/* CSS Variables for Theming */
:root {
    --background-color: #f5f5f5;
    --text-color: #333333;
    --header-background: #ffffff;
    --header-text-color: #333333;
    --sidebar-background: #ffffff;
    --sidebar-text-color: #333333;
    --button-background: #007bff;
    --button-hover-background: #0056b3;
    --secondary-button-background: #6c757d;
    --secondary-button-hover-background: #5a6268;
    --danger-button-background: #dc3545;
    --danger-button-hover-background: #c82333;
    --input-background: #ffffff;
    --input-border-color: #ced4da;
    --message-user-bg: #dcf8c6;
    --message-bot-bg: #f1f0f0;
    --chat-background: #ffffff;
    --toggle-bg: #ccc;
    --toggle-thumb: #ffffff;
    --conversation-hover-bg: #f0f0f0;
    --active-conversation-bg: #e0e0e0;
}

body.dark-mode {
    --background-color: #1e1e1e;
    --text-color: #e0e0e0;
    --header-background: #2c2c2c;
    --header-text-color: #e0e0e0;
    --sidebar-background: #2c2c2c;
    --sidebar-text-color: #e0e0e0;
    --button-background: #0d6efd;
    --button-hover-background: #0b5ed7;
    --secondary-button-background: #6c757d;
    --secondary-button-hover-background: #5a6268;
    --danger-button-background: #dc3545;
    --danger-button-hover-background: #c82333;
    --input-background: #3a3a3a;
    --input-border-color: #555555;
    --message-user-bg: #2b3939;
    --message-bot-bg: #3a3a3a;
    --chat-background: #1e1e1e;
    --toggle-bg: #555;
    --toggle-thumb: #ffffff;
    --conversation-hover-bg: #3a3a3a;
    --active-conversation-bg: #4a4a4a;
}

/* General Styles */
body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-background);
    color: var(--sidebar-text-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
    border-right: 1px solid var(--input-border-color);
    transition: background-color 0.3s, color 0.3s;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.sidebar-header h1 {
    font-size: 1.5em;
    display: flex;
    align-items: center;
}

.sidebar-header h1 i {
    margin-right: 10px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    font-size: 1.2em;
}

.theme-toggle i {
    margin: 0 5px;
}

/* Switch Styles */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-bg);
    transition: 0.4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--toggle-thumb);
    transition: 0.4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--button-background);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Authentication Sections */
.auth-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-section h2 {
    text-align: center;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    background-color: var(--input-background);
    color: var(--text-color);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.form-group input::placeholder {
    color: #888;
}

.button-group {
    display: flex;
    justify-content: space-between;
}

.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.primary-btn {
    background-color: var(--button-background);
    color: #ffffff;
}

.primary-btn:hover {
    background-color: var(--button-hover-background);
}

.secondary-btn {
    background-color: var(--secondary-button-background);
    color: #ffffff;
}

.secondary-btn:hover {
    background-color: var(--secondary-button-hover-background);
}

/* Conversations Section */
.conversations-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.conversations-section h2 {
    margin-bottom: 10px;
    font-size: 1.2em;
    text-align: center;
}

.conversation-list {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    background-color: var(--input-background);
    transition: background-color 0.3s, border-color 0.3s;
}

.conversation-list li {
    padding: 10px 15px;
    cursor: pointer;
    border-bottom: 1px solid var(--input-border-color);
    transition: background-color 0.3s;
}

.conversation-list li:last-child {
    border-bottom: none;
}

.conversation-list li:hover {
    background-color: var(--conversation-hover-bg);
}

.conversation-list li.active {
    background-color: var(--active-conversation-bg);
}

.conversation-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
}

.icon-btn {
    background: none;
    color: var(--text-color);
    font-size: 1.2em;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
}

.icon-btn:hover {
    background-color: var(--input-border-color);
    color: var(--button-background);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--chat-background);
    transition: background-color 0.3s;
}

/* Chat Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--header-background);
    border-bottom: 1px solid var(--input-border-color);
    transition: background-color 0.3s;
}

.chat-header h2 {
    margin: 0;
    font-size: 1.2em;
}

.chat-controls {
    display: flex;
    align-items: center;
}

.chat-controls button,
.chat-controls select {
    margin-left: 10px;
}

.chat-controls select {
    padding: 8px;
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    background-color: var(--input-background);
    color: var(--text-color);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background-color: var(--chat-background);
}

.message {
    max-width: 70%;
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 20px;
    position: relative;
    word-wrap: break-word;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: background-color 0.3s, color 0.3s;
}

.user-message {
    background-color: var(--message-user-bg);
    align-self: flex-end;
    color: var(--text-color);
}

.bot-message {
    background-color: var(--message-bot-bg);
    align-self: flex-start;
    color: var(--text-color);
}

/* Chat Input */
.chat-input {
    display: flex;
    padding: 15px 20px;
    border-top: 1px solid var(--input-border-color);
    background-color: var(--header-background);
    transition: background-color 0.3s;
}

.chat-input textarea {
    flex: 1;
    resize: none;
    padding: 10px 15px;
    border: 1px solid var(--input-border-color);
    border-radius: 20px;
    background-color: var(--input-background);
    color: var(--text-color);
    font-size: 1em;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.chat-input textarea::placeholder {
    color: #888;
}

.send-btn {
    background-color: var(--button-background);
    color: #ffffff;
    margin-left: 10px;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.send-btn:hover {
    background-color: var(--button-hover-background);
}

/* Scrollbar Styling */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--chat-background);
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--input-border-color);
    border-radius: 4px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .app-container {
        flex-direction: column;
    }

    .chat-main {
        flex: 1;
    }
}