* {
    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;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.chat-container {
    width: 100%;
    max-width: 600px;
    height: 80vh;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.chat-header h2 {
    font-size: 24px;
    margin-bottom: 5px;
}

.chat-header p {
    font-size: 14px;
    opacity: 0.9;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f5f5f5;
}

.message {
    margin-bottom: 15px;
    display: flex;
}

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

.user-message .message-content {
    background: #667eea;
    color: white;
    border-radius: 20px 20px 5px 20px;
}

.bot-message .message-content {
    background: white;
    color: #333;
    border-radius: 20px 20px 20px 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.message-content {
    padding: 12px 16px;
    max-width: 80%;
    word-wrap: break-word;
    line-height: 1.4;
}

.chat-input {
    display: flex;
    padding: 20px;
    background: white;
    border-top: 1px solid #eee;
}

#user-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 25px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

#user-input:focus {
    border-color: #667eea;
}

#send-btn {
    margin-left: 10px;
    padding: 12px 25px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background 0.3s;
}

#send-btn:hover {
    background: #5a67d8;
}

/* Анимация появления сообщений */
.message {
    animation: fadeIn 0.3s ease-in;
}

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