/*
 * KlenWriter Theme v2 — header chrome.
 *
 * Sticky glass bar (canon §2.4, §10), brand, primary navigation with a mobile
 * overlay, search field, and icon buttons (theme + reading). Quiet, dense, and
 * readable in both themes with a no-blur fallback (docs/10 §9, QA docs/31 §2).
 */

/* ------------------------------------------------------------------ */
/* Bar — full-bleed sticky, glass with opaque fallback                */
/* ------------------------------------------------------------------ */
.wp-site-blocks > .kwt-header-slot,
.wp-site-blocks > .wp-block-template-part:has(.kwt-site-header) {
	position: sticky;
	top: 0;
	z-index: var(--kwt-z-header);
}

.kwt-site-header {
	position: relative;
	z-index: 1;
	padding: 0.75rem 1rem;
	background-color: color-mix(in srgb, var(--kwt-color-background) 92%, transparent);
	border-bottom: 0;
}

@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.kwt-site-header {
		background-color: color-mix(in srgb, var(--kwt-color-background) 78%, transparent);
		-webkit-backdrop-filter: saturate(140%) blur(14px);
		backdrop-filter: saturate(140%) blur(14px);
	}
}

.kwt-site-header__inner {
	margin-inline: auto;
	max-width: var(--kwt-wide-width);
	padding: 0.9rem 1.25rem;
	display: flex;
	align-items: center;
	gap: clamp(0.75rem, 2vw, 1.25rem);
	background-color: color-mix(in srgb, var(--kwt-color-surface) 90%, var(--kwt-color-background));
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-2xl);
	box-shadow: var(--kwt-shadow-subtle);
}

/* ------------------------------------------------------------------ */
/* Brand                                                              */
/* ------------------------------------------------------------------ */
.kwt-site-header__brand {
	display: grid;
	grid-template-columns: 2.75rem minmax(0, auto);
	grid-template-areas: "logo title";
	column-gap: 0.8rem;
	align-items: center;
	line-height: 1.15;
	margin-right: auto;
	min-width: 0;
}

.kwt-site-header__logo {
	grid-area: logo;
	margin: 0;
	width: 2.75rem;
	height: 2.75rem;
	display: grid;
	place-items: center;
	overflow: hidden;
	background-color: var(--kwt-color-paper);
	border: 1px solid color-mix(in srgb, var(--kwt-color-manuscript) 42%, var(--kwt-color-border));
	border-radius: var(--kwt-radius-md);
	color: var(--kwt-color-ink);
	font-size: 0.9rem;
	font-weight: 850;
	line-height: 1;
	text-decoration: none;
}

.kwt-site-header__logo img {
	display: block;
	width: 100%;
	height: 100%;
}

.kwt-site-header__logo img {
	object-fit: cover;
}

.kwt-site-header__brand .wp-block-site-title {
	grid-area: title;
	margin: 0;
	font-size: 1.0625rem;
	font-weight: 800;
	letter-spacing: var(--kwt-tracking-tight);
}

.kwt-site-header__brand .wp-block-site-title a {
	color: var(--kwt-color-foreground-strong);
	text-decoration: none;
}

/* ------------------------------------------------------------------ */
/* Primary navigation                                                 */
/* ------------------------------------------------------------------ */
.kwt-header-nav {
	font-size: 0.9375rem;
	font-weight: 600;
}

.kwt-header-nav__list,
.kwt-header-nav__submenu {
	list-style: none;
	margin: 0;
	padding: 0;
}

.kwt-header-nav__list {
	display: flex;
	align-items: center;
	gap: 0.45rem;
}

.kwt-header-nav__item {
	position: relative;
}

.kwt-header-nav__item.has-children::after {
	content: "";
	position: absolute;
	inset: 100% 0 auto;
	height: 0.55rem;
}

.kwt-header-nav__link {
	display: inline-flex;
	align-items: center;
	gap: 0.45rem;
	color: var(--kwt-color-foreground);
	padding: 0.55rem 1rem;
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-pill);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 62%, transparent);
	text-decoration: none;
	transition: background-color var(--kwt-transition-fast) var(--kwt-ease-out),
		border-color var(--kwt-transition-fast) var(--kwt-ease-out),
		color var(--kwt-transition-fast) var(--kwt-ease-out);
}

.kwt-header-nav__link:hover,
.kwt-header-nav__link:focus-visible,
.kwt-header-nav__item.is-active > .kwt-header-nav__link {
	color: var(--kwt-color-primary);
	border-color: color-mix(in srgb, var(--kwt-color-primary) 48%, var(--kwt-color-border));
	background-color: color-mix(in srgb, var(--kwt-color-primary) 12%, transparent);
}

.kwt-header-nav__arrow {
	width: 0.42rem;
	height: 0.42rem;
	border-right: 1.8px solid currentColor;
	border-bottom: 1.8px solid currentColor;
	transform: rotate(45deg) translateY(-0.1rem);
}

/* ------------------------------------------------------------------ */
/* Actions cluster (search + icon buttons)                            */
/* ------------------------------------------------------------------ */
.kwt-header-actions {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.kwt-header-search {
	max-width: 13rem;
}

.kwt-icon-button.kwt-icon-button--menu {
	display: none;
}

.kwt-header-search .wp-block-search__input {
	background-color: var(--kwt-color-surface-muted);
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-pill);
	color: var(--kwt-color-foreground);
	padding: 0.45rem 0.85rem;
}

.kwt-header-search .wp-block-search__input::placeholder {
	color: var(--kwt-color-faint);
}

/* ------------------------------------------------------------------ */
/* Icon buttons (theme + reading)                                     */
/* ------------------------------------------------------------------ */
.kwt-icon-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 2.5rem;
	height: 2.5rem;
	flex: 0 0 auto;
	padding: 0;
	color: var(--kwt-color-foreground);
	background-color: var(--kwt-color-surface-muted);
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-pill);
	cursor: pointer;
	transition: background-color var(--kwt-transition-fast) var(--kwt-ease-out),
		border-color var(--kwt-transition-fast) var(--kwt-ease-out),
		color var(--kwt-transition-fast) var(--kwt-ease-out);
}

.kwt-icon-button:hover {
	color: var(--kwt-color-primary);
	border-color: var(--kwt-color-primary);
	background-color: color-mix(in srgb, var(--kwt-color-primary) 12%, var(--kwt-color-surface-muted));
}

.kwt-icon-button svg {
	width: 1.15rem;
	height: 1.15rem;
	fill: none;
	stroke: currentColor;
	stroke-width: 1.8;
	stroke-linecap: round;
	stroke-linejoin: round;
}

/* Theme toggle — show the icon for the mode you'd switch TO. */
.kwt-icon-button--theme .kwt-icon-sun {
	display: none;
}

.kwt-icon-button--theme .kwt-icon-moon {
	display: block;
}

:root[data-kwt-theme="dark"] .kwt-icon-button--theme .kwt-icon-sun {
	display: block;
}

:root[data-kwt-theme="dark"] .kwt-icon-button--theme .kwt-icon-moon {
	display: none;
}

/* Reading button reflects distraction-free state once Phase 3 styles it. */
.kwt-icon-button[aria-pressed="true"] {
	color: var(--kwt-color-primary);
	border-color: var(--kwt-color-primary);
	background-color: color-mix(in srgb, var(--kwt-color-primary) 16%, transparent);
}

/* ------------------------------------------------------------------ */
/* Dropdown submenus — up to 3 levels max (canon §10).                */
/* Level 1 = top bar · level 2 = dropdown panel · level 3 = flyout.    */
/* Depth beyond 3 is an editorial rule, not enforced in CSS.          */
/* ------------------------------------------------------------------ */
.kwt-header-nav__submenu {
	position: absolute;
	left: 0;
	top: calc(100% + 0.45rem);
	box-sizing: border-box;
	visibility: hidden;
	opacity: 0;
	pointer-events: none;
	transform: translateY(0.25rem);
	transition:
		opacity var(--kwt-transition-fast) var(--kwt-ease-out),
		transform var(--kwt-transition-fast) var(--kwt-ease-out),
		visibility var(--kwt-transition-fast) var(--kwt-ease-out);
	margin-top: 0;
	background-color: color-mix(in srgb, var(--kwt-color-surface) 92%, var(--kwt-color-background)) !important;
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-xl);
	box-shadow: var(--kwt-glow-menu);
	padding: 0.85rem;
	min-width: 14.5rem;
	z-index: var(--kwt-z-overlay);
}

.kwt-header-nav__submenu * {
	box-sizing: border-box;
}

.kwt-header-nav__item.is-overflow > .kwt-header-nav__submenu {
	right: 0;
	left: auto;
}

@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.kwt-header-nav__submenu {
		background-color: color-mix(in srgb, var(--kwt-color-surface) 82%, transparent) !important;
		border-color: var(--kwt-glass-border);
		-webkit-backdrop-filter: saturate(140%) blur(14px);
		backdrop-filter: saturate(140%) blur(14px);
	}
}

.kwt-header-nav__item.has-children:hover > .kwt-header-nav__submenu,
.kwt-header-nav__item.has-children:focus-within > .kwt-header-nav__submenu {
	visibility: visible;
	opacity: 1;
	pointer-events: auto;
	transform: translateY(0);
}

.kwt-header-nav__submenu .kwt-header-nav__link {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	width: 100%;
	max-width: 100%;
	padding: 0.75rem 0.9rem;
	color: var(--kwt-color-foreground-strong);
	border-radius: var(--kwt-radius-md);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 70%, transparent);
	border: 1px solid color-mix(in srgb, var(--kwt-color-border) 78%, transparent);
	font-weight: 750;
	line-height: 1.2;
}

.kwt-header-nav__submenu .kwt-header-nav__link:hover,
.kwt-header-nav__submenu .kwt-header-nav__link:focus-visible,
.kwt-header-nav__submenu .is-active > .kwt-header-nav__link {
	color: var(--kwt-color-primary);
}

.kwt-header-nav__submenu .kwt-header-nav__item + .kwt-header-nav__item {
	margin-top: 0.55rem;
}

/* Level 3 flyout — opens to the side of its level-2 parent (core sets
 * left:100%); align its top edge with the parent row. */
.kwt-header-nav__submenu .kwt-header-nav__submenu {
	left: 100%;
	top: 0;
	margin-top: 0;
	margin-left: 0;
}

.kwt-header-nav__item.is-overflow .kwt-header-nav__submenu .kwt-header-nav__submenu {
	right: 100%;
	left: auto;
	margin-right: 0;
	margin-left: 0;
}

.kwt-header-nav__submenu .kwt-header-nav__arrow {
	transform: rotate(-45deg);
}

.kwt-header-nav__item.is-overflow .kwt-header-nav__submenu .kwt-header-nav__arrow {
	transform: rotate(135deg);
}

/* ------------------------------------------------------------------ */
/* Custom mobile menu shell                                           */
/* ------------------------------------------------------------------ */
.kwt-mobile-menu {
	position: fixed;
	inset: 0;
	z-index: var(--kwt-z-overlay);
	display: none;
	padding: 0.15rem 1rem 1rem;
	place-items: start center;
}

.kwt-mobile-menu,
.kwt-mobile-menu * {
	box-sizing: border-box;
}

.kwt-mobile-menu[hidden] {
	display: none;
}

.kwt-mobile-menu:not([hidden]) {
	display: grid;
}

.kwt-mobile-menu__scrim {
	position: absolute;
	inset: 0;
	background-color: var(--kwt-scrim);
	border: 0;
	cursor: pointer;
}

.kwt-mobile-menu__panel {
	position: relative;
	z-index: 1;
	width: min(22rem, calc(100vw - 2rem));
	max-height: calc(100vh - 1rem);
	max-width: 100%;
	overflow-x: hidden;
	overflow-y: auto;
	padding: 1.25rem;
	color: var(--kwt-color-foreground);
	background-color: var(--kwt-color-surface);
	border: 1px solid var(--kwt-color-border-strong);
	border-radius: var(--kwt-radius-2xl);
	box-shadow: var(--kwt-shadow-hover);
}

@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.kwt-mobile-menu__panel {
		background-color: var(--kwt-glass-bg);
		border-color: var(--kwt-glass-border);
		-webkit-backdrop-filter: saturate(145%) blur(18px);
		backdrop-filter: saturate(145%) blur(18px);
	}
}

.kwt-mobile-menu__head {
	display: grid;
	grid-template-columns: 2.4rem minmax(0, 1fr) 2.75rem;
	gap: 0.85rem;
	align-items: center;
}

.kwt-mobile-menu__logo {
	width: 2.4rem;
	aspect-ratio: 1;
	display: grid;
	place-items: center;
	overflow: hidden;
	background-color: var(--kwt-color-paper);
	border: 1px solid color-mix(in srgb, var(--kwt-color-manuscript) 40%, var(--kwt-color-border));
	border-radius: var(--kwt-radius-md);
}

.kwt-mobile-menu__logo img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.kwt-mobile-menu__brand {
	min-width: 0;
}

.kwt-mobile-menu__brand p {
	margin: 0;
	color: var(--kwt-color-foreground-strong);
	font-size: 1.125rem;
	font-weight: 800;
	line-height: 1.15;
	overflow-wrap: anywhere;
}

.kwt-mobile-menu__brand span {
	display: block;
	margin-top: 0.12rem;
	color: var(--kwt-color-muted);
	font-size: 0.8125rem;
	line-height: 1.2;
}

.kwt-mobile-menu__close {
	width: 2.75rem;
	height: 2.75rem;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	color: var(--kwt-color-primary);
	background-color: color-mix(in srgb, var(--kwt-color-primary) 12%, var(--kwt-color-surface-muted));
	border: 1px solid color-mix(in srgb, var(--kwt-color-primary) 40%, var(--kwt-color-border));
	border-radius: var(--kwt-radius-pill);
	font: inherit;
	font-size: 1.15rem;
	font-weight: 750;
	cursor: pointer;
}

.kwt-mobile-menu__search {
	margin-top: 2rem;
}

.kwt-mobile-menu__views {
	display: grid;
	width: 100%;
	min-width: 0;
}

.kwt-mobile-menu__view {
	grid-area: 1 / 1;
	width: 100%;
	min-width: 0;
}

.kwt-mobile-menu__view[aria-hidden="true"] {
	display: none;
	pointer-events: none;
}

.kwt-mobile-menu__view--main {
	display: block;
}

.kwt-mobile-menu__view--submenu {
	display: none;
}

.kwt-mobile-menu__view--submenu[aria-hidden="false"] {
	display: block;
}

.kwt-mobile-menu__back {
	width: 100%;
	min-height: 3rem;
	display: grid;
	grid-template-columns: 2.15rem minmax(0, 1fr);
	gap: 0.75rem;
	align-items: center;
	margin-top: 2rem;
	padding: 0.45rem 0.85rem;
	color: var(--kwt-color-foreground);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 70%, transparent);
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-lg);
	font: inherit;
	font-weight: 800;
	text-align: left;
	cursor: pointer;
}

.kwt-mobile-menu__back:hover,
.kwt-mobile-menu__back:focus-visible {
	color: var(--kwt-color-primary);
	border-color: color-mix(in srgb, var(--kwt-color-primary) 50%, var(--kwt-color-border));
	background-color: color-mix(in srgb, var(--kwt-color-primary) 12%, var(--kwt-color-surface));
}

.kwt-mobile-menu__back span:first-child {
	width: 2.15rem;
	aspect-ratio: 1;
	display: inline-grid;
	place-items: center;
	color: var(--kwt-color-primary);
	background-color: color-mix(in srgb, var(--kwt-color-primary) 12%, var(--kwt-color-surface-muted));
	border: 1px solid color-mix(in srgb, var(--kwt-color-primary) 35%, var(--kwt-color-border));
	border-radius: var(--kwt-radius-pill);
	font-size: 1.35rem;
	line-height: 1;
}

.kwt-mobile-menu__back span:last-child {
	min-width: 0;
	overflow-wrap: anywhere;
}

.kwt-mobile-menu__search input {
	width: 100%;
	min-height: 3rem;
	padding: 0.7rem 1.15rem;
	color: var(--kwt-color-foreground);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 72%, transparent);
	border: 1px solid color-mix(in srgb, var(--kwt-color-primary) 24%, var(--kwt-color-border));
	border-radius: var(--kwt-radius-pill);
	font: inherit;
	font-size: 0.9375rem;
}

.kwt-mobile-menu__search input::placeholder {
	color: var(--kwt-color-muted);
	opacity: 1;
}

.kwt-mobile-menu__nav {
	margin-top: 2rem;
	display: grid;
	gap: 0.9rem;
	width: 100%;
	min-width: 0;
}

.kwt-mobile-menu__item {
	min-height: 3.9rem;
	width: 100%;
	display: grid;
	grid-template-columns: minmax(0, 1fr) auto;
	gap: 0.75rem;
	align-items: center;
	padding: 0.78rem 1rem 0.78rem 1.15rem;
	color: var(--kwt-color-foreground);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 74%, var(--kwt-color-surface));
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-lg);
	font: inherit;
	text-align: left;
	text-decoration: none;
	cursor: pointer;
}

.kwt-mobile-menu__item:not(.has-children) {
	grid-template-columns: minmax(0, 1fr);
}

.kwt-mobile-menu__item:hover,
.kwt-mobile-menu__item:focus-visible,
.kwt-mobile-menu__item.is-active {
	color: var(--kwt-color-primary);
	border-color: color-mix(in srgb, var(--kwt-color-primary) 55%, var(--kwt-color-border));
	background-color: color-mix(in srgb, var(--kwt-color-primary) 14%, var(--kwt-color-surface));
}

.kwt-mobile-menu__item-text {
	min-width: 0;
	display: grid;
	gap: 0.18rem;
}

.kwt-mobile-menu__item-text strong {
	color: currentColor;
	font-size: 0.95rem;
	font-weight: 800;
	line-height: 1.18;
	overflow-wrap: anywhere;
}

.kwt-mobile-menu__item-text span {
	color: var(--kwt-color-muted);
	font-size: 0.8125rem;
	line-height: 1.3;
}

.kwt-mobile-menu__item.is-active .kwt-mobile-menu__item-text span {
	color: color-mix(in srgb, var(--kwt-color-primary) 50%, var(--kwt-color-muted));
}

.kwt-mobile-menu__arrow {
	color: var(--kwt-color-primary);
	font-size: 1.55rem;
	font-weight: 800;
	line-height: 1;
}

.kwt-mobile-menu__settings {
	margin-top: 2.1rem;
}

.kwt-mobile-menu__settings p {
	margin: 0 0 0.85rem;
	color: var(--kwt-color-foreground);
	font-size: 0.875rem;
	font-weight: 800;
}

.kwt-mobile-menu__setting-row {
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem;
}

.kwt-mobile-menu__setting-row button {
	min-height: 2.25rem;
	padding: 0.45rem 1rem;
	color: var(--kwt-color-foreground);
	background-color: color-mix(in srgb, var(--kwt-color-surface-muted) 70%, transparent);
	border: 1px solid var(--kwt-color-border);
	border-radius: var(--kwt-radius-pill);
	font: inherit;
	font-size: 0.8125rem;
	font-weight: 750;
	cursor: pointer;
}

.kwt-mobile-menu__setting-row button[aria-pressed="true"] {
	color: var(--kwt-color-primary);
	background-color: color-mix(in srgb, var(--kwt-color-primary) 14%, var(--kwt-color-surface));
	border-color: color-mix(in srgb, var(--kwt-color-primary) 55%, var(--kwt-color-border));
}

:root[data-kwt-theme="dark"] .kwt-mobile-menu__setting-row [data-kwt-set="theme"][data-kwt-value="dark"] {
	order: -1;
}

/* ------------------------------------------------------------------ */
/* Mobile (canon §27) — overlay nav, compact actions, no h-scroll     */
/* ------------------------------------------------------------------ */
@media (max-width: 700px) {
	.kwt-site-header__inner {
		flex-wrap: wrap;
		gap: 0.5rem;
	}

	.kwt-header-nav {
		display: none;
	}

	.kwt-header-search {
		display: none;
	}

	.kwt-icon-button.kwt-icon-button--menu {
		display: inline-flex;
	}

	.kwt-mobile-menu-is-open body {
		overflow: hidden;
	}
}