Untitled

graph TD
    %% --- Style Definitions for Blueprint/HUD Theme (Light Background) ---
    classDef level1 fill:#111,stroke:#0D47A1,stroke-width:3px,color:#fff;
    classDef level2 fill:#0D47A1,stroke:#42A5F5,stroke-width:1px,color:#fff;
    classDef level3 fill:#E3F2FD,stroke:#42A5F5,stroke-width:1px,color:#000;
    linkStyle default stroke:#42A5F5,stroke-width:1px;

    %% --- Level 1 Node (Project Root) ---
    A("4.0 <br> Mechanical, Electrical & Plumbing (MEP) Works"):::level1

    %% --- Level 2 Nodes (Main Categories) ---
    B("4.1 <br> Electrical Systems")
    C("4.2 <br> HVAC & Ventilation")
    D("4.3 <br> Plumbing & Drainage")
    E("4.4 <br> Fire Safety & Suppression")
    F("4.5 <br> Smart Access & Security Systems")
    G("4.6 <br> Energy-Efficient Systems")

    %% --- Connections from Level 1 to Level 2 ---
    A --> B & C & D & E & F & G
    
    %% --- Vertically Chained Level 3 Nodes (Work Packages) ---
    B --> B1("4.1.1 Main power supply &<br>transformer connection") --> B2("4.1.2 Main switchboard (MSB) &<br>distribution boards") --> B3("4.1.3 Energy-efficient LED<br>sports lighting (indoor)") --> B4("4.1.4 Emergency lighting &<br>exit signage") --> B5("4.1.5 Smart metering &<br>sub-metering by zone") --> B6("4.1.6 Earthing/grounding &<br>lightning protection")

    C --> C1("4.2.1 Centralized chiller/VRF<br>system selection") --> C2("4.2.2 Air handling units (AHUs)<br>& ducts installation") --> C3("4.2.3 High MERV filtration &<br>air purification") --> C4("4.2.4 Demand-controlled<br>ventilation by occupancy") --> C5("4.2.5 Pool hall<br>dehumidification (B1)") --> C6("4.2.6 Climate zone control<br>(courts/gyms/studios)")

    D --> D1("4.3.1 Main water supply connection<br>& storage tanks") --> D2("4.3.2 Hot water generation<br>& recirculation") --> D3("4.3.3 Indoor plumbing<br>(fixtures, valves, mixing)") --> D4("4.3.4 Greywater recycling<br>for irrigation/flush") --> D5("4.3.5 Drainage & sewage connection<br>(backflow preventers)") --> D6("4.3.6 Roof drainage &<br>overflow control")

    E --> E1("4.4.1 Fire alarm & detection<br>(addressable)") --> E2("4.4.2 Automatic sprinklers/standpipes<br>by hazard class") --> E3("4.4.3 Fire hose reels &<br>extinguishers") --> E4("4.4.4 Emergency exit lighting<br>& wayfinding") --> E5("4.4.5 Hydrant systems &<br>fire pump room") --> E6("4.4.6 Fire stopping at<br>penetrations & compartments")

    F --> F1("4.5.1 Biometric/ID access<br>control at entries") --> F2("4.5.2 CCTV with analytics &<br>storage retention") --> F3("4.5.3 Smart card readers<br>& turnstiles") --> F4("4.5.4 Security control room &<br>monitoring consoles") --> F5("4.5.5 PA system &<br>mass notification") --> F6("4.5.6 Network infrastructure &<br>Wi-Fi coverage plan")

    G --> G1("4.6.1 Solar PV array<br>design & installation") --> G2("4.6.2 Battery energy storage<br>integration") --> G3("4.6.3 Motion/occupancy<br>sensor lighting") --> G4("4.6.4 BMS/EMS integration<br>& dashboards") --> G5("4.6.5 High-efficiency motors<br>& VFDs") --> G6("4.6.6 Energy performance measurement<br>& verification")
    
    %% --- Apply styles to all nodes ---
    class B,C,D,E,F,G level2;
    class B1,B2,B3,B4,B5,B6,C1,C2,C3,C4,C5,C6,D1,D2,D3,D4,D5,D6,E1,E2,E3,E4,E5,E6,F1,F2,F3,F4,F5,F6,G1,G2,G3,G4,G5,G6 level3;