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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    color: #ff6b35;
    font-size: 1.8rem;
    font-weight: bold;
}

.logo p {
    font-size: 0.9rem;
    color: #ccc;
    margin-top: -5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #ff6b35;
}

main {
    margin-top: 80px;
}

.section {
    padding: 4rem 0;
}

.section:nth-child(even) {
    background-color: white;
}

.hero {
    background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    color: white;
    text-align: center;
    padding: 6rem 0;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.quick-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    background-color: rgba(255,255,255,0.2);
    color: white;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn:hover {
    background-color: white;
    color: #ff6b35;
    border-color: white;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
    text-align: center;
}

h3 {
    color: #ff6b35;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.supplier-categories {
    display: grid;
    gap: 3rem;
    margin-top: 3rem;
}

.category h3 {
    border-bottom: 3px solid #ff6b35;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.suppliers-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.supplier-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.supplier-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
}

.supplier-card h4 {
    color: #333;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.contact {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.article-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    position: relative;
}

.article-card:hover {
    transform: translateY(-3px);
}

.article-card h3 {
    color: #333;
    margin-bottom: 1rem;
}

.category-tag {
    background-color: #ff6b35;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.specs-container {
    margin-top: 2rem;
}

.year-selector {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.year-btn {
    background-color: #f0f0f0;
    border: 2px solid #ddd;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.year-btn.active,
.year-btn:hover {
    background-color: #ff6b35;
    color: white;
    border-color: #ff6b35;
}

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

.spec-group {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.spec-group ul {
    list-style: none;
}

.spec-group li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

.spec-group li:last-child {
    border-bottom: none;
}

.maintenance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.maintenance-category {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.maintenance-category ul {
    list-style: none;
    margin-top: 1rem;
}

.maintenance-category li {
    padding: 0.5rem 0;
    padding-left: 1rem;
    position: relative;
}

.maintenance-category li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #ff6b35;
    font-weight: bold;
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 2rem;
}

.parts-navigation {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.parts-nav-btn {
    background-color: #f0f0f0;
    border: 2px solid #ddd;
    padding: 12px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.parts-nav-btn.active,
.parts-nav-btn:hover {
    background-color: #ff6b35;
    color: white;
    border-color: #ff6b35;
}

.parts-content {
    margin-top: 2rem;
}

.parts-category {
    display: none;
    margin-bottom: 3rem;
}

.parts-category.active {
    display: block;
}

.parts-subcategory {
    margin-bottom: 3rem;
}

.parts-subcategory h4 {
    color: #333;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #f0f0f0;
}

.parts-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.parts-table th,
.parts-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.parts-table th {
    background-color: #ff6b35;
    color: white;
    font-weight: bold;
}

.parts-table tr:hover {
    background-color: #f8f9fa;
}

.parts-table a {
    color: #ff6b35;
    text-decoration: none;
    font-weight: 500;
}

.parts-table a:hover {
    text-decoration: underline;
}

footer {
    background-color: #1a1a1a;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: #ff6b35;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    padding: 0.3rem 0;
}

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ff6b35;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    text-align: center;
    color: #999;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .quick-links {
        flex-direction: column;
        align-items: center;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .suppliers-list,
    .articles-grid,
    .specs-content,
    .maintenance-grid {
        grid-template-columns: 1fr;
    }
    
    .year-selector {
        flex-direction: column;
        align-items: center;
    }
    
    .parts-table {
        font-size: 0.9rem;
    }
    
    .parts-table th,
    .parts-table td {
        padding: 0.7rem;
    }
    
    .parts-navigation {
        gap: 0.3rem;
    }
    
    .parts-nav-btn {
        padding: 10px 15px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 4rem 0;
    }
    
    .section {
        padding: 2rem 0;
    }
    
    .supplier-card,
    .article-card,
    .spec-group,
    .maintenance-category {
        padding: 1rem;
    }
}

html {
    scroll-behavior: smooth;
}