* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f3f6fb;
    color: #1f2937;
}

.contenedor {
    width: 90%;
    max-width: 1100px;
    margin: 30px auto;
}

.encabezado {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.07);
}

.encabezado h1 {
    margin: 0;
    font-size: 30px;
}

.encabezado p {
    margin: 8px 0 0;
    color: #6b7280;
}

.tarjeta {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.07);
}

.tarjeta h2 {
    margin-top: 0;
    margin-bottom: 20px;
}

.mensaje {
    background: #e0f2fe;
    color: #075985;
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-weight: bold;
}

.formulario-simulador {
    display: flex;
    gap: 12px;
}

.formulario-simulador input {
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    font-size: 16px;
    width: 220px;
}

.boton {
    border: none;
    text-decoration: none;
    padding: 11px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 15px;
    display: inline-block;
}

.principal {
    background: #2563eb;
    color: white;
}

.secundario {
    background: #111827;
    color: white;
}

.manual {
    background: #f59e0b;
    color: white;
}

.boton:hover {
    opacity: 0.9;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: #eff6ff;
}

th, td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

th {
    color: #1e3a8a;
}

.vacio {
    color: #6b7280;
    font-style: italic;
}