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

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: white;
    font-size: 2.5em;
    margin-bottom: 30px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

#chat-container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
}

#messages {
    height: 400px;
    overflow-y: auto;
    padding: 20px;
    background: #f9f9f9;
}

.bot-message {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 10px;
    border-left: 4px solid #2196f3;
}

.user-message {
    background: #f3e5f5;
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 10px;
    border-left: 4px solid #9c27b0;
    text-align: right;
}

.input-container {
    padding: 20px;
    display: flex;
    gap: 10px;
}

#user-input {
    flex: 1;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 25px;
    font-size: 16px;
    outline: none;
}

#user-input:focus {
    border-color: #2196f3;
}

button {
    padding: 15px 30px;
    background: #2196f3;
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

button:hover {
    background: #1976d2;
    transform: translateY(-2px);
}