/* --- Global Base Styles --- */
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    max-width: 960px;
    margin: 2rem auto;
    padding: 0 1.5rem 3rem 1.5rem;
    line-height: 1.6;
    background-color: #fafafa;
    color: #222;
}

/* --- Typography & Headers --- */
header {
    border-bottom: 1px solid #ccc;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
}

h1, h2, h3 {
    color: #333;
    line-height: 1.2;
}

h1 { margin-bottom: 0.5rem; }
h2 { margin-top: 2rem; margin-bottom: 1rem; }

/* Specific style for index.html date */
.date {
    color: #666;
    font-size: 0.95em;
    font-style: italic;
    display: block;
}

/* --- Navigation & Links --- */
nav a {
    margin-right: 1.5rem;
    text-decoration: none;
    color: #0066cc;
}

nav a:hover {
    text-decoration: underline;
}

/* --- Content Blocks --- */
p, ul, ol {
    margin-bottom: 1.2rem;
}

ul {
    margin-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* --- Media Elements --- */
img.reactor-gif {
    display: block;
    margin: 2rem auto;
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* --- Data & Code --- */
table {
    border-collapse: collapse;
    margin: 1.5rem 0;
    width: 100%;
}

th, td {
    border: 1px solid #ddd;
    padding: 0.75rem;
    text-align: left;
}

th {
    background: #f5f5f5;
    font-weight: 600;
}

code {
    font-family: Consolas, "Fira Code", monospace;
    font-size: 0.9em;
    background: #eee;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

/* --- Footer --- */
footer {
    border-top: 1px solid #ccc;
    margin-top: 3rem;
    padding-top: 1.5rem;
    font-size: 0.9rem;
    color: #555;
}