/* ============ Design tokens ============ */
:root {
	--font-body:
		-apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC",
		"Hiragino Sans GB", "Microsoft YaHei", sans-serif;
	--font-display:
		-apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
		"PingFang SC", "Hiragino Sans GB", sans-serif;
	--radius-sm: 12px;
	--radius-md: 24px;
	--radius-lg: 36px;
	--transition-layout: 640ms cubic-bezier(0.22, 1, 0.36, 1);
	--transition-ui: 220ms ease;
}

/* 深色（默认） */
body[data-theme="dark"] {
	--bg: #12141a;
	--bg-soft: #171a21;
	--surface: #1a1e27;
	--surface-soft: #20252f;
	--border: rgba(255, 255, 255, 0.08);
	--border-strong: rgba(255, 255, 255, 0.16);
	--text: #f2f4f8;
	--text-soft: rgba(242, 244, 248, 0.62);
	--accent: #ff8a3d;
	--accent-strong: #ff9d5c;
	--accent-ink: #20150a;
	--shadow-lg: 0 30px 84px rgba(0, 0, 0, 0.34);
	--shadow-md: 0 18px 42px rgba(0, 0, 0, 0.28);
	--grid-line: rgba(255, 255, 255, 0.035);
	--mist-1: rgba(92, 132, 255, 0.1);
	--mist-2: rgba(255, 138, 61, 0.07);
	--mist-3: rgba(148, 110, 255, 0.07);
	color-scheme: dark;
}

/* 浅色 */
body[data-theme="light"] {
	--bg: #f3f5f9;
	--bg-soft: #e9edf4;
	--surface: #ffffff;
	--surface-soft: #f1f4f9;
	--border: rgba(23, 34, 50, 0.1);
	--border-strong: rgba(23, 34, 50, 0.18);
	--text: #172232;
	--text-soft: rgba(23, 34, 50, 0.62);
	--accent: #d85a20;
	--accent-strong: #c04e18;
	--accent-ink: #ffffff;
	--shadow-lg: 0 28px 72px rgba(103, 124, 153, 0.2);
	--shadow-md: 0 18px 40px rgba(103, 124, 153, 0.16);
	--grid-line: rgba(23, 34, 50, 0.05);
	--mist-1: rgba(92, 132, 255, 0.08);
	--mist-2: rgba(216, 90, 32, 0.05);
	--mist-3: rgba(148, 110, 255, 0.05);
	color-scheme: light;
}

/* ============ Reset ============ */
* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	min-width: 320px;
	height: 100%;
}

body {
	min-height: 100%;
	background: var(--bg);
	color: var(--text);
	font-family: var(--font-body);
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	overflow-x: hidden;
	transition:
		background-color var(--transition-layout),
		color var(--transition-layout);
}

button {
	font: inherit;
	color: inherit;
	background: none;
	border: none;
	cursor: pointer;
}

a {
	color: inherit;
}

img {
	display: block;
}

/* ============ 背景氛围 ============ */
.page-atmosphere {
	position: fixed;
	inset: 0;
	z-index: 0;
	overflow: hidden;
	pointer-events: none;
}

.page-mist {
	position: absolute;
	border-radius: 50%;
	filter: blur(90px);
	opacity: 0.9;
	animation: mist-drift 26s ease-in-out infinite alternate;
}

.page-mist-one {
	width: 55vw;
	height: 55vw;
	top: -18vw;
	left: -12vw;
	background: var(--mist-1);
}

.page-mist-two {
	width: 46vw;
	height: 46vw;
	bottom: -16vw;
	right: -10vw;
	background: var(--mist-2);
	animation-delay: -9s;
}

.page-mist-three {
	width: 34vw;
	height: 34vw;
	top: 34%;
	left: 58%;
	background: var(--mist-3);
	animation-delay: -17s;
}

@keyframes mist-drift {
	from {
		transform: translate3d(0, 0, 0) scale(1);
	}
	to {
		transform: translate3d(4vw, 2vw, 0) scale(1.08);
	}
}

.page-haze {
	position: absolute;
	inset: 0;
	background: radial-gradient(
		ellipse 90% 62% at 50% 42%,
		transparent 0%,
		var(--bg) 100%
	);
}

.page-grid {
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(var(--grid-line) 1px, transparent 1px),
		linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
	background-size: 104px 104px;
	mask-image: linear-gradient(
		to top,
		transparent 8%,
		black 55%,
		transparent 100%
	);
	-webkit-mask-image: linear-gradient(
		to top,
		transparent 8%,
		black 55%,
		transparent 100%
	);
}

.page-vignette {
	position: fixed;
	inset: 0;
	z-index: 2;
	pointer-events: none;
	background: radial-gradient(
		ellipse 105% 88% at 50% 46%,
		transparent 62%,
		rgba(0, 0, 0, 0.28) 100%
	);
}

body[data-theme="light"] .page-vignette {
	background: radial-gradient(
		ellipse 105% 88% at 50% 46%,
		transparent 66%,
		rgba(23, 34, 50, 0.08) 100%
	);
}

/* ============ 开场序列 ============ */
.intro {
	position: fixed;
	inset: 0;
	z-index: 50;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 26px;
	background: var(--bg);
	transition:
		opacity 700ms ease 120ms,
		visibility 700ms ease 120ms;
}

.intro.hidden {
	opacity: 0;
	visibility: hidden;
	pointer-events: none;
}

.intro-brand {
	display: flex;
	align-items: center;
	gap: 18px;
}

.intro-brand-dot {
	width: clamp(14px, 2.6vw, 20px);
	height: clamp(14px, 2.6vw, 20px);
	border-radius: 50%;
	background: var(--accent);
	box-shadow: 0 0 24px color-mix(in srgb, var(--accent) 55%, transparent);
	animation: brand-pop 640ms cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.intro-brand-text {
	font-family: var(--font-display);
	font-size: clamp(2.6rem, 9vw, 4rem);
	font-weight: 800;
	letter-spacing: 0.1em;
	background: linear-gradient(120deg, var(--text) 20%, var(--accent) 90%);
	-webkit-background-clip: text;
	background-clip: text;
	-webkit-text-fill-color: transparent;
	color: transparent;
	animation: brand-pop 640ms cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes brand-pop {
	from {
		opacity: 0;
		transform: translateY(12px) scale(0.96);
	}
	to {
		opacity: 1;
		transform: translateY(0) scale(1);
	}
}

.intro-copy {
	font-family: var(--font-display);
	font-size: clamp(1.4rem, 4.6vw, 2.2rem);
	font-weight: 650;
	letter-spacing: 0.02em;
	min-height: 1.4em;
	opacity: 0;
	animation: fade-up 600ms ease 700ms forwards;
}

.intro-subtitle {
	color: var(--text-soft);
	font-size: clamp(0.95rem, 2.4vw, 1.1rem);
	opacity: 0;
	animation: fade-up 600ms ease 1.35s forwards;
}

@keyframes fade-up {
	from {
		opacity: 0;
		transform: translateY(14px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.intro-copy-typed::after {
	content: "▍";
	color: var(--accent);
	animation: caret-blink 1s step-end infinite;
}

@keyframes caret-blink {
	50% {
		opacity: 0;
	}
}

.intro.hidden .intro-copy-typed::after {
	animation: none;
}

/* ============ 顶栏 ============ */
.topbar {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 30;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 18px clamp(20px, 4vw, 44px);
	opacity: 0;
	transition:
		opacity 700ms ease,
		transform 700ms ease;
	transform: translateY(-8px);
}

body.ready .topbar {
	opacity: 1;
	transform: translateY(0);
}

.brand-logo {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	padding: 8px 14px;
	border-radius: 999px;
	background: var(--surface);
	border: 1px solid var(--border);
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
	transition:
		transform var(--transition-ui),
		border-color var(--transition-ui);
}

.brand-logo:hover {
	transform: translateY(-1px);
	border-color: var(--border-strong);
}

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

.brand-word {
	font-family: var(--font-display);
	font-size: 0.95rem;
	font-weight: 750;
	letter-spacing: 0.14em;
}

.topbar-controls {
	display: flex;
	gap: 8px;
}

.control-button {
	min-height: 38px;
	padding: 0 16px;
	border-radius: 999px;
	border: 1px solid var(--border);
	background: var(--surface);
	font-size: 0.82rem;
	font-weight: 650;
	color: var(--text-soft);
	transition: all var(--transition-ui);
}

.control-button:hover {
	color: var(--text);
	border-color: var(--border-strong);
	transform: translateY(-1px);
}

/* ============ 主展示区 ============ */
.app-shell {
	position: relative;
	z-index: 10;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	opacity: 0;
	transition: opacity 900ms ease 500ms;
}

body.ready .app-shell {
	opacity: 1;
}

.showcase {
	flex: 1;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 56px;
	padding: 96px clamp(20px, 4vw, 44px) 40px;
}

/* ---------- 产品卡 ---------- */
.paper {
	width: min(760px, 100%);
	border-radius: var(--radius-lg);
	background: var(--surface);
	border: 1px solid var(--border);
	box-shadow: var(--shadow-lg);
	overflow: hidden;
	transition:
		transform 400ms cubic-bezier(0.22, 1, 0.36, 1),
		opacity 300ms ease;
}

.paper.switching {
	transform: translateY(10px) scale(0.985);
	opacity: 0;
}

.paper-titlebar {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 14px 18px;
	background: var(--surface-soft);
	border-bottom: 1px solid var(--border);
}

.paper-light {
	width: 11px;
	height: 11px;
	border-radius: 50%;
}

.paper-light-red {
	background: #ff5f57;
}

.paper-light-yellow {
	background: #febc2e;
}

.paper-light-green {
	background: #28c840;
}

.paper-address {
	flex: 1;
	margin-left: 10px;
	padding: 5px 14px;
	border-radius: 999px;
	background: var(--surface);
	border: 1px solid var(--border);
	color: var(--text-soft);
	font-size: 0.8rem;
	font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
	text-align: center;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.paper-body {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	padding: clamp(36px, 6vw, 60px) clamp(24px, 6vw, 56px) clamp(40px, 6vw, 64px);
}

.paper-logo-shell {
	width: 108px;
	height: 108px;
	padding: 8px;
	border-radius: 28px;
	background: linear-gradient(145deg, var(--surface-soft), var(--surface));
	border: 1px solid var(--border);
	box-shadow: var(--shadow-md);
	display: flex;
	align-items: center;
	justify-content: center;
	margin-bottom: 26px;
}

.paper-logo {
	width: 88px;
	height: 88px;
	border-radius: 22px;
	object-fit: cover;
}

.paper-meta {
	display: flex;
	align-items: center;
	gap: 10px;
	margin-bottom: 16px;
}

.paper-tag {
	padding: 4px 12px;
	border-radius: 999px;
	background: color-mix(in srgb, var(--accent) 14%, transparent);
	color: var(--accent);
	font-size: 0.75rem;
	font-weight: 700;
	letter-spacing: 0.05em;
}

.paper-platform {
	padding: 4px 12px;
	border-radius: 999px;
	background: var(--surface-soft);
	border: 1px solid var(--border);
	color: var(--text-soft);
	font-size: 0.75rem;
	font-weight: 650;
}

.paper-title {
	font-family: var(--font-display);
	font-size: clamp(1.9rem, 5vw, 2.6rem);
	font-weight: 750;
	letter-spacing: -0.01em;
	margin-bottom: 8px;
}

.paper-headline {
	font-family: var(--font-display);
	font-size: clamp(1.05rem, 2.6vw, 1.3rem);
	font-weight: 600;
	color: var(--accent);
	margin-bottom: 18px;
	max-width: 32em;
}

.paper-description {
	color: var(--text-soft);
	font-size: 0.97rem;
	max-width: 34em;
	margin-bottom: 32px;
}

.paper-actions {
	display: flex;
	gap: 12px;
}

.paper-link {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 12px 26px;
	border-radius: 999px;
	background: var(--accent);
	color: var(--accent-ink);
	font-weight: 700;
	font-size: 0.92rem;
	text-decoration: none;
	transition:
		transform var(--transition-ui),
		box-shadow var(--transition-ui);
}

.paper-link:hover {
	transform: translateY(-2px);
	box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 34%, transparent);
}

/* ---------- Dock ---------- */
.dock {
	display: flex;
	align-items: flex-end;
	gap: 18px;
	padding: 12px 22px;
	border-radius: var(--radius-lg);
	background: var(--surface);
	border: 1px solid var(--border);
	box-shadow: var(--shadow-lg);
}

.dock-item {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 58px;
	height: 58px;
	border-radius: 16px;
	cursor: pointer;
	transition: transform 180ms cubic-bezier(0.34, 1.56, 0.64, 1);
	outline: none;
}

.dock-item:hover,
.dock-item:focus-visible {
	transform: translateY(-10px) scale(1.12);
}

.dock-item[aria-pressed="true"] {
	transform: translateY(-4px) scale(1.05);
}

.dock-item[aria-pressed="true"]::after {
	content: "";
	position: absolute;
	bottom: 4px;
	left: 50%;
	width: 5px;
	height: 5px;
	border-radius: 50%;
	background: var(--accent);
	transform: translateX(-50%);
}

.dock-icon {
	width: 100%;
	height: 100%;
	border-radius: 16px;
	object-fit: cover;
	box-shadow: 0 6px 18px rgba(0, 0, 0, 0.24);
}

body[data-theme="light"] .dock-icon {
	box-shadow: 0 6px 18px rgba(103, 124, 153, 0.22);
}

.dock-tooltip {
	position: absolute;
	bottom: calc(100% + 12px);
	left: 50%;
	transform: translateX(-50%) translateY(6px);
	padding: 6px 14px;
	border-radius: 10px;
	background: var(--text);
	color: var(--bg);
	font-size: 0.8rem;
	font-weight: 650;
	white-space: nowrap;
	opacity: 0;
	pointer-events: none;
	transition:
		opacity 180ms ease,
		transform 180ms ease;
}

.dock-tooltip::after {
	content: "";
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translateX(-50%);
	border: 5px solid transparent;
	border-top-color: var(--text);
}

.dock-item:hover .dock-tooltip,
.dock-item:focus-visible .dock-tooltip {
	opacity: 1;
	transform: translateX(-50%) translateY(0);
}

/* ---------- 页脚 ---------- */
.site-footer {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding: 0 clamp(20px, 4vw, 44px) 22px;
	color: var(--text-soft);
	font-size: 0.8rem;
}

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

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

/* ============ 响应式 ============ */
@media (max-width: 640px) {
	.showcase {
		gap: 40px;
		padding-top: 84px;
		justify-content: flex-start;
	}

	.dock {
		gap: 12px;
		padding: 10px 16px;
	}

	.dock-item {
		width: 50px;
		height: 50px;
		border-radius: 14px;
	}

	.paper-body {
		padding: 32px 20px 36px;
	}

	.paper-logo-shell {
		width: 92px;
		height: 92px;
	}

	.paper-logo {
		width: 74px;
		height: 74px;
	}

	.site-footer {
		flex-direction: column;
		gap: 6px;
		text-align: center;
		padding-bottom: 18px;
	}
}

@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
	}
}