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

:root {
    --primary-white: #FFFFFF;
    --secondary-gray: #F5F5F7;
    --tertiary-gray: #EDEDED;
    --text-dark: #1D1D1F;
    --text-medium: #86868B;
    --brand-red: #D0021B;
    --border-radius: 16px;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Noto Sans SC', sans-serif;
    background-color: var(--primary-white);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    text-align: left;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    letter-spacing: -0.02em;
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
    font-weight: 700;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 600;
}

p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    text-align: left;
}

.text-center {
    text-align: center !important;
}

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

a:hover {
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--tertiary-gray);
    z-index: 1000;
    transition: var(--transition);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
}

.brand-red {
    color: var(--brand-red);
    margin-left: 0.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
}

.nav-links a:hover {
    text-decoration: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--text-dark);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active::after {
    width: 100%;
}

.dropdown {
    position: relative;
}

.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--primary-white);
    min-width: 200px;
    box-shadow: var(--shadow-light);
    border-radius: var(--border-radius);
    padding: 1rem 0;
    margin-top: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-content a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

.dropdown-content a:hover {
    background-color: var(--secondary-gray);
    text-decoration: none;
}

.language-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-switch button {
    background: none;
    border: none;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.language-switch button:hover {
    background-color: var(--secondary-gray);
}

.language-switch button.active {
    font-weight: 600;
    color: var(--brand-red);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: 9999px;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--text-dark);
    color: var(--primary-white);
}

.btn-primary:hover {
    background-color: #333;
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--secondary-gray);
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: #E0E0E0;
    text-decoration: none;
}

.btn-tertiary {
    background-color: transparent;
    color: var(--brand-red);
    border: 2px solid var(--brand-red);
    box-shadow: none;
}

.btn-tertiary:hover {
    background-color: var(--brand-red);
    color: var(--primary-white);
    text-decoration: none;
}

.btn-learn-more {
    background-color: var(--brand-red);
    color: var(--primary-white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    padding: 0.75rem 1.5rem;
    align-self: flex-start;
    margin-top: auto;
}

.btn-learn-more:hover {
    background-color: #B30017;
    text-decoration: none;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: left;
    position: relative;
    overflow: hidden;
    background-color: var(--primary-white);
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: 
        linear-gradient(135deg, rgba(208, 2, 27, 0.05) 0%, rgba(29, 29, 31, 0.05) 100%),
        radial-gradient(circle at 80% 50%, rgba(208, 2, 27, 0.1) 0%, transparent 50%),
        repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(29, 29, 31, 0.02) 10px, rgba(29, 29, 31, 0.02) 20px),
        repeating-linear-gradient(-45deg, transparent, transparent 10px, rgba(208, 2, 27, 0.02) 10px, rgba(208, 2, 27, 0.02) 20px);
    z-index: 0;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    margin-bottom: 1.5rem;
    line-height: 1.1;
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    letter-spacing: -0.02em;
}

.hero p {
    margin-bottom: 2.5rem;
    font-size: 1.125rem;
    color: var(--text-medium);
    line-height: 1.6;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    justify-content: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    background-color: rgba(245, 245, 247, 0.5);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.hero-image img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.hero-image img:hover {
    transform: scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
    .hero {
        padding: 4rem 0;
        text-align: center;
    }
    
    .hero-bg {
        width: 100%;
        height: 50%;
        top: 0;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero-content {
        max-width: 100%;
        text-align: center;
    }
    
    .hero h1 {
        font-size: clamp(2rem, 5vw, 3rem);
    }
    
    .hero p {
        font-size: 1rem;
        max-width: 100%;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .hero-image {
        margin-top: 2rem;
        padding: 1.5rem;
    }
    
    .hero-image img {
        max-height: 300px;
    }
}

/* Products Section */
.products-section {
    padding: 4rem 0;
    background-color: var(--primary-white);
}

.products-container {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

/* Left Sidebar */
.products-sidebar {
    width: 220px;
    flex-shrink: 0;
}

.category-nav {
    background-color: #f5f5f5;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.category-item {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #e0e0e0;
    font-size: 14px;
}

.category-item:last-child {
    border-bottom: none;
}

.category-item:hover {
    background-color: #e8e8e8;
}

.category-item.active {
    background-color: var(--brand-red);
    color: var(--primary-white);
}

.category-name {
    font-weight: 500;
    flex: 1;
}

.toggle-icon {
    font-size: 12px;
    transition: var(--transition);
    width: 16px;
    text-align: right;
}

.category-item.active .toggle-icon {
    transform: rotate(45deg);
}

.subcategories {
    background-color: #ffffff;
    padding: 0;
    display: none;
}

.category-item.active .subcategories {
    display: block;
}

.subcategory-item {
    padding: 0.5rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 12px;
    color: #333333;
    border-bottom: 1px solid #f0f0f0;
}

.subcategory-item:last-child {
    border-bottom: none;
}

.subcategory-item:hover {
    background-color: #f8f8f8;
    color: #000000;
}

.subcategory-item.active {
    color: var(--brand-red);
    font-weight: 500;
    background-color: #f8f8f8;
}

/* Right Side: Product Display */
.products-display {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.product-card {
    background-color: var(--primary-white);
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card:hover {
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

.product-card-image {
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #fafafa;
    height: 200px;
}

.product-card-image img {
    max-width: 100%;
    max-height: 180px;
    object-fit: contain;
    transition: all 0.3s ease;
}

.product-card-image img:hover {
    transform: scale(1.05);
    transition: all 0.3s ease;
}

.product-card-content {
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-card-content h3 {
    margin-bottom: 0.75rem;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.2;
    color: #333333;
}

.product-tags {
    display: flex;
    gap: 4px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.tag {
    background-color: #f0f0f0;
    color: #666666;
    padding: 2px 8px;
    border-radius: 2px;
    font-size: 12px;
    font-weight: 400;
}

.product-card-content .btn-learn-more {
    margin-top: auto;
    background-color: transparent;
    color: #666666;
    border: 1px solid #666666;
    font-size: 12px;
    padding: 6px 12px;
    height: 28px;
    line-height: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 2px;
    box-shadow: none;
}

.product-card-content .btn-learn-more:hover {
    background-color: var(--brand-red);
    color: var(--primary-white);
    border-color: var(--brand-red);
    transform: none;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .products-container {
        flex-direction: column;
    }
    
    .products-sidebar {
        width: 100%;
    }
    
    .products-display {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .products-display {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-item {
        padding: 0.6rem 0.8rem;
    }
    
    .subcategory-item {
        padding: 0.4rem 1.2rem;
    }
    
    .product-card-image {
        height: 180px;
    }
}

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

/* About Section */
.about-section {
    padding: 8rem 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--secondary-gray);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-light);
}

.stat-item h4 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-item p {
    font-size: 1rem;
    color: var(--text-medium);
    margin-bottom: 0;
}

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    background-color: var(--secondary-gray);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    margin-bottom: 1.5rem;
}

.cta-content p {
    margin-bottom: 2rem;
    color: var(--text-medium);
}

/* Product Pages */
.product-hero {
    padding: 6rem 0;
    text-align: center;
}

.product-hero h1 {
    margin-bottom: 1rem;
}

.product-hero p {
    margin-bottom: 3rem;
    color: var(--text-medium);
}

.product-features {
    padding: 6rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-item {
    padding: 2rem;
    background-color: var(--secondary-gray);
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-light);
}

.feature-item h3 {
    margin-bottom: 1rem;
}

.feature-item p {
    color: var(--text-medium);
    margin-bottom: 0;
}

.product-models {
    padding: 6rem 0;
    background-color: var(--secondary-gray);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.model-card {
    background-color: var(--primary-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.model-image {
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.model-image img {
    max-width: 100%;
    height: auto;
    max-height: 200px;
}

.model-content {
    padding: 2rem;
}

.model-content h3 {
    margin-bottom: 1rem;
}

.model-content p {
    margin-bottom: 1.5rem;
    color: var(--text-medium);
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
}

.specs-table th {
    background-color: var(--secondary-gray);
    padding: 1rem;
    text-align: left;
    font-weight: 500;
    border-bottom: 1px solid var(--tertiary-gray);
}

.specs-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--tertiary-gray);
}

.specs-table tr:last-child td {
    border-bottom: none;
}

/* Comparison Table */
.comparison-section {
    padding: 6rem 0;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 4rem;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.comparison-table th {
    background-color: var(--secondary-gray);
    padding: 1.5rem;
    text-align: left;
    font-weight: 500;
    border-bottom: 1px solid var(--tertiary-gray);
}

.comparison-table td {
    padding: 1.5rem;
    border-bottom: 1px solid var(--tertiary-gray);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover {
    background-color: var(--secondary-gray);
}

/* Contact Page */
.contact-section {
    padding: 8rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info {
    background-color: var(--secondary-gray);
    padding: 3rem;
    border-radius: var(--border-radius);
}

.contact-info h2 {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-item i {
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.contact-item p {
    margin-bottom: 0;
}

.contact-form {
    background-color: var(--primary-white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--tertiary-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--text-dark);
    box-shadow: 0 0 0 3px rgba(29, 29, 31, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.form-group .error {
    color: var(--brand-red);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.success-message {
    background-color: #E8F5E8;
    color: #2E7D32;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    text-align: center;
    display: none;
}

/* Footer */
footer {
    background-color: var(--text-dark);
    padding: 5rem 0 2rem;
    color: var(--primary-white);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 4rem;
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    color: var(--primary-white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-white);
    text-decoration: none;
}

.footer-section .logo {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.footer-section .logo .brand-red {
    color: var(--brand-red);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    margin-bottom: 0;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-white);
    text-decoration: none;
}

/* Image Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.modal-content {
    max-width: 90%;
    max-height: 90%;
}

.modal-content img {
    max-width: 100%;
    max-height: 100%;
    border-radius: 8px;
}

.close-modal {
    position: absolute;
    top: 2rem;
    right: 2rem;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--primary-white);
    cursor: pointer;
    padding: 0.5rem;
}

.prev-btn, .next-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--primary-white);
    cursor: pointer;
    padding: 1rem;
    transition: var(--transition);
}

.prev-btn:hover, .next-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.prev-btn {
    left: 2rem;
}

.next-btn {
    right: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        padding: 1rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--primary-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
        box-shadow: var(--shadow-light);
        border-bottom: 1px solid var(--tertiary-gray);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 0.75rem 0;
    }

    .dropdown-content {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0 0 0 1.5rem;
        margin-top: 0.5rem;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero {
        padding: 6rem 0;
    }

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

    .btn {
        width: 100%;
        max-width: 250px;
    }

    .products-section,
    .about-section,
    .cta-section,
    .product-hero,
    .product-features,
    .product-models,
    .comparison-section,
    .contact-section {
        padding: 6rem 0;
    }

    .products-grid,
    .about-stats,
    .features-grid,
    .models-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-info,
    .contact-form {
        padding: 2rem;
    }

    .footer-content {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }

    .products-section,
    .about-section,
    .cta-section,
    .product-hero,
    .product-features,
    .product-models,
    .comparison-section,
    .contact-section {
        padding: 4rem 0;
    }

    .contact-info,
    .contact-form {
        padding: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mt-3 {
    margin-top: 1.5rem;
}

.mt-4 {
    margin-top: 2rem;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

/* SVG Icons */
.icon {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--text-medium);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-dark);
}

/* Focus Styles */
*:focus {
    outline: 2px solid var(--brand-red);
    outline-offset: 2px;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--text-dark);
    color: var(--primary-white);
    border: none;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: #333;
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* Print Styles */
@media print {
    header,
    footer {
        display: none;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .btn {
        display: none;
    }
    
    .back-to-top {
        display: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-white: #FFFFFF;
        --secondary-gray: #CCCCCC;
        --tertiary-gray: #999999;
        --text-dark: #000000;
        --text-medium: #333333;
    }

    .product-card,
    .stat-item,
    .feature-item,
    .model-card {
        box-shadow: 0 0 0 1px var(--text-dark);
    }
}

/* Reduce Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}