:root{
  --navy:#07112b;--blue:#1246c6;--mid:#2460eb;--bright:#3b82f6;
  --sky:#38bdf8;--bg:#f0f6ff;--surface:#fff;--text:#0f172a;
  --muted:#64748b;--border:rgba(36,96,235,0.13);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;}
h1,h2,h3,h4{font-family:'Sora',sans-serif;color:var(--navy);}
a{text-decoration:none;color:var(--blue);}
img{max-width:100%;display:block;border-radius:12px;}

/* ===== Back link ===== */
.blog-back{display:inline-block;font-size:14px;font-weight:600;color:var(--mid);margin-bottom:24px;}
.blog-back:hover{opacity:0.75;}

/* ===== Listing page ===== */
.blog-index-wrap{max-width:1000px;margin:0 auto;padding:48px 24px 80px;}
.blog-index-wrap h1{font-size:clamp(30px,5vw,44px);font-weight:800;letter-spacing:-1px;}
.blog-index-sub{color:var(--muted);font-size:16px;margin-top:8px;margin-bottom:40px;}
.blog-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;}
.blog-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden;transition:transform .25s,box-shadow .25s;}
.blog-card:hover{transform:translateY(-4px);box-shadow:0 14px 40px rgba(36,96,235,0.13);}
.blog-card-img{width:100%;height:170px;object-fit:cover;border-radius:0;}
.blog-card-img-placeholder{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--navy),var(--mid));color:#fff;font-family:'Sora',sans-serif;font-weight:800;font-size:18px;letter-spacing:1px;}
.blog-card-body{padding:18px 20px 22px;}
.blog-card-body h2{font-size:17px;font-weight:700;line-height:1.4;margin-bottom:8px;}
.blog-card-body p{font-size:13.5px;color:var(--muted);line-height:1.6;}

/* ===== Single post page ===== */
.blog-post-wrap{max-width:760px;margin:0 auto;padding:48px 24px 90px;}
.blog-cover-img{width:100%;max-height:380px;object-fit:cover;margin:20px 0 32px;}
.blog-post h1{font-size:clamp(28px,4.5vw,40px);font-weight:800;letter-spacing:-0.8px;line-height:1.2;margin-bottom:8px;}
.blog-post h2{font-size:24px;font-weight:700;margin:36px 0 14px;}
.blog-post h3{font-size:19px;font-weight:700;margin:26px 0 10px;color:var(--mid);}
.blog-post p{font-size:16px;color:#334155;margin-bottom:16px;}
.blog-post ul{margin:0 0 16px 20px;}
.blog-post li{font-size:16px;color:#334155;margin-bottom:8px;line-height:1.65;}
.blog-post strong{color:var(--navy);}
.blog-post code{background:#f1f5f9;padding:2px 6px;border-radius:5px;font-size:14px;color:var(--mid);}


/* ===== Logo + Byline ===== */
.blog-logo-link{display:inline-block;margin-bottom:16px;}
.blog-logo{height:36px;width:36px;object-fit:contain;border-radius:8px;}
.blog-byline{margin-top:40px;padding-top:20px;border-top:1px solid var(--border);}
.blog-byline p{font-size:13.5px;color:var(--muted);margin-bottom:4px;}
.blog-byline strong{color:var(--navy);}


/* ===== Share buttons ===== */
.blog-share{margin-top:36px;padding:20px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.blog-share-label{display:block;font-size:13px;font-weight:700;color:var(--navy);margin-bottom:12px;}
.blog-share-btns{display:flex;gap:10px;flex-wrap:wrap;}
.share-btn{display:inline-flex;align-items:center;justify-content:center;padding:9px 18px;border-radius:999px;font-size:13px;font-weight:700;font-family:'Inter',sans-serif;border:none;cursor:pointer;color:#fff;transition:opacity 0.2s,transform 0.2s;}
.share-btn:hover{opacity:0.88;transform:translateY(-2px);}
.share-btn.wa{background:#25D366;}
.share-btn.li{background:#0A66C2;}
.share-btn.tw{background:#000;}
.share-btn.copy{background:var(--mid);}