body {
    background-color: #000000;
    color: #ffffff;
    font-family: 'Noto Sans JP', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    text-align: center;
}

.container {
    max-width: 800px;
    padding: 20px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.4;
}

.gradient-text {
    background: linear-gradient(to right, #22c55e, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 40px;
    color: #cccccc;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid transparent;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background-color: #2ecc71;
    color: #ffffff;
}

.btn-secondary {
    background-color: #1a1a1a;
    color: #ffffff;
    border-color: #555555;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2.2rem;
    }
    p {
        font-size: 1rem;
    }
    .buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn {
        width: 80%;
        justify-content: center;
    }
}