:root {
    --primary-color: #4F46E5;
    --background-color: #F3F4F6;
    --surface-color: #FFFFFF;
    --text-color: #111827;
    --subtle-text-color: #6B7280;
    --user-message-bg: var(--primary-color);
    --bot-message-bg: var(--surface-color);
}

body {
    background-color: var(--background-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    margin: 0;
}

.chat-container {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 1rem;
    box-sizing: border-box;
}

.chat-header {
    padding: 1rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid #E5E7EB;
    border-radius: 0.5rem 0.5rem 0 0;
    text-align: center;
}

.chat-header h1 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background-color: #E5E7EB;
}

.message {
    display: flex;
    margin-bottom: 1rem;
    max-width: 85%;
}

.message-bubble {
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    line-height: 1.5;
    font-size: 0.9rem;
}

.message.user {
    margin-left: auto;
    flex-direction: row-reverse;
}

.message.user .message-bubble {
    background-color: var(--user-message-bg);
    color: white;
    border-bottom-right-radius: 0.125rem;
}

.message.bot .message-bubble {
    background-color: var(--bot-message-bg);
    color: var(--text-color);
    border-bottom-left-radius: 0.125rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.chat-input {
    display: flex;
    padding: 1rem;
    background-color: var(--surface-color);
    border-top: 1px solid #E5E7EB;
    border-radius: 0 0 0.5rem 0.5rem;
}

.chat-input input {
    flex-grow: 1;
    border: 1px solid #D1D5DB;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    margin-right: 0.5rem;
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.3);
}

.chat-input button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

.chat-input button:hover {
    background-color: #4338CA;
}