:root {
    --deep-blue: #001F3F;
    --light-blue: #7FDBFF;
    --accent-color: #FF4136;
    --white: #FFFFFF;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--white);
    margin: 0;
    padding: 0;
    background-color: var(--deep-blue);
}

header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
    background-color: rgba(0, 31, 63, 0.9);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--light-blue);
}

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

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--white);
    font-weight: 300;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--light-blue);
}

main {
    padding-top: 60px;
}

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 5%;
    background: linear-gradient(135deg, #001F3F 0%, #0A4B78 100%);
    overflow: hidden;
}

.hero-content {
    max-width: 50%;
    z-index: 2;
}

.hero-image-container {
    width: 50%;
    max-width: 600px;
}

.hero-image {
    width: 100%;
    height: auto;
    transform: perspective(1000px) rotateY(-15deg);
    transition: transform 0.3s ease;
}

.hero-image:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-title {
    font-size: 5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

h1 {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 300;
}

section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 700;
}

.about p, .privacy p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 1rem;
    font-weight: 300;
}

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

.feature-item {
    text-align: center;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--light-blue);
}

.feature-item p {
    font-weight: 300;
    font-size: 0.9rem;
}

.contact {
    text-align: center;
}

.contact-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.contact-button:hover {
    background-color: var(--light-blue);
    color: var(--deep-blue);
    transform: translateY(-3px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: rgba(0, 31, 63, 0.9);
    font-weight: 300;
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 4rem 5% 2rem;
    }

    .hero-content, .hero-image-container {
        max-width: 100%;
        width: 100%;
    }

    .hero-image-container {
        margin-top: 2rem;
    }

    .hero-title {
        font-size: 4rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 3rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
}