:root {
    --primary-color: #2c5aa0;
    --secondary-color: #4a8df8;
    --accent-color: #1abc9c;
    --dark-color: #2c3e50;
    --light-color: #f8f9fa;
    --gray-color: #6c757d;
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  
}

body {
    background-color: #f8fafc;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

    a:hover {
        color: var(--secondary-color);
    }

.container {
    max-width: 1200px;
}

/* Breadcrumb */
.breadcrumb-container {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    padding: 1.5rem 0;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    margin-bottom: 2rem;
}

.breadcrumb {
    background: transparent;
    margin-bottom: 0;
    padding: 0;
}

.breadcrumb-item a {
    color: var(--primary-color);
}

.breadcrumb-item.active {
    color: var(--gray-color);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: ">";
    color: var(--gray-color);
}

/* Product Header */
.product-header {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.product-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.product-subtitle {
    color: var(--gray-color);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.product-badge {
    background: var(--accent-color);
    color: white;
    padding: 5px 15px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-block;
    margin-left: 10px;
}

.product-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-color);
}

    .meta-item i {
        color: var(--accent-color);
    }

/* Product Content */
.product-content-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

/* Table of Contents */
.toc-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-right: 4px solid var(--primary-color);
}

.toc-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

    .toc-title i {
        color: var(--accent-color);
    }

.toc-list {
    list-style: none;
    padding: 0;
}

.toc-item {
    margin-bottom: 12px;
    position: relative;
    padding-right: 20px;
}

    .toc-item:before {
        content: "";
        position: absolute;
        right: 0;
        top: 10px;
        width: 8px;
        height: 8px;
        background: var(--accent-color);
        border-radius: 50%;
    }

.toc-link {
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
    display: block;
    padding: 5px 0;
}

    .toc-link:hover {
        color: var(--primary-color);
        padding-right: 8px;
    }

/* Content Sections */
.content-section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

    .content-section:last-child {
        border-bottom: none;
        margin-bottom: 0;
        padding-bottom: 0;
    }

.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 10px;
}

    .section-title:after {
        content: '';
        position: absolute;
        bottom: 0;
        right: 0;
        width: 80px;
        height: 4px;
        background: var(--accent-color);
        border-radius: 2px;
    }

.content-text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--dark-color);
    margin-bottom: 1.5rem;
}

    .content-text p {
        margin-bottom: 1.2rem;
    }

.feature-list {
    list-style: none;
    margin: 1.5rem 0;
}

    .feature-list li {
        padding: 10px 0;
        border-bottom: 1px dashed #eee;
        display: flex;
        align-items: flex-start;
        gap: 12px;
    }

        .feature-list li i {
            color: var(--accent-color);
            margin-top: 5px;
        }

/* Product Gallery */
.product-gallery {
    margin: 2rem 0;
}

.gallery-img {
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1rem;
    box-shadow: var(--box-shadow);
}

    .gallery-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: var(--transition);
    }

        .gallery-img img:hover {
            transform: scale(1.05);
        }

/* Call to Action */
.cta-container {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    margin: 3rem 0;
    box-shadow: var(--box-shadow);
}

.cta-title {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.cta-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    max-width: 700px;
    margin-right: auto;
    margin-left: auto;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-light {
    background: white;
    color: var(--primary-color);
    border: none;
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
}

    .btn-light:hover {
        background: #f0f7ff;
        transform: translateY(-3px);
        box-shadow: 0 7px 15px rgba(0, 0, 0, 0.1);
        color: var(--primary-color);
    }

.btn-outline-light {
    background: transparent;
    color: white;
    border: 2px solid white;
    padding: 10px 28px;
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
}

    .btn-outline-light:hover {
        background: white;
        color: var(--primary-color);
        transform: translateY(-3px);
        box-shadow: 0 7px 15px rgba(0, 0, 0, 0.1);
    }

/* Sidebar */
.sidebar {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
    border-top: 5px solid var(--accent-color);
}

.sidebar-title {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
    color: var(--dark-color);
    font-weight: 700;
}

.info-card {
    background: #f8fafc;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    border-right: 4px solid var(--primary-color);
}

    .info-card:hover {
        background: #f0f7ff;
        transform: translateX(-5px);
    }

    .info-card h4 {
        color: var(--primary-color);
        font-size: 1.2rem;
        margin-bottom: 0.8rem;
    }

    .info-card p {
        color: var(--gray-color);
        font-size: 0.95rem;
    }

.related-products {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.related-product {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 10px;
    transition: var(--transition);
}

    .related-product:hover {
        background: #f0f7ff;
        transform: translateX(-5px);
    }

    .related-product img {
        width: 70px;
        height: 70px;
        object-fit: cover;
        border-radius: 8px;
    }

    .related-product h5 {
        font-size: 1rem;
        margin-bottom: 5px;
        color: var(--dark-color);
    }

    .related-product p {
        font-size: 0.9rem;
        color: var(--gray-color);
        margin: 0;
    }

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    left: 30px;
    background: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 5px 15px rgba(44, 90, 160, 0.3);
    transition: var(--transition);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
}

    .back-to-top.show {
        opacity: 1;
        visibility: visible;
    }

    .back-to-top:hover {
        background: var(--secondary-color);
        transform: translateY(-5px);
    }

/* Responsive Design */
@media (max-width: 992px) {
    .product-title {
        font-size: 1.8rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .cta-container {
        padding: 2rem 1.5rem;
    }

    .cta-title {
        font-size: 1.6rem;
    }
}

@media (max-width: 768px) {
    .product-header, .product-content-container, .sidebar {
        padding: 1.5rem;
    }

    .product-title {
        font-size: 1.6rem;
    }

    .toc-container {
        padding: 1.2rem;
    }

    .content-section {
        margin-bottom: 2rem;
        padding-bottom: 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

        .cta-buttons .btn {
            width: 100%;
            max-width: 300px;
        }

    .back-to-top {
        bottom: 20px;
        left: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
}

@media (max-width: 576px) {
    .product-title {
        font-size: 1.4rem;
    }

    .product-meta {
        flex-direction: column;
        gap: 1rem;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .content-text {
        font-size: 1rem;
    }
}