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

:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #f44336;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --bg-light: #f5f5f5;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #ffffff;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 20px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.info-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

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

.main-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.editor-panel {
    display: flex;
    flex-direction: column;
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s ease;
}

.editor-panel:hover {
    box-shadow: var(--shadow-lg);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.3rem;
    color: var(--text-primary);
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: 8px;
}

textarea {
    flex: 1;
    min-height: 400px;
    padding: 15px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    background: var(--bg-light);
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #ffffff;
}

textarea.dragover {
    border: 2px dashed var(--primary-color) !important;
    background: #E3F2FD !important;
}

textarea::placeholder {
    color: var(--text-secondary);
}

#outputSQL {
    background: var(--bg-light);
}

.char-count {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: right;
}

.char-count span {
    font-weight: 600;
    color: var(--text-primary);
}

.action-panel {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 20px;
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    min-width: 240px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
}

.btn span {
    font-size: 16px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.btn-success:hover {
    background: #45a049;
}

.btn-info {
    background: #00BCD4;
    color: white;
}

.btn-info:hover {
    background: #00ACC1;
}

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

.btn-warning:hover {
    background: #e68900;
}

.btn-secondary {
    background: #ffffff;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-light);
}

.btn-large {
    padding: 15px 25px;
    font-size: 16px;
}

.options {
    padding: 15px;
    background: var(--bg-light);
    border-radius: 8px;
    margin-top: 10px;
}

.options h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.checkbox-label {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    cursor: pointer;
    font-size: 14px;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
    width: 16px;
    height: 16px;
}

.select-label {
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 14px;
    margin-top: 10px;
}

.select-label select {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    background: white;
}

footer {
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.examples h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.example-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn-example {
    background: #ffffff;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-example:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 8px;
    font-weight: 600;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

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

.notification.error {
    background: var(--danger-color);
    color: white;
}

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

.notification.info {
    background: #2196F3;
    color: white;
}

/* 使用说明和功能区域 - 简化版 */
.usage-section {
    background: #f8f9fa;
    padding: 40px 20px;
    margin-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.usage-container {
    max-width: 1000px;
    margin: 0 auto;
}

/* 快速使用指南 */
.quick-guide {
    text-align: center;
    margin-bottom: 30px;
}

.quick-guide h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.guide-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.guide-steps .step {
    padding: 12px 20px;
    background: linear-gradient(135deg, #2196F3, #1976D2);
    color: white;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
}

.guide-steps .arrow {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
}

/* 功能展示 - 紧凑版 */
.features-compact {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.feature-box {
    background: white;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.feature-box:hover {
    transform: translateY(-3px);
}

.feature-box .icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.feature-box strong {
    display: block;
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 5px;
}

.feature-box p {
    color: #666;
    font-size: 0.85rem;
    margin: 0;
}

/* 快捷键 - 紧凑版 */
.shortcuts-compact {
    background: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    margin-bottom: 25px;
}

.shortcuts-compact h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.shortcuts-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.shortcuts-row span {
    color: #666;
    font-size: 0.9rem;
}

.shortcuts-row kbd {
    display: inline-block;
    padding: 4px 8px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    color: #333;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 5px;
}

/* 页脚 - 紧凑版 */
.footer-compact {
    text-align: center;
    padding: 20px;
    border-top: 1px solid #e0e0e0;
}

.footer-compact p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-compact strong {
    color: var(--primary-color);
}

.footer-compact a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 6px;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-compact a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    
    .action-panel {
        order: 2;
    }
    
    .action-panel {
        flex-direction: row;
        flex-wrap: wrap;
        min-width: auto;
    }
    
    .btn-large {
        flex: 1;
        min-width: 200px;
    }
    
    .options {
        width: 100%;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .main-content {
        gap: 15px;
    }
    
    .editor-panel {
        padding: 15px;
    }
    
    textarea {
        min-height: 300px;
        font-size: 13px;
    }
    
    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .button-group {
        width: 100%;
    }
    
    .btn {
        flex: 1;
    }
    
    /* 使用说明区域响应式 - 简化版 */
    .usage-section {
        padding: 30px 15px;
    }
    
    .quick-guide h2 {
        font-size: 1.3rem;
    }
    
    .guide-steps {
        padding: 15px;
        gap: 10px;
    }
    
    .guide-steps .step {
        padding: 10px 15px;
        font-size: 0.85rem;
    }
    
    .guide-steps .arrow {
        font-size: 1.2rem;
    }
    
    .features-compact {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .feature-box {
        padding: 15px;
    }
    
    .shortcuts-compact {
        padding: 20px 15px;
    }
    
    .shortcuts-compact h3 {
        font-size: 1.1rem;
    }
    
    .shortcuts-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .shortcuts-row kbd {
        font-size: 0.8rem;
        padding: 3px 6px;
    }
    
    .footer-compact {
        padding: 15px;
    }
    
    .footer-compact p {
        font-size: 0.85rem;
    }
}