*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:#eef2f7;color:#17233b;font-size:17px}button,input,select,textarea{font-size:17px}header{background:#1f3864;color:#fff;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:10}header h1{font-size:19px;margin:0}header p{margin:2px 0 0;font-size:13px;opacity:.85}.demo-badge{background:#f59e0b;color:#111;padding:4px 8px;border-radius:20px;font-weight:700;font-size:13px}main{max-width:980px;margin:0 auto;padding:16px 12px 110px}.card{background:#fff;border-radius:14px;padding:16px;margin-bottom:14px;box-shadow:0 1px 4px rgba(0,0,0,.08)}.card h2{margin:0 0 10px;font-size:20px}.card h3{margin:14px 0 8px;font-size:17px}.muted{color:#5b6b85;font-size:14px}.warn{background:#fff3cd;border:1px solid #f0c36d;border-radius:10px;padding:10px;margin:10px 0}.ok{background:#e2efda;border:1px solid #9cc98f;border-radius:10px;padding:10px;margin:10px 0}.tiles{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tile{background:#2e75b6;color:#fff;border:0;border-radius:14px;padding:18px;text-align:left;min-height:110px}.tile b{display:block;font-size:20px}.tile span{font-size:14px;opacity:.9}.tile.green{background:#2e7d32}.tile.dark{background:#334155}nav.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}nav.tabs button{flex:1;min-width:110px;padding:12px;border:1px solid #cbd5e1;background:#fff;border-radius:12px;font-weight:600}nav.tabs button.active{background:#1f3864;color:#fff}.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}@media(max-width:600px){.grid{grid-template-columns:1fr}.tiles{grid-template-columns:1fr}}label{display:block;font-weight:600;margin:8px 0 4px;font-size:15px}input,select,textarea{width:100%;padding:12px;border:1px solid #cbd5e1;border-radius:10px;background:#fff}input[readonly]{background:#ededed;color:#334155}.btn{background:#1f3864;color:#fff;border:0;border-radius:12px;padding:14px 18px;font-weight:700;min-height:48px;cursor:pointer}.btn.secondary{background:#e2e8f0;color:#17233b}.btn.small{padding:10px 12px;min-height:42px}.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.fab{position:fixed;right:18px;bottom:18px;width:64px;height:64px;border-radius:50%;background:#f59e0b;color:#111;border:0;font-size:34px;font-weight:900;box-shadow:0 4px 14px rgba(0,0,0,.3);z-index:20}table{width:100%;border-collapse:collapse;font-size:14px}th,td{border:1px solid #e2e8f0;padding:8px;text-align:left}th{background:#dbeafe}.hidden{display:none!important}.modal{position:fixed;inset:0;background:rgba(0,0,0,.55);display:flex;align-items:flex-end;justify-content:center;z-index:30}.modal .box{background:#fff;width:100%;max-width:560px;border-radius:18px 18px 0 0;padding:18px;max-height:88vh;overflow:auto}@media print{header,.tabs,.fab,.noprint{display:none!important}main{padding:0}body{font-size:13px}}

/* --- UX fix: sticky top nav + one-card-at-a-time stepper (fields/calculations unchanged) --- */
.sticky-top{position:sticky;top:0;z-index:15;background:#1f3864;box-shadow:0 2px 8px rgba(0,0,0,.25)}
.sticky-top header{position:static;box-shadow:none}
.topnav{display:flex;gap:6px;padding:8px 12px;background:#16305a;overflow-x:auto}
.topnav button{flex:1;min-width:96px;white-space:nowrap;padding:11px 10px;border:1px solid #3b5a8a;background:#243f6b;color:#fff;border-radius:10px;font-weight:600;min-height:44px;cursor:pointer}
.topnav button.active{background:#f59e0b;color:#111;border-color:#f59e0b}
.backrow{margin-bottom:10px}
.step-card{padding:12px;border-radius:12px;margin-bottom:12px;border:1px solid #e2e8f0;border-left:6px solid #334155;scroll-margin-top:135px}
.step-card h3{margin:0 0 8px;font-size:17px}
.step-card h4{margin:10px 0 4px;font-size:15px}
.step-card label{margin:6px 0 3px}
.card-date{background:#eef2f7;border-left-color:#334155}
.card-gas{background:#fef3e8;border-left-color:#e67e22}
.card-diesel{background:#e8f1fb;border-left-color:#2e75b6}
.card-water{background:#fef9e7;border-left-color:#b7950b}
.card-totals{background:#eaf5ea;border-left-color:#2e7d32}
.card-steam{background:#dbeafe;border-left-color:#2e75b6}
.stepper-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px;font-weight:700}
.stepper-bar .toggle{font-weight:600;font-size:15px;display:flex;gap:6px;align-items:center}
.stepper-bar .toggle input{width:auto;min-height:20px}
.stepper-footer{position:sticky;bottom:0;z-index:12;display:flex;gap:8px;flex-wrap:wrap;align-items:center;background:#fff;border-top:1px solid #cbd5e1;padding:10px 0;margin-top:10px}
.stepper-footer .btn{min-height:48px}
input,select{ min-height:44px; padding:10px 12px }
main{padding-bottom:150px}
.fab{bottom:88px}
@media(max-width:600px){.topnav button{min-width:84px;padding:10px 6px;font-size:15px}.step-card{padding:10px}}

/* --- Plant Overview: Tulip-style key numbers, read-only --- */
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:12px}
.kpi{background:#fff;border:1px solid #e2e8f0;border-left:6px solid #334155;border-radius:12px;padding:12px}
.kpi .k-label{font-size:13px;color:#5b6b85;font-weight:700}
.kpi .k-value{font-size:28px;font-weight:800;line-height:1.15;margin:4px 0}
.kpi .k-sub{font-size:13px;color:#5b6b85}
.kpi-gas{border-left-color:#e67e22}.kpi-water{border-left-color:#b7950b}.kpi-total{border-left-color:#2e7d32}.kpi-steam{border-left-color:#2e75b6}
.dot{display:inline-block;width:12px;height:12px;border-radius:50%;margin-right:6px;vertical-align:middle}
.dot.green{background:#2e7d32}.dot.amber{background:#f59e0b}.dot.grey{background:#94a3b8}.dot.red{background:#c62828}
.boiler-kpi{background:#fff;border:1px solid #e2e8f0;border-left:6px solid #334155;border-radius:12px;padding:12px;margin-bottom:10px}
.boiler-kpi h4{margin:0 0 6px;font-size:17px}
.boiler-kpi .k-value{font-size:20px;font-weight:800}
@media(max-width:700px){.kpi-grid{grid-template-columns:repeat(2,1fr)}.kpi .k-value{font-size:24px}}