* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; padding: 20px; background: #f5f5f5; }
.container { max-width: 1200px; margin: 0 auto; background: white; border-radius: 12px; padding: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
h1 { margin-bottom: 20px; color: #333; }
.controls { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; align-items: center; }
.btn-group { display: flex; gap: 5px; }
.btn { padding: 10px 20px; border: none; border-radius: 6px; cursor: pointer; font-size: 14px; transition: all 0.2s; background: #e0e0e0; color: #333; }
.btn:hover { background: #d0d0d0; }
.btn.active { background: #4CAF50; color: white; }
.nav { display: flex; align-items: center; gap: 15px; margin-left: auto; }
.nav-btn { background: #2196F3; color: white; padding: 8px 16px; }
.nav-btn:hover { background: #1976D2; }
.nav-btn:disabled { background: #ccc; cursor: not-allowed; }
.current-period { font-size: 18px; font-weight: bold; color: #333; }
.date-picker { padding: 6px 8px; border: 1px solid #ddd; border-radius: 6px; font-size: 15px; font-weight: 550; }
.date-picker:disabled { background: #f0f0f0; color: #999; }
.chart-container { position: relative; height: 400px; }
.stats { display: flex; gap: 20px; margin-top: 20px; padding: 15px; background: #f9f9f9; border-radius: 8px; }
.stat { flex: 1; text-align: center; }
.stat-value { font-size: 24px; font-weight: bold; color: #4CAF50; }
.stat-label { color: #666; font-size: 14px; }