/* The width of the empty space in the sidebar to separate
   content from the edge of the window */
$far_left_gutter_size: 10px;
/* This represents the space in the sidebar reserved for symbols like
   the #; labels like the the stream name go to the right of this. */
$left_col_size: 19px;
/* The full topic indentation includes 4px of indent in addition to
   the above (and another 5px of padding not measured here) */
$topic_indent: calc($far_left_gutter_size + $left_col_size + 4px);
$topic_resolve_width: 13px;
/* Space between section in the left sidebar. */
$sections_vertical_gutter: 8px;
$bottom_scrolling_buffer: 25px;
/* space PM / stream / topic names from unread counters / @ mention
indicators by 3px on the right */
$before_unread_count_padding: 3px;

.hashtag {
    &:empty {
        &::after {
            content: "#";
            line-height: 0;
            font-size: 18px;
            font-weight: 800;
        }
    }
}

.stream-privacy {
    font-size: 15px;
    font-weight: 800;
    min-width: $left_col_size;
    text-align: center;

    .zulip-icon.zulip-icon-globe {
        font-size: 12px;
        position: relative;
        top: 1px;
    }

    .zulip-icon.zulip-icon-hashtag {
        font-size: 13px;
        position: relative;
        top: 1.5px;
    }

    .zulip-icon.zulip-icon-lock {
        font-size: 13px;
    }
}

#left-sidebar .filter-icon i {
    padding-right: 3px;

    &.zulip-icon-lock {
        position: relative;
        top: 2px;
    }
}

#stream_filters,
#global_filters {
    margin-right: 12px;
}

li.show-more-topics {
    & a {
        font-size: 12px;
        margin-left: $topic_resolve_width;
    }
}

#streams_inline_icon,
.streams_filter_icon {
    float: right;
    opacity: 0.5;
    padding: 3px;
    margin-left: 4px;

    &:hover {
        opacity: 1;
        cursor: pointer;
    }
}

.streams_inline_icon_wrapper {
    float: right;
}

.streams_filter_icon.web_public {
    margin-right: 10px;
}

#streams_inline_icon {
    margin-right: 8px;
}

.tooltip {
    max-width: 18em;
}

#stream_filters {
    overflow: visible;
    margin-bottom: 5px;
    margin-right: 12px;
    padding: 0;
    font-weight: normal;

    .input-append.topic_search_section {
        padding: 2px 0 2px calc($topic_indent - $topic_resolve_width);
        margin-bottom: 3px;
        margin-left: 3px;

        & input {
            width: calc(100% - 50px);
        }
    }

    & li {
        & a:hover {
            text-decoration: none;
        }

        & ul {
            margin-left: 0;

            &.topic-list li {
                padding: 2px 0 2px calc($topic_indent - $topic_resolve_width);

                &.filter-topics {
                    padding-bottom: 0;
                    position: sticky;
                    top: calc($sections_vertical_gutter + 43px);
                    z-index: 2;
                }
            }
        }
    }

    .subscription_block .unread_count {
        margin-right: 15px;
    }

    .subscription_block {
        margin-right: 25px;
        margin-left: $far_left_gutter_size;
        display: flex;
        align-items: center;
        white-space: nowrap;

        &.stream-with-count {
            margin-right: 15px;
        }
    }

    .inactive_stream:not(.active-filter) {
        opacity: 0.5;
    }

    .toggle_stream_mute {
        margin-right: 3px;
        opacity: 0.5;

        &:hover {
            opacity: 1;
        }
    }
}

.narrows_panel {
    & li a {
        margin-top: 1px;

        &:hover {
            text-decoration: none;
        }
    }
}

#left_sidebar_scroll_container {
    outline: none;
    overflow-x: hidden;
    overflow-y: auto;
    position: relative;
    z-index: 0;
    width: 100%;
}

.private_messages_container {
    margin-right: 16px;
    margin-left: 6px;
    z-index: 1;

    #toggle_private_messages_section_icon {
        opacity: 0.7;
        margin-left: -15px;
        min-width: 12px;

        &.fa-caret-right {
            position: relative;
            left: 3px;
        }

        &:hover {
            opacity: 1;
        }
    }

    #private_messages_section_header {
        cursor: pointer;
        padding: 0 10px 1px 6px;
        white-space: nowrap;

        #show_all_private_messages {
            right: 0;
            float: right;
            position: absolute;
            opacity: 0.7;
            text-decoration: none;
            color: inherit;
            margin-right: 21px;
            margin-top: 1px;

            &:hover {
                opacity: 1;
            }
        }

        .unread_count {
            margin-right: 16px;
            margin-top: 2px;
        }
    }

    & ul.pm-list {
        list-style-type: none;
        font-weight: 400;
        margin-left: 0;
        margin-bottom: 0;

        & span.fa-group {
            font-size: 90%;
        }

        & li.pm-list-item {
            position: relative;
            padding: 1px 10px 1px 4px;
            margin-left: 2px;

            & a {
                text-decoration: none;
                color: inherit;
            }

            .pm_left_col {
                min-width: $left_col_size;

                & span:not(.user_circle) {
                    opacity: 0.7;
                }
            }
        }

        & li#show_more_private_messages {
            cursor: pointer;
            padding-right: 26px;
            padding-left: 6px;

            & a {
                font-size: 12px;
            }

            .unread_count {
                margin-top: 2px;
            }
        }
    }
}

.active_private_messages_section {
    #private_messages_section,
    #private_messages_list,
    #hide_more_private_messages {
        background-color: hsl(202deg 56% 91%);
    }

    #private_messages_section {
        border-radius: 4px 4px 0 0;
    }

    #private_messages_list {
        border-radius: 0 0 4px 4px;
    }

    #more_private_messages_sidebar_title {
        font-weight: 600;
    }
}

:not(.active-sub-filter) {
    &.top_left_row:hover,
    &.bottom_left_row:hover {
        background-color: var(--color-background-hover-narrow-filter);
        border-radius: 4px;
    }
}

#stream_filters .narrow-filter.highlighted_stream {
    &.active-filter > .bottom_left_row {
        background-color: var(--color-background-hover-narrow-filter);
    }

    &.active-filter .topic-list .bottom_left_row {
        background-color: var(--color-background-active-narrow-filter);
    }

    .bottom_left_row:not(.active-sub-filter) {
        background-color: var(--color-background-hover-narrow-filter);
    }
}

#login-link-container,
#subscribe-to-more-streams {
    text-decoration: none;
    margin: 5px auto 5.5px 10px;
    margin-bottom: $bottom_scrolling_buffer;

    & i {
        min-width: 19px;
        text-align: center;

        &::before {
            padding-right: 3px;
        }
    }
}

ul.filters {
    list-style-type: none;
    margin-left: 0;
    color: hsl(0deg 0% 20% / 100%);

    & a {
        color: inherit;

        &:focus {
            text-decoration: none;
        }
    }

    & hr {
        margin-top: 10px;
        margin-bottom: 10px;
    }

    .has-only-muted-unreads {
        .unread_count {
            opacity: 0.5;
        }
    }

    .has-only-muted-mentions .unread_mention_info {
        opacity: 0.5;
    }

    /* This is a noop in the current design, because unread counts for
       muted streams have the same opacity, but the logic is here to
       be explicit and because the design may change in the future. */
    .more_topic_unreads_muted_only .unread_count {
        opacity: 0.5;
    }

    & li.muted_topic,
    li.out_of_home_view {
        color: hsl(0deg 0% 20% / 50%);

        .has-unmuted-mentions .unread_mention_info {
            color: hsl(0deg 0% 20%);
        }

        .stream-privacy {
            opacity: 0.5;
        }

        & .unread_count {
            opacity: 0.5;
        }

        .has-unmuted-unreads {
            .unread_count {
                opacity: 1;
            }
        }

        & li.unmuted_topic {
            color: hsl(0deg 0% 20%);

            .unread_count {
                opacity: 1;
            }
        }
    }

    & li.out_of_home_view {
        &:hover {
            color: hsla(0deg 0% 20% / 75%);

            .stream-privacy {
                opacity: 0.75;
            }

            .unread_count {
                opacity: 0.75;
            }

            .has-unmuted-unreads {
                .unread_count {
                    opacity: 1;
                }
            }
        }

        & li.muted_topic {
            /* If stream is muted, this resets opacity of muted topics in muted
            stream to 1; since opacity is multiplied down through child
            elements, this avoids an unreadably low opacity. */
            opacity: 1;
        }
    }
}

li.active-filter,
li.active-sub-filter {
    font-weight: 600 !important;
    position: relative;
    border-radius: 4px;
    background-color: var(--color-background-active-narrow-filter);
}

#stream_filters .narrow-filter.active-filter {
    .topic-list .filter-topics,
    > .bottom_left_row {
        background-color: var(--color-background-active-narrow-filter);
        border-radius: 4px;
    }
}

#global_filters {
    margin-bottom: $sections_vertical_gutter;

    .filter-icon {
        display: inline-block;
        min-width: $left_col_size;
        text-align: center;
    }

    .top_left_row .unread_count {
        margin-right: 20px;
        margin-top: 2px;
        display: none;
    }

    .top_left_starred_messages .unread_count,
    .top_left_drafts .unread_count,
    .top_left_scheduled_messages .unread_count {
        background-color: inherit;
        color: inherit;
        border: 0.5px solid hsl(105deg 2% 50%);
        /* The border takes up space, so we need to
           subtract 1px from the usual 2px margin-top */
        margin-top: 1px !important;
    }

    & i {
        opacity: 0.7;
    }
}

li.top_left_all_messages,
li.top_left_mentions,
li.top_left_starred_messages,
li.top_left_drafts,
li.top_left_recent_topics,
li.top_left_scheduled_messages {
    position: relative;
    padding-top: 1px;
    padding-bottom: 1px;

    & a {
        display: block;
    }
}

.top_left_row {
    padding-left: $far_left_gutter_size;
    padding-right: 10px;
}

.conversation-partners {
    line-height: 1.25;
}

.top_left_all_messages i.fa-align-left {
    position: relative;
    font-size: 15px;
}

.top_left_mentions i.fa-at,
.top_left_starred_messages i.fa-star {
    font-size: 13px;
}

.topic-box {
    padding-left: 5px;
    margin-right: 30px;
}

.sidebar-topic-check {
    display: flex;
    align-items: center;
    min-width: $topic_resolve_width;
    font-size: 15px;
    height: 20px;
}

.conversation-partners,
.topic-name,
.stream-name {
    flex: auto;
    min-width: 0;
    white-space: nowrap;
    overflow-x: hidden;
    overflow-x: clip;
    text-overflow: ellipsis;
    padding: 1px $before_unread_count_padding 1px 0;
}

.topic-name {
    /* TODO: We should figure out how to remove this without changing the spacing */
    line-height: 1.1;
}

.left_sidebar_menu_icon_visible {
    display: block !important;
}

/*
    All of our left sidebar handlers use absolute
    positioning.  We should fix that.
*/
.all-messages-sidebar-menu-icon,
.stream-sidebar-menu-icon,
.starred-messages-sidebar-menu-icon,
.drafts-sidebar-menu-icon,
.topic-sidebar-menu-icon {
    position: absolute;
    display: none;
    right: 10px;

    & i {
        padding-right: 0.25em;
        display: inline-block;
        width: 13px;
        vertical-align: middle;
    }

    /*
        If you hover directly over the ellipsis itself,
        show it in black.
    */

    &:hover {
        color: hsl(0deg 0% 0%) !important;
    }

    /*
        Hover does not work for touch-based devices like mobile phones.
        Hence the the icons does not appear, making the user unaware of its
        presence on such devices. The following media property displays the
        icon by default for such behaviour.
    */

    @media (hover: none) {
        display: block;
    }
}

/*
    The All messages and stream ellipsis-v (vertical 3 dots) are
    pretty similar.
*/
.all-messages-sidebar-menu-icon,
.starred-messages-sidebar-menu-icon,
.drafts-sidebar-menu-icon,
.stream-sidebar-menu-icon {
    top: 1px;
    right: 0;
    font-size: 1em;
    text-align: center;
    padding: 0 6px;
}

/*
    For topic ellipsis-v(vertical 3 dots) we use a slightly smaller
    font to show they're "lower" in the hierarchy,
    which also affects it positioning.
*/
.topic-sidebar-menu-icon {
    top: 2px;
    right: 0;
    font-size: 0.9em;
    text-align: center;
    padding: 1px 6px 0;
}

/*
    When you hover over list items, we hover
    the relevant ellipsis-v(vertical 3 dots) in light gray.
*/
li.top_left_all_messages:hover .all-messages-sidebar-menu-icon,
li.top_left_starred_messages:hover .starred-messages-sidebar-menu-icon,
li.top_left_drafts:hover .drafts-sidebar-menu-icon,
#stream_filters li:hover .stream-sidebar-menu-icon,
li.topic-list-item:hover .topic-sidebar-menu-icon {
    display: inline;
    cursor: pointer;
    color: hsl(0deg 0% 53%);
}

ul.topic-list {
    list-style-type: none;
    font-weight: normal;
}

li.topic-list-item {
    position: relative;
    padding-right: 5px;
}

.pm-box,
.topic-box {
    display: flex;
    padding-top: 1px;
    cursor: pointer;
    align-items: center;
}

.pm-box {
    margin-right: 16px;
    align-items: baseline; /* Sets .user_circle alignment relative to text; standard icons do not participate in flex. */

    .user_circle {
        min-width: 8px;
        height: 8px;
        margin-top: 0;
        margin-bottom: 0;
        margin-left: 2px;
        position: relative;
        top: 0;
    }

    .zulip-icon.zulip-icon-bot {
        font-size: 90%; /* Reduce the bulkiness of this icon */
        padding: 3px 0 3px 1px; /* Shift reduced icon a pixel left to maintain horizontal centering. */
    }
}

.zero-pm-unreads .pm-box,
.zero-topic-unreads .topic-box {
    margin-right: 15px;
}

.zoom-out {
    #topics_header {
        display: none;
    }

    .zoom-out-hide {
        display: none;
    }
}

#topics_header {
    position: sticky;
    top: 0;
    z-index: 2;
    margin-right: 10px;
    padding-top: $sections_vertical_gutter;
    color: hsl(0deg 0% 43%);
    background-color: var(--color-background);

    .show-all-streams {
        color: inherit;
        text-decoration: none;
        text-transform: uppercase;
        margin-left: calc($far_left_gutter_size + 2px);

        & i {
            margin: 0 6px 0 13px;
            position: relative;
            top: 1px;
        }
    }
}

#streams_header {
    margin-right: 12px;
    cursor: pointer;
    padding: $sections_vertical_gutter 0 3px calc($far_left_gutter_size + 2px);
    position: sticky;
    background-color: var(--color-background);
    /* Ideally, 0px should work here, but maybe simplebar is doing something
       that is creating `0.5px` extra gap in zoomed-in windows. */
    top: -0.5px;
    z-index: 1;

    & input {
        padding-right: 20px;
    }
}

.streams_subheader {
    font-size: 0.8em;
    font-weight: normal;
    padding-left: $far_left_gutter_size;
    cursor: pointer;
    text-align: center;
    margin-right: 12px;
    color: hsl(240deg 10% 50%);

    & span {
        display: flex;
        flex-direction: row;
        width: 100%;
        left: 0.5em;
        right: 0.5em;
        opacity: 0.5;
    }

    & span::before,
    span::after {
        content: " ";
        flex: 1 1;
        vertical-align: middle;
        margin: auto;
        border: 0.5px solid hsl(240deg 10% 50%);
        opacity: 0.2;
    }

    & span::before {
        margin-right: 0.5em;
    }

    & span::after {
        margin-left: 0.5em;
    }
}

.stream-list-filter {
    width: 216px;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.topic-list-filter {
    /* Input width = 100% - 30px right-margin - 6px right-padding */
    /* To keep the right edge of input along with its borders inline with other
       topic items we consider to subtract the space given for right margin of
       other items, and right padding of input element.  */
    width: calc(100% - 36px);
}

.zero_count {
    visibility: hidden;
}

.zero-topic-unreads.show-more-topics .topic-box {
    margin-right: 30px;
}

.searching-for-more-topics img {
    height: 16px;
    margin-left: 6px;
}

.zoom-in {
    .narrow-filter > .bottom_left_row {
        position: sticky;
        top: calc($sections_vertical_gutter + 20px);
        z-index: 2;
        padding-bottom: 1px;
        background-color: var(--color-background);
    }

    #subscribe-to-more-streams,
    .show-more-topics {
        display: none;
    }

    &.private_messages_container ul.pm-list {
        margin-bottom: $bottom_scrolling_buffer;
    }

    #more_private_messages_sidebar_title {
        display: inline;
    }

    #hide_more_private_messages {
        display: block;
        text-decoration: none;
        color: inherit;
        font-size: 12px;

        & span {
            display: block;
            padding: 2px 0 2px 4px;
        }

        &:hover {
            & span {
                background-color: hsl(120deg 12.3% 71.4% / 38%);
                border-radius: 4px;
            }
        }
    }

    .zoom-in-hide {
        display: none;
    }

    .zoom-in-sticky {
        position: sticky;
        top: 0;
        z-index: 1;
        padding: 3px 0 3px $far_left_gutter_size;
    }

    #show_all_private_messages {
        margin-right: 5px !important;
    }
}