/* ==========================================================================
   TTrial — main.css
   Design tokens, base typography, layout primitives and every component /
   section style used by the theme. Mobile-first: base rules target the
   smallest viewport, min-width media queries layer up at 640 / 900 / 1200.
   No CSS framework — every selector below is hand-written for this theme.
   ========================================================================== */

/* --------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------- */
:root {
	/* Colour */
	--color-ink: #1c1b18;
	--color-ink-soft: #4a4842;
	--color-paper: #f8f7f3;
	--color-paper-raised: #ffffff;
	--color-border: #e3e1d9;
	--color-accent: #1f4b3f;
	--color-accent-soft: #e8eeea;
	--color-accent-hover: #163a31;

	/* Type */
	--font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
	--font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--font-meta: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

	--text-display-xl: clamp(2.75rem, 2.1rem + 3vw, 4.5rem);
	--text-display-lg: clamp(2rem, 1.7rem + 1.5vw, 3rem);
	--text-display-md: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
	--text-body-lg: 1.1875rem;
	--text-body: 1rem;
	--text-meta: 0.8125rem;

	/* Spacing (4px base unit) */
	--space-1: 0.25rem;
	--space-2: 0.5rem;
	--space-3: 0.75rem;
	--space-4: 1rem;
	--space-6: 1.5rem;
	--space-8: 2rem;
	--space-10: 2.5rem;
	--space-12: 3rem;
	--space-16: 4rem;
	--space-20: 5rem;

	/* Layout */
	--container-width: 1240px;
	--radius: 6px;
	--shadow-card: 0 1px 2px rgba(28, 27, 24, 0.04), 0 4px 12px rgba(28, 27, 24, 0.06);
}

/* --------------------------------------------------------------------
   2. Base typography
   -------------------------------------------------------------------- */
body {
	font-family: var(--font-body);
	font-size: var(--text-body);
	line-height: 1.5;
	color: var(--color-ink);
	background-color: var(--color-paper);
}

h1,
h2,
h3 {
	font-family: var(--font-display);
	line-height: 1.15;
	font-weight: 600;
	margin: 0 0 var(--space-4);
}

p {
	margin: 0 0 var(--space-4);
	color: var(--color-ink-soft);
}

.eyebrow {
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--color-accent);
	margin: 0 0 var(--space-2);
}

.section-heading {
	font-size: var(--text-display-lg);
	margin-bottom: var(--space-6);
}

/* --------------------------------------------------------------------
   3. Layout primitives
   -------------------------------------------------------------------- */
.section-inner {
	max-width: var(--container-width);
	margin-inline: auto;
	padding: var(--space-16) var(--space-6);
}

.section-inner--narrow {
	max-width: 760px;
}

/* --------------------------------------------------------------------
   4. Buttons
   -------------------------------------------------------------------- */
.button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-family: var(--font-body);
	font-weight: 600;
	font-size: var(--text-body);
	padding: 0.75em 1.5em;
	border-radius: var(--radius);
	border: 1px solid transparent;
	transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
	min-height: 48px;
}

.button--filled {
	background-color: var(--color-accent);
	color: var(--color-paper-raised);
}

.button--filled:hover,
.button--filled:focus-visible {
	background-color: var(--color-accent-hover);
}

.button--outline {
	background-color: transparent;
	border-color: var(--color-ink);
	color: var(--color-ink);
}

.button--outline:hover,
.button--outline:focus-visible {
	border-color: var(--color-accent);
	color: var(--color-accent);
}

.button--on-dark.button--filled {
	background-color: var(--color-paper-raised);
	color: var(--color-ink);
}

.button--on-dark.button--filled:hover,
.button--on-dark.button--filled:focus-visible {
	background-color: var(--color-accent-soft);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
	outline: 2px solid var(--color-accent);
	outline-offset: 2px;
}

/* --------------------------------------------------------------------
   5. Site header
   -------------------------------------------------------------------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background-color: var(--color-paper-raised);
	border-bottom: 1px solid var(--color-border);
	transition: box-shadow 150ms ease, padding 150ms ease;
}

.site-header.is-scrolled {
	box-shadow: var(--shadow-card);
}

.site-header__inner {
	max-width: var(--container-width);
	margin-inline: auto;
	padding: var(--space-4) var(--space-6);
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-4);
}

.site-header__mark-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	color: var(--color-ink);
}

.ttrial-mark {
	color: var(--color-accent);
	flex-shrink: 0;
}

.site-header__site-title {
	font-family: var(--font-display);
	font-size: 1.25rem;
	font-weight: 600;
}

.site-header__toggle {
	display: flex;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 44px;
	height: 44px;
	padding: 0;
}

.site-header__toggle-bar {
	display: block;
	width: 22px;
	height: 2px;
	background-color: var(--color-ink);
}

.site-header__nav {
	display: none;
}

.primary-menu {
	display: flex;
	align-items: center;
	gap: var(--space-6);
	font-size: 0.9375rem;
	font-weight: 500;
}

.primary-menu a {
	position: relative;
}

.primary-menu a:hover,
.primary-menu a:focus-visible {
	color: var(--color-accent);
}

.site-header__cta {
	margin-left: var(--space-2);
}

@media (min-width: 900px) {
	.site-header__toggle {
		display: none;
	}

	.site-header__nav {
		display: flex;
		align-items: center;
		gap: var(--space-8);
	}
}

@media (max-width: 899px) {
	.site-header__nav {
		position: fixed;
		inset: 0 0 0 auto;
		width: min(320px, 85vw);
		height: 100vh;
		background-color: var(--color-ink);
		padding: var(--space-20) var(--space-6) var(--space-6);
		flex-direction: column;
		align-items: flex-start;
		gap: var(--space-8);
		transform: translateX(100%);
		transition: transform 200ms ease;
	}

	.site-header__nav.is-open {
		display: flex;
		transform: translateX(0);
	}

	.primary-menu {
		flex-direction: column;
		align-items: flex-start;
		gap: var(--space-4);
		color: var(--color-paper);
	}

	body.nav-open {
		overflow: hidden;
	}
}

/* --------------------------------------------------------------------
   6. Hero
   -------------------------------------------------------------------- */
.hero__inner {
	max-width: var(--container-width);
	margin-inline: auto;
	padding: var(--space-20) var(--space-6) var(--space-16);
	display: grid;
	gap: var(--space-10);
	align-items: center;
}

.hero__heading {
	font-size: var(--text-display-xl);
	margin-bottom: var(--space-6);
}

.hero__copy {
	font-size: var(--text-body-lg);
	max-width: 60ch;
}

.hero__actions {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-4);
	margin-top: var(--space-6);
}

.hero__figure {
	display: none;
	color: var(--color-accent);
	justify-self: center;
}

@media (min-width: 900px) {
	.hero__inner {
		grid-template-columns: 7fr 5fr;
	}

	.hero__figure {
		display: block;
	}
}

/* --------------------------------------------------------------------
   7. Featured categories
   -------------------------------------------------------------------- */
.categories {
	background-color: var(--color-paper-raised);
	border-top: 1px solid var(--color-border);
	border-bottom: 1px solid var(--color-border);
}

.category-grid {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: var(--space-4);
}

.category-card a {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
	padding: var(--space-6);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	height: 100%;
	transition: border-color 150ms ease, box-shadow 150ms ease;
}

.category-card a:hover,
.category-card a:focus-visible {
	border-color: var(--color-accent);
	box-shadow: var(--shadow-card);
}

.category-card__name {
	font-family: var(--font-display);
	font-size: 1.125rem;
	font-weight: 600;
}

.category-card__count {
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	color: var(--color-ink-soft);
}

@media (min-width: 640px) {
	.category-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

@media (min-width: 1200px) {
	.category-grid {
		grid-template-columns: repeat(5, 1fr);
	}
}

/* --------------------------------------------------------------------
   8. Why TTrial
   -------------------------------------------------------------------- */
.why-ttrial__grid {
	display: grid;
	gap: var(--space-8);
}

.benefit-list__item {
	display: flex;
	gap: var(--space-4);
	padding: var(--space-6) 0;
	border-top: 1px solid var(--color-border);
}

.benefit-list__item:last-child {
	border-bottom: 1px solid var(--color-border);
}

.benefit-list__index {
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	color: var(--color-accent);
	flex-shrink: 0;
	padding-top: 0.2em;
}

.benefit-list__item h3 {
	font-size: 1.125rem;
	margin-bottom: var(--space-1);
}

.benefit-list__item p {
	margin-bottom: 0;
}

@media (min-width: 900px) {
	.why-ttrial__grid {
		grid-template-columns: 4fr 8fr;
	}
}

/* --------------------------------------------------------------------
   9. How It Works
   -------------------------------------------------------------------- */
.steps {
	display: grid;
	gap: var(--space-8);
	counter-reset: none;
	position: relative;
}

.steps__item {
	padding-top: var(--space-6);
	border-top: 1px solid var(--color-border);
}

.steps__index {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	color: var(--color-accent);
	margin-bottom: var(--space-3);
}

.steps__index--mark {
	color: var(--color-accent);
}

.steps__item h3 {
	font-size: 1.125rem;
	margin-bottom: var(--space-1);
}

.steps__item p {
	margin-bottom: 0;
}

@media (min-width: 900px) {
	.steps {
		grid-template-columns: repeat(4, 1fr);
	}
}

/* --------------------------------------------------------------------
   10. Latest articles
   -------------------------------------------------------------------- */
.latest-articles {
	background-color: var(--color-paper-raised);
	border-top: 1px solid var(--color-border);
	border-bottom: 1px solid var(--color-border);
}

.article-grid {
	display: grid;
	gap: var(--space-8);
}

.article-card {
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	overflow: hidden;
	display: flex;
	flex-direction: column;
	transition: border-color 150ms ease, box-shadow 150ms ease;
}

.article-card:hover,
.article-card:focus-within {
	border-color: var(--color-accent);
	box-shadow: var(--shadow-card);
}

.article-card__media {
	display: block;
	aspect-ratio: 3 / 2;
	overflow: hidden;
	background-color: var(--color-accent-soft);
}

.article-card__media img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.article-card__body {
	padding: var(--space-6);
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
}

.article-card__category {
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--color-accent);
}

.article-card__title {
	font-size: 1.25rem;
	margin-bottom: 0;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
}

.article-card__title a:hover,
.article-card__title a:focus-visible {
	text-decoration: underline;
	text-decoration-color: var(--color-accent);
}

.article-card__excerpt {
	font-size: 0.9375rem;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
	margin-bottom: 0;
}

.article-card__meta {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	color: var(--color-ink-soft);
}

.article-card__meta .ttrial-mark {
	color: var(--color-ink-soft);
}

.article-card__link {
	font-weight: 600;
	color: var(--color-accent);
	margin-top: var(--space-2);
}

.latest-articles__footer {
	margin-top: var(--space-10);
	text-align: center;
}

@media (min-width: 640px) {
	.article-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 1200px) {
	.article-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

/* --------------------------------------------------------------------
   11. Editorial standards
   -------------------------------------------------------------------- */
.editorial-standards {
	background-color: var(--color-accent-soft);
}

.editorial-standards__intro {
	max-width: 60ch;
}

.standards-grid {
	display: grid;
	gap: var(--space-6);
	margin-top: var(--space-8);
}

.standards-grid h3 {
	font-size: 1.0625rem;
	margin-bottom: var(--space-1);
}

.standards-grid p {
	margin-bottom: 0;
}

@media (min-width: 640px) {
	.standards-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 1200px) {
	.standards-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

/* --------------------------------------------------------------------
   12. FAQ
   -------------------------------------------------------------------- */
.faq-list {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
}

.faq-item {
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	padding: var(--space-4) var(--space-6);
	background-color: var(--color-paper-raised);
}

.faq-item summary {
	font-family: var(--font-meta);
	font-size: 0.9375rem;
	font-weight: 600;
	cursor: pointer;
	list-style: none;
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: var(--space-4);
}

.faq-item summary::-webkit-details-marker {
	display: none;
}

.faq-item summary::after {
	content: '+';
	font-family: var(--font-body);
	font-size: 1.25rem;
	color: var(--color-accent);
	flex-shrink: 0;
}

.faq-item[open] summary::after {
	content: '\2212';
}

.faq-item p {
	margin-top: var(--space-3);
	margin-bottom: 0;
}

/* --------------------------------------------------------------------
   13. Final CTA
   -------------------------------------------------------------------- */
.final-cta {
	background-color: var(--color-ink);
}

.final-cta__inner {
	text-align: center;
}

.final-cta__heading {
	color: var(--color-paper);
	font-size: var(--text-display-lg);
	margin-bottom: var(--space-8);
}

/* --------------------------------------------------------------------
   14. Site footer
   -------------------------------------------------------------------- */
.site-footer {
	background-color: var(--color-ink);
	color: var(--color-paper);
}

.site-footer__inner {
	max-width: var(--container-width);
	margin-inline: auto;
	padding: var(--space-16) var(--space-6) var(--space-10);
	display: grid;
	gap: var(--space-10);
}

.site-footer__mark-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	color: var(--color-paper);
	margin-bottom: var(--space-3);
}

.site-footer__mark-link .ttrial-mark {
	color: var(--color-paper);
}

.site-footer__site-title {
	font-family: var(--font-display);
	font-size: 1.125rem;
	font-weight: 600;
}

.site-footer__tagline {
	color: rgba(248, 247, 243, 0.7);
	font-size: 0.9375rem;
	max-width: 32ch;
	margin-bottom: 0;
}

.site-footer__heading {
	font-family: var(--font-meta);
	font-size: var(--text-meta);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: rgba(248, 247, 243, 0.6);
	margin-bottom: var(--space-4);
}

.site-footer__menu {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	font-size: 0.9375rem;
}

.site-footer__menu a:hover,
.site-footer__menu a:focus-visible {
	color: var(--color-paper);
	text-decoration: underline;
}

.site-footer__bottom {
	border-top: 1px solid rgba(248, 247, 243, 0.15);
	padding: var(--space-6);
	text-align: center;
	font-size: 0.8125rem;
	color: rgba(248, 247, 243, 0.6);
}

@media (min-width: 900px) {
	.site-footer__inner {
		grid-template-columns: 2fr 1fr 1fr 1fr;
	}
}