```css
/* =========================================================
   PRODUCT CATALOG
   Modern Minimal Blue Theme
   ASP.NET Core MVC 9
   ========================================================= */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary: #0f172a;
    --text: #1e293b;
    --text-light: #64748b;
    --background: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
    --success: #16a34a;
    --danger: #dc2626;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
    --radius-sm: 10px;
    --radius: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s ease;
}


/* =========================================================
   GLOBAL
   ========================================================= */

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
    color: var(--text);
    background: var(--background);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

::selection {
    background: var(--primary);
    color: white;
}


/* =========================================================
   TOP LANGUAGE BAR
   ========================================================= */

.top-language-bar {
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

    .top-language-bar .container {
        display: flex;
        justify-content: flex-end;
    }

.language-selector {
    display: flex;
    align-items: center;
    gap: 4px;
    min-height: 38px;
}

.language-title {
    color: var(--text-light);
    margin-left: 8px;
    margin-right: 8px;
}

    .language-title i {
        color: var(--primary);
        margin-inline-end: 5px;
    }

.language-selector a {
    color: var(--text-light);
    padding: 3px 10px;
    border-radius: 7px;
    transition: var(--transition);
}

    .language-selector a:hover {
        color: var(--primary);
        background: var(--primary-light);
    }

    .language-selector a.active {
        color: white;
        background: var(--primary);
    }


/* =========================================================
   NAVBAR
   ========================================================= */

.navbar {
    min-height: 76px;
    border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    color: var(--secondary) !important;
    font-size: 21px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

    .navbar-brand i {
        color: var(--primary);
        margin-inline-end: 7px;
    }

.navbar-nav {
    gap: 4px;
}

.nav-link {
    position: relative;
    color: #475569 !important;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 13px !important;
    border-radius: 9px;
    transition: var(--transition);
}

    .nav-link i {
        margin-inline-end: 5px;
    }

    .nav-link:hover {
        color: var(--primary) !important;
        background: var(--primary-light);
    }

.navbar-toggler {
    border: 1px solid var(--border);
    border-radius: 10px;
}

    .navbar-toggler:focus {
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }


/* =========================================================
   MAIN
   ========================================================= */

main {
    min-height: 500px;
}


/* =========================================================
   HERO
   ========================================================= */

.hero-section {
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient( 135deg, #eff6ff 0%, #ffffff 50%, #f8fafc 100% );
}

    .hero-section::before {
        content: "";
        position: absolute;
        width: 500px;
        height: 500px;
        border-radius: 50%;
        background: rgba(37, 99, 235, 0.08);
        top: -220px;
        left: -180px;
    }

    .hero-section::after {
        content: "";
        position: absolute;
        width: 420px;
        height: 420px;
        border-radius: 50%;
        background: rgba(59, 130, 246, 0.06);
        bottom: -230px;
        right: -150px;
    }

.hero-content {
    position: relative;
    z-index: 2;
    padding: 80px 0;
}

    .hero-content h1 {
        color: var(--secondary);
        font-size: clamp(36px, 5vw, 62px);
        font-weight: 800;
        line-height: 1.25;
        letter-spacing: -1.5px;
        margin-bottom: 22px;
    }

        .hero-content h1 span {
            color: var(--primary);
        }

    .hero-content p {
        max-width: 650px;
        color: var(--text-light);
        font-size: 17px;
        margin-bottom: 32px;
    }

.hero-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}


/* =========================================================
   BUTTONS
   ========================================================= */

.btn-primary-custom {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 10px 24px;
    color: white !important;
    background: var(--primary);
    border: none;
    border-radius: 11px;
    font-weight: 600;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
    transition: var(--transition);
}

    .btn-primary-custom:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 12px 28px rgba(37, 99, 235, 0.28);
    }

.btn-outline-custom {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 10px 24px;
    color: var(--primary) !important;
    background: white;
    border: 1px solid #bfdbfe;
    border-radius: 11px;
    font-weight: 600;
    transition: var(--transition);
}

    .btn-outline-custom:hover {
        background: var(--primary-light);
        border-color: var(--primary);
        transform: translateY(-2px);
    }


/* =========================================================
   HERO IMAGE
   ========================================================= */

.hero-image-wrapper {
    position: relative;
    z-index: 2;
    padding: 30px;
}

.hero-image {
    width: 100%;
    max-height: 470px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.hero-image-placeholder {
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #93c5fd;
    background: white;
    border: 1px dashed #bfdbfe;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

    .hero-image-placeholder i {
        font-size: 80px;
    }


/* =========================================================
   SECTION
   ========================================================= */

.section {
    padding: 90px 0;
}

.section-light {
    background: white;
}

.section-header {
    max-width: 720px;
    margin: 0 auto 45px;
    text-align: center;
}

    .section-header .section-label {
        display: inline-block;
        color: var(--primary);
        background: var(--primary-light);
        border-radius: 50px;
        padding: 5px 14px;
        font-size: 12px;
        font-weight: 700;
        margin-bottom: 12px;
    }

    .section-header h2 {
        color: var(--secondary);
        font-size: clamp(28px, 4vw, 38px);
        font-weight: 750;
        margin-bottom: 12px;
    }

    .section-header p {
        color: var(--text-light);
        margin: 0;
    }


/* =========================================================
   CATEGORY SECTION
   ========================================================= */

.categories-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
}

.category-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: 20px 16px;
    color: var(--text);
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

    .category-btn:hover {
        color: var(--primary);
        border-color: #bfdbfe;
        transform: translateY(-5px);
        box-shadow: var(--shadow);
    }

    .category-btn.active {
        color: white;
        background: linear-gradient( 135deg, var(--primary), #3b82f6 );
        border-color: var(--primary);
        box-shadow: 0 12px 28px rgba(37, 99, 235, 0.25);
    }

    .category-btn img {
        width: 76px;
        height: 76px;
        object-fit: cover;
        border-radius: 50%;
        margin-bottom: 12px;
        border: 4px solid #eff6ff;
        transition: var(--transition);
    }

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

    .category-btn.active img {
        border-color: rgba(255,255,255,0.4);
    }

    .category-btn i {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 76px;
        height: 76px;
        margin-bottom: 12px;
        color: var(--primary);
        background: var(--primary-light);
        border-radius: 50%;
        font-size: 30px;
    }

    .category-btn.active i {
        color: white;
        background: rgba(255,255,255,0.15);
    }

    .category-btn span {
        font-size: 15px;
        font-weight: 650;
    }


/* =========================================================
   CATEGORY ALL BUTTON
   ========================================================= */

.category-all-btn {
    color: white;
    background: var(--secondary);
    border-color: var(--secondary);
}

    .category-all-btn:hover {
        color: white;
        background: #1e293b;
        border-color: #1e293b;
    }


/* =========================================================
   PRODUCTS
   ========================================================= */

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
}

.product-card {
    overflow: hidden;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

    .product-card:hover {
        transform: translateY(-7px);
        border-color: #dbeafe;
        box-shadow: var(--shadow);
    }

.product-image-wrapper {
    position: relative;
    height: 245px;
    overflow: hidden;
    background: #f1f5f9;
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .product-image {
    transform: scale(1.06);
}

.product-image-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
}

    .product-image-placeholder i {
        font-size: 60px;
    }

.product-body {
    padding: 20px;
}

.product-category {
    display: inline-block;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 50px;
    padding: 3px 10px;
    margin-bottom: 9px;
    font-size: 11px;
    font-weight: 700;
}

.product-title {
    color: var(--secondary);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-description {
    display: -webkit-box;
    overflow: hidden;
    color: var(--text-light);
    font-size: 13px;
    line-height: 1.8;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    margin-bottom: 18px;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    transition: var(--transition);
}

    .product-link:hover {
        color: var(--primary-dark);
        gap: 10px;
    }


/* =========================================================
   ABOUT
   ========================================================= */

.about-section {
    background: white;
}

.about-image {
    width: 100%;
    height: 100%;
    min-height: 350px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.about-content {
    padding: 20px;
}

    .about-content h2 {
        color: var(--secondary);
        font-size: 36px;
        font-weight: 750;
        margin-bottom: 18px;
    }

    .about-content p {
        color: var(--text-light);
        font-size: 15px;
        margin-bottom: 15px;
    }


/* =========================================================
   NEWS
   ========================================================= */

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.news-card {
    overflow: hidden;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

    .news-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow);
    }

.news-image-wrapper {
    height: 210px;
    overflow: hidden;
    background: #f1f5f9;
}

.news-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-card:hover .news-image {
    transform: scale(1.05);
}

.news-body {
    padding: 20px;
}

.news-date {
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 7px;
}

.news-title {
    color: var(--secondary);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.news-description {
    color: var(--text-light);
    font-size: 13px;
    display: -webkit-box;
    overflow: hidden;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}


/* =========================================================
   GALLERY
   ========================================================= */

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.gallery-item {
    position: relative;
    height: 230px;
    overflow: hidden;
    border-radius: var(--radius);
    background: #e2e8f0;
    cursor: pointer;
}

    .gallery-item img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
    }

    .gallery-item::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient( to top, rgba(15,23,42,0.45), transparent 50% );
        opacity: 0;
        transition: var(--transition);
    }

    .gallery-item:hover img {
        transform: scale(1.08);
    }

    .gallery-item:hover::after {
        opacity: 1;
    }


/* =========================================================
   CONTACT
   ========================================================= */

.contact-section {
    background: linear-gradient( 135deg, #eff6ff, #ffffff );
}

.contact-card {
    height: 100%;
    padding: 30px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 22px;
}

.contact-icon {
    flex-shrink: 0;
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 12px;
    font-size: 20px;
}

.contact-item h6 {
    color: var(--secondary);
    margin: 0 0 2px;
    font-weight: 700;
}

.contact-item p {
    color: var(--text-light);
    margin: 0;
    font-size: 14px;
}


/* =========================================================
   FOOTER
   ========================================================= */

.site-footer {
    color: #cbd5e1;
    background: #0f172a;
    padding: 65px 0 25px;
}

    .site-footer h5 {
        color: white;
        font-size: 17px;
        font-weight: 700;
        margin-bottom: 18px;
    }

        .site-footer h5 i {
            color: #60a5fa;
            margin-inline-end: 6px;
        }

    .site-footer p {
        color: #94a3b8;
        font-size: 14px;
        max-width: 400px;
    }

.footer-links,
.footer-contact {
    padding: 0;
    margin: 0;
    list-style: none;
}

    .footer-links li,
    .footer-contact li {
        margin-bottom: 9px;
    }

    .footer-links a {
        color: #94a3b8;
        font-size: 14px;
        transition: var(--transition);
    }

        .footer-links a:hover {
            color: #60a5fa;
            padding-inline-start: 4px;
        }

    .footer-contact li {
        color: #94a3b8;
        font-size: 14px;
    }

    .footer-contact i {
        color: #60a5fa;
        margin-inline-end: 8px;
    }

.site-footer hr {
    margin: 35px 0 20px;
    border-color: rgba(255,255,255,0.08);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    color: #64748b;
    font-size: 12px;
}


/* =========================================================
   EMPTY STATE
   ========================================================= */

.empty-state {
    padding: 70px 20px;
    text-align: center;
    color: var(--text-light);
    background: white;
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

    .empty-state i {
        display: block;
        color: #cbd5e1;
        font-size: 55px;
        margin-bottom: 15px;
    }

    .empty-state h4 {
        color: var(--secondary);
        font-size: 20px;
    }


/* =========================================================
   DETAILS PAGE
   ========================================================= */

.details-image {
    width: 100%;
    max-height: 550px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.details-content {
    padding: 15px;
}

    .details-content h1 {
        color: var(--secondary);
        font-size: clamp(28px, 4vw, 42px);
        font-weight: 750;
        line-height: 1.4;
        margin-bottom: 18px;
    }

    .details-content p {
        color: var(--text-light);
        line-height: 2;
    }


/* =========================================================
   PRODUCT GALLERY
   ========================================================= */

.product-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 15px;
}

    .product-gallery img {
        width: 100%;
        height: 100px;
        object-fit: cover;
        border-radius: 10px;
        cursor: pointer;
        border: 2px solid transparent;
        transition: var(--transition);
    }

        .product-gallery img:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
        }


/* =========================================================
   SCROLL ANIMATION
   ========================================================= */

.fade-up {
    animation: fadeUp 0.7s ease both;
}

@keyframes fadeUp {

    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 991.98px) {

    .navbar-nav {
        padding-top: 12px;
    }

    .nav-link {
        padding: 9px 12px !important;
    }

    .hero-section {
        min-height: auto;
    }

    .hero-content {
        padding: 70px 0 30px;
    }

    .hero-image-wrapper {
        padding: 20px 0 60px;
    }

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


@media (max-width: 767.98px) {

    .section {
        padding: 65px 0;
    }

    .hero-content h1 {
        font-size: 38px;
    }

    .hero-content p {
        font-size: 15px;
    }

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

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .product-image-wrapper {
        height: 190px;
    }

    .product-body {
        padding: 15px;
    }

    .product-title {
        font-size: 16px;
    }

    .news-grid {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .gallery-item {
        height: 180px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}


@media (max-width: 480px) {

    .top-language-bar .container {
        justify-content: center;
    }

    .language-selector {
        font-size: 12px;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-primary-custom,
    .btn-outline-custom {
        width: 100%;
    }

    .categories-wrapper {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .category-btn {
        padding: 15px 8px;
    }

        .category-btn img,
        .category-btn i {
            width: 60px;
            height: 60px;
        }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .product-image-wrapper {
        height: 230px;
    }

    .gallery-grid {
        grid-template-columns: 1fr 1fr;
    }
}


/* =========================================================
   RTL
   ========================================================= */

[dir="rtl"] .hero-content {
    text-align: right;
}

[dir="rtl"] .product-link i {
    transform: rotate(180deg);
}

[dir="rtl"] .footer-links a:hover {
    padding-inline-start: 0;
    padding-inline-end: 4px;
}


/* =========================================================
   LTR
   ========================================================= */

[dir="ltr"] .hero-content {
    text-align: left;
}


/* =========================================================
   ACCESSIBILITY / FOCUS
   ========================================================= */

a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.25);
    outline-offset: 3px;
}


/* =========================================================
   REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

```