:root {
    --primary-color: #25D366;
    --secondary-color: #128C7E;
    --accent-color: #34B7F1;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.min-vh-100 {
    min-height: 100vh;
}

.card {
    border: none;
    border-radius: 15px;
}

.card-header {
    border-radius: 15px 15px 0 0 !important;
}

.btn {
    border-radius: 8px;
    font-weight: 500;
}

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

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

.navbar-brand {
    font-weight: bold;
}

.feature-card {
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.border-left-primary {
    border-left: 4px solid var(--primary-color) !important;
}

.border-left-success {
    border-left: 4px solid #28a745 !important;
}

.border-left-info {
    border-left: 4px solid #17a2b8 !important;
}

.border-left-warning {
    border-left: 4px solid #ffc107 !important;
}

.table th {
    border-top: none;
    font-weight: 600;
    color: #6c757d;
}

.alert {
    border-radius: 10px;
    border: none;
}

/* QR Code Styles */
.qr-container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.qr-image {
    max-width: 300px;
    height: auto;
}

/* File Upload Styles */
.file-upload-area {
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.file-upload-area:hover {
    border-color: var(--primary-color);
    background: #e8f5e8;
}

.file-upload-area.dragover {
    border-color: var(--primary-color);
    background: #d4edda;
}

/* Message Preview */
.message-preview {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 15px;
    border-left: 4px solid var(--primary-color);
}

/* Status Badges */
.status-connected {
    background-color: #28a745;
    color: white;
}

.status-disconnected {
    background-color: #dc3545;
    color: white;
}

.status-pending {
    background-color: #ffc107;
    color: black;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
    
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}