:root{
  --bg:#f8fafc; --card:#ffffff; --muted:#64748b; --text:#0f172a; --brand:#2563eb; --accent:#7c3aed;
  --border:#e2e8f0;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);
  background:linear-gradient(#fff, var(--bg));}
.topbar{position:sticky;top:0;background:#ffffffcc;backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:10;padding:12px 16px;display:flex;justify-content:space-between;gap:12px;align-items:center}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:radial-gradient(120% 120% at 0% 0%, #93c5fd, #c4b5fd)}
.logo svg{width:28px;height:28px;display:block}
.brand-text h1{margin:0;font-size:18px;font-weight:800}
.brand-text p{margin:0;color:var(--muted);font-size:12px}
.links{display:flex;gap:14px}
.links a{color:var(--text);text-decoration:none;padding:6px 10px;border-radius:999px;border:1px solid var(--border)}
.links a:hover{background:#f1f5f9}
.layout{display:flex;flex-direction:column;gap:16px;max-width:1100px;margin:0 auto;padding:16px}
.ad-slot{background:#eef2ff;border:1px dashed #c7d2fe;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#4f46e5;font-weight:600;min-height:90px}
.ad-mid{min-height:280px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;box-shadow:0 6px 22px #0f172a12;max-width:980px;margin:0 auto}
.card h2{margin-top:0}
.muted{color:var(--muted)}
.small{font-size:12px}
.grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:900px){.grid{grid-template-columns:1fr 1fr}}
.preview{background:#f1f5f9;border:1px solid var(--border);border-radius:12px;min-height:360px;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden}
.preview canvas{max-width:100%;max-height:100%;display:block;background:#fff;touch-action:none}
.filebox{display:block;border:2px dashed var(--border);border-radius:12px;padding:16px;text-align:center;color:#475569;cursor:pointer;transition:all .15s ease}
.filebox:hover{background:#f8fafc}
.filebox input{display:none}
.controls{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.controls .row{display:flex;gap:8px;align-items:center}
label{font-size:14px;color:#0f172a;display:block}
label input, select{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:#fff}
button{padding:9px 14px;border-radius:10px;border:1px solid var(--border);background:#fff;cursor:pointer;box-shadow:0 2px 8px #0f172a0a}
button:hover{background:#f8fafc}
.btnrow{display:flex;flex-wrap:wrap;gap:8px}
.meta{margin-top:8px}
.footer{padding:24px;text-align:center;color:var(--muted);border-top:1px solid var(--border)}
.footer-grid{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;max-width:1100px;margin:0 auto}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo svg{width:22px;height:22px}
.footer-links{list-style:none;display:flex;gap:12px;margin:0;padding:0}
.footer a{color:inherit;text-decoration:none}
.footer a:hover{color:#334155}

/* Responsive enhancements */
@media (max-width: 720px){
  .topbar{gap:8px; padding:10px 12px}
  .brand-text h1{font-size:16px}
  .links a{padding:6px 8px; font-size:13px}
  .grid{grid-template-columns:1fr}
  .controls{gap:8px}
  button{padding:10px 14px}
  .preview{min-height:260px}
  .ad-top{min-height:60px}
  .sticky-actions{position:sticky; bottom:0; background:#ffffffee; backdrop-filter:blur(8px); padding:10px; border:1px solid var(--border); border-radius:12px; display:flex; gap:8px; justify-content:space-between}
}
/* Ensure canvas scales in container but exports full resolution */
.preview canvas{width:100%; height:auto}
/* FAQ styles */
details{border:1px solid var(--border); border-radius:10px; padding:10px; background:#fafafa}
details + details{margin-top:8px}
details summary{cursor:pointer; font-weight:600}