/* ============ ai2up 博客内容中心 ============ */

/* blog list page */
.blog-hero{position:relative;padding:60px 0 30px;background:var(--bg-alt);overflow:hidden}
.blog-hero__bg{position:absolute;inset:0;background:
  radial-gradient(50% 60% at 90% 0%,rgba(6,182,212,.14),transparent 60%),
  radial-gradient(45% 55% at 5% 10%,rgba(99,102,241,.16),transparent 60%)}
.blog-hero__inner{position:relative;max-width:760px}
.blog-hero h1{font-size:clamp(30px,5vw,46px);font-weight:900;letter-spacing:-.02em;line-height:1.15;margin:14px 0 14px}
.blog-hero p{color:var(--muted);font-size:17px;max-width:600px}

.post-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.blog-intro{max-width:760px;margin:0 0 14px;color:var(--muted);font-size:16px;line-height:1.7}
.blog-intro b{color:var(--ink)}
.blog-path{margin:0 0 30px;padding-left:22px;color:var(--muted);font-size:15.5px;line-height:2}
.blog-path b{color:var(--ink)}
.blog-path a{color:var(--indigo);font-weight:600}
.post-card{background:#fff;border:1px solid var(--line);border-radius:var(--18px);padding:26px;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s,border-color .2s}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--indigo)}
.post-card__tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.post-card__tag{font-size:11.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--indigo);background:var(--grad-soft);padding:4px 10px;border-radius:6px}
.post-card h2{font-size:20px;font-weight:800;letter-spacing:-.01em;line-height:1.35;margin-bottom:10px}
.post-card h2 a{color:var(--ink)}
.post-card h2 a:hover{color:var(--indigo)}
.post-card__excerpt{color:var(--muted);font-size:14.5px;line-height:1.65;margin-bottom:18px;flex:1}
.post-card__meta{display:flex;gap:14px;font-size:12.5px;color:var(--muted);align-items:center}
.post-card__meta b{color:var(--ink-2);font-weight:600}
.post-card__more{margin-top:14px;color:var(--indigo);font-weight:700;font-size:14px}

/* post article page */
.post{max-width:760px;margin:0 auto;padding:0 24px}
.post__back{font-size:13.5px;color:var(--muted);margin:36px 0 6px}
.post__back:hover{color:var(--indigo)}
.post__tags{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 14px}
.post__tag{font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:var(--grad);padding:4px 12px;border-radius:6px}
.post__title{font-size:clamp(30px,5vw,44px);font-weight:900;letter-spacing:-.02em;line-height:1.2;margin-bottom:16px}
.post__lead{font-size:18px;color:var(--ink-2);line-height:1.7;margin-bottom:24px}
.post__meta{display:flex;gap:18px;font-size:14px;color:var(--muted);padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:32px;flex-wrap:wrap}
.post__meta b{color:var(--ink-2);font-weight:600}

.post__body{font-size:17px;line-height:1.85;color:var(--ink-2)}
.post__body h2{font-size:26px;font-weight:900;letter-spacing:-.01em;color:var(--ink);margin:1.6em 0 .5em;line-height:1.3}
.post__body h3{font-size:20px;font-weight:800;color:var(--ink);margin:1.4em 0 .4em}
.post__body p{margin-bottom:1.1em}
.post__body ul,.post__body ol{margin:0 0 1.2em 1.4em}
.post__body li{margin-bottom:.45em}
.post__body blockquote{margin:1.4em 0;padding:14px 22px;border-left:4px solid var(--indigo);background:var(--bg-alt);border-radius:0 12px 12px 0;color:var(--ink-2);font-style:italic}
.post__body code{background:#f1f5f9;padding:2px 8px;border-radius:6px;font-size:.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.post__body pre{background:#0b1220;color:#e2e8f0;padding:18px 22px;border-radius:14px;overflow-x:auto;margin:1.2em 0;font-size:14px;line-height:1.6}
.post__body pre code{background:transparent;color:inherit;padding:0;font-size:inherit}
.post__body strong{color:var(--ink)}
.post__body a{color:var(--indigo);border-bottom:1px solid rgba(99,102,241,.3)}
.post__body a:hover{border-color:var(--indigo)}

.post__cta{margin:48px 0;background:var(--grad);border-radius:20px;padding:32px;color:#fff;text-align:center;position:relative;overflow:hidden}
.post__cta::before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;background:rgba(255,255,255,.12);border-radius:50%}
.post__cta h3{font-size:22px;font-weight:900;margin-bottom:10px;position:relative}
.post__cta p{font-size:15px;opacity:.92;margin-bottom:20px;position:relative}
.post__cta .btn{position:relative;background:#fff;color:var(--indigo)}

.post__related{margin:48px 0 60px;padding-top:36px;border-top:1px solid var(--line)}
.post__related h3{font-size:18px;font-weight:800;margin-bottom:18px}
.post__related-list{display:flex;flex-direction:column;gap:14px}
.post__related-item{display:flex;gap:16px;justify-content:space-between;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;transition:border-color .2s,transform .2s}
.post__related-item:hover{border-color:var(--indigo);transform:translateY(-2px)}
.post__related-item h4{font-size:16px;font-weight:800;margin-bottom:4px}
.post__related-item span{font-size:12.5px;color:var(--muted)}
.post__related-item b{color:var(--indigo);white-space:nowrap;font-size:14px}

/* rss / footer note */
.blog-rss{text-align:center;margin-top:48px;color:var(--muted);font-size:14.5px}
.blog-rss p{margin:0 0 8px}
.blog-rss a{color:var(--indigo);font-weight:700;border-bottom:1px solid rgba(99,102,241,.3)}
.blog-rss a:hover{border-bottom-color:var(--indigo)}
.blog-rss__hint{font-size:13.5px;opacity:.9}

@media(max-width:680px){
  .post-grid{grid-template-columns:1fr}
  .post__body{font-size:16.5px}
  .post__related-item{flex-direction:column;align-items:flex-start}
}