.copyright a{
	color: #999;
}
 /* 基础样式与重置 */
 :root {
 	--primary-color: #ff0000;
 	/* YouTube主题红 */
 	--primary-dark: #cc0000;
 	--text-color: #333333;
 	--text-light: #666666;
 	--background-color: #ffffff;
 	--background-light: #f9f9f9;
 	--border-color: #e0e0e0;
 	--shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
 	--radius: 8px;
 }

 * {
 	margin: 0;
 	padding: 0;
 	box-sizing: border-box;
 	font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
 }

 body {
 	background-color: var(--background-color);
 	color: var(--text-color);
 	line-height: 1.6;
 }

 .container {
 	width: 100%;
 	max-width: 1200px;
 	margin: 0 auto;
 	padding: 0 20px;
 }

 /* 顶部导航 */
 header {
 	background-color: var(--background-color);
 	box-shadow: var(--shadow);
 	position: sticky;
 	top: 0;
 	z-index: 100;
 }

 .navbar {
 	display: flex;
 	justify-content: space-between;
 	align-items: center;
 	padding: 15px 0;
 }

 .logo {
 	font-size: 1.5rem;
 	font-weight: 700;
 	color: var(--primary-color);
 	text-decoration: none;
 	display: flex;
 	align-items: center;
 }

 .logo-icon {
 	margin-right: 8px;
 	font-size: 1.8rem;
 }

 .nav-links {
 	display: flex;
 	list-style: none;
 	align-items: center;
 }

 .nav-links li {
 	margin-left: 20px;
 }

 .nav-links a {
 	text-decoration: none;
 	color: var(--text-color);
 	font-weight: 500;
 	font-size: 0.95rem;
 	transition: color 0.3s;
 }

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

 /* 多语言切换按钮 */
 .language-switcher {
 	position: relative;
 	display: inline-block;
 }

 .language-button {
 	display: flex;
 	align-items: center;
 	background: none;
 	border: 1px solid var(--border-color);
 	border-radius: var(--radius);
 	padding: 8px 12px;
 	cursor: pointer;
 	transition: all 0.3s;
 	font-size: 0.9rem;
 	color: var(--text-color);
 }

 .language-button:hover {
 	border-color: var(--primary-color);
 	background-color: var(--background-light);
 }

 .language-icon {
 	margin-right: 6px;
 	font-size: 1rem;
 }

 .language-dropdown {
 	position: absolute;
 	top: 100%;
 	right: 0;
 	background: white;
 	border-radius: var(--radius);
 	box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
 	padding: 8px 0;
 	min-width: 140px;
 	z-index: 1000;
 	opacity: 0;
 	visibility: hidden;
 	transform: translateY(-10px);
 	transition: all 0.3s;
 }

 .language-switcher.active .language-dropdown {
 	opacity: 1;
 	visibility: visible;
 	transform: translateY(0);
 }

 .language-option {
 	display: flex;
 	align-items: center;
 	padding: 10px 15px;
 	text-decoration: none;
 	color: var(--text-color);
 	transition: background-color 0.2s;
 }

 .language-option:hover {
 	background-color: var(--background-light);
 }

 .language-flag {
 	width: 20px;
 	height: 15px;
 	margin-right: 10px;
 	border-radius: 2px;
 	object-fit: cover;
 }

 .language-name {
 	font-size: 0.9rem;
 }
 
 
 /* 页脚 */
 footer {
 	background-color: var(--text-color);
 	color: white;
 	padding: 40px 0 20px;
 	text-align: center;
 }

 .footer-content {
 	display: grid;
 	grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
 	gap: 30px;
 	margin-bottom: 30px;
 	text-align: left;
 }

 .footer-column h3 {
 	margin-bottom: 20px;
 	font-size: 1.2rem;
 }

 .footer-links {
 	list-style: none;
 }

 .footer-links li {
 	margin-bottom: 10px;
 }

 .footer-links a {
 	color: #ccc;
 	text-decoration: none;
 	transition: color 0.3s;
 }

 .footer-links a:hover {
 	color: white;
 }

 .copyright {
 	padding-top: 20px;
 	border-top: 1px solid #444;
 	color: #999;
 	font-size: 0.9rem;
 }

 /* 响应式设计 */
 @media (max-width: 1200px) {
 	.instructions-grid {
 		grid-template-columns: repeat(2, 1fr);
 		gap: 30px;
 	}

 	.instruction-card {
 		padding: 35px 20px 25px;
 	}
 }

 @media (max-width: 768px) {
 	.navbar {
 		flex-direction: column;
 		padding: 15px 0;
 	}

 	.nav-links {
 		margin-top: 15px;
 		width: 100%;
 		justify-content: space-between;
 	}

 	.nav-links li {
 		margin: 0 5px;
 	}

 	.page-title {
 		font-size: 1.8rem;
 	}

 	.input-group {
 		flex-direction: column;
 	}

 	.url-input {
 		border-radius: var(--radius);
 		border-right: 1px solid var(--border-color);
 		margin-bottom: 0;
 	}

 	.fetch-btn {
 		padding: 15px;
 		border-radius: 0 0 var(--radius) var(--radius);
 		/* width: 125px; */
        margin: 5px auto;
 	}

 	.thumbnails-grid {
 		grid-template-columns: 1fr;
 	}

 	.thumbnail-actions {
 		flex-direction: column;
 		gap: 10px;
 	}

 	.preview-btn,
 	.download-btn {
 		width: 100%;
 		text-align: center;
 	}

 	.language-dropdown {
 		right: auto;
 		left: 0;
 	}

 	.instructions {
 		padding: 60px 0;
 	}

 	.instructions .section-title {
 		font-size: 1.7rem;
 		margin-bottom: 40px;
 	}

 	.instruction-card {
 		padding: 35px 25px 25px;
 	}

 	.instruction-card::before {
 		width: 35px;
 		height: 35px;
 		top: -17px;
 		font-size: 1rem;
 	}
 }

 @media (max-width: 600px) {
 	.instructions-grid {
 		grid-template-columns: 1fr;
 		gap: 40px;
 	}

 	.instruction-card {
 		padding: 35px 25px 25px;
 	}
 }

 @media (max-width: 480px) {
 	.page-title {
 		font-size: 1.6rem;
 	}

 	.page-description {
 		font-size: 1rem;
 	}

 	.instructions {
 		padding: 40px 0;
 	}

 	.instructions .section-title {
 		font-size: 1.5rem;
 	}

 	.instruction-card {
 		padding: 30px 20px 20px;
 	}

 	.instruction-icon {
 		font-size: 2.5rem;
 		height: 70px;
 		width: 70px;
 	}

 	.instruction-title {
 		font-size: 1.2rem;
 	}

 	.instruction-desc {
 		font-size: 0.9rem;
 	}

 	.nav-links {
 		flex-wrap: wrap;
 	}

 	.nav-links li {
 		margin-bottom: 10px;
 	}
 }