/********** 变量定义 **********/
:root {
	--bg-color: #fcfcfc;
	--bg-secondary: #f4f5f7;
	--bg-card: #ffffff;

	--text-primary: #111827;
	--text-secondary: #4b5563;
	--text-muted: #9ca3af;

	--primary-color: #8b5cf6;
	--primary-hover: #7c3aed;
	--primary-light: #f3e8ff;

	--border-color: #e5e7eb;
	--border-light: #f3f4f6;

	--a-color: #007dbb;

	/* Fonts */
	--font-family:system-ui, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;

	/* Shadows - Soft and Premium */
	--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
	--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
	--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);

	/* Radius */
	--radius-md: 0.5rem;
	--radius-lg: 1rem;
	--radius-xl: 1.5rem;

	/* Transitions (Strictly no translateY) */
	--transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/********** 全局设置 **********/
* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
html {
	font-family: var(--font-family);
	background-color: var(--bg-color);
	color: var(--text-primary);
	line-height: 1.6;
}
body {
	overflow-x: hidden;
	-webkit-font-smoothing: antialiased;
}
a {
	text-decoration: none;
	color: inherit;
	transition: var(--transition);
}
ul {
	list-style: none;
}
code{
	display: inline-block;
	margin: auto 4px;
	padding: 0px 4px;
	color: var(--text-secondary);
	font-family: var(--font-family);
	border: 1px solid var(--border-color);
	background: var(--bg-color);
	border-radius: 4px;
}

/********** Icon Font **********/
@font-face {
	font-family: "iconfont";
	src: url('../font/iconfont.eot?v=1.0');
	src: url('../font/iconfont.eot?v=1.0#iefix') format('embedded-opentype'),
		 url('../font/iconfont.woff2?v=1.0') format('woff2'),
		 url('../font/iconfont.woff?v=1.0') format('woff'),
		 url('../font/iconfont.ttf?v=1.0') format('truetype'),
		 url('../font/iconfont.svg?v=1.0#xxx') format('svg');
}
.iconfont{
	font-family: "iconfont" !important;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}
.iconfont-download:before{
	content: "\e6a9";
}
.iconfont-document:before{
	content: "\e8a0";
}
.iconfont-code:before{
	content: "\e7ac";
}
.iconfont-compiler:before{
	content: "\e603";
}
.iconfont-debug:before{
	content: "\e61b";
}
.iconfont-project:before{
	content: "\e64b";
}
.iconfont-palette:before{
	content: "\e611";
}
.iconfont-free:before{
	content: "\e620";
}
.iconfont-student:before{
	content: "\e64f";
}
.iconfont-school:before{
	content: "\e60f";
}
.iconfont-dev:before{
	content: "\eb59";
}
.iconfont-algorithm:before{
	content: "\ea09";
}
.iconfont-arrow-up:before{
	content: "\e645";
}
.iconfont-lightning:before{
	content: "\e6c6";
}
.iconfont-easy:before{
	content: "\e628";
}

/********** 布局 **********/
.mx {
	max-width: 1200px;
	margin: 0 auto;
	padding: 0 2rem;
}

.sec {
	padding: 6rem 0;
}

.sec--alt {
	background-color: var(--bg-secondary);
}

.text-center {
	text-align: center;
}

/********** 标题 **********/
.h1 {
	font-size: clamp(2.5rem, 5vw, 4rem);
	font-weight: 800;
	line-height: 1.1;
	letter-spacing: -0.02em;
	margin-bottom: 1.5rem;
}
.h2 {
	font-size: clamp(2rem, 4vw, 3rem);
	font-weight: 700;
	line-height: 1.2;
	letter-spacing: -0.01em;
	margin-bottom: 1rem;
}
.h3 {
	font-size: 1.5rem;
	font-weight: 600;
	margin-bottom: 0.75rem;
}

.p-lead {
	font-size: 1.25rem;
	color: var(--text-secondary);
	max-width: 800px;
	margin: 0 auto 2rem;
}

.text-gradient {
	background: linear-gradient(135deg, #111827 0%, var(--primary-color) 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.badge {
	display: inline-block;
	padding: 0.25rem 0.75rem;
	font-size: 0.875rem;
	font-weight: 600;
	border-radius: 9999px;
	background-color: var(--primary-light);
	color: var(--primary-color);
	margin-bottom: 1rem;
}

/********** 按钮 **********/
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.75rem 1.5rem;
	font-size: 1rem;
	font-weight: 500;
	border-radius: var(--radius-md);
	cursor: pointer;
	transition: var(--transition);
	gap: 0.5rem;
	border: 1px solid transparent;
}
.btn:active {
	transform: scale(0.98);
}
.btn--pri {
	background-color: var(--text-primary);
	color: #fff;
}
.btn--pri:hover {
	background-color: var(--primary-color);
	box-shadow: var(--shadow-md);
}
.btn--sec {
	background-color: white;
	color: var(--text-primary);
	border-color: var(--border-color);
}
.btn--sec:hover {
	border-color: var(--text-primary);
	background-color: var(--bg-secondary);
}

/********** Topbar **********/
.topbar {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	backface-visibility: hidden;
	z-index: 100;
	background-color: rgba(255, 255, 255, 0.8);
	backdrop-filter: blur(12px);
	-webkit-backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--border-color);
	transition: var(--transition);
}

.topbar__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	height: 4.5rem;
}

.topbar__brand {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	font-weight: 700;
	font-size: 1.25rem;
}

.topbar__logo {
	width: 2.5rem;
	height: 2.5rem;
	/*display: flex;*/
}

.topbar__links {
	display: flex;
	gap: 2rem;
}

.topbar__link {
	font-size: 0.9375rem;
	font-weight: 500;
	color: var(--text-secondary);
}

.topbar__link:hover {
	color: var(--text-primary);
}

.topbar__cta {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.5rem 1rem;
	background-color: var(--text-primary);
	color: white;
	border-radius: var(--radius-md);
	font-size: 0.875rem;
	font-weight: 500;
	transition: var(--transition);
}

.topbar__cta:hover {
	background-color: var(--primary-color);
}

.topbar__burger {
	display: none;
	background: none;
	border: none;
	cursor: pointer;
	flex-direction: column;
	gap: 5px;
	width: 24px;
}

.topbar__burger span {
	display: block;
	width: 100%;
	height: 2px;
	background-color: var(--text-primary);
	transition: var(--transition);
}

/********** 移动端导航栏 **********/
.mob-nav {
	position: fixed;
	top: 4.5rem;
	left: 0;
	width: 100%;
	background-color: white;
	border-bottom: 1px solid var(--border-color);
	padding: 1rem 2rem;
	display: flex;
	flex-direction: column;
	gap: 1rem;
	z-index: 99;
	opacity: 0;
	visibility: hidden;
	transition: var(--transition);
}

.mob-nav.active {
	opacity: 1;
	visibility: visible;
}

.mob-nav a:not(.btn) {
	font-weight: 500;
	padding: 0.5rem 0;
	border-bottom: 1px solid var(--border-light);
}

/********** Hero部分 **********/
.hero {
	padding: 10rem 0 6rem;
	position: relative;
	overflow: hidden;
}

.hero::before {
	content: '';
	position: absolute;
	top: -50%;
	left: 50%;
	transform: translateX(-50%);
	width: 100vw;
	height: 100vw;
	background: radial-gradient(circle, var(--primary-light) 0%, transparent 60%);
	z-index: -1;
	opacity: 0.5;
}

.hero__actions {
	display: flex;
	gap: 1rem;
	justify-content: center;
	margin-bottom: 4rem;
}

/* Mockup Browser */
.hero__mockup {
	position: relative;
	margin: 0 auto;
	max-width: 1000px;
	border-radius: var(--radius-xl);
	background: var(--bg-card);
	border: 1px solid var(--border-color);
	box-shadow: var(--shadow-lg);
	overflow: hidden;
}

.mockup-header {
	height: 2.5rem;
	background: var(--bg-secondary);
	border-bottom: 1px solid var(--border-color);
	display: flex;
	align-items: center;
	padding: 0 1rem;
	gap: 0.5rem;
}

.mockup-dot {
	width: 10px;
	height: 10px;
	border-radius: 50%;
	background-color: var(--border-color);
}

.mockup-dot:nth-child(1) {
	background-color: #ff5f56;
}

.mockup-dot:nth-child(2) {
	background-color: #ffbd2e;
}

.mockup-dot:nth-child(3) {
	background-color: #27c93f;
}

.mockup-body {
	padding: 2rem;
	color: var(--text-secondary);
	font-family: monospace;
	font-size: 0.875rem;
	background: #f8f9fa;
	min-height: 300px;
}

.mockup-body span {
	color: var(--primary-color);
}

.mockup-body i {
	color: #10b981;
	font-style: normal;
}

.mockup-body b {
	color: #f59e0b;
	font-weight: normal;
}

/* STATS BAR */
.stats {
	border-top: 1px solid var(--border-color);
	border-bottom: 1px solid var(--border-color);
	background-color: white;
	padding: 2rem 0;
}

.stats-grid {
	display: grid;
	grid-template-columns: repeat(4, auto);
	gap: 2rem;
	text-align: center;
}

.stat-val {
	font-size: 1.5rem;
	font-weight: 700;
	color: var(--text-primary);
	margin-bottom: 0.25rem;
}

.stat-lbl {
	font-size: 0.875rem;
	color: var(--text-secondary);
}

/* BENTO GRID (FEATURES) */
.bento-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1.5rem;
	margin-top: 4rem;
}

.bento-card {
	background: var(--bg-card);
	border: 1px solid var(--border-color);
	border-radius: var(--radius-lg);
	padding: 2rem;
	transition: var(--transition);
}

/* NOTE: NO translateY, ONLY scale for subtle hover effect */
.bento-card:hover {
	border-color: var(--primary-color);
	box-shadow: var(--shadow-md);
}

.bento-icon {
	width: 3rem;
	height: 3rem;
	border-radius: var(--radius-md);
	background: var(--bg-secondary);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 1.25rem;
	color: var(--primary-color);
	margin-bottom: 1.5rem;
}

.bento-card.large {
	grid-column: span 2;
}

.bento-card .h3 {
	margin-bottom: 0.5rem;
}

.bento-card p {
	color: var(--text-secondary);
	font-size: 0.9375rem;
}

/* SCENARIO CARDS */
.scenario-grid {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 1.5rem;
	margin-top: 3rem;
}

.scenario-card {
	display: flex;
	align-items: flex-start;
	gap: 1.5rem;
	background: var(--bg-card);
	border: 1px solid var(--border-color);
	border-radius: var(--radius-lg);
	padding: 2rem;
}

.s-icon {
	flex-shrink: 0;
	width: 3.5rem;
	height: 3.5rem;
	border-radius: 50%;
	background: var(--primary-light);
	color: var(--primary-color);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 1.5rem;
}

.scenario-card p {
	color: var(--text-secondary);
	margin-top: 0.5rem;
}

.scenario-tag {
	display: inline-block;
	margin-top: 1rem;
	font-size: 0.75rem;
	font-weight: 600;
	padding: 0.25rem 0.5rem;
	border-radius: var(--radius-md);
	background: var(--bg-secondary);
	color: var(--text-primary);
}

/* TIMELINE (GUIDE) */
.timeline {
	max-width: 800px;
	margin: 4rem auto 0;
	position: relative;
}

.timeline::before {
	content: '';
	position: absolute;
	top: 0;
	bottom: 0;
	left: 1.5rem;
	width: 2px;
	background: var(--border-color);
}

.time-item {
	position: relative;
	padding-left: 4.5rem;
	margin-bottom: 3rem;
}

.time-item:last-child {
	margin-bottom: 0;
}

.time-num {
	position: absolute;
	left: 0;
	top: 0;
	width: 3rem;
	height: 3rem;
	border-radius: 50%;
	background: var(--bg-card);
	border: 2px solid var(--primary-color);
	color: var(--primary-color);
	display: flex;
	align-items: center;
	justify-content: center;
	font-weight: 700;
	font-size: 1.25rem;
	z-index: 2;
}

.time-content {
	background: var(--bg-card);
	border: 1px solid var(--border-color);
	border-radius: var(--radius-lg);
	padding: 1.5rem;
}

.time-content h4 {
	font-size: 1.125rem;
	margin-bottom: 0.5rem;
}

.time-content p {
	color: var(--text-secondary);
	font-size: 0.9375rem;
}
.time-content ul {
	list-style: disc;
	padding-left: 16px;
	color: var(--text-secondary);
}
#more-guide-link{
	text-align: center;
	margin-top: 2rem;
	color: var(--text-secondary);
}
#more-guide-link a{
	color: var(--a-color);
}

/* FAQ */
.faq-grid {
	max-width: 800px;
	margin: 3rem auto 0;
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.faq-item {
	border: 1px solid var(--border-color);
	border-radius: var(--radius-md);
	background: var(--bg-card);
	overflow: hidden;
}

.faq-q {
	width: 100%;
	text-align: left;
	background: none;
	border: none;
	padding: 1.5rem;
	font-size: 1rem;
	font-weight: 600;
	color: var(--text-primary);
	display: flex;
	justify-content: space-between;
	align-items: center;
	cursor: pointer;
	font-family: var(--font-family);
}

.faq-icon {
	transition: transform 0.3s ease;
	color: var(--text-secondary);
}

.faq-item.active .faq-icon {
	transform: rotate(180deg);
}

.faq-a {
	padding: 0 1.5rem;
	max-height: 0;
	opacity: 0;
	overflow: hidden;
	transition: all 0.3s ease;
	color: var(--text-secondary);
	font-size: 0.9375rem;
}

.faq-item.active .faq-a {
	padding: 0 1.5rem 1.5rem;
	max-height: 500px;
	opacity: 1;
}

/* DOWNLOAD PAGE (Specifics) */
.dl-card {
	max-width: 800px;
	margin: 2rem auto 0;
	background: var(--bg-card);
	border: 1px solid var(--border-color);
	border-radius: var(--radius-xl);
	padding: 3rem 2rem;
	text-align: center;
	box-shadow: var(--shadow-md);
	position: relative;
	overflow: hidden;
}

.dl-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 4px;
	background: linear-gradient(90deg, var(--primary-color), var(--text-primary));
}

.dl-details {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1rem;
	margin: 2rem 0;
	padding: 2rem 0;
	border-top: 1px solid var(--border-color);
	border-bottom: 1px solid var(--border-color);
}

.sys-req {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 2rem;
	margin-top: 3rem;
	text-align: left;
}

.sys-req-box {
	background: var(--bg-secondary);
	border-radius: var(--radius-lg);
	padding: 2rem;
}

.sys-req-col {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.req-item {
	display: flex;
	justify-content: space-between;
	border-bottom: 1px solid var(--border-color);
	padding-bottom: 0.5rem;
}

.req-item span:first-child {
	color: var(--text-secondary);
	font-weight: 500;
	font-size: 0.875rem;
}

.req-item span:last-child {
	font-weight: 600;
	font-size: 0.875rem;
}

/* FOOTER (Light Variant) */
.site-ft {
	background-color: var(--bg-secondary);
	border-top: 1px solid var(--border-color);
	padding: 4rem 0 2rem;
}

.site-ft-grid {
	display: grid;
	grid-template-columns: 2fr 1fr 1fr 1fr;
	gap: 2rem;
	margin-bottom: 4rem;
}

.ft-brand {
	font-weight: 700;
	font-size: 1.25rem;
	margin-bottom: 0.5rem;
}

.ft-brand span {
	color: var(--primary-color);
}

.ft-brand-desc {
	color: var(--text-secondary);
	font-size: 0.875rem;
}

.ft-h4 {
	font-size: 0.9375rem;
	font-weight: 600;
	margin-bottom: 1rem;
	color: var(--text-primary);
}

.ft-links li {
	margin-bottom: 0.5rem;
}

.ft-links a,
.ft-links span {
	color: var(--text-secondary);
	font-size: 0.875rem;
}

.ft-links a:hover {
	color: var(--primary-color);
}

.ft-bot {
	border-top: 1px solid var(--border-color);
	padding-top: 2rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: var(--text-secondary);
	font-size: 0.875rem;
}

/* ANIMATIONS */
/* Only fade-in, no translate! */
.fade-up {
	/*opacity: 0;*/
	transition: opacity 0.8s ease;
}

.fade-up.in-view {
	opacity: 1;
}

/*Back to top*/
#backto-top {
	position: fixed;
	bottom: 2rem;
	right: 2rem;
	z-index: 998;
	/* 优雅的视觉呈现 */
	display: block;
	width: 3.2rem;
	height: 3.2rem;
	background: rgba(255, 255, 255, 0.9);
	backdrop-filter: blur(8px);
	border-radius: 2rem;
	box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(255,255,255,0.6);
	transition: all 0.25s ease-out;
	/* 箭头居中 */
	display: flex;
	align-items: center;
	justify-content: center;
	/* 文字样式 */

	cursor: pointer;
}

/* 箭头图标 + 优雅微交互: 使用伪元素制作向上的箭头，简洁现代 */
#backto-top::before {
	content: "↑";
	font-size: 1.8rem;
	font-weight: 300;
	line-height: 1;
	color: #8b5cf6;
}

/* 悬浮效果: 更明显更优雅 */
#backto-top:hover {
	background: white;
	box-shadow: 0 18px 28px -8px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(139,92,246,0.3);
}

#backto-top:hover::before {
	transform: translateY(-2px);
}

/* 增加一个可选的小文字提示 */
#backto-top span {
	display: none;
}

/* RESPONSIVE */
@media (max-width: 992px) {

	.bento-grid,
	.stats-grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.bento-card.large {
		grid-column: span 1;
	}

	.sys-req {
		grid-template-columns: 1fr;
	}

	.site-ft-grid {
		grid-template-columns: 1fr 1fr;
	}

	.dl-details {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 768px) {

	.topbar__links,
	.topbar__cta {
		display: none;
	}

	.topbar__burger {
		display: flex;
	}

	.bento-grid,
	.scenario-grid,
	.stats-grid,
	.site-ft-grid {
		grid-template-columns: 1fr;
	}

	.dl-details {
		grid-template-columns: 1fr;
	}

	.hero {
		padding: 8rem 0 4rem;
	}

	.ft-bot {
		flex-direction: column;
		gap: 1rem;
		text-align: center;
	}
}

@media (max-width: 640px) {
	#backto-top {
		bottom: 1.2rem;
		right: 1.2rem;
		width: 2.8rem;
		height: 2.8rem;
	}
	#backto-top::before {
		font-size: 1.6rem;
	}
}