/* style.css -- basic responsive layout, mobile-first */
:root{
  --bg:#f7f7fb;
  --card:#ffffff;
  --line:#e5e7eb;
  --accent:#0d6efd;
  --muted:#6b7280;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:#111827}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;position:sticky;top:0;z-index:20}
.header-title{font-weight:700}
.container{max-width:1200px;margin:0 auto;padding:12px}
.grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:980px){.grid{grid-template-columns:280px 1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
h1{font-size:20px;margin:0 0 8px}
h2{font-size:16px;margin:8px 0}
.row{display:flex;gap:8px;flex-wrap:wrap}
.btn{appearance:none;border:0;background:var(--accent);color:#fff;padding:10px 12px;border-radius:10px;cursor:pointer;font-weight:600}
.btn.secondary{background:#374151}
.btn.ghost{background:#eef2ff;color:#4338ca}
.btn.warn{background:#dc2626}
.btn:disabled{opacity:.6;cursor:not-allowed}
input[type="text"],input[type="number"],textarea,select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff}
label{display:block;font-size:12px;color:var(--muted);margin:6px 0 4px}
.small{font-size:12px;color:var(--muted)}
hr{border:0;border-top:1px solid var(--line);margin:12px 0}
.list{list-style:none;margin:0;padding:0}
.list li{display:flex;align-items:center;justify-content:space-between;padding:8px;border:1px dashed var(--line);border-radius:8px;margin-bottom:6px}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;border:1px solid var(--line);padding:1px 6px;border-radius:6px;background:#f9fafb}
/* Canvas holder */
.stage-wrap{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.stage-toolbar{display:flex;align-items:center;justify-content:space-between;padding:8px;border-bottom:1px solid var(--line);gap:8px;flex-wrap:wrap;background:#fafafa}
.a4{position:relative;width:794px;height:1123px;margin:0 auto;background:#fff;touch-action:none}
@media(max-width:820px){
  .a4{width:100%;height:auto;aspect-ratio:794/1123}
}
canvas#stage{position:absolute;inset:0;width:100%;height:100%}
.badge{display:inline-block;background:#f3f4f6;border:1px solid var(--line);border-radius:999px;padding:2px 8px;font-size:12px;color:#111827}
fieldset{border:1px solid var(--line);border-radius:10px;padding:10px}
legend{padding:0 6px;color:#6b7280}
.hidden{display:none}