#ptvec-demo {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.ptvec-title {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.5em;
}

.ptvec-channels {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.ptvec-channel-card {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #fff;
}

.ptvec-channel-card:hover {
    border-color: #4CAF50;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.2);
}

.ptvec-channel-card.active {
    border-color: #4CAF50;
    box-shadow: 0 2px 12px rgba(76, 175, 80, 0.3);
    background: #f1f8e9;
}

.ptvec-channel-name {
    font-weight: 700;
    font-size: 1.1em;
    color: #333;
}

.ptvec-products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.ptvec-product-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.ptvec-product-img {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 12px;
}

.ptvec-product-name {
    font-size: 1em;
    font-weight: 600;
    margin: 0 0 8px;
}

.ptvec-product-price {
    color: #e53935;
    font-size: 1.1em;
    font-weight: 700;
    margin: 0 0 12px;
}

.ptvec-add-to-cart {
    display: inline-block;
    padding: 8px 20px;
    background: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95em;
    transition: background 0.2s;
}

.ptvec-add-to-cart:hover {
    background: #388E3C;
}

.ptvec-add-to-cart:disabled {
    background: #bdbdbd;
    cursor: not-allowed;
}

.ptvec-cart-actions {
    text-align: center;
    margin: 24px 0;
}

.ptvec-btn-checkout {
    display: inline-block;
    padding: 12px 32px;
    background: #1565C0;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    transition: background 0.2s;
}

.ptvec-btn-checkout:hover {
    background: #0D47A1;
    color: #fff;
}

.ptvec-notice {
    text-align: center;
    padding: 10px;
    border-radius: 6px;
    margin-top: 12px;
    font-weight: 500;
}

.ptvec-notice.success {
    background: #e8f5e9;
    color: #2e7d32;
}

.ptvec-notice.error {
    background: #ffebee;
    color: #c62828;
}

.ptvec-no-products {
    grid-column: 1 / -1;
    text-align: center;
    color: #757575;
    padding: 40px;
}

.ptvec-loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: #757575;
}

@media (max-width: 768px) {
    .ptvec-channels {
        grid-template-columns: repeat(2, 1fr);
    }

    .ptvec-products {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .ptvec-products {
        grid-template-columns: 1fr;
    }
}