numix-gtk-theme/gtk-3.0/scss/widgets/_notebook.scss

@import "button";


/**********
 ! Notebook
***********/

@include exports("notebook") {
    .notebook {
        padding: 0;
        border-width: 1px 0 0;
        border-style: solid;
        border-color: border_normal($base_color);
        border-radius: 0;
        @include linear-gradient($base_color);
        background-clip: border-box;
        color: $text_color;

        -GtkNotebook-initial-gap: 0;
        -GtkNotebook-arrow-spacing: 5;
        -GtkNotebook-tab-curvature: 0;
        -GtkNotebook-tab-overlap: 1;
        -GtkNotebook-has-tab-gap: false;

        &.frame { border-width: 1px; }

        &.header {
            border-width: 0;
            background-color: shade($base_color, .9);

            &.frame {
                border-color: border_normal($base_color);

                &.top { border-width: 1px 1px 0 1px; }

                &.right { border-width: 1px 1px 1px 0; }

                &.bottom { border-width: 0 1px 1px 1px; }

                &.left { border-width: 1px 0 1px 1px; }
            }
        }

        GtkViewport {
            border-width: 0;
            background-color: $base_color;
            color: $text_color;
        }

        tab {
            padding: ($spacing + 1px) $spacing * 2;
            border: 1px solid transparent;
            background-color: transparent;
            background-image: none;

            &:active {
                background-color: transparent;
                background-image: none;
            }

            &.top {
                border-bottom-width: 2px;
                border-bottom-right-radius: 0;
                border-bottom-left-radius: 0;

                &:hover {
                    border-bottom-color: alpha($selected_bg_color, 0.3);
                }

                &:active {
                    border-bottom-color: $selected_bg_color;
                }
            }

            &.right {
                border-left-width: 2px;
                border-bottom-left-radius: 0;
                border-top-left-radius: 0;

                &:hover {
                    border-left-color: alpha($selected_bg_color, 0.3);
                }

                &:active {
                    border-left-color: $selected_bg_color;
                }                
            }

            &.bottom {
                border-top-width: 2px;
                border-top-right-radius: 0;
                border-top-left-radius: 0;

                &:hover {
                    border-top-color: alpha($selected_bg_color, 0.3);
                }

                &:active {
                    border-top-color: $selected_bg_color;
                }                
            }

            &.left {
                border-right-width: 2px;
                border-top-right-radius: 0;
                border-bottom-right-radius: 0;

                &:hover {
                    border-right-color: alpha($selected_bg_color, 0.3);
                }

                &:active {
                    border-right-color: $selected_bg_color;
                }
            }

            GtkLabel { color: mix($text_color, $base_color, .3); }

            &.reorderable-page {
                &:hover {
                    background-color: shade($base_color, .85);
                    border-left: 0;
                    border-right: 0;
                    /* using box shadows instead of borders due to slanted edges */
                    box-shadow: inset 0 3px alpha($black, .03), inset 0 2px alpha($black, .03), inset 0 1px alpha($black, .03), inset 1px 0 shade($base_color, .7), inset -1px 0 shade($base_color, .7);
                }

                &:active {
                    background-color: shade($base_color, .9);
                    border-left: 0;
                    border-right: 0;
                    box-shadow: inset 0 3px alpha($black, .03), inset 0 2px alpha($black, .03), inset 0 1px alpha($black, .03), inset 1px 0 shade($base_color, .75), inset -1px 0 shade($base_color, .75);
                }
            }              

            /* close button styling */
            .button { @extend %close_button; }

        }

        .prelight-page {
            &, GtkLabel { color: mix($text_color, $base_color, .15); }
        }

        .active-page {
            &, GtkLabel { color: $text_color; }
        }

    }
}