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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 90%;
    max-width: 900px;
    height: 90vh;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    text-align: center;
}

header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #f7f9fc;
}

.welcome-message {
    text-align: center;
    padding: 40px 20px;
}

.welcome-message h2 {
    color: #333;
    font-size: 20px;
    margin-bottom: 20px;
}

.suggested-questions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

.suggestion-btn {
    background: white;
    border: 2px solid #667eea;
    color: #667eea;
    padding: 12px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.suggestion-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.message {
    margin-bottom: 20px;
    display: flex;
    animation: fadeIn 0.3s;
}

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

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

.message.assistant {
    justify-content: flex-start;
}

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

.message.user .message-content {
    background: #667eea;
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background: white;
    color: #333;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.message-content pre {
    background: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 10px 0;
}

.message-content code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 10px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #999;
    border-radius: 50%;
    animation: bounce 1.4s infinite;
}

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

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

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

.input-container {
    display: flex;
    gap: 10px;
    padding: 20px;
    background: white;
    border-top: 1px solid #e0e0e0;
}

#userInput {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    max-height: 120px;
    transition: border-color 0.3s;
}

#userInput:focus {
    outline: none;
    border-color: #667eea;
}

#sendBtn {
    background: #667eea;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#sendBtn:hover {
    background: #5568d3;
    transform: translateY(-2px);
}

#sendBtn:active {
    transform: translateY(0);
}

#sendBtn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.timestamp {
    font-size: 11px;
    color: #999;
    margin-top: 4px;
    text-align: right;
}

/* Scrollbar styling */
.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chat-container::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .container {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }

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

    header h1 {
        font-size: 20px;
    }
}