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

.container {
    max-width: 1200px;
}

.card {
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 1px solid #0d6efd;
    margin-bottom: 20px;
}

.btn {
    border-radius: 6px;
    padding: 12px 24px;
    font-weight: 500;
}

.btn-primary, .btn-success {
    font-size: 1.1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.btn-primary:hover, .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

#deviceDetails, #newDeviceDetails {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
}

select.form-control, input.form-control {
    padding: 10px;
    margin-bottom: 15px;
}

/* Plan Card Styles */
.plan-card {
    cursor: pointer;
    transition: all 0.3s ease;
    height: 100%;
    padding: 15px;
    display: flex;
    flex-direction: column;
}

.plan-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.plan-card.selected {
    border: 3px solid #0d6efd;
    background-color: #f0f7ff;
}

.card-title {
    font-size: 24px;
    margin-bottom: 15px;
}

.price-button {
    font-size: 18px;
    font-weight: bold;
    padding: 10px 0;
    margin: 15px 0;
}

.select-plan-btn {
    margin-top: auto;
    font-weight: bold;
    padding: 10px;
    border: 2px solid #0d6efd;
    transition: all 0.2s;
}

.select-plan-btn:hover {
    background-color: #0d6efd;
    color: white;
}

.row-cols-1 {
    margin: 0 -10px;
}

.col {
    padding: 0 10px;
}

/* WhatsApp Preview Styles */
.whatsapp-preview {
    background-color: #e5ddd5;
    border-radius: 8px;
    overflow: hidden;
}

.whatsapp-header {
    background-color: #128C7E;
    color: white;
    padding: 12px 15px;
    display: flex;
    align-items: center;
}

.recipient-info {
    flex: 1;
}

.whatsapp-content {
    padding: 15px;
    background-color: #e5ddd5;
    min-height: 200px;
    max-height: 400px;
    overflow-y: auto;
}

.message-preview {
    font-family: 'Segoe UI', sans-serif;
    white-space: pre-wrap;
    background-color: white;
    border-radius: 8px;
    padding: 10px 15px;
    margin: 0;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    position: relative;
}

.message-preview::after {
    content: '';
    position: absolute;
    top: 0;
    left: -10px;
    border-width: 0 10px 10px 0;
    border-style: solid;
    border-color: transparent white transparent transparent;
}

@media (min-width: 768px) {
    .row-cols-md-3 > .col {
        flex: 0 0 33.333333%;
        max-width: 33.333333%;
    }
}

@media (min-width: 992px) {
    .row-cols-lg-4 > .col {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

@media (max-width: 767px) {
    .card-body {
        padding: 15px;
    }
}

.main-container {
    max-width: 800px;
    margin: 0 auto;
}

.logo-container {
    display: flex;
    justify-content: center;
    margin: 15px 0;
}

.logo {
    max-height: 80px;
    max-width: 100%;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.user-guidance {
    background-color: #e8f4f8;
    border-left: 4px solid #007bff;
    padding: 12px;
    margin: 20px 0;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.user-guidance p {
    color: #212529;
    font-size: 1.1rem;
}

.user-guidance strong {
    color: #007bff;
}