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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: #667eea;
}

.nav-logo i {
    margin-right: 10px;
    font-size: 28px;
}

    .nav-menu {
        display: flex;
        gap: 30px;
        align-items: center;
    }

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

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #667eea;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* 主要内容区域 */
main {
    margin-top: 70px;
}

/* 英雄区域样式 */
.hero {
    padding: 80px 0;
    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;
    background: linear-gradient(45deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    padding: 15px 20px;
    border-radius: 25px;
    backdrop-filter: blur(10px);
}

.feature-item i {
    font-size: 20px;
    color: #ffd700;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-demo {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.demo-video {
    width: 400px;
    height: 300px;
    object-fit: cover;
    border-radius: 20px;
    display: block;
}

.video-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
    padding: 20px;
    text-align: center;
}

.video-overlay p {
    font-size: 16px;
    font-weight: 500;
    opacity: 0.9;
    margin: 0;
}

/* 上传区域样式 */
.upload-section {
    padding: 80px 0;
    background: white;
}

.upload-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f0ff 100%);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #764ba2;
    background: linear-gradient(135deg, #f0f4ff 0%, #e0e8ff 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: linear-gradient(135deg, #e8f0ff 0%, #d0e0ff 100%);
    transform: scale(1.02);
}

.upload-content i {
    font-size: 60px;
    color: #667eea;
    margin-bottom: 20px;
}

.upload-content h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: #333;
}

.upload-content p {
    color: #666;
    margin-bottom: 30px;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

#fileInput {
    display: none;
}

/* 预览区域样式 */
.preview-container {
    margin-top: 40px;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.preview-header h3 {
    font-size: 24px;
    color: #333;
}

.process-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.3);
}

.process-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.4);
}

.image-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    align-items: start;
}

.preview-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    background: #f8f9fa;
    padding: 10px;
}

.preview-item img {
    width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: contain;
    border-radius: 15px;
}

.preview-item .remove-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 0, 0, 0.8);
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
}

/* 结果区域样式 */
.result-container {
    margin-top: 40px;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.result-header h3 {
    font-size: 24px;
    color: #333;
}

.result-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.reset-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.result-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.original-image, .processed-image {
    text-align: center;
}

.original-image h4, .processed-image h4 {
    margin-bottom: 20px;
    color: #333;
    font-size: 18px;
}

.original-image div, .processed-image div {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.original-image img, .processed-image img {
    width: 100%;
    height: auto;
    display: block;
}

.result-image-item {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 15px;
    border: 1px solid #e9ecef;
}

.result-image-item h5 {
    margin-bottom: 15px;
    color: #333;
    font-size: 16px;
    font-weight: 600;
}

.result-image-item img {
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.error-message {
    color: #dc3545;
    font-size: 14px;
    margin-top: 10px;
    text-align: center;
    font-weight: 500;
}

/* 功能特性样式 */
.features {
    padding: 80px 0;
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #333;
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.feature-icon i {
    font-size: 35px;
    color: white;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #333;
}

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

/* 使用说明样式 */
.how-to {
    padding: 80px 0;
    background: white;
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.step-content p {
    color: #666;
    line-height: 1.6;
}

/* 关于我们样式 */
.about {
    padding: 80px 0;
    background: #f8f9fa;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 18px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
}

/* 页脚样式 */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 30px 0;
}

.footer p {
    opacity: 0.8;
}

/* 加载提示样式 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-content {
    text-align: center;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loading-content p {
    font-size: 18px;
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-features {
        justify-content: center;
    }
    
    .nav-menu {
        display: none;
    }
    
    .demo-video {
        width: 100%;
        max-width: 175px;
        height: 125px;
    }
    
    .image-preview {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
    }
    
    .result-comparison {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        grid-template-columns: 1fr;
    }
    
    .result-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .result-actions {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .demo-video {
        width: 100%;
        max-width: 150px;
        height: 100px;
    }
    
    .image-preview {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .container {
        padding: 0 15px;
    }
}

/* 语言选择器样式 */
.language-selector {
    position: relative;
    margin-left: 20px;
}

.language-current {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.language-current:hover {
    background: rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.3);
}

.language-flag {
    font-size: 18px;
}

.language-name {
    font-size: 14px;
    font-weight: 500;
    color: #667eea;
}

.language-current i {
    font-size: 12px;
    color: #667eea;
    transition: transform 0.3s ease;
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    padding: 10px 0;
    margin-top: 10px;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

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

.language-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    cursor: pointer;
    transition: background 0.2s ease;
    color: #333;
}

.language-option:hover {
    background: rgba(102, 126, 234, 0.1);
}

.language-option .language-flag {
    font-size: 20px;
}

.language-option span:last-child {
    font-size: 14px;
    font-weight: 500;
}

/* 响应式语言选择器 */
@media (max-width: 768px) {
    .language-selector {
        margin-left: 15px;
    }
    
    .language-current {
        padding: 6px 12px;
    }
    
    .language-name {
        display: none;
    }
    
    .language-dropdown {
        right: -10px;
        min-width: 160px;
    }
}