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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #ffffff;
    --surface: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #ffffff;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--background);
    border-radius: 16px;
    box-shadow: 0 0 0 1px var(--border-color);
    overflow: hidden;
}

/* 头部样式 */
.header {
    background: white;
    color: var(--text-primary);
    padding: 40px 20px;
    border-bottom: 2px solid var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.08));
}

.header-text {
    text-align: left;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* 主内容区域 */
.main-content {
    padding: 40px;
}

/* 控制面板 */
.control-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    gap: 20px;
    flex-wrap: wrap;
}

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

.language-selector label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* 选项组 */
.options-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-text {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.checkbox-label:hover .checkbox-text {
    color: var(--primary-color);
}

.select-box {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--background);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 200px;
}

.select-box:hover {
    border-color: var(--primary-color);
}

.select-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* 按钮组 */
.button-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

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

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

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

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

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.icon {
    width: 18px;
    height: 18px;
}

/* 编辑器容器 */
.editor-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    margin-bottom: 30px;
    align-items: stretch;
}

.editor-panel {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.editor-panel:focus-within {
    border-color: var(--primary-color);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: white;
    border-bottom: 2px solid var(--border-color);
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.char-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.code-editor {
    flex: 1;
    padding: 20px;
    border: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    background: var(--surface);
    color: var(--text-primary);
    min-height: 400px;
}

.code-editor:focus {
    outline: none;
}

.code-editor::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* 分隔符 */
.divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.arrow-icon {
    width: 32px;
    height: 32px;
    color: var(--text-secondary);
    opacity: 0.5;
}

/* 统计面板 */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding: 24px;
    background: var(--surface);
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* 功能说明区域 */
.features {
    padding: 40px;
    background: var(--surface);
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* 相关工具推荐 - 隐藏显示但保留SEO链接 */
.related-tools {
    display: none;
    /* SEO优化：保留HTML中的链接供搜索引擎抓取，但不在页面上显示 */
}

.related-tools h2 {
    text-align: center;
    color: var(--text-primary);
    font-size: 1.8rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.related-tools-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1rem;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.related-tool-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.related-tool-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(74, 144, 226, 0.2);
}

.related-tool-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    transition: transform 0.3s ease;
}

.related-tool-card:hover .related-tool-icon {
    transform: scale(1.2);
}

.related-tool-card h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.related-tool-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .related-tools-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
    }
    
    .related-tool-card {
        padding: 20px;
    }
    
    .related-tools h2 {
        font-size: 1.5rem;
    }
    
    .related-tool-icon {
        font-size: 2rem;
    }
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 20px;
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 2px solid var(--border-color);
}

.footer p {
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 12px;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    padding: 4px 8px;
    border-radius: 4px;
}

.footer-link:hover {
    color: var(--primary-hover);
    background: rgba(74, 144, 226, 0.1);
    transform: translateY(-1px);
}

.footer-separator {
    color: var(--text-secondary);
    opacity: 0.5;
    user-select: none;
}

/* 提示消息 */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 16px 24px;
    background: var(--text-primary);
    color: white;
    border-radius: 8px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.toast.success {
    background: var(--success);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .editor-container {
        grid-template-columns: 1fr;
    }

    .divider {
        display: none;
    }

    .control-panel {
        flex-direction: column;
        align-items: stretch;
    }

    .language-selector {
        width: 100%;
    }

    .select-box {
        flex: 1;
    }

    .options-group {
        width: 100%;
        justify-content: center;
    }

    .button-group {
        width: 100%;
    }

    .button-group .btn {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .header-text {
        text-align: center;
    }

    .logo {
        width: 64px;
        height: 64px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .main-content {
        padding: 20px;
    }

    .features {
        padding: 20px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .header {
        padding: 30px 20px;
    }

    .logo {
        width: 56px;
        height: 56px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .stats-panel {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }
}

/* 滚动条样式 */
.code-editor::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

.code-editor::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 5px;
}

.code-editor::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 5px;
}

.code-editor::-webkit-scrollbar-thumb:hover {
    background: var(--text-primary);
}