.metrotabs-group {
    --metrotabs-accent: currentColor;
    --metrotabs-muted: color-mix(in srgb, currentColor 65%, transparent);
    --metrotabs-line: color-mix(in srgb, currentColor 12%, transparent);
    --metrotabs-radius: 6px;

    margin-block: 2em;
}

.metrotabs-tablist {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-block-end: 1.5em;
}

.metrotabs-tab-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    padding: 0.55em 1em;
    border: 0;
    background: none;
    color: var(--metrotabs-muted);
    font: inherit;
    font-weight: 500;
    cursor: pointer;
    transition:
        color 0.15s,
        background-color 0.15s,
        border-color 0.15s;

    &:hover,
    &[aria-selected="true"] {
        color: inherit;
    }

    &:focus-visible {
        outline: 2px solid currentColor;
        outline-offset: -2px;
    }
}

.tab-pane {
    scroll-margin-top: 12em;

    &:focus-visible {
        outline: 2px solid currentColor;
        outline-offset: 4px;
    }
}

.metrotabs-accordion-heading {
    display: none;
    margin: 0;
    font-size: inherit;

    button {
        display: flex;
        justify-content: space-between;
        inline-size: 100%;
        padding: 0.85em 0;
        border: 0;
        border-block-end: 1px solid var(--metrotabs-line);
        background: none;
        color: inherit;
        font: inherit;
        font-weight: 600;
        text-align: start;
        cursor: pointer;

        &::after {
            content: "+";
        }

        &[aria-expanded="true"]::after {
            content: "\2212";
        }
    }
}

.metrotabs-group[data-mode="accordion"] {
    .metrotabs-tablist {
        display: none;
    }

    .metrotabs-accordion-heading {
        display: block;
    }

    .tab-pane {
        padding-block: 1em;
    }
}

/* Vertical */
.metrotabs-group.is-vertical:not([data-mode="accordion"]) .metro-tabs-block {
    display: grid;
    grid-template-columns: minmax(10rem, max-content) 1fr;
    gap: 2rem;

    .metrotabs-tablist {
        grid-row: 1 / span 999;
        flex-direction: column;
        align-self: start;
        margin: 0;
    }

    .metrotabs-tab-trigger {
        justify-content: start;
        text-align: start;
    }
}

/* Style: Metro (default underline) */
.metrotabs-group:is(.is-style-metro, :not([class*="is-style-"])) {
    .metrotabs-tablist {
        gap: 0;
        border-block-end: 1px solid var(--metrotabs-line);
    }

    .metrotabs-tab-trigger {
        border-block-end: 2px solid transparent;
        margin-block-end: -1px;

        &[aria-selected="true"] {
            border-block-end-color: var(--metrotabs-accent);
        }
    }

    &.is-vertical .metrotabs-tablist {
        border-block-end: 0;
        border-inline-start: 1px solid var(--metrotabs-line);

        .metrotabs-tab-trigger {
            border-block-end: 0;
            border-inline-start: 2px solid transparent;
            margin: 0 0 0 -1px;

            &[aria-selected="true"] {
                border-inline-start-color: var(--metrotabs-accent);
            }
        }
    }
}

/* Style: Pills */
.metrotabs-group.is-style-pills .metrotabs-tab-trigger {
    border-radius: 999px;

    &[aria-selected="true"] {
        background: color-mix(in srgb, currentColor 10%, transparent);
    }
}

/* Style: Boxed */
.metrotabs-group.is-style-boxed {
    .metrotabs-tablist {
        gap: 0;
        margin: 0;
        border-block-end: 1px solid var(--metrotabs-line);
    }

    .metrotabs-tab-trigger {
        border: 1px solid transparent;
        border-radius: var(--metrotabs-radius) var(--metrotabs-radius) 0 0;
        margin-block-end: -1px;

        &[aria-selected="true"] {
            border-color: var(--metrotabs-line);
            border-block-end-color: Canvas;
            background: Canvas;
        }
    }

    &:not([data-mode="accordion"]) .tab-pane {
        padding: 1.5em;
        border: 1px solid var(--metrotabs-line);
        border-block-start: 0;
    }
}

/* Style: Segmented */
.metrotabs-group.is-style-segmented .metrotabs-tablist {
    display: inline-flex;
    gap: 2px;
    padding: 3px;
    border-radius: calc(var(--metrotabs-radius) + 3px);
    background: color-mix(in srgb, currentColor 8%, transparent);

    .metrotabs-tab-trigger {
        border-radius: var(--metrotabs-radius);

        &[aria-selected="true"] {
            background: Canvas;
            box-shadow: 0 1px 2px rgb(0 0 0 / 0.12);
        }
    }
}

/* Panel animation */
@media (prefers-reduced-motion: no-preference) {
    .metrotabs-group[data-animation="fade"] .tab-pane:not([hidden]) {
        animation: metrotabs-fade 0.2s ease-out;
    }

    .metrotabs-group[data-animation="slide"] .tab-pane:not([hidden]) {
        animation: metrotabs-slide 0.25s ease-out;
    }
}

@keyframes metrotabs-fade {
    from {
        opacity: 0;
    }
}

@keyframes metrotabs-slide {
    from {
        opacity: 0;
        translate: 0 0.5rem;
    }
}

/* Tab items saved outside a group (very old content) */
.metrotabs-orphan > summary {
    cursor: pointer;
    font-weight: 600;
}