frontend/css/style.css

:root {
    --primary-color: #0F766E;
    --secondary-color: #14B8A6;
    --bg-light: #FFFFFF;
    --bg-dark: #1a1a1a;
    --text-light: #000000;
    --text-dark: #FFFFFF;
    --border-light: #E5E7EB;
    --border-dark: #404040;
    --message-user-light: #DBEAFE;
    --message-user-dark: #1E40AF;
    --message-assistant-light: #F3F4F6;
    --message-assistant-dark: #2D2D2D;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-light);
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

.container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-light);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow-y: auto;
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .sidebar {
    background-color: #0a0a0a;
    border-right-color: var(--border-dark);
}

.logo-section {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
}

body.dark-mode .logo-section {
    border-bottom-color: var(--border-dark);
}

.logo {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-bottom: 10px;
}

.logo-section h1 {
    font-size: 24px;
    color: var(--primary-color);
}

.new-chat-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    transition: background-color 0.3s;
}

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

.conversations-list {
    flex: 1;
    margin-bottom: 20px;
}

.conversations-list h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: #999;
    margin-bottom: 10px;
}

#conversations-container {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.conversation-item {
    padding: 10px;
    background-color: var(--message-assistant-light);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-size: 13px;
    word-break: break-word;
}

body.dark-mode .conversation-item {
    background-color: var(--message-assistant-dark);
}

.conversation-item:hover {
    background-color: var(--border-light);
}

body.dark-mode .conversation-item:hover {
    background-color: #404040;
}

.sidebar-footer {
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
}

body.dark-mode .sidebar-footer {
    border-top-color: var(--border-dark);
}

.settings-btn {
    width: 100%;
    padding: 10px;
    background-color: transparent;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

body.dark-mode .settings-btn {
    border-color: var(--border-dark);
}

.settings-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

body.dark-mode .chat-area {
    background-color: var(--bg-dark);
}

.chat-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s;
}

body.dark-mode .chat-header {
    border-bottom-color: var(--border-dark);
}

.header-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

#language-select, .theme-toggle {
    padding: 8px 12px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background-color: var(--bg-light);
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s;
}

body.dark-mode #language-select,
body.dark-mode .theme-toggle {
    background-color: #2D2D2D;
    border-color: var(--border-dark);
    color: var(--text-dark);
}

#language-select:hover, .theme-toggle:hover {
    border-color: var(--primary-color);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.welcome-message {
    text-align: center;
    padding: 40px;
    color: #999;
}

.welcome-message img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    border-radius: 50%;
}

.welcome-message h2 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.message {
    display: flex;
    gap: 10px;
    animation: slideIn 0.3s ease-in;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    word-wrap: break-word;
    line-height: 1.5;
}

.user .message-content {
    background-color: var(--message-user-light);
    color: #000;
    border-bottom-right-radius: 4px;
}

body.dark-mode .user .message-content {
    background-color: var(--message-user-dark);
    color: white;
}

.assistant .message-content {
    background-color: var(--message-assistant-light);
    color: #000;
    border-bottom-left-radius: 4px;
    position: relative;
}

body.dark-mode .assistant .message-content {
    background-color: var(--message-assistant-dark);
    color: #fff;
}

/* Code Block Styling */
.message-content pre {
    background-color: #1e1e1e;
    color: #d4d4d4;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 10px 0;
    position: relative;
}

.message-content code {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.5;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 6px 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.3s;
}

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

/* Tables */
.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 10px 0;
    border: 1px solid #ddd;
}

body.dark-mode .message-content table {
    border-color: #444;
}

.message-content th,
.message-content td {
    padding: 10px;
    text-align: left;
    border: 1px solid #ddd;
}

body.dark-mode .message-content th,
body.dark-mode .message-content td {
    border-color: #444;
}

.message-content th {
    background-color: #f0f0f0;
    font-weight: 600;
}

body.dark-mode .message-content th {
    background-color: #333;
}

/* Input Area */
.input-area {
    display: flex;
    gap: 10px;
    padding: 20px;
    border-top: 1px solid var(--border-light);
    background-color: var(--bg-light);
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .input-area {
    background-color: #0a0a0a;
    border-top-color: var(--border-dark);
}

#message-input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    max-height: 100px;
    background-color: var(--bg-light);
    color: var(--text-light);
    transition: all 0.3s;
}

body.dark-mode #message-input {
    background-color: #2D2D2D;
    border-color: var(--border-dark);
    color: var(--text-dark);
}

#message-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.1);
}

.send-btn {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--secondary-color);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--bg-light);
    padding: 0;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

body.dark-mode .modal-content {
    background-color: #1a1a1a;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s;
}

body.dark-mode .modal-header {
    border-bottom-color: var(--border-dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: #999;
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-weight: 600;
    font-size: 14px;
}

.setting-item select,
.setting-item input {
    padding: 10px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background-color: var(--bg-light);
    color: var(--text-light);
    transition: all 0.3s;
}

body.dark-mode .setting-item select,
body.dark-mode .setting-item input {
    background-color: #2D2D2D;
    border-color: var(--border-dark);
    color: var(--text-dark);
}

.setting-item input[type="range"] {
    cursor: pointer;
}

.clear-history-btn {
    padding: 10px;
    background-color: #EF4444;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.clear-history-btn:hover {
    background-color: #DC2626;
}

/* Loading Indicator */
.loading {
    position: fixed;
    bottom: 100px;
    right: 30px;
    z-index: 999;
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

body.dark-mode .spinner {
    border-color: var(--border-dark);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: var(--border-dark);
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        max-height: 200px;
        overflow-x: auto;
        flex-direction: row;
    }
    
    .conversations-list {
        display: none;
    }
    
    .message-content {
        max-width: 90%;
    }
}