body.feature-guide-open {
    overflow: hidden;
}

.feature-guide-dialog {
    width: min(680px, calc(100vw - 2rem));
    max-width: none;
    max-height: calc(100vh - 2rem);
    max-height: calc(100dvh - 2rem);
    box-sizing: border-box;
    margin: auto;
    padding: 0;
    overflow: auto;
    border: 1px solid var(--border-light, #d9dcda);
    border-radius: 6px;
    background: var(--background-primary, #fff);
    color: var(--text-primary, #171b1a);
    box-shadow: 0 12px 40px rgb(0 0 0 / 22%);
}

.feature-guide-dialog::backdrop {
    background: rgb(0 0 0 / 55%);
    backdrop-filter: blur(3px);
}

.feature-guide-header {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.65rem 1.25rem;
    border-bottom: 1px solid var(--border-light, #d9dcda);
    background: var(--background-primary, #fff);
}

.feature-guide-header h2 {
    margin: 0;
    font-family: var(--font-serif, Georgia, serif);
    font-size: clamp(1.35rem, 4.5vw, 1.75rem);
    font-weight: 600;
    line-height: 1.2;
}

.feature-guide-close {
    flex: 0 0 44px;
    width: 44px;
    min-height: 44px;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    font: 1.75rem/1 var(--font-sans, sans-serif);
    cursor: pointer;
}

.feature-guide-dialog a:focus-visible,
.feature-guide-close:focus-visible {
    outline: 2px solid var(--primary-color, #23575e);
    outline-offset: 3px;
}

.feature-guide-body {
    padding: 1.1rem 1.25rem 1.25rem;
}

.feature-guide-definition {
    margin: 0 0 1rem;
    font-family: var(--font-serif, Georgia, serif);
    font-size: 1.15rem;
    line-height: 1.5;
}

.feature-guide-figure {
    margin: 0;
}

.feature-guide-figure img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: contain;
}

.feature-guide-figure figcaption {
    display: grid;
    gap: 0.25rem;
    margin-top: 0.65rem;
    color: var(--text-secondary, #4b514f);
    font-family: var(--font-sans, sans-serif);
    font-size: 0.75rem;
    line-height: 1.5;
}

.feature-guide-source {
    margin: 0.9rem 0 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-light, #d9dcda);
    font-family: var(--font-sans, sans-serif);
    font-size: 0.75rem;
    line-height: 1.5;
}

.feature-guide-dialog a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
    overflow-wrap: anywhere;
}

@media (max-width: 480px) {
    .feature-guide-header {
        padding-inline: 0.9rem;
    }

    .feature-guide-body {
        padding: 0.9rem;
    }

    .feature-guide-definition {
        font-size: 1.05rem;
    }

    .feature-guide-figure img {
        max-height: 32vh;
        max-height: 32dvh;
    }
}