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

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

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

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.card h3 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.4rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 10px;
}

/* 数据选择区域 */
.data-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.data-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.data-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 上传区域 */
.upload-area {
    border: 2px dashed #cbd5e0;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f7fafc;
}

.upload-content {
    color: #718096;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.upload-btn {
    background: #48bb78;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 15px;
    transition: background 0.3s ease;
}

.upload-btn:hover {
    background: #38a169;
}

/* 控制面板 */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

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

.control-group label {
    font-weight: 600;
    color: #4a5568;
}

.control-group select,
.control-group input {
    padding: 10px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.control-group select:focus,
.control-group input:focus {
    outline: none;
    border-color: #667eea;
}

/* 图表容器 */
.chart-container {
    position: relative;
    height: 500px;
    width: 100%;
    margin: 20px 0;
}

.chart-controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.control-btn {
    background: #edf2f7;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.control-btn:hover {
    background: #e2e8f0;
    transform: translateY(-1px);
}

/* 数据表格 */
.table-container {
    max-height: 400px;
    overflow: auto;
    margin-top: 15px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

thead {
    background: #4a5568;
    color: white;
    position: sticky;
    top: 0;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    font-weight: 600;
}

tr:hover {
    background: #f7fafc;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.close-btn {
    background: #e53e3e;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.close-btn:hover {
    background: #c53030;
}

/* 加载指示器 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #e2e8f0;
    border-top: 5px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

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

/* 文件信息 */
.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #edf2f7;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

.clear-btn {
    background: #e53e3e;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .controls {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 400px;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .data-buttons {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: 20px;
    }
    
    .chart-container {
        height: 350px;
    }
    
    .control-group {
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .card {
        padding: 15px;
    }
    
    .chart-container {
        height: 300px;
    }
    
    .chart-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .control-btn {
        justify-content: center;
    }
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 滚动条样式 */
.table-container::-webkit-scrollbar {
    width: 8px;
}

.table-container::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.table-container::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}