/* 基础样式和重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* 导航栏 */
.navbar {
    background-color: transparent;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(135, 206, 250, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #5dade2;
}

.logo i {
    margin-right: 10px;
    width: 3.0rem;
	height: 3.0rem;
}
.logo i img {
	width:100%;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
	font-size:1.1rem;
	font-weight: bold;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #5dade2;
}

.nav-primary {
    background: linear-gradient(135deg, #5dade2, #3498db);
    color: #fff!important;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
	height:3.0rem;
	padding:0 2.0rem;
	font-size:1.0rem;
}

.nav-primary:hover {
    background: linear-gradient(135deg, #3498db, #2980b9);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
    color: #fff;
}


.hero-primary {
    background: linear-gradient(135deg, #0DACFD, #6E3DF7);
    color: #fff;
    padding: 15px 20px 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
	font-size:1.2rem;
}
.hero-primary:hover {
    background: linear-gradient(135deg, #3498db, #33A2FF);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
    color: #fff;
}
.hero-primary i {
	width:2rem;
	height:2rem;
}
.hero-primary i img {
	width:100%;
}

.hero-secondary {
    background: #fff;
    color: #33A2FF;
    padding: 15px 20px 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    border: 2px solid #33A2FF;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
	font-size:1.2rem;
}

.hero-secondary:hover {
    background: #33A2FF;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
}

.btn-primary {
    background: linear-gradient(135deg, #0DACFD, #6E3DF7);
    color: #fff;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #3498db, #33A2FF);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
    color: #fff;
}

.btn-secondary {
    background: #fff;
    color: #5dade2;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    border: 2px solid #5dade2;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: #5dade2;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
}

.language-selector {
    position: relative;
}

.language-btn {
    background: #f0f8ff;
    border: 1px solid #d4e6f1;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
	height: 3.0rem;
	padding: 0 1.6rem;
	font-size:1.0rem;
}

.language-btn:hover {
    background: #d4e6f1;
}
.language-btn .fa-globe {
	width:1.2rem;
	height:1.2rem;
	background: url(../images/golab.png) no-repeat center;
	background-size:100% auto; 
}
.language-btn .fa-chevron-down {
	width: 10px;  
    height: 10px; 
	margin-top: 10px;
    border-style: solid;  
    border-width: 2px 2px 0 0;  
    border-color: #4BA3DE;  
    -webkit-transform-origin: 75% 25%;  
    -webkit-transform: rotateZ(135deg);  
    -webkit-transition: 100ms ease-in .1s;  
    transition: 100ms ease-in .1s; 
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(135, 206, 250, 0.2);
    padding: 10px 0;
    margin-top: 5px;
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1001;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(5px);
}

.language-dropdown a {
    display: block;
    padding: 10px 20px;
    text-decoration: none;
    color: #333;
    transition: background-color 0.3s ease;
}

.language-dropdown a:hover {
    background-color: #f0f8ff;
}

.mobile-menu {
    display: none;
    width: 30px;
    height: 24px;
    position: relative;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu .menu-bar {
    display: block;
    width: 100%;
    height: 3px;
    background-color: #0099FF;
    border-radius: 2px;
    position: absolute;
    left: 0;
    transition: all 0.3s ease;
}

.mobile-menu .menu-bar:nth-child(1) {
    top: 0;
}

.mobile-menu .menu-bar:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
}

.mobile-menu .menu-bar:nth-child(3) {
    bottom: 0;
}

/* 菜单展开时的叉号动画 */
.mobile-menu.active .menu-bar:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}

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

.mobile-menu.active .menu-bar:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
}

/* 英雄区域 */
.hero {
    background:url(../images/banner_bg.jpg) no-repeat center;
	background-size:cover;
    padding: 120px 0 80px;
	min-height: 80vh;
	display: flex;
}

.hero .container {
    display: flex;
    gap: 40px;
    align-items: center;
	justify-content: center;
}

.hero-content {
    text-align: left;
	display:flex;
	gap:2rem;
	flex-direction: column;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.2;
	
	background: linear-gradient(45deg, #6E3DF7 0%, #0DACFD 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #111;
	background:rgba(255,255,255,.5);
	border-radius: 20px;
	padding:1rem;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.hero-image {
	max-width:600px;
}
.hero-image img {
    width: 100%;
    transition: transform 0.3s ease;
}

.hero-image img:hover {
    transform: scale(1.02);
}

.hero-secondary .fa-online {
	width:2.0rem;
	height:2.0rem;
	background: url(../images/change.png) no-repeat center;
	background-size:100% auto; 
}
.hero-secondary:hover .fa-online {
	background: url(../images/change_w.png) no-repeat center;
	background-size:100% auto; 
}

/* 通用版块样式 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 15px;
    color: #2c3e50;
}

.section-header p {
    font-size: 1.1rem;
    color: #7f8c8d;
    max-width: 600px;
    margin: 0 auto;
}

/* 多功能转换版块 */
.features {
    padding: 100px 0;
    background: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    background: #f0f8ff;
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #d4e6f1;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(135, 206, 250, 0.2);
    border-color: #5dade2;
}

.feature-image {
    width: 120px;
    height: 120px;
    margin: 0 auto 20px;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
	background: #fff;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 15px;
}

.feature-item:hover .feature-image {
    transform: scale(1.05);
    box-shadow: 0 10px 30px rgba(93, 173, 226, 0.3);
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-item p {
    color: #7f8c8d;
    line-height: 1.6;
}

/* 产品优势版块 */
.advantages {
    padding: 100px 0;
    background: #fff;
}

.advantages-list {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.advantage-card {
    display: flex;
    align-items: center;
    gap: 60px;
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    transition: all 0.3s ease;
	justify-content: space-between;
}

.advantage-card:hover {
    transform: translateX(10px);
}

.advantage-card-reverse:hover {
    transform: translateX(-10px);
}

.advantage-image {
	flex:1;
    overflow: hidden;
}

.advantage-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.advantage-card:hover .advantage-image img {
    transform: scale(1.02);
}

.advantage-content {
	display:flex;
	flex-direction: column;
    flex: 1;
    max-width: 500px;
	gap:2rem;
}

.advantage-title {
    display: flex;
    align-items: center;
    gap: 15px;
}

.advantage-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #5dade2, #3498db);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.3rem;
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
}
.advantage-icon img {
	width:75%;
}

.advantage-content h3 {
    font-size: 1.8rem;
    margin: 0;
    color: #2c3e50;
    font-weight: 600;
}

.advantage-content p {
    color: #7f8c8d;
    line-height: 3rem;
    font-size: 1.1rem;
    margin: 0;
}

/* 在线转换功能版块 */
.online-convert {
    padding: 100px 0;
    background: #f0f8ff;
}

.online-convert-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.convert-form {
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(135, 206, 250, 0.2);
    transition: all 0.3s ease;
}

.convert-form:hover {
    box-shadow: 0 15px 35px rgba(135, 206, 250, 0.25);
}

.form-group {
    margin-bottom: 30px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
    font-size: 1.1rem;
}

.file-upload-area {
    border: 2px dashed #5dade2;
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    background: #fff;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap:2rem;
	height:280px;
	overflow: auto;
}

.file-upload-area:hover {
    border-color: #3498db;
    background-color: rgba(93, 173, 226, 0.1);
}

#file-upload {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

.upload-icon {
    color: #5dade2;
    transition: all 0.3s ease;
}

.file-upload-area:hover .upload-icon {
    transform: scale(1.1);
}
.fa-cloud-upload-alt {
	display: block;
	width:3.0rem;
	height:3.0rem;
}
.fa-cloud-upload-alt img {
	width:100%;
}

.file-list {
    margin-top: 20px;
    text-align: left;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: #f0f8ff;
    border-radius: 5px;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.file-item i {
    color: #5dade2;
    margin-right: 10px;
}

.file-item .file-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item .file-size {
    color: #7f8c8d;
    margin-left: 10px;
}

select {
    width: 100%;
    padding: 15px;
    border: 2px solid #d4e6f1;
    border-radius: 10px;
    font-size: 1rem;
    background: #f0f8ff;
    transition: all 0.3s ease;
}

select:focus {
    outline: none;
    border-color: #5dade2;
    box-shadow: 0 0 0 3px rgba(93, 173, 226, 0.1);
}

.convert-form .form_button {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
    cursor: pointer;
    border: none;
    border-radius: 50px;
    background: linear-gradient(135deg, #5dade2, #3498db);
    color: #fff;
    font-weight: 600;
    transition: all 0.3s ease;
}

.convert-form .form_button:hover {
    background: linear-gradient(135deg, #3498db, #2980b9);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
}

.conversion-result {
    margin-top: 30px;
    text-align: center;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px;
    background: #f0f8ff;
    border-radius: 10px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #5dade2;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result {
    padding: 30px;
    background: #f0f8ff;
    border-radius: 10px;
    text-align: center;
}

.result-icon {
    width: 80px;
    height: 80px;
    background: #27ae60;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #fff;
    font-size: 2rem;
}

.result h3 {
    margin-bottom: 20px;
    color: #2c3e50;
}

#download-link {
    display: inline-block;
    margin-top: 10px;
}

.convert-steps {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.step {
    display: flex;
    flex-direction: column;
    gap: 15px;
    background: #fff;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(135, 206, 250, 0.1);
    transition: all 0.3s ease;
}

.step:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 25px rgba(135, 206, 250, 0.15);
}

.step-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #5dade2, #3498db);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step h3 {
    font-size: 1.3rem;
    margin: 0;
    color: #2c3e50;
}

.step p {
    color: #7f8c8d;
    margin: 0;
    padding-left: 65px;
}

.step-arrow {
    display: flex;
    justify-content: center;
	align-items: center;
}
.step-arrow .fa-arrow-down {
	width: 30px;  
    height: 30px;  
    border-style: solid;  
    border-width: 2px 2px 0 0;  
    border-color: #0099FF;  
    -webkit-transform-origin: 75% 25%;  
    -webkit-transform: rotateZ(135deg);  
    -webkit-transition: 100ms ease-in .1s;  
    transition: 100ms ease-in .1s;
	margin-top: 10px;
}

/* 应用场景版块 */
.scenarios {
    padding: 80px 0;
    background: #fff;
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
}

.scenario-item {
    background: #fff;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    overflow: hidden;
	box-shadow: 0 10px 20px rgba(30, 30, 30, 0.1);
}

.scenario-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 20px rgba(28, 129, 196, 0.3);
}

.scenario-image {
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px 15px 0 0;
    overflow: hidden;
}

.scenario-image img {
    width: 100%;
    height: 100%;
    object-fit:cover;
}

.scenario-item h3 {
    font-size: 1.4rem;
    margin: 24px 20px 12px;
    color: #1a1a1a;
    font-weight: 600;
}

.scenario-item p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0 20px 24px;
}

@media (max-width: 1200px) {
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
}

/* 立即下载版块 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #5dade2, #3498db);
    color: #fff;
    text-align: center;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.download-content p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.download-buttons .btn-primary {
    background: #fff;
    color: #5dade2;
    font-size: 1.1rem;
    padding: 15px 30px;
    min-width: 200px;
}

.download-buttons .btn-primary:hover {
    background: #f0f8ff;
    color: #3498db;
}

.download-buttons .btn-secondary {
    background: transparent;
    color: #fff;
    border-color: #fff;
    font-size: 1.3rem;
    padding: 15px 30px;
    min-width: 200px;
	gap:2rem;
}

.download-buttons .btn-secondary:hover {
    background: #fff;
    color: #5dade2;
}

.download-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.download-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
}
.fa-windows, .fa-apple, .fa-linux {
	width:3.0rem;
	height:3.0rem;
}
.fa-windows {
	background:url(../images/windows.png) no-repeat center;
	background-size:100% auto; 
}
.fa-apple {
	background:url(../images/apple.png) no-repeat center;
	background-size:100% auto; 
}
.fa-linux {
	background:url(../images/linux.png) no-repeat center;
	background-size:100% auto; 
}
.fa-download {
	width:2.4rem;
	height:2.4rem;
	background:url(../images/down.png) no-repeat center;
	background-size:100% auto; 
}

.download-buttons .btn-secondary:hover .fa-windows {
	background:url(../images/windows_s.png) no-repeat center;
	background-size:100% auto; 
}
.download-buttons .btn-secondary:hover .fa-apple {
	background:url(../images/apple_s.png) no-repeat center;
	background-size:100% auto; 
}
.download-buttons .btn-secondary:hover .fa-linux {
	background:url(../images/linux_s.png) no-repeat center;
	background-size:100% auto; 
}
.download-buttons .btn-secondary:hover .fa-download {
	background:url(../images/down_s.png) no-repeat center;
	background-size:100% auto; 
}

/* 页脚：主区、语言区、友链、版权统一背景 #2c3440 */
.footer {
    background: #2c3440;
    color: #ecf0f1;
    padding: 80px 0 0;
}

.footer > .container {
    padding-bottom: 40px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 0;
}

.footer-brand {
    margin-bottom: 50px;
}

.footer-brand .logo {
    justify-content: center;
    margin-bottom: 15px;
    color: #ffffff;
}

.footer-brand p {
    color: #e8eaed;
    margin-bottom: 20px;
    max-width: 400px;
}

.footer-brand .social-links {
    justify-content: center;
}

.footer-languages {
    width: 100%;
    max-width: 900px;
}

.footer-languages h3 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: #5dade2;
}

.languages-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 20px;
}

.lang-item {
    background: rgba(255, 255, 255, 0.09);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: #cfd4dc;
    transition: all 0.3s ease;
}

.lang-item:hover {
    background: #5dade2;
    color: #fff;
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ecf0f1;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #5dade2;
    transform: translateY(-3px);
}

.footer-site-links {
    width: 100%;
    background: #2c3440;
    border: none;
    margin: 0;
    padding: 0;
}

.footer-site-links-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    column-gap: 36px;
    row-gap: 14px;
    padding: 18px 24px 20px;
}

.footer-site-links a {
    color: #f7f8fa;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}

.footer-site-links a:hover {
    color: #7ec8f5;
}

.footer-bottom {
    background: #2c3440;
    border-top: 1px solid rgba(0, 0, 0, 0.22);
    padding: 26px 20px 34px;
    text-align: center;
    color: #8b96a3;
    font-size: 0.85rem;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #5dade2, #3498db);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(93, 173, 226, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}
.back-to-top img {
	width:70%;
}

.back-to-top:hover {
    background: linear-gradient(135deg, #3498db, #2980b9);
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(93, 173, 226, 0.5);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1rem;
    }
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container,
    .online-convert-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .advantage-card,
    .advantage-card-reverse {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .advantage-card:hover,
    .advantage-card-reverse:hover {
        transform: translateY(-5px);
    }

    .advantage-image {
        width: 100%;
        max-width: 400px;
        height: 250px;
    }

    .advantage-title {
        justify-content: center;
    }

    .advantage-content {
        max-width: 100%;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 30px 0;
        gap: 20px;
        box-shadow: 0 10px 20px rgba(135, 206, 250, 0.2);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu {
        display: block;
    }

    .language-selector {
        margin-left: 0;
    }

    .step {
        flex-direction: column;
        text-align: center;
    }

    .step-header {
        justify-content: center;
    }

    .step p {
        padding-left: 0;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-buttons a {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 768px) {
	.container {
		padding:0 1.5rem;
	}
    .hero {
        padding: 120px 0 60px;
    }
	.hero .container {
		flex-direction:column;
		padding:0 1.5rem;
	}
    .hero-content h1 {
        font-size: 2rem;
		text-align: center;
		margin-bottom: 0;
    }
	.hero-content p {
		background:rgba(0,153,255,.1);
		margin-bottom: 0;
	}
	.hero-primary,.hero-secondary {
		justify-content:center;
	}
	.feature-image {
		width:5.6rem;
		height:5.6rem;
	}
    .section-header h2 {
        font-size: 2rem;
    }

    .features,
    .advantages,
    .online-convert,
    .scenarios,
    .download {
        padding: 3rem 0;
    }
    
	.advantages-list {
		gap:2rem;
	}
	.advantage-card {
		border-bottom:1px dotted #9FE1FF;
		padding-bottom: 2rem;
	}
	.advantage-card:last-child {
		border-bottom:none;
	}
	.advantage-icon {
		width:3.0rem;
		height:3.0rem;
	}
	.advantage-content h3 {
		font-size:1.6rem;
	}
	.advantage-content {
		gap:1rem;
	}
	.advantage-content p {
		line-height:2rem;
		font-size:1.0rem;
	}
	
    .feature-item,
    .scenario-item {
        padding: 30px;
    }

    .step {
        padding: 0.5rem;
		flex-direction: column;
    }
	.convert-steps {
		gap:0.5rem;
	}
	.step-header {
		flex-direction: column;
		position: relative;
		z-index: 1;
		padding-top:40px;
	}
	.convert-steps {
		flex-direction:row;
	}
	.step-number {
		position:absolute;
		z-index: 9;
		left: 50%;
		top: -30px;
		margin-left: -25px;
	}
	.step-arrow {
		display:none;
	}
	.step h3 {
		font-size:1.1rem;
	}
	.step p {
		font-size:0.9rem;
	}
	.scenario-item p {
		margin:0;
		font-size:1.0rem;
	}
	.download-content h2 {
		font-size:1.8rem;
	}
	.download-buttons a {
		max-width:inherit;
		justify-content: center;
	}
	.download-content p {
		font-size:1.0rem;
	}
	.footer {
		padding: 2rem 0 0;
	}
	.footer > .container {
		padding: 0 1.5rem 1.5rem;
	}
	.footer .footer-bottom .container {
		padding-left: 1.5rem;
		padding-right: 1.5rem;
	}
	.footer-brand {
		margin-bottom:1rem;
	}
	.footer-site-links-inner {
		padding: 16px 1.5rem 18px;
		column-gap: 28px;
		row-gap: 12px;
	}
	.footer-bottom {
		padding: 1rem 0 1.25rem;
	}
}

@media (max-width: 576px) {

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons a {
        width: 100%;
        max-width: 250px;
        text-align: center;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .section-header p {
        font-size: 1rem;
    }

    .languages-grid {
        gap: 10px 15px;
    }

    .lang-item {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-item,
.step,
.advantage-card,
.scenario-item {
    animation: fadeInUp 0.6s ease forwards;
}

.feature-item:nth-child(1) {
    animation-delay: 0.1s;
}

.feature-item:nth-child(2) {
    animation-delay: 0.2s;
}

.feature-item:nth-child(3) {
    animation-delay: 0.3s;
}

.feature-item:nth-child(4) {
    animation-delay: 0.4s;
}

.feature-item:nth-child(5) {
    animation-delay: 0.5s;
}

.feature-item:nth-child(6) {
    animation-delay: 0.6s;
}

.step:nth-child(1) {
    animation-delay: 0.1s;
}

.step:nth-child(3) {
    animation-delay: 0.2s;
}

.step:nth-child(5) {
    animation-delay: 0.3s;
}

.advantage-card:nth-child(1) {
    animation-delay: 0.1s;
}

.advantage-card:nth-child(2) {
    animation-delay: 0.2s;
}

.advantage-card:nth-child(3) {
    animation-delay: 0.3s;
}

.scenario-item:nth-child(1) {
    animation-delay: 0.1s;
}

.scenario-item:nth-child(2) {
    animation-delay: 0.2s;
}

.scenario-item:nth-child(3) {
    animation-delay: 0.3s;
}

.scenario-item:nth-child(4) {
    animation-delay: 0.4s;
}

.scenario-item:nth-child(5) {
    animation-delay: 0.5s;
}

.scenario-item:nth-child(6) {
    animation-delay: 0.6s;
}

/* 滚动动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.6s ease;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}