/**
 * components.css — shared UI chrome: logo, navigation, buttons, search,
 * cards, footer lists. Implements Phase 2 design system §8–§11, §13,
 * §20, §31.
 */

/* ---------- logo ---------- */

.fn-logo {
	font-weight: 800;
	font-size: 17px;
	letter-spacing: -0.01em;
	color: var(--fn-ink);
	text-decoration: none;
}

.custom-logo-link img {
	max-height: 40px;
	width: auto;
}

/* ---------- desktop navigation (§9) ---------- */

.fn-nav {
	display: flex;
	align-items: center;
	gap: var(--fn-space-6);
	list-style: none;
}

.fn-nav__item {
	position: relative;
}

.fn-nav__link {
	display: inline-block;
	padding: var(--fn-space-2) 0;
	font-size: var(--fn-fs-small);
	font-weight: 600;
	color: var(--fn-ink-2);
	text-decoration: none;
	border-bottom: 2px solid transparent;
}

.fn-nav__link:hover {
	color: var(--fn-ink);
}

.fn-nav__item--current > .fn-nav__link {
	color: var(--fn-ink);
	border-bottom-color: var(--fn-accent);
}

.fn-nav__toggle {
	background: none;
	border: none;
	padding: 2px 4px;
	color: var(--fn-ink-3);
}

.fn-nav__toggle[aria-expanded="true"] .fn-nav__chevron {
	transform: rotate(180deg);
	display: inline-block;
}

.fn-nav__submenu {
	list-style: none;
	position: absolute;
	top: 100%;
	left: 0;
	min-width: 200px;
	background: var(--fn-surface);
	border: 1px solid var(--fn-border);
	border-radius: var(--fn-radius-md);
	box-shadow: var(--fn-shadow-md);
	padding: var(--fn-space-2);
	margin-top: var(--fn-space-2);
}

.fn-nav__submenu .fn-nav__link {
	display: block;
	padding: var(--fn-space-2) var(--fn-space-3);
	border-radius: var(--fn-radius-sm);
	border-bottom: none;
}

.fn-nav__submenu .fn-nav__link:hover {
	background: var(--fn-surface-2);
}

/* ---------- buttons (§20) ---------- */

.fn-btn {
	font-family: var(--fn-font-sans);
	font-weight: 700;
	font-size: 14.5px;
	border-radius: var(--fn-radius-sm);
	padding: 11px 20px;
	border: 1.5px solid transparent;
	cursor: pointer;
	display: inline-flex;
	align-items: center;
	gap: var(--fn-space-2);
	text-decoration: none;
	transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
	min-height: 44px;
}

.fn-btn--primary {
	background: var(--fn-accent);
	color: #fff;
}

.fn-btn--primary:hover {
	background: var(--fn-accent-hover);
}

.fn-btn--secondary {
	background: transparent;
	color: var(--fn-accent-ink);
	border-color: var(--fn-border-strong);
}

.fn-btn--secondary:hover {
	border-color: var(--fn-accent);
	background: var(--fn-accent-soft);
}

.fn-btn--sm {
	padding: 8px 14px;
	font-size: 13px;
	min-height: 38px;
}

/* ---------- icon buttons / hamburger ---------- */

.fn-icon-btn {
	width: 40px;
	height: 40px;
	min-height: 0;
	border-radius: var(--fn-radius-sm);
	border: 1px solid var(--fn-border);
	background: var(--fn-surface);
	color: var(--fn-ink-2);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0;
}

.fn-icon-btn:hover {
	border-color: var(--fn-border-strong);
	color: var(--fn-ink);
}

.fn-hamburger {
	width: 40px;
	height: 40px;
	border-radius: var(--fn-radius-sm);
	border: 1px solid var(--fn-border);
	background: var(--fn-surface);
	display: inline-flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 4px;
	padding: 0;
}

.fn-hamburger__bar {
	display: block;
	width: 16px;
	height: 2px;
	background: var(--fn-ink-2);
	border-radius: 2px;
	transition: transform 0.15s ease, opacity 0.15s ease;
}

.fn-hamburger[aria-expanded="true"] .fn-hamburger__bar:nth-child(1) {
	transform: translateY(6px) rotate(45deg);
}

.fn-hamburger[aria-expanded="true"] .fn-hamburger__bar:nth-child(2) {
	opacity: 0;
}

.fn-hamburger[aria-expanded="true"] .fn-hamburger__bar:nth-child(3) {
	transform: translateY(-6px) rotate(-45deg);
}

/* ---------- search (§11) ---------- */

.fn-search-form {
	display: flex;
	align-items: center;
	gap: var(--fn-space-3);
	border: 1.5px solid var(--fn-border-strong);
	border-radius: var(--fn-radius-md);
	padding: 12px 16px;
	background: var(--fn-surface);
	color: var(--fn-ink-3);
}

.fn-search-form__input {
	flex: 1;
	border: none;
	outline: none;
	background: none;
	font-family: var(--fn-font-sans);
	font-size: 15px;
	color: var(--fn-ink);
	min-width: 0;
}

.fn-search-form__input::placeholder {
	color: var(--fn-ink-3);
}

.fn-search-overlay {
	position: fixed;
	inset: 0;
	z-index: 100;
	background: color-mix(in srgb, var(--fn-ink) 45%, transparent);
	display: flex;
	align-items: flex-start;
	justify-content: center;
	padding: var(--fn-space-7) var(--fn-space-4);
}

.fn-search-overlay[hidden] {
	display: none;
}

.fn-search-overlay__inner {
	position: relative;
	width: 100%;
	max-width: 560px;
	background: var(--fn-surface);
	border-radius: var(--fn-radius-lg);
	box-shadow: var(--fn-shadow-md);
	padding: var(--fn-space-6);
}

.fn-search-overlay__close {
	position: absolute;
	top: -14px;
	right: -14px;
	width: 32px;
	height: 32px;
	border-radius: 50%;
	border: 1px solid var(--fn-border);
	background: var(--fn-surface);
	color: var(--fn-ink-2);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0;
}

/* ---------- mobile menu drawer (§10) ---------- */

.fn-mobile-menu {
	position: fixed;
	inset: 0 0 0 auto;
	z-index: 90;
	width: 85%;
	max-width: 360px;
	background: var(--fn-surface);
	box-shadow: var(--fn-shadow-md);
	transform: translateX(100%);
	transition: transform 0.2s ease;
	overflow-y: auto;
}

.fn-mobile-menu--open {
	transform: translateX(0);
}

.fn-mobile-menu__inner {
	padding: var(--fn-space-6) var(--fn-space-5);
}

.fn-mobile-nav {
	list-style: none;
	display: flex;
	flex-direction: column;
	margin-top: var(--fn-space-5);
}

.fn-mobile-nav .fn-nav__item {
	border-top: 1px solid var(--fn-border);
}

.fn-mobile-nav .fn-nav__item:first-child {
	border-top: none;
}

.fn-mobile-nav .fn-nav__link {
	display: block;
	padding: 14px 2px;
	font-size: 15px;
	border-bottom: none;
}

.fn-mobile-nav .fn-nav__submenu {
	position: static;
	box-shadow: none;
	border: none;
	margin: 0 0 var(--fn-space-2);
	padding-left: var(--fn-space-4);
}

@media (min-width: 1024px) {
	.fn-mobile-menu,
	.fn-search-overlay {
		/* Both remain reachable at desktop widths (the search icon still
		   opens the overlay there); only the hamburger itself is hidden
		   via layout.css at this breakpoint. */
	}
}

/* ---------- cards (§13, §17) — discovery contexts only, never the
   article body itself (Phase 2 refinement #3) ---------- */

.fn-card {
	border: 1px solid var(--fn-border);
	border-radius: var(--fn-radius-md);
	background: var(--fn-surface);
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.fn-card:hover {
	border-color: var(--fn-border-strong);
	box-shadow: var(--fn-shadow-sm);
}

.fn-card__link {
	display: flex;
	flex-direction: column;
	gap: var(--fn-space-2);
	padding: var(--fn-space-4);
	text-decoration: none;
	color: inherit;
}

.fn-card__cat {
	font-size: 10.5px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--fn-accent-ink);
}

.fn-card__title {
	font-size: 15px;
	font-weight: 700;
	line-height: 1.35;
	color: var(--fn-ink);
}

.fn-card__excerpt {
	font-size: 13px;
	color: var(--fn-ink-2);
	line-height: 1.5;
	margin: 0;
}

.fn-card__meta {
	display: flex;
	gap: var(--fn-space-2);
	font-size: 11.5px;
	color: var(--fn-ink-3);
	margin-top: auto;
	padding-top: var(--fn-space-1);
}

/* ---------- card media (Phase 6) — optional; only present when a
   featured image exists, per the typography-first requirement ---------- */

.fn-card__media {
	display: block;
	border-radius: var(--fn-radius-sm);
	overflow: hidden;
}

.fn-card__media img {
	display: block;
	width: 100%;
	height: auto;
}

.fn-card__reading-time::after {
	content: "·";
	margin-left: var(--fn-space-2);
}

/* ---------- card variants (Phase 6) — same markup, spacing/scale only ---------- */

.fn-card--compact .fn-card__link {
	padding: var(--fn-space-3);
	gap: var(--fn-space-1);
}

.fn-card--compact .fn-card__title {
	font-size: 13.5px;
}

.fn-card--featured .fn-card__title {
	font-size: 18px;
}

.fn-card--featured .fn-card__excerpt {
	font-size: 14px;
}

/* ---------- footer lists ---------- */

.fn-footer__heading {
	font-size: 11px;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--fn-ink-3);
	font-weight: 700;
	margin-bottom: var(--fn-space-3);
}

.fn-footer__tagline {
	font-size: 12.5px;
	color: var(--fn-ink-2);
	max-width: 26ch;
	margin-top: var(--fn-space-2);
}

.fn-footer__list {
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: var(--fn-space-2);
}

.fn-footer__list a {
	font-size: 13px;
	color: var(--fn-ink-2);
	text-decoration: none;
}

.fn-footer__list a:hover {
	color: var(--fn-accent-ink);
}