:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --accent-color: #198754;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa;
}

.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-accent {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.btn-accent:hover {
    opacity: 0.9;
    color: white;
}

/* Estilos de cesiumContainer movidos a flight.html para pantalla completa */
/* #cesiumContainer {
    width: 100%;
    height: 600px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
} */

.upload-zone {
    border: 2px dashed var(--primary-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    background-color: rgba(13, 110, 253, 0.02);
    transition: all 0.3s;
    cursor: pointer;
}

.upload-zone:hover {
    background-color: rgba(13, 110, 253, 0.05);
    border-color: var(--accent-color);
}

.upload-zone.dragover {
    background-color: rgba(13, 110, 253, 0.1);
    border-color: var(--accent-color);
}

.flight-list-item {
    cursor: pointer;
    transition: background-color 0.2s;
}

.flight-list-item:hover {
    background-color: #f8f9fa;
}

.loading {
    text-align: center;
    padding: 2rem;
}

.spinner-border {
    color: var(--primary-color);
}

.stats-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.stats-card h3 {
    margin: 0;
    font-size: 2rem;
    font-weight: bold;
}

.stats-card p {
    margin: 0;
    opacity: 0.9;
}