:root {
    --bg-color: #f9f7f1; /* 经典的羊皮纸护眼色 */
    --text-color: #333333;
    --primary-color: #2c3e50;
    --accent-color: #d35400;
    --ad-bg: #ffffff;
}

/* 夜间模式变量 */
body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #b0b0b0;
    --ad-bg: #2d2d2d;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Merriweather', serif; /* 小说常用衬线体 */
    line-height: 1.8;
    transition: background 0.3s, color 0.3s;
}

/* 导航栏 */
.navbar {
    position: sticky; top: 0;
    background-color: var(--bg-color);
    padding: 15px 20px;
    display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    z-index: 100;
    font-family: 'Roboto', sans-serif;
}
.nav-left { display: flex; align-items: center; gap: 10px; font-weight: bold; }
.icon-back { font-size: 20px; cursor: pointer; }
.icon-btn { background: none; border: none; font-size: 18px; cursor: pointer; color: inherit; padding: 5px;}

/* 容器 */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* 头部信息 */
.book-header { text-align: center; margin-bottom: 40px; border-bottom: 1px solid rgba(0,0,0,0.05); padding-bottom: 20px;}
.book-title { font-size: 28px; margin-bottom: 10px; color: var(--text-color); }
.book-meta { font-family: 'Roboto', sans-serif; font-size: 12px; color: #888; margin-bottom: 10px; }
.update-info { font-family: 'Roboto', sans-serif; font-size: 10px; color: #aaa; font-style: italic; }

/* 正文 */
.chapter-title {
    font-family: 'Roboto', sans-serif;
    font-size: 20px;
    font-weight: 700;
    margin-top: 30px; margin-bottom: 15px;
    color: var(--accent-color);
}
.content-body p {
    font-size: 18px;
    margin-bottom: 20px;
    text-align: justify;
}

/* === 原生广告位样式 (Native Ads) === */
.native-ad-slot {
    margin: 30px 0;
    padding: 15px;
    background-color: var(--ad-bg);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    cursor: pointer; /* 让鼠标变成手型，暗示可点 */
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.ad-label {
    position: absolute; top: -10px; left: 10px;
    background: #ccc; color: white;
    font-family: sans-serif; font-size: 10px;
    padding: 2px 6px; border-radius: 4px;
}

.ad-content-box {
    display: flex; align-items: center;
    font-family: 'Roboto', sans-serif;
}

.ad-placeholder-text { font-size: 14px; width: 100%; }
.read-more-link { 
    display: block; margin-top: 5px; 
    color: #3498db; font-weight: bold; font-size: 12px; 
}

/* 高亮广告样式 */
.highlight { border-left: 3px solid #e74c3c; padding-left: 10px; }

/* 底部翻页 */
.pagination-area {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 40px; padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
    font-family: sans-serif;
}
.page-btn {
    padding: 10px 20px;
    border: 1px solid #ddd;
    background: var(--ad-bg);
    border-radius: 20px;
    cursor: pointer;
    color: var(--text-color);
}
.page-btn.next {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

/* Footer */
.site-footer {
    text-align: center; margin-top: 50px;
    font-family: sans-serif; font-size: 11px; color: #999;
}
.footer-links span { margin: 0 5px; cursor: pointer; text-decoration: underline; }