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

.chat-container {
    width: 100%;
    max-width: 500px;
    height: 90vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    margin: 20px;
}

.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px 20px;
    text-align: center;
}

.chat-header h1 {
    margin: 0;
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.chat-header p {
    margin: 10px 0 0;
    font-size: 14px;
    opacity: 0.9;
    line-height: 1.5;
}

.status {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: #4ade80;
    border-radius: 50%;
    margin-left: 8px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
    100% { opacity: 1; transform: scale(1); }
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    background: #f8fafc;
}

.message {
    max-width: 80%;
    padding: 12px 18px;
    border-radius: 20px;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease;
    font-size: 15px;
    line-height: 1.5;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

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

.user-message {
    align-self: flex-end;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.bot-message {
    align-self: flex-start;
    background: white;
    color: #1e293b;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 15px 20px;
    background: white;
    border-radius: 20px;
    align-self: flex-start;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #94a3b8;
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.6; }
    30% { transform: translateY(-10px); opacity: 1; }
}

.input-area {
    display: flex;
    padding: 20px;
    gap: 10px;
    background: white;
    border-top: 1px solid #e2e8f0;
}

#messageInput {
    flex: 1;
    padding: 12px 18px;
    border: 2px solid #e2e8f0;
    border-radius: 25px;
    outline: none;
    font-size: 15px;
    transition: all 0.3s;
    background: #f8fafc;
}

#messageInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#sendButton {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

#sendButton:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

#sendButton:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.welcome-message {
    text-align: center;
    color: #64748b;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    background: #f1f5f9;
    border-radius: 12px;
}