:root{--bg-color: #131722;--panel-color: #1e222d;--text-color: #d1d4dc;--accent-color: #2962ff}body{margin:0;background-color:var(--bg-color);color:var(--text-color);font-family:sans-serif}.app-container{display:flex;flex-direction:column;height:100vh;max-width:100%}header{background-color:var(--panel-color);padding:15px 20px;display:flex;align-items:center;border-bottom:1px solid #2a2e39}h1{margin:0 30px 0 0;font-size:1.2rem}select{background-color:#2a2e39;color:var(--text-color);border:1px solid #363a45;padding:8px 12px;border-radius:4px;outline:none;cursor:pointer}.chart-wrapper{flex:1;position:relative;width:100%}