:root{--primary:#2563eb;--primary-dark:#1e3a8a;--primary-light:#3b82f6;--primary-bg:#eff6ff;--accent:#10b981;--accent-light:#34d399;--warning:#d97706;--danger:#dc2626;--text:#1f2937;--text-secondary:#6b7280;--bg:#f8fafc;--card:#fff;--border:#e5e7eb;--border-light:#f3f4f6;--shadow:0 1px 3px #0000001a, 0 1px 2px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--radius:8px;--radius-lg:12px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.6}#root{flex-direction:column;min-height:100vh;display:flex}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:24px}.btn{border-radius:var(--radius);cursor:pointer;border:1px solid #0000;align-items:center;gap:8px;padding:10px 20px;font-family:inherit;font-size:14px;font-weight:500;transition:all .15s;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:#1e3a8a}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{color:var(--text);border-color:var(--border);background:#fff}.btn-secondary:hover{background:var(--border-light)}.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:#047857}.btn-sm{padding:6px 12px;font-size:13px}.app-header{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;height:64px;padding:0 32px;display:flex}.app-header h1{color:var(--primary);letter-spacing:-.5px;font-size:20px;font-weight:700}.app-header .subtitle{color:var(--text-secondary);margin-left:12px;font-size:13px;font-weight:400}.stepper{border-bottom:1px solid var(--border);background:#fff;align-items:center;gap:4px;padding:16px 32px;display:flex;overflow-x:auto}.step{color:var(--text-secondary);white-space:nowrap;cursor:pointer;border-radius:20px;align-items:center;gap:8px;padding:8px 16px;font-size:13px;font-weight:500;transition:all .15s;display:flex}.step.active{background:var(--primary-bg);color:var(--primary)}.step.completed{color:var(--accent)}.step-number{background:var(--border-light);width:24px;height:24px;color:var(--text-secondary);border-radius:50%;justify-content:center;align-items:center;font-size:12px;font-weight:600;display:flex}.step.active .step-number{background:var(--primary);color:#fff}.step.completed .step-number{background:var(--accent);color:#fff}.step-arrow{color:var(--border);font-size:18px}.main-content{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:24px 32px}.upload-zone{border:2px dashed var(--border);border-radius:var(--radius-lg);text-align:center;cursor:pointer;background:#fff;padding:48px;transition:all .2s}.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary-light);background:var(--primary-bg)}.upload-zone .icon{margin-bottom:16px;font-size:48px}.upload-zone h3{margin-bottom:8px;font-size:18px}.upload-zone p{color:var(--text-secondary);font-size:14px}.data-preview{margin-top:16px;overflow-x:auto}.data-preview table{border-collapse:collapse;width:100%;font-size:13px}.data-preview th,.data-preview td{border:1px solid var(--border);text-align:left;padding:8px 12px}.data-preview th{background:var(--border-light);font-weight:600;position:sticky;top:0}.column-mapper{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-top:20px;display:grid}.column-mapper label{margin-bottom:4px;font-size:13px;font-weight:600;display:block}.column-mapper .hint{color:var(--text-secondary);margin-bottom:4px;font-size:11px}.column-mapper select{border:1px solid var(--border);border-radius:var(--radius);background:#fff;width:100%;padding:8px 12px;font-family:inherit;font-size:13px}.params-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;display:grid}.param-card{background:var(--border-light);border-radius:var(--radius);padding:16px}.param-card .label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-size:12px;font-weight:600}.param-card .value{color:var(--text);margin:4px 0;font-size:28px;font-weight:700}.param-card .unit{color:var(--text-secondary);font-size:14px;font-weight:400}.param-card .description{color:var(--text-secondary);margin-top:4px;font-size:12px}.slider-group{margin:20px 0}.slider-group label{justify-content:space-between;margin-bottom:8px;font-size:14px;font-weight:500;display:flex}.slider-group input[type=range]{-webkit-appearance:none;background:var(--border);border-radius:3px;outline:none;width:100%;height:6px}.slider-group input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--primary);cursor:pointer;border-radius:50%;width:20px;height:20px}.slider-labels{color:var(--text-secondary);justify-content:space-between;margin-top:4px;font-size:11px;display:flex}.results-table{border-collapse:collapse;width:100%;font-size:14px}.results-table th,.results-table td{border-bottom:1px solid var(--border);text-align:left;padding:12px 16px}.results-table th{background:var(--border-light);text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary);font-size:12px;font-weight:600}.results-table tr:hover{background:var(--primary-bg)}.recommendation{background:var(--primary-bg);border-radius:var(--radius);border:1px solid #bfdbfe;margin-top:20px;padding:16px 20px}.recommendation h4{color:var(--primary);margin-bottom:8px;font-size:14px}.recommendation p{font-size:14px;line-height:1.6}.warning-box{border-radius:var(--radius);background:#fef3c7;border:1px solid #fbbf24;margin-top:12px;padding:16px 20px}.warning-box h4{color:var(--warning);margin-bottom:4px;font-size:14px}.chart-container{border:1px solid var(--border);border-radius:var(--radius-lg);background:#fff;margin-top:16px;padding:20px}.chart-container h3{margin-bottom:16px;font-size:15px}.savings-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.saving-card{border:1px solid var(--border);border-radius:var(--radius-lg);text-align:center;background:#fff;padding:24px}.saving-card .amount{color:var(--accent);font-size:36px;font-weight:700}.saving-card .label{color:var(--text-secondary);margin-top:4px;font-size:14px}.two-col{grid-template-columns:1fr 1fr;gap:24px;display:grid}@media (width<=900px){.two-col{grid-template-columns:1fr}.main-content{padding:16px}.app-header,.stepper{padding:12px 16px}}.section-header{margin-bottom:20px}.section-header h2{letter-spacing:-.3px;font-size:22px;font-weight:700}.section-header p{color:var(--text-secondary);margin-top:4px;font-size:14px}.nav-buttons{border-top:1px solid var(--border);justify-content:space-between;margin-top:24px;padding-top:24px;display:flex}.form-row{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-top:16px;display:grid}.form-group label{margin-bottom:4px;font-size:13px;font-weight:500;display:block}.form-group input,.form-group select{border:1px solid var(--border);border-radius:var(--radius);width:100%;padding:8px 12px;font-family:inherit;font-size:14px}.annotation-deadtime{fill:#ef44441a;stroke:#ef4444}.annotation-tau{fill:#3b82f61a;stroke:#3b82f6}.recharts-wrapper,.recharts-wrapper *,.recharts-surface,.recharts-surface *{outline:none!important}.breadcrumbs{color:var(--text-secondary);align-items:baseline;font-size:13px;display:flex}.crumb-sep{color:var(--border);margin:0 6px}.crumb-link{color:var(--text-secondary);text-decoration:none;transition:color .15s}.crumb-link:hover{color:var(--primary)}.crumb-current{color:var(--text);font-weight:500}.user-chip{color:var(--text);background:var(--border-light);border-radius:20px;align-items:center;gap:6px;padding:6px 12px;font-size:13px;font-weight:500;text-decoration:none;transition:background .15s;display:inline-flex}.user-chip:hover{background:var(--primary-bg);color:var(--primary)}.menu-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;display:grid}.menu-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);color:inherit;box-shadow:var(--shadow);padding:28px 24px;text-decoration:none;transition:all .15s;display:block}.menu-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.menu-card h3{color:var(--text);margin-bottom:6px;font-size:17px;font-weight:600}.menu-card p{color:var(--text-secondary);font-size:13px;line-height:1.5}.menu-icon{margin-bottom:12px;font-size:32px;line-height:1}.login-shell{background:linear-gradient(135deg,#eff6ff 0%,#f8fafc 100%);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.login-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:400px;box-shadow:var(--shadow-lg);padding:36px 32px}.login-brand{text-align:center;margin-bottom:28px}.login-brand h1{color:var(--primary);letter-spacing:-.5px;font-size:24px;font-weight:700}.login-brand p{color:var(--text-secondary);margin-top:6px;font-size:13px}.login-form .form-group{margin-bottom:16px}.login-form .form-group label{margin-bottom:6px;font-size:13px;font-weight:500;display:block}.login-form .form-group input{border:1px solid var(--border);border-radius:var(--radius);width:100%;padding:10px 12px;font-family:inherit;font-size:14px}.login-form .form-group input:focus{border-color:var(--primary-light);outline:none;box-shadow:0 0 0 3px #3b82f626}.login-error{color:var(--danger);border-radius:var(--radius);background:#fef2f2;border:1px solid #fecaca;margin-bottom:16px;padding:10px 12px;font-size:13px}