:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
}

body {
    background-color: var(--light-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.card-header {
    border-radius: 10px 10px 0 0 !important;
    font-weight: 600;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), #0056b3);
}

.btn-success {
    background: linear-gradient(45deg, var(--success-color), #1e7e34);
}

.btn-danger {
    background: linear-gradient(45deg, var(--danger-color), #c82333);
}

.btn-warning {
    background: linear-gradient(45deg, var(--warning-color), #e0a800);
}

.email-item {
    background: white;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    transition: all 0.3s ease;
}

.email-item:hover {
    background: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.status-waiting {
    color: var(--warning-color);
    font-weight: 600;
}

.status-received {
    color: var(--success-color);
    font-weight: 600;
    animation: pulse 1.5s infinite;
}

.status-error {
    color: var(--danger-color);
    font-weight: 600;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.copy-btn {
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid #dee2e6;
}

.copy-btn:hover {
    transform: scale(1.05);
    background-color: #e9ecef;
}

@media (max-width: 768px) {
    .email-item .row > div {
        margin-bottom: 10px;
    }
    
    .btn {
        margin-bottom: 5px;
    }
}