:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --text-color: #2c3e50;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-color);
    padding-top: 76px;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.3s ease;
}

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

#hero {
    background: url('assets/images/サイバーパンク系ヒーローイメージ.jpg') center/cover no-repeat;
    padding: 100px 0;
    position: relative;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(246, 248, 250, 0.9) 0%, rgba(233, 236, 239, 0.85) 100%);
}

#hero .container {
    position: relative;
    z-index: 1;
}

#hero h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.15rem;
    line-height: 1.7;
}

section {
    padding: 80px 0;
}

section h2 {
    color: var(--primary-color);
    position: relative;
    padding-bottom: 15px;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background-color: var(--secondary-color);
}

.card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    margin-bottom: 2rem;
}

#projects .card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    margin-bottom: 1rem;
}

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

.badge {
    padding: 0.5em 1em;
    font-weight: 500;
}

.bg-light {
    background-color: var(--light-bg) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
    transform: translateY(-2px);
}

footer {
    background-color: #2c3e50;
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
    
    #hero {
        padding: 60px 0;
    }
}