/* Configuración General y Reset */
* {
    margin: 0;
    padding: 0;
    box-box: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #121824;
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Encabezado */
.app-header {
    text-align: center;
    padding: 2rem 1rem;
    background-color: #1a2333;
    border-bottom: 2px solid #2d3d5a;
}

.app-header h1 {
    color: #38bdf8;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.app-header .subtitle {
    color: #94a3b8;
    font-size: 1.1rem;
}

/* Grid del Cuadro de Mando (Dashboard) */
.dashboard-grid {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* En monitores medianos/grandes se divide en columnas */
@media (min-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr 2fr;
    }
    .stats-card {
        grid-column: 1 / 2;
    }
    .history-card {
        grid-column: 2 / 3;
        grid-row: 1 / 3;
    }
}

/* Estilos de las Tarjetas (Cards) */
.card {
    background-color: #1e293b;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    border: 1px solid #334155;
}

.card h2 {
    color: #f1f5f9;
    font-size: 1.3rem;
    margin-bottom: 1.2rem;
    border-bottom: 1px solid #334155;
    padding-bottom: 0.5rem;
}

/* Formularios y Botones */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #94a3b8;
}

input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    background-color: #0f172a;
    border: 1px solid #475569;
    border-radius: 6px;
    color: #fff;
    font-size: 1rem;
}

.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background-color: #38bdf8;
    color: #0f172a;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: #7dd3fc;
}

.resultado-box {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
}

/* Tablas */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 0.75rem;
    border-bottom: 1px solid #334155;
}

th {
    color: #94a3b8;
    font-weight: 600;
}

/* Bloques de Estadísticas */
.stat-item {
    background-color: #0f172a;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    text-align: center;
}

.stat-label {
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: #38bdf8;
}

/* Pie de página pegado abajo (Sticky Footer) */
.app-footer {
    background-color: #1a2333;
    padding: 1rem;
    text-align: center;
    color: #64748b;
    font-size: 0.85rem;
    border-top: 2px solid #2d3d5a;
    margin-top: auto; /* Empuja el footer al fondo */
}

.hidden {
    display: none !important;
}