/**
 * Phase 22 — Past Papers Hub
 * Deep indigo/slate accent (distinct from Notes Hub green).
 */

.ig-past-papers-hub {
	--pp-ink: var(--ig-color-text, #0f172a);
	--pp-muted: var(--ig-color-text-muted, #64748b);
	--pp-line: color-mix(in srgb, var(--ig-color-border, #e2e8f0) 88%, transparent);
	--pp-surface: var(--ig-color-bg, #ffffff);
	--pp-soft: var(--ig-color-bg-light, #f1f5f9);
	--pp-accent: #4338ca;
	--pp-accent-deep: #312e81;
	--pp-radius: 1rem;
	--pp-ease: cubic-bezier(0.22, 1, 0.36, 1);
	overflow-x: clip;
	background: var(--pp-surface);
	color: var(--pp-ink);
}

.ig-past-papers-hub .ig-home-section {
	padding-block: clamp(3rem, 2.4rem + 2vw, 5rem);
}

.ig-past-papers-hub .ig-home-section--tint {
	background: var(--pp-soft);
}

.ig-past-papers-hub .ig-home-head {
	margin-bottom: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
	max-width: 40rem;
}

.ig-past-papers-hub .ig-home-head--center {
	margin-inline: auto;
	text-align: center;
}

/* Hero — deep indigo / slate */
.ig-pp-hero {
	position: relative;
	isolation: isolate;
	padding: clamp(3rem, 2.4rem + 2.5vw, 5rem) 0 clamp(3.5rem, 2.8rem + 2vw, 5.5rem);
	background:
		linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 42%),
		linear-gradient(150deg, #1e1b4b 0%, #312e81 45%, #334155 100%);
	color: #fff;
	overflow: hidden;
}

.ig-pp-hero__bg {
	position: absolute;
	inset: 0;
	z-index: 0;
	pointer-events: none;
	background:
		radial-gradient(55% 45% at 88% 12%, rgba(129, 140, 248, 0.28), transparent 60%),
		radial-gradient(40% 35% at 8% 80%, rgba(148, 163, 184, 0.16), transparent 55%);
}

.ig-pp-hero .ig-container {
	position: relative;
	z-index: 1;
}

.ig-pp-hero__inner {
	max-width: 40rem;
}

.ig-pp-hero__eyebrow {
	margin: 0 0 0.65rem;
	font-size: 0.72rem;
	font-weight: 650;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	opacity: 0.85;
}

.ig-pp-hero__title {
	margin: 0 0 0.85rem;
	font-size: clamp(2rem, 1.55rem + 2vw, 3rem);
	font-weight: 750;
	letter-spacing: -0.03em;
	line-height: 1.12;
}

.ig-pp-hero__text {
	margin: 0;
	font-size: 1.05rem;
	line-height: 1.55;
	opacity: 0.92;
	max-width: 36rem;
}

.ig-pp-hero__crumbs {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem;
	align-items: center;
	margin: 0 0 1.25rem;
	font-size: 0.88rem;
	opacity: 0.9;
}

.ig-pp-hero__crumbs a {
	color: inherit;
	text-decoration: underline;
	text-underline-offset: 0.15em;
}

.ig-pp-hero__crumbs a:hover {
	opacity: 1;
}

/* Filters */
.ig-pp-filters {
	max-width: 56rem;
	margin-inline: auto;
	padding: 1.25rem;
	border: 1px solid var(--pp-line);
	border-radius: var(--pp-radius);
	background: var(--pp-surface);
	box-shadow: var(--ig-shadow-sm, 0 1px 2px rgba(15, 23, 42, 0.06));
}

.ig-pp-filters__grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
	gap: 0.85rem;
}

.ig-pp-field {
	display: flex;
	flex-direction: column;
	gap: 0.35rem;
}

.ig-pp-field--grow {
	grid-column: 1 / -1;
}

.ig-pp-field__label {
	font-size: 0.78rem;
	font-weight: 600;
	color: var(--pp-muted);
}

.ig-pp-field select,
.ig-pp-field input {
	width: 100%;
	min-height: 2.6rem;
	padding: 0.45rem 0.7rem;
	border: 1px solid var(--pp-line);
	border-radius: 0.65rem;
	background: var(--pp-soft);
	color: var(--pp-ink);
	font: inherit;
}

.ig-pp-filters__actions {
	margin-top: 1rem;
	display: flex;
	justify-content: flex-end;
}

/* Cards / chips */
.ig-pp-card-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr));
	gap: 1rem;
}

.ig-pp-card {
	display: flex;
	flex-direction: column;
	gap: 0.45rem;
	padding: 1.15rem 1.2rem 1.25rem;
	border: 1px solid var(--pp-line);
	border-radius: var(--pp-radius);
	background: var(--pp-surface);
	text-decoration: none;
	color: inherit;
	transition: transform 0.25s var(--pp-ease), border-color 0.25s var(--pp-ease), box-shadow 0.25s var(--pp-ease);
}

.ig-pp-card:hover {
	transform: translateY(-2px);
	border-color: color-mix(in srgb, var(--pp-accent) 35%, var(--pp-line));
	box-shadow: 0 10px 28px rgba(49, 46, 129, 0.1);
}

.ig-pp-card__mono {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 2.5rem;
	height: 2.5rem;
	border-radius: 0.75rem;
	background: color-mix(in srgb, var(--pp-accent) 12%, transparent);
	color: var(--pp-accent);
	font-weight: 750;
	font-size: 0.85rem;
}

.ig-pp-card__meta {
	font-size: 0.78rem;
	color: var(--pp-muted);
	font-weight: 600;
}

.ig-pp-card__title {
	margin: 0;
	font-size: 1.1rem;
	letter-spacing: -0.02em;
}

.ig-pp-card__text {
	margin: 0;
	font-size: 0.92rem;
	line-height: 1.45;
	color: var(--pp-muted);
}

.ig-pp-chip-grid {
	display: flex;
	flex-wrap: wrap;
	gap: 0.55rem;
}

.ig-pp-chip {
	display: inline-flex;
	align-items: center;
	padding: 0.45rem 0.85rem;
	border-radius: 999px;
	border: 1px solid var(--pp-line);
	background: var(--pp-surface);
	color: var(--pp-ink);
	text-decoration: none;
	font-size: 0.9rem;
	font-weight: 600;
	transition: background 0.2s var(--pp-ease), border-color 0.2s var(--pp-ease);
}

.ig-pp-chip:hover {
	border-color: color-mix(in srgb, var(--pp-accent) 40%, var(--pp-line));
	background: color-mix(in srgb, var(--pp-accent) 8%, var(--pp-surface));
}

.ig-pp-paper-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
	gap: 1rem;
}

.ig-pp-paper-card {
	border: 1px solid var(--pp-line);
	border-radius: var(--pp-radius);
	background: var(--pp-surface);
	transition: border-color 0.2s var(--pp-ease), box-shadow 0.2s var(--pp-ease);
}

.ig-pp-paper-card:hover {
	border-color: color-mix(in srgb, var(--pp-accent) 30%, var(--pp-line));
	box-shadow: 0 8px 24px rgba(49, 46, 129, 0.08);
}

.ig-pp-paper-card__link {
	display: block;
	padding: 1.1rem 1.15rem 1.2rem;
	text-decoration: none;
	color: inherit;
}

.ig-pp-paper-card__meta {
	margin: 0 0 0.35rem;
	font-size: 0.78rem;
	color: var(--pp-muted);
	font-weight: 600;
}

.ig-pp-paper-card__title {
	margin: 0 0 0.4rem;
	font-size: 1.05rem;
	letter-spacing: -0.02em;
}

.ig-pp-paper-card__badge {
	display: inline-flex;
	align-items: center;
	margin: 0 0 0.45rem;
	padding: 0.2rem 0.55rem;
	border-radius: 0.4rem;
	font-size: 0.72rem;
	font-weight: 650;
	letter-spacing: 0.02em;
	background: color-mix(in srgb, var(--pp-accent) 12%, transparent);
	color: var(--pp-accent-deep);
}

.ig-pp-paper-card__badge--solved {
	background: color-mix(in srgb, #059669 14%, transparent);
	color: #047857;
}

.ig-pp-paper-card__badge--unsolved {
	background: color-mix(in srgb, #64748b 16%, transparent);
	color: #475569;
}

.ig-pp-paper-card__excerpt {
	margin: 0;
	font-size: 0.9rem;
	line-height: 1.45;
	color: var(--pp-muted);
}

.ig-pp-empty {
	color: var(--pp-muted);
	margin: 0;
}

/* FAQ */
.ig-pp-faq {
	max-width: 42rem;
	margin-inline: auto;
	display: grid;
	gap: 0.65rem;
}

.ig-pp-faq__item {
	border: 1px solid var(--pp-line);
	border-radius: 0.85rem;
	background: var(--pp-surface);
	padding: 0.85rem 1rem;
}

.ig-pp-faq__q {
	cursor: pointer;
	font-weight: 650;
	list-style: none;
}

.ig-pp-faq__q::-webkit-details-marker {
	display: none;
}

.ig-pp-faq__a {
	margin-top: 0.55rem;
	color: var(--pp-muted);
	font-size: 0.95rem;
	line-height: 1.55;
}

.ig-pp-faq__a p {
	margin: 0;
}

/* Related modules */
.ig-pp-related-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
	gap: 0.85rem;
}

.ig-pp-related {
	display: flex;
	flex-direction: column;
	gap: 0.3rem;
	padding: 1rem 1.05rem;
	border-radius: 0.85rem;
	border: 1px solid var(--pp-line);
	text-decoration: none;
	color: inherit;
	background: var(--pp-surface);
}

.ig-pp-related:hover {
	border-color: color-mix(in srgb, var(--pp-accent) 35%, var(--pp-line));
}

.ig-pp-related__label {
	font-size: 0.98rem;
}

.ig-pp-related__text {
	font-size: 0.85rem;
	color: var(--pp-muted);
}

.ig-pp-intro__card {
	max-width: 46rem;
	padding: 1.5rem 1.6rem;
	border-radius: var(--pp-radius);
	border: 1px solid var(--pp-line);
	background: var(--pp-soft);
}

.ig-pp-intro__title {
	margin: 0 0 0.65rem;
	font-size: 1.35rem;
	letter-spacing: -0.02em;
}

.ig-pp-intro__text,
.ig-pp-intro__note {
	margin: 0 0 0.75rem;
	color: var(--pp-muted);
	line-height: 1.55;
}

.ig-pp-intro__note {
	margin-bottom: 0;
	font-size: 0.92rem;
}

/* Single */
.ig-past-papers-hub--single {
	padding-bottom: 3rem;
}

.ig-pp-single-hero {
	padding: clamp(2.5rem, 2rem + 2vw, 4rem) 0 1.5rem;
	background: linear-gradient(180deg, var(--pp-soft), var(--pp-surface));
}

.ig-pp-single-hero .ig-pp-hero__crumbs {
	opacity: 1;
	color: var(--pp-muted);
}

.ig-pp-single-hero .ig-pp-hero__crumbs a {
	color: var(--pp-accent);
}

.ig-pp-single-hero__title {
	margin: 0.35rem 0 0.65rem;
	font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
	letter-spacing: -0.03em;
	line-height: 1.15;
}

.ig-pp-single-hero__text {
	margin: 0;
	max-width: 40rem;
	color: var(--pp-muted);
	line-height: 1.55;
}

.ig-pp-toolbar {
	position: sticky;
	top: 0;
	z-index: 20;
	border-block: 1px solid var(--pp-line);
	background: color-mix(in srgb, var(--pp-surface) 92%, transparent);
	backdrop-filter: blur(8px);
}

.ig-pp-toolbar__inner {
	display: flex;
	flex-wrap: wrap;
	gap: 0.55rem;
	padding-block: 0.75rem;
}

.ig-pp-meta-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr));
	gap: 0.85rem 1.25rem;
	margin: 0;
}

.ig-pp-meta-grid dt {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--pp-muted);
	font-weight: 650;
}

.ig-pp-meta-grid dd {
	margin: 0.2rem 0 0;
	font-weight: 600;
}

.ig-pp-single-meta,
.ig-pp-viewer,
.ig-pp-single-related,
.ig-pp-faq--single,
.ig-pp-report {
	padding-block: 1.75rem;
}

.ig-pp-section-title {
	margin: 0 0 1rem;
	font-size: 1.25rem;
	letter-spacing: -0.02em;
}

.ig-pp-viewer__body,
.ig-pp-viewer__preview {
	max-width: 46rem;
	line-height: 1.7;
}

.ig-pp-related-block {
	margin-bottom: 1.75rem;
}

.ig-pp-related-list {
	margin: 0;
	padding-left: 1.1rem;
	display: grid;
	gap: 0.35rem;
}

.ig-pp-refs {
	margin-top: 1.5rem;
	padding-top: 1.25rem;
	border-top: 1px solid var(--pp-line);
}

.ig-pp-refs__title {
	margin: 0 0 0.5rem;
	font-size: 1.05rem;
}

.ig-pp-report__inner {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	padding: 1.1rem 1.25rem;
	border-radius: var(--pp-radius);
	border: 1px dashed var(--pp-line);
	background: var(--pp-soft);
}

.ig-pp-report__inner p {
	margin: 0;
	font-weight: 600;
}

/* Buttons */
.ig-past-papers-hub .ig-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 2.5rem;
	padding: 0.45rem 1rem;
	border-radius: 0.65rem;
	font-weight: 650;
	font-size: 0.92rem;
	text-decoration: none;
	border: 1px solid transparent;
	cursor: pointer;
}

.ig-past-papers-hub .ig-btn--primary {
	background: var(--pp-accent);
	color: #fff;
}

.ig-past-papers-hub .ig-btn--primary:hover {
	background: var(--pp-accent-deep);
}

.ig-past-papers-hub .ig-btn--ghost {
	background: transparent;
	border-color: var(--pp-line);
	color: var(--pp-ink);
}

.ig-past-papers-hub .ig-btn--ghost:hover {
	border-color: color-mix(in srgb, var(--pp-accent) 40%, var(--pp-line));
	background: color-mix(in srgb, var(--pp-accent) 6%, var(--pp-surface));
}

/* Dark mode */
html[data-theme="dark"] .ig-past-papers-hub,
.ig-theme-dark .ig-past-papers-hub {
	--pp-surface: var(--ig-color-bg, #0b1220);
	--pp-soft: var(--ig-color-bg-light, #111827);
	--pp-ink: var(--ig-color-text, #e5e7eb);
	--pp-muted: var(--ig-color-text-muted, #94a3b8);
	--pp-line: color-mix(in srgb, var(--ig-color-border, #334155) 90%, transparent);
	--pp-accent: #818cf8;
	--pp-accent-deep: #a5b4fc;
}

html[data-theme="dark"] .ig-pp-paper-card__badge--solved,
.ig-theme-dark .ig-pp-paper-card__badge--solved {
	color: #34d399;
}

html[data-theme="dark"] .ig-pp-paper-card__badge--unsolved,
.ig-theme-dark .ig-pp-paper-card__badge--unsolved {
	color: #94a3b8;
}

@media print {
	.ig-pp-toolbar,
	.ig-pp-report,
	.ig-pp-single-related,
	.ig-site-header,
	.ig-site-footer,
	.site-header,
	.site-footer {
		display: none !important;
	}

	.ig-pp-print-area {
		color: #000;
	}
}

@media (max-width: 640px) {
	.ig-pp-filters__actions {
		justify-content: stretch;
	}

	.ig-pp-filters__actions .ig-btn {
		width: 100%;
	}

	.ig-pp-toolbar__inner {
		flex-direction: column;
	}

	.ig-pp-toolbar__inner .ig-btn {
		width: 100%;
	}
}

.ig-pp-viewer__embed {
	margin-top: 1.5rem;
	border: 1px solid var(--pp-line, #e2e8f0);
	border-radius: 0.85rem;
	overflow: hidden;
	background: var(--pp-soft, #f8fafc);
}

.ig-pp-viewer__iframe {
	display: block;
	width: 100%;
	min-height: min(70vh, 52rem);
	border: 0;
}