:root {
    --sidebar-width: 220px;
}

body {
    background: #f5f6fa;
    font-size: 0.9rem;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card {
    border: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border-radius: 8px;
}

.card-header {
    background: transparent;
    border-bottom: 1px solid #eee;
    font-weight: 600;
}

.stat-card {
    border-radius: 10px;
    padding: 1.25rem;
    color: #fff;
    transition: transform 0.15s;
}
.stat-card:hover {
    transform: translateY(-2px);
}
.stat-card .stat-icon {
    font-size: 2rem;
    opacity: 0.8;
}
.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}
.stat-card .stat-label {
    font-size: 0.85rem;
    opacity: 0.9;
}

.table th {
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: #6c757d;
    border-top: none;
}
.table td {
    vertical-align: middle;
}

.dropzone {
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}
.dropzone:hover, .dropzone.dragover {
    border-color: #0d6efd;
    background: #f0f7ff;
}

.imei-masked {
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
}

.progress-upload {
    height: 1.5rem;
}

.badge-active {
    background: #d1f7e5;
    color: #0d8c4c;
}
.badge-inactive {
    background: #fce4e4;
    color: #c0392b;
}