/* Define CSS Variables for Light and Dark Themes */
:root {
    /* General */
    --chatbot-container-bg: #f7f7f7;
    --chatbot-container-border: #e0e0e0;
    --chatbot-container-shadow: 0 5px 15px rgba(0,0,0,0.08);
    --chatbot-text-general: #2c3e50;
    --chatbot-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    --border-radius-base: 8px;
    --border-radius-large: 12px;
    --border-radius-round: 20px;

    /* Chat Window */
    --chat-window-bg: #ffffff;
    --chat-window-padding: 15px;

    /* Messages */
    --message-user-bg: #007bff;
    --message-user-text: #ffffff;
    --message-ai-bg: #f1f3f5;
    --message-ai-text: #2c3e50;
    --message-system-bg: #e9ecef;
    --message-system-text: #495057;
    --message-typing-indicator-text: #6c757d;
    --message-error-bg: #f8d7da;
    --message-error-text: #721c24;
    --message-border-radius: 18px;
    --message-padding: 10px 15px;
    --message-border: 1px solid #dee2e6;
    --message-box-shadow: 0 1px 2px rgba(0,0,0,0.05);

    /* Form & Input */
    --form-bg: #f8f9fa;
    --form-border-top: #dee2e6;
    --input-bg: #ffffff;
    --input-text: #495057;
    --input-border: #ced4da;
    --input-focus-border: #80bdff;
    --input-focus-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
    --input-border-radius: var(--border-radius-round);

    /* Buttons */
    --button-primary-bg: #007bff;
    --button-primary-text: #ffffff;
    --button-primary-hover-bg: #0056b3;
    --button-generate-bg: #28a745;
    --button-generate-hover-bg: #218838;
    --button-preset-bg: #e9ecef;
    --button-preset-text: #495057;
    --button-preset-border: #ced4da;
    --button-preset-hover-bg: #dde2e6;
    --button-border-radius: var(--border-radius-round);

    /* Specific UDAP Message Styles (outside chatbot) */
    --udap-message-bg: var(--message-ai-bg);
    --udap-message-border: var(--input-border);

    /* Specific UDAP AI Prompt Styles */
    --udap-prompt-bg: #e9f5ff;
    --udap-prompt-border: #b3d7ff;
    --udap-prompt-h4-text: #0056b3;
    --udap-prompt-pre-bg: #ffffff;
    --udap-prompt-pre-border: #ced4da;
    --udap-prompt-pre-text: #212529;

    /* Theme Toggle Button */
    --toggle-button-bg: transparent;
    --toggle-button-text: #6c757d;
    --toggle-button-hover-text: #007bff;
}

.dark-mode {
    /* General */
    --chatbot-container-bg: #2c2f33; 
    --chatbot-container-border: #495057;
    --chatbot-container-shadow: 0 4px 12px rgba(0,0,0,0.25);
    --chatbot-text-general: #f8f9fa;

    /* Chat Window */
    --chat-window-bg: #23272a;

    /* Messages */
    --message-user-bg: #007bff; 
    --message-user-text: #ffffff;
    --message-ai-bg: #3a3f44;
    --message-ai-text: #e0e6ed;
    --message-system-bg: #343a40;
    --message-system-text: #adb5bd;
    --message-typing-indicator-text: #adb5bd;
    --message-error-bg: #5d1f1f; 
    --message-error-text: #f5c6cb;
    --message-border: 1px solid #495057;

    /* Form & Input */
    --form-bg: #2c2f33;
    --form-border-top: #495057;
    --input-bg: #3a3f44;
    --input-text: #f8f9fa;
    --input-border: #495057;
    --input-focus-border: #007bff;

    /* Buttons */
    --button-primary-bg: #007bff;
    --button-primary-text: #ffffff;
    --button-primary-hover-bg: #0056b3;
    --button-generate-bg: #218838; 
    --button-generate-hover-bg: #1e7e34;
    --button-preset-bg: #3a3f44;
    --button-preset-text: #e0e6ed;
    --button-preset-border: #5a6268;
    --button-preset-hover-bg: #495057;

    /* Specific UDAP Message Styles */
    --udap-message-bg: #3a3f44;
    --udap-message-border: #495057;

    /* Specific UDAP AI Prompt Styles */
    --udap-prompt-bg: #2c3e50;
    --udap-prompt-border: #34495e;
    --udap-prompt-h4-text: #5dade2;
    --udap-prompt-pre-bg: #23272a;
    --udap-prompt-pre-border: #495057;
    --udap-prompt-pre-text: #f8f9fa;

    /* Theme Toggle Button */
    --toggle-button-text: #adb5bd;
    --toggle-button-hover-text: #ffffff;
}

/* --- Toggle Switch Styles --- */
.udap-history-toggle-container {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 8px 15px;
    background-color: var(--form-bg);
    border-top: 1px solid var(--form-border-top);
    gap: 10px;
}
.udap-history-toggle-container .toggle-label {
    font-size: 0.9em;
    color: var(--chatbot-text-general);
    font-weight: 500;
}
.udap-history-toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.udap-history-toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.udap-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}
.udap-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}
input:checked + .udap-slider {
    background-color: var(--button-primary-bg);
}
input:focus + .udap-slider {
    box-shadow: 0 0 1px var(--button-primary-bg);
}
input:checked + .udap-slider:before {
    transform: translateX(20px);
}
.udap-slider.round {
    border-radius: 24px;
}
.udap-slider.round:before {
    border-radius: 50%;
}

/* General transition for smooth theme changes */
.udap-chatbot-container, .udap-chat-window, .udap-chat-message,
.udap-chatbot-input, .udap-chatbot-form button, .udap-preset-bubble,
.theme-toggle-button, .udap-my-ai-prompt, .udap-my-ai-prompt pre {
    transition: background-color 0.25s ease-out, color 0.25s ease-out, border-color 0.25s ease-out, box-shadow 0.25s ease-out;
}

.udap-message {
    padding: 10px 15px;
    background-color: var(--udap-message-bg);
    border: 1px solid var(--udap-message-border);
    color: var(--chatbot-text-general); 
    border-radius: var(--border-radius-base);
    margin-bottom: 15px;
}

.udap-my-ai-prompt {
    padding: 15px;
    background-color: var(--udap-prompt-bg);
    border: 1px solid var(--udap-prompt-border);
    border-radius: var(--border-radius-base);
    margin-bottom: 20px;
}
.udap-my-ai-prompt h4 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--udap-prompt-h4-text);
}
.udap-my-ai-prompt pre {
    background-color: var(--udap-prompt-pre-bg);
    color: var(--udap-prompt-pre-text);
    padding: 10px;
    border: 1px solid var(--udap-prompt-pre-border);
    border-radius: 4px;
    white-space: pre-wrap; 
    word-wrap: break-word; 
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    max-height: 300px;
    overflow-y: auto;
}

/* --- MODIFIED: Chatbot container styles --- */
.udap-chatbot-container {
    width: 100%; /* Be full-width by default. */
    max-width: 700px; /* But don't exceed 700px on large screens. Adjust as you like. */
    height: 90vh; /* Set height to 90% of the viewport's height. */
    max-height: 850px; /* A fallback to prevent it from being excessively tall on huge monitors. */
    margin: 20px auto;
    background-color: var(--chatbot-container-bg);
    color: var(--chatbot-text-general);
    border: 1px solid var(--chatbot-container-border);
    border-radius: var(--border-radius-large); 
    overflow: hidden; 
    font-family: var(--chatbot-font-family);
    box-shadow: var(--chatbot-container-shadow);
    display: flex;
    flex-direction: column;
}

.theme-toggle-button {
    background-color: var(--toggle-button-bg);
    color: var(--toggle-button-text);
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: var(--border-radius-base);
    margin: 10px 15px 0px auto; 
    font-size: 0.85em;
    display: block; 
}
.theme-toggle-button:hover {
    color: var(--toggle-button-hover-text);
}

/* --- MODIFIED: Chat window styles --- */
.udap-chat-window {
    flex-grow: 1; /* This is key: it tells the chat window to expand and fill the available space in the container. */
    overflow-y: auto;
    padding: var(--chat-window-padding);
    background-color: var(--chat-window-bg);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* The rest of your CSS file continues below without changes... */

.udap-chat-message {
    max-width: 80%;
    padding: var(--message-padding);
    border-radius: var(--message-border-radius);
    line-height: 1.5;
    word-wrap: break-word;
    position: relative;
    box-shadow: var(--message-box-shadow);
    border: var(--message-border);
}
.udap-chat-message strong {
    font-weight: 600;
}
.udap-chat-message.user {
    background-color: var(--message-user-bg);
    color: var(--message-user-text);
    align-self: flex-end;
    border-bottom-right-radius: var(--border-radius-base); 
}
.udap-chat-message.user .udap-chat-message-timestamp {
    color: rgba(255, 255, 255, 0.75); 
}
.udap-chat-message.ai,
.udap-chat-message.assistant {
    background-color: var(--message-ai-bg);
    color: var(--message-ai-text);
    align-self: flex-start;
    border-bottom-left-radius: var(--border-radius-base);
}
.udap-chat-message.ai .udap-chat-message-timestamp,
.udap-chat-message.assistant .udap-chat-message-timestamp {
    color: #888;
}
.dark-mode .udap-chat-message.ai .udap-chat-message-timestamp,
.dark-mode .udap-chat-message.assistant .udap-chat-message-timestamp {
    color: #aaa;
}
.udap-chat-message.system-message, 
.udap-chat-message.system-topic,
.udap-chat-message.ai.system-message {
    background-color: var(--message-system-bg);
    color: var(--message-system-text);
    font-size: 0.85em;
    text-align: center;
    align-self: center; 
    max-width: 90%;
    padding: 5px 10px;
    border-radius: var(--border-radius-base);
    box-shadow: none;
    border: none;
}
.udap-chat-message.typing-indicator {
    background-color: transparent; 
    color: var(--message-typing-indicator-text);
    font-style: italic;
    box-shadow: none;
    border: none;
}
.udap-chat-message.error,
.udap-chat-message.ai.error {
    background-color: var(--message-error-bg);
    color: var(--message-error-text);
    border: 1px solid var(--message-error-text);
    border-radius: var(--border-radius-base);
}
.udap-chat-message.udap-image-message {
    padding: 8px; 
    background-color: transparent;
    align-self: flex-start; 
    max-width: 95%; 
    border: none;
    box-shadow: none;
}
.udap-generated-image {
    display: block;
    max-width: 100%; 
    height: auto;
    border-radius: var(--border-radius-large);
    margin: 5px auto 0; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    border: 1px solid var(--chatbot-container-border);
}
.dark-mode .udap-generated-image {
    border-color: var(--chatbot-container-border);
}
.udap-chatbot-form {
    display: flex;
    padding: 15px; 
    border-top: 1px solid var(--form-border-top);
    background-color: var(--form-bg);
    align-items: center; 
}
.udap-chatbot-input {
    flex-grow: 1;
    padding: 12px 18px; 
    background-color: var(--input-bg);
    color: var(--input-text);
    border: 1px solid var(--input-border);
    border-radius: var(--input-border-radius);
    margin-right: 10px;
    font-size: 1em;
    line-height: 1.4; 
}
.udap-chatbot-input:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: var(--input-focus-shadow);
}
.udap-chatbot-form button[type="submit"] {
    padding: 12px 22px; 
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    border: none;
    border-radius: var(--button-border-radius);
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    white-space: nowrap; 
}
#udap-image-chatbot-form button[type="submit"] {
    background-color: var(--button-generate-bg);
}
#udap-image-chatbot-form button[type="submit"]:hover {
    background-color: var(--button-generate-hover-bg);
}
.udap-chatbot-form button[type="submit"]:hover {
    background-color: var(--button-primary-hover-bg);
}
.udap-preset-bubbles-container {
    display: flex;
    justify-content: center; 
    flex-wrap: wrap;
    padding: 10px 15px; 
    border-top: 1px solid var(--form-border-top);
    background-color: var(--chat-window-bg); 
    gap: 8px; 
}
.udap-preset-bubble {
    background-color: var(--button-preset-bg);
    color: var(--button-preset-text);
    border: 1px solid var(--button-preset-border);
    border-radius: var(--border-radius-round);
    padding: 6px 14px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}
.udap-preset-bubble:hover {
    background-color: var(--button-preset-hover-bg);
    box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}
.udap-chat-history-image-content img {
    max-width: 200px; 
    max-height: 150px;
    display: block;
    margin-top: 5px;
    border-radius: var(--border-radius-base);
    border: 1px solid var(--chatbot-container-border); 
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.dark-mode .udap-chat-history-image-content img {
    border-color: var(--chatbot-container-border); 
}
.udap-chat-message-timestamp {
    font-size: 0.7em;
    display: block;
    text-align: right;
    margin-top: 4px;
    opacity: 0.7;
}
.udap-chat-message.user .udap-chat-message-timestamp {
    text-align: right;
}
.udap-chat-message.ai .udap-chat-message-timestamp,
.udap-chat-message.assistant .udap-chat-message-timestamp {
    text-align: left;
}
.udap-dots span {
    opacity: 0;
    animation: udap-dot-opacity 1.2s infinite;
    display: inline-block; 
    width: 6px; 
    height: 6px; 
    background-color: currentColor; 
    border-radius: 50%;
    margin: 0 2px;
}
.udap-dots span:nth-child(2) { animation-delay: 0.25s; }
.udap-dots span:nth-child(3) { animation-delay: 0.5s; }
@keyframes udap-dot-opacity {
    0%, 100% { opacity: 0.3; transform: scale(0.7); }
    50% { opacity: 1; transform: scale(1); }
}
.udap-chat-message.udap-analysis-header {
    font-weight: bold;
    margin-top: 15px;
    margin-bottom: 5px;
    color: #555;
}
.dark-mode .udap-chat-message.udap-analysis-header {
    color: #bbb;
}
.udap-chat-message.udap-analysis-content {
    font-size: 0.95em;
    line-height: 1.6;
}
.udap-chat-message.udap-analysis-content ul {
    margin-left: 20px;
    padding-left: 0;
}
.udap-chat-message.udap-analysis-content li {
    margin-bottom: 5px;
}
.katex-error {
    color: white;
}
.udap-chat-message .katex {
    font-size: 1em;
    display: inline-block;
    max-width: 100%; 
    text-align: left; 
}
.udap-chat-message .katex-display {
    display: block; 
    overflow-x: auto; 
    overflow-y: hidden; 
    max-width: 100%; 
    padding: 0.5em 0; 
    margin: 0.5em 0; 
}
.udap-chat-message .katex-error {
    color: var(--message-error-text);
    background-color: var(--message-error-bg);
    padding: 5px;
    border-radius: 4px;
    display: block;
}
.dark-mode .udap-chatbot-input:focus {
    background-color: var(--input-bg);
    color: var(--input-text);
}
.udap-chatbot-container-full {
    max-width: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0 !important;
    border: none;
    background: transparent;
    box-shadow: none;
}
.udap-chat-window-full {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

/* --- NEW: Responsive rules for mobile devices --- */
@media (max-width: 768px) {
    .udap-chatbot-container {
        width: 100%;
        height: 100%; /* Take up the full height of its container on mobile */
        max-width: 100%;
        max-height: none; /* Remove max-height limit on mobile */
        margin: 0;
        border-radius: 0;
        border: none;
        box-shadow: none;
    }
}