:root{--primary-color: #3498db;--secondary-color: #2c3e50;--accent-color: #e74c3c;--light-bg: #ecf0f1;--dark-bg: #34495e;--text-color: #2c3e50;--white: #ffffff;--shadow: 0 4px 6px rgba(0, 0, 0, .1);--status-full: #e74c3c;--status-almost-full: #f39c12;--status-balanced: #2ecc71;--status-almost-empty: #f1c40f;--status-empty: #c0392b}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--light-bg);padding:20px}#app{max-width:1200px;margin:0 auto}header{background-color:var(--white);border-radius:8px;padding:20px;margin-bottom:20px;box-shadow:var(--shadow)}h1{color:var(--primary-color);margin-bottom:20px;text-align:center}h2{color:var(--secondary-color);margin-bottom:15px;font-size:1.2rem}.controls{display:flex;flex-wrap:wrap;gap:15px;align-items:center;justify-content:center}.control-group{display:flex;align-items:center;gap:5px}button{border:none;padding:10px 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