/* Google Forms-like minimal styling */
:root {
  --primary: #673ab7; /* Deep purple */
  --primary-light: #ede7f6;
  --text: #202124;
  --muted: #5f6368;
  --card-bg: #fff;
  --bg: #f1f3f4;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: 'Roboto', system-ui, -apple-system, Arial, sans-serif; color: var(--text); background: var(--bg); }
.header-bar { height: 8px; background: var(--primary); }
.container { max-width: 900px; margin: 32px auto; padding: 0 16px; }
.card { background: var(--card-bg); border-radius: 8px; padding: 24px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.card h1 { margin: 0 0 8px; font-weight: 500; }
.subtitle { color: var(--muted); margin: 0 0 24px; }
.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 0.95rem; }
input[type="text"], select, input[type="file"] { width: 100%; padding: 12px; border: 1px solid #dadce0; border-radius: 6px; background: #fff; font-size: 1rem; }
input[type="text"]:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.section-sep { height: 12px; border-bottom: 1px solid #eee; margin: 16px 0 8px; }
.section-sep.thin { height: 0; margin: 8px 0; }
.child-section { padding: 8px 0; }
.child-header { display: flex; align-items: center; justify-content: space-between; }
.child-header h3 { margin: 8px 0; font-size: 1.1rem; font-weight: 500; }
.remove-child { background: transparent; border: none; font-size: 20px; color: #999; cursor: pointer; }
.child-controls { display: flex; gap: 8px; margin: 8px 0 16px; }
.actions { margin-top: 24px; }
.btn { appearance: none; border: 1px solid #dadce0; background: #fff; padding: 10px 16px; border-radius: 6px; cursor: pointer; font-weight: 500; }
.btn:hover { background: #fafafa; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { filter: brightness(0.95); }
.btn-secondary { background: #f6f6f6; }
.card.error h1 { color: #b00020; }

@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
}

/* Loading overlay */
.loading-overlay[hidden] { display: none; }
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 1000;
  text-align: center;
}
.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid #ddd;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}