/**
 * Variant CSS: newsletter--underline-field
 *
 * A quiet, editorial sign-up — kicker, oversized display headline, one deck
 * line, then an elegant sign-up line where the (visual-only) email field and
 * the button share a single underline rule, like a magazine subscription. No
 * box, no colour band (so contrast can't break across the 12 themes). Text
 * stays --ink (polarity-aware); the underline + button take --accent.
 */

body.aibt-universal .universal-newsletter--underline-field {
	padding-block: calc(clamp(3rem, 7vw, 5.5rem) * var(--density, 1));
	text-align: center;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__kicker {
	font-family: var(--font-body) !important;
	font-size: var(--text-xs) !important;
	font-weight: 600 !important;
	letter-spacing: var(--tracking-widest) !important;
	text-transform: uppercase !important;
	color: var(--accent) !important;
	margin: 0 auto var(--space-sm) auto !important;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__headline {
	font-family: var(--font-display) !important;
	color: var(--ink) !important;
	margin: 0 auto var(--space-md) auto !important;
	max-width: 16ch;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__headline em {
	color: var(--accent) !important;
	font-style: italic;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__deck {
	font-family: var(--font-body) !important;
	font-size: var(--text-base) !important;
	line-height: var(--leading-relaxed) !important;
	color: var(--ink) !important;
	opacity: 0.74;
	max-width: 48ch;
	margin: 0 auto var(--space-xl, 2.6rem) auto !important;
}

/* Sign-up line. */
body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__fieldlabel {
	font-family: var(--font-body) !important;
	font-size: var(--text-xs) !important;
	font-weight: 600 !important;
	letter-spacing: var(--tracking-wide) !important;
	text-transform: uppercase !important;
	color: var(--ink) !important;
	opacity: 0.55;
	text-align: left;
	margin: 0 0 0.55rem 0 !important;
}

/* The shared underline: field + button sit on one rule. */
body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__form {
	gap: 1rem !important;
	border-bottom: 2px solid color-mix(in srgb, var(--ink) 32%, transparent);
	padding-bottom: 0.7rem;
	transition: border-color var(--duration-fast, 0.18s) var(--ease-default, ease);
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__form:hover,
body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__form:focus-within {
	border-bottom-color: var(--accent);
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__input {
	flex: 1 1 auto !important;
	font-family: var(--font-body) !important;
	font-size: clamp(1.05rem, 2vw, 1.3rem) !important;
	line-height: 1.2 !important;
	color: var(--ink) !important;
	opacity: 0.42;
	text-align: left;
	margin: 0 !important;
}

/* Button as a minimal text + arrow on the rule — no box. */
body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__actions {
	flex: 0 0 auto;
	margin: 0 !important;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__cta .wp-block-button__link {
	background: transparent !important;
	color: var(--accent) !important;
	border: 0 !important;
	padding: 0 0 0.1rem 0 !important;
	font-family: var(--font-body);
	font-weight: 600;
	font-size: clamp(1.02rem, 1.8vw, 1.22rem);
	letter-spacing: var(--tracking-wide);
	transition: opacity var(--duration-fast, 0.18s) var(--ease-default, ease),
		transform var(--duration-fast, 0.18s) var(--ease-default, ease);
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__cta .wp-block-button__link:hover {
	transform: translateX(3px);
	opacity: 0.82;
}

/* Keyboard focus ring — the CTA is a borderless text+arrow, so an offset
   outline is the only visible affordance for keyboard users. */
body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__cta .wp-block-button__link:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-radius: var(--decor-radius);
	opacity: 1;
}

body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__note {
	font-family: var(--font-body) !important;
	font-size: var(--text-xs) !important;
	line-height: 1.5 !important;
	color: var(--ink) !important;
	opacity: 0.58;
	margin: var(--space-md) auto 0 auto !important;
}

/* Cap wide tracking on the uppercase kicker at small widths (A5). */
@media (max-width: 640px) {
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__kicker {
		letter-spacing: 0 !important;
	}
}

/* Mobile: field + button stay on one rule but tighten. */
@media (max-width: 480px) {
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__form {
		gap: 0.6rem !important;
	}
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__input {
		font-size: 1rem !important;
	}
}

/* Reduced motion: drop the underline + CTA transitions/transforms. */
@media (prefers-reduced-motion: reduce) {
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__form,
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__cta .wp-block-button__link {
		transition: none;
	}
	body.aibt-universal .universal-newsletter--underline-field .universal-newsletter__cta .wp-block-button__link:hover {
		transform: none;
	}
}