/*
 * Homepage sections — hero, about, services, clients, blog, CTA.
 * Ngôn ngữ thị giác: dark + gold, góc vuông, nhịp điện ảnh, nhiều khoảng thở.
 */

/* ---------- Hero ---------- */

.hero__title {
	letter-spacing: 0.04em;
	margin-bottom: var(--space-xs);
}

.hero__tagline {
	font-size: var(--fs-h3);
	font-weight: 300;
	color: var(--color-cream);
	letter-spacing: 0.02em;
	text-align: left;
	margin-left: 0;
}

/* vạch gold dọc — chạy từ tagline xuống hết hero, nối thị giác vào số 01 bên dưới */
.hero__content {
	padding-bottom: 0;
	width: 100%; /* hero là flex container — không set width thì .container bị shrink-to-fit + margin auto đẩy vào giữa */
}

.hero__content::after {
	content: '';
	display: block;
	width: 1px;
	height: calc(var(--space-xl) + var(--space-md));
	margin-top: var(--space-md);
	background: var(--color-gold);
	opacity: 0.75;
}

/* đoạn nối tiếp trong section 01: vạch chạy tiếp từ border xuống chạm ghost number */
.section--about .container {
	position: relative;
}

.section--about .container::before {
	content: '';
	position: absolute;
	top: calc(-1 * var(--space-xl));
	left: var(--space-md);
	width: 1px;
	height: var(--space-xl);
	background: linear-gradient(to bottom, var(--color-gold), transparent);
	opacity: 0.75;
}

/* ---------- About (01) ---------- */

.about-layout {
	display: grid;
	grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
	gap: var(--space-lg);
	align-items: center;
}

.about-media img {
	width: 100%;
	height: auto;
	display: block;
}

.about-lede {
	max-width: 62ch;
}

.about-lede__statement {
	font-family: var(--font-display);
	font-stretch: var(--font-stretch-display);
	font-size: var(--fs-h3);
	font-weight: 600;
	color: var(--color-cream);
	margin-bottom: var(--space-sm);
}

.about-lede__body {
	margin-bottom: var(--space-md);
}

/* ---------- Services (02) ---------- */

/* 5 card cân xứng: grid 6 cột — hàng trên 3 card (mỗi card 2 cột), hàng dưới 2 card căn giữa */
.services-grid {
	display: grid;
	grid-template-columns: repeat(6, 1fr);
	gap: var(--space-sm);
}

.service-card {
	grid-column: span 2;
	display: flex;
	flex-direction: column;
	gap: var(--space-sm);
	padding: var(--space-sm);
	border: 1px solid var(--color-border);
	background: var(--color-bg-alt);
	transition: border-color var(--transition-base);
}

.service-card:nth-child(4) {
	grid-column: 2 / span 2;
}

.service-card__media {
	display: block;
	aspect-ratio: 16 / 10;
	overflow: hidden;
}

.service-card__media img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform var(--transition-base);
}

.service-card__title {
	margin: 0;
	font-size: var(--fs-h3);
}

.service-card__foot {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-top: auto;
}

.service-card__arrow {
	font-size: var(--fs-h3);
	color: var(--color-cream);
	transition: color var(--transition-base), transform var(--transition-base);
}

.service-card__icon {
	color: var(--color-gold);
	opacity: 0.85;
}

.service-card:hover,
.service-card:focus-visible {
	border-color: var(--color-gold);
}

.service-card:hover .service-card__media img {
	transform: scale(1.04);
}

.service-card:hover .service-card__arrow {
	color: var(--color-gold);
	transform: translateX(6px);
}

/* ---------- Clients (nằm trong Why Us — social proof) ---------- */

.why-clients {
	margin-top: var(--space-lg);
	padding-top: var(--space-lg);
	border-top: 1px solid var(--color-border);
}

.why-clients__label {
	margin: 0 0 var(--space-md);
	font-size: var(--fs-small);
	color: var(--color-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.15em;
	text-align: center;
}

.section__title--plain {
	margin-top: 0;
	font-size: var(--fs-h3);
	color: var(--color-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.15em;
}

.clients-grid--main {
	display: grid;
	grid-template-columns: repeat(5, 1fr);
	gap: var(--space-sm);
	margin-bottom: var(--space-lg);
}

.client-item {
	margin: 0;
	text-align: center;
}

.client-item img {
	width: 100%;
	filter: grayscale(1) brightness(1.4);
	opacity: 0.7;
	transition: filter var(--transition-base), opacity var(--transition-base);
}

.client-item:hover img {
	filter: grayscale(0) brightness(1);
	opacity: 1;
}

.client-item__caption {
	margin-top: var(--space-xs);
	font-size: var(--fs-small);
	color: var(--color-text);
}

.client-item__period {
	display: block;
	color: var(--color-text-muted);
	font-size: 0.75rem;
}

/* marquee — hàng logo nhỏ chạy ngang liên tục, pause khi hover */
.clients-marquee {
	overflow: hidden;
	-webkit-mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
	mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}

.clients-marquee__track {
	display: flex;
	gap: var(--space-lg);
	width: max-content;
	animation: clients-scroll 30s linear infinite;
}

.clients-marquee:hover .clients-marquee__track {
	animation-play-state: paused;
}

/* Ảnh được bọc trong <span> để đánh dấu bản nhân đôi cho screen reader,
   nên span phải là phần tử co giãn của flex track, ảnh lấp đầy span. */
.clients-marquee__track > span {
	flex-shrink: 0;
	line-height: 0;
}

.clients-marquee__track img {
	width: 140px;
	flex-shrink: 0;
	filter: grayscale(1) brightness(1.3);
	opacity: 0.45;
	transition: filter var(--transition-base), opacity var(--transition-base);
}

.clients-marquee__track img:hover {
	opacity: 0.9;
}

@keyframes clients-scroll {
	from { transform: translateX(0); }
	to   { transform: translateX(-50%); } /* track nhân đôi → -50% = 1 vòng trọn */
}

@media (prefers-reduced-motion: reduce) {
	.clients-marquee__track {
		animation: none;
		flex-wrap: wrap;
		width: auto;
	}
}

/* ---------- Why Us (05) ---------- */

.process-strip {
	display: flex;
	flex-wrap: wrap;
	list-style: none;
	margin: 0 0 var(--space-lg);
	padding: 0;
	border: 1px solid var(--color-border);
}

.process-strip__step {
	flex: 1 1 0;
	min-width: 150px;
	padding: var(--space-sm);
	font-size: var(--fs-small);
	color: var(--color-text);
	border-right: 1px solid var(--color-border);
	position: relative;
}

.process-strip__step:last-child {
	border-right: 0;
}

.process-strip__index {
	display: block;
	font-family: var(--font-display);
	font-stretch: var(--font-stretch-display);
	color: var(--color-gold);
	letter-spacing: 0.15em;
	margin-bottom: var(--space-xs);
}

.why-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: var(--space-sm);
}

.why-card {
	padding: var(--space-md);
	border: 1px solid var(--color-border);
	background: var(--color-bg-alt);
	transition: border-color var(--transition-base);
}

.why-card:hover {
	border-color: var(--color-gold);
}

.why-card__stat {
	display: block;
	font-family: var(--font-display);
	font-stretch: var(--font-stretch-display);
	font-weight: 800;
	font-size: var(--fs-h2);
	color: var(--color-gold);
	margin-bottom: var(--space-xs);
}

.why-card__title {
	margin: 0 0 var(--space-xs);
	font-size: var(--fs-h3);
}

.why-card__body {
	margin: 0;
	font-size: var(--fs-small);
}

/* ---------- BTS (band không đánh số) ---------- */

/* Masonry thật bằng CSS columns — ảnh giữ nguyên tỉ lệ gốc nên trộn được ngang/dọc tự nhiên */
.bts-masonry {
	columns: 3 280px;
	column-gap: var(--space-xs);
	margin-bottom: var(--space-md);
}

.bts-masonry img {
	width: 100%;
	height: auto;
	display: block;
	margin-bottom: var(--space-xs);
	border: 1px solid var(--color-border);
	filter: grayscale(0.3);
	transition: filter var(--transition-base), border-color var(--transition-base);
	break-inside: avoid; /* không cho ảnh bị cắt đôi giữa 2 cột */
}

.bts-masonry img:hover {
	filter: grayscale(0);
	border-color: var(--color-gold);
}

.bts-social__hashtag {
	display: block;
	margin-top: var(--space-md);
	font-size: var(--fs-small);
	color: var(--color-text-muted);
	letter-spacing: 0.08em;
}

/* ---------- Blog (04) ---------- */

.blog-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: var(--space-sm);
}

.blog-card {
	display: flex;
	flex-direction: column;
	gap: var(--space-xs);
	padding: var(--space-sm);
	border: 1px solid var(--color-border);
	transition: border-color var(--transition-base);
}

.blog-card:hover,
.blog-card:focus-visible {
	border-color: var(--color-gold);
}

.blog-card__media {
	display: block;
	aspect-ratio: 16 / 9;
	overflow: hidden;
	margin-bottom: var(--space-xs);
}

.blog-card__media img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.blog-card__date {
	font-size: var(--fs-small);
	color: var(--color-gold);
	letter-spacing: 0.08em;
	text-transform: uppercase;
}

.blog-card__title {
	margin: 0;
	font-size: var(--fs-h3);
}

.blog-card__excerpt {
	margin: 0;
	font-size: var(--fs-small);
}

/* ---------- CTA (05) ---------- */

.section--cta {
	text-align: center;
	padding-block: calc(var(--space-xl) * 1.25);
	background: var(--color-bg-alt);
}

.section--cta .section__number {
	text-align: left;
}

.cta__title {
	max-width: 24ch;
	margin-inline: auto;
	margin-bottom: var(--space-md);
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
	.services-grid,
	.blog-grid,
	.clients-grid--main,
	.about-layout,
	.why-grid {
		grid-template-columns: 1fr;
	}

	.service-card,
	.service-card:nth-child(4) {
		grid-column: auto;
	}

	.process-strip {
		flex-direction: column;
	}

	.process-strip__step {
		border-right: 0;
		border-bottom: 1px solid var(--color-border);
	}

	.process-strip__step:last-child {
		border-bottom: 0;
	}
}

/* ---------- Thư viện hậu trường đầy đủ (trang About) ---------- */

/* Thumbnail nhỏ hơn lưới trang chủ (columns 3 280px) để chứa 16–20 ảnh mà trang không dài. */
.bts-gallery {
	columns: 5 180px;
	column-gap: var(--space-xs);
	margin-bottom: var(--space-md);
}

.bts-gallery img {
	width: 100%;
	height: auto;
	display: block;
	margin-bottom: var(--space-xs);
	border: 1px solid var(--color-border);
	filter: grayscale(0.3);
	transition: filter var(--transition-base), border-color var(--transition-base);
	break-inside: avoid; /* không cho ảnh bị cắt đôi giữa 2 cột */
}

.bts-gallery img:hover {
	filter: none;
	border-color: var(--color-gold);
}

/* Dòng CTA: chữ → mũi tên → 4 logo social */
.bts-gallery__cta {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-sm);
}

.bts-gallery__label {
	font-family: var(--font-display);
	font-weight: 600;
	font-size: var(--fs-small);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--color-cream);
}

.bts-gallery__arrow {
	color: var(--color-gold);
	font-size: 1.1rem;
	line-height: 1;
}

.social-icons--gallery .social-icon {
	border-color: transparent;
	color: var(--color-text-muted);
	transition: color var(--transition-base);
}

.social-icons--gallery .social-icon--linkedin:hover  { color: #0a66c2; }
.social-icons--gallery .social-icon--instagram:hover { color: #e4405f; }
.social-icons--gallery .social-icon--facebook:hover  { color: #1877f2; }
.social-icons--gallery .social-icon--youtube:hover   { color: #ff0000; }

.social-icons--gallery .social-icon:hover,
.social-icons--gallery .social-icon:focus-visible {
	background: transparent;
	border-color: transparent;
}

/* Nút "Xem thêm hậu trường" ở trang chủ */
.bts-more {
	margin-bottom: var(--space-md);
}

@media (max-width: 700px) {
	.bts-gallery {
		columns: 3 110px;
	}
}