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

:root {
	--bg-body: #f5f7fc;
	--card-bg: #ffffff;
	--text-primary: #1e293b;
	--text-secondary: #6c7a91;
	--border-light: #eef2f8;
	--border-input: #cbd5e1;
	--nav-bg: #ffffff;
	--nav-border: #e9edf2;
	--nav-item-hover: #f0f4fa;
	--nav-item-active: #eef2ff;
	--btn-primary: #1e4a8a;
	--btn-primary-hover: #0f3a6f;
	--btn-secondary-bg: #eef2ff;
	--btn-secondary-color: #1e4a8a;
	--info-bg: #f8fafc;
	--icon-color: #4b6a9b;
	--shadow-sm: 0 1px 2px rgba(0,0,0,0.02);
	--shadow-md: 0 8px 24px rgba(0,0,0,0.03), 0 1px 2px rgba(0,0,0,0.05);
	--toast-bg: #1f2a44;
	--toast-color: #eef2ff;
}

body.dark {
	--bg-body: #0f172a;
	--card-bg: #1e293b;
	--text-primary: #e2e8f0;
	--text-secondary: #94a3b8;
	--border-light: #334155;
	--border-input: #475569;
	--nav-bg: #0f172a;
	--nav-border: #1e293b;
	--nav-item-hover: #334155;
	--nav-item-active: #1e293b;
	--btn-primary: #3b82f6;
	--btn-primary-hover: #2563eb;
	--btn-secondary-bg: #334155;
	--btn-secondary-color: #cbd5e1;
	--info-bg: #0f172a;
	--icon-color: #94a3b8;
	--shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
	--shadow-md: 0 8px 24px rgba(0,0,0,0.2);
	--toast-bg: #1e293b;
	--toast-color: #e2e8f0;
}

body {
	font-family: 'Inter', sans-serif;
	background: var(--bg-body);
	color: var(--text-primary);
	line-height: 1.5;
	transition: background 0.2s ease, color 0.2s ease;
}

.app-container {
	width: 100%;
	background: var(--bg-body);
}

/* 顶部导航 */
.top-bar {
	width: 100%;
	background: var(--nav-bg);
	border-bottom: 1px solid var(--nav-border);
	position: sticky;
	top: 0;
	z-index: 100;
	box-shadow: var(--shadow-sm);
	transition: background 0.2s ease;
}

.nav-container {
	max-width: 1420px;
	margin: 0 auto;
	padding: 0 24px;
	display: flex;
	flex-wrap: nowrap;
	align-items: stretch;
	justify-content: space-between;
}

.mobile-menu-toggle {
	display: none;
}

.nav-menu {
	display: flex;
	flex-wrap: nowrap;
	align-items: stretch;
	align-self: stretch;
	column-gap: 0;
	row-gap: 0;
	padding: 0;
	min-width: 0;
}

.nav-item {
	display: flex;
	align-items: center;
	align-self: stretch;
	gap: 12px;
	padding: 0 20px;
	min-height: 72px;
	transition: background 0.22s ease, color 0.22s ease;
	text-decoration: none;
	color: var(--text-primary);
	font-weight: 500;
	cursor: pointer;
	position: relative;
	overflow: hidden;
	border: 0 !important;
	border-radius: 0;
	box-shadow: none;
	white-space: nowrap;
}

.nav-item:hover::after{
	content: '';
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 2px;
	background: #2563eb;
	opacity: 1;
	z-index: 2;
	pointer-events: none;
	transition: opacity 0.22s ease;
}

.nav-item i {
	font-size: 1.08rem;
	width: 34px;
	height: 34px;
	border-radius: 14px;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	color: #2563eb;
	background: linear-gradient(135deg, #eff6ff, #dbeafe);
	box-shadow: none;
	transition: color 0.22s ease, background 0.22s ease, transform 0.22s ease;
	position: relative;
	z-index: 1;
	flex: 0 0 34px;
}

.nav-item-text {
	display: flex;
	flex-direction: column;
	line-height: 1.2;
	position: relative;
	z-index: 1;
	min-width: 0;
}

.nav-item-en {
	font-size: 0.9rem;
	font-weight: 700;
	letter-spacing: 0.2px;
	color: var(--text-primary);
	transition: color 0.22s ease;
}

.nav-item-cn {
	font-size: 0.85rem;
	color: var(--text-secondary);
	transition: color 0.22s ease;
}

.nav-item:hover,
.nav-item.active,
.nav-item.active:hover {
	background: #f8fafc;
	box-shadow: none;
	transform: none;
}

.nav-item:hover i,
.nav-item.active i,
.nav-item.active:hover i {
	color: #ffffff;
	background: linear-gradient(135deg, #2563eb, #1e4a8a);
	transform: scale(0.9);
	box-shadow: none;
}

.nav-item:hover .nav-item-en,
.nav-item.active .nav-item-en,
.nav-item.active:hover .nav-item-en {
	color: #1d4ed8;
}

.nav-item:hover .nav-item-cn,
.nav-item.active .nav-item-cn,
.nav-item.active:hover .nav-item-cn {
	color: #3b82f6;
}

.nav-item:active {
	transform: none;
	box-shadow: none;
}

.nav-item:focus-visible {
	outline: 2px solid rgba(37, 99, 235, 0.48);
	outline-offset: 3px;
}

body.dark .nav-item i {
	color: #93c5fd;
	background: rgba(96, 165, 250, 0.12);
	box-shadow: none;
}

body.dark .nav-item:hover,
body.dark .nav-item.active,
body.dark .nav-item.active:hover {
	background: #1e293b;
	box-shadow: none;
}

body.dark .nav-item:hover::after,
body.dark .nav-item.active::after {
	background: #60a5fa;
}

body.dark .nav-item:hover i,
body.dark .nav-item.active i,
body.dark .nav-item.active:hover i {
	color: #0f172a;
	background: linear-gradient(135deg, #93c5fd, #60a5fa);
	transform: scale(0.9);
	box-shadow: none;
}

body.dark .nav-item:hover .nav-item-en,
body.dark .nav-item.active .nav-item-en,
body.dark .nav-item.active:hover .nav-item-en {
	color: #60a5fa;
}

body.dark .nav-item:hover .nav-item-cn,
body.dark .nav-item.active .nav-item-cn,
body.dark .nav-item.active:hover .nav-item-cn {
	color: #93c5fd;
}

.nav-right {
	display: flex;
	align-items: center;
	gap: 12px;
	flex-shrink: 0;
}

.nav-right a{
    text-decoration: none;
}

.theme-toggle,
.lang-toggle {
	background: var(--btn-secondary-bg);
	border-radius: 40px;
	padding: 8px 18px;
	font-size: 0.8rem;
	cursor: pointer;
	color: var(--btn-secondary-color);
	display: flex;
	align-items: center;
	gap: 8px;
	transition: all 0.2s;
	border: none;
	font-weight: 500;
	white-space: nowrap;
}

.theme-toggle:hover,
.lang-toggle:hover {
	transform: translateY(-1px);
	opacity: 0.9;
}

.main-content {
	max-width: 1420px;
	margin: 32px auto;
	padding: 0 24px;
}

.twofa-card {
	background: var(--card-bg);
	border-radius: 28px;
	padding: 32px 36px;
	box-shadow: var(--shadow-md);
	border: 1px solid var(--border-light);
	transition: background 0.2s ease, border 0.2s ease;
}

.form-group {
	margin-bottom: 24px;
}

.form-group label {
	font-weight: 600;
	font-size: 0.95rem;
	display: block;
	margin-bottom: 10px;
	color: var(--text-primary);
}

.form-group label i {
	color: #2563eb;
	margin-right: 6px;
}

body.dark .form-group label i {
	color: #60a5fa;
}

.form-control {
	width: 100%;
	padding: 14px 18px;
	font-family: 'Monaco', 'Menlo', 'Cascadia Code', monospace;
	font-size: 0.9rem;
	border: 1px solid var(--border-input);
	border-radius: 20px;
	background: var(--card-bg);
	color: var(--text-primary);
	transition: 0.2s;
	resize: vertical;
}

.form-control:focus {
	outline: none;
	border-color: #3b82f6;
	box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.form-control::placeholder {
	color: var(--text-secondary);
	opacity: 0.6;
}

textarea.form-control {
	font-family: monospace;
	line-height: 1.4;
}

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	background: var(--btn-primary);
	border: none;
	padding: 12px 32px;
	border-radius: 40px;
	font-weight: 600;
	color: white;
	cursor: pointer;
	transition: 0.2s;
	font-size: 0.9rem;
	text-decoration: none;
}

.btn-primary {
	background: var(--btn-primary);
}

.btn-primary:hover {
	background: var(--btn-primary-hover);
	transform: translateY(-1px);
}

.btn-secondary {
	background: var(--btn-secondary-bg);
	color: var(--btn-secondary-color);
	margin-left: 12px;
}

.btn-secondary:hover {
	background: var(--border-input);
	transform: translateY(-1px);
}

.copy-area {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 12px;
	margin-top: 8px;
}

#copyStatus {
	font-size: 0.8rem;
	color: #10b981;
	font-weight: 500;
}

.footer-note {
	margin-top: 28px;
	padding-top: 20px;
	border-top: 1px solid var(--border-light);
	font-size: 0.75rem;
	color: var(--text-secondary);
	text-align: center;
}

.info-text {
	background: var(--info-bg);
	border-radius: 18px;
	padding: 14px 20px;
	margin-top: 20px;
	font-size: 0.75rem;
	color: var(--text-secondary);
	border: 1px solid var(--border-light);
}

/* 中等屏幕*/
@media (max-width: 1180px) {
	.nav-container {
		padding: 0 16px;
	}

	.nav-item {
		padding: 0 10px;
		gap: 8px;
	}

	.nav-item i {
		width: 30px;
		height: 30px;
		font-size: 0.95rem;
		flex-basis: 30px;
	}

	.nav-item-en {
		font-size: 0.8rem;
	}

	.nav-item-cn {
		font-size: 0.74rem;
	}

	.theme-toggle,
	.lang-toggle {
		padding: 7px 12px;
	}
}

/* 平板偏窄*/
@media (min-width: 769px) and (max-width: 960px) {
	.nav-item {
		padding: 0 9px;
	}

	.nav-item-cn {
		display: none;
	}

	.nav-item-en {
		font-size: 0.78rem;
	}

	.nav-right {
		gap: 8px;
	}

	.lang-toggle span {
		display: none;
	}
}

/* 手机端：折叠菜单 */
@media (max-width: 768px) {
	.top-bar {
		position: sticky;
		top: 0;
	}

	.nav-container {
		display: flex;
		flex-wrap: wrap;
		align-items: center;
		justify-content: space-between;
		padding: 10px 14px;
	}

	.mobile-menu-toggle {
		display: inline-flex;
		align-items: center;
		justify-content: center;
		width: 42px;
		height: 42px;
		border: none;
		border-radius: 14px;
		background: var(--btn-secondary-bg);
		color: var(--btn-secondary-color);
		cursor: pointer;
		font-size: 1rem;
		order: 1;
	}

	.nav-right {
		order: 2;
		margin-left: auto;
		display: flex;
		align-items: center;
		justify-content: flex-end;
		gap: 8px;
		padding-bottom: 0;
	}

	.theme-toggle,
	.lang-toggle {
		height: 38px;
		padding: 0 12px;
		font-size: 0.78rem;
		white-space: nowrap;
	}

	.nav-menu {
		order: 3;
		width: 100%;
		display: none;
		flex-direction: column;
		align-items: stretch;
		margin-top: 10px;
		padding: 8px;
		border-radius: 18px;
		background: var(--card-bg);
		border: 1px solid var(--border-light);
		box-shadow: var(--shadow-md);
	}

	.nav-menu.open {
		display: flex;
	}

	.nav-item {
		width: 100%;
		min-height: 54px;
		padding: 10px 14px;
		border-radius: 14px;
		align-self: auto;
		gap: 12px;
	}

	.nav-item::after {
		display: none;
	}

	.nav-item i {
		width: 34px;
		height: 34px;
		flex: 0 0 34px;
		border-radius: 12px;
	}

	.nav-item-en {
		font-size: 0.9rem;
		white-space: nowrap;
	}

	.nav-item-cn {
		display: block;
		font-size: 0.78rem;
		white-space: nowrap;
	}

	.main-content {
		margin: 18px auto;
		padding: 0 14px;
	}

	.twofa-card {
		padding: 22px 16px;
		border-radius: 22px;
	}

	.form-control {
		padding: 13px 14px;
		border-radius: 16px;
		font-size: 0.86rem;
	}

	.btn {
		width: 100%;
		justify-content: center;
	}

	.btn-secondary {
		margin-left: 0;
		margin-top: 10px;
	}

	.copy-area {
		align-items: stretch;
	}

	#copyStatus {
		text-align: center;
	}
}

/* 极窄屏 */
@media (max-width: 380px) {
	.nav-container {
		padding: 8px 10px;
	}

	.mobile-menu-toggle,
	.theme-toggle,
	.lang-toggle {
		height: 38px;
	}

	.mobile-menu-toggle {
		width: 38px;
	}

	.lang-toggle span {
		display: none;
	}

	.theme-toggle,
	.lang-toggle {
		padding: 0 11px;
	}

	.nav-item {
		min-height: 50px;
		padding: 9px 12px;
	}

	.twofa-card {
		padding: 20px 14px;
	}
}