:root {
    --sidebar-bg: #202123;
    --chat-bg: #343541;
    --input-bg: #40414f;
    --border-color: #4d4d4f;
    --text-primary: #ececf1;
    --text-secondary: #8e8ea0;
    --accent-color: #19c37d;
    --code-bg: #1e1e1e;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--chat-bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

/* Sidebar Styles */
.sidebar {
    background-color: var(--sidebar-bg);
    width: 260px;
    height: 100vh;
    border-right: 1px solid var(--border-color);
    transition: all 0.3s ease;
    flex-shrink: 0;
    position: relative;
    z-index: 1000;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 999;
}

.sidebar-overlay.show {
    display: block;
}

.new-chat-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px;
    border-radius: 6px;
    width: 100%;
    text-align: left;
    transition: all 0.2s;
}

.new-chat-btn:hover {
    background-color: rgba(255,255,255,0.1);
}

.mode-selector {
    background-color: var(--input-bg);
    border-radius: 8px;
    padding: 4px;
    display: inline-flex;
}

.mode-btn {
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn.active {
    background-color: var(--sidebar-bg);
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: relative;
    min-width: 0;
}

.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background-color: var(--chat-bg);
    scroll-behavior: smooth;
}

.messages-area::-webkit-scrollbar {
    width: 6px;
}

.message {
    max-width: 100%;
    padding: 20px;
    display: flex;
    gap: 16px;
    animation: fadeIn 0.3s ease;
}

.message.user {
    background-color: var(--chat-bg);
}

.message.assistant {
    background-color: #444654;
}

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

.message-wrapper {
    max-width: 100%;
    margin: 0 auto;
    width: 100%;
    display: flex;
    gap: 12px;
}

.avatar {
    width: 30px;
    height: 30px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
    font-size: 0.85rem;
    min-width: 30px;
}

.avatar.user {
    background-color: #5436da;
    color: white;
}

.avatar.assistant {
    background-color: var(--accent-color);
    color: white;
}

/* User message specific styling */
.message.user .message-content {
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-content {
    flex: 1;
    line-height: 1.5;
    min-width: 0;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* Markdown Styling for Assistant */
.message-content h1, .message-content h2, .message-content h3,
.message-content h4, .message-content h5, .message-content h6 {
    margin-top: 1em;
    margin-bottom: 0.4em;
    font-weight: 600;
    color: var(--text-primary);
}

.message-content p {
    margin-bottom: 0.8em;
}

.message-content ul, .message-content ol {
    margin-bottom: 0.8em;
    padding-left: 1.8em;
    font-size: 0.95rem;
}

.message-content li {
    margin-bottom: 0.2em;
}

.message-content strong {
    font-weight: 600;
    color: #fff;
}

.message-content code {
    font-family: 'JetBrains Mono', monospace;
    background-color: rgba(255,255,255,0.1);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

.message-content pre {
    background-color: var(--code-bg);
    border-radius: 6px;
    padding: 12px;
    overflow-x: auto;
    margin: 0.8em 0;
    position: relative;
    font-size: 0.85rem;
}

.message-content pre code {
    background-color: transparent;
    padding: 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

/* Code Block Header */
.code-block-wrapper {
    position: relative;
    margin: 1em 0;
}

.code-header {
    background-color: #2d2d2d;
    padding: 8px 16px;
    border-radius: 8px 8px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid #3d3d3d;
}

.code-header + pre {
    margin-top: 0;
    border-radius: 0 0 8px 8px;
}

.copy-code-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}

.copy-code-btn:hover {
    color: var(--text-primary);
}

/* Typing Cursor */
.typing-cursor {
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background-color: var(--accent-color);
    animation: blink 1s infinite;
    margin-left: 2px;
    vertical-align: text-bottom;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Input Area */
.input-container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    padding: 0 20px 20px;
}

.input-wrapper {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

.form-control {
    background-color: transparent;
    border: none;
    color: var(--text-primary);
    resize: none;
    max-height: 200px;
    box-shadow: none !important;
    font-size: 0.95rem;
}

.form-control:focus {
    background-color: transparent;
    color: var(--text-primary);
}

.form-control::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    transition: all 0.2s;
    padding: 8px;
}

.send-btn:hover:not(:disabled) {
    color: var(--text-primary);
    transform: scale(1.1);
}

.send-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* File Upload Styles */
.file-preview {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(255,255,255,0.1);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.file-info i {
    color: var(--accent-color);
}

.remove-file-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    margin-left: auto;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-file-btn:hover {
    color: var(--text-primary);
}

/* File message styling */
.file-message {
    background-color: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
}

.file-message img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 4px;
    display: block;
    margin: 8px 0;
}

.file-content-preview {
    max-height: 200px;
    overflow-y: auto;
    background-color: var(--code-bg);
    padding: 12px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    margin-top: 8px;
}

/* Image Styling */
.image-container {
    margin-top: 16px;
    max-width: 100%;
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--code-bg);
}

.generated-image {
    width: 100%;
    max-width: 512px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.image-prompt {
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 12px;
    font-size: 0.9rem;
    padding: 12px;
    background-color: rgba(0,0,0,0.2);
    border-radius: 0 0 8px 8px;
    border-top: 1px solid var(--border-color);
}

.image-prompt i {
    color: var(--accent-color);
    margin-right: 8px;
}

/* Math Diagram Styles */
.math-diagram {
    background-color: var(--code-bg);
    border-radius: 8px;
    padding: 16px;
    margin: 12px 0;
    text-align: center;
}

.math-diagram svg {
    max-width: 100%;
    height: auto;
}

/* MathJax styling override */
.mjx-chtml {
    font-size: 1.1em !important;
    color: var(--text-primary) !important;
}

/* Loading Animation */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 10px 0;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.empty-state h2 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 1.8rem;
}

.empty-state p {
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.example-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-top: 24px;
    max-width: 800px;
    width: 100%;
}

.example-card {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.example-card:hover {
    background-color: var(--sidebar-bg);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.example-card i {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--accent-color);
}

/* API Key Modal */
.modal-content {
    background-color: var(--sidebar-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal-header, .modal-footer {
    border-color: var(--border-color);
}

.form-label {
    color: var(--text-secondary);
}

.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-primary:hover {
    background-color: #15a369;
    border-color: #15a369;
}

/* Tables in Markdown */
.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
}

.message-content th,
.message-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.message-content th {
    background-color: rgba(255,255,255,0.05);
    font-weight: 600;
}

.message-content tr:nth-child(even) {
    background-color: rgba(255,255,255,0.02);
}

/* Blockquotes */
.message-content blockquote {
    border-left: 4px solid var(--accent-color);
    margin: 1em 0;
    padding-left: 16px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Links */
.message-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }

    .sidebar {
        position: fixed;
        left: -260px;
        z-index: 1000;
        transition: left 0.3s ease;
    }

    .sidebar.show {
        left: 0;
    }

    .menu-toggle {
        display: block !important;
        position: absolute;
        top: 8px;
        left: 8px;
        z-index: 100;
        background: transparent;
        border: none;
        color: var(--text-primary);
        font-size: 1.3rem;
        padding: 4px;
    }

    .chat-container {
        height: 100vh;
    }

    .messages-area {
        padding: 8px 8px;
        padding-top: 50px;
    }

    .message {
        padding: 8px 4px;
        gap: 8px;
        max-width: 100%;
    }

    .message-wrapper {
        gap: 8px;
    }

    .avatar {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
        flex-shrink: 0;
    }

    .message-content {
        font-size: 0.9rem;
        line-height: 1.5;
    }

    .message-content h1 {
        font-size: 1.2rem;
        margin-top: 0.8em;
        margin-bottom: 0.3em;
    }

    .message-content h2 {
        font-size: 1.1rem;
        margin-top: 0.7em;
        margin-bottom: 0.3em;
    }

    .message-content h3,
    .message-content h4,
    .message-content h5,
    .message-content h6 {
        font-size: 1rem;
        margin-top: 0.6em;
        margin-bottom: 0.3em;
    }

    .message-content p {
        margin-bottom: 0.5em;
    }

    .message-content ul,
    .message-content ol {
        margin-bottom: 0.5em;
        padding-left: 1.5em;
        font-size: 0.9rem;
    }

    .message-content li {
        margin-bottom: 0.2em;
    }

    .message-content code {
        font-size: 0.85em;
        padding: 1px 4px;
    }

    .message-content pre {
        padding: 8px;
        margin: 0.5em 0;
        font-size: 0.8rem;
        border-radius: 4px;
    }

    .message-content pre code {
        font-size: 0.8rem;
        line-height: 1.4;
    }

    .code-block-wrapper {
        margin: 0.5em 0;
    }

    .code-header {
        padding: 4px 8px;
        font-size: 0.75rem;
        border-radius: 4px 4px 0 0;
    }

    .copy-code-btn {
        font-size: 0.7rem;
        gap: 2px;
    }

    /* Input Area Mobile */
    .input-container {
        padding: 8px 8px 8px;
        margin: 0;
        max-width: 100%;
    }

    .input-wrapper {
        padding: 6px;
        border-radius: 6px;
        font-size: 0.9rem;
    }

    .form-control {
        font-size: 0.9rem;
        max-height: 120px;
    }

    .send-btn {
        padding: 4px;
        font-size: 1.1rem;
    }

    .file-preview {
        margin-top: 4px;
        padding-top: 4px;
    }

    .file-info {
        gap: 6px;
        padding: 6px 8px;
        font-size: 0.8rem;
    }

    /* Mode Selector Mobile */
    .mode-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
        gap: 6px;
    }

    /* Empty State Mobile */
    .empty-state {
        padding: 16px 12px;
        justify-content: flex-start;
        padding-top: 60px;
    }

    .empty-state h2 {
        font-size: 1.3rem;
        margin-bottom: 8px;
    }

    .empty-state p {
        font-size: 0.85rem;
        margin-bottom: 16px;
    }

    .example-cards {
        grid-template-columns: 1fr;
        gap: 8px;
        margin-top: 16px;
        max-width: 100%;
        width: 100%;
    }

    .example-card {
        padding: 12px;
        border-radius: 6px;
        font-size: 0.85rem;
    }

    .example-card i {
        font-size: 1.2rem;
        margin-bottom: 4px;
    }

    .example-card h6 {
        font-size: 0.8rem;
        margin: 4px 0 2px 0;
    }

    .example-card small {
        font-size: 0.75rem;
    }

    /* Image Mobile */
    .generated-image {
        max-width: 100%;
    }

    .image-prompt {
        margin-top: 8px;
        font-size: 0.8rem;
        padding: 8px;
    }

    .file-message {
        padding: 8px;
        margin-bottom: 8px;
        border-radius: 6px;
    }

    .file-message img {
        max-height: 200px;
        margin: 4px 0;
    }

    /* Math Diagram Mobile */
    .math-diagram {
        padding: 8px;
        margin: 6px 0;
        border-radius: 4px;
    }

    /* Typing indicator */
    .typing-indicator {
        gap: 3px;
        padding: 6px 0;
    }

    .typing-dot {
        width: 6px;
        height: 6px;
    }

    /* Tables Mobile */
    .message-content table {
        margin: 0.5em 0;
        font-size: 0.8rem;
    }

    .message-content th,
    .message-content td {
        padding: 4px 6px;
        border: 1px solid var(--border-color);
    }

    /* Blockquotes Mobile */
    .message-content blockquote {
        margin: 0.5em 0;
        padding-left: 12px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 13px;
    }

    .messages-area {
        padding: 6px 4px;
        padding-top: 45px;
    }

    .message {
        padding: 6px 2px;
        gap: 6px;
        margin: 0;
    }

    .avatar {
        width: 22px;
        height: 22px;
        font-size: 0.7rem;
    }

    .message-content {
        font-size: 0.85rem;
    }

    .input-container {
        padding: 6px;
        margin: 0;
    }

    .input-wrapper {
        padding: 4px;
        border-radius: 4px;
    }

    .form-control {
        font-size: 0.85rem;
        max-height: 100px;
    }

    .send-btn {
        padding: 2px;
        font-size: 1rem;
    }

    .menu-toggle {
        top: 6px;
        left: 6px;
        font-size: 1.2rem;
    }

    .empty-state {
        padding: 12px;
        padding-top: 50px;
    }

    .empty-state h2 {
        font-size: 1.1rem;
    }

    .empty-state p {
        font-size: 0.8rem;
    }

    .example-cards {
        gap: 6px;
    }

    .example-card {
        padding: 10px;
        font-size: 0.8rem;
    }

    .mode-btn {
        padding: 4px 10px;
        font-size: 0.75rem;
        gap: 4px;
    }

    .file-info {
        font-size: 0.75rem;
    }

    .code-header {
        padding: 3px 6px;
        font-size: 0.7rem;
    }

    .message-content code {
        font-size: 0.8em;
    }

    .message-content pre code {
        font-size: 0.75rem;
    }
}

.menu-toggle {
    display: none;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #565869;
}