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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 导航栏 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.language-switch {
    position: relative;
    display: inline-block;
}

.lang-dropdown-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
    justify-content: center;
}

.lang-dropdown-btn:hover {
    background: #e3f2fd;
    border-color: #3498db;
    color: #3498db;
}

.globe-icon {
    font-size: 16px;
}

.current-lang {
    font-weight: 600;
}

.dropdown-arrow {
    font-size: 10px;
    transition: transform 0.3s ease;
}

.lang-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    min-width: 120px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.lang-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border-radius: 6px;
    margin: 4px;
}

.lang-option:hover {
    background: #f8f9fa;
}

.lang-option.active {
    background: #e3f2fd;
    color: #3498db;
}

.lang-flag {
    font-size: 16px;
}

.lang-text {
    font-size: 14px;
    font-weight: 500;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo-img {
    width: 32px;
    height: 32px;
    margin-right: 10px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #2c3e50;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 8px 16px;
    border-radius: 6px;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
    background-color: #f8f9fa;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle-container {
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle-main {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    opacity: 0.95;
    line-height: 1.4;
    color: white;
}

.hero-subtitle-desc {
    font-size: 1rem;
    opacity: 0.8;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
    transform: translateY(-2px);
}

.hero-image {
    text-align: center;
}



.screenshot {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* 功能特性 */
.features {
    padding: 80px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #2c3e50;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 下载安装 */
.download {
    padding: 80px 0;
    background: #f8f9fa;
}

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

.download-info h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: #2c3e50;
}

.install-steps {
    margin-bottom: 30px;
    padding-left: 20px;
}

.install-steps li {
    margin-bottom: 15px;
    color: #555;
    line-height: 1.6;
}

.install-steps code {
    background: #e9ecef;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
}

.download-buttons {
    display: flex;
    gap: 20px;
}

.guide-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

/* 使用指南 */
.guide {
    padding: 80px 0;
    background: white;
}

.guide-tabs {
    max-width: 800px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    border-bottom: 2px solid #e9ecef;
}

.tab-btn {
    background: none;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover,
.tab-btn.active {
    color: #3498db;
    border-bottom-color: #3498db;
}

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

.tab-pane {
    display: none;
}

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

.tab-pane h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #2c3e50;
}

.tab-pane ul {
    list-style: none;
    padding-left: 0;
}

.tab-pane li {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
    color: #555;
    line-height: 1.6;
}

.tab-pane li:before {
    content: "•";
    color: #3498db;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* 支持我们 */
.support {
    padding: 80px 0;
    background: #f8f9fa;
    text-align: center;
}

.support-text {
    max-width: 600px;
    margin: 0 auto 40px;
}

.support-text p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 15px;
}

.support-options {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.support-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px 20px;
    background: white;
    border-radius: 12px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    min-width: 150px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.support-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.btn-icon {
    font-size: 2rem;
    margin-bottom: 15px;
}



/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ecf0f1;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* 法律页面通用样式（隐私政策、用户协议） */
.main-content {
    margin-top: 70px;
    padding: 40px 0;
    background: #ffffff;
}

.legal-header {
    text-align: center;
    margin-bottom: 50px;
}

.legal-header h1 {
    font-size: 2.8rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 15px;
}

.last-updated {
    color: #666;
    font-size: 1rem;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.legal-section {
    margin-bottom: 40px;
}

.legal-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e9ecef;
}

.legal-section h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #34495e;
    margin: 25px 0 15px;
}

.legal-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #34495e;
    margin: 20px 0 10px;
}

.legal-section p {
    margin-bottom: 16px;
    color: #2c3e50;
    line-height: 1.7;
    font-size: 1rem;
}

.legal-section ul {
    margin: 16px 0;
    padding-left: 25px;
}

.legal-section li {
    margin-bottom: 8px;
    color: #2c3e50;
    line-height: 1.6;
    font-size: 1rem;
}

.legal-section a {
    color: #3498db;
    text-decoration: none;
}

.legal-section a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .legal-content {
        padding: 0 15px;
    }
    
    .legal-header h1 {
        font-size: 2.2rem;
    }
    
    .legal-section h2 {
        font-size: 1.6rem;
    }
    
    .legal-section h3 {
        font-size: 1.3rem;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle-main {
        font-size: 1.3rem;
    }
    
    .hero-subtitle-desc {
        font-size: 0.9rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .tab-buttons {
        flex-wrap: wrap;
    }
    
    .support-options {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .privacy-header h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
}