:root {
    --bg-color: #fdfdfd;
    --text-color: #1a1a1a;
    --accent-color: #800000; /* Deep Maroon */
    --border-color: #e0e0e0;
    --max-width: 800px;
}

body {
    font-family: "Georgia", "Times New Roman", serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.lang-selector {
    list-style: none;
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

.lang-selector a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.9rem;
    font-family: sans-serif;
}

.lang-selector a:hover {
    color: var(--accent-color);
}

main {
    max-width: var(--max-width);
    margin: 4rem auto;
    padding: 0 2rem;
    flex-grow: 1;
}

h1, h2, h3 {
    color: var(--accent-color);
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.15rem;
}

.treatise-box {
    background-color: #fffaf0;
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: #666;
}

@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    main { margin: 2rem auto; }
}