:root {
	color-scheme: light;
	--ink: #172c3a;
	--muted: #526673;
	--paper: #f5f6f4;
	--card: #ffffff;
	--line: #d8e0dd;
	--accent: #236c63;
	--accent-dark: #174c47;
	--warm: #d77c42;
	--soft-green: #e5efea;
	--soft-blue: #eaf0f3;
	--shadow: 0 18px 48px rgba(24, 52, 62, 0.08);
}

* {
	box-sizing: border-box;
}

html {
	background: var(--paper);
	scroll-behavior: smooth;
}

body {
	margin: 0;
	color: var(--ink);
	font-family: "Segoe UI", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
	font-size: 1rem;
	line-height: 1.7;
}

a {
	color: var(--accent-dark);
	text-decoration-thickness: 1px;
	text-underline-offset: 0.18em;
}

a:hover {
	color: var(--warm);
}

a:focus-visible {
	outline: 3px solid var(--warm);
	outline-offset: 3px;
	border-radius: 2px;
}

code,
pre {
	font-family: Consolas, "SFMono-Regular", Menlo, monospace;
}

code {
	padding: 0.08em 0.32em;
	border: 1px solid #dfe5e2;
	border-radius: 4px;
	background: #f3f6f4;
	font-size: 0.9em;
	word-break: break-word;
}

.shell {
	width: min(1120px, calc(100% - 48px));
	margin-inline: auto;
}

.site-header {
	position: relative;
	z-index: 1;
	border-bottom: 1px solid rgba(23, 44, 58, 0.1);
	background: rgba(255, 255, 255, 0.9);
}

.header-inner,
.main-nav,
.hero-actions,
.footer-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
}

.header-inner {
	min-height: 78px;
	gap: 32px;
}

.wordmark {
	display: inline-flex;
	align-items: baseline;
	gap: 12px;
	color: var(--ink);
	font-size: 1.15rem;
	font-weight: 750;
	letter-spacing: -0.04em;
	text-decoration: none;
}

.wordmark span {
	color: var(--muted);
	font-size: 0.72rem;
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
}

.main-nav {
	justify-content: flex-end;
	gap: clamp(16px, 3vw, 34px);
	font-size: 0.92rem;
}

.main-nav a {
	color: var(--muted);
	text-decoration: none;
}

.main-nav a[aria-current="page"] {
	color: var(--accent-dark);
	font-weight: 700;
}

.main-nav a:hover,
.footer-links a:hover {
	color: var(--warm);
}

.language-link {
	padding-left: clamp(12px, 2vw, 22px);
	border-left: 1px solid var(--line);
	color: var(--accent-dark) !important;
	font-weight: 650;
}

.page-main {
	padding-block: 62px 76px;
}

.hero {
	position: relative;
	max-width: 900px;
	padding: 40px 0 64px;
}

.hero::before {
	position: absolute;
	z-index: -1;
	top: 10px;
	left: -38px;
	width: 170px;
	height: 170px;
	border: 1px solid rgba(35, 108, 99, 0.18);
	border-radius: 50%;
	content: "";
}

.eyebrow,
.step-label {
	margin: 0 0 12px;
	color: var(--accent);
	font-size: 0.75rem;
	font-weight: 800;
	letter-spacing: 0.13em;
	line-height: 1.4;
	text-transform: uppercase;
}

h1,
h2,
h3,
p {
	margin-top: 0;
}

h1,
h2,
h3 {
	color: var(--ink);
	line-height: 1.2;
}

h1 {
	max-width: 850px;
	margin-bottom: 22px;
	font-size: clamp(2.5rem, 6.5vw, 5.6rem);
	font-weight: 760;
	letter-spacing: -0.065em;
}

h2 {
	margin-bottom: 16px;
	font-size: clamp(1.75rem, 3.8vw, 2.65rem);
	font-weight: 730;
	letter-spacing: -0.045em;
}

h3 {
	margin-bottom: 10px;
	font-size: 1.13rem;
	font-weight: 720;
	letter-spacing: -0.025em;
}

p {
	margin-bottom: 16px;
}

.attribution {
	max-width: 850px;
	margin-bottom: 18px;
	padding: 13px 17px;
	border-left: 3px solid var(--warm);
	background: rgba(255, 255, 255, 0.68);
	color: var(--muted);
	font-size: 0.96rem;
}

.attribution a {
	font-weight: 650;
}

.lead {
	max-width: 820px;
	margin-bottom: 26px;
	color: #344d59;
	font-size: clamp(1.13rem, 2vw, 1.42rem);
	line-height: 1.65;
}

.hero-actions {
	justify-content: flex-start;
	flex-wrap: wrap;
	gap: 12px;
	margin: 30px 0 20px;
}

.button {
	display: inline-flex;
	min-height: 48px;
	align-items: center;
	justify-content: center;
	padding: 11px 18px;
	border: 1px solid transparent;
	border-radius: 7px;
	font-size: 0.92rem;
	font-weight: 700;
	text-decoration: none;
	transition: transform 150ms ease, background-color 150ms ease, border-color 150ms ease;
}

.button:hover {
	transform: translateY(-1px);
}

.button-primary {
	background: var(--accent-dark);
	color: #fff;
}

.button-primary:hover {
	background: #103b38;
	color: #fff;
}

.button-secondary {
	border-color: var(--line);
	background: #fff;
	color: var(--ink);
}

.button-secondary:hover {
	border-color: var(--accent);
	color: var(--accent-dark);
}

.hero-note,
.section-note,
.review-note {
	color: var(--muted);
	font-size: 0.88rem;
}

.hero-note {
	max-width: 700px;
	margin-bottom: 0;
}

.content-section {
	margin-top: 30px;
	padding-block: 52px;
	border-top: 1px solid var(--line);
}

.section-heading {
	max-width: 780px;
	margin-bottom: 26px;
}

.section-heading > p:last-child {
	max-width: 700px;
	margin-bottom: 0;
	color: var(--muted);
	font-size: 1.08rem;
}

.table-wrap {
	overflow-x: auto;
	border: 1px solid var(--line);
	border-radius: 10px;
	background: var(--card);
	box-shadow: var(--shadow);
}

table {
	width: 100%;
	border-collapse: collapse;
	text-align: left;
}

th,
td {
	padding: 17px 20px;
	border-bottom: 1px solid var(--line);
	vertical-align: top;
}

thead th {
	background: var(--soft-blue);
	color: var(--ink);
	font-size: 0.8rem;
	letter-spacing: 0.06em;
	text-transform: uppercase;
}

tbody tr:last-child th,
tbody tr:last-child td {
	border-bottom: 0;
}

tbody th {
	width: 25%;
	font-size: 0.96rem;
	font-weight: 730;
}

td {
	color: #3b525d;
}

.section-note {
	margin: 17px 0 0;
}

.fact-grid,
.callout-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 16px;
	margin-top: 27px;
}

.fact-card,
.callout {
	padding: 23px 24px;
	border: 1px solid var(--line);
	border-radius: 10px;
	background: var(--card);
}

.fact-card p,
.callout p {
	margin-bottom: 0;
	color: var(--muted);
}

.split-section {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(300px, 0.78fr);
	align-items: center;
	gap: clamp(32px, 7vw, 90px);
}

.split-section > div > p:last-child {
	margin-bottom: 0;
	color: var(--muted);
}

.requirements-card {
	padding: 28px 30px;
	border: 1px solid #d4e2dc;
	border-radius: 12px;
	background: var(--soft-green);
}

.requirements-card h3 {
	margin-bottom: 16px;
}

.requirements-card ul,
.check-list {
	margin: 0;
	padding-left: 1.25rem;
}

.requirements-card li,
.check-list li {
	margin: 0 0 10px;
	padding-left: 2px;
}

.requirements-card li:last-child,
.check-list li:last-child {
	margin-bottom: 0;
}

.faq-section {
	padding-bottom: 36px;
}

.faq-list {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 0 34px;
}

.faq-item {
	padding: 23px 0;
	border-top: 1px solid var(--line);
}

.faq-item p {
	margin-bottom: 0;
	color: var(--muted);
}

.closing-panel {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 28px;
	margin-top: 18px;
	padding: clamp(26px, 5vw, 44px);
	border-radius: 14px;
	background: var(--accent-dark);
	color: #e2efeb;
}

.closing-panel .eyebrow {
	color: #a9d6c9;
}

.closing-panel h2 {
	max-width: 680px;
	margin-bottom: 10px;
	color: #fff;
	font-size: clamp(1.55rem, 3vw, 2.2rem);
}

.closing-panel p:last-child {
	max-width: 650px;
	margin-bottom: 0;
	color: #c4d9d4;
}

.button-light {
	flex: 0 0 auto;
	background: #fff;
	color: var(--accent-dark);
}

.button-light:hover {
	background: #eaf4ef;
	color: var(--accent-dark);
}

.guide-main {
	max-width: 940px;
}

.page-intro {
	max-width: 840px;
	padding: 22px 0 34px;
}

.page-intro h1 {
	font-size: clamp(2.5rem, 6vw, 4.5rem);
}

.page-intro .lead {
	max-width: 790px;
}

.notice {
	margin: 25px 0 0;
	padding: 17px 19px;
	border: 1px solid #e8c9ab;
	border-radius: 8px;
	background: #fff8f1;
	color: #61452f;
}

.notice strong {
	color: #4d3422;
}

.guide-section {
	padding: 38px 0 42px;
	border-top: 1px solid var(--line);
}

.guide-section > p:not(.step-label) {
	max-width: 800px;
	color: var(--muted);
}

.guide-section > h2 {
	max-width: 820px;
	font-size: clamp(1.65rem, 3.5vw, 2.35rem);
}

.step-label {
	margin-bottom: 9px;
}

.check-list {
	max-width: 820px;
	color: #3b525d;
}

pre {
	overflow-x: auto;
	margin: 22px 0 18px;
	padding: 20px 22px;
	border: 1px solid #28424d;
	border-radius: 9px;
	background: #172c3a;
	color: #f0f5f2;
	font-size: 0.9rem;
	line-height: 1.7;
	tab-size: 4;
}

pre code {
	padding: 0;
	border: 0;
	background: transparent;
	color: inherit;
	font-size: inherit;
	word-break: normal;
}

.callout-grid {
	margin: 20px 0;
}

.callout {
	background: var(--soft-green);
}

.callout-muted {
	background: #f0f3f4;
}

.callout h3 {
	font-size: 1rem;
}

.source-table-wrap {
	margin: 22px 0;
}

.source-table-wrap tbody th {
	width: 38%;
}

.source-table-wrap th,
.source-table-wrap td {
	padding: 14px 16px;
	font-size: 0.9rem;
}

.live-guide {
	margin: 4px -24px 0;
	padding: 35px 24px 38px;
	border: 1px solid #e8c9ab;
	border-radius: 10px;
	background: #fff9f2;
}

blockquote {
	margin: 21px 0;
	padding: 18px 22px;
	border-left: 3px solid var(--warm);
	background: #fff;
	color: var(--ink);
	font-size: 1.08rem;
}

.source-notes {
	padding-bottom: 12px;
}

.site-footer {
	border-top: 1px solid var(--line);
	background: #edf1ef;
}

.footer-inner {
	align-items: flex-start;
	gap: 42px;
	padding-block: 35px 38px;
}

.footer-brand {
	color: var(--ink);
	font-weight: 760;
	text-decoration: none;
}

.footer-inner > div {
	max-width: 430px;
}

.footer-inner > div p {
	margin: 8px 0 0;
	color: var(--muted);
	font-size: 0.88rem;
}

.review-note {
	font-size: 0.78rem !important;
}

.footer-links {
	display: grid;
	grid-template-columns: repeat(2, max-content);
	gap: 9px 24px;
	font-size: 0.86rem;
}

.footer-links a {
	color: var(--muted);
	text-decoration: none;
}

@media (max-width: 760px) {
	.shell {
		width: min(100% - 32px, 620px);
	}

	.header-inner {
		min-height: 70px;
		align-items: flex-start;
		flex-direction: column;
		gap: 10px;
		padding-block: 14px;
	}

	.main-nav {
		width: 100%;
		justify-content: flex-start;
		gap: 20px;
		font-size: 0.84rem;
	}

	.language-link {
		margin-left: auto;
	}

	.page-main {
		padding-block: 32px 50px;
	}

	.hero {
		padding: 25px 0 42px;
	}

	.hero::before {
		top: 0;
		left: auto;
		right: -8px;
		width: 90px;
		height: 90px;
	}

	.content-section {
		padding-block: 38px;
	}

	.split-section,
	.faq-list,
	.fact-grid,
	.callout-grid {
		grid-template-columns: 1fr;
	}

	.split-section {
		gap: 25px;
	}

	.closing-panel,
	.footer-inner {
		align-items: flex-start;
		flex-direction: column;
	}

	.footer-inner {
		gap: 25px;
	}

	.footer-links {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		gap: 11px 18px;
	}

	.live-guide {
		margin-inline: 0;
		padding-inline: 18px;
	}

	th,
	td {
		padding: 14px 15px;
	}

	tbody th {
		min-width: 150px;
	}
}

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

	.button {
		transition: none;
	}
}