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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #cecece 100%);
    min-height: 100vh;
    color: #495057;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.title {
    font-size: 5rem;
    font-weight: 900;
    color: #495057;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2rem;
    color: #6c757d;
    font-weight: 300;
}

.demo-card {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    margin-bottom: 2rem;
}

.demo-title {
    font-size: 2rem;
    font-weight: 700;
    color: #495057;
    margin-bottom: 1.5rem;
    text-align: center;
}

.features-list {
    list-style: none;
    margin: 2rem 0;
}

.features-list li {
    padding: 1rem 0;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.features-list li:last-child {
    border-bottom: none;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.feature-text {
    font-size: 1.1rem;
    color: #495057;
}

.instruction-box {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 4px solid #dc3545;
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
}

.instruction-text {
    font-size: 1rem;
    color: #495057;
    line-height: 1.6;
}

.highlight {
    color: #dc3545;
    font-weight: 600;
}

.chat-preview {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    border: 2px solid #e9ecef;
}

.chat-preview-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #495057;
    margin-bottom: 1rem;
}

.message-example {
    background: white;
    padding: 0.8rem 1rem;
    border-radius: 18px;
    margin: 0.5rem 0;
    font-size: 0.9rem;
    border: 1px solid #e9ecef;
}

.message-user {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    margin-left: 2rem;
    border-bottom-right-radius: 4px;
}

.message-bot {
    margin-right: 2rem;
    border-bottom-left-radius: 4px;
}

.footer {
    text-align: center;
    padding: 0.5rem;
    color: #6c757d;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2.5rem;
    }

    .demo-card {
        padding: 2rem;
    }

    .message-user {
        margin-left: 1rem;
    }

    .message-bot {
        margin-right: 1rem;
    }
}