*{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f172a;--surface:#1e293b;--surface2:#334155;--border:#475569;--text:#f1f5f9;--text-dim:#94a3b8;--accent:#38bdf8;--accent2:#818cf8;--green:#4ade80;--orange:#fb923c;--red:#f87171;--yellow:#fbbf24}body{background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.6}.app{max-width:1200px;margin:0 auto;padding:20px}header{text-align:center;border-bottom:1px solid var(--border);margin-bottom:30px;padding:30px 0}header h1{background:linear-gradient(135deg, var(--accent), var(--accent2));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:8px;font-size:2rem}header p{color:var(--text-dim);font-size:1.1rem}.tabs{flex-wrap:wrap;gap:4px;margin-bottom:24px;display:flex}.tab{background:var(--surface);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;border-radius:8px 8px 0 0;padding:10px 20px;font-size:.95rem;transition:all .2s}.tab:hover{background:var(--surface2);color:var(--text)}.tab.active{background:var(--accent);color:var(--bg);border-color:var(--accent);font-weight:600}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;margin-bottom:20px;padding:24px}.card h2{color:var(--accent);margin-bottom:16px;font-size:1.3rem}.card h3{color:var(--accent2);margin:16px 0 8px;font-size:1.1rem}.timeline{padding:20px 0;position:relative}.timeline-bar{border-radius:8px;align-items:stretch;height:60px;margin:10px 0;display:flex;overflow:hidden}.timeline-segment{color:var(--bg);text-align:center;justify-content:center;align-items:center;min-width:40px;padding:4px 8px;font-size:.8rem;font-weight:600;line-height:1.2;display:flex;position:relative}.timeline-segment.prep{background:var(--accent)}.timeline-segment.driving{background:var(--green)}.timeline-segment.rest{background:var(--yellow)}.timeline-segment.rear{background:var(--orange)}.time-labels{color:var(--text-dim);justify-content:space-between;margin-top:4px;font-size:.85rem;display:flex}.station-map{align-items:center;gap:0;padding:20px 0;display:flex;overflow-x:auto}.station-node{cursor:pointer;flex-direction:column;align-items:center;min-width:80px;transition:transform .2s;display:flex}.station-node:hover{transform:scale(1.1)}.station-dot{background:var(--accent);border:3px solid var(--surface);z-index:2;border-radius:50%;width:20px;height:20px;position:relative}.station-dot.base{background:var(--green);border:3px solid var(--green);width:28px;height:28px;box-shadow:0 0 12px #4ade8080}.station-name{margin-top:6px;font-size:.85rem;font-weight:500}.station-mile{color:var(--text-dim);font-size:.75rem}.station-link{background:var(--border);flex:1;min-width:20px;height:3px;position:relative;top:-4px}.trip-card{background:var(--surface2);cursor:pointer;border:2px solid #0000;border-radius:8px;align-items:center;gap:12px;margin-bottom:8px;padding:12px 16px;transition:all .2s;display:flex}.trip-card:hover,.trip-card.selected{border-color:var(--accent);transform:translate(4px)}.trip-card .trip-no{color:var(--accent);min-width:70px;font-size:1.1rem;font-weight:700}.trip-card .trip-route{flex:1;font-size:.9rem}.trip-card .trip-time{color:var(--text-dim);font-size:.85rem}.shift-builder{flex-wrap:wrap;gap:20px;display:flex}.shift-pool,.shift-workspace{flex:1;min-width:300px}.shift-drop-zone{border:2px dashed var(--border);border-radius:12px;min-height:200px;padding:16px;transition:border-color .2s}.shift-drop-zone.valid{border-color:var(--green);background:#4ade800d}.shift-drop-zone.invalid{border-color:var(--red);background:#f871710d}.constraint-list{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px;margin-top:16px;display:grid}.constraint-item{background:var(--surface2);border-radius:8px;align-items:center;gap:10px;padding:10px 14px;font-size:.9rem;display:flex}.constraint-icon{text-align:center;min-width:28px;font-size:1.2rem}.constraint-bar{background:var(--border);border-radius:3px;flex:1;height:6px;overflow:hidden}.constraint-fill{border-radius:3px;height:100%;transition:width .3s}.constraint-fill.ok{background:var(--green)}.constraint-fill.warn{background:var(--yellow)}.constraint-fill.fail{background:var(--red)}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-top:16px;display:grid}.stat-box{text-align:center;background:var(--surface2);border-radius:10px;padding:16px}.stat-value{color:var(--accent);font-size:1.5rem;font-weight:700}.stat-label{color:var(--text-dim);margin-top:4px;font-size:.8rem}.btn{cursor:pointer;border:none;border-radius:8px;padding:8px 18px;font-size:.9rem;font-weight:600;transition:all .2s}.btn-primary{background:var(--accent);color:var(--bg)}.btn-primary:hover{opacity:.9;transform:translateY(-1px)}.btn-danger{background:var(--red);color:#fff}.btn-success{background:var(--green);color:var(--bg)}.btn-group{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.cover-grid{grid-template-columns:repeat(auto-fill,minmax(60px,1fr));gap:4px;margin-top:12px;display:grid}.cover-cell{text-align:center;border-radius:6px;padding:8px 4px;font-size:.75rem;font-weight:600}.cover-cell.covered{color:var(--green);background:#4ade8033}.cover-cell.uncovered{color:var(--red);background:#f8717133}.example-box{background:var(--surface2);border-left:4px solid var(--accent);border-radius:10px;margin:16px 0;padding:20px}.formula{background:var(--bg);border-radius:8px;margin:8px 0;padding:12px 16px;font-family:Courier New,monospace;font-size:.95rem;overflow-x:auto}.highlight{color:var(--yellow);font-weight:700}.highlight-green{color:var(--green);font-weight:700}.highlight-red{color:var(--red);font-weight:700}.highlight-blue{color:var(--accent);font-weight:700}.comparison-table{border-collapse:collapse;width:100%;margin-top:12px}.comparison-table th,.comparison-table td{border:1px solid var(--border);text-align:left;padding:10px 14px;font-size:.9rem}.comparison-table th{background:var(--surface2);color:var(--accent)}.comparison-table tr:hover{background:#38bdf80d}@media (width<=768px){.shift-builder{flex-direction:column}.tabs{gap:2px}.tab{padding:8px 12px;font-size:.85rem}header h1{font-size:1.5rem}}.arrow-right{color:var(--accent);margin:0 4px;font-size:1.5rem}.step-number{background:var(--accent);width:28px;height:28px;color:var(--bg);border-radius:50%;justify-content:center;align-items:center;margin-right:8px;font-size:.85rem;font-weight:700;display:inline-flex}.info-banner{color:var(--accent);background:#38bdf81a;border:1px solid #38bdf84d;border-radius:8px;margin:12px 0;padding:14px 18px;font-size:.9rem}.success-banner{color:var(--green);background:#4ade801a;border:1px solid #4ade804d;border-radius:8px;margin:12px 0;padding:14px 18px;font-size:.9rem}.error-banner{color:var(--red);background:#f871711a;border:1px solid #f871714d;border-radius:8px;margin:12px 0;padding:14px 18px;font-size:.9rem}