/* --- COMBINED CSS FOR CHATBOT AND 3D VIEW --- */
        :root {
            --primary-color: #00796B;
            --primary-light: #E0F2F1;
            --background-color: #F5F7FA;
            --chat-panel-bg: #FFFFFF;
            --user-bubble-bg: #E3F2FD;
            --bot-bubble-bg: #E8F5E9;
            --text-primary: #212121;
            --text-secondary: #757575;
            --border-color: #E0E0E0;
            --marker-color: #D32F2F;
        }

        body.dark-mode {
            --primary-color: #4DB6AC;
            --primary-light: #26A69A;
            --background-color: #121212;
            --chat-panel-bg: #1E1E1E;
            --user-bubble-bg: #2C3E50;
            --bot-bubble-bg: #34495E;
            --text-primary: #EAEAEA;
            --text-secondary: #BDBDBD;
            --border-color: #424242;
            --marker-color: #EF5350;
        }

        html { box-sizing: border-box; }
        *, *:before, *:after { box-sizing: inherit; }
        body {
            font-family: 'Inter', sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--background-color);
            display: flex;
            flex-direction: row;
            height: 100vh;
            overflow: hidden;
            transition: background-color 0.3s ease;
        }
        .chat-container {
            width: 35%;
            max-width: 450px;
            min-width: 320px;
            height: 100vh;
            background-color: var(--chat-panel-bg);
            display: flex;
            flex-direction: column;
            box-shadow: 0 0 25px rgba(0,0,0,0.05);
            border-right: 1px solid var(--border-color);
            position: relative;
            transition: min-width 0.3s ease-in-out, width 0.3s ease-in-out, padding 0.3s ease-in-out, background-color 0.3s ease, border-color 0.3s ease;
            z-index: 10;
        }

        .map-wrapper {
            flex-grow: 1;
            height: 100vh;
            position: relative;
        }
        
        body.tour-active .map-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: 100;
        }

        #map, #tour-canvas {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
            transition: opacity 0.5s ease;
        }

        #tour-canvas {
            z-index: 2;
            opacity: 0;
            pointer-events: none;
        }

        .tour-active #tour-canvas {
            opacity: 1;
            pointer-events: auto;
        }

        .tour-active #map {
            opacity: 0;
            pointer-events: none;
        }

        .chat-container.collapsed {
            width: 0;
            min-width: 0;
            padding: 0;
            border-right: none;
        }
        .chat-container.collapsed > *:not(#collapse-btn):not(#theme-toggle-btn) { visibility: hidden; }
        
        body.tour-active #collapse-btn {
            visibility: visible !important;
            z-index: 102; 
        }

        .chat-container.collapsed #collapse-btn, .chat-container.collapsed #theme-toggle-btn { visibility: visible; }
        .chat-container.collapsed #theme-toggle-btn {
             left: 52px;
        }

        .chat-header { padding: 1rem 1.5rem; background-color: var(--chat-panel-bg); border-bottom: 1px solid var(--border-color); flex-shrink: 0; transition: background-color 0.3s ease, border-color 0.3s ease; }
        .title-container { display: flex; align-items: baseline; gap: 0.5rem; }
        .main-title { margin: 0; font-family: 'Poppins', sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--primary-color); transition: color 0.3s ease; }
        
        #collapse-btn { background: var(--chat-panel-bg); border: 1px solid var(--border-color); border-radius: 50%; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.3s ease-in-out; position: absolute; right: 10px; top: 20px; z-index: 10; }
        #collapse-btn:hover { background-color: #f1f1f1; transform: scale(1.1); }
        body.dark-mode #collapse-btn:hover { background-color: #333; }
        #collapse-btn svg { width: 20px; height: 20px; color: var(--text-secondary); transition: transform 0.3s ease-in-out, color 0.3s ease; }
        .chat-container.collapsed #collapse-btn { right: auto; left: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        .chat-container.collapsed #collapse-btn svg { transform: rotate(180deg); }
#theme-toggle-btn { background: var(--chat-panel-bg); border: 1px solid var(--border-color); border-radius: 50%; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.3s ease-in-out; position: absolute; right: 52px; top: 20px; z-index: 10; color: var(--text-secondary); }
#theme-toggle-btn:hover { background-color: #f1f1f1; transform: scale(1.1); }
body.dark-mode #theme-toggle-btn:hover { background-color: #333; }
#theme-toggle-btn svg { width: 20px; height: 20px; }
        body.dark-mode .sun-icon { display: none; }
        body:not(.dark-mode) .moon-icon { display: none; }
        .chat-container.collapsed #theme-toggle-btn { visibility: hidden; }

        .messages { flex: 1; padding: 1.5rem; overflow-y: auto; background-color: var(--background-color); transition: background-color 0.3s ease; }
        #messages-container { display: flex; flex-direction: column; gap: 1.25rem; }
        .message-wrapper { display: flex; flex-direction: column; max-width: 90%; position: relative; }
        .message-wrapper.user { align-self: flex-end; align-items: flex-end; }
        .message-wrapper.bot { align-self: flex-start; align-items: flex-start; }
        .message-sender { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); margin: 0 0 0.25rem 0; padding: 0 0.5rem; transition: color 0.3s ease; }
        .message-bubble { line-height: 1.5; padding: 0.75rem 1rem; border-radius: 1rem; width: fit-content; transition: background-color 0.3s ease; }
        .message-bubble.bot { background-color: var(--bot-bubble-bg); border-top-left-radius: 0; }
        .message-bubble.user { background-color: var(--user-bubble-bg); border-top-right-radius: 0; }
        .message-text { font-size: 1rem; font-weight: 400; color: var(--text-primary); margin: 0; transition: color 0.3s ease; }
        .message-controls { display: flex; align-items: center; gap: 4px; margin-top: 4px; margin-left: 4px; }
        .speaker-btn, .stop-btn { background: none; border: none; cursor: pointer; padding: 4px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); opacity: 0.6; transition: opacity 0.2s, color 0.2s; }
        .speaker-btn:hover, .stop-btn:hover { opacity: 1; color: var(--primary-color); }
        .speaker-btn svg, .stop-btn svg { width: 16px; height: 16px; }
        .input-area { padding: 1rem 1.5rem; background-color: var(--chat-panel-bg); border-top: 1px solid var(--border-color); display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; transition: background-color 0.3s ease, border-color 0.3s ease; }
        #userInput { flex-grow: 1; flex-shrink: 1; min-width: 50px; padding: 0.75rem 1rem; border: 1px solid var(--border-color); border-radius: 9999px; transition: box-shadow 0.2s, border-color 0.3s, background-color 0.3s, color 0.3s; font-size: 1rem; background-color: var(--background-color); color: var(--text-primary); }
        #userInput:focus { outline: none; box-shadow: 0 0 0 3px var(--primary-light); border-color: var(--primary-color); }
        .send-button, #mic-btn, #gmaps-btn { flex-shrink: 0; width: 48px; height: 48px; color: white; border-radius: 50%; border: none; cursor: pointer; transition: background-color 0.3s, box-shadow 0.3s; display: flex; align-items: center; justify-content: center; }
        .send-button { background-color: var(--primary-color); }
        .send-button:hover { background-color: #004D40; }
        .send-button svg { width: 24px; height: 24px; }
        #mic-btn { background-color: #8D6E63; }
        #mic-btn:hover { background-color: #6D4C41; }
        #mic-btn.listening { background-color: #D32F2F; animation: pulse 1.5s infinite; box-shadow: 0 0 0 0 rgba(211, 47, 47, 0.7); }
        @keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(211, 47, 47, 0.7); } 70% { box-shadow: 0 0 0 10px rgba(211, 47, 47, 0); } 100% { box-shadow: 0 0 0 0 rgba(211, 47, 47, 0); } }
        #gmaps-btn { background-color: #fff; border: 1px solid var(--border-color); color: #EA4335; text-decoration: none; }
        #gmaps-btn:hover { background-color: #f1f1f1; }
        .thinking-bubble::after { content: '...'; display: inline-block; animation: thinking 1.5s infinite; }
        @keyframes thinking { 0% { content: '.'; } 33% { content: '..'; } 66% { content: '...'; } 100% { content: '.'; } }

        .hotspot { display: block; position: relative; min-width: 12px; min-height: 12px; padding: 0; box-sizing: border-box; border-radius: 50%; border-width: 2px; border-color: #FFFFFF; background-color: rgb(0, 0, 0); cursor: pointer; }
        .tour-label .hotspot { cursor: default; }
        .hotspot-annotation { position: absolute; background-color: #ffffff; border: 1px solid #000000; color: #000000; padding: 4px 8px; font-size: 10px; width: max-content; transform: translateY(-120%); }
        .marker { display: none; width: 40px; height: 40px; color: var(--marker-color); position: absolute; transform: translateY(-100%); pointer-events: none; }

        #tour-btn {
            position: absolute;
            bottom: 20px;
            right: 20px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 24px; /* Slightly smaller radius */
            width: auto;
            height: 60px; /* Smaller height */
            padding: 0 20px; /* Smaller padding */
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px; /* Smaller gap */
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            z-index: 101;
            font-size: 0.9rem; /* Smaller font */
            font-weight: 600;
        }
        #tour-btn:hover { transform: scale(1.05); background-color: #004D40; }
        #tour-btn svg { width: 20px; height: 20px; } /* Smaller icon */
        .tour-active #tour-btn { background-color: #D32F2F; }
        .tour-active #tour-btn:hover { background-color: #B71C1C; }
        .tour-active .start-tour-content { display: none; }
        body:not(.tour-active) .end-tour-content { display: none; }

        #loader-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: rgba(0, 0, 0, 0.8);
            color: white;
            font-family: sans-serif;
            font-size: 1.5em;
            z-index: 200;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        #loader-container.visible { opacity: 1; pointer-events: auto; }

/* --- RESPONSIVE DESIGN --- */

/* --- RESPONSIVE DESIGN (Mobile First Layout) --- */

/* =================================
   Tablet & Small Laptop Breakpoint
   ================================= */
@media (max-width: 1024px) {
    .chat-container {
        width: 40%;
        max-width: 400px;
    }
}


/* =================================
   Main Mobile Breakpoint (Chat on Top)
   ================================= */
@media (max-width: 768px) {
    body {
        flex-direction: column;
        overflow-y: auto;
        height: 100vh; /* Ensure body takes full height */
    }

    /* 1. Chat panel is on top */
    .chat-container {
        width: 100%;
        max-width: none;
        height: 60vh;
        order: 1; /* Appears first */
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        transition: height 0.3s ease-in-out;
    }

    /* 2. Map wrapper is at the bottom */
    .map-wrapper {
        width: 100%;
        height: 40vh; /* Takes remaining space */
        order: 2; /* Appears second */
    }

    /* Position header buttons */
    #collapse-btn, #theme-toggle-btn {
        top: 10px;
    }
    #collapse-btn { right: 10px; }
    #theme-toggle-btn { right: 52px; }

    /* Arrow points DOWN to collapse the top panel */
    #collapse-btn svg {
        transform: rotate(270deg);
    }
    
/* --- Mobile Collapsed State --- */
.chat-container.collapsed {
    height: 50px; /* Shrinks to a thin header bar */
    min-height: 50px;
    overflow: hidden;
    
    /* FIX: Override the desktop 'width: 0' rule to prevent disappearing */
    width: 100%;
    min-width: unset; 
}

    /* Hide the scrolling content */
    .chat-container.collapsed .messages,
    .chat-container.collapsed .input-area {
        display: none;
    }
    
    /* Ensure header and buttons are visible and aligned */
    .chat-container.collapsed .chat-header {
        height: 100%;
        display: flex;
        align-items: center;
        padding-top: 0;
        padding-bottom: 0;
        border-bottom: none;
    }

    .chat-container.collapsed #collapse-btn {
        right: 10px;
        left: auto;
        top: 10px;
        box-shadow: none;
    }

    /* Arrow points UP to expand the panel from the top */
    .chat-container.collapsed #collapse-btn svg {
        transform: rotate(90deg);
    }
    
    /* Ensure theme toggle remains visible */
    .chat-container.collapsed #theme-toggle-btn {
        visibility: visible;
        right: 52px;
        left: auto;
    }
}


/* =================================
   Small Mobile Fine-Tuning
   ================================= */
@media (max-width: 480px) {
    .main-title {
        font-size: 1.3rem;
    }

    .input-area {
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    #userInput {
        padding: 0.6rem 0.9rem;
        font-size: 0.9rem;
    }

    .send-button, #mic-btn, #gmaps-btn {
        width: 40px;
        height: 40px;
    }

    .send-button svg {
        width: 20px;
        height: 20px;
    }
}