/* 全局变量 - 深色背景 + 浅紫色辅助 */
:root {
    --bg-primary: #121212;
    --bg-secondary: #1a1a2e;
    --bg-card: #1e1e3f;
    --bg-hover: #252547;
    --text-primary: #ffffff;
    --text-secondary: #b3b3cc;
    --text-light: #8888aa;
    --accent-primary: #c084fc;
    --accent-secondary: #a855f7;
    --accent-light: #d8b4fe;
    --border-radius: 12px;
    --shadow-sm: 0 2px 6px rgba(192, 132, 252, 0.15);
    --shadow-md: 0 4px 12px rgba(192, 132, 252, 0.2);
    --shadow-lg: 0 8px 24px rgba(168, 85, 247, 0.25);
    --transition: all 0.3s ease;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    background: rgba(18, 18, 34, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    padding: 16px 0;
}

.navbar .container {
    max-width: none;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-image {
    width: 56px;
    height: 56px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.brand {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 20px;
}

.nav-item {
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.desktop-nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 24px;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 16px;
	height:48px;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
	font-size:20px;
	padding:12px 40px;
	height: auto;
	border-radius: 30px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--accent-primary);
	font-size:20px;
	padding:12px 40px;
	height: auto;
	border-radius: 30px;
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--accent-light);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端折叠菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-secondary);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
    z-index: 1000;
    padding: 80px 20px 20px;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: space-between;
}

.mobile-nav-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.mobile-nav-menu .nav-item {
    width: 100%;
}

.mobile-nav-menu .nav-link {
    display: block;
    width: 100%;
    padding: 12px 16px;
}

.mobile-menu-actions .nav-btn {
    width: 100%;
    justify-content: center;
    margin-bottom: 8px;
}

.mobile-menu-actions .language-selector {
    width: 100%;
}

.mobile-menu-actions .lang-btn {
    width: 100%;
    justify-content: center;
	background: rgba(96,114,216,.2);
	border-radius: 30px;
}

/* 语言选择器 */
.language-selector {
    position: relative;
}

.globe-icon {
	width:18px;
	height:18px;
}

.globe-icon img {
	width:100%;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding:0px 12px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 16px;
	height:50px;
}

.lang-btn:hover {
    background: var(--bg-hover);
}

.arrow {
    transition: var(--transition);
	width: 10px;  
    height: 10px;  
    border-style: solid;  
    border-width: 1px 1px 0 0;  
    border-color: #8FBFF0;  
    -webkit-transform-origin: 75% 25%;  
    -webkit-transform: rotateZ(45deg);  
    -webkit-transition: 100ms ease-in .1s;  
    transition: 100ms ease-in .1s;
	margin-top:8px;
}

.language-selector.active .arrow {
    transform: rotate(135deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    max-height: 300px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

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

.lang-dropdown a {
    display: block;
    padding: 12px 20px;
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
    color: var(--text-primary);
    background: var(--bg-hover);
}

/* 英雄区域 */
.hero {
    padding: 180px 0 110px;
    background:#15151F;
}

.hero .container {
	padding:0;
}

.hero-content {
    display: flex;
    gap: 30px;
    align-items: center;
}

.hero-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
	max-width: 540px;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.hero-title .brand {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
}

.hero-title .subtitle {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-secondary);
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-features {
    display: flex;
    gap: 24px;
    margin-top: 16px;
    justify-content: center;
}

.feature-item {
    display: flex;
	flex:1;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px 0;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.feature-text {
    font-size: 16px;
    font-weight: 500;
    text-align: center;
}

.hero-image img {
    width: 100%;
}

.hero-visual {
	flex:1;
}

/* 功能特性 */
.features {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
	display: flex;
	align-items: center;
	flex-direction: column;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    background: var(--bg-hover);
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
	margin-bottom: 20px;
}

.feature-icon img {
	width:100%;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
}

.feature-description {
    color: var(--text-secondary);
    font-size: 16px;
	line-height: 1.8;
}

/* 支持格式 */
.formats {
    padding: 80px 0;
    background: var(--bg-primary);
}

.format-tabs {
    background: linear-gradient(135deg, rgba(30, 30, 63, 0.9), rgba(26, 26, 46, 0.95));
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid rgba(192, 132, 252, 0.2);
}

.tab-buttons {
    display: flex;
    background: linear-gradient(90deg, rgba(18, 18, 34, 1), rgba(26, 26, 46, 1));
    border-bottom: 2px solid rgba(192, 132, 252, 0.3);
    gap: 4px;
    padding: 12px;
}

.tab-btn {
    flex: 1;
    padding: 20px 24px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: normal;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

.tab-btn:hover::before {
    width: 200%;
    height: 200%;
}

.tab-btn:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

.tab-btn.active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    box-shadow: 0 4px 15px rgba(192, 132, 252, 0.4);
    transform: translateY(-2px);
	font-weight: bold;
}

.tab-content {
    padding: 40px;
    min-height: 300px;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-pane.active {
    display: block;
}

.tab-pane h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--text-primary);
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(192, 132, 252, 0.3);
    position: relative;
}

.tab-pane h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-light));
}

/* 格式卡片网格 - 上下结构 */
.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.format-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 35px 16px;
    background: linear-gradient(135deg, rgba(37, 37, 71, 0.8), rgba(30, 30, 63, 0.9));
    border-radius: 12px;
    border: 1px solid rgba(192, 132, 252, 0.15);
    transition: all 0.3s ease;
    text-align: center;
    min-height: 120px;
}

.format-card:hover {
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.2), rgba(168, 85, 247, 0.15));
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(192, 132, 252, 0.3);
    border-color: var(--accent-primary);
}

.format-card .format-icon {
    margin-bottom: 20px;
    display:flex;
	justify-content: center;
	align-items: center;
    transform: none;
	gap:20px;
}

.format-card .format-icon i {
	width:56px;
	height:56px;
	display: block;
}
.format-card .format-icon i img {
	width:100%;
}
.format-card .format-icon .arrow {
	width:18px;
	height:18px;
}

.format-card:hover .format-icon {
    transform: scale(1.1);
}

.format-card .format-name {
    font-size: 17px;
    font-weight: normal;
    color: var(--text-primary);
}

/* 旧版格式列表兼容 */
.format-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    list-style: none;
}

.format-list li {
    padding: 16px 20px 16px 44px;
    background: linear-gradient(135deg, rgba(37, 37, 71, 0.8), rgba(30, 30, 63, 0.9));
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid rgba(192, 132, 252, 0.15);
    position: relative;
}

.format-list li:hover {
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.2), rgba(168, 85, 247, 0.15));
    transform: translateX(8px) translateY(-2px);
    box-shadow: 0 6px 20px rgba(192, 132, 252, 0.3);
    border-color: var(--accent-primary);
}

.format-list li:hover .format-icon {
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

/* 软件介绍 */
.intro {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.intro-content {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.intro-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.intro-row.reverse {
    direction: rtl;
}

.intro-row.reverse > * {
    direction: ltr;
}

.intro-text {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.intro-subtitle {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.intro-text .btn {
    margin-top: 16px;
    align-self: flex-start;
}

/* 视频格式圆形展示 */
.video-formats-circle {
    position: relative;
    width: 480px;
    height: 480px;
    margin: 0 auto;
}

.center-player {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 280px;
    height: 280px;
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 50%;
    border: 2px solid rgba(192, 132, 252, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.player-icon {
    display: flex;
    align-items: center;
    justify-content: center;
	width:120px;
	height:120px;
}
.player-icon img {
	width:100%;
}

.progress-bar {
    width: 120px;
    height: 5px;
    background: rgba(192, 132, 252, 0.2);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

.format-badge {
    position: absolute;
    padding: 8px 26px;
    background: var(--bg-card);
    border-radius: 30px;
    font-size: 17px;
    font-weight: 600;
    color: var(--accent-primary);
    border: 1px solid rgba(192, 132, 252, 0.3);
    box-shadow: var(--shadow-sm);
}

.badge-mp4 { top: 10%; left: 50%; transform: translateX(-50%); }
.badge-avi { top: 30%; right: 5%; }
.badge-4k { top: 30%; left: 5%; }
.badge-hd { bottom: 30%; left: 5%; }
.badge-mkv { bottom: 30%; right: 5%; }
.badge-flv { bottom: 10%; left: 50%; transform: translateX(-50%); }

/* 功能图标网格 */
.feature-icons-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 0 auto;
}

.feature-icon-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding:36px 20px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid rgba(192, 132, 252, 0.15);
    transition: var(--transition);
}

.feature-icon-item img {
	width:56px;
}

.feature-icon-item:hover {
    background: var(--bg-hover);
    transform: translateY(-3px);
    border-color: var(--accent-primary);
}

/* 多种实用功能 */
.more-features {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.more-features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.more-feature-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
	padding-bottom: 15px;
}

.more-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.more-feature-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
	margin-bottom: 10px;
}

.more-feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.more-feature-card:hover .more-feature-image img {
    transform: scale(1.05);
}

.more-feature-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    padding: 20px 20px 12px;
    margin: 0;
}

.more-feature-desc {
    font-size: 16px;
    color: var(--text-secondary);
    padding: 0 20px;
    line-height: 28px;
    margin-bottom: 20px;
    height: 112px;
}


/* 下载 */
.download {
    padding: 80px 0;
    background: var(--bg-primary);
}

.download-content {
    display: flex;
    gap: 50px;
    align-items: center;
}

.download-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
	width:500px;
}

.download-title-large {
    font-size: 42px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.download-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin: 0;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 30px;
    background: var(--bg-card);
    border: 2px solid var(--accent-primary);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    transition: var(--transition);
    width: 300px;
}

.download-btn:hover {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.download-btn img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.download-version-text {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
}

.download-right {
    display: flex;
    align-items: center;
    justify-content: center;
	flex:1;
}

.download-right img {
    width: 100%;
    height: auto;
}

/* 用户评价 */
.reviews {
    padding: 80px 0;
    background: var(--bg-primary);
}

.reviews-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.review-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    background: var(--bg-hover);
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.reviewer-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.reviewer-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.reviewer-details {
    flex: 1;
}

.reviewer-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.review-rating {
    display: flex;
    gap: 4px;
}

.star {
    color: var(--accent-primary);
    font-size: 14px;
}

.review-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: var(--bg-secondary);
    padding: 60px 0 30px;
    border-top: 1px solid var(--bg-hover);
}

/* 语言选择区域 */
.footer-language-section {
    margin-bottom: 40px;
    text-align: center;
}

.language-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.language-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    max-width: 800px;
    margin: 0 auto;
}

.language-btn {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--bg-hover);
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    min-width: 100px;
    text-align: center;
}

.language-btn:hover {
    background: rgba(192, 132, 252, 0.2);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.language-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

/* 语言展开/收起按钮 */
.lang-toggle-btn {
    display: none;
    margin: 20px auto 0;
    padding: 10px 24px;
    background: transparent;
    border: 1px solid var(--accent-primary);
    border-radius: 20px;
    color: var(--accent-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.lang-toggle-btn:hover {
    background: var(--accent-primary);
    color: white;
}

/* 移动端隐藏多余语言 */
@media (max-width: 768px) {
    .language-buttons {
        max-height: 110px;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .language-buttons.expanded {
        max-height: 500px;
    }
    
    .language-buttons .hidden-lang {
        opacity: 0;
        transform: translateY(-10px);
        transition: opacity 0.3s ease, transform 0.3s ease;
    }
    
    .language-buttons.expanded .hidden-lang {
        opacity: 1;
        transform: translateY(0);
    }
    
    .lang-toggle-btn {
        display: block;
    }
}

/* 主要内容区域 */
.footer-main {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
    gap: 60px;
}

.footer-developer {
    flex: 1;
    max-width: 400px;
}

.developer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.logo-icon {
    margin-right: 12px;
	width:56px;
	height:56px;
}

.logo-icon img {
	width:100%;
}

.developer-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.developer-desc {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.footer-links-container {
    display: flex;
    gap: 60px;
}

.footer-links-group {
    min-width: 120px;
}

.links-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.links-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.links-list li {
    margin-bottom: 12px;
}

.link-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.link-item:hover {
    color: var(--accent-primary);
}

/* 语言版块 */
.languages-section {
    padding: 80px 0;
    background: var(--bg-primary);
}

.languages-grid-large {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
}

.language-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px 16px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid rgba(192, 132, 252, 0.15);
    text-decoration: none;
    transition: var(--transition);
    text-align: center;
}

.language-card:hover {
    background: var(--bg-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.language-card.active {
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.2), rgba(168, 85, 247, 0.15));
    border-color: var(--accent-primary);
}

.lang-flag {
    font-size: 32px;
    margin-bottom: 8px;
}

.lang-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

/* 旧版语言网格兼容 */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.language-item {
    padding: 8px 12px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    text-align: center;
    transition: var(--transition);
}

.language-item:hover,
.language-item.active {
    color: var(--text-primary);
    background: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--bg-hover);
    padding-top: 30px;
    text-align: center;
}

.footer-copyright {
    color: var(--text-light);
    font-size: 14px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-primary);
    border: none;
    box-shadow: 0 4px 20px rgba(192, 132, 252, 0.4);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
    transform: scale(0.8);
}

.back-to-top img {
	width:70%;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.back-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 30px rgba(192, 132, 252, 0.5);
}

.back-to-top svg {
    width: 28px;
    height: 28px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .nav-menu {
        display: none;
    }
    
    .desktop-nav-right {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title .brand {
        font-size: 42px;
    }
    
    .hero-title .subtitle {
        font-size: 24px;
    }
    
    .hero-features {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .formats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .more-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-left {
        align-items: center;
    }
    
    .download-title-large {
        font-size: 36px;
    }
    
    .reviews-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    
    .languages-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .intro-row {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .intro-row.reverse {
        direction: ltr;
    }
    
    .video-formats-circle {
        width: 300px;
        height: 300px;
    }
    
    .feature-icons-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
}

@media (max-width: 768px) {
	.navbar .container {
		padding:0 20px;
		box-sizing: border-box;
	}
	.hero-features {
		display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
	}
	
	.footer-links-group {
		display:none;
	}
    .hero {
        padding: 140px 0 40px;
    }
	.hero .container {
		padding:0 20px;
	}
	.hero-content {
		display:flex;
		flex-direction: column;
	}
    
    .hero-title .brand {
        font-size: 36px;
    }
    
    .hero-title .subtitle {
        font-size: 20px;
    }
    
    .hero-buttons {
        flex-direction: row;
        align-items: center;
		justify-content: center;
    }
	
	.tab-buttons {
		display: flex;
    flex-wrap: wrap;
    justify-content: center; 
    align-items: center;
    gap: 0px;  
    width: 100%;
	}
	
	.tab-btn {
		min-width:100px;
		font-size:18px;
		padding:18px 0px;
	}
	.tab-content {
		padding:20px 10px;
	}
    .section-title {
        font-size: 30px;
    }
	.intro-content {
		gap:40px;
	}
	.intro-row {
		border-bottom:1px solid rgba(255,255,255,.1);
		padding-bottom:30px;
		gap:20px;
	}
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reviews-container {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .languages-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .format-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .languages-grid-large {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .intro-subtitle {
        font-size: 24px;
    }
	.more-features {
		padding-top:0;
	}
	.more-feature-card {
		padding-bottom:0;
	}
	.more-feature-desc {
		margin-bottom:10px;
	}
    
    .more-features-grid {
        grid-template-columns: 1fr;
    }
    
	.download {
		padding:50px 0;
	}
	
    .download-title-large {
        font-size: 28px;
    }
	
	.download-content {
		display:flex;
		flex-direction: column;
	}
    
	.download-left {
		width:auto;
		max-width: 100%;
	}
	.footer-main {
		display:flex;
		flex-direction: column;
		gap:0;
		margin-bottom: 20px;
	}
	.features {
		padding:40px 0 60px 0;
	}
}

@media (max-width: 480px) {
    .hero-title .brand {
        font-size: 28px;
    }
    
    .hero-title .subtitle {
        font-size: 18px;
    }
    
    .feature-item {
        padding: 20px 12px;
		gap:8px;
    }
    
    .feature-icon {
        width:48px;
		height:48px;
		margin-bottom: 0;
    }
    
    .formats-grid {
        grid-template-columns: 1fr;
    }
    
    .languages-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .format-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .format-card {
        padding: 16px 12px;
        min-height: 100px;
    }
    
    .format-card .format-icon i {
        width: 36px;
		height:36px;
    }
	.format-card .format-icon .arrow {
		width:10px;
		height:10px;
	}
    
    .format-card .format-name {
        font-size: 16px;
    }
    
    .languages-grid-large {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .language-card {
        padding: 16px 12px;
    }
    
    .lang-flag {
        font-size: 24px;
    }
    
    .lang-name {
        font-size: 12px;
    }
    
    .center-player {
        width: 100%;
        height: 100%;
    }
    
    .feature-icons-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }
    
    .feature-icon-item {
        padding: 12px;
    }
    
    .feature-icon-item svg {
        width: 32px;
        height: 32px;
    }
    
    .back-to-top {
        width: 48px;
        height: 48px;
        bottom: 24px;
        right: 24px;
    }
    
    .back-to-top svg {
        width: 24px;
        height: 24px;
    }
}