:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --code-bg: #f1f5f9;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Configuration Section */
.config-section {
    background: var(--surface);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.config-section.hidden {
    display: none;
}

.config-section h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.config-item {
    display: flex;
    flex-direction: column;
}

.config-item label {
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.config-item input,
.config-item select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.config-item input:focus,
.config-item select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.toggle-config {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.toggle-config:hover {
    background: var(--primary-hover);
}

/* Chat Container */
.chat-container {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    height: 600px;
}

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

.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-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
    flex-shrink: 0;
}

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

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

.message-content {
    flex: 1;
    background: var(--code-bg);
    padding: 12px 16px;
    border-radius: 8px;
}

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

.message-content h1, .message-content h2, .message-content h3,
.message-content h4, .message-content h5, .message-content h6 {
    margin-top: 16px;
    margin-bottom: 8px;
    font-weight: 600;
    line-height: 1.25;
}

.message-content h1 { font-size: 1.5rem; }
.message-content h2 { font-size: 1.3rem; }
.message-content h3 { font-size: 1.1rem; }
.message-content h4 { font-size: 1rem; }
.message-content h5 { font-size: 0.9rem; }
.message-content h6 { font-size: 0.85rem; }

.message-content p {
    margin-bottom: 8px;
    line-height: 1.6;
}

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

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

.message-content li.task-item {
    list-style: none;
    margin-left: -20px;
}

.message-content li.task-item input[type="checkbox"] {
    margin-right: 8px;
}

.message-content code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: #e01e5a;
}

.user-message .message-content code {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.message-content pre {
    background: var(--code-bg);
    padding: 12px;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
}

.message-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

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

.message-content em {
    font-style: italic;
}

.message-content del {
    text-decoration: line-through;
    opacity: 0.6;
}

.message-content mark {
    background: #fef3c7;
    color: var(--text-primary);
    padding: 2px 4px;
    border-radius: 3px;
}

.message-content blockquote {
    border-left: 4px solid var(--primary-color);
    margin: 12px 0;
    padding: 8px 16px;
    background: var(--code-bg);
    border-radius: 4px;
    font-style: italic;
}

.message-content hr {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: 16px 0;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    overflow-x: auto;
    display: block;
}

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

.message-content table th {
    background: var(--code-bg);
    font-weight: 600;
}

.message-content table tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.message-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 8px 0;
}

.message-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.message-content a:hover {
    text-decoration: none;
}

.user-message .message-content a {
    color: #fff;
    text-decoration: underline;
}

/* Syntax highlighting hints */
.message-content code.language-javascript,
.message-content code.language-js {
    color: #f7df1e;
}

.message-content code.language-python,
.message-content code.language-py {
    color: #3776ab;
}

.message-content code.language-html {
    color: #e34c26;
}

.message-content code.language-css {
    color: #1572b6;
}

.message-content code.language-json {
    color: #000000;
}

/* Tool call indicators */
.tool-call {
    background: var(--code-bg);
    border-left: 3px solid var(--primary-color);
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    font-size: 0.9rem;
}

.tool-call-header {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.tool-call-details {
    color: var(--text-secondary);
    font-family: monospace;
    font-size: 0.85rem;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
    margin-top: 8px;
}

.tool-call-item {
    padding: 4px 0;
    border-bottom: 1px solid var(--border-color);
}

.tool-call-item:last-child {
    border-bottom: none;
}

.tool-toggle {
    float: right;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.tool-error {
    color: #e74c3c;
}

/* Loading indicator */
.loading-message {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-style: italic;
}

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

.loading-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: bounce 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; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* Input Section */
.input-section {
    display: flex;
    gap: 10px;
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

#userInput {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

#userInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

#sendButton {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
    font-size: 1rem;
    font-weight: 500;
}

#sendButton:hover:not(:disabled) {
    background: var(--primary-hover);
}

#sendButton:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Examples Section */
.examples-section {
    background: var(--surface);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.examples-section h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.example-button {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.example-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--surface);
    padding: 30px;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.modal-content h3 {
    margin-bottom: 20px;
}

#approvalDetails {
    background: var(--code-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-family: monospace;
    font-size: 0.9rem;
    max-height: 300px;
    overflow-y: auto;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.approve-btn,
.reject-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
}

.approve-btn {
    background: var(--success-color);
    color: white;
}

.approve-btn:hover {
    background: #059669;
}

.reject-btn {
    background: var(--error-color);
    color: white;
}

.reject-btn:hover {
    background: #dc2626;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Error message */
.error-message {
    background: #fee;
    border: 1px solid #fcc;
    color: #c00;
    padding: 10px;
    border-radius: 6px;
    margin: 10px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .config-grid {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-container {
        height: 500px;
    }
}