:root {
	/* 默认使用黑暗模式 */
	--bg-grid-color: #2a2a2a;
	--bg-base-color: #1a1a1a;
	--text-primary: #e0e0e0;
	--text-secondary: rgba(255, 255, 255, 0.85);
	--text-tertiary: rgba(255, 255, 255, 0.65);
	--text-muted: rgba(255, 255, 255, 0.5);
	--text-link: rgba(255, 255, 255, 0.75);
	--text-link-hover: rgba(255, 255, 255, 0.95);

	--card-bg: #2d2d2d;
	--card-border: rgba(255, 255, 255, 0.1);
	--card-shadow: rgba(0, 0, 0, 0.4);
	--card-shadow-drag: rgba(0, 0, 0, 0.6);
	--card-shadow-max: rgba(0, 0, 0, 0.7);
	--card-header-bg: rgba(45, 45, 45, 0.8);

	--control-border: rgba(255, 255, 255, 0.15);
	--control-focus: rgba(255, 255, 255, 0.3);
	--control-icon: rgba(255, 255, 255, 0.7);
	--control-icon-close: rgba(0, 0, 0, 0.8);

	/* 卡片颜色变量（黑暗模式） */
	--card-color-0: #4a3942;
	--card-color-1: #2f4858;
	--card-color-2: #5a4a3a;
	--card-color-3: #3a4a3a;
	--card-color-4: #473a5a;
	--card-color-5: #4a4a38;
	--card-color-6: #364852;
	--card-color-7: #52385a;
}

/* 浅色模式配色方案 */
body.light-theme {
	--bg-grid-color: #eee;
	--bg-base-color: #fff;
	--text-primary: #333;
	--text-secondary: rgba(0, 0, 0, 0.72);
	--text-tertiary: rgba(0, 0, 0, 0.55);
	--text-muted: rgba(0, 0, 0, 0.5);
	--text-link: rgba(0, 0, 0, 0.7);
	--text-link-hover: rgba(0, 0, 0, 0.9);

	--card-bg: #fff;
	--card-border: rgba(0, 0, 0, 0.08);
	--card-shadow: rgba(0, 0, 0, 0.18);
	--card-shadow-drag: rgba(0, 0, 0, 0.35);
	--card-shadow-max: rgba(0, 0, 0, 0.4);
	--card-header-bg: rgba(255, 255, 255, 0.7);

	--control-border: rgba(0, 0, 0, 0.08);
	--control-focus: rgba(0, 0, 0, 0.25);
	--control-icon: rgba(0, 0, 0, 0.6);
	--control-icon-close: rgba(0, 0, 0, 0.7);

	/* 卡片颜色变量（浅色模式） */
	--card-color-0: #ffe0e3;
	--card-color-1: #c7f0ff;
	--card-color-2: #ffd8a8;
	--card-color-3: #d9f2d9;
	--card-color-4: #e5d7ff;
	--card-color-5: #f9f7d9;
	--card-color-6: #d2f0f8;
	--card-color-7: #ffd4f5;
}

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

html {
	touch-action: pan-x pan-y;
	-ms-touch-action: pan-x pan-y;
}

body {
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	background-color: var(--bg-base-color);
	background-image: linear-gradient(0deg, var(--bg-grid-color) 1px, transparent 0),
		linear-gradient(90deg, var(--bg-grid-color) 1px, transparent 0);
	background-size: 30px 30px;
	color: var(--text-primary);
	min-height: 100dvh;
	overflow: hidden;
	touch-action: pan-x pan-y;
	-ms-touch-action: pan-x pan-y;
	position: fixed;
	width: 100%;
	height: 100%;
}

body.is-mobile {
	overflow: hidden;
}

#board {
	position: relative;
	width: 100vw;
	height: 100dvh;
	overflow: hidden;
}

body.is-mobile #board {
	height: 100dvh;
	overflow: hidden;
}

.card {
	position: absolute;
	width: 220px;
	border-radius: 12px;
	/* 较轻的阴影以减少重绘开销 */
	box-shadow: 0 12px 24px var(--card-shadow);
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	overflow: hidden;
	opacity: 0;
	transform-origin: center;
	/* 提示浏览器进行合成层优化 */
	will-change: transform, opacity;
	/* 限制布局/绘制影响范围 */
	contain: layout paint;
	transition: transform 0.35s ease, opacity 0.35s ease, left 0.35s ease,
		top 0.35s ease, width 0.35s ease, height 0.35s ease,
		border-radius 0.35s ease, background-color 0.3s ease;
}

/* 卡片颜色类 */
.card.color-0 { background: var(--card-color-0); }
.card.color-1 { background: var(--card-color-1); }
.card.color-2 { background: var(--card-color-2); }
.card.color-3 { background: var(--card-color-3); }
.card.color-4 { background: var(--card-color-4); }
.card.color-5 { background: var(--card-color-5); }
.card.color-6 { background: var(--card-color-6); }
.card.color-7 { background: var(--card-color-7); }

.card.dragging {
	transition: none;
	box-shadow: 0 22px 45px var(--card-shadow-drag);
}

.card.maximized {
	box-shadow: 0 28px 60px var(--card-shadow-max);
}

.card-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 10px 12px;
	background: rgba(0, 0, 0, 0.15);
	cursor: grab;
	user-select: none;
	touch-action: none;
}

body.light-theme .card-header {
	background: rgba(255, 255, 255, 0.3);
}

.card-header.dragging {
	cursor: grabbing;
}

.window-controls {
	display: flex;
	align-items: center;
	gap: 6px;
}

.window-controls .control {
	position: relative;
	width: 12px;
	height: 12px;
	border-radius: 50%;
	border: 1px solid var(--control-border);
	background: #ccc;
	outline: none;
	padding: 0;
	display: inline-flex;
	align-items: center;
	justify-content: center;
}

.window-controls .control.close {
	cursor: pointer;
}

.window-controls .control.minimize,
.window-controls .control.maximize {
	cursor: default;
	pointer-events: none;
}

/* 可见的键盘焦点样式（无障碍改进） */
.window-controls .control:focus-visible {
	box-shadow: 0 0 0 3px var(--control-focus);
}

.window-controls .control.close {
	background: #ff5f57;
	border-color: #e0443e;
}

.window-controls .control.minimize {
	background: #febb2e;
	border-color: #dea123;
}

.window-controls .control.maximize {
	background: #28c840;
	border-color: #1aab2c;
}

.window-controls .control::after {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	opacity: 0;
	transition: opacity 0.2s ease;
}

.card-header:hover .window-controls .control::after {
	opacity: 0.8;
}

.window-controls .control.close::after {
	content: '×';
	width: auto;
	height: auto;
	background: none;
	font-size: 10px;
	line-height: 1;
	font-weight: 700;
	color: var(--control-icon-close);
}

.window-controls .control.minimize::after {
	width: 6px;
	height: 2px;
	background: var(--control-icon);
}

.window-controls .control.maximize::after {
	width: 6px;
	height: 6px;
	background: linear-gradient(
		45deg,
		var(--control-icon) 0%,
		var(--control-icon) 45%,
		transparent 45%,
		transparent 55%,
		var(--control-icon) 55%,
		var(--control-icon) 100%
	);
}

.card-title {
	font-size: 13px;
	font-weight: 600;
	color: rgba(255, 255, 255, 0.75);
	padding-left: 10px;
	flex: 1;
}

body.light-theme .card-title {
	color: rgba(0, 0, 0, 0.55);
}

.card-body {
	padding: 16px;
	font-size: 16px;
	line-height: 1.4;
	font-weight: 600;
	color: rgba(255, 255, 255, 0.95);
}

body.light-theme .card-body {
	color: rgba(0, 0, 0, 0.72);
}

@media (max-width: 768px) {
	.card {
		width: 140px;
		border-radius: 10px;
	}

	.card-body {
		padding: 10px;
		font-size: 12px;
	}

	.card-title {
		font-size: 11px;
	}

	.card-header {
		padding: 8px 10px;
	}

	.window-controls .control {
		width: 10px;
		height: 10px;
	}
}

.footer {
	position: fixed;
	bottom: 0;
	left: 0;
	right: 0;
	padding: 12px 20px;
	text-align: center;
	font-size: 13px;
	color: var(--text-muted);
	background: transparent;
	z-index: 1000;
}

.footer-line {
	margin: 4px 0;
}

.footer a {
	color: var(--text-link);
	text-decoration: none;
	font-weight: 600;
	transition: color 0.2s ease;
	display: inline-flex;
	align-items: center;
}

.footer a:hover {
	color: var(--text-link-hover);
}

@media (max-width: 768px) {
	.footer {
		font-size: 11px;
		padding: 10px 16px;
	}
}

/* 主题切换按钮（仅在引导页显示） */
.theme-toggle {
	position: fixed;
	top: 20px;
	right: 20px;
	width: 48px;
	height: 48px;
	border-radius: 50%;
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	box-shadow: 0 4px 12px var(--card-shadow);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 10002;
	transition: all 0.3s ease;
	outline: none;
}

.theme-toggle:hover {
	transform: scale(1.1);
	box-shadow: 0 6px 16px var(--card-shadow-drag);
}

.theme-toggle:active {
	transform: scale(0.95);
}

.theme-toggle:focus-visible {
	box-shadow: 0 0 0 3px var(--control-focus);
}

.theme-toggle-icon {
	font-size: 24px;
	line-height: 1;
	transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-toggle-icon {
	transform: rotate(20deg);
}

/* 音乐控制按钮（仅在主应用显示） */
.music-toggle {
	position: fixed;
	top: 20px;
	right: 20px;
	width: 48px;
	height: 48px;
	border-radius: 50%;
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	box-shadow: 0 4px 12px var(--card-shadow);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 10002;
	transition: all 0.3s ease;
	outline: none;
}

.music-toggle:hover {
	transform: scale(1.1);
	box-shadow: 0 6px 16px var(--card-shadow-drag);
}

.music-toggle:active {
	transform: scale(0.95);
}

.music-toggle:focus-visible {
	box-shadow: 0 0 0 3px var(--control-focus);
}

.music-toggle-icon {
	font-size: 24px;
	line-height: 1;
	transition: transform 0.3s ease;
}

/* 播放中的旋转动画 */
.music-toggle.playing .music-toggle-icon {
	animation: musicRotate 10s linear infinite;
}

/* 暂停时保持当前旋转角度 */
.music-toggle.paused .music-toggle-icon {
	animation-play-state: paused;
}

@keyframes musicRotate {
	from {
		transform: rotate(0deg);
	}
	to {
		transform: rotate(360deg);
	}
}

/* 全屏切换按钮 */
.fullscreen-toggle {
	position: fixed;
	bottom: 20px;
	right: 20px;
	width: 48px;
	height: 48px;
	border-radius: 50%;
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	box-shadow: 0 4px 12px var(--card-shadow);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 10002;
	transition: all 0.3s ease;
	outline: none;
}

/* 移动端隐藏全屏按钮 */
@media (max-width: 768px) {
	.fullscreen-toggle {
		display: none;
	}
}

.fullscreen-toggle:hover {
	transform: scale(1.1);
	box-shadow: 0 6px 16px var(--card-shadow-drag);
}

.fullscreen-toggle:active {
	transform: scale(0.95);
}

.fullscreen-toggle:focus-visible {
	box-shadow: 0 0 0 3px var(--control-focus);
}

.fullscreen-toggle-icon {
	font-size: 22px;
	line-height: 1;
	transition: transform 0.3s ease;
}

.fullscreen-toggle:hover .fullscreen-toggle-icon {
	transform: scale(1.15);
}

@media (max-width: 768px) {
	.theme-toggle {
		width: 40px;
		height: 40px;
		top: 16px;
		right: 16px;
	}

	.theme-toggle-icon {
		font-size: 20px;
	}

	.music-toggle {
		width: 40px;
		height: 40px;
		top: 16px;
		right: 16px;
	}

	.music-toggle-icon {
		font-size: 20px;
	}
}

/* 引导页样式 */
.welcome-page {
	position: fixed;
	top: 0;
	left: 0;
	width: 100vw;
	height: 100vh;
	background-color: var(--bg-base-color);
	background-image: linear-gradient(0deg, var(--bg-grid-color) 1px, transparent 0),
		linear-gradient(90deg, var(--bg-grid-color) 1px, transparent 0);
	background-size: 30px 30px;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 10001;
	transition: opacity 0.6s ease, visibility 0.6s ease;
}

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

.welcome-content {
	text-align: center;
	animation: welcomeFadeIn 1s ease-out;
	transition: opacity 0.3s ease, visibility 0.3s ease;
	/* 向上偏移，使标题和按钮整体居中 */
	transform: translateY(-30px);
}

.welcome-content.hidden {
	opacity: 0;
	visibility: hidden;
}

@keyframes welcomeFadeIn {
	from {
		opacity: 0;
		transform: translateY(0px);
	}
	to {
		opacity: 1;
		transform: translateY(-30px);
	}
}

.welcome-title {
	font-size: 64px;
	font-weight: 700;
	color: var(--text-primary);
	margin-bottom: 48px;
	letter-spacing: -0.02em;
}

.welcome-enter {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-size: 18px;
	font-weight: 500;
	color: var(--text-secondary);
	cursor: pointer;
	transition: all 0.3s ease;
	user-select: none;
}

.enter-arrow {
	font-size: 24px;
	transition: transform 0.3s ease;
	display: inline-block;
}

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

.welcome-enter:hover .enter-arrow {
	transform: translateX(6px);
}

.welcome-enter:active {
	transform: scale(0.95);
}

.welcome-enter.loading {
	pointer-events: none;
	opacity: 0.5;
}

/* 加载覆盖层 */
.loading-overlay {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: transparent;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.4s ease, visibility 0.4s ease;
	pointer-events: none;
}

.loading-overlay.visible {
	opacity: 1;
	visibility: visible;
	pointer-events: auto;
}

/* 加载动画 - 三个点样式 */
.loading-spinner {
	display: flex;
	align-items: center;
	gap: 8px;
}

.loading-spinner::before,
.loading-spinner::after,
.loading-dot {
	content: '';
	width: 8px;
	height: 8px;
	border-radius: 50%;
	background: var(--text-primary);
	animation: dotPulse 1.4s ease-in-out infinite;
}

.loading-spinner::before {
	animation-delay: 0s;
}

.loading-dot {
	animation-delay: 0.35s;
}

.loading-spinner::after {
	animation-delay: 0.7s;
}

@keyframes dotPulse {
	0%, 100% {
		opacity: 0.3;
		transform: scale(0.8);
	}
	50% {
		opacity: 1;
		transform: scale(1);
	}
}

@keyframes spin {
	to {
		transform: rotate(360deg);
	}
}

.loading-text {
	margin-top: 20px;
	font-size: 14px;
	color: var(--text-tertiary);
	font-weight: 400;
	letter-spacing: 0.05em;
}

/* 引导页底部信息 */
.welcome-footer {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	padding: 12px 20px;
	text-align: center;
	font-size: 13px;
	color: var(--text-muted);
	background: transparent;
	z-index: 10;
}

.welcome-footer .footer-line {
	margin: 4px 0;
}

.welcome-footer a {
	color: var(--text-link);
	text-decoration: none;
	font-weight: 600;
	transition: color 0.2s ease;
	display: inline-flex;
	align-items: center;
}

.welcome-footer a:hover {
	color: var(--text-link-hover);
}

/* 主应用容器 */
.main-app {
	width: 100vw;
	height: 100vh;
	opacity: 0;
	transition: opacity 0.6s ease;
}

.main-app.visible {
	opacity: 1;
}

/* 移动端适配 */
@media (max-width: 768px) {
	.welcome-title {
		font-size: 48px;
		margin-bottom: 36px;
	}

	.welcome-enter {
		font-size: 16px;
	}

	.enter-arrow {
		font-size: 20px;
	}

	.loading-spinner::before,
	.loading-spinner::after,
	.loading-dot {
		width: 6px;
		height: 6px;
	}

	.loading-text {
		font-size: 12px;
		margin-top: 16px;
	}
}

/* 粒子光环效果的canvas容器 */
.particle-canvas {
	position: fixed;
	top: 0;
	left: 0;
	width: 100vw;
	height: 100vh;
	pointer-events: none;
	z-index: 1000;
}

/* 遵循系统"减少动态效果"偏好 */
@media (prefers-reduced-motion: reduce) {
	* {
		scroll-behavior: auto !important;
	}

	.card,
	.card *,
	.window-controls .control::after,
	.welcome-content,
	.loading-spinner::before,
	.loading-spinner::after {
		transition: none !important;
		animation: none !important;
	}
}