/* theme1.css —— 蓝白正规科普风（站点1：经典蓝 #1565c0） */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    color: #1f2d3d; background: #ffffff; line-height: 1.85; font-size: 16px;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
.site-header { background: #1565c0; color: #fff; }
.site-header.simple { background: #1565c0; }
.site-header .wrap { display: flex; align-items: center; height: 58px; }
.logo { color: #fff; font-size: 20px; font-weight: 700; text-decoration: none; letter-spacing: 1px; }
.cat-nav { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
.cat-nav a { color: #d6e4ff; text-decoration: none; font-size: 15px; }
.cat-nav a.active { color: #fff; font-weight: 700; }
.cat-nav a:hover { color: #fff; }
.page-title { font-size: 26px; margin: 28px 0 8px; color: #1565c0; }
.page-intro { color: #5b6776; margin-bottom: 22px; font-size: 15px; }
.article-list { list-style: none; }
.article-item { background: #fff; border: 1px solid #e3e8ef; border-radius: 0; margin-bottom: 14px; transition: border-color .15s; }
.article-item:hover { border-color: #1565c0; }
.article-link { display: block; padding: 18px 20px; text-decoration: none; color: inherit; }
.article-title { font-size: 18px; color: #1565c0; margin-bottom: 8px; line-height: 1.5; }
.article-summary { color: #5b6776; font-size: 14px; margin-bottom: 10px; }
.article-date { color: #9aa6b2; font-size: 12px; }
.pager { display: flex; gap: 12px; align-items: center; justify-content: center; padding: 24px 0; color: #5b6776; font-size: 14px; }
.pager a { color: #1565c0; text-decoration: none; border: 1px solid #1565c0; padding: 6px 14px; border-radius: 0; }
.pager a:hover { background: #1565c0; color: #fff; }
.article-main { background: #fff; border: 1px solid #e3e8ef; border-radius: 0; padding: 28px 24px; margin-top: 20px; }
.article-main .article-title { font-size: 28px; color: #1565c0; margin-bottom: 18px; line-height: 1.4; }
.article-main p { margin-bottom: 18px; text-align: justify; color: #2d3a48; }
.article-foot-nav { margin: 24px 0; }
.article-foot-nav a { color: #1565c0; text-decoration: none; font-size: 14px; border: 1px solid #1565c0; padding: 7px 16px; border-radius: 0; display: inline-block; }
.article-foot-nav a:hover { background: #1565c0; color: #fff; }
.top-ad { position: relative; max-width: 860px; margin: 14px auto 0; padding: 0 16px; }
.top-ad img { width: 100%; display: block; border-radius: 0; border: 1px solid #e3e8ef; }
.ad-tag { position: absolute; right: 22px; top: 8px; background: rgba(21,101,192,.85); color: #fff; font-size: 11px; padding: 2px 7px; border-radius: 0; }
.soft-jump-bar { position: fixed; left: 0; right: 0; bottom: 0; background: #1565c0; color: #fff; display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; font-size: 14px; z-index: 50; }
.soft-jump-bar .jump-btn { background: #fff; color: #1565c0; padding: 9px 18px; border-radius: 0; text-decoration: none; font-weight: 700; }
.soft-jump-bar .jump-btn:hover { background: #e3e8ef; }
.site-footer { color: #9aa6b2; font-size: 12px; text-align: center; padding: 28px 16px; border-top: 1px solid #e3e8ef; margin-top: 30px; }
.site-footer p { margin: 4px 0; }