/* 新增版本对照及相关阅读采用官网现有色彩、容器和卡片语言。 */
.versions-page{padding:140px 20px 48px;color:var(--text-primary)}
.versions-page *, .seo-related *{box-sizing:border-box}
.versions-heading{text-align:center;padding:2rem 0;margin-bottom:24px}
.versions-heading h1{display:flex;align-items:center;justify-content:center;gap:12px;font-size:2.5rem;margin:0 0 .5rem;line-height:1.4}
.versions-heading p{font-size:1.1rem;color:var(--text-secondary);margin:0;line-height:1.8}
.versions-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;margin-bottom:36px}
.seo-version-card{display:flex;flex-direction:column;overflow:hidden;text-decoration:none;color:var(--text-primary);background:var(--bg-card);border:1px solid var(--border-color);border-radius:16px;transition:border-color .18s,background .18s}
.seo-version-card:hover{background:var(--bg-card-hover);border-color:var(--accent-primary)}
.seo-version-card-cover{position:relative;height:220px;overflow:hidden;background:rgba(0,0,0,.25)}
.seo-version-card-cover img{display:block;width:100%;height:100%;object-fit:cover}
.seo-version-card-cover:after{content:'';position:absolute;inset:0;background:linear-gradient(transparent 50%,rgba(0,0,0,.3))}
.seo-version-badge{display:inline-flex;align-items:center;white-space:nowrap;font-size:11px;font-weight:600;line-height:1.5;padding:3px 8px;border-radius:5px;background:var(--bg-card);color:var(--text-secondary)}
.seo-version-badge.is-classic{color:#fff;background:#08a6df}
.seo-version-badge.is-modern{color:#fff;background:#f47716}
.seo-version-card-cover .seo-version-badge{position:absolute;right:16px;top:16px;z-index:1;font-size:13px;padding:5px 10px}
.seo-version-card-body{display:flex;flex-direction:column;flex:1;padding:24px}
.seo-version-card-body h2{font-size:22px;margin:0 0 12px;line-height:1.5}
.seo-version-card-body p{font-size:15px;color:var(--text-secondary);margin:0 0 20px;line-height:1.8;overflow-wrap:anywhere}
.seo-version-card-action{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:16px;border-top:1px solid var(--border-color);font-size:14px;color:var(--text-primary)}
.version-comparison{border:1px solid var(--border-color);border-radius:16px;overflow:hidden;background:var(--bg-card)}
.version-comparison-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px}
.version-comparison-heading h2{font-size:20px;margin:0}
.version-comparison-heading p{font-size:13px;color:var(--text-secondary);margin:0}
.version-comparison-row{display:grid;grid-template-columns:140px repeat(2,minmax(0,1fr));border-top:1px solid var(--border-color);margin:0}
.version-comparison-row>h3,.version-comparison-row>div,.version-comparison-labels>span,.version-comparison-labels>strong{padding:20px 24px;margin:0;min-width:0}
.version-comparison-row h3{font-size:14px;font-weight:500;color:var(--text-secondary)}
.version-comparison-row>div{border-left:1px solid var(--border-color)}
.version-comparison-row p{margin:0;font-size:14px;line-height:1.9;overflow-wrap:anywhere}
.version-comparison-labels{background:rgba(0,0,0,.15);font-size:14px}
.version-comparison-labels>span{color:var(--text-secondary)}
.version-mobile-label{display:none}
.version-source-note{display:flex;align-items:baseline;gap:9px;color:var(--text-secondary);font-size:12px;line-height:1.8;margin:20px 0 0}
.seo-related{margin:0 0 40px;padding:24px 0 0;border-top:1px solid var(--border-color);color:var(--text-primary)}
.seo-related-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}
.seo-related-heading h2{font-size:20px;line-height:1.5;margin:0}
.seo-related-heading>a{font-size:13px;color:var(--text-secondary);text-decoration:none}
.seo-related-heading>a:hover{color:var(--text-primary)}
.seo-related-list{list-style:none!important;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 20px;margin:0!important;padding:0!important}
.seo-related-list>li{min-width:0;margin:0;padding:0}
.seo-related-link{display:block;height:100%;padding:16px 18px;border-radius:12px;border:1px solid var(--border-color);background:var(--bg-card);color:var(--text-primary);text-decoration:none;transition:background .18s,border-color .18s}
.seo-related-link:hover{border-color:var(--accent-primary);background:var(--bg-card-hover)}
.seo-related-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:11px;line-height:1.6;color:var(--text-secondary);margin-bottom:10px}
.seo-related-meta time{margin-left:auto;font-variant-numeric:tabular-nums}
.seo-related-title{display:flex;align-items:baseline;justify-content:space-between;gap:14px;font-size:15px;line-height:1.7;overflow-wrap:anywhere}
.seo-related-title>span{color:var(--text-secondary);flex:none}
.versions-page a:focus-visible,.seo-related a:focus-visible{outline:2px solid var(--accent-primary);outline-offset:4px}
@media(max-width:650px){
 .versions-page{padding:108px 16px 32px}
 .versions-heading{padding:20px 0;margin-bottom:20px}
 .versions-heading h1{font-size:28px}
 .versions-heading p{font-size:14px}
 .versions-cards{grid-template-columns:1fr;gap:20px;margin-bottom:24px}
 .seo-version-card-cover{height:190px}
 .seo-version-card-body{padding:20px}
 .seo-version-card-body h2{font-size:20px}
 .version-comparison-heading{align-items:flex-start;flex-direction:column;gap:8px;padding:20px}
 .version-comparison-heading h2{font-size:18px}
 .version-comparison-labels{display:none}
 .version-comparison-row{grid-template-columns:1fr 1fr}
 .version-comparison-row>h3{grid-column:1/-1;padding:14px 16px 0;color:var(--text-primary);font-weight:600}
 .version-comparison-row>div{padding:12px 16px 18px;border-left:0}
 .version-comparison-row>div+div{border-left:1px solid var(--border-color)}
 .version-comparison-row p{font-size:13px}
 .version-mobile-label{display:block;color:var(--text-secondary);font-size:11px;margin-bottom:8px}
 .seo-related{padding-top:20px;margin-bottom:28px}
 .seo-related-heading{align-items:flex-start;gap:8px;flex-wrap:wrap}
 .seo-related-heading h2{font-size:18px}
 .seo-related-heading>a{font-size:12px;padding:4px 0}
 .seo-related-list{grid-template-columns:1fr;gap:10px}
 .seo-related-link{padding:14px 16px}
}
@media(prefers-reduced-motion:reduce){.seo-version-card,.seo-related-link{transition:none}}