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

body {
    font-family: Arial, sans-serif;
    background: white;
    color: #1f2b4d;
    line-height: 1.6;
}

.simple-header {
    padding: 32px 10%;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    flex-direction: column;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    text-decoration: none;
    color: #41506f;
    font-weight: 600;
}

.back-link svg {
    width: 18px;
    height: 18px;
    transition: transform 0.2s ease;
}

.back-link:hover {
    color: #4777d9;
}

.back-link:hover svg {
    transform: translateX(-3px);
}

.simple-header h1 {
    font-size: 2.2rem;
}

.reserve-button {
    display: inline-block;
    padding: 10px 18px;
    background: #4777d9;
    color: white;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 700;
    white-space: nowrap;
}

.reserve-button:hover {
    background: #345ec2;
}

.section {
    padding: 60px 10%;
}

.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.card {
    padding: 28px;
    border: 1px solid #eee;
    border-radius: 18px;
}

.card h3 {
    margin-bottom: 10px;
    color: #4777d9;
}

.code {
    margin-top: 20px;
    margin-left: 10px;
}

.footer {
    padding: 40px 10%;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .simple-header {
        padding: 24px 6%;
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .simple-header h1 {
        font-size: 1.8rem;
        line-height: 1.2;
    }

    .section {
        padding: 40px 6%;
    }

    .cards {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .card {
        padding: 22px;
    }
}

@media (max-width: 480px) {
    .simple-header {
        padding: 20px 5%;
    }

    .simple-header h1 {
        font-size: 1.5rem;
    }

    .back-link {
        font-size: 0.95rem;
    }

    .section {
        padding: 32px 5%;
    }

    .card {
        padding: 20px;
        border-radius: 14px;
    }

    .card h3 {
        font-size: 1.1rem;
    }

    .card p {
        font-size: 0.95rem;
    }
}