/* Modern light UI */
:root{
  --bg:#f7f8fa;
  --card:#ffffff;
  --muted:#6b7280;
  --text:#111827;
  --brand:#2563eb;
  --brand-ink:#1d4ed8;
  --border:#e5e7eb;
  --ring: rgba(37,99,235,0.22);
  --radius:18px;
  --shadow:0 10px 30px rgba(0,0,0,0.06);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  color:var(--text);
  background:linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);
}

.container{max-width:1150px;margin:0 auto;padding:0 16px}

.app-header{
  position:sticky; top:0; z-index:20;
  background:rgba(255,255,255,0.75); backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;gap:10px;align-items:center}
.brand .logo{width:34px;height:34px;display:grid;place-items:center;border-radius:12px;background:var(--brand);color:#fff;font-weight:700;box-shadow:var(--shadow)}
.brand .name{font-weight:700;letter-spacing:.2px}

.header-actions{display:flex;gap:10px;align-items:center}

.app-footer{border-top:1px solid var(--border);margin-top:24px;background:#fff}
.footer-inner{display:flex;gap:14px;justify-content:space-between;align-items:center;padding:14px 0;color:var(--muted);font-size:14px}

.grid{
  display:grid;
  grid-template-columns: 1.1fr 1fr;
  grid-template-rows:auto;
  gap:18px;
  align-items:start;
}
.controls{grid-column:1}
.preview{grid-column:2}
.history{grid-column:1 / -1}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
}
.card h2{margin:0 0 12px 0;font-size:18px}

.field{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.field-row{display:grid;grid-template-columns:repeat(3, 1fr);gap:14px}
.field-row .field{margin-bottom:0}
label{font-size:13px;color:var(--muted)}
textarea, input[type="text"], select, input[type="color"], input[type="file"]{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:#fff;
  outline:none;
  font-size:14px;
  transition: box-shadow .15s ease, border-color .15s ease;
}
textarea:focus, input:focus, select:focus{
  border-color:var(--brand);
  box-shadow:0 0 0 4px var(--ring);
}

input[type="range"]{accent-color:var(--brand)}
.divider{height:1px;background:var(--border);margin:8px 0 12px}

.actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{
  appearance:none;border:1px solid var(--border);background:#fff;border-radius:12px;
  padding:10px 14px;font-weight:600;cursor:pointer;transition:all .15s ease;
  box-shadow: var(--shadow);
}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.ghost{background:transparent}
.btn.link{background:#fff}

.qr-box{
  display:grid;place-items:center;
  width:100%;min-height:340px;
  border:1px dashed var(--border);
  border-radius:16px;background:#fff;
}
#previewWrap{display:flex;flex-direction:column;gap:12px}

.hint{margin:6px 0 0 0; color:var(--muted);font-size:13px}

.history-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.history-list{display:grid;grid-template-columns:repeat(auto-fill, minmax(240px, 1fr));gap:12px}
.history-item{
  border:1px solid var(--border);border-radius:12px;padding:12px;background:#fff;display:flex;gap:10px;align-items:center;
}
.history-item .pill{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:10px;border:1px solid var(--border);padding:6px 8px;font-size:12px;background:#f9fafb;color:#111;
  overflow:hidden;white-space:nowrap;text-overflow:ellipsis;max-width:70%;
}
.history-item .mini{
  display:inline-flex;gap:8px;margin-left:auto
}
.mini .btn{padding:6px 8px;font-size:12px;box-shadow:none}

@media (max-width: 980px){
  .grid{grid-template-columns:1fr}
  .preview{order:3}
  .history{order:4}
}