/* Basic Dark Mode Theme Variables */
:root {
    --dm-font-family: 'Consolas', 'Menlo', 'Monaco', 'Courier New', monospace;

    --dm-bg-body: #121212;              /* Deep dark grey for the page background */
    --dm-bg-container: #1e1e1e;         /* Dark grey for the main chat container */
    --dm-bg-chat-history: var(--dm-bg-container); /* Background for the chat history panel */
    --dm-bg-input-area: #1a1a1a;        /* Background for the chat input area */
    --dm-bg-input-field: #2c2c2c;       /* Background for the text input field */

    --dm-text-primary: #e0e0e0;         /* Light grey for main text content */
    --dm-text-input-placeholder: #757575; /* Grey for placeholder text in the input field */
    --dm-text-on-accent: #ffffff;       /* White text for use on colored buttons/messages */

    --dm-border-primary: #333333;       /* Subtle dark grey for borders */
    --dm-border-input-focus: #007bff;   /* Blue for input field focus highlight */

    --dm-accent-blue: #007bff;          /* Primary accent color (e.g., Send button) */
    --dm-accent-blue-hover: #0056b3;    /* Darker blue for hover on primary accent */

    --dm-accent-green: #28a745;         /* Secondary accent color (e.g., Upload button) */
    --dm-accent-green-hover: #1e7e34;   /* Darker green for hover on secondary accent */

    --dm-user-message-bg: #005f99;      /* A distinct darker blue for user messages */
    --dm-bot-message-bg: #303030;       /* Dark grey for bot messages, slightly lighter than container */

    --dm-scrollbar-track: #2c2c2c;      /* Scrollbar track color */
    --dm-scrollbar-thumb: #555555;      /* Scrollbar thumb color */
    --dm-scrollbar-thumb-hover: #777777;/* Scrollbar thumb color on hover */
}

body {
    font-family: var(--dm-font-family);
    background-color: var(--dm-bg-body);
    color: var(--dm-text-primary);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-size: 16px;
}

.chat-container {
    width: 90%;
    max-width: 800px;
    height: 90vh;
    max-height: 700px;
    background-color: var(--dm-bg-container);
    border: 1px solid var(--dm-border-primary);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4); /* Slightly adjusted shadow for dark theme */
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-history {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    background-color: var(--dm-bg-chat-history);
    border-bottom: 1px solid var(--dm-border-primary);
}

.message {
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.4;
    max-width: 80%;
    word-wrap: break-word;
}

.user-message {
    background-color: var(--dm-user-message-bg);
    color: var(--dm-text-on-accent);
    margin-left: auto;
    border-bottom-right-radius: 5px;
}

.bot-message {
    background-color: var(--dm-bot-message-bg);
    color: var(--dm-text-primary);
    margin-right: auto;
    border-bottom-left-radius: 5px;
}

.chat-input-area {
    display: flex;
    padding: 15px;
    background-color: var(--dm-bg-input-area);
    border-top: 1px solid var(--dm-border-primary);
}

#userInput {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid var(--dm-border-primary);
    border-radius: 20px;
    background-color: var(--dm-bg-input-field);
    color: var(--dm-text-primary);
    font-family: var(--dm-font-family);
    font-size: 1em;
    margin-right: 10px;
}

#userInput::placeholder {
    color: var(--dm-text-input-placeholder);
}

#userInput:focus {
    outline: none;
    border-color: var(--dm-border-input-focus);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); /* Adjusted focus shadow */
}

button {
    padding: 10px 20px;
    background-color: var(--dm-accent-blue);
    color: var(--dm-text-on-accent);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-family: var(--dm-font-family);
    font-size: 1em;
    transition: background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

button:hover {
    background-color: var(--dm-accent-blue-hover);
}

button:active { /* Optional: style for when button is clicked */
    transform: translateY(1px);
}

#uploadButton {
    margin-left: 10px;
    background-color: var(--dm-accent-green);
}

#uploadButton:hover {
    background-color: var(--dm-accent-green-hover);
}

/* For nicer scrollbars (optional, WebKit specific) */
.chat-history::-webkit-scrollbar {
    width: 10px; /* Slightly wider for easier interaction */
}

.chat-history::-webkit-scrollbar-track {
    background: var(--dm-scrollbar-track);
    border-radius: 5px;
}

.chat-history::-webkit-scrollbar-thumb {
    background: var(--dm-scrollbar-thumb);
    border-radius: 5px;
    border: 2px solid var(--dm-scrollbar-track); /* Creates a nice padding effect */
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--dm-scrollbar-thumb-hover);
}