:root{--primary: #2563eb;--primary-dark: #1d4ed8;--success: #16a34a;--warning: #f59e0b;--danger: #dc2626;--bg: #f8fafc;--bg-card: #ffffff;--text: #1e293b;--text-muted: #64748b;--border: #e2e8f0;--sidebar-w: 288px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Pretendard,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.app-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);background:#1e293b;color:#e2e8f0;padding:1rem 0;position:fixed;top:0;left:0;height:100vh;overflow-y:auto;z-index:100}.sidebar h1{font-size:1.1rem;padding:.5rem 1.2rem 1rem;border-bottom:1px solid #334155;margin-bottom:.5rem}.sidebar nav a{display:flex;align-items:center;gap:.5rem;padding:.6rem 1.2rem;color:#94a3b8;text-decoration:none;font-size:.9rem;transition:all .15s}.sidebar nav a:hover,.sidebar nav a.active{background:#334155;color:#fff}.sidebar nav .section-title{font-size:1.4rem;text-transform:uppercase;color:#fff;padding:1rem 1.2rem .3rem;letter-spacing:.05em;font-weight:700;border-top:1px solid #334155;margin-top:.5rem}.main-content{margin-left:var(--sidebar-w);flex:1;padding:1.5rem 2rem;max-width:calc(100vw - var(--sidebar-w))}.page-title{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:.75rem;padding:1.5rem;margin-bottom:1rem}.card-title{font-size:1rem;font-weight:600;margin-bottom:1rem;color:var(--text)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:.75rem;padding:1.2rem;text-align:center}.stat-card .label{font-size:.8rem;color:var(--text-muted);margin-bottom:.25rem}.stat-card .value{font-size:1.8rem;font-weight:700;color:var(--primary)}.stat-card .sub{font-size:.75rem;color:var(--text-muted);margin-top:.2rem}.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1.2rem;border:none;border-radius:.5rem;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .15s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}.btn-danger{background:var(--danger);color:#fff}input,select{padding:.5rem .75rem;border:1px solid var(--border);border-radius:.5rem;font-size:.9rem;outline:none;transition:border-color .15s}input:focus,select:focus{border-color:var(--primary)}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.85rem;font-weight:500;margin-bottom:.3rem;color:var(--text)}.form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}table{width:100%;border-collapse:collapse;font-size:.85rem}th,td{padding:.6rem .8rem;text-align:left;border-bottom:1px solid var(--border)}th{background:#f1f5f9;font-weight:600;color:var(--text-muted);font-size:.8rem;position:sticky;top:0}tr:hover{background:#f8fafc}.text-right{text-align:right}.text-center{text-align:center}.progress-bar{width:100%;height:8px;background:var(--border);border-radius:4px;overflow:hidden}.progress-bar .fill{height:100%;background:var(--primary);transition:width .3s;border-radius:4px}.badge{display:inline-block;padding:.15rem .5rem;border-radius:1rem;font-size:.75rem;font-weight:500}.badge-success{background:#dcfce7;color:#166534}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-info{background:#dbeafe;color:#1e40af}.prediction-result{background:linear-gradient(135deg,#eff6ff,#dbeafe);border:2px solid var(--primary);border-radius:1rem;padding:2rem;text-align:center}.prediction-result .optimal-rate{font-size:3rem;font-weight:800;color:var(--primary)}.prediction-result .optimal-price{font-size:1.5rem;font-weight:600;color:var(--text);margin-top:.5rem}.chart-container{width:100%;height:400px}