body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: radial-gradient(circle at top, #225c9c 0%, #00213f 55%, #001426 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Tarjeta central */
.contenedor {
    width: 95%;
    max-width: 650px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 26px rgba(0,0,0,0.35);
    border: 1px solid #d4dbe6;
    padding: 22px 26px 26px;
}

/* Cabecera tipo oficina */
.contenedor-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
    border-bottom: 1px solid #e2e6f0;
    padding-bottom: 10px;
}

.icono-sobre {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #003666;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 22px;
}

.titulo-texto h2 {
    margin: 0;
    color: #003666;
    font-size: 22px;
}

.titulo-texto span {
    font-size: 13px;
    color: #6b7280;
}

/* Campos del formulario */
form {
    margin-top: 10px;
}

label {
    font-weight: bold;
    color: #003666;
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
}

input,
textarea {
    width: 100%;
    padding: 10px 11px;
    border: 1px solid #c7c7c7;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 12px;
    outline: none;
    transition: border 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
textarea:focus {
    border-color: #0e74ff;
    box-shadow: 0 0 0 2px rgba(14, 116, 255, 0.2);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Botón de enviar */
button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(120deg, #003666, #0e74ff);
    border: none;
    color: white;
    font-size: 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.25s;
    margin-top: 4px;
}

button:hover {
    background: linear-gradient(120deg, #0e74ff, #23a6ff);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}

/* Enlace de volver */
.volver {
    display: inline-block;
    margin-top: 12px;
    font-size: 13px;
    color: #003666;
    text-decoration: none;
}

.volver:hover {
    text-decoration: underline;
}

/* Mensajes de estado */
.alerta {
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    font-size: 14px;
    text-align: center;
}

.alerta.ok {
    background: #d6ffe0;
    color: #0a7a2f;
    border: 1px solid #0a7a2f;
}

.alerta.error {
    background: #ffe1e1;
    color: #a02121;
    border: 1px solid #a02121;
}

/* Responsive */
@media (max-width: 480px) {
    .contenedor {
        padding: 18px 16px 20px;
    }

    .titulo-texto h2 {
        font-size: 18px;
    }
}