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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: #000;
    color: #fff;
    height: 100vh;
    overflow: hidden;
}

.landing-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle, rgba(30, 30, 30, 1) 0%, rgba(0, 0, 0, 1) 100%);
}

.content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 800px;
    width: 100%;
    padding: 2rem;
    margin: 0 auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.title-image {
    max-width: 80%;
    margin-bottom: 2rem;
    animation: fadeIn 2s ease-in-out;
}

.logo-image {
    max-width: 35%; /* 50%から30%小さく */
    margin-bottom: 3rem;
    animation: fadeIn 2s ease-in-out 0.5s both;
}

.copyright {
    position: fixed;
    bottom: 10px;
    right: 20px;
    font-size: 0.45rem;
    opacity: 0.7;
    letter-spacing: 1px;
    animation: fadeIn 2s ease-in-out 1s both;
    text-align: right;
}

.start-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 400px;
    animation: fadeIn 2s ease-in-out 1.5s both;
}

.start-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    color: #fff;
    text-decoration: none;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.start-btn i {
    margin-right: 10px;
    font-size: 1.2rem;
}

.start-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.start-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}

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

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .content {
        padding: 1rem;
    }
    
    .title-image {
        max-width: 90%;
    }
    
    .logo-image {
        max-width: 70%;
    }
    
    .start-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}