.guestbook-body .content-section {
    position: relative;
    min-height: 100vh;
}

.guestbook-body .content-section::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-image: url('pictures/bg-guestbook.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.32;
    filter: saturate(1.05);
}

.guestbook-body .content-section::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 20% 20%, rgba(34, 211, 238, 0.15), transparent 55%), radial-gradient(circle at 80% 30%, rgba(0, 255, 136, 0.12), transparent 60%);
}

.guestbook-page__nav {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 24px;
    padding: 0 12px;
}

.guestbook-page {
    display: grid;
    gap: 40px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px 60px;
}

.guestbook-page__intro {
    text-align: center;
    color: #b0b0b0;
}

.guestbook-page .guestbook-form,
.guestbook-page .guestbook-list {
    max-width: 920px;
    margin: 0 auto;
    width: 100%;
}

.guestbook-page .guestbook-form input,
.guestbook-page .guestbook-form textarea {
    font-size: 1.1rem;
    padding: 16px 20px;
}

.guestbook-page .guestbook-submit {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.guestbook-page__note {
    font-size: 0.9em;
    text-align: center;
    color: #94a3b8;
}

@media (max-width: 600px) {
    .guestbook-page__nav {
        justify-content: center;
    }
}