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

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Navigation */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 0.8rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(5px);
}

.nav-brand {
    display: flex;
    align-items: center;
}

.nav-logo {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin: 0 0.5rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.nav-links a:hover {
    background-color: #f0f0f0;
    color: #007bff;
}

.nav-links a.active {
    background-color: #007bff;
    color: white;
}

.nav-links i {
    margin-right: 0.4rem;
}

/* Hero Section */
.hero {
    height: 200px; /* 高さを半分に調整 */
    background: linear-gradient(135deg, #0396FF 0%, #ABDCFF 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('./img/logo_a3.png') center/contain no-repeat;
    opacity: 0.1;
    animation: pulse 4s infinite;
}

@keyframes pulse {
    0% { opacity: 0.1; }
    50% { opacity: 0.15; }
    100% { opacity: 0.1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 1rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 2.5rem);
    margin-bottom: 0.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    opacity: 0.9;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Main Content */
main {
    padding-bottom: 4rem;
}

/* Footer */
footer {
    background-color: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 0.5rem;
    }

    .nav-brand {
        margin-bottom: 0.5rem;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        text-align: center;
    }

    .nav-links li {
        margin: 0.3rem 0;
    }

    .nav-links a {
        display: block;
        padding: 0.8rem;
    }

    .hero {
        height: 150px;
        margin-top: 180px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 1rem;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 2rem; }
.mt-4 { margin-top: 2rem; }