/* =========================================================
   COMPONENT: Header
   Su dung o: moi trang (global)
   CSS mobile-first: mac dinh = mobile, min-width mo rong len.
   Dependencies: tokens.css
   ========================================================= */

/* Header dính trên cùng, nền kính mờ hiện đại */
.am__header {
	position: sticky;
	top: 0;
	z-index: var(--am-z-header);
	background: rgba(255, 255, 255, 0.7);
	-webkit-backdrop-filter: saturate(180%) blur(20px);
	backdrop-filter: saturate(180%) blur(20px);
	border-bottom: 1px solid rgba(0, 0, 0, 0.05);
	box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
	transition: background-color var(--am-duration-normal) var(--am-ease);
}

.am__header__inner {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: var(--am-space-3);
	padding-block: var(--am-space-3);
}

.am__header__title {
	font-family: var(--am-font-heading);
	font-size: var(--am-fs-xl);
	font-weight: 800;
	color: var(--am-color-primary);
	text-decoration: none;
	letter-spacing: -0.03em;
}

/* --- Nav: mac dinh mobile = an, mo bang class is-open --- */
.am__header__nav {
	display: none;
	flex-basis: 100%;
}

.am__header__nav.is-open {
	display: block;
}

.am__header__nav .am__menu {
	display: flex;
	flex-direction: column;
	gap: var(--am-space-1);
	margin: 0;
	padding: 0;
	padding-block: var(--am-space-3);
	list-style: none;
}

/* Link nav — padding du lon de cham (tap target >= 44px) */
.am__header__nav a {
	display: block;
	padding: var(--am-space-3) 0;
	color: var(--am-color-text);
	font-weight: var(--am-fw-medium);
	text-decoration: none;
}

.am__header__nav a:hover {
	color: var(--am-color-primary);
}

/* --- Toggle mobile: hien o mobile, an o desktop --- */
.am__header__toggle {
	display: inline-flex;
	flex-direction: column;
	justify-content: center;
	gap: 4px;
	width: 44px;
	height: 44px;
	padding: 10px;
	background: transparent;
	border: var(--am-border-w) solid var(--am-color-border);
	border-radius: var(--am-radius-sm);
	cursor: pointer;
}

.am__header__toggle-icon,
.am__header__toggle-icon::before,
.am__header__toggle-icon::after {
	content: "";
	display: block;
	height: 2px;
	background: var(--am-color-text);
}

/* --- Tablet tro len (>= 768px) --- */
@media (min-width: 768px) {
	.am__header__inner {
		flex-wrap: nowrap;
	}

	.am__header__nav {
		display: block;
		flex-basis: auto;
	}

	.am__header__nav .am__menu {
		flex-direction: row;
		gap: var(--am-space-5);
		padding-block: 0;
	}

	.am__header__nav a {
		padding: var(--am-space-2) 0;
	}

	.am__header__toggle {
		display: none;
	}
}

/* --- Vung cong cu: o tim kiem + nut ngau nhien --- */
.am__header__tools {
	display: flex;
	align-items: center;
	gap: var(--am-space-3);
	flex-basis: 100%;          /* mobile: xuong dong rieng */
}

.am__search {
	position: relative; /* moc cho dropdown ket qua tim kiem */
	display: flex;
	flex: 1;
	min-width: 0;
}

.am__search__input {
	flex: 1;
	min-width: 0;
	padding: var(--am-space-3) var(--am-space-4);
	font-size: var(--am-fs-sm);
	color: var(--am-color-text);
	background: var(--am-color-bg-soft);
	border: 1px solid var(--am-color-border);
	border-right: 0;
	border-radius: var(--am-radius-lg) 0 0 var(--am-radius-lg);
	transition: all var(--am-duration-fast) var(--am-ease);
}

.am__search__input:focus {
	outline: none;
	background: var(--am-color-bg);
	border-color: var(--am-color-primary);
	box-shadow: 0 0 0 4px var(--am-color-primary-soft);
}

.am__search__btn {
	flex-shrink: 0;
	padding: var(--am-space-3) var(--am-space-5);
	font-size: var(--am-fs-sm);
	font-weight: var(--am-fw-bold);
	color: var(--am-color-text-invert);
	background: var(--am-color-primary);
	border: 1px solid var(--am-color-primary);
	border-radius: 0 var(--am-radius-lg) var(--am-radius-lg) 0;
	cursor: pointer;
	transition: all var(--am-duration-fast) var(--am-ease);
}

.am__search__btn:hover {
	background: var(--am-color-primary-hover);
	border-color: var(--am-color-primary-hover);
	transform: translateX(1px);
}

/* --- Dropdown ket qua tim kiem tuc thi (smart search) --- */
.am__search__results {
	position: absolute;
	top: calc(100% + var(--am-space-1));
	left: 0;
	right: 0;
	z-index: 20;
	max-height: 64vh;
	overflow-y: auto;
	padding: var(--am-space-1);
	background: var(--am-color-bg);
	border: var(--am-border-w) solid var(--am-color-border);
	border-radius: var(--am-radius-md);
	box-shadow: 0 8px 28px rgba(0, 0, 0, 0.14);
}

.am__search__results[hidden] {
	display: none;
}

.am__search__item {
	display: flex;
	align-items: center;
	gap: var(--am-space-2);
	padding: var(--am-space-2);
	color: var(--am-color-text);
	text-decoration: none;
	border-radius: var(--am-radius-sm);
}

.am__search__item:hover,
.am__search__item.is-active {
	background: var(--am-color-bg-soft);
}

.am__search__item img {
	flex-shrink: 0;
	width: 44px;
	height: 44px;
	object-fit: cover;
	border-radius: var(--am-radius-xs);
}

.am__search__item span {
	overflow: hidden;
	font-size: var(--am-fs-sm);
	font-weight: var(--am-fw-medium);
	white-space: nowrap;
	text-overflow: ellipsis;
}

.am__search__empty {
	margin: 0;
	padding: var(--am-space-3);
	font-size: var(--am-fs-sm);
	color: var(--am-color-text-muted);
	text-align: center;
}

@media (min-width: 768px) {
	.am__header__tools {
		flex-basis: auto;
		margin-left: auto;
	}

	.am__search {
		flex: 0 0 clamp(320px, 38vw, 540px);
	}
}

/* Khoa scroll body khi menu mobile dang mo (JS toggle class nay) */
.am__body--locked {
	overflow: hidden;
}