:root {
    --bg: #ffffff;
    --text: #1a1a1a;
    --header-bg: #f4f4f9;
    --accent: #3498db;
}

body.dark-mode {
    --bg: #121212;
    --text: #e0e0e0;
    --header-bg: #1f1f1f;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Georgia', serif;
    margin: 0;
    line-height: 1.8;
    transition: background 0.3s;
}

#main-header {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: var(--header-bg);
    border-bottom: 1px solid #ccc;
    z-index: 1000;
}

.logo-area { display: flex; align-items: center; gap: 15px; }
h1 { font-size: 1.1rem; margin: 0; }

#content-area {
    max-width: 700px;
    margin: 0 auto;
    padding: 30px 20px;
}

.chapter {
    margin-bottom: 80px;
    padding-bottom: 40px;
    border-bottom: 1px solid #eee;
}

.chapter-header {
    color: var(--accent);
    font-size: 1.9rem;
    margin-bottom: 25px;
}

p {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    text-align: justify;
}

.loader { text-align: center; margin-top: 50px; font-size: 1.2rem; color: #888; }
.error-box { background: #fee; color: #b00; padding: 15px; border-radius: 5px; text-align: center; }

select, button {
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid #ccc;
    cursor: pointer;
}