zulip/web/styles/search.css

#searchbox {
    width: 100%;
    height: var(--header-height);

    .navbar-search {
        margin: 0.2187em 0; /* 3.5px at 16px em */
        border-radius: 5px;
        position: absolute;
        overflow: hidden;
        /* We bump the z-index to keep the search box
           clickable despite position-based layout
           adjustments. */
        z-index: 1;
    }

    .search_icon {
        grid-area: search-icon;
        align-self: center;
        text-decoration: none;
        padding: 0 0.4117em; /* 7px at 17px em */
        font-size: 1.0625em; /* 17px at 16px em */
        border: none;
        background-color: transparent;
        color: var(--color-search-icons);
        opacity: 0.5;
        cursor: default;

        &:active,
        &:focus {
            outline: none;
        }

        &:disabled {
            visibility: hidden;
        }
    }

    .search_close_button {
        grid-area: search-close;
        width: 1.75em; /* 28px at 16px em */
        height: 100%;
        background: none;
        border: none;
        opacity: 0.5;
        line-height: 0;
        border-radius: 4px;
        /* Reset iOS button defaults. */
        color: var(--color-search-icons);
        padding: 0;
        outline: none;

        &:hover {
            opacity: 1;
        }

        &:focus-visible {
            outline: 2px solid var(--color-outline-focus);
            outline-offset: -3px;
        }

        &:disabled {
            visibility: hidden;
        }
    }

    .search-input-and-pills {
        grid-area: search-pills;
        display: flex;
        padding: 0;
        flex-wrap: wrap;
        gap: 0.125em; /* 2px at 16px em */
        align-self: center;
    }

    .navbar-search:not(.expanded) {
        right: 0;

        .search_close_button {
            display: none;
        }

        #searchbox-input-container {
            width: var(--search-box-width);
        }

        .search-input {
            border-radius: 5px;
            color: var(--color-text-search);
            box-shadow: none;
        }

        &:hover {
            cursor: pointer;

            @media (width >= $md_min) {
                box-shadow:
                    0 4px 20px var(--color-search-box-hover-shadow),
                    0 1px 5px var(--color-search-box-hover-shadow);
            }

            .search_icon {
                cursor: pointer;
            }
        }

        @media (width < $md_min) {
            .search-input {
                opacity: 0;
            }
        }

        @media (height < $short_navbar_cutoff_height) {
            #searchbox-input-container .search_icon {
                font-size: 1.125em; /* 18px at 16px/em */
            }
        }
    }

    .navbar-search.expanded {
        width: 100%;
        box-shadow:
            0 4px 20px var(--color-search-shadow-wide),
            0 1px 5px var(--color-search-shadow-tight);

        .search-input {
            cursor: text;
        }

        #searchbox-input-container.pill-container {
            /* Pill container should display the same background
               color as the search typeahead. */
            background-color: var(--color-background-search);
        }

        @media (width < $md_min) {
            /* 3px chosen so that the cursor clicks the search button
               and close button from the same position. */
            width: calc(100% - 3px);
            /* z-index to not see the gear icon underneath */
            z-index: 1;
        }
    }

    .typeahead.dropdown-menu {
        /* Match the typeahead's width to its parent container. */
        right: 0;
        top: 0;
        margin-top: 0;
        padding-top: 0;
        box-shadow: none;
        position: relative;
        width: 100%;
        background: var(--color-background-search);
        color: var(--color-text-search);

        border-width: 0;
        border-top-width: 1px;
        border-top-color: var(--color-search-dropdown-top-border);
        border-radius: 0 0 4px 4px;

        .active > a {
            background-color: var(--color-background-search-option-hover);
            background-image: none;
            color: var(--color-text-search-hover);
        }

        .typeahead-menu .simplebar-content {
            min-width: unset;
        }

        .typeahead-menu .simplebar-content > li > a {
            max-width: none;
        }
    }

    .input-append {
        position: relative;
        width: 100%;
        box-sizing: border-box;
        margin-bottom: 0;
    }

    .search-input {
        /* Avoid massive inheritance chain on font-size. */
        font-size: var(--base-font-size-px);
        /* override bootstrap padding for input[type="text"] */
        padding: 0;
        border: none;
        outline: none;
        border-radius: 0;
        font-family: "Source Sans 3 VF", sans-serif;
        font-weight: 400;
        background: transparent;
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: pre;
        flex-grow: 1;

        color: var(--color-text-search);

        display: flex;
        align-items: center;

        &:empty::before {
            content: attr(data-placeholder-text);
            color: var(--color-text-search-placeholder);
        }
    }

    #searchbox-input-container {
        display: grid;
        /* The next two styles override .input-append style from app_components.js */
        letter-spacing: normal;
        font-size: 100%;
        /* Override style for .pill-container that isn't relevant for search. */
        border: none;
        grid-template:
            "search-icon search-pills search-close" var(--search-box-height)
            ". search-pills ." auto / auto minmax(0, 1fr)
            1.75em; /* 28px at 16px em */
        align-content: center;
        cursor: pointer;

        /* Override styles for .pill-container that aren't relevant for search. */
        &.pill-container {
            background: inherit;
            /* Maintain only a column gap. */
            gap: 0 0.3125em; /* 5px at 16px em */
            /* Override padding. */
            padding: 0;
        }

        .pill {
            margin: 0;
            min-width: unset;
        }

        &:not(.focused) {
            height: var(--search-box-height);
            overflow: hidden;

            .search-input-and-pills {
                flex-wrap: nowrap;
                overflow: hidden;

                @media (height < $short_navbar_cutoff_height) {
                    line-height: var(--base-line-height-unitless);
                }
            }
        }

        &.focused .user-pill-container {
            flex-flow: row wrap;
        }

        .user-pill-container {
            gap: 2px 5px;
            /* Don't enforce a height, as user-pill containers
               can contain multiple user pills that wrap onto
               new lines. */
            height: unset;

            > .pill-label {
                min-width: fit-content;
                white-space: nowrap;
                width: fit-content;
                /* Replaced by the 5px gap. */
                margin-right: 0;
                /* Don't inherit large line-height for user pill labels. */
                line-height: 1.1;
            }

            .pill {
                /* Reduce user pill height by 2px to
                   preserve an apparent border around
                   them even under `box-sizing: border-box`
                   in the area. */
                height: calc(var(--height-input-pill) - 2px);
                border: none;
                /* Match border radius to image */
                border-radius: 4px;
                max-width: none;
                display: grid;
                grid-template-columns: auto 1fr auto;

                /* Don't inherit large line-height for user pills themselves, either. */
                line-height: 1.1;

                &:not(.deactivated-pill) {
                    background-color: var(--color-background-user-pill);
                }
            }
        }
    }

    .pill-label {
        min-width: 30px;
    }

    @media (width >= $md_min) {
        .navbar-search {
            background: var(--color-background-search);
        }

        .navbar-search:not(.expanded) {
            box-shadow: 0 0 2px var(--color-search-box-hover-shadow);
        }
    }

    @media (width < $md_min) {
        .navbar-search:not(.expanded) .search_icon:hover {
            opacity: 1;
        }

        .navbar-search.expanded {
            background: var(--color-background-search);
        }
    }

    @media (height < $short_navbar_cutoff_height) {
        #searchbox_form:not(.expanded) {
            margin: 0;
            /* Now that the header is shorter, the search box will take up the whole
               height (which looks weird), so add 1px of space above and below it
               by manipulating the margin and the height. */
            margin-top: 1px;
            height: calc(var(--header-height) - 3px);
        }

        /* It looks fine to fill the navbar when the typeahead is open. */
        #searchbox_form.expanded {
            margin-top: 1px;
        }
    }

    @media (width < $sm_min) {
        #searchbox_form.expanded {
            position: fixed;
            left: 0;
            right: 9px;
            width: 100%;
            border-radius: 0;
            box-shadow: none;
            /* To be visible over `.left-sidebar-toggle-unreadcount` */
            z-index: 20;
        }
    }

    .typeahead-menu .simplebar-content > li > a {
        padding: 3px 40px;
        /* Override white-space: nowrap from zulip.css */
        white-space: normal;

        .search_list_item {
            max-width: 100%;
        }

        .search_list_item .pill-container {
            margin: 1px 5px;
            /* This contains only one pill, which handles its own border */
            border: none;
            cursor: pointer;
            padding: 0;
            max-width: 100%;
        }

        .pill {
            align-items: baseline;
            margin: 0;

            &:focus {
                /* Keep the border the same color, there's no user interaction for users in the typeahead menu */
                border-color: var(--color-background-input-pill);
            }

            .exit {
                display: none;
            }
        }

        .pill-image {
            /* Add line-height equal to height to mimic baseline alignment. */
            line-height: var(--height-input-pill);
            align-self: center;
        }
    }

    /* Break really long words (unlikely to happen). */
    .search_list_item span {
        overflow-wrap: anywhere;
    }
}