:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-gray: #f5f6fa;
    --dark-gray: #2c3e50;
    --white: #ffffff;
}

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

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

a:hover {
    text-decoration: none;
    color: var(--secondary-color);
}

body {
    font-family: 'Yu Gothic', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
}

/* Header Styles */
.navbar {
    position: fixed;
    width: 100%;
    background: var(--white);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 1000;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-gray);
    margin: 0 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    height: 80vh;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://via.placeholder.com/1920x1080/007bff/ffffff?text=Business+Air+Conditioner');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
}

.hero-content {
    padding: 2rem;
    max-width: 800px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}



/* Installer Comparison */
.installer-comparison {
    padding: 5rem 10%;
    background: var(--white);
}

.installer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.installer-card {
    background: var(--white);
    border-radius: 0;
    overflow: hidden;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    gap: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.installer-card:hover {
    transform: translateY(-5px);
}

.installer-card img {
    width: 390px;
    height: 200px;
    object-fit: contain;
}

.installer-info {
    text-align: center;
    width: 100%;
    padding: 0 2rem;
}

.installer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.strengths {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.strengths span {
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

.features {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
}

.feature i {
    font-size: 1.2rem;
}

.comparison-points {
    margin-bottom: 1.5rem;
}

.comparison-points h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.comparison-points ul {
    list-style: none;
    padding: 0;
}

.comparison-points li {
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

/* Manufacturer Comparison */
.comparison {
    padding: 5rem 10%;
    background: var(--light-gray);
}

.manufacturer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.manufacturer-card {
    border-radius: 0;
    overflow: hidden;
}

.manufacturer-card img {
    border-radius: 0;
}

.manufacturer-info {
    border-radius: 0;
}

.comparison-points {
    border-radius: 0;
}

/* 設置場所セクション */
.installation {
    padding: 5rem 10%;
    background: var(--light-gray);
}

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

.knowledge-card {
    border-radius: 0;
    overflow: hidden;
}

.knowledge-card a {
    border-radius: 0;
}

.knowledge-card i {
    border-radius: 0;
}

/* FAQ Section */
.faq {
    padding: 5rem 10%;
    background: var(--white);
}

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

.faq-card {
    border-radius: 0;
    overflow: hidden;
}

.faq-card h3 {
    border-radius: 0;
}

.faq-card p {
    border-radius: 0;
}

.manufacturer-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
    height: 100%;
}

.manufacturer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 0;
}

.manufacturer-card img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    margin-bottom: 1rem;
}

.comparison-points {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.comparison-points span {
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}



.recommendation-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.tab-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.tab-btn.active {
    border-bottom: 2px solid var(--secondary-color);
    color: var(--secondary-color);
}

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

.product-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Knowledge Section */
.knowledge {
    padding: 5rem 10%;
    background: var(--light-gray);
}

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

.knowledge-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.knowledge-card:hover {
    transform: translateY(-5px);
}

.knowledge-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Blog Section */
.blog {
    padding: 5rem 10%;
    background: var(--light-gray);
}

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

/* Blog Categories */
.blog-categories {
    padding: 5rem 10%;
    background: var(--white);
}

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

.category-card {
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Article Page */
.article-header {
    padding: 5rem 10%;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../images/article-bg.jpg');
    background-size: cover;
    background-position: center;
    color: var(--white);
    text-align: center;
}

.article-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 0.9rem;
}

.article-meta span {
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.category {
    background: var(--secondary-color);
}

.date {
    background: var(--light-gray);
}

.reading-time {
    background: rgba(255,255,255,0.2);
}

.article-content {
    padding: 5rem 10%;
}

.featured-image {
    margin: 2rem 0;
}

.featured-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 10px;
}

.article-section {
    margin-bottom: 3rem;
}

.article-section h2 {
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.comparison-table {
    margin: 2rem 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    border: 1px solid #ddd;
}

.comparison-table th {
    background: var(--light-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background: var(--light-gray);
}

.feature-card i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.share-buttons {
    margin: 4rem 0;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-btn {
    padding: 0.5rem;
    border-radius: 50%;
    background: var(--white);
    color: var(--dark-gray);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-btn:hover {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.related-articles {
    margin-top: 4rem;
}

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

.article-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.article-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-card h4 {
    padding: 1rem;
    margin: 0;
}

.article-card p {
    padding: 0 1rem 1rem;
    color: var(--dark-gray);
}

.blog-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-5px);
}

.blog-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-content {
    padding: 1.5rem;
}

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

.blog-content p {
    margin-bottom: 1rem;
    color: var(--dark-gray);
}

.date {
    display: block;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.blog-more {
    text-align: center;
    margin-top: 2rem;
}

.blog-more a {
    display: inline-block;
}

/* FAQ Section */
.faq {
    padding: 5rem 10%;
}

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

.faq-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Footer */
footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 3rem 10% 1rem;
}

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

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

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .manufacturer-grid,
    .product-comparison,
    .knowledge-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }

    .search-bar {
        flex-direction: column;
    }
}