:root { 
            --primary-color: #e53935; 
            --text-color: #333; 
            --bg-color: #f6f1e7; /* 默认护眼背景色 */
            --box-bg: #fff;
            --font-size: 18px;
        }

body { font-family: 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; color: var(--text-color); background-color: var(--bg-color); line-height: 1.8; transition: background-color 0.3s, color 0.3s; }

.container { max-width: 900px; margin: 0 auto; padding: 0 15px; }

header { background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }

.header-inner { display: flex; justify-content: space-between; align-items: center; height: 50px; max-width: 1200px; margin: 0 auto; padding: 0 15px; }

.logo { font-size: 20px; font-weight: bold; color: var(--primary-color); }

.nav-links a { font-size: 15px; transition: all 0.3s; }

.nav-links a:hover { color: var(--primary-color); }

main { padding: 20px 0; min-height: 80vh; }

.breadcrumb { padding: 10px 0; margin-bottom: 10px; font-size: 14px; color: #666; border-bottom: 1px solid #ddd; }

.read-settings { display: flex; justify-content: flex-end; gap: 15px; margin-bottom: 20px; align-items: center; font-size: 14px; }

.color-btn { display: inline-block; width: 24px; height: 24px; border-radius: 50%; border: 2px solid #ccc; cursor: pointer; }

.color-btn.active { border-color: var(--primary-color); }

.bg-light { background-color: #f6f1e7; }

.bg-dark { background-color: #1a1a1a; }

.bg-green { background-color: #e1ecd1; }

.font-btn { cursor: pointer; border: 1px solid #ccc; padding: 2px 8px; border-radius: 4px; background: #fff; }

.article-wrap { padding: 30px; background-color: rgba(255,255,255,0.5); border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.02); }

.article-title { font-size: 28px; font-weight: bold; text-align: center; margin-bottom: 15px; color: var(--text-color); }

.article-meta { text-align: center; font-size: 13px; color: #888; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px dashed #ccc; }

.article-meta span { margin: 0 10px; }

.article-content { font-size: var(--font-size); color: var(--text-color); }

.article-content p { margin-bottom: 1.5em; text-indent: 2em; text-align: justify; word-break: break-all; }

.read-nav { display: flex; justify-content: space-between; margin-top: 40px; padding-top: 20px; border-top: 1px dashed #ccc; }

.read-nav a { flex: 1; text-align: center; padding: 12px 0; background: #fff; margin: 0 10px; border-radius: 4px; border: 1px solid #ddd; transition: 0.3s; font-size: 16px; }

.read-nav a:hover { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }

footer { background: #fff; color: #888; text-align: center; padding: 20px 0; margin-top: 30px; font-size: 14px; border-top: 1px solid #eee; }

/* Night mode overrides */
        body.night-mode { --bg-color: #1a1a1a; --text-color: #999; --box-bg: #222; }

body.night-mode .article-wrap { background-color: transparent; border: 1px solid #333; }

body.night-mode header, body.night-mode footer { background: #222; border-color: #333; }

body.night-mode .breadcrumb { border-color: #333; color: #777; }

body.night-mode .breadcrumb a { color: #999; }

body.night-mode .read-nav a { background: #222; border-color: #444; color: #999; }

body.night-mode .read-nav a:hover { background: var(--primary-color); color: #fff; }

body.night-mode .font-btn { background: #333; border-color: #555; color: #ccc; }

/* Green mode */
        body.green-mode { --bg-color: #e1ecd1; }

@media (max-width: 768px) {
            .nav-links { display: none; }
            .article-wrap { padding: 15px; }
            .article-title { font-size: 22px; }
            .read-nav a { font-size: 14px; margin: 0 5px; padding: 10px 0; }
            .read-settings { justify-content: center; flex-wrap: wrap; }
        }