body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background: #007BFF;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

main {
    max-width: 960px;
    margin: 2rem auto;
    padding: 0 20px;
}

section {
    background: #fff;
    margin-bottom: 2rem;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h2 {
    color: #007BFF;
    border-bottom: 2px solid #007BFF;
    padding-bottom: 0.5rem;
    margin-top: 0;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    background: #e7f3ff;
    margin-bottom: 0.5rem;
    padding: 0.75rem;
    border-left: 4px solid #007BFF;
}

pre {
    background: #282c34;
    color: #abb2bf;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    font-family: 'Fira Code', 'Courier New', monospace;
}

.chart-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 2rem;
}

.chart-container figure {
    margin: 0;
    text-align: center;
    max-width: 45%;
}

.chart-container img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
}

figcaption {
    margin-top: 0.5rem;
    font-style: italic;
    color: #555;
}

footer {
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
    background: #333;
    color: #fff;
}

/* System Architecture Diagram Styles */
.architecture-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    margin-top: 2rem;
}

.architecture-row {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.architecture-box {
    background-color: #fff;
    border: 2px solid #007bff;
    border-radius: 8px;
    padding: 1.5rem;
    min-width: 150px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.arrows {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none; /* Make sure arrows don't block interaction */
}

.architecture-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.architecture-box h4 {
    margin: 0 0 10px 0;
    color: #0056b3;
    font-size: 1.1em;
}

.architecture-arrow {
    font-size: 2.5em;
    color: #007bff;
    align-self: center;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
    100% {
        transform: scale(1);
        opacity: 0.7;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .chart-container figure {
        max-width: 100%;
    }
}