/* CSS Custom Properties for easy theming */
        :root {
            --background: #eef2f5;
            --surface: #ffffff;
            --primary: #3b82f6;
            --primary-light: #dbeafe;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --border-color: #e5e7eb;
            --user-bubble-bg: var(--primary);
            --user-bubble-text: #ffffff;
            --past-self-bubble-bg: #e5e7eb;
            --past-self-bubble-text: var(--text-dark);
            --gemini-bubble-bg: #fefce8;
            --gemini-bubble-text: #a16207;
            --gemini-bubble-border: #fde68a;
        }

        /* Basic Reset */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--background);
            color: var(--text-dark);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 1rem;
            overflow: hidden;
        }

        /* Cover Page Styles */
        #cover-page {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 10;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: rgba(238, 242, 245, 0.8);
            backdrop-filter: blur(5px);
            transition: opacity 0.5s ease-in-out, visibility 0.5s;
        }
        
        #cover-page.hidden {
            visibility: hidden;
            opacity: 0;
        }

        .cover-card {
            background: var(--surface);
            padding: 4rem 3rem;
            border-radius: 1rem;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1), 0 5px 10px rgba(0, 0, 0, 0.05);
            text-align: center;
            transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.4s ease-in-out;
            min-width: 300px;
        }
        
        .cover-card h1 {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary);
        }
        
        #enter-chat-btn {
            margin-top: 2rem;
            padding: 0.75rem 2rem;
            font-size: 1rem;
            font-weight: 500;
            color: white;
            background-color: var(--primary);
            border: none;
            border-radius: 9999px;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.2s;
        }

        #enter-chat-btn:hover {
            background-color: #2563eb;
            transform: translateY(-2px);
        }

        #cover-page.opening .cover-card {
            transform: scale(0.9);
            opacity: 0;
        }

        /* Main Chat Application Container */
        .chat-container {
            width: 100%;
            max-width: 768px;
            height: 90vh;
            max-height: 800px;
            background-color: var(--surface);
            border-radius: 1rem;
            box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transform: scale(0.95);
            opacity: 0;
            transition: transform 0.5s ease-in-out 0.2s, opacity 0.5s ease-in-out 0.2s;
        }

        .chat-container.visible {
            transform: scale(1);
            opacity: 1;
        }

        /* Header Section */
        .chat-header {
            padding: 1rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }

        .chat-header h1 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-dark);
        }

        .chat-header p {
            font-size: 0.875rem;
            color: var(--text-light);
            margin-top: 0.25rem;
        }
        
        #summarize-btn {
            position: absolute;
            top: 50%;
            right: 1.5rem;
            transform: translateY(-50%);
            padding: 0.4rem 0.8rem;
            font-size: 0.8rem;
            font-weight: 500;
            background-color: var(--primary-light);
            color: var(--primary);
            border: none;
            border-radius: 999px;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        #summarize-btn:hover {
            background-color: #c7d2fe;
        }
        #summarize-btn:disabled {
            cursor: not-allowed;
            background-color: var(--border-color);
        }

        /* Messages Window */
        .chat-window {
            flex-grow: 1;
            padding: 1.5rem;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .chat-window::-webkit-scrollbar {
            width: 8px;
        }
        .chat-window::-webkit-scrollbar-track {
            background: transparent;
        }
        .chat-window::-webkit-scrollbar-thumb {
            background-color: #d1d5db;
            border-radius: 4px;
        }

        /* Message Bubbles */
        .message {
            display: flex;
            flex-direction: column;
            max-width: 75%;
            animation: fadeIn 0.3s ease-in-out;
        }

        .message-bubble {
            padding: 0.75rem 1rem;
            border-radius: 1.25rem;
            line-height: 1.5;
            word-wrap: break-word;
            position: relative;
        }

        .meta {
            font-size: 0.75rem;
            color: var(--text-light);
            margin-bottom: 0.25rem;
            padding: 0 0.5rem;
        }

        .user-message {
            align-self: flex-end;
            align-items: flex-end;
        }
        .user-message .message-bubble {
            background-color: var(--user-bubble-bg);
            color: var(--user-bubble-text);
            border-bottom-right-radius: 0.5rem;
        }

        .past-self-message {
            align-self: flex-start;
            align-items: flex-start;
        }
        .past-self-message .message-bubble {
            background-color: var(--past-self-bubble-bg);
            color: var(--past-self-bubble-text);
            border-bottom-left-radius: 0.5rem;
        }

        .gemini-message {
            align-self: flex-start;
            align-items: flex-start;
            width: 85%;
            max-width: 85%;
        }
        .gemini-message .message-bubble {
            background-color: var(--gemini-bubble-bg);
            color: var(--gemini-bubble-text);
            border: 1px solid var(--gemini-bubble-border);
            border-bottom-left-radius: 0.5rem;
        }
        .gemini-mood, .gemini-actionable-step {
            font-style: italic;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px dashed var(--gemini-bubble-border);
        }
        .gemini-actionable-step {
            margin-top: 0.75rem;
            padding-top: 0.75rem;
            border-top: 1px dashed var(--gemini-bubble-border);
            border-bottom: none;
        }
        
        /* Message Input Form */
        .chat-form-container {
            padding: 1rem 1.5rem;
            border-top: 1px solid var(--border-color);
            background-color: var(--surface);
        }

        .chat-form {
            display: flex;
            gap: 0.75rem;
            align-items: center;
        }

        #message-input {
            flex-grow: 1;
            padding: 0.75rem 1rem;
            border-radius: 9999px;
            border: 1px solid var(--border-color);
            background-color: var(--background);
            color: var(--text-dark);
            font-family: 'Inter', sans-serif;
            font-size: 1rem;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        #message-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-light);
        }

        .ai-button {
            flex-shrink: 0;
            padding: 0.5rem;
            border: 1px solid var(--border-color);
            background-color: var(--surface);
            color: var(--text-light);
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: all 0.2s ease;
        }
        .ai-button:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        #send-button {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border: none;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: background-color 0.2s ease;
        }
        #send-button:hover {
            background-color: #2563eb;
        }
        #send-button svg {
            width: 20px;
            height: 20px;
        }

        .message-actions {
            margin-top: 0.75rem;
            display: flex;
            gap: 0.5rem;
        }

        .reflect-button, .listen-button {
            padding: 0.25rem 0.75rem;
            font-size: 0.75rem;
            font-weight: 500;
            background-color: rgba(0,0,0,0.05);
            border: 1px solid rgba(0,0,0,0.1);
            border-radius: 999px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
        }
        .reflect-button:hover, .listen-button:hover {
            background-color: rgba(0,0,0,0.1);
            border-color: rgba(0,0,0,0.2);
        }
        
        .loading-spinner {
            border: 2px solid #f3f3f3;
            border-top: 2px solid var(--primary);
            border-radius: 50%;
            width: 16px;
            height: 16px;
            animation: spin 1s linear infinite;
            display: inline-block;
            vertical-align: middle;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }