/* ==========================================================================
   官网首页（落地页）样式
   
   目标：一套 CSS 同时适配手机（375px 起）、平板（768px）、PC（1280px+）。
   做法：
     1. 字号/间距用 clamp() 流式伸缩，减少断点数量；
     2. 栅格用 grid auto-fit + minmax，容器宽度足够就自动多列；
     3. 只在真正需要改结构的地方用媒体查询（导航、hero 双栏、按钮组）。
   
   本文件是纯 CSS，不依赖任何 CDN 或框架。
   ========================================================================== */

:root {
	--brand: #1a73e8;
	--brand-light: #4a9eff;
	--brand-deep: #1257b8;
	--brand-soft: #e8f1fe;

	--ink: #142036;
	--ink-2: #445772;
	--ink-3: #7c8ca3;

	--bg: #ffffff;
	--bg-2: #f5f8fc;
	--bg-3: #eef3fa;

	--line: #e2eaf3;
	--line-2: #cfdced;

	--ok: #14a06e;
	--ok-soft: #e6f6f0;
	--warn: #e08a00;
	--warn-soft: #fef5e6;

	--radius: 16px;
	--radius-sm: 10px;
	--radius-lg: 24px;

	--shadow-sm: 0 2px 8px rgba(20, 32, 54, 0.05);
	--shadow: 0 8px 24px rgba(20, 32, 54, 0.07);
	--shadow-lg: 0 20px 48px rgba(20, 32, 54, 0.1);

	--nav-h: 64px;
}

* {
	box-sizing: border-box;
}

html {
	-webkit-text-size-adjust: 100%;
	scroll-behavior: smooth;
	/* 锚点跳转时避开吸顶导航 */
	scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--ink);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
		"Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
	font-size: 16px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
}

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

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

.wrap {
	width: 100%;
	max-width: 1200px;
	margin: 0 auto;
	padding: 0 clamp(16px, 4vw, 32px);
}

/* ============================ 顶部导航 ============================ */

.nav {
	position: sticky;
	top: 0;
	z-index: 50;
	height: var(--nav-h);
	background: rgba(255, 255, 255, 0.88);
	backdrop-filter: saturate(180%) blur(14px);
	-webkit-backdrop-filter: saturate(180%) blur(14px);
	border-bottom: 1px solid var(--line);
}

.nav-inner {
	display: flex;
	align-items: center;
	gap: 12px;
	height: 100%;
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	flex: none;
	font-weight: 700;
	font-size: 17px;
	letter-spacing: 0.2px;
}

.brand-mark {
	width: 34px;
	height: 34px;
	flex: none;
	display: grid;
	place-items: center;
	border-radius: 10px;
	background: linear-gradient(135deg, var(--brand), var(--brand-light));
	box-shadow: 0 4px 12px rgba(26, 115, 232, 0.32);
}

.brand-mark svg {
	width: 19px;
	height: 19px;
}

.brand-name small {
	display: block;
	font-size: 10px;
	font-weight: 500;
	letter-spacing: 1.4px;
	color: var(--ink-3);
	line-height: 1;
	margin-top: 2px;
}

/* 桌面导航链接 */
.nav-links {
	display: flex;
	align-items: center;
	gap: 4px;
	margin-left: 18px;
}

.nav-links a {
	padding: 8px 12px;
	border-radius: 8px;
	font-size: 14.5px;
	color: var(--ink-2);
	transition: background 0.16s ease, color 0.16s ease;
	white-space: nowrap;
}

.nav-links a:hover {
	background: var(--bg-3);
	color: var(--brand);
}

.nav-spacer {
	flex: 1;
}

.nav-actions {
	display: flex;
	align-items: center;
	gap: 8px;
	flex: none;
}

/* 按钮 */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 7px;
	height: 40px;
	padding: 0 18px;
	border: 1px solid transparent;
	border-radius: 9px;
	font-size: 14.5px;
	font-weight: 500;
	line-height: 1;
	cursor: pointer;
	white-space: nowrap;
	transition: background 0.16s ease, border-color 0.16s ease,
		box-shadow 0.16s ease, transform 0.12s ease;
}

.btn:active {
	transform: translateY(1px);
}

.btn-primary {
	background: var(--brand);
	color: #fff;
	box-shadow: 0 6px 16px rgba(26, 115, 232, 0.26);
}

.btn-primary:hover {
	background: var(--brand-deep);
	box-shadow: 0 8px 22px rgba(26, 115, 232, 0.34);
}

.btn-ghost {
	background: #fff;
	color: var(--ink-2);
	border-color: var(--line-2);
}

.btn-ghost:hover {
	color: var(--brand);
	border-color: var(--brand);
	background: var(--brand-soft);
}

.btn-lg {
	height: 48px;
	padding: 0 26px;
	font-size: 15.5px;
	border-radius: 11px;
}

.btn-block {
	width: 100%;
}

.btn svg {
	width: 17px;
	height: 17px;
	flex: none;
}

/* 汉堡按钮（仅移动端） */
.nav-toggle {
	display: none;
	width: 40px;
	height: 40px;
	align-items: center;
	justify-content: center;
	border: 1px solid var(--line-2);
	border-radius: 9px;
	background: #fff;
	cursor: pointer;
	padding: 0;
}

.nav-toggle span {
	display: block;
	width: 17px;
	height: 2px;
	background: var(--ink-2);
	border-radius: 2px;
	position: relative;
	transition: background 0.16s ease;
}

.nav-toggle span::before,
.nav-toggle span::after {
	content: "";
	position: absolute;
	left: 0;
	width: 17px;
	height: 2px;
	background: var(--ink-2);
	border-radius: 2px;
	transition: transform 0.2s ease, top 0.2s ease;
}

.nav-toggle span::before {
	top: -6px;
}

.nav-toggle span::after {
	top: 6px;
}

.nav-toggle.is-open span {
	background: transparent;
}

.nav-toggle.is-open span::before {
	top: 0;
	transform: rotate(45deg);
}

.nav-toggle.is-open span::after {
	top: 0;
	transform: rotate(-45deg);
}

/* 移动端下拉菜单 */
.nav-drawer {
	display: none;
	position: fixed;
	left: 0;
	right: 0;
	top: var(--nav-h);
	z-index: 60;
	max-height: calc(100vh - var(--nav-h));
	overflow-y: auto;
	-webkit-overflow-scrolling: touch;
	padding: 12px clamp(16px, 4vw, 32px) 20px;
	/* 必须是完全不透明：.nav 用了 backdrop-filter 会建立新的层叠上下文，
	   半透明背景会让下方 hero 文字透出来（实测截图可见） */
	background: var(--bg);
	border-bottom: 1px solid var(--line);
	box-shadow: 0 18px 32px rgba(20, 32, 54, 0.12);
}

/* 抽屉打开时的遮罩层，点击可关闭，并阻止滚动穿透 */
.drawer-mask {
	display: none;
	position: fixed;
	inset: 0;
	z-index: 55;
	background: rgba(20, 32, 54, 0.28);
}

.drawer-mask.is-open {
	display: block;
}

/* 抽屉打开时锁定 body 滚动，避免背景跟着滚 */
body.drawer-open {
	overflow: hidden;
}

.nav-drawer.is-open {
	display: block;
}

.nav-drawer a {
	display: block;
	padding: 13px 12px;
	border-radius: 9px;
	font-size: 15.5px;
	color: var(--ink);
}

.nav-drawer a:hover {
	background: var(--bg-3);
}

.nav-drawer .drawer-sep {
	height: 1px;
	background: var(--line);
	margin: 8px 0;
}

.nav-drawer .drawer-btns {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 10px;
	margin-top: 6px;
}

/* ============================ Hero ============================ */

.hero {
	position: relative;
	overflow: hidden;
	padding: clamp(44px, 7vw, 84px) 0 clamp(40px, 6vw, 72px);
	background:
		radial-gradient(1000px 460px at 12% -8%, #e8f1fe 0%, rgba(232, 241, 254, 0) 62%),
		radial-gradient(760px 400px at 96% 4%, #eef7ff 0%, rgba(238, 247, 255, 0) 58%),
		linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

/* 淡网格纹理，纯 CSS，不用图片 */
.hero::before {
	content: "";
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(rgba(26, 115, 232, 0.05) 1px, transparent 1px),
		linear-gradient(90deg, rgba(26, 115, 232, 0.05) 1px, transparent 1px);
	background-size: 44px 44px;
	mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
	-webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
	pointer-events: none;
}

.hero-inner {
	position: relative;
	display: grid;
	grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
	gap: clamp(28px, 5vw, 64px);
	align-items: center;
}

.eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	height: 30px;
	padding: 0 13px;
	border: 1px solid rgba(26, 115, 232, 0.22);
	border-radius: 999px;
	background: rgba(255, 255, 255, 0.8);
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 1.1px;
	color: var(--brand);
	text-transform: uppercase;
}

.eyebrow .dot {
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--ok);
	box-shadow: 0 0 0 3px rgba(20, 160, 110, 0.16);
}

.hero h1 {
	margin: 18px 0 0;
	font-size: clamp(30px, 5.2vw, 50px);
	line-height: 1.14;
	letter-spacing: -0.6px;
	font-weight: 800;
}

.hero h1 em {
	font-style: normal;
	background: linear-gradient(120deg, var(--brand) 0%, var(--brand-light) 100%);
	-webkit-background-clip: text;
	background-clip: text;
	-webkit-text-fill-color: transparent;
}

.hero-sub {
	margin: 18px 0 0;
	max-width: 34em;
	font-size: clamp(15px, 1.5vw, 17px);
	color: var(--ink-2);
}

.hero-cta {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 28px;
}

.hero-note {
	margin: 16px 0 0;
	font-size: 13px;
	color: var(--ink-3);
}

/* Hero 右侧：控制台预览卡 */
.preview {
	position: relative;
	border: 1px solid var(--line);
	border-radius: var(--radius-lg);
	background: #fff;
	box-shadow: var(--shadow-lg);
	overflow: hidden;
}

.preview-bar {
	display: flex;
	align-items: center;
	gap: 7px;
	padding: 12px 16px;
	border-bottom: 1px solid var(--line);
	background: var(--bg-2);
}

.preview-bar i {
	width: 10px;
	height: 10px;
	border-radius: 50%;
	background: #ff5f57;
}

.preview-bar i:nth-child(2) {
	background: #febc2e;
}

.preview-bar i:nth-child(3) {
	background: #28c840;
}

.preview-bar span {
	margin-left: 8px;
	font-size: 12px;
	color: var(--ink-3);
}

.preview-body {
	padding: 18px;
	display: grid;
	gap: 12px;
}

.preview-card {
	padding: 14px 16px;
	border: 1px solid var(--line);
	border-radius: var(--radius-sm);
	background: #fff;
}

.preview-card-top {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 10px;
}

.preview-name {
	font-size: 14px;
	font-weight: 600;
}

.preview-pill {
	display: inline-flex;
	align-items: center;
	gap: 5px;
	padding: 2px 9px;
	border-radius: 999px;
	font-size: 11px;
	font-weight: 600;
}

.preview-pill.on {
	background: var(--ok-soft);
	color: #0f7d56;
}

.preview-pill.off {
	background: var(--bg-3);
	color: var(--ink-3);
}

.preview-pill i {
	width: 5px;
	height: 5px;
	border-radius: 50%;
	background: currentColor;
}

.preview-meta {
	display: flex;
	gap: 16px;
	margin-top: 9px;
	font-size: 11.5px;
	color: var(--ink-3);
}

.preview-meta b {
	display: block;
	font-size: 13.5px;
	font-weight: 600;
	color: var(--ink);
	font-variant-numeric: tabular-nums;
}

.preview-action {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 8px;
	margin-top: 14px;
}

.preview-action span {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 5px;
	height: 34px;
	border-radius: 8px;
	background: var(--brand-soft);
	color: var(--brand);
	font-size: 12.5px;
	font-weight: 500;
}

.preview-action span:first-child {
	background: var(--brand);
	color: #fff;
}

.preview-action svg {
	width: 13px;
	height: 13px;
}

/* ============================ 数据条 ============================ */

.stats {
	border-top: 1px solid var(--line);
	border-bottom: 1px solid var(--line);
	background: var(--bg-2);
}

.stats-inner {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 0;
	padding: 22px 0;
}

.stat {
	padding: 0 12px;
	text-align: center;
	border-right: 1px solid var(--line-2);
}

.stat:last-child {
	border-right: 0;
}

.stat b {
	display: block;
	font-size: clamp(19px, 2.4vw, 24px);
	font-weight: 700;
	color: var(--brand);
	line-height: 1.2;
	font-variant-numeric: tabular-nums;
}

.stat span {
	display: block;
	margin-top: 3px;
	font-size: 12.5px;
	color: var(--ink-3);
}

/* ============================ 通用区块 ============================ */

.section {
	padding: clamp(48px, 7vw, 88px) 0;
}

.section.alt {
	background: var(--bg-2);
}

.section-head {
	max-width: 720px;
	margin: 0 auto clamp(28px, 4vw, 46px);
	text-align: center;
}

.section-eyebrow {
	font-size: 11.5px;
	font-weight: 700;
	letter-spacing: 1.6px;
	text-transform: uppercase;
	color: var(--brand);
}

.section-head h2 {
	margin: 10px 0 0;
	font-size: clamp(23px, 3.6vw, 34px);
	line-height: 1.25;
	letter-spacing: -0.4px;
	font-weight: 800;
}

.section-head p {
	margin: 12px 0 0;
	font-size: clamp(14px, 1.4vw, 15.5px);
	color: var(--ink-2);
}

/* ============================ 功能特性 ============================ */

.features {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 268px), 1fr));
	gap: 16px;
}

.feature {
	padding: 24px;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
	transition: border-color 0.18s ease, box-shadow 0.18s ease,
		transform 0.18s ease;
}

.feature:hover {
	border-color: var(--line-2);
	box-shadow: var(--shadow);
	transform: translateY(-2px);
}

.feature-icon {
	width: 42px;
	height: 42px;
	display: grid;
	place-items: center;
	border-radius: 11px;
	background: var(--brand-soft);
	color: var(--brand);
	margin-bottom: 14px;
}

.feature-icon svg {
	width: 21px;
	height: 21px;
}

.feature h3 {
	margin: 0;
	font-size: 16.5px;
	font-weight: 700;
	letter-spacing: -0.1px;
}

.feature p {
	margin: 8px 0 0;
	font-size: 14px;
	color: var(--ink-2);
	line-height: 1.7;
}

/* ============================ 下载 ============================ */

.dl-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
	gap: 16px;
}

.dl-card {
	display: flex;
	flex-direction: column;
	padding: 22px;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
	transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.dl-card:hover {
	border-color: var(--line-2);
	box-shadow: var(--shadow);
}

.dl-head {
	display: flex;
	align-items: center;
	gap: 12px;
}

.dl-icon {
	width: 40px;
	height: 40px;
	flex: none;
	display: grid;
	place-items: center;
	border-radius: 10px;
	background: var(--bg-3);
	color: var(--ink-2);
}

.dl-icon svg {
	width: 20px;
	height: 20px;
}

.dl-title {
	font-size: 15.5px;
	font-weight: 700;
	line-height: 1.3;
}

.dl-desc {
	font-size: 12.5px;
	color: var(--ink-3);
}

.dl-items {
	display: grid;
	gap: 8px;
	margin-top: 16px;
}

.dl-item {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 10px;
	padding: 9px 13px;
	border: 1px solid var(--line);
	border-radius: var(--radius-sm);
	font-size: 13.5px;
	color: var(--ink-2);
	background: #fff;
	transition: border-color 0.16s ease, background 0.16s ease, color 0.16s ease;
}

.dl-item:hover {
	border-color: var(--brand);
	background: var(--brand-soft);
	color: var(--brand-deep);
}

.dl-item.is-primary {
	border-color: rgba(26, 115, 232, 0.34);
	background: var(--brand-soft);
	color: var(--brand-deep);
	font-weight: 600;
}

.dl-item.is-primary:hover {
	background: #dbe9fd;
}

.dl-item-left {
	display: flex;
	align-items: center;
	gap: 8px;
	min-width: 0;
}

.dl-item-left svg {
	width: 15px;
	height: 15px;
	flex: none;
	opacity: 0.7;
}

.dl-hint {
	font-size: 11.5px;
	color: var(--ink-3);
	font-variant-numeric: tabular-nums;
}

.dl-item.is-primary .dl-hint {
	color: var(--brand);
}

.dl-item.is-disabled {
	opacity: 0.45;
	pointer-events: none;
}

.dl-note {
	display: flex;
	align-items: flex-start;
	gap: 10px;
	margin-top: 22px;
	padding: 15px 18px;
	border: 1px solid rgba(224, 138, 0, 0.28);
	border-radius: var(--radius-sm);
	background: var(--warn-soft);
	font-size: 13px;
	color: #7a5a12;
	line-height: 1.7;
}

.dl-note svg {
	width: 16px;
	height: 16px;
	flex: none;
	margin-top: 3px;
	color: var(--warn);
}

/* APP 下载卡（横向，突出） */
.app-card {
	display: grid;
	grid-template-columns: minmax(0, 1fr) auto;
	align-items: center;
	gap: clamp(20px, 4vw, 44px);
	padding: clamp(22px, 4vw, 34px);
	border: 1px solid var(--line);
	border-radius: var(--radius-lg);
	background:
		radial-gradient(560px 240px at 92% -10%, #e8f1fe 0%, rgba(232, 241, 254, 0) 66%),
		#fff;
	box-shadow: var(--shadow-sm);
}

.app-card h3 {
	margin: 0;
	font-size: clamp(19px, 2.6vw, 24px);
	font-weight: 800;
	letter-spacing: -0.3px;
}

.app-card p {
	margin: 10px 0 0;
	font-size: 14px;
	color: var(--ink-2);
	max-width: 40em;
}

.app-tags {
	display: flex;
	flex-wrap: wrap;
	gap: 7px;
	margin-top: 14px;
}

.app-tags span {
	padding: 3px 10px;
	border-radius: 999px;
	background: var(--bg-3);
	font-size: 11.5px;
	color: var(--ink-2);
}

.app-side {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 10px;
	flex: none;
}

.app-qr {
	width: 120px;
	height: 120px;
	display: grid;
	place-items: center;
	border-radius: var(--radius-sm);
	border: 1px dashed var(--line-2);
	background: var(--bg-2);
	font-size: 11.5px;
	color: var(--ink-3);
	text-align: center;
	padding: 10px;
}

.app-size {
	font-size: 11.5px;
	color: var(--ink-3);
	font-variant-numeric: tabular-nums;
}

/* ============================ 安全 ============================ */

.secure {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
	gap: 16px;
}

.secure-item {
	display: flex;
	gap: 14px;
	padding: 22px;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
}

.secure-icon {
	width: 38px;
	height: 38px;
	flex: none;
	display: grid;
	place-items: center;
	border-radius: 10px;
	background: var(--ok-soft);
	color: var(--ok);
}

.secure-icon svg {
	width: 19px;
	height: 19px;
}

.secure-item h3 {
	margin: 0;
	font-size: 15.5px;
	font-weight: 700;
}

.secure-item p {
	margin: 6px 0 0;
	font-size: 13.5px;
	color: var(--ink-2);
	line-height: 1.7;
}

/* ============================ 步骤 ============================ */

.steps {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
	gap: 16px;
	counter-reset: step;
}

.step {
	position: relative;
	padding: 24px 22px 22px;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
}

.step::before {
	counter-increment: step;
	content: counter(step);
	position: absolute;
	top: -14px;
	left: 22px;
	width: 30px;
	height: 30px;
	display: grid;
	place-items: center;
	border-radius: 9px;
	background: var(--brand);
	color: #fff;
	font-size: 14px;
	font-weight: 700;
	box-shadow: 0 6px 14px rgba(26, 115, 232, 0.28);
}

.step h3 {
	margin: 12px 0 0;
	font-size: 15.5px;
	font-weight: 700;
}

.step p {
	margin: 7px 0 0;
	font-size: 13.5px;
	color: var(--ink-2);
	line-height: 1.7;
}

.step a {
	color: var(--brand);
	font-weight: 500;
}

.step a:hover {
	text-decoration: underline;
}

/* ============================ CTA 收尾 ============================ */

.final-cta {
	position: relative;
	overflow: hidden;
	padding: clamp(38px, 6vw, 64px) clamp(22px, 4vw, 52px);
	border-radius: var(--radius-lg);
	background: linear-gradient(125deg, #1257b8 0%, #1a73e8 52%, #4a9eff 100%);
	color: #fff;
	text-align: center;
	box-shadow: 0 24px 54px rgba(18, 87, 184, 0.28);
}

.final-cta::before {
	content: "";
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(rgba(255, 255, 255, 0.09) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.09) 1px, transparent 1px);
	background-size: 40px 40px;
	mask-image: radial-gradient(circle at 50% 120%, #000 0%, transparent 70%);
	-webkit-mask-image: radial-gradient(circle at 50% 120%, #000 0%, transparent 70%);
	pointer-events: none;
}

.final-cta > * {
	position: relative;
}

.final-cta h2 {
	margin: 0;
	font-size: clamp(22px, 3.4vw, 32px);
	font-weight: 800;
	letter-spacing: -0.4px;
}

.final-cta p {
	margin: 12px auto 0;
	max-width: 34em;
	font-size: clamp(14px, 1.5vw, 16px);
	color: rgba(255, 255, 255, 0.86);
}

.final-cta .hero-cta {
	justify-content: center;
	margin-top: 26px;
}

.final-cta .btn-primary {
	background: #fff;
	color: var(--brand-deep);
	box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
}

.final-cta .btn-primary:hover {
	background: #f2f7ff;
}

.final-cta .btn-ghost {
	background: rgba(255, 255, 255, 0.12);
	border-color: rgba(255, 255, 255, 0.4);
	color: #fff;
}

.final-cta .btn-ghost:hover {
	background: rgba(255, 255, 255, 0.22);
	border-color: #fff;
	color: #fff;
}

/* ============================ 页脚 ============================ */

.footer {
	margin-top: clamp(44px, 6vw, 76px);
	padding: 34px 0 28px;
	border-top: 1px solid var(--line);
	background: var(--bg-2);
}

.footer-inner {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 18px;
}

.footer-brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-size: 14px;
	color: var(--ink-2);
}

.footer-links {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 20px;
	font-size: 13.5px;
	color: var(--ink-2);
}

.footer-links a:hover {
	color: var(--brand);
}

.footer-copy {
	margin-top: 18px;
	font-size: 12px;
	color: var(--ink-3);
	text-align: center;
}

/* ==========================================================================
   响应式
   ========================================================================== */

/* 平板及以下：hero 改单栏，预览卡居中收窄 */
@media (max-width: 900px) {
	.hero-inner {
		grid-template-columns: minmax(0, 1fr);
	}

	.preview {
		max-width: 520px;
		margin: 0 auto;
		width: 100%;
	}

	.app-card {
		grid-template-columns: minmax(0, 1fr);
	}

	.app-side {
		flex-direction: row;
		justify-content: flex-start;
		gap: 16px;
	}
}

/* 手机：收起桌面导航，改汉堡菜单；统计条改 2x2 */
@media (max-width: 760px) {
	.nav-links,
	.nav-actions {
		display: none;
	}

	.nav-toggle {
		display: flex;
	}

	.stats-inner {
		grid-template-columns: repeat(2, 1fr);
		gap: 18px 0;
	}

	.stat:nth-child(2) {
		border-right: 0;
	}

	.stat:nth-child(3) {
		border-right: 1px solid var(--line-2);
	}

	.hero-cta .btn {
		flex: 1 1 auto;
	}

	.final-cta .hero-cta .btn {
		flex: 1 1 100%;
	}
}

/* 小屏手机：进一步压缩留白 */
@media (max-width: 420px) {
	:root {
		--nav-h: 58px;
	}

	.brand-name small {
		display: none;
	}

	.hero-cta {
		flex-direction: column;
	}

	.hero-cta .btn {
		width: 100%;
	}

	.app-side {
		flex-direction: column;
		align-items: flex-start;
	}

	.app-qr {
		width: 100%;
		height: 88px;
	}
}

/* 大屏：略微加大留白 */
@media (min-width: 1440px) {
	.wrap {
		max-width: 1280px;
	}
}

/* 尊重用户的「减少动效」偏好 */
@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	* {
		transition: none !important;
		animation: none !important;
	}
}

/* 打印时隐藏导航与交互元素 */
@media print {
	.nav,
	.nav-drawer,
	.final-cta .hero-cta,
	.footer-links {
		display: none !important;
	}
}