/* 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 direct message / stream / topic names from unread counters
and @ mention indicators by 3px on the right */
$before_unread_count_padding: 3px;

.hashtag {
    &:empty {
        &::after {
            content: "#";
            line-height: 0;
            font-size: 18px;
            font-weight: 700;
        }
    }
}

#streams_list .stream-privacy {
    height: 16px;
    font-weight: 700;
    text-align: center;

    .zulip-icon.zulip-icon-globe {
        font-size: 12px;
    }

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

    .zulip-icon.zulip-icon-lock {
        font-size: 13px;
        /* Slight vertical adjustment so the lock
           doesn't sit too high, relative to the
           other stream icons. */
        padding-top: 2px;
    }
}

.sidebar-topic-check,
.topic-name,
.topic-markers-and-controls {
    cursor: pointer;
}

#left-sidebar-navigation-list .filter-icon i {
    padding-right: 3px;
    color: var(--color-left-sidebar-navigation-icon);
}

#stream_filters,
#left-sidebar-navigation-list {
    margin-right: 12px;
}

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

#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;
    margin-right: 8px;
}

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

.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);
        }

        .clear_search_button {
            margin-left: -1px;
        }
    }

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

        & ul {
            margin-left: 0;

            &.topic-list li {
                padding: 2px 0;

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

    .stream-with-count.hide_unread_counts {
        .masked_unread_count {
            display: block;
            /* Shift masked dot to align with
               the least-significant digit on
               unreads in other rows.
               We have to do this with margin,
               because width or padding will
               distort the CSS-created dot. */
            margin-right: 3px;
        }

        .unread_count {
            display: none;
        }
    }

    .narrow-filter
        > .bottom_left_row:hover
        > .stream-with-count.hide_unread_counts {
        .masked_unread_count {
            display: none;
        }

        .unread_count {
            display: inline;
        }
    }

    .stream-expanded {
        .stream-with-count.hide_unread_counts {
            .masked_unread_count {
                display: none;
            }

            .unread_count {
                display: inline;
            }
        }
    }

    .has-unmuted-unreads.hide_unread_counts {
        .masked_unread_count {
            display: none;
        }

        .unread_count {
            display: inline;
        }
    }

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

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

        &:hover {
            opacity: 1;
        }
    }
}

.left-sidebar-navigation-area {
    & 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;
        }

        & .masked_unread_count {
            opacity: 0.5;
        }

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

        & li.unmuted_or_followed_topic {
            color: var(--color-unmuted-or-followed-topic-list-item);

            .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;
    }
}

#left-sidebar-navigation-list {
    margin-bottom: $sections_vertical_gutter;

    .left-sidebar-navigation-label-container {
        display: flex;
        padding-right: 20px;

        .left-sidebar-navigation-label {
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;

            flex-grow: 1;
        }
    }

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

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

    .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;
    }

    .zulip-icon-inbox,
    .zulip-icon-star-filled {
        font-size: 14px;
        top: 2px;
        position: relative;
    }
}

li.top_left_all_messages,
li.top_left_mentions,
li.top_left_starred_messages,
li.top_left_drafts,
li.top_left_inbox,
li.top_left_recent_view,
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;
    display: flex;
    width: 100%;
    overflow: hidden;
}

.conversation-partners .status-emoji {
    /* Prevent status emoji from colliding
       with unread counts. */
    margin-right: 3px;
}

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

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

/* New .topic-box grid definitions here. */
.subscription_block,
.topic-box {
    display: grid;
    align-items: center;
    /* This general pattern of elements applies to every single row in the left
       sidebar, to some degree or another. Eventually, these template areas
       could be applied to all rows, with different `grid-template-column`
       values applied as needed (and shared as needed). For example, an element
       with no "starting-offset" sets that area to `0`; so too with other non-
       existent elements.

       The offsets themselves are meant to greedily assign all of the available
       horizontal space to the content area of the row. That space can then be
       modified or reassigned as needed, without running up against `padding`
       (which alters the box size) or `margin` (which notoriously bleeds outside
       of the element it's defined on). */
    grid-template-areas: "starting-offset starting-anchor-element row-content markers-and-controls ending-anchor-element ending-offset";
}

.subscription_block {
    grid-template-columns:
        7px 22px minmax(0, 1fr) minmax(0, max-content)
        30px 0;
    white-space: nowrap;

    .stream-privacy {
        grid-area: starting-anchor-element;
    }

    .stream-name {
        grid-area: row-content;
    }
}

.topic-box {
    /* Padding from original .topic-box definition. */
    padding-top: 1px;
    grid-template-columns:
        25px $topic_resolve_width minmax(0, 1fr) minmax(0, max-content)
        30px 0;
}

.topic-box .zero_count {
    display: none;
}

.sidebar-topic-check {
    grid-area: starting-anchor-element;
    font-size: 15px;
    height: 20px;
}

.topic-name {
    grid-area: row-content;
    padding: 1px 0;

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

    /* TODO: Consolidate these styles with conversation partners and stream name
       once grid rewrite is complete on all sidebar rows.

       Also: note that these styles will be moot for topic names once we allow
       for multiline topics. If we hold multiline topics to a certain number
       of lines, we'll likely need a JavaScript-based solution like Clamp.js
       to display an ellipsis on the final visible line. */
    white-space: nowrap;
    /* Both `hidden` and `clip` are shown for the sake
       of older browsers that do not support `clip`. */
    overflow-x: hidden;
    overflow-x: clip;
    text-overflow: ellipsis;
}

.stream-markers-and-controls,
.topic-markers-and-controls {
    grid-area: markers-and-controls;
    display: flex;
    /* Present a uniform space between icons */
    gap: 5px;
    align-items: center;

    .unread_mention_info {
        /* Unset margin in favor of flex gap. */
        margin: 0;
    }

    .unread_count {
        /* Height is set here by the flexbox; this
           decouples .unread_count from the app-wide
           definition. */
        height: auto;
    }
}

.bottom_left_row .subscription_block .sidebar-menu-icon,
.bottom_left_row .topic-box .sidebar-menu-icon {
    position: static;
    grid-area: ending-anchor-element;
}

.conversation-partners-list,
.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;
}

.conversation-partners-list {
    /* Don't allow growth, so that status emoji
       remain adjacent the username. */
    flex: 0 1 auto;
}

.left_sidebar_menu_icon_visible {
    display: block !important;
}

/*
    All of our left sidebar handlers use absolute
    positioning.  We should fix that.
*/
.top_left_row .sidebar-menu-icon,
.bottom_left_row .sidebar-menu-icon {
    position: absolute;
    display: none;
    top: 1px;
    right: 0;
    font-size: 1em;
    text-align: center;
    padding: 0 6px;

    & i {
        padding-right: 0.35em;
        display: inline-block;
        width: 13px;
        font-size: 17px;
        vertical-align: middle;
    }

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

    &:hover {
        color: var(--color-vdots-hover);
    }

    /*
        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;
        /* Show dots on touchscreens in a less distracting,
           lighter shade. */
        color: var(--color-vdots-hint);
    }
}

/*
    When you hover over list items, we hover
    the vdots in light gray.

    The stream icon should always display when
    any topic is hovered, which is why it gets
    a more specific selector here.
*/
#stream_filters li:hover .stream-sidebar-menu-icon,
.top_left_row:hover .sidebar-menu-icon,
.bottom_left_row:hover .sidebar-menu-icon {
    display: inline;
    cursor: pointer;
    color: var(--color-vdots-visible);

    /*
        If you hover directly over the vdots icon,
        show it in black.
    */
    &:hover {
        color: var(--color-vdots-hover);
    }
}

/*
    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.
*/
.bottom_left_row .topic-sidebar-menu-icon {
    font-size: 0.9em;
    /* Strip the line height back to the font size,
       so that vertical positioning is handled by
       grid exclusively. */
    line-height: 1;
}

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

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

.pm-box {
    display: flex;
    padding-top: 1px;
    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 {
    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-append {
        white-space: nowrap;
        margin-bottom: 10px;

        & input {
            padding-right: 20px;
        }

        .clear_search_button {
            margin-left: -1px;
        }
    }
}

.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;
    }
}