/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

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

/* Header */
.header {
    background-color: #2c3e50;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.nav-brand {
    text-align: left;
}

.brand-link {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    transition: opacity 0.3s ease;
    line-height: 1.3;
}

.brand-link:hover {
    opacity: 0.8;
}

.showcase-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: #e67e22;
}

.nav-menu {
    position: relative;
}

.hamburger {
    display: flex;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: #2c3e50;
    flex-direction: column;
    width: 300px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 1rem 0;
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 1rem 1.5rem;
    border-radius: 0;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: block;
}

.nav-link:hover {
    background-color: #e67e22;
    color: #fff;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Projects Section */
.projects {
    padding: 4rem 0;
    background-color: #f8f9fa;
}

.category-section {
    margin-bottom: 4rem;
}

.category-title {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
}

.category-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: #e67e22;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: #2c3e50;
    flex: 1;
    min-width: 200px;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background-color: #e67e22;
    color: #fff;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-description {
    margin-bottom: 1.5rem;
    color: #555;
    line-height: 1.7;
}

.project-preview {
    margin-bottom: 1.5rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.preview-placeholder {
    padding: 3rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.preview-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.preview-placeholder h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.preview-placeholder p {
    opacity: 0.9;
    margin-bottom: 0;
}

.view-project-btn {
    display: block;
    width: 100%;
    padding: 1rem;
    background-color: #e67e22;
    color: white;
    text-decoration: none;
    text-align: center;
    font-weight: 600;
    transition: all 0.3s ease;
}

.view-project-btn:hover {
    background-color: #d35400;
    color: white;
    transform: translateY(-2px);
}

.project-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.deploy-site-btn {
    display: block;
    width: 100%;
    padding: 0.8rem;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    text-align: center;
    font-weight: 600;
    transition: all 0.3s ease;
    border-radius: 0 0 8px 8px;
}

.deploy-site-btn:hover {
    background-color: #2980b9;
    color: white;
    transform: translateY(-2px);
}

.project-tech {
    color: #666;
    font-size: 0.9rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #e67e22;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 3rem 0;
    text-align: center;
}

.cta-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: #e67e22;
    color: #fff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background-color: #d35400;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* Footer */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-organizer {
    font-weight: 500;
}

.footer-copyright {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .logo a {
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .project-card {
        padding: 1.5rem;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .preview-placeholder {
        padding: 2rem 1rem;
    }
    
    .preview-icon {
        font-size: 2.5rem;
    }
    
    .cta-title {
        font-size: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .projects {
        padding: 3rem 0;
    }
    
    .project-card {
        padding: 1rem;
    }
    
    .preview-placeholder {
        padding: 1.5rem 1rem;
    }
    
    .preview-icon {
        font-size: 2rem;
    }
    
    .cta {
        padding: 2rem 0;
    }
}