/* 关于我们页（对齐 yahe/about-us.html，仅作用于 .site-page-about） */

.site-page-about {
	--ink: #12161b;
	--graphite: #232b33;
	--steel: #6d7681;
	--steel-line: rgba(255, 255, 255, 0.12);
	--paper: #eff1f1;
	--paper-dim: #e4e7e7;
	--white: #ffffff;
	--navy: #1d6fb8;
	--navy-deep: #123c6e;
	--brand-a: #2e8fd1;
	--brand-b: #14336b;
	--brand-grad: linear-gradient(135deg, var(--brand-a) 0%, var(--navy) 46%, var(--brand-b) 100%);
	--signal: #f2b705;
	--max: 1450px;
	--display: "Oswald", sans-serif;
	--body: "Inter", sans-serif;
	--mono: "IBM Plex Mono", monospace;
	font-family: var(--body);
	color: var(--ink);
	background: var(--paper);
	line-height: 1.55;
}

.site-page-about img {
	max-width: 100%;
	display: block;
}

.site-page-about a {
	color: inherit;
	text-decoration: none;
}

.site-page-about .wrap {
	max-width: var(--max);
	margin: 0 auto;
	padding: 0 40px;
}

.site-page-about h1,
.site-page-about h2,
.site-page-about h3,
.site-page-about h4 {
	font-family: var(--display);
	text-transform: uppercase;
	font-weight: 600;
	letter-spacing: 0.01em;
	line-height: 1.08;
	margin: 0;
}

.site-page-about .btn {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	font-family: var(--mono);
	font-size: 13px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	padding: 15px 28px;
	border: 1.5px solid var(--ink);
	background: transparent;
	color: var(--ink);
	cursor: pointer;
	transition: 0.25s ease;
	white-space: nowrap;
}

.site-page-about .btn:hover {
	background: var(--ink);
	color: var(--white);
}

.site-page-about .btn.solid {
	background: var(--brand-grad);
	border-color: var(--navy);
	color: var(--white);
}

.site-page-about .btn.solid:hover {
	background: var(--navy-deep);
	border-color: var(--navy-deep);
}

/* ---- Page hero ---- */
.site-page-about .page-hero {
	position: relative;
	/* banner 延伸至顶栏下，顶部含导航高度（对齐静态页 160px） */
	padding: 160px 0 72px;
	overflow: hidden;
	background-color: var(--ink);
	background-size: cover;
	background-position: center;
}

.site-page-about .page-hero::before {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(90deg, rgba(18, 22, 27, 0.86) 0%, rgba(18, 22, 27, 0.6) 50%, rgba(18, 22, 27, 0.22) 100%);
	z-index: 0;
}

.site-page-about .page-hero::after {
	content: "";
	position: absolute;
	right: -140px;
	top: -140px;
	width: 460px;
	height: 460px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.08);
	z-index: 0;
}

.site-page-about .page-hero .crumb {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: rgba(255, 255, 255, 0.5);
	display: flex;
	gap: 10px;
	align-items: center;
	margin-bottom: 20px;
	position: relative;
	z-index: 1;
	flex-wrap: wrap;
}

.site-page-about .page-hero .crumb a {
	color: rgba(255, 255, 255, 0.5);
	transition: 0.2s;
}

.site-page-about .page-hero .crumb a:hover {
	color: var(--signal);
}

.site-page-about .page-hero .crumb span {
	color: rgba(255, 255, 255, 0.25);
}

.site-page-about .page-hero .crumb .now {
	color: var(--signal);
}

.site-page-about .page-hero .eyebrow {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--signal);
	display: flex;
	align-items: center;
	gap: 10px;
	margin-bottom: 14px;
	position: relative;
	z-index: 1;
}

.site-page-about .page-hero .eyebrow::before {
	content: "";
	width: 26px;
	height: 2px;
	background: var(--signal);
}

.site-page-about .page-hero h1 {
	color: var(--white);
	font-size: clamp(30px, 3.8vw, 50px);
	position: relative;
	z-index: 1;
}

.site-page-about .page-hero p {
	color: rgba(255, 255, 255, 0.66);
	max-width: 580px;
	margin-top: 16px;
	font-size: 15px;
	position: relative;
	z-index: 1;
}

/* ---- Intro ---- */
.site-page-about #intro {
	background: var(--white);
	padding: 100px 0;
}

.site-page-about .about-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 64px;
	align-items: center;
}

.site-page-about .about-visual {
	position: relative;
}

.site-page-about .about-visual .main {
	aspect-ratio: 16 / 11;
	overflow: hidden;
	border-radius: 6px;
	box-shadow: 0 18px 40px rgba(0, 0, 0, 0.1);
}

.site-page-about .about-visual .main img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.7s ease;
}

.site-page-about .about-visual:hover .main img {
	transform: scale(1.05);
}

.site-page-about .about-visual .float {
	position: absolute;
	left: -26px;
	bottom: -26px;
	background: var(--brand-grad);
	color: var(--white);
	padding: 22px 28px;
	box-shadow: 0 14px 30px rgba(18, 22, 27, 0.25);
}

.site-page-about .about-visual .float .n {
	font-family: var(--display);
	font-size: 38px;
	font-weight: 700;
	line-height: 1;
}

.site-page-about .about-visual .float .l {
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: rgba(255, 255, 255, 0.75);
	margin-top: 6px;
}

.site-page-about .about-copy .eyebrow {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--navy);
	display: flex;
	align-items: center;
	gap: 10px;
	margin-bottom: 16px;
}

.site-page-about .about-copy .eyebrow::before {
	content: "";
	width: 26px;
	height: 2px;
	background: var(--signal);
}

.site-page-about .about-copy h2 {
	font-size: clamp(28px, 3.2vw, 42px);
	margin-bottom: 22px;
	color: var(--ink);
}

.site-page-about .about-copy p {
	color: var(--steel);
	font-size: 15px;
	line-height: 1.7;
	margin: 0 0 18px;
}

.site-page-about .about-copy-body > *:last-child {
	margin-bottom: 0;
}

.site-page-about .certs {
	display: flex;
	gap: 12px;
	flex-wrap: wrap;
	margin-top: 26px;
}

.site-page-about .certs span {
	font-family: var(--mono);
	font-size: 12px;
	border: 1px solid var(--paper-dim);
	padding: 7px 16px;
	color: var(--steel);
	letter-spacing: 0.05em;
	border-radius: 4px;
	transition: 0.25s;
}

.site-page-about .certs span:hover {
	border-color: var(--navy);
	color: var(--navy);
}

/* ---- Stats ---- */
.site-page-about #stats {
	position: relative;
	padding: 110px 0;
	overflow: hidden;
	background-color: var(--ink);
	background-size: cover;
	background-position: center;
	background-attachment: fixed;
}

.site-page-about #stats::before {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(180deg, rgba(18, 22, 27, 0.82) 0%, rgba(18, 22, 27, 0.7) 100%);
	z-index: 0;
}

.site-page-about #stats::after {
	content: "";
	position: absolute;
	left: -120px;
	bottom: -120px;
	width: 420px;
	height: 420px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.1);
	z-index: 0;
}

.site-page-about .stats-grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1px;
	background: rgba(255, 255, 255, 0.1);
	border: 1px solid rgba(255, 255, 255, 0.1);
	position: relative;
	z-index: 1;
}

.site-page-about .stats-grid .stats-item {
	background: rgba(18, 22, 27, 0.45);
	-webkit-backdrop-filter: blur(3px);
	backdrop-filter: blur(3px);
	padding: 44px 24px;
	text-align: center;
	transition: 0.35s;
	box-sizing: border-box;
	margin: 0;
}

.site-page-about .stats-grid .stats-item:hover {
	background: rgba(18, 22, 27, 0.72);
}

.site-page-about .stats-grid .n {
	font-family: var(--display);
	font-size: clamp(34px, 3.4vw, 50px);
	font-weight: 700;
	color: var(--white);
	line-height: 1;
	letter-spacing: 0;
	margin: 0;
	padding: 44px 24px;
	background: rgba(18, 22, 27, 0.45);
	-webkit-backdrop-filter: blur(3px);
	backdrop-filter: blur(3px);
	text-align: center;
	transition: 0.35s;
	white-space: nowrap;
}

.site-page-about .stats-grid .n em {
	font-style: normal;
	font-family: inherit;
	font-size: inherit;
	font-weight: inherit;
	line-height: inherit;
	color: var(--signal);
	margin: 0;
	padding: 0;
	letter-spacing: 0;
}

.site-page-about .stats-grid .l {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: rgba(255, 255, 255, 0.62);
	margin: 12px 0 0;
	padding: 44px 24px;
	background: rgba(18, 22, 27, 0.45);
	-webkit-backdrop-filter: blur(3px);
	backdrop-filter: blur(3px);
	text-align: center;
	transition: 0.35s;
	line-height: 1.4;
}

/* ---- Section heads ---- */
.site-page-about .sec-head {
	text-align: center;
	margin-bottom: 64px;
}

.site-page-about .sec-head .eyebrow {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--navy);
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 10px;
	margin-bottom: 14px;
}

.site-page-about .sec-head .eyebrow::before,
.site-page-about .sec-head .eyebrow::after {
	content: "";
	width: 26px;
	height: 2px;
	background: var(--signal);
}

.site-page-about .sec-head h2 {
	font-size: clamp(26px, 3vw, 40px);
}

.site-page-about .sec-head .desc {
	color: var(--steel);
	max-width: 520px;
	margin: 16px auto 0;
	font-size: 15px;
}

/* ---- Milestones ---- */
.site-page-about #milestones {
	background: var(--paper);
	padding: 100px 0;
}

.site-page-about .timeline {
	position: relative;
	max-width: 980px;
	margin: 0 auto;
}

.site-page-about .timeline::before {
	content: "";
	position: absolute;
	left: 50%;
	top: 6px;
	bottom: 6px;
	width: 2px;
	background: var(--paper-dim);
	transform: translateX(-50%);
}

.site-page-about .tl-item {
	position: relative;
	width: 50%;
	padding: 0 52px 58px;
}

.site-page-about .tl-item:nth-child(odd) {
	left: 0;
	text-align: right;
}

.site-page-about .tl-item:nth-child(even) {
	left: 50%;
	text-align: left;
}

.site-page-about .tl-item:last-child {
	padding-bottom: 0;
}

.site-page-about .tl-item .dot {
	position: absolute;
	top: 4px;
	width: 15px;
	height: 15px;
	border-radius: 50%;
	background: var(--signal);
	border: 3px solid var(--white);
	box-shadow: 0 0 0 2px var(--navy);
}

.site-page-about .tl-item:nth-child(odd) .dot {
	right: -7px;
}

.site-page-about .tl-item:nth-child(even) .dot {
	left: -7px;
}

.site-page-about .tl-item .year {
	font-family: var(--mono);
	font-size: 12.5px;
	letter-spacing: 0.14em;
	color: var(--navy);
	text-transform: uppercase;
}

.site-page-about .tl-item h4 {
	font-size: 19px;
	margin: 9px 0 10px;
	color: var(--ink);
}

.site-page-about .tl-item p {
	font-size: 14px;
	color: var(--steel);
	line-height: 1.6;
	margin: 0;
}

/* ---- Workshops ---- */
.site-page-about #workshops {
	background: var(--white);
	padding: 100px 0;
}

.site-page-about .ws-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 24px;
}

.site-page-about .ws-card {
	background: var(--paper);
	border: 1px solid var(--paper-dim);
	padding: 36px 30px;
	position: relative;
	overflow: hidden;
	transition: 0.35s;
}

.site-page-about .ws-card::before {
	content: "";
	position: absolute;
	left: 0;
	top: 0;
	right: 0;
	height: 3px;
	background: var(--brand-grad);
	transform: scaleX(0);
	transform-origin: left;
	transition: 0.4s;
}

.site-page-about .ws-card:hover::before {
	transform: scaleX(1);
}

.site-page-about .ws-card:hover {
	background: var(--white);
	box-shadow: 0 14px 32px rgba(0, 0, 0, 0.08);
	transform: translateY(-5px);
}

.site-page-about .ws-card .n {
	font-family: var(--mono);
	font-size: 12px;
	color: var(--signal);
	display: block;
	margin-bottom: 16px;
}

.site-page-about .ws-card h4 {
	font-size: 17px;
	margin-bottom: 10px;
}

.site-page-about .ws-card p {
	font-size: 13.5px;
	color: var(--steel);
	margin: 0;
}

.site-page-about .ws-card .tag {
	display: inline-block;
	margin-top: 16px;
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	color: var(--navy);
	text-transform: uppercase;
}

/* ---- Gallery ---- */
.site-page-about #gallery {
	background: var(--ink);
	padding: 100px 0;
	position: relative;
	overflow: hidden;
}

.site-page-about #gallery::before {
	content: "";
	position: absolute;
	right: -140px;
	top: -140px;
	width: 460px;
	height: 460px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.06);
}

.site-page-about .gal-head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	margin-bottom: 48px;
	gap: 30px;
	flex-wrap: wrap;
	position: relative;
	z-index: 1;
}

.site-page-about .gal-head .eyebrow {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--signal);
	display: flex;
	align-items: center;
	gap: 10px;
	margin-bottom: 14px;
}

.site-page-about .gal-head .eyebrow::before {
	content: "";
	width: 26px;
	height: 2px;
	background: var(--signal);
}

.site-page-about .gal-head h2 {
	color: var(--white);
	font-size: clamp(26px, 3vw, 40px);
}

.site-page-about .gal-head .desc {
	color: rgba(255, 255, 255, 0.6);
	max-width: 420px;
	font-size: 15px;
	margin: 0;
}

.site-page-about .gal-stage {
	display: flex;
	align-items: center;
	gap: 18px;
	position: relative;
	z-index: 1;
}

.site-page-about .gal-btn {
	width: 52px;
	height: 52px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.25);
	background: rgba(255, 255, 255, 0.06);
	color: var(--white);
	font-size: 22px;
	cursor: pointer;
	flex-shrink: 0;
	transition: 0.3s;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 0;
}

.site-page-about .gal-btn:hover {
	background: var(--signal);
	border-color: var(--signal);
	color: var(--ink);
}

.site-page-about .gal-viewport {
	flex: 1;
	position: relative;
	overflow: hidden;
	border-radius: 8px;
	aspect-ratio: 8 / 5;
	background: var(--graphite);
	box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.site-page-about .gal-track {
	display: flex;
	height: 100%;
	transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.site-page-about .gal-slide {
	flex: 0 0 100%;
	height: 100%;
	position: relative;
}

.site-page-about .gal-slide img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.site-page-about .gal-slide .cap {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	padding: 44px 28px 20px;
	background: linear-gradient(180deg, rgba(18, 22, 27, 0) 0%, rgba(18, 22, 27, 0.85) 100%);
	color: var(--white);
	font-family: var(--display);
	font-size: 17px;
	letter-spacing: 0.03em;
	text-transform: uppercase;
}

.site-page-about .gal-count {
	position: absolute;
	top: 18px;
	right: 20px;
	font-family: var(--mono);
	font-size: 13px;
	letter-spacing: 0.12em;
	color: rgba(255, 255, 255, 0.85);
	background: rgba(18, 22, 27, 0.55);
	backdrop-filter: blur(4px);
	padding: 8px 14px;
	border-radius: 4px;
}

.site-page-about .gal-count b {
	color: var(--signal);
}

.site-page-about .gal-thumbs-stage {
	margin-top: 22px;
	position: relative;
	z-index: 1;
}

.site-page-about .gal-thumbs-viewport {
	width: 100%;
	overflow: hidden;
}

.site-page-about .gal-thumbs-track {
	display: flex;
	align-items: stretch;
	transition: transform 0.45s cubic-bezier(0.25, 1, 0.5, 1);
	will-change: transform;
}

.site-page-about .gal-thumb {
	aspect-ratio: 8 / 5;
	overflow: hidden;
	border: 2px solid transparent;
	border-radius: 6px;
	cursor: pointer;
	opacity: 0.55;
	transition: opacity 0.3s, border-color 0.3s;
	padding: 0;
	background: var(--graphite);
	box-sizing: border-box;
}

.site-page-about .gal-thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.site-page-about .gal-thumb:hover {
	opacity: 0.85;
}

.site-page-about .gal-thumb.active {
	opacity: 1;
	border-color: var(--signal);
}

/* ---- Values ---- */
.site-page-about #values {
	background: var(--brand-grad);
	color: var(--white);
	padding: 100px 0;
	position: relative;
	overflow: hidden;
}

.site-page-about #values::before {
	content: "";
	position: absolute;
	right: -140px;
	top: -140px;
	width: 480px;
	height: 480px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.1);
}

.site-page-about #values .sec-head .eyebrow {
	color: var(--signal);
}

.site-page-about #values .sec-head .eyebrow::before,
.site-page-about #values .sec-head .eyebrow::after {
	background: var(--signal);
}

.site-page-about #values .sec-head h2 {
	color: var(--white);
}

.site-page-about #values .sec-head .desc {
	color: rgba(255, 255, 255, 0.65);
}

.site-page-about .val-grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1px;
	background: rgba(255, 255, 255, 0.14);
	border: 1px solid rgba(255, 255, 255, 0.14);
	position: relative;
	z-index: 1;
}

.site-page-about .val-card {
	background: rgba(18, 22, 27, 0.28);
	backdrop-filter: blur(4px);
	padding: 36px 28px;
	transition: 0.35s;
}

.site-page-about .val-card:hover {
	background: rgba(18, 22, 27, 0.55);
}

.site-page-about .val-card .n {
	font-family: var(--mono);
	font-size: 12px;
	color: var(--signal);
	display: block;
	margin-bottom: 16px;
}

.site-page-about .val-card h4 {
	font-size: 17px;
	margin-bottom: 10px;
	color: var(--white);
}

.site-page-about .val-card p {
	font-size: 13.5px;
	color: rgba(255, 255, 255, 0.65);
	margin: 0;
}

/* ---- CTA ---- */
.site-page-about #cta {
	background: var(--paper);
	padding: 90px 0;
	text-align: center;
}

.site-page-about #cta h2 {
	font-size: clamp(26px, 3vw, 40px);
	margin-bottom: 14px;
}

.site-page-about #cta p {
	color: var(--steel);
	max-width: 480px;
	margin: 0 auto 30px;
	font-size: 15px;
}

.site-page-about #cta .btns {
	display: flex;
	gap: 14px;
	justify-content: center;
	flex-wrap: wrap;
}

/* ---- Responsive ---- */
@media (max-width: 1100px) {
	.site-page-about .about-grid {
		grid-template-columns: 1fr;
		gap: 44px;
	}

	.site-page-about .about-visual .float {
		left: 14px;
		bottom: 14px;
	}

	.site-page-about .ws-grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.site-page-about .val-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 900px) {
	.site-page-about .stats-grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.site-page-about .timeline::before {
		left: 9px;
		transform: none;
	}

	.site-page-about .tl-item,
	.site-page-about .tl-item:nth-child(odd),
	.site-page-about .tl-item:nth-child(even) {
		width: 100%;
		left: 0;
		text-align: left;
		padding: 0 0 40px 40px;
	}

	.site-page-about .tl-item .dot,
	.site-page-about .tl-item:nth-child(odd) .dot,
	.site-page-about .tl-item:nth-child(even) .dot {
		left: 2px;
		right: auto;
	}
}

@media (max-width: 768px) {
	.site-page-about #intro,
	.site-page-about #milestones,
	.site-page-about #workshops,
	.site-page-about #gallery,
	.site-page-about #values,
	.site-page-about #cta {
		padding: 40px 0;
	}

	.site-page-about #stats {
		padding: 48px 0;
	}

	.site-page-about .sec-head {
		margin-bottom: 28px;
	}

	.site-page-about .about-grid {
		gap: 28px;
	}

	.site-page-about .stats-grid .stats-item {
		padding: 20px;
	}

	.site-page-about .stats-grid .n,
	.site-page-about .stats-grid .l {
		padding: 20px;
	}

	.site-page-about .stats-grid .l {
		margin-top: 20px;
	}

	.site-page-about .gal-stage {
		position: relative;
		gap: 0;
	}

	.site-page-about .gal-viewport {
		width: 100%;
	}

	.site-page-about .gal-btn {
		position: absolute;
		top: 50%;
		z-index: 2;
		transform: translateY(-50%);
		width: 40px;
		height: 40px;
		font-size: 17px;
		background: rgba(18, 22, 27, 0.55);
		border-color: rgba(255, 255, 255, 0.35);
		backdrop-filter: blur(4px);
	}

	.site-page-about .gal-btn#galPrev {
		left: 10px;
	}

	.site-page-about .gal-btn#galNext {
		right: 10px;
	}
}

@media (max-width: 680px) {
	.site-page-about .wrap {
		padding: 0 22px;
	}

	.site-page-about #intro,
	.site-page-about #milestones,
	.site-page-about #workshops,
	.site-page-about #gallery,
	.site-page-about #values,
	.site-page-about #cta {
		padding: 32px 0;
	}

	.site-page-about #stats {
		padding: 40px 0;
		background-attachment: scroll;
	}

	.site-page-about .sec-head {
		margin-bottom: 22px;
	}

	.site-page-about .ws-grid {
		grid-template-columns: 1fr;
	}

	.site-page-about .val-grid {
		grid-template-columns: 1fr;
	}

	.site-page-about .gal-slide .cap {
		padding: 28px 16px 14px;
		font-size: 14px;
	}

	.site-page-about .tl-item,
	.site-page-about .tl-item:nth-child(odd),
	.site-page-about .tl-item:nth-child(even) {
		padding-bottom: 28px;
	}
}

@media (max-width: 480px) {
	.site-page-about .stats-grid {
		grid-template-columns: 1fr;
	}
}