:root {
    /* 默认主题（商务专业风） */
    --primary-color: #1e3a8a;
    --secondary-color: #374151;
    --accent-color: #3b82f6;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --font-size: 12px;
    --font-family: 'Microsoft YaHei', 'SimHei', sans-serif;
}

/* 科技未来风主题 */
[data-theme="tech"] {
    --primary-color: #06b6d4;
    --secondary-color: #0ea5e9;
    --accent-color: #10b981;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
}

/* 简约清新风主题 */
[data-theme="minimal"] {
    --primary-color: #10b981;
    --secondary-color: #059669;
    --accent-color: #f59e0b;
    --bg-color: #f0fdf4;
    --card-bg: #ffffff;
    --text-color: #064e3b;
    --text-muted: #047857;
    --border-color: #d1fae5;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.controls {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 0 2rem 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    color: var(--text-color);
}

.control-group select, 
.control-group input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
}

.control-group input[type="range"] {
    width: 120px;
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    padding: 0 2rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.chart-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chart-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.chart-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    text-align: center;
}

.chart {
    width: 100%;
    height: 400px;
    border-radius: 8px;
}

.footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .charts-container {
        grid-template-columns: 1fr;
        padding: 0 1rem 1rem;
        gap: 1rem;
    }
    
    .controls {
        margin: 0 1rem 1rem;
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .control-group {
        justify-content: space-between;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .chart {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .chart {
        height: 250px;
    }
    
    .header {
        padding: 1.5rem 1rem;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}