html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}
body {
    min-height: 100vh;
    background: #b3e0f7;
}
.contenedor {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background: #b3e0f7;
    min-height: 100vh;
    padding: 0;
    transition: opacity 0.3s;
}
.titulo {
    background: #d3d3d3;
    text-align: center;
    padding: 12px 0 4px 0;
    font-size: 1.3em;
    font-weight: bold;
}
.grilla {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px 24px;
}
label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
}
input, select {
    width: 100%;
    padding: 8px;
    border: 1px solid #aaa;
    font-size: 1em;
    background: #fff;
    box-sizing: border-box;
}
.acciones {
    grid-column: 1 / span 2;
    text-align: center;
    margin-top: 18px;
}
button {
    padding: 8px 32px;
    background: #d3d3d3;
    color: #222;
    border: 1px solid #aaa;
    font-size: 1em;
    cursor: pointer;
}
button:hover {
    background: #b0b0b0;
}
@media (max-width: 700px) {
  .grilla {
    grid-template-columns: 1fr;
  }
  .acciones {
    grid-column: 1 / span 1;
  }
}

.modal-bg {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.3);
    display: none;
    z-index: 1000;
}
.modal {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    padding: 32px 24px 18px 24px;
    border-radius: 8px;
    box-shadow: 0 0 20px #2225;
    min-width: 320px;
    z-index: 1001;
    display: none;
}
.modal .cerrar {
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 1.2em;
    background: none;
    border: none;
    color: #888;
    cursor: pointer;
}