.stamp-layout {
  display: grid; grid-template-columns: 380px 1fr;
  gap: 24px; align-items: start;
}
.stamp-form-panel {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 24px; box-shadow: var(--sh); display: flex; flex-direction: column; gap: 18px;
}
.rform-section { display: flex; flex-direction: column; gap: 10px; }
.rform-title {
  font-size: 11px; font-weight: 800; color: var(--text2);
  text-transform: uppercase; letter-spacing: .6px;
  padding-bottom: 6px; border-bottom: 2px solid var(--p-lt);
}
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 11px; font-weight: 600; color: var(--text2); letter-spacing: .3px; }
.field input, .field select {
  padding: 9px 12px; border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 13px; font-family: 'Inter', sans-serif; color: var(--text);
  background: #fff; outline: none; transition: border-color .18s;
}
.field input:focus, .field select:focus { border-color: var(--p); box-shadow: 0 0 0 3px rgba(105,56,239,.1); }
.field select {
  appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23667085' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; padding-right: 30px;
}

.stamp-actions { display: flex; gap: 10px; }
.preview-btn, .download-btn {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 7px;
  padding: 11px 16px; border: none; border-radius: 10px;
  font-size: 13px; font-weight: 700; font-family: 'Inter', sans-serif; cursor: pointer;
  transition: background .15s, transform .1s;
}
.preview-btn { background: var(--p-lt); color: var(--p); }
.preview-btn:hover { background: #ddd6fe; }
.download-btn { background: var(--p); color: #fff; box-shadow: 0 4px 16px rgba(105,56,239,.3); }
.download-btn:hover { background: var(--p-d); transform: translateY(-1px); }

/* Preview */
.stamp-preview-panel {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  box-shadow: var(--sh); overflow: hidden; position: sticky; top: 20px;
}
.stamp-preview-header {
  padding: 14px 20px; background: var(--p-llt); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; font-size: 13px; font-weight: 700;
}
.preview-bg-note { font-size: 10.5px; color: var(--text3); font-weight: 400; }
.stamp-canvas-area {
  display: flex; align-items: center; justify-content: center;
  padding: 32px; background: repeating-conic-gradient(#e5e7eb 0% 25%, #fff 0% 50%) 0 0 / 20px 20px;
}
#stampCanvas { display: block; border-radius: 4px; }
.stamp-hint {
  text-align: center; font-size: 12px; color: var(--text3);
  padding: 12px 20px; border-top: 1px solid var(--border);
}

@media (max-width: 960px) {
  .stamp-layout { grid-template-columns: 1fr; }
  .stamp-preview-panel { position: static; }
}
@media (max-width: 640px) {
  .stamp-form-panel { padding: 18px; }
  .stamp-actions { flex-direction: column; }
}