:root{font-synthesis:none;text-rendering:optimizelegibility;font-family:Inter,Noto Sans Bengali,Segoe UI,Arial,sans-serif}html{scroll-behavior:smooth}body{min-width:320px;min-height:100vh;margin:0}button,select{font-family:inherit}*{box-sizing:border-box}button,select{font:inherit}.app{--bg:#07111f;--surface:#0e1a2b;--surface-soft:#142237;--border:#ffffff14;--text:#f7f9fc;--muted:#8fa1b8;--accent:#38bdf8;--accent-hover:#0ea5e9;background:radial-gradient(circle at 50% -10%, #38bdf81a, transparent 35%), var(--bg);min-height:100vh;color:var(--text);transition:background .3s,color .3s}.app.light{--bg:#f4f7fb;--surface:#fff;--surface-soft:#f0f4f9;--border:#0f172a1a;--text:#0f172a;--muted:#64748b;--accent:#0284c7;--accent-hover:#0369a1;background:radial-gradient(circle at 50% -10%, #0284c714, transparent 35%), var(--bg)}.header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;width:min(1180px,100% - 40px);min-height:110px;margin:0 auto;display:flex}.brand{flex-direction:column;gap:5px;display:flex}.brand-title{width:240px;height:34px;position:relative}.brand-name{letter-spacing:-.04em;white-space:nowrap;font-size:1.7rem;font-weight:800;position:absolute;top:0;left:0}.bangla-name{animation:6s infinite banglaFade}.english-name{animation:6s infinite englishFade}@keyframes banglaFade{0%,40%{opacity:1;transform:translateY(0)}48%,92%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}@keyframes englishFade{0%,40%{opacity:0;transform:translateY(5px)}48%,92%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(5px)}}.brand p{color:var(--muted);margin:0;font-size:.86rem}.header-actions{gap:10px;display:flex}.control-button{border:1px solid var(--border);background:var(--surface);height:40px;color:var(--text);cursor:pointer;border-radius:10px;transition:transform .2s,border-color .2s}.control-button:hover{border-color:var(--accent);transform:translateY(-1px)}.language-button{min-width:72px;padding:0 16px}.theme-button{width:40px;font-size:1.2rem}.main-content{width:min(1180px,100% - 40px);margin:0 auto;padding:55px 0 70px}.intro{text-align:center;margin-bottom:28px}.intro p{max-width:600px;color:var(--muted);margin:0 auto;font-size:1rem;line-height:1.6}.import-button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;margin-top:22px;padding:11px 18px;font-weight:600;transition:transform .2s,background .2s}.import-button:hover{background:var(--accent-hover);transform:translateY(-1px)}.file-message{border-radius:9px;width:fit-content;max-width:100%;margin:16px auto 0;padding:10px 14px;font-size:.85rem}.success-message{background:#22c55e1a;border:1px solid #22c55e40}.error-message{background:#ef44441a;border:1px solid #ef444440}.validation-box{text-align:left;background:#ef444414;border:1px solid #ef444440;border-radius:10px;max-width:650px;margin:16px auto 0;padding:15px 18px;font-size:.82rem}.validation-box ul{color:var(--muted);margin:10px 0 0;padding-left:20px}.validation-box li+li{margin-top:5px}.simulator{background:var(--surface);border:1px solid var(--border);border-radius:20px;grid-template-columns:minmax(0,1fr) 300px;min-height:520px;display:grid;overflow:hidden;box-shadow:0 20px 60px #0000001a}.map-area{background-image:linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);background-size:32px 32px;justify-content:center;align-items:center;min-height:520px;display:flex;position:relative}.map-placeholder{text-align:center;color:var(--muted);animation:.5s appear}.map-placeholder p{margin-top:10px}.map-icon{border:1px solid var(--border);background:var(--surface);width:55px;height:55px;color:var(--accent);border-radius:15px;place-items:center;margin:auto;font-size:1.5rem;display:grid}@keyframes appear{0%{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}.control-panel{border-left:1px solid var(--border);flex-direction:column;gap:22px;padding:25px;display:flex}.control-group{flex-direction:column;gap:8px;display:flex}.control-group label{color:var(--muted);font-size:.8rem;font-weight:600}.control-group select{border:1px solid var(--border);background:var(--surface-soft);width:100%;color:var(--text);border-radius:10px;outline:none;padding:12px}.route-card{background:var(--surface-soft);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:8px;padding:18px;display:flex}.route-label{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.75rem}.route-card strong{font-size:.95rem;line-height:1.4}.action-buttons{flex-direction:column;gap:10px;margin-top:auto;display:flex}.primary-button,.secondary-button{cursor:pointer;border-radius:10px;padding:12px 14px;font-weight:600;transition:transform .2s,opacity .2s}.primary-button{background:var(--accent);color:#fff;border:none}.primary-button:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.secondary-button{border:1px solid var(--border);color:var(--text);background:0 0}.secondary-button:hover:not(:disabled){transform:translateY(-1px)}button:disabled,select:disabled{opacity:.45;cursor:not-allowed}.footer{border-top:1px solid var(--border);width:min(1180px,100% - 40px);color:var(--muted);text-align:center;flex-direction:column;gap:7px;margin:0 auto;padding:28px 0 35px;font-size:.8rem;display:flex}.footer strong{color:var(--text)}@media (width<=800px){.header{min-height:95px}.brand-title{width:190px}.brand-name{font-size:1.4rem}.brand p{display:none}.simulator{grid-template-columns:1fr}.control-panel{border-left:none;border-top:1px solid var(--border)}.map-area{min-height:400px}}@media (width<=480px){.header,.main-content,.footer{width:min(100% - 24px,1180px)}.main-content{padding-top:35px}.brand-title{width:145px}.brand-name{font-size:1.18rem}.language-button{min-width:58px;padding:0 10px}}.building-map-wrapper{justify-content:center;align-items:center;width:100%;height:100%;min-height:520px;animation:.45s mapEnter;display:flex;position:relative}.building-map{width:100%;height:100%;min-height:500px;overflow:visible}.map-edge{stroke:var(--muted);stroke-width:3px;opacity:.48;transition:stroke .25s,stroke-width .25s,opacity .25s}.edge-cost circle{fill:var(--surface);stroke:var(--border);stroke-width:1.5px}.edge-cost text{fill:var(--text);pointer-events:none;font-size:10px;font-weight:700}.map-node{cursor:pointer}.node-circle{stroke-width:3px;transform-box:fill-box;transform-origin:50%;transition:transform .2s,fill .2s,stroke .2s}.map-node:hover .node-circle{transform:scale(1.1)}.node-room .node-circle{fill:#2563eb;stroke:#60a5fa}.node-junction .node-circle{fill:#d97706;stroke:#fbbf24}.node-exit .node-circle{fill:#059669;stroke:#34d399}.node-id{fill:#fff;pointer-events:none;font-size:11px;font-weight:800}.node-label{fill:var(--text);pointer-events:none;font-size:10px;font-weight:600}.map-legend{background:var(--surface);border:1px solid var(--border);color:var(--muted);border-radius:10px;gap:14px;padding:8px 11px;font-size:.7rem;display:flex;position:absolute;bottom:16px;left:18px}.map-legend span{align-items:center;gap:6px;display:flex}.legend-dot{border-radius:50%;width:9px;height:9px;display:inline-block}.room-dot{background:#2563eb}.junction-dot{background:#d97706}.exit-dot{background:#059669}@keyframes mapEnter{0%{opacity:0;transform:scale(.98)}to{opacity:1;transform:scale(1)}}@media (width<=800px){.building-map-wrapper{min-height:400px}.building-map{min-height:380px}.map-legend{gap:8px;bottom:10px;left:10px}}.edge-hitbox{stroke:#0000;stroke-width:18px}.edge-clickable{cursor:pointer}.hazard-clickable{cursor:crosshair}.active-route-edge{stroke:#38bdf8;stroke-width:6px;opacity:1;stroke-dasharray:12 7;animation:.8s linear infinite routeFlow}@keyframes routeFlow{to{stroke-dashoffset:-19px}}.active-route-node .node-circle{filter:drop-shadow(0 0 8px #38bdf8b3)}.selected-node .node-circle{stroke:#fff;stroke-width:5px}.blocked-edge{stroke:#ef4444;stroke-width:5px;opacity:.8;stroke-dasharray:8 6}.blocked-cost circle{fill:#7f1d1d;stroke:#ef4444}.blocked-cost text{fill:#fff;font-size:15px}.blocked-node .node-circle{fill:#7f1d1d;stroke:#ef4444;opacity:.9}.closed-exit .node-circle{fill:#7f1d1d;stroke:#ef4444}.hazard-mode-banner{z-index:5;color:#f87171;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);pointer-events:none;background:#ef444424;border:1px solid #ef444466;border-radius:20px;padding:8px 14px;font-size:.75rem;font-weight:700;position:absolute;top:16px;left:50%;transform:translate(-50%)}.hazard-editing .map-node:hover .node-circle{stroke:#ef4444;transform:scale(1.15)}.hazard-editing .edge-group:hover .map-edge{stroke:#ef4444;stroke-width:6px}.hazard-active-button{background:#ef4444}.hazard-active-button:hover:not(:disabled){background:#dc2626}.hazard-dot{background:#ef4444}