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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    align-items: start;
}

.chat-container {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.chat-history {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.message {
    margin-bottom: 15px;
    padding: 12px;
    border-radius: 8px;
    max-width: 80%;
}

.user-message {
    background: #007bff;
    color: white;
    margin-left: auto;
    text-align: right;
}

.assistant-message {
    background: #e9ecef;
    color: #333;
}

.controls {
    margin-bottom: 15px;
}

.controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    cursor: pointer;
}

.controls input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.message-input {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.message-input textarea {
    flex: 1;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    resize: vertical;
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.3s;
}

.message-input textarea:focus {
    outline: none;
    border-color: #007bff;
}

.message-input button {
    padding: 12px 24px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.message-input button:hover {
    background: #0056b3;
}

.message-input button:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.api-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.api-section h3 {
    margin-bottom: 20px;
    color: #333;
    border-bottom: 2px solid #007bff;
    padding-bottom: 10px;
}

.endpoint {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #007bff;
}

.endpoint strong {
    color: #007bff;
}

.endpoint code {
    background: #e9ecef;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

.endpoint pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 12px;
    border-radius: 6px;
    margin-top: 10px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 15px;
    }
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.success-message {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
}