:root {
    --primary-color: #0055B8;
    --secondary-color: #004494;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --error-color: #dc3545;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

.navbar {
    background-color: var(--primary-color);
    padding: 1rem 0;
}

.navbar-brand img {
    max-height: 40px;
}

.chat-container {
    max-width: 800px;
    margin: 0 auto;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.message {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
}

.system-message {
    background-color: #e9ecef;
}

.user-message {
    background-color: var(--primary-color);
    color: white;
}

.assistant-message {
    background-color: white;
    border: 1px solid #dee2e6;
}

.feature-card {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    height: 100%;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.icon {
    font-size: 2rem;
}

footer {
    background-color: var(--light-bg);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--secondary-color);
}

footer .fab {
    font-size: 1.5rem;
    transition: transform 0.2s ease;
}

footer .fab:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.error-message {
    background-color: #fff8f8;
    border: 1px solid var(--error-color);
    color: var(--error-color);
}