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

:root {
    --primary-teal: #2DD4BF;
    --primary-teal-dark: #14B8A6;
    --primary-blue: #3B82F6;
    --primary-blue-dark: #2563EB;
    --gradient-start: #E0F2FE;
    --gradient-mid: #E0F7FA;
    --gradient-end: #CCFBF1;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-teal-light: #f0fdfa;
    --bg-blue-light: #eff6ff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family:"微软雅黑", 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-white);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 顶部导航 */
.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 16px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header.scrolled {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
    border-bottom: none;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    transition: all 0.3s ease;
}
.logo-icon img {
	width:100%;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.header.scrolled .logo-text {
    color: #1e293b;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
    justify-content: center;
}
.nav_m {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-teal);
}

.nav-link.active {
    color: var(--primary-teal);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-teal), var(--primary-blue));
    border-radius: 2px;
}

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

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
    width: 44px;
    height: 44px;
    position: relative;
}

.mobile-menu-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.menu-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: background 0.3s ease;
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

.menu-icon::before {
    top: -8px;
}

.menu-icon::after {
    top: 8px;
}

.mobile-menu-btn.active .menu-icon {
    background: transparent;
}

.mobile-menu-btn.active .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn.active .menu-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

.mobile-nav-extra {
    display: none;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.mobile-nav-extra .language-selector {
    margin-right: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        bottom: 0;
        height: 0;
        background: var(--bg-white);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        flex-wrap: wrap;
        align-items: flex-start;
        padding: 0 24px;
        gap: 0;
        overflow: hidden;
        overflow-y: auto;
        transition: all 0.3s ease;
        z-index: 999;
    }
	
	.nav_m {
		display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        width: 100%;
		flex: initial;
	}
    
    .nav.active {
        height: calc(100vh - 80px);
        padding: 16px;
		justify-content: flex-start;
    }
    
    .nav-link {
        padding: 8px 0;
        text-align: center;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .mobile-nav-extra {
        display: flex;
        width: 100%;
		margin-top: 16px;
		border-top: none;
		padding-top: 0;
        gap: 12px;
    }
    
    .header-right .language-selector,
    .header-right .header-btn {
        display: none;
    }
    
    /* 调整移动端的feature-row布局 */
    .feature-row {
        flex-direction: column;
    }
    
    .feature-row .feature-image {
        order: 2;
        margin-top: 0px;
    }
    
    .feature-row .feature-text {
        order: 1;
    }
    
    /* AI工具移动端布局 */
    .ai-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Hero区域顶部间距 */
    .hero {
        padding-top: 100px;
    }
}

.lang-select-container {
    position: relative;
    z-index: 1001;
}

.lang-select-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 0 16px;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    background: var(--bg-white);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
	height: 50px;
}

.lang-select-header:hover {
    border-color: var(--primary-teal);
    box-shadow: var(--shadow-sm);
}
.fa-chevron-down {
	width:0; 
    height:0; 
    border-left:6px solid transparent;
    border-right:6px solid transparent;
    border-top:6px solid #99FFFF;
}

.lang-select-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: none;
    max-height: 300px;
    overflow-y: auto;
}

.lang-select-dropdown.show {
    display: block;
}

.lang-option {
    padding: 10px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 14px;
}

.lang-option:hover {
    background-color: var(--bg-teal-light);
}

.lang-option.active {
    background-color: var(--gradient-mid);
    color: var(--text-primary);
}

.header.scrolled .nav a {
    color: #475569;
}

.header.scrolled .nav a:hover {
    color: #1e293b;
}

.header-btn {
    padding: 0 32px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px -5px rgba(59, 130, 246, 0.3);
	height:50px;
}

.header-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px -8px rgba(59, 130, 246, 0.4);
}

.header.scrolled .header-btn {
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-blue) 100%);
    color: white;
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, #E0F2FE 0%, #E0F7FA 50%, #CCFBF1 100%);
    padding: 160px 0 100px 0;
    position: relative;
    overflow: hidden;
    margin-top: 0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.5) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-desc {
    font-size: 18px;
    color: #475569;
    margin-bottom: 32px;
    line-height: 1.8;
    max-width: 500px;
}

.hero-btn {
    padding: 20px 60px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 50px;
    color: white;
    font-size: 24px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 12px 30px -8px rgba(59, 130, 246, 0.4);
}

.hero-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 35px -10px rgba(59, 130, 246, 0.5);
}
.hero-btn i {
	width:36px;
	height:36px;
}
.hero-btn i img {
	width:100%;
}

.hero-image {
    flex: 1;
    text-align: center;
	background: #fff;
	border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    animation: float 3s ease-in-out infinite;
	overflow: hidden;
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* 副标题区域 */
.sub-hero {
    background: var(--bg-white);
    padding: 60px 0 0px 0;
    text-align: center;
}

.sub-hero-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.sub-hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 功能区域 */
.feature-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.feature-section.alt-bg {
    background: var(--bg-teal-light);
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 30px;
}

.feature-row.reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.feature-title.text-center {
    text-align: center;
    margin-bottom: 24px;
}

.feature-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.feature-desc.text-center {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 48px;
}

.feature-desc.mb-60 {
    margin-bottom: 60px;
}

.feature-list {
    margin-bottom: 32px;
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 16px;
}

.feature-list li i {
    color: var(--primary-teal);
    font-size: 18px;
}

.feature-btn {
    padding: 20px 48px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 50px;
    color: white;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.35);
}

.feature-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px -8px rgba(59, 130, 246, 0.45);
}

.feature-image {
    flex: 1;
}

.feature-image img {
    max-width: 100%;
    height: auto;
}

/* 在线转换器容器 */
.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    background: var(--bg-white);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.converter-left {
    display: flex;
    flex-direction: column;
}

.converter-right {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.converter-left h4,
.converter-right h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.converter-step {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-light);
	min-height: 500px;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
}

.upload-area:hover {
    border-color: var(--primary-teal);
    background: var(--bg-teal-light);
}

.upload-area.dragover {
    border-color: var(--primary-blue);
    background: var(--bg-blue-light);
    transform: scale(1.02);
    transition: all 0.2s ease;
}

.upload-area i {
    color: var(--primary-teal);
    margin-bottom: 16px;
}
.fa-cloud-upload-alt {
	width:64px;
	height:64px;
}
.fa-cloud-upload-alt img {
	width:100%;
}

.upload-area p {
    color: var(--text-secondary);
    font-size: 18px;
}

.file-input {
    display: none;
}

.format-selector {
    margin-bottom: 16px;
}

.format-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    color: var(--text-primary);
    background: var(--bg-white);
    transition: all 0.3s ease;
}

.format-select:focus {
    outline: none;
    border-color: var(--primary-teal);
    box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.1);
}

.convert-btn {
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 25px;
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 8px 20px -5px rgba(59, 130, 246, 0.3);
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
}

.converter-result {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.result-area {
    text-align: center;
    padding: 24px;
    background: var(--bg-light);
    border-radius: 12px;
}

.download-btn {
    margin-top: 16px;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-blue) 100%);
    border: none;
    border-radius: 25px;
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 6px 16px -4px rgba(45, 212, 191, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -5px rgba(45, 212, 191, 0.4);
}

/* 加载动画 */
.loading-spinner {
    width: 32px;
    height: 32px;
    border: 4px solid var(--bg-light);
    border-top: 4px solid var(--primary-teal);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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


/* 合并拆分工具网格 */
.merge-split-tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.merge-split-tool-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 24px 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    text-align: center;
}

.merge-split-tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-teal);
}

.merge-split-tool-card .tool-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
    color: white;
}

.merge-split-tool-card .tool-icon img {
	width:70%;
}

.merge-split-tool-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.merge-split-tool-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* AI工具网格 */
.ai-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.ai-tool-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 28px 20px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    text-align: center;
}

.ai-tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-teal);
}

.ai-tool-card .tool-icon {
    width: 86px;
    height: 86px;
    background: linear-gradient(135deg, rgba(57, 139, 240, .1) 0%, rgba(46, 203, 197, .1) 100%);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: white;
}
.ai-tool-card .tool-icon img {
	width:70%;
}

.fa-check-circle {
	width:28px;
	height:28px;
}
.fa-check-circle img {
	width:100%;
}

.ai-tool-card h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.ai-tool-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 内容处理工具网格 */
.content-tools-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.content-tool-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 32px 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    text-align: center;
}

.content-tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-teal);
}

.content-tool-card.hot {
    /* 移除橙色边框 */
}

.content-tool-card .tool-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(57,139,240,.1) 0%, rgba(46,203,197,.1) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: white;
}

.content-tool-card .tool-icon img {
	width:70%;
}

.content-tool-card .tool-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: #f16e6e;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.content-tool-card h4 {
    font-size: 17px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.content-tool-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
    min-height: 48px;
}

.content-tool-card .tool-btn {
    width: 100%;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 17px;
    font-weight: normal;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px -2px rgba(59, 130, 246, 0.3);
}

.content-tool-card .tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px -4px rgba(59, 130, 246, 0.4);
}

/* 水印处理工具网格 */
.watermark-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
	margin-top: 30px;
}

.watermark-tool-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 40px 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    text-align: center;
}

.watermark-tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-teal);
}

.watermark-tool-card .tool-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 32px;
    color: white;
}
.watermark-tool-card .tool-icon img {
	width:64%;
}

.watermark-tool-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4rem;
	min-height:2.8rem;
}

.watermark-tool-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 下载区域 */
.download-section {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-teal-light) 100%);
    padding: 80px 0;
    text-align: center;
}

.download-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.download-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.download-platforms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 48px;
}

.platform-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 40px 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    border: 2px solid transparent;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.platform-card.featured {
    border-color: var(--primary-teal);
    transform: scale(1.05);
}

.platform-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.platform-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    color: white;
    padding: 4px 16px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.platform-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 40px;
    color: white;
}

.platform-icon img {
	width:70%;
}

.platform-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.platform-version {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.platform-size {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.platform-btn {
    width: 100%;
    padding: 22px 28px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 50px;
    color: white;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.35);
}

.platform-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px -8px rgba(59, 130, 246, 0.45);
}

/* 下载统计区域 */
.download-stats-section {
    background: linear-gradient(135deg, #E0F2FE 0%, #E0F7FA 50%, #CCFBF1 100%);
    padding: 60px 0;
    text-align: center;
}

.download-stats {
    display: flex;
    justify-content: space-around;
    gap: 80px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.stat-item i {
    color: white;
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-blue) 100%);
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    box-shadow: 0 8px 20px rgba(45, 212, 191, 0.3);
}
.stat-item i img {
	width:70%;
}

.stat-item span {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 60px 0 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    padding-bottom: 40px;
}

.footer-brand {
    display: block;
	flex:1;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo-icon {
    width: 56px;
    height: 56px;
    background:#fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}
.footer-logo-icon img {
	width:80%;
}

.footer-logo-text {
    font-size: 18px;
    font-weight: 600;
}

.footer-description {
    margin-top: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
}

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

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 0;
    transition: color 0.2s ease;
}

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

.language-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
}

.language-list a {
    padding: 4px 0;
    font-size: 12px;
}

.footer-language-section {
    padding: 40px 0;
    margin-top: 0;
}

.language-section-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
    color: white;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    max-width: 800px;
    margin: 0 auto;
}

.language-grid a {
    display: block;
    text-align: center;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.language-grid a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-color: var(--primary-teal);
    transform: translateY(-2px);
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 13px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-teal) 100%);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}
.back-to-top img {
	width:70%;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text {
        order: 1;
    }

    .hero-image {
        order: 2;
    }

    .hero-desc {
        max-width: 100%;
    }

    .feature-row,
    .feature-row.reverse {
        flex-direction: column;
        gap: 40px;
    }

    .content-tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .watermark-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .ai-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-platforms {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .content-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .watermark-tools-grid {
        grid-template-columns: 1fr;
    }

    .merge-split-tools-grid {
        grid-template-columns: 1fr;
    }

    .ai-tools-grid {
        grid-template-columns: 1fr;
    }

    .converter-container {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .upload-area {
        padding: 32px 16px;
		min-height: 300px;
    }

    .upload-area i {
        font-size: 36px;
    }

    .container {
        padding: 0 16px;
    }
    
    .header-right {
        gap: 16px;
    }

    .header-btn {
        padding: 10px 24px;
        font-size: 16px;
    }
    
    .mobile-nav-extra .language-selector {
        width: 100%;
    }
    
    .mobile-nav-extra .lang-select-header {
        width: 100%;
        justify-content: center;
    }
    
    .mobile-nav-extra .header-btn {
        width: 100%;
    }

    .hero {
        padding: 120px 0 40px 0;
    }

    .hero-title {
        font-size: 28px;
    }

    .sub-hero-title {
        font-size: 22px;
    }

    .feature-section {
        padding: 60px 0;
    }

    .feature-title {
        font-size: 22px;
    }

    .download-platforms {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .platform-card.featured {
        transform: none;
    }

    .platform-card.featured:hover {
        transform: translateY(-8px);
    }

    .download-stats {
        flex-direction: row;
        gap: 40px;
    }

    .stat-item i {
        width: 64px;
        height: 64px;
    }

    .stat-item span {
        font-size: 14px;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }

    .footer-brand {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 40px;
        justify-content: center;
    }

    .footer-col {
        text-align: center;
    }

    .language-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .language-grid a {
        padding: 8px 12px;
        font-size: 13px;
    }
	.hero-btn {
		padding:15px 60px;
	}
	.content-tool-card h4 {
		margin-bottom:10px;
		font-size:20px;
	}
	.content-tool-card p {
		margin-bottom:10px;
	}
	.watermark-tool-card {
		padding:20px;
	}
	.watermark-tool-card h4 {
		margin-bottom:10px;
		min-height: inherit;
	}
	.platform-icon {
		width:72px;
		height:72px;
	}
	.download-section {
		padding:40px 0;
	}
	.footer {
		padding:0;
	}
}

@media (max-width: 480px) {
    .content-tools-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .feature-title {
        font-size: 20px;
    }

    .download-title {
        font-size: 28px;
    }

    .stat-item span {
        font-size: 16px;
    }
}