@import '../variables.less';
@import '../mixins.less';

@media screen {
	html {
		// Make ToC width accessible as CSS var
		--width-toc: @width-toc;
	}

	.toc {
		position: fixed;
		top: ~'calc( var( --height-header ) + 1.2rem )'; // align with .mw-body-header
		left: var( --padding-page );
		width: 100%;
		max-width: ~'calc( var( --width-toc ) - var( --padding-page ) * 2 )';
		color: var( --color-base--subtle );
		font-size: 0.875rem;

		&::-webkit-scrollbar {
			width: 0; // Hide bar on toc
		}

		&title {
			h2 {
				margin: 0;
				color: var( --color-base--subtle );
				font-size: inherit;
				font-weight: normal;
				letter-spacing: 0.75px;
			}
		}

		&toggle {
			&span {
				display: none;
			}

			&checkbox:checked ~ ul {
				display: block !important; // Force display
			}
		}

		li {
			border-left: 2px solid var( --border-color-base--darker );

			&.toclevel-2,
			&.toclevel-3,
			&.toclevel-4,
			&.toclevel-5,
			&.toclevel-6 {
				margin-left: 0.75rem;
			}
		}

		.toc__item--active {
			border-color: var( --color-primary );
			color: var( --color-primary );

			> a,
			> a:hover,
			> a:active {
				color: inherit;
			}
		}

		a {
			display: block;
			padding: 0.25rem 0 0.25rem 0.75rem;
			color: var( --color-base );

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

			&:active {
				color: var( --color-primary--active );
			}
		}

		&number {
			display: none;
			margin-right: 0.25rem;
			opacity: 0.7;
		}

		&text {
			font-weight: 500;
		}

		ul {
			list-style: none;
		}

		> ul {
			position: relative;
			z-index: 2;
			display: block;
			overflow: visible auto;
			max-height: ~'calc( 100vh - var( --height-header ) - 3rem )'; // Somehow it works
			padding-right: 0.75rem;
			margin: 0.6rem 0 0 0;
			font-weight: 450;
			overscroll-behavior: contain;

			ul {
				margin: 0;
			}
		}
	}

	@media ( max-width: @width-breakpoint-desktop-wide ) {
		.toc {
			z-index: 3; // Lower than header
			pointer-events: none;

			&toggle {
				&span {
					display: block;
					font-size: 0;
				}

				&label {
					--label-position: ~'calc( var( --width-toc ) - 20px )';
					position: fixed;
					left: var( --label-position );
					width: 2.5rem;
					height: 2.5rem;
					border-radius: 0 var( --border-radius--medium ) var( --border-radius--medium ) 0;
					cursor: pointer;
					pointer-events: auto;
					.citizen-card( false );

					&:hover {
						background-color: var( --color-surface-3 );

						&:before {
							opacity: var( --opacity-icon-base--hover );
						}
					}

					&:active {
						background-color: var( --color-surface-1 );

						&:before {
							opacity: var( --opacity-icon-base--active );
						}
					}

					&:before {
						.resource-loader-icon;
						display: block;
						background-size: 1rem;
						opacity: var( --opacity-icon-base );
					}
				}

				// By default .toccheckbox is checked on page load
				// This is needed to prevent ToC popping up on mobile
				&checkbox:not( :checked ) {
					~ .toctitle .toctogglelabel {
						transform: translateX( ~'calc( var( --label-position ) * -1 )' );
					}

					~ .toctitle h2,
					~ ul {
						transform: translateX( -120% );
					}
				}
			}

			&title h2 {
				position: absolute;
				z-index: 3;
				width: ~'calc( 100% - var( --padding-page ) * 2 )';
				padding: 1rem var( --padding-page );

				&:before {
					position: absolute;
					z-index: -1;
					top: 0;
					right: 0;
					left: 0;
					height: 100%;
					background: var( --color-surface-1 );
					border-radius: var( --border-radius--medium );
					content: '';
					-webkit-mask-image: linear-gradient( 180deg, #000, transparent );
					mask-image: linear-gradient( 180deg, #000, transparent );
				}
			}

			> ul {
				display: block !important; // So that animation is visible
				max-height: ~'calc( 100vh - var( --height-header ) * 3 )';
				padding: 2.6rem var( --padding-page ) 1rem var( --padding-page ); // hardcoded for now
				margin-top: 0;
				border-radius: var( --border-radius--medium ) 0 var( --border-radius--medium ) var( --border-radius--medium );
				pointer-events: auto;
				.citizen-card( false );
			}

			&togglelabel,
			&title h2,
			> ul {
				opacity: 0;
				transition: @transition-opacity;
				visibility: hidden;
			}
		}

		// Show toc button when title is hidden
		.citizen-title--hidden {
			.toc {
				&togglelabel,
				&title h2,
				> ul {
					opacity: 1;
					visibility: visible;
				}
			}
		}

		.citizen-animations-ready {
			.toc {
				&togglelabel,
				&title h2,
				> ul {
					transition: @transition-transform, @transition-opacity;
				}
			}
		}

		.skin-citizen-dark {
			.toc {
				&togglelabel {
					&:before {
						filter: invert( 1 );
					}
				}
			}
		}
	}

	@media ( max-width: @width-breakpoint-tablet ) {
		.toc {
			right: 0;

			> ul {
				max-height: 60vh;
			}
		}
	}

	@media ( max-width: @width-breakpoint-mobile ) {
		.toc {
			max-width: ~'calc(100vw - var( --padding-page ) * 2)';
		}
	}

	@media ( min-width: @width-breakpoint-desktop-wide ) {
		.citizen-toc-enabled {
			.mw-body-header,
			.citizen-body {
				margin-right: ~'max( var( --margin-layout ), 0 )';
				margin-left: ~'max( var( --margin-layout ), var( --width-toc ) )';
			}
		}
	}
}