:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --primary-light: #a29bfe;
    --accent: #00cec9;
    --bg-dark: #0f0f1a;
    --bg-darker: #141425;
    --bg-card: #1c1c35;
    --bg-input: #252545;
    --text-primary: #e8e8e8;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border: #2d2d5e;
    --success: #48bb78;
    --error: #fc8181;
    --warning: #f6ad55;
    --user-bubble: #6c5ce7;
    --ai-bubble: #1c1c35;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

button, a, input, select, textarea {
    touch-action: manipulation;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--bg-darker);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 100;
}

.sidebar-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-light);
}

.logo i {
    font-size: 22px;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.sidebar-content::-webkit-scrollbar {
    width: 4px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
    margin-bottom: 16px;
}

.new-chat-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.knowledge-nav h3,
.chat-history h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 8px 4px;
    margin-bottom: 4px;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 16px;
}

.nav-category {
    margin-bottom: 6px;
}

.nav-category-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 8px 4px;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-light);
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(108, 92, 231, 0.15);
    margin-bottom: 2px;
}

.nav-category-title i {
    font-size: 13px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px 9px 24px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--primary-light);
}

.nav-item i {
    width: 18px;
    text-align: center;
    font-size: 13px;
}

.chat-history {
    margin-top: 8px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.history-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.history-item .history-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item .delete-chat {
    opacity: 0;
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    padding: 2px 6px;
    font-size: 12px;
    transition: var(--transition);
}

.history-item:hover .delete-chat {
    opacity: 1;
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border);
}

.clear-history-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: transparent;
    color: var(--error);
    border: 1px solid rgba(252, 129, 129, 0.3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    width: 100%;
    transition: var(--transition);
}

.clear-history-btn:hover {
    background: rgba(252, 129, 129, 0.1);
    border-color: var(--error);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.main-header {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border);
    gap: 16px;
}

.main-header h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-light);
    flex: 1;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-toggle, .test-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

.mode-toggle:hover, .test-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

.mode-toggle.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

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

.chat-container::-webkit-scrollbar {
    width: 6px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    padding: 40px 20px;
}

.welcome-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: 0 8px 32px rgba(108, 92, 231, 0.3);
}

.welcome-icon i {
    font-size: 36px;
    color: white;
}

.welcome-screen h2 {
    font-size: 24px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.welcome-screen > p {
    font-size: 15px;
    color: var(--text-secondary);
    max-width: 500px;
    line-height: 1.6;
    margin-bottom: 32px;
}

.quick-start h3 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.quick-questions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.quick-q {
    padding: 10px 18px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

.quick-q:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(0, 117, 143, 0.1);
}

.messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

.message {
    display: flex;
    gap: 12px;
    animation: fadeIn 0.3s ease;
}

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

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--primary);
    color: white;
}

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

.message-content {
    max-width: 75%;
    padding: 14px 18px;
    border-radius: var(--radius);
    line-height: 1.7;
    font-size: 14px;
}

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

.message.assistant .message-content {
    background: var(--ai-bubble);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border);
}

.message-content p {
    margin-bottom: 10px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content strong {
    color: var(--primary-light);
}

.message-content ul, .message-content ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message-content li {
    margin-bottom: 4px;
}

.message-content pre {
    background: #282c34;
    border-radius: var(--radius-sm);
    padding: 0;
    margin: 12px 0;
    overflow: hidden;
    position: relative;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: #21252b;
    font-size: 12px;
    color: var(--text-muted);
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 4px;
}

.copy-btn:hover {
    color: var(--primary-light);
    background: rgba(255, 255, 255, 0.1);
}

.message-content pre code {
    display: block;
    padding: 14px;
    overflow-x: auto;
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.6;
}

.message-content code:not(pre code) {
    background: rgba(108, 92, 231, 0.2);
    color: var(--primary-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
}

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

.message-content th {
    background: var(--bg-input);
    color: var(--primary-light);
    font-weight: 600;
}

.message-content blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 14px;
    margin: 10px 0;
    color: var(--text-secondary);
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-light);
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

.input-area {
    padding: 16px 20px;
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    transition: var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

#userInput {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 120px;
    font-family: inherit;
}

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

.send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: var(--transition);
    flex-shrink: 0;
}

.send-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.send-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 4px 0;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

.status-indicator i {
    font-size: 8px;
}

.status-indicator.ready i { color: var(--success); }
.status-indicator.loading i { color: var(--warning); animation: pulse 1s infinite; }
.status-indicator.error i { color: var(--error); }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.char-count {
    font-size: 12px;
    color: var(--text-muted);
}

.test-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.test-modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: 4px;
}

.modal-body {
    padding: 20px;
}

.test-item {
    padding: 14px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
}

.test-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
}

.test-status {
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.test-status.pending {
    background: rgba(113, 128, 150, 0.2);
    color: var(--text-muted);
}

.test-status.running {
    background: rgba(246, 173, 85, 0.2);
    color: var(--warning);
}

.test-status.success {
    background: rgba(72, 187, 120, 0.2);
    color: var(--success);
}

.test-status.error {
    background: rgba(252, 129, 129, 0.2);
    color: var(--error);
}

.test-detail {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    max-height: 100px;
    overflow-y: auto;
}

.run-test-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    margin-top: 10px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.run-test-btn:hover {
    background: var(--primary-dark);
}

.run-test-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

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

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        bottom: 0;
        transition: left 0.3s ease;
        width: 280px;
        min-width: 280px;
    }

    .sidebar.open {
        left: 0;
    }

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

    #sidebarClose {
        display: flex;
    }

    .message-content {
        max-width: 85%;
    }

    .quick-questions {
        flex-direction: column;
        align-items: center;
    }

    .quick-q {
        width: 100%;
        max-width: 280px;
    }

    .mode-toggle span {
        display: none;
    }

    .main-header h1 {
        font-size: 16px;
    }

    .welcome-screen h2 {
        font-size: 20px;
    }

    .welcome-screen > p {
        font-size: 14px;
        padding: 0 10px;
    }

    .quick-start h3 {
        font-size: 12px;
    }

    .quick-q {
        font-size: 14px;
        padding: 12px 16px;
    }

    .message-content {
        font-size: 14px;
        padding: 12px 14px;
    }

    .message-content pre code {
        font-size: 12px;
    }

    .input-wrapper {
        padding: 6px 10px;
    }

    #userInput {
        font-size: 16px;
    }

    .send-btn {
        width: 44px;
        height: 44px;
    }

    .nav-item {
        padding: 12px 14px;
        font-size: 14px;
    }

    .tool-item {
        padding: 12px 14px;
        font-size: 14px;
    }

    .history-item {
        padding: 12px 14px;
        font-size: 14px;
    }

    .new-chat-btn {
        padding: 14px 16px;
        font-size: 14px;
    }

    .clear-history-btn {
        padding: 12px 14px;
        font-size: 14px;
    }

    .code-tool-panel {
        max-height: 60vh;
    }

    .tool-panel-header {
        padding: 14px 16px;
    }

    .tool-panel-header h3 {
        font-size: 16px;
    }

    .tool-panel-close {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
    }

    .tool-panel-body {
        padding: 12px 16px;
    }

    .code-input-header {
        flex-wrap: wrap;
        gap: 8px;
    }

    .code-input-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .code-lang-select {
        padding: 10px 12px;
        font-size: 14px;
        min-height: 44px;
    }

    .file-upload-btn,
    .clear-code-btn {
        width: 44px;
        height: 44px;
    }

    .code-textarea {
        min-height: 150px;
        font-size: 14px;
        padding: 12px;
    }

    .code-input-footer {
        padding: 8px 2px;
    }

    .code-char-count,
    .file-name {
        font-size: 13px;
    }

    .analyze-btn {
        padding: 14px;
        font-size: 16px;
        min-height: 50px;
    }

    .test-modal .modal-content {
        width: 95%;
        max-height: 90vh;
        overflow-y: auto;
    }

    .modal-header {
        padding: 14px 16px;
    }

    .modal-header h3 {
        font-size: 16px;
    }

    .modal-close {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .modal-body {
        padding: 16px;
    }

    .test-item {
        padding: 12px;
    }

    .test-header {
        font-size: 14px;
    }

    .run-test-btn {
        padding: 14px;
        font-size: 16px;
        min-height: 50px;
    }

    .code-header {
        padding: 10px 12px;
    }

    .copy-btn {
        padding: 8px 12px;
        font-size: 13px;
        min-height: 32px;
    }

    .status-indicator {
        font-size: 13px;
    }

    .char-count {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 260px;
        min-width: 260px;
        left: -260px;
    }

    .main-header {
        padding: 10px 12px;
    }

    .main-header h1 {
        font-size: 14px;
    }

    .header-actions {
        gap: 6px;
    }

    .mode-toggle,
    .test-btn {
        padding: 10px 12px;
        font-size: 14px;
        min-width: 44px;
        min-height: 44px;
    }

    .welcome-icon {
        width: 64px;
        height: 64px;
    }

    .welcome-icon i {
        font-size: 28px;
    }

    .welcome-screen h2 {
        font-size: 18px;
    }

    .welcome-screen > p {
        font-size: 13px;
    }

    .quick-q {
        font-size: 13px;
        padding: 10px 14px;
    }

    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }

    .message-content {
        font-size: 14px;
        padding: 10px 12px;
        max-width: 88%;
    }

    .message.user .message-content {
        border-bottom-right-radius: 4px;
    }

    .message.assistant .message-content {
        border-bottom-left-radius: 4px;
    }

    .input-area {
        padding: 12px;
    }

    .input-wrapper {
        padding: 6px 8px;
    }

    #userInput {
        font-size: 16px;
        max-height: 100px;
    }

    .send-btn {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }

    .input-footer {
        padding: 4px 2px 0;
    }

    .nav-category-title {
        font-size: 11px;
        padding: 8px 6px 4px;
    }

    .nav-item {
        padding: 10px 12px;
        font-size: 13px;
    }

    .nav-item i {
        font-size: 12px;
    }

    .tool-section h3 {
        font-size: 11px;
    }

    .tool-item {
        padding: 10px 12px;
        font-size: 13px;
    }

    .history-item {
        padding: 10px 12px;
        font-size: 13px;
    }

    .new-chat-btn {
        padding: 12px 14px;
        font-size: 13px;
    }

    .clear-history-btn {
        padding: 10px 12px;
        font-size: 12px;
    }

    .logo {
        font-size: 14px;
    }

    .logo i {
        font-size: 18px;
    }

    .sidebar-header {
        padding: 12px 14px;
    }

    .sidebar-content {
        padding: 10px;
    }

    .sidebar-footer {
        padding: 10px;
    }

    .chat-container {
        padding: 12px;
    }

    .messages {
        gap: 12px;
    }

    .code-tool-panel {
        max-height: 55vh;
    }

    .tool-panel-header {
        padding: 12px 14px;
    }

    .tool-panel-header h3 {
        font-size: 15px;
    }

    .tool-panel-body {
        padding: 10px 14px;
    }

    .code-input-header label {
        font-size: 14px;
    }

    .code-textarea {
        min-height: 120px;
        font-size: 13px;
        padding: 10px;
    }

    .analyze-btn {
        padding: 12px;
        font-size: 15px;
    }

    .code-input-actions {
        gap: 6px;
    }

    .code-lang-select {
        padding: 8px 10px;
        font-size: 13px;
    }
}

@media (max-width: 360px) {
    .sidebar {
        width: 240px;
        min-width: 240px;
        left: -240px;
    }

    .main-header h1 {
        font-size: 13px;
    }

    .welcome-screen h2 {
        font-size: 16px;
    }

    .welcome-screen > p {
        font-size: 12px;
    }

    .quick-q {
        font-size: 12px;
        padding: 8px 12px;
    }

    .message-content {
        font-size: 13px;
        padding: 8px 10px;
    }

    .message-content pre code {
        font-size: 11px;
    }

    #userInput {
        font-size: 16px;
    }

    .code-textarea {
        font-size: 12px;
    }

    .tool-panel-header h3 {
        font-size: 14px;
    }

    .analyze-btn {
        font-size: 14px;
    }
}

@media (min-width: 769px) {
    #sidebarClose {
        display: none;
    }

    #sidebarOpen {
        display: none;
    }
}

@media (hover: none) and (pointer: coarse) {
    .nav-item:hover,
    .tool-item:hover,
    .history-item:hover,
    .quick-q:hover {
        background: var(--bg-card);
    }

    .nav-item:active,
    .tool-item:active,
    .history-item:active,
    .quick-q:active {
        background: rgba(108, 92, 231, 0.15);
    }

    .send-btn:hover,
    .analyze-btn:hover,
    .run-test-btn:hover,
    .new-chat-btn:hover {
        transform: none;
    }

    .send-btn:active,
    .analyze-btn:active,
    .run-test-btn:active,
    .new-chat-btn:active {
        transform: scale(0.98);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

.loading-dots {
    display: inline-flex;
    gap: 4px;
    padding: 4px 0;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-light);
    animation: dotBounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0; }

@keyframes dotBounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.tool-section {
    margin-bottom: 12px;
}

.tool-section h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 8px 4px;
    margin-bottom: 4px;
}

.tool-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    background: var(--bg-card);
    border: 1px solid transparent;
}

.tool-item:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(108, 92, 231, 0.1);
}

.tool-item.active {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(108, 92, 231, 0.15);
}

.tool-item i {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

.code-tool-panel {
    display: none;
    flex-direction: column;
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
    max-height: 50vh;
    overflow: hidden;
}

.code-tool-panel.active {
    display: flex;
}

.tool-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
}

.tool-panel-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--primary-light);
}

.tool-panel-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.tool-panel-close:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tool-panel-body {
    padding: 16px 20px;
    overflow-y: auto;
}

.code-input-section {
    margin-bottom: 12px;
}

.code-input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.code-input-header label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.code-input-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.code-lang-select {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-size: 12px;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.code-lang-select:hover,
.code-lang-select:focus {
    border-color: var(--primary);
}

.file-upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.file-upload-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

.clear-code-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.clear-code-btn:hover {
    border-color: var(--error);
    color: var(--error);
}

.code-textarea {
    width: 100%;
    min-height: 180px;
    max-height: 300px;
    background: #1a1a2e;
    color: #e8e8e8;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: var(--transition);
    tab-size: 4;
}

.code-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.code-textarea::placeholder {
    color: var(--text-muted);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.code-input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 2px;
}

.code-char-count {
    font-size: 12px;
    color: var(--text-muted);
}

.file-name {
    font-size: 12px;
    color: var(--accent);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.analyze-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.analyze-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.analyze-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.analyze-btn i {
    font-size: 14px;
}