* { box-sizing: border-box; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  margin: 0;
  background: #eef1f5;
  color: #1f2933;
  line-height: 1.5;
}
header {
  background: #1f3a5f;
  color: #fff;
  padding: 16px 18px;
}
header h1 { margin: 0; font-size: 18px; }
header p { margin: 4px 0 0; font-size: 13px; opacity: .85; }
main { max-width: 780px; margin: 0 auto; padding: 16px; }

.tarjeta {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08);
}
.tarjeta h2 { margin: 0 0 12px; font-size: 15px; color: #1f3a5f; }

label { display: block; font-size: 13px; font-weight: 600; margin: 10px 0 4px; }
textarea, input[type="text"], select {
  width: 100%;
  padding: 10px;
  border: 1px solid #c3ccd6;
  border-radius: 8px;
  font: inherit;
  font-size: 14px;
}
textarea { min-height: 130px; resize: vertical; }
input[type="file"] { width: 100%; font-size: 13px; margin-top: 4px; }
.fila { display: flex; gap: 10px; flex-wrap: wrap; }
.fila > div { flex: 1 1 200px; }

button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 8px;
  padding: 12px 16px;
  cursor: pointer;
  background: #1f3a5f;
  color: #fff;
  width: 100%;
  margin-top: 12px;
  font-size: 15px;
}
button.secundario { background: #e2e8f0; color: #1f3a5f; }
button:disabled { opacity: .5; cursor: default; }

.estado { font-size: 13px; margin-top: 10px; min-height: 18px; }
.estado.error { color: #b91c1c; }
.estado.ok { color: #15803d; }

.avisos {
  background: #fef3c7;
  border: 1px solid #f59e0b;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  margin-bottom: 12px;
}
.avisos ul { margin: 6px 0 0; padding-left: 18px; }

.previsualizacion {
  background: #fff;
  border: 1px solid #d5dbe2;
  border-radius: 8px;
  padding: 22px;
  margin-top: 10px;
  overflow-x: auto;
}
.previsualizacion [contenteditable="true"] { outline: 1px dashed #b7c3d0; outline-offset: 2px; }
.oculto { display: none; }
.nota { font-size: 12px; color: #64748b; margin-top: 6px; }