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

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #ffffff;
    --text-color: #000000;
    --border-color: #dee2e6;
    --message-user-bg: #007bff;
    --message-assistant-bg: #f1f3f5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    height: 100vh;
    overflow: hidden;
}

#chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
}

#chat-header {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#brand-name {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #dc3545;
}

.status-indicator.connected {
    background-color: #28a745;
}

#messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

#messages {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
}

.message.user {
    align-self: flex-end;
    background-color: var(--message-user-bg);
    color: white;
}

.message.assistant {
    align-self: flex-start;
    background-color: var(--message-assistant-bg);
    color: var(--text-color);
}

#typing-indicator {
    padding: 12px 16px;
    color: var(--secondary-color);
    font-style: italic;
}

#input-container {
    display: flex;
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    gap: 10px;
}

#message-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 14px;
    outline: none;
}

#message-input:focus {
    border-color: var(--primary-color);
}

#send-btn {
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: opacity 0.2s;
}

#send-btn:hover:not(:disabled) {
    opacity: 0.9;
}

#send-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}