:root {
    /* Light mode colors */
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --header-bg: #e9ecef;
    --text-color: #333333;
    --input-bg: #f5f5f5;
    --input-border: #cccccc;
    --send-button-bg: #007bff;
    --send-button-hover-bg: #0056b3;
    --voice-button-bg: #28a745; /* Green for main voice button */
    --voice-button-hover-bg: #218838;
    --transcribe-button-bg: #6f42c1; /* Purple for transcribe button */
    --transcribe-button-hover-bg: #5a359e;
    --file-upload-bg: #ffc107;
    --file-upload-hover-bg: #e0a800;
    --bot-message-bg: #e0e0e0;
    --bot-message-text: #333333;
    --user-message-bg: #007bff;
    --user-message-text: #ffffff;
    --message-box-success-bg: #d4edda;
    --message-box-success-text: #155724;
    --message-box-error-bg: #f8d7da;
    --message-box-error-text: #721c24;
    --message-box-info-bg: #cfe2ff;
    --message-box-info-text: #052c65;
    --loading-color: #007bff;
    --border-radius-main: 12px;
    --border-radius-elements: 8px;
    --new-chat-button-bg: #6c757d;
    --new-chat-button-hover-bg: #5a6268;
    --icon-button-bg: #5a6268; /* New: for theme toggle icon */
    --icon-button-hover-bg: #4f535a;
    --file-tag-bg: #e0e0e0;
    --file-tag-text: #333333;
    --file-tag-remove-hover: #dc3545;
    --body-background-image: url('https://images.unsplash.com/photo-1698650702202-b2586e92789f?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3w1MDcxMzJ8MHwxfHNlYXJjaHw1fHxtaW5pbWFsaXN0JTIwZ2VvbWV0cmljJTIwcGF0dGVybnxlbnwwfHx8fDE3MTc4MDIwMjF8MA&ixlib=rb-4.0.3&q=80&w=1080'); /* Subtle geometric pattern */
}

body.dark-mode {
    /* Dark mode colors */
    --bg-color: #282c34;
    --container-bg: #3c4048;
    --header-bg: #4f535a;
    --text-color: #e0e0e0;
    --input-bg: #21252b;
    --input-border: #555555;
    --send-button-bg: #61afef;
    --send-button-hover-bg: #4c92db;
    --voice-button-bg: #98c379;
    --voice-button-hover-bg: #7cb859;
    --transcribe-button-bg: #a06de5; /* Lighter purple for transcribe button */
    --transcribe-button-hover-bg: #8c57cf;
    --file-upload-bg: #e5c07b;
    --file-upload-hover-bg: #d4ac61;
    --bot-message-bg: #4f535a;
    --bot-message-text: #e0e0e0;
    --user-message-bg: #61afef;
    --user-message-text: #ffffff;
    --message-box-success-bg: #3c4048;
    --message-box-success-text: #98c379;
    --message-box-error-bg: #3c4048;
    --message-box-error-text: #e06c75;
    --message-box-info-bg: #3c4048;
    --message-box-info-text: #61afef;
    --loading-color: #61afef;
    --new-chat-button-bg: #5a6268;
    --new-chat-button-hover-bg: #4f535a;
    --icon-button-bg: #4f535a;
    --icon-button-hover-bg: #3c4048;
    --file-tag-bg: #5a6268;
    --file-tag-text: #e0e0e0;
    --file-tag-remove-hover: #e06c75;
    --body-background-image: url('https://images.unsplash.com/photo-1698650702202-b2586e92789f?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3w1MDcxMzJ8MHwxfHNlYXJjaHw1fHxtaW5pbWFsaXN0JTIwZ2VvbWV0cmljJTIwcGF0dGVybnxlbnwwfHx8fDE3MTc4MDIwMjF8MA&ixlib=rb-4.0.3&q=80&w=1080'); /* Same image, adjust opacity or overlay if needed */
}

body {
    font-family: 'Inter', sans-serif;
    margin: 5px; /* Reduced margin */
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    background-image: var(--body-background-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed; /* Keeps image fixed during scroll */
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    overflow-y: auto; /* Enable scrolling for the body */
}

.chat-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 850px; /* Increased max-width */
    height: 99vh; /* Increased height */
    background-color: var(--container-bg);
    border-radius: var(--border-radius-main);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin: 5px; /* Reduced margin */
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--input-border);
    color: var(--text-color);
    flex-shrink: 0; /* Prevent header from shrinking */
    flex-wrap: wrap; /* Allow wrapping of controls */
    gap: 15px; /* Space between header items */
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px; /* Reduced gap for more compact settings */
    flex-wrap: wrap;
    justify-content: flex-end; /* Align to the right */
}

.settings-group { /* New class to group theme, voice, language selectors */
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.logo-area {
    display: flex;
    flex-direction: row; /* Align logo and text horizontally */
    align-items: center;
    gap: 10px; /* Space between logo and text */
    text-align: left; /* Align text to left */
}

.chat-logo {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    margin-bottom: 0; /* Remove margin-bottom */
}

.app-greeting {
    font-size: 0.9em;
    line-height: 1.3;
    margin: 0;
    font-weight: 400;
}

.app-greeting p {
    margin: 0;
}

.new-chat-button {
    background-color: var(--new-chat-button-bg);
    color: white;
    padding: 8px 12px; /* Slightly smaller button */
    border: none;
    border-radius: var(--border-radius-elements);
    cursor: pointer;
    font-size: 0.9em; /* Smaller font size */
    display: flex;
    align-items: center;
    gap: 6px; /* Smaller gap for icon */
    transition: background-color 0.3s, transform 0.2s;
}

.new-chat-button:hover {
    background-color: var(--new-chat-button-hover-bg);
    transform: translateY(-1px);
}

.icon-button { /* New base style for icon buttons like theme toggle */
    background-color: var(--icon-button-bg);
    color: white;
    border: none;
    padding: 8px; /* Square button, slightly smaller */
    border-radius: var(--border-radius-elements);
    cursor: pointer;
    font-size: 1em; /* Smaller icon size */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.2s;
    flex-shrink: 0;
}

.icon-button:hover {
    background-color: var(--icon-button-hover-bg);
    transform: translateY(-1px);
}


.settings-select { /* Unified class for language and voice selects */
    padding: 8px 10px;
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-elements);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 0.9em;
    cursor: pointer;
    outline: none;
    transition: border-color 0.3s, background-color 0.3s;
    min-width: 100px; /* Ensure they don't collapse too much */
}

.settings-select:focus {
    border-color: var(--send-button-bg);
}

/* Voice selection dropdown in header */
.voice-selection {
    display: flex;
    align-items: center;
    gap: 5px;
}
.voice-selection label { /* Visually hidden label */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}


.chat-box {
    flex-grow: 1; /* Allows chat area to take available space */
    padding: 20px;
    overflow-y: auto;
    background-color: var(--container-bg);
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--send-button-bg) var(--input-bg); /* Firefox */
}

.chat-box::-webkit-scrollbar {
    width: 8px;
}

.chat-box::-webkit-scrollbar-track {
    background: var(--input-bg);
}

.chat-box::-webkit-scrollbar-thumb {
    background-color: var(--send-button-bg);
    border-radius: 10px;
    border: 2px solid var(--container-bg);
}

.message {
    max-width: 80%;
    padding: 10px 15px;
    border-radius: var(--border-radius-elements);
    margin-bottom: 10px;
    line-height: 1.5;
    word-wrap: break-word; /* Ensure long words wrap */
}

.user-message {
    background-color: var(--user-message-bg);
    color: var(--user-message-text);
    margin-left: auto; /* Align to right */
    border-bottom-right-radius: 2px; /* For a sharp edge at the corner */
}

.bot-message {
    background-color: var(--bot-message-bg);
    color: var(--bot-message-text);
    margin-right: auto; /* Align to left */
    border-bottom-left-radius: 2px; /* For a sharp edge at the corner */
}

/* New CSS to style Markdown elements within bot messages */
.bot-message p {
    margin: 0 0 0.5em 0; /* Adjust paragraph spacing */
}

.bot-message h1, .bot-message h2, .bot-message h3, .bot-message h4, .bot-message h5, .bot-message h6 {
    color: var(--text-color);
    margin-top: 1em;
    margin-bottom: 0.5em;
}

.bot-message h1 { font-size: 1.5em; border-bottom: 1px solid var(--input-border); padding-bottom: 0.3em; }
.bot-message h2 { font-size: 1.3em; }
.bot-message h3 { font-size: 1.1em; }

.bot-message ul, .bot-message ol {
    margin: 0.5em 0 0.5em 20px;
    padding: 0;
}

.bot-message li {
    margin-bottom: 0.3em;
}

.bot-message pre {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-elements);
    padding: 10px;
    overflow-x: auto;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.9em;
    margin-top: 0.8em;
    margin-bottom: 0.8em;
}

.bot-message code {
    background-color: rgba(0, 0, 0, 0.05); /* Light background for inline code */
    padding: 2px 4px;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.9em;
}

.dark-mode .bot-message code {
    background-color: rgba(255, 255, 255, 0.1); /* Dark background for inline code */
}

.bot-message blockquote {
    border-left: 4px solid var(--send-button-bg);
    padding-left: 15px;
    margin: 0.8em 0;
    color: var(--text-color);
    opacity: 0.8;
}

.bot-message a {
    color: var(--send-button-bg);
    text-decoration: underline;
}


/* Controls area *above* the input field */
.chat-controls-area {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    background-color: var(--header-bg);
    border-top: 1px solid var(--input-border);
    flex-wrap: wrap;
    flex-shrink: 0;
}

.chat-input-area {
    padding: 15px 20px;
    background-color: var(--header-bg);
    border-top: 1px solid var(--input-border);
    flex-shrink: 0; /* Prevent footer from shrinking */
}

/* Uploaded Files Display Area */
.uploaded-files-display {
    display: flex;
    flex-wrap: wrap;
    gap: 8px; /* Space between file tags */
    padding: 5px 0 10px; /* Padding above input field */
    min-height: 0; /* Allow to shrink when no files */
    max-height: 100px; /* Limit height to avoid taking too much space */
    overflow-y: auto; /* Scroll if too many files */
    border-bottom: 1px solid transparent; /* Placeholder for visual consistency */
    margin-bottom: 5px;
    transition: border-color 0.3s;
}

.uploaded-files-display.has-files {
    border-color: var(--input-border); /* Show border when files are present */
}

.file-tag {
    display: flex;
    align-items: center;
    background-color: var(--file-tag-bg);
    color: var(--file-tag-text);
    padding: 6px 8px;
    border-radius: 15px; /* Pill shape */
    font-size: 0.8em;
    gap: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px; /* Limit width of individual tags */
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.file-tag .file-icon {
    font-size: 1.1em;
    flex-shrink: 0;
}

.file-tag .file-name {
    flex-grow: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-tag .remove-file {
    cursor: pointer;
    color: #888;
    margin-left: 5px;
    font-size: 0.9em;
    transition: color 0.2s;
    flex-shrink: 0;
}

.file-tag .remove-file:hover {
    color: var(--file-tag-remove-hover);
}

/* Styles for file tags within messages */
.message-files-container {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
}

.message-file-tag {
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.2); /* Semi-transparent white for contrast */
    color: inherit; /* Inherit text color from parent message */
    padding: 4px 8px;
    border-radius: 10px;
    font-size: 0.75em;
    gap: 4px;
    white-space: nowrap;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.user-message .message-file-tag {
    background-color: rgba(255, 255, 255, 0.2); /* Adjust for user message background */
    color: white; /* Ensure visibility on blue background */
}
.bot-message .message-file-tag {
    background-color: rgba(0, 0, 0, 0.05); /* Adjust for bot message background */
    color: var(--bot-message-text);
}


.input-row {
    display: flex;
    align-items: flex-end; /* Align textarea and buttons at the bottom */
    gap: 10px;
    margin-bottom: 10px;
}

#userInput {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-elements);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1em;
    resize: none; /* Disable manual resize */
    min-height: 40px; /* Minimum height */
    max-height: 120px; /* Max height before scrolling */
    overflow-y: auto; /* Enable scrolling if content exceeds max-height */
    box-sizing: border-box; /* Include padding and border in element's total width and height */
    transition: border-color 0.3s, box-shadow 0.3s;
}

#userInput:focus {
    border-color: var(--send-button-bg);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
    outline: none;
}

/* General style for control buttons (Upload, Voice Mode, Transcribe) */
.control-button {
    border: none;
    padding: 6px 10px; /* Further reduced padding */
    border-radius: var(--border-radius-elements);
    cursor: pointer;
    font-size: 0.85em; /* Further reduced font size */
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px; /* Space between icon and text */
    transition: background-color 0.3s, transform 0.2s;
    flex-shrink: 0;
    white-space: nowrap;
    min-width: 90px; /* Adjusted min-width */
}

/* Specific styles for send button (not a .control-button) */
.send-button {
    border: none;
    padding: 10px 15px; /* Send button can be slightly larger */
    border-radius: var(--border-radius-elements);
    cursor: pointer;
    font-size: 1.1em;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.2s;
    flex-shrink: 0;
    background-color: var(--send-button-bg);
}

.send-button:hover {
    background-color: var(--send-button-hover-bg);
    transform: translateY(-1px);
}

/* Specific button colors for voice and upload */
.voice-button {
    background-color: var(--voice-button-bg);
}
.voice-button:hover {
    background-color: var(--voice-button-hover-bg);
    transform: translateY(-1px);
}
.voice-button.listening {
    background-color: #dc3545; /* Red when listening */
    animation: pulse 1s infinite alternate;
}

.transcribe-button { /* Using specific class for transcribe */
    background-color: var(--transcribe-button-bg);
}
.transcribe-button:hover {
    background-color: var(--transcribe-button-hover-bg);
    transform: translateY(-1px);
}
.transcribe-button.listening {
    background-color: #dc3545; /* Red when listening */
    animation: pulse 1s infinite alternate;
}


@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.05); }
}

.file-upload-button {
    background-color: var(--file-upload-bg);
}
.file-upload-button:hover {
    background-color: var(--file-upload-hover-bg);
    transform: translateY(-1px);
}

.status-message {
    margin-top: 5px;
    padding: 8px 12px;
    border-radius: var(--border-radius-elements);
    font-size: 0.85em;
    display: none; /* Hidden by default */
    text-align: center;
}

.upload-status.active {
    background-color: var(--message-box-info-bg);
    color: var(--message-box-info-text);
    display: block;
}

.voice-status.active {
    background-color: var(--message-box-info-bg);
    color: var(--message-box-info-text);
    display: block;
}

.message-box { /* Adjusted for better visibility */
    margin-top: 10px;
    padding: 15px 20px; /* Increased padding */
    min-height: 50px; /* Ensure minimum height */
    border-radius: var(--border-radius-elements);
    font-weight: bold;
    display: none; /* Hidden by default */
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1); /* Added subtle shadow */
}

.message-box.success {
    background-color: var(--message-box-success-bg);
    color: var(--message-box-success-text);
    display: block;
}

.message-box.error {
    background-color: var(--message-box-error-bg);
    color: var(--message-box-error-text);
    display: block;
}

.message-box.info {
    background-color: var(--message-box-info-bg);
    color: var(--message-box-info-text);
    display: block;
}


/* Loading indicator for bot response */
.loading-indicator {
    display: inline-block;
    width: 30px;
    height: 10px;
    position: relative;
}

.loading-indicator span {
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--loading-color);
    border-radius: 50%;
    animation: loading-dot 1.4s infinite ease-in-out both;
}

.loading-indicator span:nth-child(1) {
    left: 0;
    animation-delay: -0.32s;
}

.loading-indicator span:nth-child(2) {
    left: 12px;
    animation-delay: -0.16s;
}

.loading-indicator span:nth-child(3) {
    left: 24px;
    animation-delay: 0s;
}

@keyframes loading-dot {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}


/* Responsive adjustments */
@media (max-width: 600px) {
    body {
        background-size: auto 100%; /* Adjust background for mobile */
        background-position: top center;
    }
    .chat-container {
        height: 100vh; /* Full height on small screens */
        border-radius: 0; /* No rounded corners */
        margin: 0;
    }

    .chat-header {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px;
        gap: 8px;
    }

    .header-right {
        width: 100%;
        justify-content: space-between; /* Distribute controls horizontally */
    }
    .settings-group {
        width: 100%;
        justify-content: space-between;
    }
    .voice-selection, .settings-select, .icon-button { /* Unified class for language and voice selects */
        flex-grow: 1; /* Allow dropdowns and icons to take more space */
        min-width: unset; /* Remove min-width on mobile */
    }

    .app-greeting {
        font-size: 0.85em;
    }

    /* Adjust control buttons for mobile */
    .chat-controls-area {
        flex-direction: column;
        padding: 10px;
    }
    .control-button {
        width: 100%;
        padding: 10px;
        font-size: 1em;
        min-width: unset; /* Remove min-width on mobile */
    }
    .send-button {
        width: 100%;
        padding: 12px;
    }
    #userInput {
        width: 100%; /* Full width for textarea */
        margin-top: 10px; /* Space from buttons above */
    }

    .uploaded-files-display {
        padding: 5px 0 10px;
        justify-content: center; /* Center align tags on mobile */
    }
    .file-tag {
        max-width: 100%; /* Allow tags to take full width */
    }
    .message-file-tag {
        font-size: 0.7em; /* Smaller on mobile messages */
        padding: 3px 6px;
    }
}