.o_calendar_renderer {
    --o-circle-padding: calc(#{map-get($spacers, 1 )} / 2);
    --o-cw-border-color: #{$border-color};

    background-color: $o-view-background-color;

    @include media-breakpoint-down(lg) {
        border-top: 1px solid var(--o-cw-border-color);
    }

    // Simulate the old UI (FC v4)
    // the resizer on the bottom of the event styled with a = icon when hovered
    .fc-timegrid-event .fc-event-resizer {
        color: #fff;
        text-align: center;
        font-family: monospace;
    }
    .fc-timegrid-event:hover .fc-event-resizer:after {
        content: "=";
        display: inline-block;
        vertical-align: top;
        line-height: 0;
    }

    .fc-event {
        // `web/lib/fullcalendar/core/main.css` gives events with links and draggable events a hand mouse pointer,
        // but doesn't take into account that events have popovers.
        cursor: pointer;
        --fc-event-text-color: #{$body-color};
        --fc-event-bg-color: #{$o-view-background-color};
        overflow: hidden;

        @include media-breakpoint-down(md) {
            line-height: 1.2;
        }

        &:hover {
            color: $body-color;

            &:not(.o_event_dot) .fc-bg {
                --o-bg-opacity: .35;
            }
        }

        &.fc-event-mirror, &.fc-dragging {
            --o-bg-opacity: .25;
            border-color: rgba($o-action, .5);

            .fc-bg {
                background-color: rgba($o-action, var(--o-bg-opacity));
            }
        }

        &.fc-event-mirror {
            background-color: rgba($o-action, var(--o-bg-opacity));
        }

        &.o_past_event::after {
            content: '';
            @include o-position-absolute(0, 0, 0, 0);
            display: block;
            z-index: 3;
            background-color: rgba($o-view-background-color, var(--o-overlay-opacity));
        }

        &:not(.o_event_dot):not(.fc-dragging).o_cw_custom_highlight {
            box-shadow: 0px 8px 8px -7px rgba(0, 0, 0, 0.2);
            z-index: 2; // for the shadow to go over the events below
        }

        .fc-bg {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            transition: $transition-base;
        }

        .fc-event-main {
            > .o_event_title {
                @include media-breakpoint-down(lg) {
                    text-overflow: unset;
                    white-space: break-spaces;

                    > span {
                        word-break: break-word;
                    }
                }
            }
        }

        &:not(.o_event_dot) {
            --o-overlay-opacity: .5;

            &.o_event_hatched {
                --o-bg-opacity: .5;
            }
        }

        &.o_event_dot {
            --o-overlay-opacity: .25;

            display: flex;
            align-items: center;
            gap: map-get($spacers, 1);
            border: none;

            &:before {
                z-index: 2;
                display: inline-block;
                font-family: Fontawesome;
                content: '\f111'; // fa-circle
            }

            &:hover {
                --o-bg-opacity: 1;
            }

            &.o_event_hatched:before {
                --o-event-bg: var(--fc-event-text-color);

                content: "\f1db"; // fa-circle-thin
            }
        }
    }

    // Reset all link (A tag) the normal color (to override Bootstrap rule)
    // And also override WebEditor rules
    div.fc a {
        color: inherit;
    }

    .o_calendar_widget {
        // Remove background today color
        .fc-day-today:not(.o_calendar_disabled) {
            --fc-today-bg-color: none;
        }

        // Remove time indicator arrow
        .fc-timegrid-now-indicator-arrow {
            display: none;
        }

        // ===  Adapt calendar table borders and general layout ===
        // ========================================================
        --fc-page-bg-color: #{$o-view-background-color};
        --fc-border-color: var(--o-cw-border-color);

        .fc-body > tr > .fc-widget-content {
            border-top: 0;
        }

        .fc-widget-content, .fc-widget-header {
            border-bottom: 0;
        }

        hr.fc-widget-header {
            padding: 1px;
            border: 0;
            background: map-get($grays, "400");
        }

        .fc-scrollgrid {
            border-top: 0;
        }

        .fc-scrollgrid-section-header {
            .fc-timegrid-axis-frame.fc-scrollgrid-shrink-frame.fc-timegrid-axis-frame-liquid {
                > a.fc-timegrid-axis-cushion.fc-scrollgrid-shrink-cushion.fc-scrollgrid-sync-inner {
                    color: transparent;
                }
            }
        }

        .fc-more-popover {
            .fc-popover-header {
                padding-left: 1rem;
                .fc-popover-title {
                    font-weight: bold;
                }
            }

            .fc-popover-body {
                max-height: 500px;
                overflow: auto;
            }

            &.o_calendar_disabled {
                background-color: $gray-200;
            }
        }

        .o_calendar_disabled {
            background-color: rgba($gray-200, .5);
        }

        .fc-daygrid-day-bottom {
            display: flex;
            justify-content: center;

            .fc-more-link {
                color: $link-color;
                cursor: pointer;

                &:hover {
                    background: none;
                }
            }
        }

        // ======  Specific agenda types ======
        // ====================================

        // ====== Day only
        .fc-timeGridDay-view {
            .fc-col-header-cell {
                text-align: left;
                vertical-align: middle;

                a {
                    gap: map-get($spacers, 1);
                    margin-left: map-get($spacers, 1);
                }
                .o_cw_day_number {
                    padding: map-get($spacers, 1);
                    place-content: center;
                    line-height: 1;
                }
            }
        }

        // ====== Week only

        .fc-timeGridWeek-view {
            .fc-col-header-cell {
                text-align: center;

                a {
                    flex-direction: column;
                }

                .o_cw_day_number {
                    padding: map-get($spacers, 1);

                    @include media-breakpoint-up(lg) {
                        font-size: 1.25rem;
                    }
                }
            }
        }

        // ====== Both Day and Week agenda
        .fc-timeGridDay-view,
        .fc-timeGridWeek-view {
            --o-cw-bg: #{$o-calendar-today-background-color};
            --o-cw-color: #{$o-calendar-today-color};

            .fc-scrollgrid-section-body {
                &:not(.fc-scrollgrid-section-liquid) .fc-scroller-harness {
                    background-color: $o-view-background-color;
                }

                &:first-child td {
                    border-bottom: 0;
                }
            }

            .fc-col-header-cell {
                a {
                    display: flex;
                    align-items: center;
                }

                &.fc-day-today .o_cw_day_number {
                    color: var(--o-cw-color);
                    background-color: var(--o-cw-bg);
                    border-radius: 50%;
                    aspect-ratio: 1;
                }
            }

            // Remove dotted borders (half-hours)
            .fc-timegrid-slot-minor {
                border-top-style: none;
            }

            // Align labels and timelines
            .fc-timegrid-slot {
                font-size: .6rem;

                @include media-breakpoint-up(md) {
                    font-size: .75rem;
                }

                &.fc-timegrid-slot-label {
                    border-width: 0;

                    // Center the time label (vertical align to the center of the line)
                    .fc-timegrid-slot-label-cushion {
                        margin-top: -18px;
                        position: relative;
                        display: block;
                    }
                }
            }

            // Add a small gap on top to show the first time label (0:00)
            .fc-scroller.fc-scroller-liquid-absolute {
                padding-top: 15px;
            }

            // Row containing "all day" events
            .fc-timegrid-divider.fc-cell-shaded {
                position: relative;
                padding: 0;

                @include media-only(screen) {
                    &:after {
                        @include o-position-absolute($border-width, 0, -15px, 0);
                        background: linear-gradient(0deg, rgba($o-shadow-color, 0), rgba($o-shadow-color, 0.16));
                        pointer-events: none;
                        content: "";
                    }
                }
            }

            @include media-breakpoint-down(md) {
                .fc-daygrid-day .fc-daygrid-event {
                    margin: 1px;

                    .fc-event-main {
                        max-height: 1.2em;
                        white-space: nowrap;
                        overflow: hidden;
                    }
                }
            }


            // Create a 'pseudo-border' for the first row. The actual border
            // is hidden because of border-collapse settings.
            .fc-scrollgrid-section-liquid tr:first-child .fc-timegrid-slot.fc-timegrid-slot-lane:last-child {
                box-shadow: inset 0 1px 0 var(--o-cw-border-color);
            }

            .fc-event {
                --o-bg-opacity: .25;

                // Prevent events with similar color to visually overlap each other
                &:not(.o_event_allday):not(.o_homework_event) {
                    box-shadow: 0 0 0 1px $o-view-background-color;
                }

                .fc-event-main {
                    margin: map-get($spacers, 1);

                    @include media-breakpoint-up(md) {
                        margin-top: 0;
                        margin-bottom: 0;
                    }
                }
            }

            .fc-timegrid-event-harness-inset{
                transition: right .3s, left .3s;

                &:has(.fc-event.o_cw_custom_highlight:not(.fc-dragging)) {
                    z-index: $zindex-modal !important;
                    right: 0 !important;
                    left: 0 !important;
                    margin-right: 0 !important;
                }
            }

            // Avoid pointer event on the "Now Indicator" (red line)
            .fc-timegrid-now-indicator-line {
                pointer-events: none;
            }
        }

        .fc-timegrid-now-indicator-container {
            pointer-events: none;
            overflow: visible;
            border: none;
        }

        // ====== Week only
        .fc-timeGridWeek-view {
            // Reset position to keep the "nowIndicator" line visible
            @for $i from 1 through 7 {
                .fc-timegrid-col:not(.fc-timegrid-axis):nth-child(#{$i + 1}) .o_calendar_time_indicator_now {
                    $left: ($i - 1) * -100;
                    $right: (7 - $i) * -100;
                    left: #{$left + '%'};
                    right: #{$right + '%'};
                    position: absolute;
                    height: 1px;
                    background-color: var(--o-cw-bg);
                    opacity: 0.3;
                    transform: translateY(-100%);
                }

                // Add a dot shape at the start of the "Now Indicator" line
                .fc-timegrid-now-indicator-line::before {
                    content: "";
                    position: absolute;
                    height: .75rem;
                    width: .75rem;
                    border: $border-width solid $o-view-background-color;
                    border-radius: $border-radius-pill;
                    background-color: var(--o-cw-bg);
                    transform: translate(-50%, -50%);
                }
            }
        }

        // ====== Both Week and Month agenda

        .fc-timeGridWeek-view, .fc-dayGridMonth-view {
            .fc-col-header-cell a {
                text-transform: uppercase;
                font-size: $o-font-size-base-smaller;
            }
        }

        // ====== Both Month and Months in Year agenda

        .fc-dayGridMonth-view {
            .o-fc-week-header {
                color: transparent;
            }

            .o-fc-week, .o-fc-week-header {
                line-height: $line-height-sm;
                font-size: $o-font-size-base-smaller;
                opacity: .5;
                @include media-breakpoint-down(md) {
                    width: 3ch;
                }
            }

            .fc-col-header-cell, .o-fc-week-header {
                border-bottom: 0;
            }

            .fc-daygrid-body tr {
                .fc-daygrid-week-number {
                    line-height: $line-height-sm;
                    font-size: $o-font-size-base-smaller;
                    opacity: .8;

                    @include media-breakpoint-down(lg) {
                        > a {
                            font-size: .5rem;
                        }
                    }

                    @include media-breakpoint-up(lg) {
                        padding: map-get($spacers, 1);
                    }
                }
                .fc-day {
                    .fc-daygrid-day-top {
                        flex-direction: column;
                        align-items: center;
                        justify-content: center;

                        .fc-daygrid-day-number {
                            color: var(--o-cw-color);
                        }
                    }
                    .fc-daygrid-week-number {
                        // only in Month view
                        @include media-breakpoint-down(lg) {
                            background-color: $gray-100;
                        }
                    }

                    &.fc-day-other .fc-daygrid-day-top {
                        opacity: 0.8;

                        &:not(.fc-day-today) .fc-daygrid-day-number {
                            --o-cw-color: #{map-get($grays, "500")};
                        }
                    }

                    .fc-daygrid-day-number {
                        $padding-size: map-get($spacers, 1);
                        padding: $padding-size;
                        line-height: calc(100% + #{$padding-size});
                        aspect-ratio: 1/1;
                        border-radius: 50%;
                        background: var(--o-cw-bg, none);
                        text-align: center;
                    }

                    &.fc-day-today {
                        --o-cw-color: #{$o-calendar-today-color};
                        --o-cw-bg: #{$o-calendar-today-background-color};

                    }
                }
            }

            td:first-child {
                border-left: none;
            }

            .fc-bg .fc-day-today:not(.o_calendar_disabled) {
                background: none;
            }

            .fc-event {
                padding: 0 map-get($spacers, 1);

                .fc-event-main:not(.o_homework_single):not(.o_homework_multi) {
                    display: flex;
                    justify-content: start;
                    flex-direction: row;
                    max-height: 1.2em;
                    line-height: 100%;
                }
            }
        }

        // ====== Year only
        .fc-dayGridYear-view {
            --fc-neutral-bg-color: none;
            flex-direction: row;
            .fc-scroller {
                overflow: hidden !important; // FC set its own rules inline
            }

            table,
            tr,
            th,
            td {
                border: none;
            }

            &.fc-readonly-year-view {
                .fc-daygrid-day-top:not(.fc-has-event) {
                    &, a {
                        cursor: default !important;
                    }
                }
            }

            &:not(.fc-readonly-year-view) {
                .fc-daygrid-body tr .fc-day {
                    &.fc-day-today {
                        padding-top: 0;
                    }
                    .fc-daygrid-day-top {
                        &:hover > .fc-daygrid-day-number {
                            $-bg: mix($o-view-background-color, $o-action, 75%);

                            --o-cw-color: #{color-contrast($-bg)};
                            --o-cw-bg: #{$-bg};
                        }

                        .fc-daygrid-day-number:before {
                            height: 120%;
                        }
                    }
                }
            }

            > .fc-month-container {
                @include media-breakpoint-down(md) {
                    width: 100%;
                }

                > .fc-month {
                    width: 21rem;
                    margin: auto;

                    > .fc-toolbar.fc-header-toolbar {
                        margin-bottom: 4px;
                        cursor: default;
                        justify-content: start;

                        h2 {
                            font-size: $font-size-base;
                        }
                    }

                    .fc-widget-header {
                        position: static;
                        cursor: default;
                    }

                    .fc-dayGridMonth-view {
                        border-right: none;

                        .fc-has-event {
                            background-color: #b4dff5;
                        }

                        .fc-week-number {
                            cursor: default;
                            opacity: .5;
                        }

                        .fc-day-header {
                            font-size: $o-font-size-base-smaller;
                        }
                    }

                    .fc-daygrid-body tr {
                        .fc-daygrid-day-frame {
                            display: flex;
                            place-content: center;
                            min-height: 2rem;
                            line-height: 1;
                        }

                        .o-fc-week {
                            height: 100%;
                            vertical-align: middle;
                        }

                        .fc-daygrid-day-events {
                            display: none;
                        }
                    }

                    .fc-disabled-day {
                        background-color: unset;
                    }

                    .fc-daygrid-day-top {
                        text-align: center;
                        cursor: pointer;
                    }
                }
            }
        }
        // ====== RTL layout(s)
        &.fc-rtl {
            .fc-timeGrid-view .fc-event {
                border-width: 0 3px 0 0;
            }

            .fc-dayGridMonth-view .fc-event {
                border-width: 0 3px 0 0;

                &.fc-not-start {
                    margin: 0 0 1px 5px;
                    border-width: 0 0 0 3px;

                    .fc-event-main {
                        padding-right: 6px;
                        padding-left: 0;
                    }
                }

                &.fc-not-end {
                    margin: 0 5px 1px 0;

                    .fc-event-main {
                        padding-left: 6px;
                        padding-right: 0;
                    }
                }
            }
        }
        // To avoid some overlapping we set the FullCalendar More popover to a lower value
        .fc-more-popover {
            z-index: $zindex-modal-backdrop - 1;
        }
    }
}

.o_calendar_renderer .fc-view {
    .fc-event:not(.o_event_dot):not(.fc-dragging) {
        &.o_cw_custom_highlight, &.o_calendar_popover_open {
            box-shadow: 0px 8px 2px -7px rgba(0, 0, 0, 0.5);
            z-index: 2; // for the shadow to go over the events below
        }
    }
}


// ===============  Generate color classes ===============
@for $i from 1 through length($o-colors-complete) {
    $color: nth($o-colors-complete, $i);
    $color-subtle: mix($o-white, $color, 55%);

    .o_calendar_renderer {
        .o_calendar_color_#{$i - 1} {
            --fc-event-bg-color: #{$color-subtle};
            --o-event-bg: #{$color};
            --o-event-bg--subtle-rgb: #{to-rgb($color-subtle)};

            &.fc-bg-event {
                --fc-bg-event-color: #{$color-subtle};
            }

            &.o_event_hatched:has(.fc-bg), &.o_attendee_status_tentative:has(.fc-bg) {
                --fc-event-bg-color: #{$o-view-background-color};
            }
            &.o_event_hatched:not(.o_event_dot):not(.fc-daygrid-event):not(.fc-timegrid-event), &.o_event_hatched .fc-bg, &.o_attendee_status_tentative:not(.o_event_dot) .fc-bg {
                background: repeating-linear-gradient(
                    45deg,
                    RGBA(to-rgb($color), .3),
                    RGBA(to-rgb($color), .3) 10px,
                    RGBA(to-rgb($color), .6) 10px,
                    RGBA(to-rgb($color), .6) 20px
                ) !important;
            }

            &.o_event_striked:not(.o_event_dot) {
                background: linear-gradient(
                    transparent 0 45%,
                    $color 45% 55%,
                    transparent 55% 100%);
            }

            &.fc-event:not(.o_event_dot):not(.fc-dragging) {
                --fc-event-text-color: #{color-contrast($color-subtle)};
                --fc-event-border-color: #{tint-color($color, 50%)};
            }

            &.o_event_dot {
                background-color: rgba(var(--o-event-bg--subtle-rgb), var(--o-bg-opacity));

                &:before {
                    color: var(--o-event-bg, #{$info});
                }
            }
        }

        &:has(.fc-dayGridYear-view){
            border-right: $border-width solid $border-color;
        }
    }

    .o_cw_filter_color_#{$i - 1} {
        &.form-check:hover .o_cw_filter_input_bg:not(.no_filter_color) {
            border-color: shade-color($color, 20%);
        }

        .o_cw_filter_input_bg {
            border-color: $color;

            &:checked {
                background-color: $color;
            }
        }
    }
}

.fc-day.o-highlight {
    background-color: var(--fc-highlight-color) !important;
    &.fc-day-disabled {
        background-image: repeating-linear-gradient(-45deg, transparent, var(--fc-neutral-bg-color) 25px, transparent 50px);
    }
}