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<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Chest X-ray Report Generation Application Via VLM and LLM</title>
    <!-- Google Font: Roboto -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap" rel="stylesheet">
    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <!-- Font Awesome for Icons -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.0/css/all.min.css">
    <style>
        :root {
            /* --- Light Mode Color Palette & Design Tokens --- */
            --lm-primary-color: #0d6efd; /* Medical Blue */
            --lm-primary-color-rgb: 13, 110, 253;
            --lm-bg-primary: linear-gradient(135deg, #eef2f7 0%, #f0f5ff 100%);
            --lm-bg-container: rgba(255, 255, 255, 0.85);
            --lm-bg-content: #fdfdff; /* chat container, report box, form */
            --lm-bg-input: #ffffff;
            --lm-bg-user-msg: #dbeafe;
            --lm-bg-bot-msg: #e9ecef;
            --lm-bg-suggestion: #f0f2f5;
            --lm-bg-suggestion-hover: #e2e6ea;
            --lm-text-primary: #333;
            --lm-text-secondary: #495057; /* dark-gray */
            --lm-text-muted: #6c757d;
            --lm-text-report: #212529;
            --lm-border-primary: var(--lm-primary-color); /* Container border */
            --lm-border-secondary: #dee2e6; /* medium-gray */
            --lm-border-suggestion: #d5d9de;
            --lm-border-suggestion-hover: #c8ced3;
            --lm-shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.08);
            --lm-shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.12);
            --lm-shadow-inset: inset 0 1px 4px rgba(0,0,0,0.04);
            --lm-highlight-finding: #dc3545; /* Red */
            --lm-highlight-device: var(--lm-primary-color); /* Blue */
            --lm-scrollbar-thumb: var(--lm-primary-color);
            --lm-scrollbar-track: #f0f0f0;

            /* --- Dark Mode Color Palette & Design Tokens --- */
            --dm-primary-color: #e53935; /* Vivid Red */
            --dm-primary-color-rgb: 229, 57, 53;
            --dm-bg-primary: #1a1a1a; /* Very Dark Gray/Near Black */
            --dm-bg-container: rgba(33, 33, 33, 0.9); /* Darker container with slight transparency */
            --dm-bg-content: #2d2d2d; /* Chat container, report box, form */
            --dm-bg-input: #3a3a3a;
            --dm-bg-user-msg: #5e2828; /* Dark red background for user */
            --dm-bg-bot-msg: #3f3f3f; /* Dark gray for bot */
            --dm-bg-suggestion: #4a4a4a;
            --dm-bg-suggestion-hover: #5a5a5a;
            --dm-text-primary: #f5f5f5; /* Off-white */
            --dm-text-secondary: #bdbdbd; /* Lighter Gray */
            --dm-text-muted: #9e9e9e;
            --dm-text-report: #f5f5f5;
            --dm-text-input-placeholder: #a0a0a0;
            --dm-border-primary: var(--dm-primary-color); /* Container border */
            --dm-border-secondary: #555555; /* Darker Gray Border */
            --dm-border-suggestion: #666666;
            --dm-border-suggestion-hover: #777777;
            --dm-shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.4);
            --dm-shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.5);
            --dm-shadow-inset: inset 0 1px 4px rgba(0,0,0,0.2);
            --dm-highlight-finding: #ff7961; /* Lighter Red for contrast */
            --dm-highlight-device: #6ec6ff; /* Lighter Blue for contrast */
            --dm-scrollbar-thumb: var(--dm-primary-color);
            --dm-scrollbar-track: #424242;

            /* --- Universal Tokens --- */
            --border-radius-sm: 6px;
            --border-radius-md: 8px;
            --border-radius-lg: 12px;
            --transition-speed: 0.3s; /* Slightly faster transition */
            --transition-easing: ease; /* Use standard ease */

            /* --- Apply Light Mode by Default --- */
            --primary-color: var(--lm-primary-color);
            --primary-color-rgb: var(--lm-primary-color-rgb);
            --bg-primary: var(--lm-bg-primary);
            --bg-container: var(--lm-bg-container);
            --bg-content: var(--lm-bg-content);
            --bg-input: var(--lm-bg-input);
            --bg-user-msg: var(--lm-bg-user-msg);
            --bg-bot-msg: var(--lm-bg-bot-msg);
            --bg-suggestion: var(--lm-bg-suggestion);
            --bg-suggestion-hover: var(--lm-bg-suggestion-hover);
            --text-primary: var(--lm-text-primary);
            --text-secondary: var(--lm-text-secondary);
            --text-muted: var(--lm-text-muted);
            --text-report: var(--lm-text-report);
            --text-input-placeholder: inherit; /* Use default */
            --border-primary: var(--lm-border-primary);
            --border-secondary: var(--lm-border-secondary);
            --border-suggestion: var(--lm-border-suggestion);
            --border-suggestion-hover: var(--lm-border-suggestion-hover);
            --shadow-soft: var(--lm-shadow-soft);
            --shadow-hover: var(--lm-shadow-hover);
            --shadow-inset: var(--lm-shadow-inset);
            --highlight-finding-color: var(--lm-highlight-finding);
            --highlight-device-color: var(--lm-highlight-device);
            --scrollbar-thumb: var(--lm-scrollbar-thumb);
            --scrollbar-track: var(--lm-scrollbar-track);
        }

        /* --- Apply Dark Mode Variables --- */
        body.dark-mode {
            --primary-color: var(--dm-primary-color);
            --primary-color-rgb: var(--dm-primary-color-rgb);
            --bg-primary: var(--dm-bg-primary);
            --bg-container: var(--dm-bg-container);
            --bg-content: var(--dm-bg-content);
            --bg-input: var(--dm-bg-input);
            --bg-user-msg: var(--dm-bg-user-msg);
            --bg-bot-msg: var(--dm-bg-bot-msg);
            --bg-suggestion: var(--dm-bg-suggestion);
            --bg-suggestion-hover: var(--dm-bg-suggestion-hover);
            --text-primary: var(--dm-text-primary);
            --text-secondary: var(--dm-text-secondary);
            --text-muted: var(--dm-text-muted);
            --text-report: var(--dm-text-report);
            --text-input-placeholder: var(--dm-text-input-placeholder);
            --border-primary: var(--dm-border-primary);
            --border-secondary: var(--dm-border-secondary);
            --border-suggestion: var(--dm-border-suggestion);
            --border-suggestion-hover: var(--dm-border-suggestion-hover);
            --shadow-soft: var(--dm-shadow-soft);
            --shadow-hover: var(--dm-shadow-hover);
            --shadow-inset: var(--dm-shadow-inset);
            --highlight-finding-color: var(--dm-highlight-finding);
            --highlight-device-color: var(--dm-highlight-device);
            --scrollbar-thumb: var(--dm-scrollbar-thumb);
            --scrollbar-track: var(--dm-scrollbar-track);
        }

        /* --- General Body & Container Styling --- */
        body {
            padding-top: 20px;
            padding-bottom: 30px;
            background: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
            overflow-x: hidden;
            transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing);
        }

        .container-fluid {
            max-width: 1400px;
            background-color: var(--bg-container);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            padding: 35px;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--shadow-soft);
            border: 3px solid var(--border-primary);
            transition: background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), box-shadow var(--transition-speed) var(--transition-easing);
        }

        /* Dark Mode Toggle Button Style */
        #darkModeToggle {
            border: 1px solid var(--border-secondary); /* Use secondary border */
            color: var(--text-secondary);
            background-color: transparent; /* Start transparent */
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0;
            border-radius: 50%;
            transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), transform 0.2s ease;
        }
        #darkModeToggle:hover {
            background-color: rgba(var(--primary-color-rgb), 0.1);
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: scale(1.05);
        }
         body.dark-mode #darkModeToggle {
             border-color: var(--dm-border-secondary); /* Dark mode border */
             color: var(--dm-text-secondary); /* Dark mode text */
             background-color: #444; /* Slightly lighter dark */
        }
         body.dark-mode #darkModeToggle:hover {
             background-color: #555;
             border-color: var(--dm-primary-color);
             color: var(--dm-primary-color);
             transform: scale(1.05);
        }

        h1 {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 0 !important; /* Removed margin as it's handled by the wrapper now */
            font-size: 2.1rem;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.05);
            transition: color var(--transition-speed) var(--transition-easing);
        }
        body.dark-mode h1 {
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
        }

        h2 {
            font-size: 1.5rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--primary-color);
            display: inline-block;
            transition: color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
        }

        /* --- Main Layout --- */
        .main-row {
            margin-top: 30px;
        }

        /* --- Chat Interface Section (Left Column) --- */
        #chat-column {
            border-right: 1px solid var(--border-secondary);
            padding-right: 35px;
            display: flex;
            flex-direction: column;
            height: calc(85vh - 110px);
            min-height: 500px;
            transition: opacity 0.5s ease, filter 0.5s ease, border-color var(--transition-speed) var(--transition-easing);
        }
        #chat-container {
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            background-color: var(--bg-content);
            border: 1px solid var(--border-secondary);
            border-radius: var(--border-radius-md);
            padding: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-inset);
             transition: background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
        }
        #chat-column.disabled {
            opacity: 0.5;
            filter: grayscale(50%);
            pointer-events: none;
        }
        body.dark-mode #chat-column.disabled {
             filter: grayscale(70%); /* Increase grayscale for dark */
        }
        #chat-column.disabled #chat-placeholder { display: block; }
        #chat-placeholder {
             display: none;
             text-align: center; padding: 60px 15px;
             color: var(--text-muted); font-style: italic; font-size: 0.9rem;
             align-self: center; margin-top: auto; margin-bottom: auto;
        }
        #chat-messages {
            flex-grow: 1; overflow-y: auto; margin-bottom: 15px; padding-right: 10px;
            scrollbar-width: thin;
            scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
        }
        #chat-messages::-webkit-scrollbar { width: 6px; }
        #chat-messages::-webkit-scrollbar-track { background: var(--scrollbar-track); border-radius: 3px;}
        #chat-messages::-webkit-scrollbar-thumb { background-color: var(--scrollbar-thumb); border-radius: 3px; border: 1px solid var(--scrollbar-track);}

        .chat-message {
            margin-bottom: 15px; padding: 12px 18px;
            border-radius: var(--border-radius-lg); max-width: 85%;
            word-wrap: break-word; line-height: 1.55;
            box-shadow: 0 2px 5px rgba(0,0,0,0.06);
            opacity: 0;
            transform: translateY(10px);
            animation: fadeSlideIn 0.4s ease forwards;
            color: var(--text-primary); /* Default text color for messages */
            transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing);
        }
         @keyframes fadeSlideIn { to { opacity: 1; transform: translateY(0); } }

        .user-message {
            background-color: var(--bg-user-msg); margin-left: auto;
            border-bottom-right-radius: var(--border-radius-sm); text-align: right;
        }
        .bot-message {
            background-color: var(--bg-bot-msg); margin-right: auto;
            border-bottom-left-radius: var(--border-radius-sm); text-align: left;
        }
        .bot-message.thinking {
             font-style: italic; color: var(--text-muted); display: flex; align-items: center;
        }
        .bot-message.thinking::before {
            content: ''; display: inline-block; width: 16px; height: 16px;
            border: 2px solid var(--primary-color); border-top-color: transparent;
            border-radius: 50%; animation: spin 1s linear infinite; margin-right: 8px;
        }
        @keyframes spin { to { transform: rotate(360deg); } }
        body.dark-mode .chat-message { /* Ensure text is light in dark mode */
            color: var(--dm-text-primary);
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
        }


        #chat-form { display: flex; margin-top: auto; gap: 10px; }
        #chat-input {
            flex-grow: 1; border-radius: 25px; padding: 10px 18px;
            border: 1px solid var(--border-secondary);
            background-color: var(--bg-input);
            color: var(--text-primary);
            transition: box-shadow var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing);
        }
        #chat-input:focus {
             box-shadow: 0 0 0 0.2rem rgba(var(--primary-color-rgb), 0.25);
             border-color: var(--primary-color);
        }
        #chat-input::placeholder {
             color: var(--text-input-placeholder);
             opacity: 1;
        }
        body.dark-mode #chat-input {
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.3);
        }
        body.dark-mode #chat-input:focus {
            background-color: #4f4f4f;
        }

        #send-button {
            border-radius: 50%; width: 45px; height: 45px; padding: 0;
            display: flex; align-items: center; justify-content: center; flex-shrink: 0;
            transition: background-color var(--transition-speed) var(--transition-easing), transform var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), filter var(--transition-speed) var(--transition-easing);
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
        }
        #send-button:hover {
            transform: scale(1.1);
            filter: brightness(115%); /* Use brightness for hover */
             /* Ensure base color doesn't change on hover */
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        #send-button svg { width: 20px; height: 20px; fill: white; }


        #example-questions {
            margin-top: 12px;
            padding-top: 10px;
            border-top: 1px dashed var(--border-secondary);
            text-align: left;
            transition: border-color var(--transition-speed) var(--transition-easing);
        }
        #example-questions small {
            display: block;
            margin-bottom: 8px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            font-weight: 500;
            transition: color var(--transition-speed) var(--transition-easing);
        }
        .suggestion-btn {
            background-color: var(--bg-suggestion);
            border: 1px solid var(--border-suggestion);
            color: var(--primary-color);
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: 15px;
            margin-right: 6px;
            margin-bottom: 6px;
            cursor: pointer;
            transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, filter 0.2s ease;
            text-decoration: none;
            display: inline-block;
        }
        .suggestion-btn:hover {
            background-color: var(--bg-suggestion-hover);
            border-color: var(--border-suggestion-hover);
            filter: brightness(110%);
            /* Keep text color same unless specific dark mode override */
            color: var(--primary-color);
        }
         body.dark-mode .suggestion-btn {
             color: var(--dm-text-primary); /* Make text light */
             background-color: var(--dm-bg-suggestion);
             border-color: var(--dm-border-suggestion);
         }
         body.dark-mode .suggestion-btn:hover {
             color: var(--dm-primary-color); /* Red hover text */
             background-color: var(--dm-bg-suggestion-hover);
             border-color: var(--dm-border-suggestion-hover);
             filter: brightness(115%);
         }


        /* --- Content Section (Right Column) --- */
        #content-column {
            padding-left: 35px;
            max-height: calc(85vh - 110px);
            overflow-y: auto; scrollbar-width: thin;
            scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
            position: relative;
        }
        #content-column::-webkit-scrollbar { width: 6px; }
        #content-column::-webkit-scrollbar-track { background: var(--scrollbar-track); border-radius: 3px;}
        #content-column::-webkit-scrollbar-thumb { background-color: var(--scrollbar-thumb); border-radius: 3px; border: 1px solid var(--scrollbar-track);}

        /* --- Upload Form Styling & Animation --- */
        #form-wrapper {
            transition: opacity var(--transition-speed) var(--transition-easing),
                        transform var(--transition-speed) var(--transition-easing),
                        max-height 0.6s var(--transition-easing),
                        margin-bottom var(--transition-speed) var(--transition-easing),
                        padding-top var(--transition-speed) var(--transition-easing),
                        padding-bottom var(--transition-speed) var(--transition-easing),
                        border var(--transition-speed) var(--transition-easing);
            overflow: hidden; max-height: 800px; transform: translateY(0);
            opacity: 1; margin-bottom: 30px; padding-top: 0; padding-bottom: 0; border: none;
        }
        #upload-form {
            padding: 30px;
            border: 1px solid var(--border-secondary);
            border-radius: var(--border-radius-md);
            background-color: var(--bg-content); margin-bottom: 0;
             transition: background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
        }
        .form-label {
            font-weight: 500; margin-bottom: 0.6rem;
            color: var(--text-secondary);
            transition: color var(--transition-speed) var(--transition-easing);
        }
        .form-control, .form-select {
             background-color: var(--bg-input);
             color: var(--text-primary);
             border: 1px solid var(--border-secondary);
             transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), box-shadow var(--transition-speed) var(--transition-easing);
        }
        .form-control::placeholder {
             color: var(--text-input-placeholder);
             opacity: 1;
        }
        .form-control:focus, .form-select:focus {
             background-color: var(--bg-input);
             color: var(--text-primary);
             border-color: var(--primary-color);
             box-shadow: 0 0 0 0.2rem rgba(var(--primary-color-rgb), 0.25);
        }
        body.dark-mode .form-control, body.dark-mode .form-select {
             box-shadow: inset 0 1px 3px rgba(0,0,0,0.3);
        }
         body.dark-mode .form-select {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23f5f5f5' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
         }
         body.dark-mode .form-control:focus, body.dark-mode .form-select:focus {
             background-color: #4f4f4f; /* Darker focus for inputs */
         }

        .form-control-sm, .form-select-sm {
            padding: 0.45rem 0.9rem; font-size: 0.9rem;
            border-radius: var(--border-radius-sm);
        }
        .form-text {
             color: var(--text-muted);
             transition: color var(--transition-speed) var(--transition-easing);
        }

        /* --- Primary Button Styling (Generate Report Button) --- */
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 22px;
            font-size: 1rem; font-weight: 500;
            border-radius: var(--border-radius-sm);
            color: #fff; /* Ensure text is white */
            transition: background-color var(--transition-speed) var(--transition-easing),
                        border-color var(--transition-speed) var(--transition-easing),
                        box-shadow var(--transition-speed) var(--transition-easing),
                        filter var(--transition-speed) var(--transition-easing),
                        color var(--transition-speed) var(--transition-easing),
                        opacity var(--transition-speed) var(--transition-easing);
        }

        /* Generic Hover/Focus/Active - Use Brightness */
        .btn-primary:hover {
            filter: brightness(115%);
            /* Explicitly set colors to avoid inheriting Bootstrap's blue */
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: #fff;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        .btn-primary:focus,
        .btn-primary:active {
            filter: brightness(110%);
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: #fff;
            box-shadow: 0 0 0 0.2rem rgba(var(--primary-color-rgb), 0.5), 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        .btn-primary:disabled,
        .btn-primary.disabled {
            filter: none;
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            opacity: 0.65;
        }

        /* Specific Dark Mode Overrides for btn-primary */
        body.dark-mode .btn-primary {
             /* Base state already covered by variable swap, but can reiterate if needed */
             background-color: var(--dm-primary-color);
             border-color: var(--dm-primary-color);
             color: #fff;
        }
        body.dark-mode .btn-primary:hover {
             filter: brightness(120%); /* Slightly more brightness for dark */
             background-color: var(--dm-primary-color); /* Keep red */
             border-color: var(--dm-primary-color); /* Keep red */
             color: #fff; /* Keep white */
             box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3); /* Darker shadow */
        }
        body.dark-mode .btn-primary:focus,
        body.dark-mode .btn-primary:active {
             filter: brightness(110%); /* Keep red */
             background-color: var(--dm-primary-color); /* Keep red */
             border-color: var(--dm-primary-color); /* Keep red */
             color: #fff; /* Keep white */
             /* Darker focus ring and shadow */
             box-shadow: 0 0 0 0.2rem rgba(var(--dm-primary-color-rgb), 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
        }
        body.dark-mode .btn-primary:disabled,
        body.dark-mode .btn-primary.disabled {
             filter: none;
             background-color: var(--dm-primary-color); /* Keep red */
             border-color: var(--dm-primary-color); /* Keep red */
             opacity: 0.5; /* Maybe slightly more transparent in dark mode */
        }

        .spinner-border { display: none; margin-right: 8px; width: 1.1rem; height: 1.1rem; color: currentColor; }
        #upload-form.processing .spinner-border { display: inline-block; }
        #upload-form.processing button[type="submit"] { cursor: not-allowed; opacity: 0.7; } /* Keep generic processing style */


        /* --- State When Results are Loaded --- */
        body.results-loaded #form-wrapper {
            opacity: 0; transform: translateY(-20px) scale(0.95);
            max-height: 0; padding-top: 0; padding-bottom: 0;
            margin-top: 0; margin-bottom: 0; border-width: 0;
            pointer-events: none;
        }

        /* --- Result Area Styling & Animation --- */
         .result-area {
             margin-top: 0;
             opacity: 0;
             transform: translateY(20px);
             transition: opacity 0.6s ease-out 0.2s, transform 0.6s ease-out 0.2s;
             text-align: center;
         }
         body.results-loaded .result-area {
             opacity: 1;
             transform: translateY(0);
         }

        /* --- Patient Info Section Styling --- */
        #patient-info-section {
            text-align: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-secondary);
             transition: border-color var(--transition-speed) var(--transition-easing);
        }
        #patient-info-section h3 {
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 10px;
            border-bottom: none;
            display: inline-block;
             transition: color var(--transition-speed) var(--transition-easing);
        }
        #patient-info-data {
            font-size: 0.95rem;
            color: var(--text-primary);
             transition: color var(--transition-speed) var(--transition-easing);
        }
         #patient-info-data span {
            margin: 0 8px;
            color: var(--text-muted);
             transition: color var(--transition-speed) var(--transition-easing);
         }
         #patient-info-data strong {
             font-weight: 500;
             color: var(--text-secondary);
             transition: color var(--transition-speed) var(--transition-easing);
         }

         /* Adjust result columns */
         .result-area .row .col-md-6 {
             display: flex;
             flex-direction: column;
             align-items: center;
             margin-bottom: 20px;
         }
          .result-area .row .col-md-6 h2 {
             width: 100%;
             text-align: center;
         }
         .img-preview-container, .report-box-container {
              width: 100%;
              max-width: 500px;
              margin: 0 auto;
         }


        /* --- Image Preview & Zoom Styling --- */
        #image-result-area { position: relative; width: 100%; }
        .img-preview {
            max-width: 100%; height: auto; border: 1px solid var(--border-secondary);
            border-radius: var(--border-radius-md); box-shadow: var(--shadow-soft);
            display: block;
            margin: 0 auto;
            transition: box-shadow var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
            cursor: crosshair;
        }
        .img-preview:hover { box-shadow: var(--shadow-hover); }

        #zoom-preview-panel {
            position: absolute; width: 250px; height: 250px;
            background-color: var(--bg-content);
            border: 2px solid var(--primary-color);
            border-radius: var(--border-radius-md); box-shadow: var(--shadow-hover);
            background-repeat: no-repeat; background-size: 0 0; background-position: 0 0;
            opacity: 0; visibility: hidden;
            transition: opacity 0.2s ease-out, visibility 0s linear 0.2s, background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
            pointer-events: none; z-index: 100; overflow: hidden;
            top: 0; left: calc(100% + 15px);
        }
        /* Adjust zoom panel side */
         @media (max-width: 1200px) and (min-width: 992px) {
             #zoom-preview-panel { left: auto; right: calc(100% + 15px); }
         }

        /* --- Zoom Slider Controls Styling --- */
        #zoom-controls {
            max-width: 300px;
            margin-left: auto;
            margin-right: auto;
            opacity: 0;
            transition: opacity 0.5s ease-in-out;
            display: none;
        }
        body.results-loaded #zoom-controls {
            display: block;
            opacity: 1;
        }
        #zoom-controls .form-label-sm {
            font-size: 0.8rem;
            color: var(--text-secondary);
            transition: color var(--transition-speed) var(--transition-easing);
        }
        #zoom-slider {
            cursor: pointer;
             /* Style the range input */
             accent-color: var(--primary-color); /* Modern way to color thumb/track */
             transition: accent-color var(--transition-speed) var(--transition-easing);
        }
        /* Fallback/more specific styling if needed */
        body.dark-mode #zoom-slider::-webkit-slider-runnable-track { background-color: #555; }
        body.dark-mode #zoom-slider::-moz-range-track { background-color: #555; }
        /* Thumb is handled by accent-color */


        /* Hide zoom panel & slider on medium/small screens */
         @media (max-width: 991.98px) {
             #zoom-preview-panel, #zoom-controls {
                  display: none !important;
             }
             .img-preview { cursor: default; }
         }

        /* --- Report Box Styling --- */
        .report-box {
            border: 1px solid var(--border-secondary); padding: 25px;
            background-color: var(--bg-content); border-radius: var(--border-radius-md);
            min-height: 250px;
            font-family: 'Roboto', 'Consolas', 'Courier New', monospace;
            font-size: 0.95rem;
            color: var(--text-report); white-space: pre-wrap; word-wrap: break-word;
            box-shadow: var(--shadow-soft); line-height: 1.7;
            text-align: left;
            transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), box-shadow var(--transition-speed) var(--transition-easing);
        }

        /* --- Medical Term Highlighting --- */
        .medical-term-finding {
            font-weight: 600;
            color: var(--highlight-finding-color);
            transition: color var(--transition-speed) var(--transition-easing);
        }
        .medical-term-device {
            font-weight: 600;
            color: var(--highlight-device-color);
            transition: color var(--transition-speed) var(--transition-easing);
        }

        /* --- Medical Icon Styling --- */
        .medical-icon {
            margin-left: 6px;
            color: var(--text-secondary);
            font-size: 0.9em;
            cursor: help;
            vertical-align: middle;
             transition: color var(--transition-speed) var(--transition-easing);
        }
        /* Bootstrap Tooltip Overrides */
         .tooltip .tooltip-inner {
            background-color: var(--text-secondary); /* Default tooltip bg */
            color: var(--bg-content); /* Default tooltip text */
            font-size: 0.8rem;
            padding: 5px 10px;
            border-radius: var(--border-radius-sm);
            transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
         }
         .tooltip.bs-tooltip-auto[data-popper-placement^=top] .tooltip-arrow::before,
         .tooltip.bs-tooltip-top .tooltip-arrow::before {
             border-top-color: var(--text-secondary);
             transition: border-top-color var(--transition-speed) ease;
         }
         /* Add other arrow directions if needed */

         body.dark-mode .tooltip .tooltip-inner {
            background-color: #f0f0f0; /* Light background for dark mode tooltips */
            color: #333; /* Dark text */
         }
         body.dark-mode .tooltip.bs-tooltip-auto[data-popper-placement^=top] .tooltip-arrow::before,
         body.dark-mode .tooltip.bs-tooltip-top .tooltip-arrow::before {
             border-top-color: #f0f0f0;
         }
         /* Add other arrow directions for dark mode if needed */


        /* --- Hidden element for report context --- */
        #report-context-data { display: none; }

        /* --- Reset Button --- */
         #reset-button {
              display: none;
              margin-top: 30px;
              margin-bottom: 0;
              opacity: 0; transition: opacity var(--transition-speed) var(--transition-easing) 0.5s, color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), background-color var(--transition-speed) var(--transition-easing);
              padding: 10px 20px;
              font-size: 0.95rem; border-radius: var(--border-radius-sm);
              align-items: center; justify-content: center; gap: 8px;
              color: #6c757d;
              border: 1px solid #6c757d;
              background-color: transparent;
         }
         #reset-button:hover {
              color: #fff;
              background-color: #5c636a; /* Slightly darker secondary */
              border-color: #565e64;
         }
         body.dark-mode #reset-button {
              color: var(--dm-text-secondary);
              border-color: var(--dm-border-secondary); /* Use darker border */
         }
         body.dark-mode #reset-button:hover {
              color: var(--dm-bg-primary);
              background-color: var(--dm-text-secondary);
              border-color: var(--dm-text-secondary);
         }
         body.results-loaded #reset-button {
             display: inline-flex;
             opacity: 1;
         }
         #reset-button svg { width: 1em; height: 1em; fill: currentColor; }

        /* --- Student Notes Section Styling --- */
        #student-notes-section {
            margin-top: 40px;
            padding-top: 25px;
            border-top: 1px solid var(--border-secondary);
            text-align: left;
            opacity: 0;
            display: none;
            transition: opacity 0.6s ease-out 0.4s, border-color var(--transition-speed) var(--transition-easing);
        }
        body.results-loaded #student-notes-section {
            display: block;
            opacity: 1;
        }
        .notes-input-area {
            background-color: var(--bg-content);
            padding: 20px;
            border-radius: var(--border-radius-md);
            border: 1px solid var(--border-secondary);
            box-shadow: var(--shadow-inset);
            transition: background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
        }
        #student-notes-textarea,
        #student-notes-keywords {
            font-size: 0.9rem;
            line-height: 1.6;
            resize: vertical;
            background-color: var(--bg-input);
            color: var(--text-primary);
            border: 1px solid var(--border-secondary);
            transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), box-shadow var(--transition-speed) var(--transition-easing);
        }
         #student-notes-textarea {
            min-height: 150px;
        }
        #student-notes-textarea::placeholder,
        #student-notes-keywords::placeholder {
             color: var(--text-input-placeholder);
             opacity: 1;
        }
        #student-notes-textarea:focus,
        #student-notes-keywords:focus {
            background-color: var(--bg-input);
            color: var(--text-primary);
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(var(--primary-color-rgb), 0.25);
        }
        body.dark-mode #student-notes-textarea,
        body.dark-mode #student-notes-keywords {
             box-shadow: inset 0 1px 3px rgba(0,0,0,0.3);
        }
        body.dark-mode #student-notes-textarea:focus,
        body.dark-mode #student-notes-keywords:focus {
             background-color: #4f4f4f;
        }


        .notes-input-area label.form-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 500;
             transition: color var(--transition-speed) var(--transition-easing);
        }
        #copy-notes-button {
            font-weight: 500;
             color: var(--primary-color);
             border: 1px solid var(--primary-color); /* Use 1px border for outline */
             background-color: transparent;
             transition: color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing), background-color var(--transition-speed) var(--transition-easing);
        }
        #copy-notes-button:hover {
            color: #fff;
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
         body.dark-mode #copy-notes-button {
             /* Base color/border already handled by variable swap */
         }
        body.dark-mode #copy-notes-button:hover {
             color: #fff; /* Ensure text stays white on red bg */
             background-color: var(--dm-primary-color);
             border-color: var(--dm-primary-color);
        }
         /* Style for the 'Copied' state */
         #copy-notes-button:disabled {
              opacity: 0.8; /* Make slightly transparent when copied */
              cursor: default;
              /* Use green tones for success feedback */
              background-color: #d1e7dd;
              border-color: #badbcc;
              color: #0f5132;
         }
          body.dark-mode #copy-notes-button:disabled {
              background-color: #143625; /* Dark green */
              border-color: #1c4a32;
              color: #75b798; /* Lighter green text */
          }

        #copy-feedback {
             font-weight: 500;
             font-size: 0.85rem;
             opacity: 0;
             transition: opacity 0.5s ease, color 0.5s ease;
             color: #198754; /* Default success color */
        }
         body.dark-mode #copy-feedback.text-success {
             color: #61e7a9; /* Lighter green for dark mode */
         }
         body.dark-mode #copy-feedback.text-danger {
             color: #ff8a80; /* Lighter red for dark mode */
         }

        /* --- Alert Styling Adaptation --- */
         .alert {
             /* Rely on Bootstrap defaults mostly, override where needed */
             transition: background-color var(--transition-speed) var(--transition-easing), color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing);
         }
         /* Example: Warning Alert */
         body.dark-mode .alert-warning {
             background-color: #4d3c11;
             border-color: #664d03;
             color: #ffecb5;
         }
         /* Example: Danger Alert */
         body.dark-mode .alert-danger {
             background-color: #4c161c;
             border-color: #842029;
             color: #fcc8cb;
         }
         /* Add other alert types (info, success) if used and need dark overrides */
         body.dark-mode .btn-close {
             filter: invert(1) grayscale(100%) brightness(200%);
         }


        /* --- Responsive adjustments --- */
        @media (max-width: 991.98px) { /* Medium screens and below */
            #chat-column {
                border-right: none; border-bottom: 1px solid var(--border-secondary);
                padding-right: 0; margin-bottom: 30px;
                height: 60vh; min-height: 450px;
            }
            #content-column {
                padding-left: 0; max-height: none; overflow-y: visible;
            }
            .container-fluid { padding: 25px; }
            h1 { font-size: 1.9rem; }
            h2 { font-size: 1.4rem; }
             .result-area .row > div[class*="col-md-"] {
                 width: 100%;
                 margin-bottom: 25px;
             }
        }
        @media (max-width: 767.98px) { /* Small screens */
             #title-and-toggle { flex-direction: column; align-items: center; gap: 10px; } /* Stack title and toggle */
             h1 { font-size: 1.7rem; text-align: center; } /* Center title */
             h2 { font-size: 1.3rem; }
             .container-fluid { padding: 20px; }
             #chat-column { height: 55vh; min-height: 400px; }
             .btn-primary, #reset-button { font-size: 0.9rem; padding: 10px 18px;}
             #send-button { width: 40px; height: 40px; }
             #send-button svg { width: 18px; height: 18px; }
             #chat-input { padding: 8px 15px; }
             .report-box { padding: 20px; font-size: 0.9rem; min-height: 200px;}
             #student-notes-textarea { min-height: 120px; }
        }

    </style>
</head>
<!-- Add 'results-loaded' class server-side if results exist -->
<body class="{{ 'results-loaded' if report or image_data else '' }}">
    <div class="container-fluid">
        <!-- MODIFIED: Wrap H1 and add Toggle Button -->
        <div id="title-and-toggle" class="d-flex justify-content-between align-items-center mb-4">
            <h1 class="flex-grow-1">Chest X-ray Report Generation</h1> 
            <button id="darkModeToggle" class="btn btn-sm flex-shrink-0" aria-label="Toggle dark mode" title="Toggle dark mode">
                <i class="fas fa-moon"></i> <!-- Moon icon initially -->
            </button>
        </div>

        <!-- Flash Messages -->
        <div id="flash-message-container">
            {% with messages = get_flashed_messages(with_categories=true) %}
              {% if messages %}
                {% for category, message in messages %}
                  <div class="alert alert-{{ category }} alert-dismissible fade show mb-3" role="alert">
                    {{ message }}
                    <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
                  </div>
                {% endfor %}
              {% endif %}
            {% endwith %}
        </div>

        <!-- Main Row: Chat on Left, Content on Right -->
        <div class="row main-row">

            <!-- Chat Column (Left) -->
            <div class="col-lg-5" id="chat-column" class="{{ 'disabled' if not report or not chatbot_available }}">
                 <h2><i class="fas fa-comments me-2"></i>Chat about Report</h2>
                 <small class="text-muted mb-2 d-block">Ask questions based *only* on the generated report.</small>

                 {% if report and not chatbot_available %}
                     <div class="alert alert-warning small p-2 mt-2">Chatbot (Llama 3.1) is not available or failed to load. Please check server logs.</div>
                 {% endif %}

                <div id="chat-container">
                     <div id="chat-placeholder">Generate a report first to enable chat.</div>
                    <div id="chat-messages">
                        {% if report and chatbot_available %}
                         <div class="chat-message bot-message" style="opacity: 1; transform: none;">Welcome! Ask me about the findings, impression, or specific details in the report above.</div>
                         {% endif %}
                    </div>
                    <form id="chat-form" action="javascript:void(0);">
                        <input type="text" id="chat-input" class="form-control" placeholder="Type your question..." autocomplete="off" {% if not report or not chatbot_available %}disabled{% endif %}>
                        <button type="submit" id="send-button" class="btn btn-primary" {% if not report or not chatbot_available %}disabled{% endif %}>
                             <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M3.478 2.405a.75.75 0 00-.926.94l2.432 7.905H13.5a.75.75 0 010 1.5H4.984l-2.432 7.905a.75.75 0 00.926.94 60.519 60.519 0 0018.445-8.986.75.75 0 000-1.218A60.517 60.517 0 003.478 2.405z" /></svg>
                        </button>
                    </form>
                    <div id="example-questions" {% if not report or not chatbot_available %}style="display: none;"{% endif %}>
                        <small>Example Questions:</small>
                        <button class="suggestion-btn">What are the main findings?</button>
                        <button class="suggestion-btn">Are there any tubes or lines mentioned?</button>
                        <button class="suggestion-btn">Summarize the impression.</button>
                        <button class="suggestion-btn">Is the heart size normal?</button>
                        <button class="suggestion-btn">Any signs of pleural effusion?</button>
                    </div>
                </div>
            </div>

            <!-- Content Column (Right - Form, Image, Report, Notes) -->
            <div class="col-lg-7" id="content-column">

                <!-- Form Section Wrapper (for animation) -->
                <div id="form-wrapper">
                    <h2><i class="fas fa-upload me-2"></i>Generate Report</h2>
                    <form id="upload-form" method="post" enctype="multipart/form-data" action="{{ url_for('predict') }}">
                        <div class="mb-3">
                            <label for="imageUpload" class="form-label">1. Upload Chest X-Ray Image:</label>
                            <input class="form-control form-control-sm" type="file" id="imageUpload" name="image" accept="image/png, image/jpeg, image/jpg" required>
                            <div class="form-text">Allowed formats: PNG, JPG, JPEG. Filename format like '...-View-Age-Gender-Ethnicity.png' helps extract patient info.</div>
                        </div>
                        <div class="mb-3">
                            <label for="vlmSelect" class="form-label">2. Choose Vision-Language Model:</label>
                            <select class="form-select form-select-sm" id="vlmSelect" name="vlm_choice">
                                <option value="swin_t5_chexpert" selected>Swin-T5 (CheXpert Trained)</option>
                                <!-- Add other VLM options here if available -->
                            </select>
                        </div>
                        <div class="mb-3">
                            <label for="maxLength" class="form-label">3. Max Report Length (tokens):</label>
                            <input type="number" class="form-control form-control-sm" id="maxLength" name="max_length" value="100" min="10" max="512">
                            <div class="form-text">Adjusts the maximum length of the generated report (default: 100).</div>
                        </div>
                        <button type="submit" class="btn btn-primary w-100 mt-2">
                             <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
                             <i class="fas fa-file-medical-alt me-1"></i> Generate Report
                        </button>
                    </form>
                </div>
                <!-- End Form Section -->

                <!-- Result Section (Only render if data exists) -->
                {% if report or image_data %}
                <div class="result-area">
                    <!-- Patient Info -->
                    {% if patient_info %}
                    <div id="patient-info-section">
                       <h3><i class="fas fa-user-md me-2"></i>Patient Information</h3>
                       <p id="patient-info-data">
                           <strong>View:</strong> {{ patient_info.view | e }}
                           <span>|</span>
                           <strong>Age:</strong> {{ patient_info.age | e }}
                           <span>|</span>
                           <strong>Gender:</strong> {{ patient_info.gender | e }}
                           <span>|</span>
                           <strong>Ethnicity:</strong> {{ patient_info.ethnicity | e }}
                       </p>
                    </div>
                    {% elif image_data %}
                     <div id="patient-info-section">
                        <p class="text-muted small"><em>Patient information could not be parsed from the filename.</em></p>
                    </div>
                    {% endif %}

                    <!-- Image and Report Row -->
                    <div class="row">
                        <!-- Image Column -->
                        {% if image_data %}
                        <div class="col-md-6">
                            <div class="img-preview-container" id="image-result-area">
                                <h2><i class="fas fa-image me-2"></i>Uploaded Image</h2>
                                <img id="uploaded-image" src="data:image/jpeg;base64,{{ image_data }}" alt="Uploaded Chest X-ray" class="img-preview">
                                <div id="zoom-preview-panel"></div>
                                <small class="d-block text-muted mt-2">Hover over image to zoom (on desktop).</small>
                                <div id="zoom-controls" class="mt-3">
                                    <label for="zoom-slider" class="form-label form-label-sm mb-1 d-block text-center">Zoom Level: <span id="zoom-value">2.0</span>x</label>
                                    <input type="range" class="form-range" id="zoom-slider" min="1" max="5" step="0.1" value="2">
                                </div>
                            </div>
                        </div>
                        {% endif %}

                        <!-- Report Column -->
                        {% if report %}
                        <div class="col-md-6">
                            <div class="report-box-container">
                                <h2><i class="fas fa-file-alt me-2"></i>Generated Report</h2>
                                <div class="report-box">
                                    <!-- Highlight medical terms dynamically -->
                                    {{ report | safe if report.count('<') > 0 else report | e }}
                                </div>
                                <div id="report-context-data" data-report="{{ report|e }}"></div>
                            </div>
                        </div>
                        {% elif image_data %}
                         <div class="col-md-6">
                             <div class="report-box-container">
                                <h2><i class="fas fa-file-alt me-2"></i>Generated Report</h2>
                                 <div class="alert alert-danger">Report generation failed. Please check the logs or try again.</div>
                             </div>
                         </div>
                        {% endif %}
                    </div> <!-- End Result Row -->

                     <!-- Reset Button -->
                     <button id="reset-button" class="btn btn-outline-secondary">
                         <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-clockwise" viewBox="0 0 16 16" aria-hidden="true">
                           <path fill-rule="evenodd" d="M8 3a5 5 0 1 0 4.546 2.914.5.5 0 0 1 .908-.417A6 6 0 1 1 8 2v1z"/>
                           <path d="M8 4.466V.534a.25.25 0 0 1 .41-.192l2.36 1.966c.12.1.12.284 0 .384L8.41 4.658A.25.25 0 0 1 8 4.466z"/>
                         </svg>
                         <span>Start Over / New Image</span>
                     </button>

                </div> <!-- End Result Area -->
                {% endif %}
                <!-- End Result Section -->

                <!-- Student Notes Section -->
                {% if report or image_data %} {# Only show notes if results exist #}
                <div id="student-notes-section">
                    <h3><i class="fas fa-user-graduate me-2"></i>Notes for Medical Student</h3>
                    <div class="notes-input-area p-3 border rounded shadow-sm">
                        <div class="mb-3">
                            <label for="student-notes-textarea" class="form-label fw-bold">Observations & Learning Points:</label>
                            <textarea class="form-control form-control-sm" id="student-notes-textarea" rows="8" placeholder="Enter key observations, differential diagnoses, relevant anatomy, clinical correlations, or questions for the student..."></textarea>
                        </div>
                        <div class="mb-3">
                            <label for="student-notes-keywords" class="form-label fw-bold">Keywords/Tags:</label>
                            <input type="text" class="form-control form-control-sm" id="student-notes-keywords" placeholder="e.g., Pneumonia, Cardiomegaly, Atelectasis, PICC Line Placement">
                        </div>
                        <button id="copy-notes-button" class="btn btn-sm btn-outline-primary w-100">
                            <i class="fas fa-copy me-1"></i> Copy Notes & Keywords to Clipboard
                        </button>
                         <small id="copy-feedback" class="d-block text-center text-success mt-2">Copied!</small>
                    </div>
                </div>
                {% endif %}
                <!-- End Student Notes Section -->

            </div> <!-- End Content Column -->
        </div> <!-- End Main Row -->
    </div> <!-- End Container -->

    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
    <script>
        document.addEventListener('DOMContentLoaded', () => {

            // --- Initialize Bootstrap Tooltips ---
            var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'));
            var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) {
              // Add container: 'body' to prevent tooltip being clipped in tight spaces
              return new bootstrap.Tooltip(tooltipTriggerEl, { container: 'body', boundary: document.body });
            });

            // --- Dark Mode Toggle Functionality ---
            const darkModeToggle = document.getElementById('darkModeToggle');
            const bodyElement = document.body;
            const toggleIcon = darkModeToggle?.querySelector('i');

            const applyTheme = (theme) => {
                if (!toggleIcon) return;
                const isDark = theme === 'dark';

                bodyElement.classList.toggle('dark-mode', isDark);
                toggleIcon.classList.toggle('fa-moon', !isDark);
                toggleIcon.classList.toggle('fa-sun', isDark);
                localStorage.setItem('theme', theme);
                const label = isDark ? 'Switch to light mode' : 'Switch to dark mode';
                darkModeToggle.setAttribute('aria-label', label);
                darkModeToggle.setAttribute('title', label); // Update tooltip title attribute

                // Refresh the specific tooltip instance for the toggle button
                const toggleTooltipInstance = bootstrap.Tooltip.getInstance(darkModeToggle);
                if (toggleTooltipInstance) {
                    toggleTooltipInstance.setContent({ '.tooltip-inner': label });
                }
            };

            if (darkModeToggle && toggleIcon) {
                const preferredTheme = localStorage.getItem('theme') ||
                                      (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
                applyTheme(preferredTheme);

                darkModeToggle.addEventListener('click', () => {
                    const newTheme = bodyElement.classList.contains('dark-mode') ? 'light' : 'dark';
                    applyTheme(newTheme);
                });

                window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
                    if (!localStorage.getItem('theme')) { // Only follow system if no manual choice
                         applyTheme(event.matches ? 'dark' : 'light');
                    }
                });
            }
            // --- End Dark Mode Toggle ---


            // --- Form Processing Indicator & Animation Control ---
            const form = document.getElementById('upload-form');
            const formWrapper = document.getElementById('form-wrapper');
            const submitButton = form?.querySelector('button[type="submit"]');
            const spinner = submitButton?.querySelector('.spinner-border');

            if (form && submitButton && formWrapper) {
                 form.addEventListener('submit', function(e) {
                     const fileInput = document.getElementById('imageUpload');
                     if (!fileInput || fileInput.files.length === 0) { return; }
                     form.classList.add('processing');
                     submitButton.disabled = true;
                     if (spinner) spinner.style.display = 'inline-block';
                     submitButton.querySelector('i')?.classList.add('d-none');
                 });
            }

             window.addEventListener('pageshow', function(event) {
                 if (event.persisted || (window.performance && window.performance.getEntriesByType("navigation")[0].type === 'back_forward')) { // More robust check
                    if (form && submitButton && spinner) {
                        form.classList.remove('processing');
                        submitButton.disabled = false;
                        spinner.style.display = 'none';
                        submitButton.querySelector('i')?.classList.remove('d-none');
                    }
                    const reportContextData = document.getElementById('report-context-data');
                    bodyElement.classList.toggle('results-loaded', !!(reportContextData && reportContextData.dataset.report));
                 }
            });

            // --- Chat Functionality ---
            const chatForm = document.getElementById('chat-form');
            const chatInput = document.getElementById('chat-input');
            const chatMessages = document.getElementById('chat-messages');
            const sendButton = document.getElementById('send-button');
            const reportContextData = document.getElementById('report-context-data');
            const chatColumn = document.getElementById('chat-column');
            const chatPlaceholder = document.getElementById('chat-placeholder');
            const exampleQuestionsContainer = document.getElementById('example-questions');
            const reportContext = reportContextData ? reportContextData.dataset.report : null;
            const isChatbotAvailable = {{ chatbot_available | tojson }};
            const isChatEnabled = !!reportContext && isChatbotAvailable;

             if (chatColumn) {
                 const enableChatUI = (enable) => {
                     chatColumn.classList.toggle('disabled', !enable);
                     if (chatInput) chatInput.disabled = !enable;
                     if (sendButton) sendButton.disabled = !enable;
                     if (chatPlaceholder) chatPlaceholder.style.display = enable ? 'none' : 'block';
                     if (exampleQuestionsContainer) exampleQuestionsContainer.style.display = enable ? 'block' : 'none';
                 };
                 enableChatUI(isChatEnabled);
                 if (isChatEnabled && chatMessages) {
                     chatMessages.scrollTop = chatMessages.scrollHeight;
                 }
             }

            function addChatMessage(message, sender, isThinking = false) {
                if (!chatMessages) return null;
                const messageDiv = document.createElement('div');
                messageDiv.classList.add('chat-message', sender === 'user' ? 'user-message' : 'bot-message');
                if (isThinking) {
                    messageDiv.classList.add('thinking');
                    messageDiv.innerHTML = '<span> Thinking...</span>';
                } else {
                    const sanitizedMessage = message.replace(/</g, "<").replace(/>/g, ">");
                    messageDiv.innerHTML = sanitizedMessage;
                }
                chatMessages.appendChild(messageDiv);
                chatMessages.scrollTo({ top: chatMessages.scrollHeight, behavior: 'smooth' });
                return messageDiv;
            }

            if (chatForm && isChatEnabled) {
                chatForm.addEventListener('submit', async (e) => {
                    e.preventDefault();
                    if (!chatInput || !reportContext) return;
                    const question = chatInput.value.trim();
                    if (!question || chatInput.disabled) return; // Prevent multiple submits

                    addChatMessage(question, 'user');
                    chatInput.value = '';
                    chatInput.disabled = true; // Disable during processing
                    if (sendButton) sendButton.disabled = true;
                    const thinkingMessageElement = addChatMessage('', 'bot', true);

                    try {
                        const response = await fetch("{{ url_for('chat') }}", {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({ question: question, report_context: reportContext }),
                        });
                        if (thinkingMessageElement) thinkingMessageElement.remove(); // Remove thinking indicator

                        if (!response.ok) {
                            let errorMsg = `Chat Error: ${response.status || ''} ${response.statusText}`;
                            try {
                                const errorData = await response.json();
                                errorMsg = `Chat Error: ${errorData.error || response.statusText}`;
                            } catch (e) { /* Ignore */ }
                            // Use CSS vars for error color - find the finding highlight color
                            addChatMessage(errorMsg, 'bot').style.color = 'var(--highlight-finding-color)';
                        } else {
                            const data = await response.json();
                            addChatMessage(data.answer || "Received empty response.", 'bot');
                        }
                    } catch (error) {
                        console.error("Chat fetch error:", error);
                        if (thinkingMessageElement) thinkingMessageElement.remove();
                        addChatMessage('Error connecting to the chat service.', 'bot').style.color = 'var(--highlight-finding-color)';
                    } finally {
                        if(chatInput) chatInput.disabled = false; // Re-enable input
                        if(sendButton) sendButton.disabled = false; // Re-enable button
                        if(chatInput) chatInput.focus();
                        if(chatMessages) chatMessages.scrollTo({ top: chatMessages.scrollHeight, behavior: 'smooth' });
                    }
                });
            } else if (chatForm) { chatForm.addEventListener('submit', (e) => e.preventDefault()); }

            if (exampleQuestionsContainer && chatInput && isChatEnabled) {
                exampleQuestionsContainer.addEventListener('click', (e) => {
                    if (e.target?.classList.contains('suggestion-btn')) {
                         e.preventDefault();
                        const questionText = e.target.textContent || e.target.innerText;
                        if (questionText && !chatInput.disabled) { chatInput.value = questionText; chatInput.focus(); }
                    }
                });
            }

            // --- Image Hover Zoom Functionality (with Slider) ---
            const imagePreview = document.getElementById('uploaded-image');
            const zoomPanel = document.getElementById('zoom-preview-panel');
            const imageContainer = document.getElementById('image-result-area');
            const zoomSlider = document.getElementById('zoom-slider');
            const zoomValueDisplay = document.getElementById('zoom-value');
            const zoomControls = document.getElementById('zoom-controls');

            if (imagePreview && zoomPanel && imageContainer && zoomSlider && zoomValueDisplay && zoomControls) {
                 let naturalWidth = 0, naturalHeight = 0;
                 let currentZoomLevel = parseFloat(zoomSlider.value);
                 let lastPercX = 0.5, lastPercY = 0.5;
                 let isZoomActive = false;

                 const updateZoomPanelBackground = () => {
                    if (naturalWidth > 0 && isZoomActive) { // Check isZoomActive here
                        zoomPanel.style.backgroundSize = `${naturalWidth * currentZoomLevel}px ${naturalHeight * currentZoomLevel}px`;
                        const panelRect = zoomPanel.getBoundingClientRect();
                        const bgX = -(lastPercX * (naturalWidth * currentZoomLevel - panelRect.width));
                        const bgY = -(lastPercY * (naturalHeight * currentZoomLevel - panelRect.height));
                        zoomPanel.style.backgroundPosition = `${bgX}px ${bgY}px`;
                    }
                 };

                 const updateImageDimensions = () => {
                     naturalWidth = imagePreview.naturalWidth;
                     naturalHeight = imagePreview.naturalHeight;
                     // No need to call updateZoomPanelBackground here, it happens on mouseenter
                     if (naturalWidth === 0 && zoomControls) {
                         zoomControls.style.display = 'none';
                     }
                 };

                 if (imagePreview.complete && imagePreview.naturalWidth > 0) { updateImageDimensions(); }
                 else { imagePreview.onload = updateImageDimensions; imagePreview.onerror = updateImageDimensions; }


                 imageContainer.addEventListener('mouseenter', () => {
                     if (naturalWidth > 0 && window.innerWidth >= 992) {
                        isZoomActive = true; // Set flag first
                        zoomPanel.style.backgroundImage = `url('${imagePreview.src}')`;
                        updateZoomPanelBackground(); // Now update with current mouse pos/zoom
                        zoomPanel.style.opacity = '1'; zoomPanel.style.visibility = 'visible';
                        zoomPanel.style.transition = 'opacity 0.2s ease-out, visibility 0s linear 0s, background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing)';
                     }
                 });

                 imageContainer.addEventListener('mousemove', (e) => {
                    if (!isZoomActive || naturalWidth === 0) return;
                    const imgRect = imagePreview.getBoundingClientRect();
                    lastPercX = Math.max(0, Math.min(1, (e.clientX - imgRect.left) / imgRect.width));
                    lastPercY = Math.max(0, Math.min(1, (e.clientY - imgRect.top) / imgRect.height));
                    updateZoomPanelBackground();

                    // Position calculation remains the same
                    const containerRect = imageContainer.getBoundingClientRect();
                    const panelRect = zoomPanel.getBoundingClientRect(); // Get updated rect if size changed
                    const gap = 15;
                    let panelLeft = 'auto', panelRight = 'auto';
                    if ((window.innerWidth - containerRect.right - gap) >= panelRect.width) {
                        panelLeft = `${imgRect.right - containerRect.left + gap}px`;
                    } else if ((containerRect.left - gap) >= panelRect.width) {
                        panelRight = `${containerRect.right - imgRect.left + gap}px`;
                    } else {
                         panelLeft = `${imgRect.right - containerRect.left + gap}px`; // Default right
                    }
                    zoomPanel.style.left = panelLeft;
                    zoomPanel.style.right = panelRight;
                    zoomPanel.style.top = `${imgRect.top - containerRect.top}px`;
                 });

                imageContainer.addEventListener('mouseleave', () => {
                    isZoomActive = false; // Reset flag
                    zoomPanel.style.opacity = '0'; zoomPanel.style.visibility = 'hidden';
                    zoomPanel.style.transition = 'opacity 0.2s ease-out, visibility 0s linear 0.2s, background-color var(--transition-speed) var(--transition-easing), border-color var(--transition-speed) var(--transition-easing)';
                });

                zoomSlider.addEventListener('input', () => {
                    currentZoomLevel = parseFloat(zoomSlider.value);
                    zoomValueDisplay.textContent = currentZoomLevel.toFixed(1);
                    updateZoomPanelBackground(); // Update view immediately
                });
            }

            // --- Student Notes Functionality ---
            const notesTextArea = document.getElementById('student-notes-textarea');
            const keywordsInput = document.getElementById('student-notes-keywords');
            const copyNotesButton = document.getElementById('copy-notes-button');
            const copyFeedback = document.getElementById('copy-feedback');

            if (copyNotesButton && notesTextArea && keywordsInput && copyFeedback) {
                copyNotesButton.addEventListener('click', () => {
                    const notes = notesTextArea.value.trim();
                    const keywords = keywordsInput.value.trim();
                    let textToCopy = "--- Medical Student Notes ---\n\n";
                    if (keywords) { textToCopy += `Keywords/Tags:\n${keywords}\n\n`; }
                    if (notes) { textToCopy += `Observations & Learning Points:\n${notes}\n`; }
                    else if (!keywords) { textToCopy += "(No notes or keywords entered)"; }

                    navigator.clipboard.writeText(textToCopy).then(() => {
                        copyFeedback.textContent = 'Copied!';
                        copyFeedback.classList.remove('text-danger');
                        copyFeedback.classList.add('text-success');
                        copyFeedback.style.opacity = '1';
                        copyNotesButton.disabled = true;
                        copyNotesButton.innerHTML = '<i class="fas fa-check me-1"></i> Copied!';
                        setTimeout(() => {
                            copyFeedback.style.opacity = '0';
                            copyNotesButton.disabled = false;
                            copyNotesButton.innerHTML = '<i class="fas fa-copy me-1"></i> Copy Notes & Keywords to Clipboard';
                        }, 2000);
                    }).catch(err => {
                        console.error('Failed to copy notes: ', err);
                        copyFeedback.textContent = 'Copy Failed!';
                        copyFeedback.classList.remove('text-success');
                        copyFeedback.classList.add('text-danger');
                        copyFeedback.style.opacity = '1';
                        // Don't disable the button on failure
                        setTimeout(() => {
                           copyFeedback.style.opacity = '0';
                           // Reset text after a delay
                           setTimeout(() => {
                                if (copyFeedback.style.opacity === '0') { // Only reset if still hidden
                                    copyFeedback.textContent = 'Copied!';
                                    copyFeedback.classList.remove('text-danger');
                                    copyFeedback.classList.add('text-success');
                                }
                           }, 500); // Delay before resetting text allows fade out
                        }, 2500);
                    });
                });
            }

            // --- Reset Button Functionality ---
            const resetButton = document.getElementById('reset-button');
             if(resetButton) {
                 resetButton.addEventListener('click', () => { window.location.href = "{{ url_for('index') }}"; });
             }

        }); // End DOMContentLoaded
    </script>

</body>
</html>