/* ABOUTME: Shared frontend + editor-canvas styles for the Agenda Timeline blocks. */
/* ABOUTME: px-based sizing (immune to theme root-font rescaling); color tokens with static fallbacks, upgraded via @supports color-mix. */

.tdat-timeline {
	--tdat-accent: #0e4797;
	--tdat-highlight: #f9c53d;
	/* Static fallbacks matching the default accent — kept working in browsers without color-mix() */
	--tdat-rail: rgba( 14, 71, 151, 0.16 );
	--tdat-border: rgba( 14, 71, 151, 0.2 );
	--tdat-border-hover: rgba( 14, 71, 151, 0.45 );
	--tdat-tint: #f0f4f9;
	--tdat-tint-hover: #e0e7f1;
	--tdat-muted: #2f4e79;
	--tdat-glow: rgba( 14, 71, 151, 0.45 );
	--tdat-leader: rgba( 14, 71, 151, 0.28 );
	--tdat-divider: rgba( 14, 71, 151, 0.1 );
	--tdat-break-ring: rgba( 14, 71, 151, 0.35 );
	--tdat-break-dot: #7a9ac6;
	--tdat-group-ring: rgba( 249, 197, 61, 0.3 );
	--tdat-radius: 16px;
	interpolate-size: allow-keywords;
}

/* Modern browsers derive every tint from the (possibly customized) accent color */
@supports ( color: color-mix( in srgb, red 50%, white ) ) {

	.tdat-timeline {
		--tdat-rail: color-mix( in srgb, var( --tdat-accent ) 16%, transparent );
		--tdat-border: color-mix( in srgb, var( --tdat-accent ) 20%, transparent );
		--tdat-border-hover: color-mix( in srgb, var( --tdat-accent ) 45%, transparent );
		--tdat-tint: color-mix( in srgb, var( --tdat-accent ) 6%, #ffffff );
		--tdat-tint-hover: color-mix( in srgb, var( --tdat-accent ) 13%, #ffffff );
		--tdat-muted: color-mix( in srgb, var( --tdat-accent ) 45%, #4a5361 );
		--tdat-glow: color-mix( in srgb, var( --tdat-accent ) 45%, transparent );
		--tdat-leader: color-mix( in srgb, var( --tdat-accent ) 28%, transparent );
		--tdat-divider: color-mix( in srgb, var( --tdat-accent ) 10%, transparent );
		--tdat-break-ring: color-mix( in srgb, var( --tdat-accent ) 35%, transparent );
		--tdat-break-dot: color-mix( in srgb, var( --tdat-accent ) 55%, #ffffff );
		--tdat-group-ring: color-mix( in srgb, var( --tdat-highlight ) 30%, transparent );
	}
}

.tdat-timeline__list {
	list-style: none;
	margin: 0;
	padding: 0;
	position: relative;
}

/* The timeline rail, fading out at both ends */
.tdat-timeline__list::before {
	content: "";
	position: absolute;
	top: 8px;
	bottom: 8px;
	left: 10px;
	width: 3px;
	border-radius: 999px;
	background: var( --tdat-rail );
	mask-image: linear-gradient( to bottom, transparent, #000 48px, #000 calc( 100% - 48px ), transparent );
	-webkit-mask-image: linear-gradient( to bottom, transparent, #000 48px, #000 calc( 100% - 48px ), transparent );
}

.tdat-timeline__item {
	position: relative;
	margin: 0 0 32px; /* roomy between items, tight within one — grouping stays obvious while scrolling */
	padding-left: 40px;
	list-style: none; /* themes often re-add numbering on `.entry-content ol li` */
	scroll-margin-top: 140px; /* keep hash-linked items clear of sticky headers */
}

/* Belt and suspenders: some themes set numbering with higher specificity — kill the marker box itself */
.tdat-timeline__item::marker {
	content: none;
}

.tdat-timeline__item:last-child {
	margin-bottom: 0;
}

/* Timeline dot */
.tdat-timeline__marker {
	position: absolute;
	left: 0;
	top: 1px;
	width: 23px;
	height: 23px;
	border-radius: 50%;
	background: #ffffff;
	border: 5px solid var( --tdat-accent );
	box-sizing: border-box;
	z-index: 1;
	transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

/* Dot responds when its card is hovered */
.tdat-timeline__item:has( .tdat-timeline__summary:hover ) .tdat-timeline__marker {
	transform: scale( 1.12 );
}

.tdat-timeline__item.is-break .tdat-timeline__marker {
	width: 15px;
	height: 15px;
	left: 4px;
	top: 6px;
	border-width: 4px;
	border-color: var( --tdat-break-dot );
}

/* Time pill */
.tdat-timeline__time {
	margin: 0 0 6px;
	line-height: 1;
}

.tdat-timeline__time span {
	display: inline-block;
	background: var( --tdat-accent );
	color: #ffffff;
	font-weight: 700;
	font-size: 13px;
	letter-spacing: 0.03em;
	line-height: 1.3;
	max-width: 100%;
	text-align: center;
	font-variant-numeric: tabular-nums;
	padding: 5px 13px;
	border-radius: 999px;
	box-shadow: 0 2px 6px -2px var( --tdat-glow );
	transition: background-color 0.2s ease, color 0.2s ease;
}

.tdat-timeline__time.is-empty {
	display: none;
}

/* Item card */
.tdat-timeline__card {
	background: #ffffff;
	border: 1.5px solid var( --tdat-border );
	border-radius: var( --tdat-radius );
	box-shadow: 0 1px 2px rgba( 15, 35, 70, 0.06 );
	transition: border-color 0.2s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

.tdat-timeline__card:hover {
	border-color: var( --tdat-border-hover );
}

details.tdat-timeline__card:not( [open] ):hover {
	transform: translateY( -1px );
	box-shadow: 0 6px 18px -10px var( --tdat-glow );
}

details.tdat-timeline__card[open],
.tdat-timeline__card.is-static {
	box-shadow: 0 12px 32px -14px var( --tdat-glow );
}

.tdat-timeline__summary {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding: 17px 18px;
	cursor: pointer;
	list-style: none;
	-webkit-tap-highlight-color: transparent;
	border-radius: var( --tdat-radius );
}

.tdat-timeline__card.is-static .tdat-timeline__summary {
	cursor: default;
	padding-bottom: 6px;
}

.tdat-timeline__summary::-webkit-details-marker {
	display: none;
}

.tdat-timeline__summary::marker {
	content: "";
}

.tdat-timeline__summary:focus-visible {
	outline: 3px solid var( --tdat-accent );
	outline-offset: 2px;
}

/* Featured image thumb — leads the summary row; layout is identical without it */
.tdat-timeline__thumb {
	flex: none;
	width: 56px;
	height: 56px;
	border-radius: 12px;
	overflow: hidden;
	background: var( --tdat-tint );
	box-shadow: inset 0 0 0 1px var( --tdat-border );
}

.tdat-timeline__thumb .tdat-timeline__thumb-img,
.tdat-timeline__thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	border-radius: inherit;
	margin: 0;
}

/* Title + optional subtitle */
.tdat-timeline__heading {
	display: flex;
	flex-direction: column;
	gap: 5px;
	min-width: 0;
	flex: 1;
}

.tdat-timeline h3.tdat-timeline__title {
	margin: 0;
	padding: 0;
	font-size: clamp( 16px, 15px + 0.35vw, 19px );
	line-height: 1.35;
	color: var( --tdat-accent );
	font-weight: 700;
	text-wrap: pretty;
}

.tdat-timeline__subtitle {
	font-size: 14px;
	font-weight: 600;
	line-height: 1.45;
	color: var( --tdat-muted );
}

.tdat-timeline__subtitle a {
	color: var( --tdat-accent );
	text-decoration: underline;
	text-underline-offset: 2px;
}

/* Chevron */
.tdat-timeline__chevron {
	flex: none;
	display: grid;
	place-items: center;
	width: 36px;
	height: 36px;
	border-radius: 50%;
	color: var( --tdat-accent );
	background: var( --tdat-tint );
	transition: transform 0.25s ease, background-color 0.2s ease;
}

.tdat-timeline__summary:hover .tdat-timeline__chevron {
	background: var( --tdat-tint-hover );
}

details.tdat-timeline__card[open] > .tdat-timeline__summary .tdat-timeline__chevron {
	transform: rotate( 180deg );
	background: var( --tdat-highlight );
}

/* Soft divider between an open card's header and its body */
details.tdat-timeline__card[open] > .tdat-timeline__summary {
	box-shadow: inset 0 -1px 0 var( --tdat-divider );
}

details.tdat-timeline__card[open] > .tdat-timeline__body,
.tdat-timeline__card.is-static > .tdat-timeline__body {
	padding-top: 16px;
}

/* Open-state accents (screen only — print expands everything and shouldn't go all-gold) */
@media screen {

	.tdat-timeline__item:has( details[open] ) .tdat-timeline__time span {
		background: var( --tdat-highlight );
		color: var( --tdat-accent );
	}

	.tdat-timeline__item:has( details[open] ) .tdat-timeline__marker {
		background: var( --tdat-highlight );
	}
}

/* Card body (rich content) */
.tdat-timeline__body {
	padding: 2px 18px 21px;
}

.tdat-timeline__body > :first-child {
	margin-top: 0;
}

.tdat-timeline__body > :last-child {
	margin-bottom: 0;
}

.tdat-timeline__body p,
.tdat-timeline__body li {
	font-size: 15px;
	line-height: 1.65;
}

.tdat-timeline__body p {
	margin: 0 0 14px;
}

.tdat-timeline__body a {
	color: var( --tdat-accent );
	font-weight: 600;
	text-decoration: underline;
	text-underline-offset: 2px;
}

.tdat-timeline__body ul,
.tdat-timeline__body ol {
	padding-left: 22px;
	margin: 12px 0 14px;
}

.tdat-timeline__body li {
	margin-bottom: 6px;
}

/* Smooth open/close where supported (progressive enhancement) */
details.tdat-timeline__card::details-content {
	block-size: 0;
	overflow: clip;
	transition: block-size 0.3s ease, content-visibility 0.3s ease allow-discrete;
}

details.tdat-timeline__card[open]::details-content {
	block-size: auto;
}

/* Break / compact rows */
.tdat-timeline__item.is-break {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 6px 14px;
	padding-top: 2px;
	padding-bottom: 2px;
	margin-bottom: 32px;
}

.tdat-timeline__item.is-break .tdat-timeline__time {
	margin: 0;
}

.tdat-timeline__item.is-break .tdat-timeline__time span {
	background: transparent;
	color: var( --tdat-accent );
	box-shadow: inset 0 0 0 2px var( --tdat-break-ring );
}

.tdat-timeline__break-card {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	gap: 4px 14px;
	min-width: min( 100%, 190px );
	flex: 1;
}

/* Dotted leader line after break labels, filling the row */
.tdat-timeline__break-card::after {
	content: "";
	flex: 1 1 32px;
	min-width: 32px;
	align-self: center;
	border-top: 2px dotted var( --tdat-leader );
}

.tdat-timeline__item.is-break h3.tdat-timeline__title {
	font-size: 15px;
	font-weight: 600;
	color: var( --tdat-muted );
}

.tdat-timeline__item.is-break .tdat-timeline__body {
	flex-basis: 100%;
	padding: 0;
}

/* Group headings — labeled chapter dividers (agenda tracks, decades, days) */
.tdat-timeline__item.is-group {
	margin: 40px 0 26px;
}

.tdat-timeline__item.is-group:first-child {
	margin-top: 0;
}

.tdat-timeline__item.is-group .tdat-timeline__marker {
	width: 13px;
	height: 13px;
	left: 5px;
	top: 9px;
	background: var( --tdat-highlight );
	border: none;
	box-shadow: 0 0 0 4px var( --tdat-group-ring );
}

.tdat-timeline h3.tdat-timeline__group-chip {
	margin: 0;
	padding: 7px 18px;
	display: inline-block;
	background: var( --tdat-highlight );
	color: var( --tdat-accent );
	font-size: 13px;
	font-weight: 800;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	line-height: 1.3;
	border-radius: 999px;
}

.tdat-timeline__item.is-group .tdat-timeline__group-body {
	padding: 10px 0 0;
}

/* ---------- Wider screens: dedicated time column, centered rail ---------- */

@media ( min-width: 782px ) {

	.tdat-timeline {
		--tdat-timecol: 116px;
		--tdat-railcol: 48px;
	}

	.tdat-timeline__list::before {
		left: calc( var( --tdat-timecol ) + ( var( --tdat-railcol ) / 2 ) - 1.5px );
	}

	.tdat-timeline__item,
	.tdat-timeline__item.is-break {
		display: grid;
		grid-template-columns: var( --tdat-timecol ) var( --tdat-railcol ) minmax( 0, 1fr );
		gap: 0; /* cancel the mobile flex gap — it would push the break dot off the rail */
		align-items: start;
		padding-left: 0;
		margin-bottom: 26px;
	}

	.tdat-timeline__marker,
	.tdat-timeline__item.is-break .tdat-timeline__marker {
		position: static;
		grid-column: 2;
		grid-row: 1;
		justify-self: center;
	}

	.tdat-timeline__marker {
		margin-top: 8px;
	}

	.tdat-timeline__item.is-break .tdat-timeline__marker {
		margin-top: 7px;
	}

	.tdat-timeline__time {
		grid-column: 1;
		grid-row: 1;
		justify-self: end;
		text-align: right;
		margin: 0;
		padding-top: 5px;
	}

	.tdat-timeline__item.is-break .tdat-timeline__time {
		padding-top: 0;
		align-self: center;
	}

	.tdat-timeline__card,
	.tdat-timeline__break-card {
		grid-column: 3;
		grid-row: 1;
	}

	.tdat-timeline__item.is-group {
		margin: 34px 0 24px;
	}

	.tdat-timeline__item.is-group .tdat-timeline__marker {
		margin-top: 10px;
	}

	.tdat-timeline h3.tdat-timeline__group-chip {
		grid-column: 3;
		grid-row: 1;
		justify-self: start;
	}

	.tdat-timeline__item.is-group .tdat-timeline__group-body {
		grid-column: 3;
		grid-row: 2;
	}

	.tdat-timeline__item.is-break .tdat-timeline__break-card {
		align-self: center;
		padding-top: 2px;
	}

	.tdat-timeline__summary {
		padding: 18px 22px;
	}

	.tdat-timeline__thumb {
		width: 64px;
		height: 64px;
	}

	.tdat-timeline__body {
		padding: 2px 22px 23px;
	}

	.tdat-timeline__body p,
	.tdat-timeline__body li {
		font-size: 16px;
	}
}

/* ---------- Layout: center spine (alternating) ----------
   Opt-in via the block's Layout setting (adds .tdat-layout-spine).
   Wide screens only — below 782px (and in print) it inherits the
   default single-column rail layout above. */

@media screen and ( min-width: 782px ) {

	.tdat-timeline.tdat-layout-spine .tdat-timeline__list::before {
		left: 50%;
		margin-left: -1.5px;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item {
		display: block;
		position: relative;
		width: calc( 50% - 34px );
		margin: 0 0 10px;
		padding-left: 0;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item:nth-child( odd of .has-details ) {
		margin-left: auto;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item:nth-child( even of .has-details ) {
		margin-right: auto;
	}

	/* The year pill sits ON the spine and replaces the dot */
	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.has-details .tdat-timeline__marker {
		display: none;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.has-details .tdat-timeline__time {
		position: absolute;
		top: 12px;
		z-index: 2;
		margin: 0;
		padding: 0;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.has-details:nth-child( odd of .has-details ) .tdat-timeline__time {
		left: -34px;
		transform: translateX( -50% );
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.has-details:nth-child( even of .has-details ) .tdat-timeline__time {
		right: -34px;
		transform: translateX( 50% );
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.has-details .tdat-timeline__time span {
		border: 3px solid #ffffff;
	}

	/* Friendlier round thumbs suit the alternating cards */
	.tdat-timeline.tdat-layout-spine .tdat-timeline__thumb {
		width: 48px;
		height: 48px;
		border-radius: 50%;
	}

	/* Breaks and group headings become centered chapter markers across the spine */
	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break,
	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-group {
		display: flex;
		justify-content: center;
		align-items: center;
		gap: 12px;
		width: auto;
		margin: 28px 0;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break .tdat-timeline__marker,
	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-group .tdat-timeline__marker {
		display: none;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-group h3.tdat-timeline__group-chip {
		border: 3px solid #ffffff;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-group .tdat-timeline__group-body {
		flex-basis: 100%;
		text-align: center;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break .tdat-timeline__time {
		position: static;
		transform: none;
		margin: 0;
		padding: 0;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break .tdat-timeline__time span {
		background: var( --tdat-accent );
		color: #ffffff;
		box-shadow: 0 2px 6px -2px var( --tdat-glow );
		border: 3px solid #ffffff;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break .tdat-timeline__break-card {
		flex: none;
		min-width: 0;
	}

	.tdat-timeline.tdat-layout-spine .tdat-timeline__item.is-break .tdat-timeline__break-card::after {
		display: none;
	}
}

/* ---------- Motion + print ---------- */

@media ( prefers-reduced-motion: reduce ) {

	.tdat-timeline *,
	details.tdat-timeline__card::details-content {
		transition: none !important;
	}
}

@media print {

	.tdat-timeline__chevron {
		display: none;
	}

	.tdat-timeline__item {
		break-inside: avoid; /* keep pill + dot + card together across page breaks */
	}

	.tdat-timeline__card {
		box-shadow: none !important;
		break-inside: avoid;
	}
}