/*
 * Home Lab: token thiết kế, reset, kiểu chữ, bố cục, nút.
 * Mọi giá trị thiết kế (màu, font, khoảng cách) khai báo ở :root bên dưới.
 * Breakpoint dùng thống nhất: 600px (điện thoại nhỏ), 860px (mobile/desktop), 1100px (desktop rộng).
 */
:root {
	--hl-color-navy: #00476b;
	--hl-color-navy-dark: #04283c;
	--hl-color-navy-darker: #021b29;
	--hl-color-green: #057743;
	--hl-color-green-light: #0a9a58;
	--hl-color-cream: #f6f2eb;
	--hl-color-ink: #16212a;
	--hl-color-muted: #5b6770;
	--hl-color-line: rgba(22, 33, 42, 0.12);
	--hl-color-white: #fff;
	--hl-color-zalo: #0068ff;
	--hl-color-messenger: #0084ff;

	--hl-font-sans: "K2D", system-ui, -apple-system, "Segoe UI", sans-serif;
	--hl-font-serif: "K2D", system-ui, -apple-system, "Segoe UI", sans-serif;

	--hl-space-1: 0.25rem;
	--hl-space-2: 0.5rem;
	--hl-space-3: 1rem;
	--hl-space-4: 1.5rem;
	--hl-space-5: 2.5rem;
	--hl-space-6: 4rem;
	--hl-space-7: 6rem;

	--hl-radius-s: 10px;
	--hl-radius-m: 18px;
	--hl-radius-l: 26px;
	--hl-container: 1180px;
	--hl-header-h: 68px;
	--hl-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
	--hl-shadow: 0 30px 60px -30px rgba(2, 27, 41, 0.45);
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
	-webkit-text-size-adjust: 100%;
	scroll-padding-top: calc(var(--hl-header-h) + 16px);
}

body {
	margin: 0;
	font-family: var(--hl-font-sans);
	font-size: 1rem;
	line-height: 1.65;
	color: var(--hl-color-ink);
	background: var(--hl-color-cream);
	-webkit-font-smoothing: antialiased;
	font-variant-numeric: lining-nums;
	overflow-x: hidden;
}

img,
svg,
video {
	display: block;
	max-width: 100%;
	height: auto;
}

a {
	color: inherit;
	text-decoration: none;
}

button {
	font: inherit;
	color: inherit;
	background: none;
	border: 0;
	padding: 0;
	cursor: pointer;
}

ul,
ol {
	margin: 0;
	padding: 0;
}

:focus-visible {
	outline: 2px solid var(--hl-color-green-light);
	outline-offset: 3px;
}

.screen-reader-text {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.hl-skip {
	position: fixed;
	left: 12px;
	top: -60px;
	z-index: 200;
	padding: 10px 16px;
	border-radius: var(--hl-radius-s);
	background: var(--hl-color-green);
	color: #fff;
	transition: top 0.3s;
}

.hl-skip:focus {
	top: 12px;
}

/* Kiểu chữ */
h1,
h2,
h3,
h4 {
	margin: 0 0 0.5em;
	font-family: var(--hl-font-serif);
	font-weight: 500;
	line-height: 1.12;
	letter-spacing: -0.01em;
	font-variant-numeric: lining-nums;
	color: var(--hl-color-navy);
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); }
h2 { font-size: clamp(2rem, 4.2vw, 3.2rem); }
h3 { font-size: clamp(1.45rem, 2.4vw, 1.85rem); }
h4 { font-size: 1.3rem; }

p {
	margin: 0 0 1em;
}

.hl-eyebrow {
	display: inline-block;
	font-size: 0.75rem;
	font-weight: 500;
	letter-spacing: 0.22em;
	text-transform: uppercase;
	color: var(--hl-color-green);
}

.hl-lead {
	font-size: clamp(1.05rem, 1.6vw, 1.2rem);
	color: var(--hl-color-muted);
	max-width: 60ch;
}

/* Bố cục */
.hl-container {
	width: min(var(--hl-container), 100% - 40px);
	margin-inline: auto;
}

.hl-section {
	padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.hl-section--dark {
	background: var(--hl-color-navy-dark);
	color: rgba(255, 255, 255, 0.85);
}

.hl-section--dark h1,
.hl-section--dark h2,
.hl-section--dark h3 {
	color: #fff;
}

.hl-main {
	min-height: 60vh;
}

.hl-page--inner .hl-main {
	padding-top: var(--hl-header-h);
}

.hl-grid {
	display: grid;
	gap: var(--hl-space-4);
	grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}

/* Nút */
.hl-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 10px;
	min-height: 44px;
	padding: 12px 26px;
	border-radius: 999px;
	font-weight: 500;
	font-size: 0.95rem;
	line-height: 1.2;
	transition: transform 0.5s var(--hl-ease), background 0.4s, box-shadow 0.4s, color 0.4s;
}

.hl-btn .hl-icon {
	width: 18px;
	height: 18px;
}

/* Nút chat theo màu từng app */
.hl-btn--zalo {
	background: var(--hl-color-zalo);
	color: #fff;
}

.hl-btn--zalo:hover {
	background: #2a82ff;
	transform: translateY(-2px);
}

.hl-btn--messenger {
	background: linear-gradient(135deg, #00b2ff, #006aff);
	color: #fff;
}

.hl-btn--messenger:hover {
	transform: translateY(-2px);
}

.hl-eyebrow--light {
	color: #7fe0ae;
}

.hl-btn--green {
	background: var(--hl-color-green);
	color: #fff;
	box-shadow: 0 10px 30px -10px rgba(5, 119, 67, 0.7);
}

.hl-btn--green:hover {
	background: var(--hl-color-green-light);
	transform: translateY(-2px);
}

.hl-btn--navy {
	background: var(--hl-color-navy);
	color: #fff;
}

.hl-btn--navy:hover {
	background: var(--hl-color-navy-dark);
	transform: translateY(-2px);
}

.hl-btn--ghost {
	border: 1px solid rgba(255, 255, 255, 0.5);
	color: #fff;
}

.hl-btn--ghost:hover {
	background: rgba(255, 255, 255, 0.12);
}

.hl-btn--line {
	border: 1px solid var(--hl-color-navy);
	color: var(--hl-color-navy);
}

.hl-btn--line:hover {
	background: var(--hl-color-navy);
	color: #fff;
}

.hl-icon {
	width: 20px;
	height: 20px;
	flex: none;
}

/* Hiện dần khi cuộn. Chỉ áp dụng khi trình duyệt chạy được JS, nên không có JS vẫn thấy đủ nội dung. */
@media (scripting: enabled) {
	.hl-reveal {
		opacity: 0;
		transform: translateY(24px);
		transition: opacity 1s var(--hl-ease), transform 1s var(--hl-ease);
		transition-delay: calc(var(--d, 0) * 110ms);
	}

	.hl-reveal.is-in {
		opacity: 1;
		transform: none;
	}
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation: none !important;
		transition: none !important;
	}

	.hl-reveal {
		opacity: 1 !important;
		transform: none !important;
	}
}