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

/* 根元素样式 */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
}

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

/* 页面头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 30px 0;
}

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

.logo-section {
    flex: 1;
    position: relative;
}

.language-selector {
    position: absolute;
    top: 0;
    right: 0;
    margin: 10px;
}

.language-selector select {
    padding: 5px 10px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 14px;
    cursor: pointer;
    backdrop-filter: blur(10px);
}

.language-selector select:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.language-selector select option {
    background: white;
    color: var(--text-primary);
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 广告位样式 - 隐藏所有广告位 */
.ad-banner {
    display: none !important;
}

.ad-banner.ad-top {
    display: none !important;
}

.ad-banner.ad-middle {
    display: none !important;
}

.ad-sidebar {
    display: none !important;
}

.ad-placeholder {
    display: none !important;
}

/* 导航菜单样式 */
.main-nav {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 0;
}

.nav-item {
    flex: 1;
    text-align: center;
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.nav-item:hover {
    background-color: var(--background-color);
}

.nav-item.active {
    border-bottom-color: var(--primary-color);
    background-color: var(--background-color);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-text {
    font-weight: 500;
    color: var(--text-primary);
}

/* 主要内容区域 */
.main-content {
    padding: 40px 0;
    min-height: 60vh;
}

.content-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    align-items: start;
}

.content-main {
    min-width: 0;
}

.function-section {
    display: none;
}

.function-section.active {
    display: block;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 20px;
}

/* AI选项按钮样式 */
.ai-options {
    margin: 30px 0;
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.ai-options h4 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.ai-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-ai {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    min-width: 150px;
}

.btn-ai:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
}

.ai-icon {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.btn-ai small {
    font-size: 0.8rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 侧边栏样式 */
.sidebar {
    position: sticky;
    top: 20px;
}

.features-box,
.usage-box,
.formats-box {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.features-box h3,
.usage-box h3,
.formats-box h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.features-list {
    list-style: none;
}

.features-list li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.usage-list {
    padding-left: 20px;
    color: var(--text-secondary);
}

.usage-list li {
    margin-bottom: 8px;
}

.formats-grid {
    display: grid;
    gap: 15px;
}

.format-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.format-item strong {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.format-item span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 上传区域样式 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 60px 20px;
    text-align: center;
    background-color: var(--surface-color);
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: 30px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: #f8fafc;
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: #f0f9ff;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    opacity: 0.6;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.upload-content p {
    color: var(--text-secondary);
}

/* 图片编辑器样式 */
.image-editor {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

.editor-container {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
}

.editor-canvas {
    max-width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: crosshair;
}

.selection-box {
    position: absolute;
    border: 2px solid var(--primary-color);
    background-color: rgba(79, 70, 229, 0.1);
    cursor: move;
    display: none;
}

.selection-box::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border-radius: 50%;
    cursor: nw-resize;
}

.selection-box::after {
    content: '';
    position: absolute;
    bottom: -8px;
    right: -8px;
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border-radius: 50%;
    cursor: se-resize;
}

.editor-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 压缩编辑器样式 */
.compress-editor {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

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

.original-image h4,
.compressed-image h4 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.original-image img,
.compressed-image img {
    max-width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 10px;
}

.file-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: var(--background-color);
    padding: 8px 12px;
    border-radius: var(--border-radius);
    display: inline-block;
}

.compress-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    align-items: end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.control-group input,
.control-group select {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.control-group input[type="range"] {
    padding: 0;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

/* 转换编辑器样式 */
.convert-editor {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

.convert-preview {
    text-align: center;
    margin-bottom: 30px;
}

.convert-preview img {
    max-width: 100%;
    max-height: 400px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.convert-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    align-items: end;
}

/* 结果区域样式 */
.result-area {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.result-area h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.result-image {
    margin-bottom: 20px;
}

.result-image img {
    max-width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

/* 下载选项样式 */
.download-options {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.quality-selector {
    display: flex;
    align-items: center;
    gap: 10px;
}

.quality-selector label {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

.quality-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    background-color: var(--surface-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.quality-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* SEO内容区域样式 */
.seo-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-top: 40px;
    box-shadow: var(--shadow-sm);
}

.seo-content h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.seo-content h3 {
    color: var(--text-primary);
    margin: 30px 0 15px 0;
    font-size: 1.4rem;
}

.seo-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.seo-content ul {
    color: var(--text-secondary);
    padding-left: 20px;
    margin-bottom: 20px;
}

.seo-content li {
    margin-bottom: 10px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.feature-card {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.feature-card h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* FAQ样式 */
.faq-section {
    margin: 20px 0;
}

.faq-item {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    border-left: 4px solid var(--primary-color);
}

.faq-item h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.faq-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

/* 使用场景样式 */
.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.use-case-item {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.use-case-item h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.use-case-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-warning {
    background-color: var(--warning-color);
    color: white;
}

.btn-warning:hover {
    background-color: #d97706;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 页面底部样式 */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px 0;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    text-align: center;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .content-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .nav-list {
        flex-direction: column;
    }
    
    .nav-item {
        padding: 15px;
    }
    
    .editor-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .compress-controls,
    .convert-controls {
        grid-template-columns: 1fr;
    }
    
    .editor-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .ai-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-ai {
        width: 100%;
        max-width: 280px;
    }
    
    .download-options {
        flex-direction: column;
        gap: 15px;
    }
    
    .quality-selector {
        flex-direction: column;
        gap: 8px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 20px 0;
    }
    
    .main-content {
        padding: 20px 0;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .image-editor,
    .compress-editor,
    .convert-editor,
    .result-area,
    .seo-content {
        padding: 20px;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .logo {
        font-size: 1.8rem;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 工具提示 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--text-primary);
    color: white;
    text-align: center;
    border-radius: var(--border-radius);
    padding: 8px 12px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.9rem;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}