:root {
    --primary-color: #2563eb; /* Azul moderno */
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --bg-body: #f8fafc;
    --text-main: #1e293b;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 40px 20px;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    background-color: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

h2 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 400;
}

/* Estilizado del Select */
select {
    display: block;
    margin: 0 auto 40px auto;
    padding: 12px 16px;
    font-size: 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background-color: #fff;
    color: var(--text-main);
    transition: all 0.3s ease;
    width: 100%;
    max-width: 600px;
    outline: none;
    cursor: pointer;
}

select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Tabla Moderna */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
}

th {
    background-color: #f1f5f9;
    color: var(--secondary-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    padding: 15px;
    text-align: left;
    border-bottom: 2px solid #e2e8f0;
}

td {
    padding: 14px 15px;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.95rem;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: #f8fafc;
    color: var(--primary-color);
}

/* Estados de carga y error */
.resultado {
    margin-top: 30px;
    animation: fadeIn 0.5s ease;
}

.cargando {
    text-align: center;
    color: var(--primary-color);
    font-weight: 600;
    padding: 20px;
}

.error {
    color: #b91c1c;
    background-color: #fef2f2;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #fee2e2;
    text-align: center;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}