.5;border-top:1px solid var(--line)}
.site-foot p{margin:0 0 4px;max-width:90ch}
#print-root{display:none}
@media print{
  html,body{background:#fff}
  body>*:not(#print-root){display:none!important}
  #print-root{display:block}
  #print-root img{display:block;page-break-after:always;break-after:page}
  #print-root img:last-child{page-break-after:auto;break-after:auto}
}