/* ==========================================================================
   theme.css — 苏打聚合平台 前端主题（简约商务风）
   自包含设计系统：不含任何外部依赖，替代原 Bootstrap 4 + 旧 style.css
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
	--brand: #2563eb;
	--brand-dark: #1d4ed8;
	--brand-deep: #1e3a8a;
	--brand-soft: #eff6ff;
	--brand-line: #dbeafe;

	--ink: #0f172a;
	--ink-2: #334155;
	--ink-3: #475569;
	--muted: #64748b;
	--muted-2: #94a3b8;

	--line: #e5e9f0;
	--line-soft: #eef2f7;
	--bg: #ffffff;
	--bg-2: #f7f9fc;
	--bg-3: #f1f5f9;

	--ok: #059669;
	--warn: #d97706;

	--radius-sm: 8px;
	--radius: 12px;
	--radius-lg: 18px;

	--shadow-xs: 0 1px 2px rgba(15, 23, 42, .05);
	--shadow-sm: 0 2px 8px rgba(15, 23, 42, .05);
	--shadow: 0 6px 20px rgba(15, 23, 42, .07);
	--shadow-lg: 0 18px 44px rgba(15, 23, 42, .10);

	--container: 1140px;
	--header-h: 66px;
	--font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
	margin: 0;
	font-family: var(--font);
	font-size: 15px;
	line-height: 1.7;
	color: var(--ink-2);
	background: var(--bg);
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 { margin: 0 0 .6em; color: var(--ink); font-weight: 600; line-height: 1.35; }
h1 { font-size: 2.35rem; letter-spacing: -.02em; }
h2 { font-size: 1.75rem; letter-spacing: -.01em; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: var(--brand); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; height: auto; border: 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }
ul, ol { margin: 0 0 1em; padding-left: 1.2rem; }

code, pre, kbd {
	font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
	font-size: .875em;
}
code {
	background: var(--bg-3);
	color: #be185d;
	padding: .15em .45em;
	border-radius: 6px;
	word-break: break-all;
}
pre {
	background: #0f172a;
	color: #e2e8f0;
	padding: 1rem 1.15rem;
	border-radius: var(--radius);
	overflow-x: auto;
	line-height: 1.65;
	margin: 0 0 1.25rem;
}
pre code { background: none; color: inherit; padding: 0; }

/* ---------- 3. 布局容器与栅格 ---------- */
.container {
	width: 100%;
	max-width: var(--container);
	margin: 0 auto;
	padding: 0 20px;
}
.container-narrow { max-width: 880px; }

.row { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.row > [class*="col-"] { padding: 0 12px; box-sizing: border-box; }
.col-md-3 { flex: 0 0 25%; max-width: 25%; }
.col-md-4 { flex: 0 0 33.3333%; max-width: 33.3333%; }
.col-md-6 { flex: 0 0 50%; max-width: 50%; }
.col-md-8 { flex: 0 0 66.6667%; max-width: 66.6667%; }
.col-md-9 { flex: 0 0 75%; max-width: 75%; }

/* ---------- 4. 顶部导航 ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 1000;
	height: var(--header-h);
	display: flex;
	align-items: center;
	background: rgba(255, 255, 255, .88);
	-webkit-backdrop-filter: saturate(180%) blur(12px);
	backdrop-filter: saturate(180%) blur(12px);
	border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; gap: 16px; }

.site-brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-size: 1.06rem;
	font-weight: 700;
	color: var(--ink);
	letter-spacing: -.01em;
	white-space: nowrap;
}
.site-brand:hover { color: var(--brand); }
/* 说明：站点 Logo 本身是白色透明图，因此在浅色底上需加品牌色底片才能显示 */
.site-brand img {
	width: 34px;
	height: 34px;
	object-fit: contain;
	border-radius: 9px;
	padding: 6px;
	background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
	box-shadow: 0 3px 9px rgba(37, 99, 235, .28);
}

.site-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.site-nav a {
	display: inline-block;
	padding: 8px 14px;
	border-radius: 8px;
	font-size: .94rem;
	color: var(--ink-3);
	font-weight: 500;
	transition: background .18s ease, color .18s ease;
}
.site-nav a:hover { background: var(--bg-3); color: var(--ink); }
.site-nav a.is-active { color: var(--brand); background: var(--brand-soft); }
.site-nav a.nav-cta {
	background: var(--brand);
	color: #fff;
	padding: 8px 18px;
	margin-left: 6px;
}
.site-nav a.nav-cta:hover { background: var(--brand-dark); color: #fff; }

.nav-toggle {
	display: none;
	margin-left: auto;
	width: 42px; height: 38px;
	border: 1px solid var(--line);
	border-radius: 8px;
	background: #fff;
	cursor: pointer;
	padding: 0;
	align-items: center;
	justify-content: center;
	color: var(--ink-3);
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
	content: "";
	display: block;
	width: 18px; height: 2px;
	background: currentColor;
	border-radius: 2px;
	position: relative;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ---------- 5. 按钮 ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 10px 22px;
	border-radius: 10px;
	border: 1px solid transparent;
	font-size: .95rem;
	font-weight: 600;
	font-family: inherit;
	line-height: 1.2;
	cursor: pointer;
	transition: all .18s ease;
	white-space: nowrap;
	text-decoration: none !important;
}
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 4px 14px rgba(37, 99, 235, .25); }
.btn-primary:hover { background: var(--brand-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 8px 20px rgba(37, 99, 235, .3); }
.btn-outline { background: #fff; color: var(--ink-2); border-color: var(--line); }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }
.btn-ghost { background: transparent; color: var(--brand); }
.btn-ghost:hover { background: var(--brand-soft); }
.btn-lg { padding: 13px 28px; font-size: 1rem; border-radius: 12px; }
.btn-sm { padding: 7px 14px; font-size: .86rem; border-radius: 8px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: not-allowed; transform: none !important; }

/* ---------- 6. 首屏 Hero ---------- */
.hero {
	position: relative;
	padding: 84px 0 96px;
	background:
		radial-gradient(900px 380px at 88% -8%, rgba(37, 99, 235, .10), transparent 62%),
		radial-gradient(700px 320px at 2% 8%, rgba(14, 165, 233, .08), transparent 60%),
		linear-gradient(180deg, #fbfcfe 0%, #ffffff 100%);
	border-bottom: 1px solid var(--line-soft);
	overflow: hidden;
}
.hero .container { display: flex; align-items: center; gap: 56px; }
.hero-copy { flex: 1 1 520px; max-width: 560px; }

.hero-badge {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 5px 12px;
	margin-bottom: 22px;
	border-radius: 100px;
	background: var(--brand-soft);
	border: 1px solid var(--brand-line);
	color: var(--brand-dark);
	font-size: .82rem;
	font-weight: 600;
}
.hero-badge i { font-size: .9rem; }

.hero h1 { margin-bottom: 18px; }
.hero h1 .accent { color: var(--brand); }
.hero-sub { font-size: 1.06rem; color: var(--muted); margin-bottom: 30px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }

.hero-points { display: flex; flex-wrap: wrap; gap: 20px 28px; padding: 0; margin: 0; list-style: none; }
.hero-points li { display: flex; align-items: center; gap: 7px; font-size: .9rem; color: var(--muted); }
.hero-points i { color: var(--ok); }

/* 纯 CSS/SVG 首屏视觉，零外链图片 */
.hero-visual { flex: 0 0 420px; max-width: 420px; }
.hero-visual svg { width: 100%; height: auto; display: block; filter: drop-shadow(0 20px 40px rgba(15, 23, 42, .10)); }

/* ---------- 7. 通用区块 ---------- */
.section { padding: 76px 0; }
.section-alt { background: var(--bg-2); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }

.section-head { text-align: center; max-width: 660px; margin: 0 auto 46px; }
.section-head h2 { margin-bottom: 12px; }
.section-head p { color: var(--muted); margin: 0; font-size: 1rem; }
.section-kicker {
	display: inline-block;
	font-size: .8rem;
	font-weight: 700;
	letter-spacing: .1em;
	text-transform: uppercase;
	color: var(--brand);
	margin-bottom: 10px;
}

/* ---------- 8. 卡片 ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
	background: #fff;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	box-shadow: var(--shadow-xs);
	overflow: hidden;
	transition: box-shadow .2s ease, transform .2s ease, border-color .2s ease;
}
.card-hover:hover { box-shadow: var(--shadow); transform: translateY(-2px); border-color: var(--brand-line); }
.card-header {
	padding: 14px 20px;
	font-weight: 600;
	color: var(--ink);
	background: var(--bg-2);
	border-bottom: 1px solid var(--line);
	font-size: .98rem;
}
.card-body { padding: 20px; }
.card-body > :last-child { margin-bottom: 0; }
.card-footer { padding: 13px 20px; background: var(--bg-2); border-top: 1px solid var(--line); font-size: .9rem; }

/* 特点卡片 */
.feature { padding: 26px 22px; }
.feature-icon {
	width: 50px; height: 50px;
	display: inline-flex; align-items: center; justify-content: center;
	border-radius: 13px;
	background: var(--brand-soft);
	color: var(--brand);
	font-size: 1.2rem;
	margin-bottom: 16px;
}
.feature h3 { font-size: 1.06rem; margin-bottom: 8px; }
.feature p { margin: 0; color: var(--muted); font-size: .92rem; }

/* 平台支持列表 */
.platform-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 34px; }
.platform-chip {
	display: inline-flex; align-items: center; gap: 9px;
	padding: 9px 16px;
	border: 1px solid var(--line);
	border-radius: 100px;
	background: #fff;
	font-size: .9rem;
	color: var(--ink-2);
	box-shadow: var(--shadow-xs);
}
.platform-chip i { font-size: 1.05rem; }

/* ---------- 9. 步骤 ---------- */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step { position: relative; padding-left: 58px; }
.step::before {
	counter-increment: step;
	content: counter(step);
	position: absolute; left: 0; top: 0;
	width: 38px; height: 38px;
	display: flex; align-items: center; justify-content: center;
	border-radius: 50%;
	background: var(--brand); color: #fff;
	font-weight: 700; font-size: .95rem;
}
.step h3 { font-size: 1.02rem; margin-bottom: 4px; }
.step p { margin: 0; color: var(--muted); font-size: .92rem; }

/* ---------- 10. 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.table {
	width: 100%;
	border-collapse: collapse;
	font-size: .92rem;
	background: #fff;
}
table.table th, table.table td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.table thead th { background: var(--bg-2); font-weight: 600; color: var(--ink); white-space: nowrap; }
table.table tbody tr:last-child td { border-bottom: 0; }
table.table tbody tr:hover { background: var(--brand-soft); }
.table-bordered th, .table-bordered td { border: 1px solid var(--line); }
.table-sm th, .table-sm td { padding: 7px 11px; }
.table-striped tbody tr:nth-child(odd) { background: #fbfcfe; }

/* ---------- 11. 文档页 ---------- */
.doc-layout { display: flex; gap: 30px; align-items: flex-start; }
.doc-side { flex: 0 0 236px; position: sticky; top: calc(var(--header-h) + 20px); }
.doc-side nav { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.doc-side nav a {
	display: block;
	padding: 11px 16px;
	color: var(--ink-3);
	font-size: .92rem;
	border-bottom: 1px solid var(--line-soft);
	transition: background .16s ease, color .16s ease, padding-left .16s ease;
}
.doc-side nav a:last-child { border-bottom: 0; }
.doc-side nav a:hover { background: var(--brand-soft); color: var(--brand); padding-left: 20px; }
.doc-side nav a.is-active { background: var(--brand-soft); color: var(--brand); box-shadow: inset 3px 0 0 var(--brand); font-weight: 600; }
.doc-main { flex: 1 1 auto; min-width: 0; }
.doc-main .card { margin-bottom: 20px; scroll-margin-top: calc(var(--header-h) + 16px); }
.doc-main h3 { font-size: 1rem; }

.prose { color: var(--ink-2); }
.prose b { color: var(--ink); }

/* ---------- 12. 友情链接 / 页脚 ---------- */
.links-section { font-size: .92rem; color: var(--muted); }
.links-section a { margin-right: 14px; }

.site-footer {
	background: #0f172a;
	color: #94a3b8;
	padding: 36px 0 28px;
	font-size: .89rem;
}
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: #fff; }
.site-footer .footer-top { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: center; padding-bottom: 20px; border-bottom: 1px solid #1e293b; }
.site-footer .footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; }
.site-footer .footer-brand img {
	width: 30px;
	height: 30px;
	border-radius: 8px;
	padding: 5px;
	object-fit: contain;
	background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}
.site-footer .footer-nav { display: flex; flex-wrap: wrap; gap: 20px; }
.site-footer .footer-bottom { padding-top: 18px; text-align: center; color: #64748b; }

/* ---------- 13. 工具类 ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-muted { color: var(--muted); }
.text-brand { color: var(--brand); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.d-none { display: none; }
.badge {
	display: inline-block; padding: 3px 10px; border-radius: 100px;
	font-size: .78rem; font-weight: 600;
	background: var(--brand-soft); color: var(--brand-dark);
}
.sr-only {
	position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
	overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 992px) {
	.hero { padding: 56px 0 68px; }
	.hero .container { flex-direction: column; gap: 40px; }
	.hero-visual { flex: none; width: 100%; max-width: 380px; margin: 0 auto; }
	.grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.doc-layout { flex-direction: column; }
	.doc-side { flex: none; width: 100%; position: static; }
	.doc-side nav { display: flex; flex-wrap: wrap; }
	.doc-side nav a { flex: 1 1 50%; border-bottom: 1px solid var(--line-soft); }
	.col-md-3, .col-md-4, .col-md-6, .col-md-8, .col-md-9 { flex: 0 0 50%; max-width: 50%; }
}

@media (max-width: 768px) {
	body { font-size: 14.5px; }
	h1 { font-size: 1.85rem; }
	h2 { font-size: 1.42rem; }
	.section { padding: 52px 0; }
	.nav-toggle { display: inline-flex; }
	.site-nav {
		position: absolute;
		top: var(--header-h);
		left: 0; right: 0;
		flex-direction: column;
		align-items: stretch;
		gap: 2px;
		padding: 10px 20px 18px;
		background: #fff;
		border-bottom: 1px solid var(--line);
		box-shadow: var(--shadow);
		display: none;
	}
	.site-nav.is-open { display: flex; }
	.site-nav a { padding: 11px 12px; }
	.site-nav a.nav-cta { margin-left: 0; text-align: center; }
	.site-header { position: sticky; }
	.grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
	.col-md-3, .col-md-4, .col-md-6, .col-md-8, .col-md-9 { flex: 0 0 100%; max-width: 100%; }
	.site-footer .footer-top { flex-direction: column; align-items: flex-start; }
	.doc-side nav a { flex: 1 1 100%; }
}

@media (max-width: 480px) {
	.container { padding: 0 16px; }
	.hero-actions .btn { flex: 1 1 100%; }
	.card-body { padding: 16px; }
}

/* ---------- 15. 打印 ---------- */
@media print {
	.site-header, .site-footer, .doc-side, .hero-actions { display: none !important; }
	body { font-size: 12pt; }
}

/* ==========================================================================
   15. 商务化扩展区块
   （信任数据带 / 应用场景 / FAQ / 底部转化 / 多列页脚）
   ========================================================================== */

/* ---------- 15.1 信任数据带 ---------- */
.trust-bar {
	border-top: 1px solid var(--line);
	border-bottom: 1px solid var(--line);
	background: linear-gradient(180deg, #fbfcfe 0%, #f5f8fd 100%);
	padding: 26px 0;
}
.trust-grid {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 18px;
}
.trust-item {
	text-align: center;
	position: relative;
	padding: 0 10px;
}
.trust-item + .trust-item::before {
	content: "";
	position: absolute;
	left: 0; top: 50%;
	transform: translateY(-50%);
	width: 1px; height: 34px;
	background: var(--line);
}
.trust-item strong {
	display: block;
	font-size: 1.65rem;
	font-weight: 700;
	letter-spacing: -.03em;
	color: var(--brand-dark);
	line-height: 1.2;
}
.trust-item span {
	display: block;
	margin-top: 4px;
	font-size: .85rem;
	color: var(--muted);
}

/* ---------- 15.2 平台列表条 ---------- */
.platform-strip .platform-chip i {
	display: inline-block;
	width: 8px; height: 8px;
	border-radius: 50%;
	background: var(--ok);
	box-shadow: 0 0 0 3px rgba(5, 150, 105, .14);
}

/* ---------- 15.3 应用场景 ---------- */
.usecase { position: relative; padding-top: 30px; }
.usecase-num {
	position: absolute;
	top: 18px; right: 20px;
	font-size: 1.6rem;
	font-weight: 800;
	letter-spacing: -.04em;
	color: var(--brand-line);
	line-height: 1;
	user-select: none;
}
.usecase h3 { font-size: 1.02rem; margin-bottom: .5em; }
.usecase p { margin: 0; font-size: .9rem; color: var(--muted); }

/* ---------- 15.4 常见问题 ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item {
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
	box-shadow: var(--shadow-xs);
	overflow: hidden;
	transition: border-color .18s ease, box-shadow .18s ease;
}
.faq-item[open] { border-color: var(--brand-line); box-shadow: var(--shadow-sm); }
.faq-item summary {
	cursor: pointer;
	list-style: none;
	padding: 16px 48px 16px 20px;
	font-weight: 600;
	color: var(--ink);
	font-size: .97rem;
	position: relative;
	transition: color .16s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--brand); }
.faq-item summary::after {
	content: "";
	position: absolute;
	right: 20px; top: 50%;
	width: 9px; height: 9px;
	margin-top: -6px;
	border-right: 2px solid var(--muted-2);
	border-bottom: 2px solid var(--muted-2);
	transform: rotate(45deg);
	transition: transform .2s ease, border-color .2s ease;
}
.faq-item[open] summary::after {
	transform: rotate(-135deg);
	margin-top: -1px;
	border-color: var(--brand);
}
.faq-item[open] summary { color: var(--brand-dark); }
.faq-body {
	padding: 0 20px 18px;
	font-size: .92rem;
	color: var(--ink-3);
	line-height: 1.8;
}
.faq-body code {
	background: var(--bg-3);
	padding: 1px 6px;
	border-radius: 5px;
	font-size: .86em;
}

/* ---------- 15.5 底部转化区 ---------- */
.cta-band {
	background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 55%, #3b82f6 100%);
	color: #fff;
	padding: 52px 0;
	position: relative;
	overflow: hidden;
}
.cta-band::after {
	content: "";
	position: absolute;
	right: -80px; top: -80px;
	width: 320px; height: 320px;
	border-radius: 50%;
	background: rgba(255, 255, 255, .07);
	pointer-events: none;
}
.cta-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 26px;
	flex-wrap: wrap;
	position: relative;
	z-index: 1;
}
.cta-copy h2 { color: #fff; font-size: 1.6rem; margin-bottom: .35em; }
.cta-copy p { margin: 0; color: rgba(255, 255, 255, .82); font-size: .95rem; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-light {
	background: #fff;
	color: var(--brand-dark);
	box-shadow: 0 6px 18px rgba(15, 23, 42, .18);
}
.btn-light:hover { background: #f1f5f9; color: var(--brand-deep); transform: translateY(-1px); }
.btn-ghost-light {
	background: rgba(255, 255, 255, .1);
	color: #fff;
	border-color: rgba(255, 255, 255, .45);
}
.btn-ghost-light:hover { background: rgba(255, 255, 255, .2); color: #fff; transform: translateY(-1px); }

/* ---------- 15.6 多列页脚 ---------- */
.site-footer { padding: 46px 0 26px; }
.footer-cols {
	display: grid;
	grid-template-columns: 1.6fr 1fr 1fr 1fr;
	gap: 34px;
	padding-bottom: 28px;
	border-bottom: 1px solid #1e293b;
}
.footer-col h4 {
	color: #fff;
	font-size: .92rem;
	font-weight: 600;
	margin: 0 0 14px;
	letter-spacing: .01em;
}
.footer-col a {
	display: block;
	padding: 5px 0;
	color: #94a3b8;
	font-size: .88rem;
	transition: color .16s ease, padding-left .16s ease;
}
.footer-col a:hover { color: #fff; padding-left: 3px; }
.footer-desc {
	margin: 14px 0 0;
	font-size: .86rem;
	line-height: 1.75;
	color: #7c8ba1;
	max-width: 330px;
}
.footer-bottom {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 12px;
	flex-wrap: wrap;
	padding-top: 20px;
	text-align: left;
}

/* ---------- 15.7 响应式 ---------- */
@media (max-width: 992px) {
	.footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }
}
@media (max-width: 767px) {
	.trust-bar { padding: 20px 0; }
	.trust-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 8px; }
	.trust-item:nth-child(odd)::before { display: none; }
	.trust-item:nth-child(3)::before,
	.trust-item:nth-child(4)::before { display: block; }
	.trust-item strong { font-size: 1.4rem; }
	.trust-item span { font-size: .79rem; }
	.cta-band { padding: 38px 0; }
	.cta-copy h2 { font-size: 1.3rem; }
	.cta-actions { width: 100%; }
	.cta-actions .btn { flex: 1; }
	.faq-item summary { padding: 14px 42px 14px 16px; font-size: .93rem; }
	.faq-body { padding: 0 16px 15px; }
	.site-footer { padding: 34px 0 22px; }
	.footer-cols { grid-template-columns: 1fr; gap: 22px; padding-bottom: 22px; }
	.footer-col a { padding: 4px 0; }
	.footer-bottom { flex-direction: column; align-items: flex-start; text-align: left; font-size: .82rem; }
}
@media (max-width: 400px) {
	.trust-item strong { font-size: 1.24rem; }
	.trust-item span { font-size: .74rem; }
}

/* ==========================================================================
   快速开始（多语言代码示例）
   ========================================================================== */
.qs {
	display: grid;
	grid-template-columns: 296px minmax(0, 1fr);
	gap: 34px;
	align-items: start;
}

/* 左侧步骤 */
.qs-steps {
	list-style: none;
	margin: 0 0 22px;
	padding: 0;
	counter-reset: qs;
	display: grid;
	gap: 4px;
}
.qs-steps li {
	position: relative;
	padding: 14px 0 14px 44px;
	border-bottom: 1px dashed var(--line);
	counter-increment: qs;
}
.qs-steps li:last-child { border-bottom: 0; }
.qs-steps li::before {
	content: counter(qs);
	position: absolute;
	left: 0; top: 15px;
	width: 26px; height: 26px;
	display: grid;
	place-items: center;
	border-radius: 8px;
	background: var(--brand-soft);
	border: 1px solid var(--brand-line);
	color: var(--brand);
	font-size: .78rem;
	font-weight: 700;
}
.qs-steps b { display: block; color: var(--ink); font-size: .95rem; font-weight: 600; margin-bottom: 2px; }
.qs-steps span { display: block; font-size: .86rem; color: var(--muted); line-height: 1.6; }
.qs-doc {
	display: inline-flex;
	align-items: center;
	gap: 7px;
	font-size: .92rem;
	font-weight: 600;
	color: var(--brand);
	text-decoration: none;
}
.qs-doc svg { transition: transform .18s ease; }
.qs-doc:hover svg { transform: translateX(3px); }

/* 右侧代码面板 */
.qs-code {
	border-radius: var(--radius-lg);
	overflow: hidden;
	background: #0d1526;
	border: 1px solid #1e293b;
	box-shadow: 0 20px 46px rgba(15, 23, 42, .16);
	min-width: 0;
}
.qs-bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 10px 14px;
	padding: 10px 14px;
	background: #101a2e;
	border-bottom: 1px solid #1e293b;
}
.qs-tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.qs-tab {
	appearance: none;
	border: 0;
	background: transparent;
	color: #93a4c0;
	font-family: inherit;
	font-size: .82rem;
	font-weight: 600;
	padding: 6px 13px;
	border-radius: 7px;
	cursor: pointer;
	transition: color .16s ease, background .16s ease;
}
.qs-tab:hover { color: #e2e8f0; background: rgba(148, 163, 184, .12); }
.qs-tab.is-active { color: #fff; background: rgba(59, 130, 246, .28); box-shadow: inset 0 0 0 1px rgba(96, 165, 250, .42); }
.qs-copy {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	appearance: none;
	border: 1px solid #253449;
	background: #16223a;
	color: #a9b8d0;
	font-family: inherit;
	font-size: .76rem;
	padding: 5px 11px;
	border-radius: 7px;
	cursor: pointer;
	white-space: nowrap;
	transition: color .16s ease, border-color .16s ease, background .16s ease;
}
.qs-copy:hover { color: #fff; border-color: #3b82f6; background: #1b2b48; }
.qs-copy.is-done { color: #6ee7b7; border-color: #10b981; }
.qs-pre {
	margin: 0;
	padding: 20px 22px 24px;
	overflow-x: auto;
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
	font-size: .815rem;
	line-height: 1.78;
	color: #cbd5e1;
	tab-size: 4;
}
.qs-pre code { display: block; white-space: pre; }
.qs-pre code[hidden] { display: none !important; }
/* 轻量语法着色 */
.qs-pre .c { color: #64748b; font-style: italic; }
.qs-pre .k { color: #c084fc; }
.qs-pre .s { color: #7dd3fc; }
.qs-pre .f { color: #fbbf24; }
.qs-pre .v { color: #f0abfc; }

@media (max-width: 992px) {
	.qs { grid-template-columns: minmax(0, 1fr); gap: 26px; }
	.qs-steps li:last-child { border-bottom: 1px dashed var(--line); }
}
@media (max-width: 560px) {
	.qs-pre { padding: 16px 16px 18px; font-size: .76rem; }
	.qs-bar { padding: 9px 12px; }
	.qs-tab { padding: 5px 10px; font-size: .78rem; }
	.qs-copy { font-size: .72rem; padding: 4px 9px; }
}

/* ==========================================================================
   安全与合规信任带
   ========================================================================== */
.safe-band { padding: 60px 0; background: var(--bg-2); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.safe-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 34px; flex-wrap: wrap; }
.safe-head h2 { margin: 0 0 8px; font-size: 1.5rem; }
.safe-head p { margin: 0; color: var(--muted); font-size: .96rem; max-width: 620px; }
.safe-tag {
	display: inline-flex;
	align-items: center;
	gap: 7px;
	flex: 0 0 auto;
	padding: 7px 14px;
	border-radius: 100px;
	background: #ecfdf5;
	border: 1px solid #a7f3d0;
	color: #047857;
	font-size: .82rem;
	font-weight: 600;
}
.safe-tag svg { flex: 0 0 auto; }
.safe-grid {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	border: 1px solid var(--line);
	border-radius: var(--radius-lg);
	background: #fff;
	overflow: hidden;
}
.safe-item {
	padding: 26px 24px;
	border-right: 1px solid var(--line-soft);
}
.safe-item:last-child { border-right: 0; }
.safe-ico {
	width: 40px; height: 40px;
	display: grid;
	place-items: center;
	margin-bottom: 14px;
	border-radius: 11px;
	background: var(--brand-soft);
	color: var(--brand);
}
.safe-item h3 { font-size: .98rem; margin-bottom: .4em; }
.safe-item p { margin: 0; font-size: .87rem; color: var(--muted); line-height: 1.68; }

@media (max-width: 992px) {
	.safe-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.safe-item:nth-child(2n) { border-right: 0; }
	.safe-item:nth-child(-n+2) { border-bottom: 1px solid var(--line-soft); }
}
@media (max-width: 560px) {
	.safe-grid { grid-template-columns: minmax(0, 1fr); }
	.safe-item { border-right: 0; border-bottom: 1px solid var(--line-soft); }
	.safe-item:last-child { border-bottom: 0; }
	.safe-item:nth-child(-n+2) { border-bottom: 1px solid var(--line-soft); }
	.safe-head h2 { font-size: 1.28rem; }
}