:root{--primary: #4a90e2;--secondary: #50c878;--bg: #f5f7fa;--card-bg: #ffffff;--text: #333333;--text-light: #666666;--border: #e1e4e8}body{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;background-color:var(--bg);color:var(--text);margin:0;padding:0;display:flex;justify-content:center;min-height:100vh}#root{width:100%;max-width:480px;background-color:var(--card-bg);min-height:100vh;box-shadow:0 0 20px #0000000d;display:flex;flex-direction:column}.container{padding:20px;flex:1}h1,h2,h3{margin-top:0}button{cursor:pointer;border:none;font-family:inherit;transition:opacity .2s}button:active{opacity:.8}.card{background:white;border-radius:12px;padding:20px;margin-bottom:20px;border:1px solid var(--border);box-shadow:0 2px 4px #00000005}.btn-primary{background-color:var(--primary);color:#fff;padding:12px 20px;border-radius:8px;width:100%;font-size:16px;font-weight:600;margin-top:10px}.btn-secondary{background-color:var(--secondary);color:#fff;padding:12px 20px;border-radius:8px;width:100%;font-size:16px;font-weight:600;margin-top:10px}.btn-outline{background-color:transparent;color:var(--primary);border:1px solid var(--primary);padding:12px 20px;border-radius:8px;width:100%;font-size:16px;font-weight:600;margin-top:10px}.header{padding:20px;background:white;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.header h1{font-size:20px;margin:0}input{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;font-size:16px;box-sizing:border-box;margin-bottom:10px}.option-btn{background:#f8f9fa;border:1px solid var(--border);padding:15px;border-radius:8px;width:100%;text-align:left;margin-bottom:10px;font-size:16px}.option-btn:hover{background:#eef2f5}.stat-row{display:flex;justify-content:space-between;margin-bottom:8px;color:var(--text-light)}.nav-bar{display:flex;border-top:1px solid var(--border);background:white}.nav-item{flex:1;padding:15px;text-align:center;color:var(--text-light);text-decoration:none;font-size:14px}.nav-item.active{color:var(--primary);font-weight:700}