/* ============================================
   MySIPCalc — Blog CSS
   ============================================ */

/* ---- Blog Index ---- */
.blog-hero{
  background:linear-gradient(135deg,#1a73e8 0%,#0d47a1 100%);
  color:#fff;padding:56px 0;text-align:center;
}
.blog-hero h1{color:#fff;margin-bottom:12px}
.blog-hero p{color:rgba(255,255,255,.8);font-size:17px;max-width:520px;margin:0 auto}

.blog-filters{
  display:flex;align-items:center;gap:10px;
  flex-wrap:wrap;margin-bottom:32px;
}
.filter-btn{
  padding:8px 18px;border-radius:20px;
  border:1px solid var(--border);background:var(--surface);
  font-size:13px;font-weight:600;color:var(--text-secondary);
  cursor:pointer;transition:var(--transition);
}
.filter-btn.active,.filter-btn:hover{
  background:var(--primary);color:#fff;border-color:var(--primary);
}

.blog-index-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.blog-index-card{
  background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-md);
  overflow:hidden;transition:var(--transition);
}
.blog-index-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.bic-img{
  height:200px;
  background:linear-gradient(135deg,var(--primary-light),#c5cae9);
  display:flex;align-items:center;justify-content:center;
  font-size:56px;
}
.bic-body{padding:22px}
.bic-meta{
  display:flex;align-items:center;gap:10px;
  margin-bottom:10px;font-size:12px;color:var(--text-secondary);
}
.bic-cat{
  background:var(--primary-light);color:var(--primary);
  padding:2px 10px;border-radius:20px;font-size:12px;font-weight:600;
}
.bic-body h3{font-size:17px;margin-bottom:10px;line-height:1.4}
.bic-body h3 a{color:var(--text-primary)}
.bic-body h3 a:hover{color:var(--primary)}
.bic-body p{font-size:14px;color:var(--text-secondary);line-height:1.65;margin-bottom:16px}
.bic-footer{
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;
}
.read-time{color:var(--text-secondary)}
.read-more{color:var(--primary);font-weight:600}

/* ---- Blog Post ---- */
.post-layout{
  display:grid;grid-template-columns:1fr 300px;gap:40px;
  align-items:start;
}
.post-main{}
.post-sidebar{position:sticky;top:84px}

.post-header{margin-bottom:32px}
.post-category{
  display:inline-block;background:var(--primary-light);color:var(--primary);
  padding:4px 14px;border-radius:20px;font-size:13px;font-weight:600;
  margin-bottom:14px;
}
.post-header h1{margin-bottom:16px;line-height:1.3}
.post-meta{
  display:flex;align-items:center;gap:16px;
  font-size:14px;color:var(--text-secondary);flex-wrap:wrap;
}
.post-meta span{display:flex;align-items:center;gap:5px}

.post-content{font-size:16px;line-height:1.85;color:var(--text-secondary)}
.post-content h2{color:var(--text-primary);margin:36px 0 14px;padding-top:8px;border-top:1px solid var(--border)}
.post-content h3{color:var(--text-primary);margin:24px 0 10px}
.post-content p{margin-bottom:18px}
.post-content ul,.post-content ol{padding-left:24px;margin-bottom:18px}
.post-content ul{list-style:disc}
.post-content ol{list-style:decimal}
.post-content li{margin-bottom:8px;color:var(--text-secondary)}
.post-content strong{color:var(--text-primary)}
.post-content table{width:100%;border-collapse:collapse;margin-bottom:20px;font-size:15px}
.post-content table th{
  background:var(--primary);color:#fff;
  padding:12px 16px;text-align:left;font-size:13px;
}
.post-content table td{padding:12px 16px;border-bottom:1px solid var(--border)}
.post-content table tr:nth-child(even) td{background:var(--bg)}
.post-content blockquote{
  border-left:4px solid var(--primary);
  padding:14px 20px;
  background:var(--primary-light);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  margin:20px 0;font-style:italic;color:var(--text-primary);
}
.post-content .formula-box{margin:20px 0}

/* ---- Embedded calculator in blog ---- */
.inline-calc{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  border-radius:var(--radius-md);padding:24px;margin:28px 0;
  color:#fff;
}
.inline-calc h3{color:#fff;margin-bottom:6px}
.inline-calc p{color:rgba(255,255,255,.8);margin-bottom:16px;font-size:14px}
.inline-calc .btn{width:100%;justify-content:center}

/* ---- Post sidebar ---- */
.sidebar-toc{}
.sidebar-toc .toc-title{
  font-size:13px;font-weight:700;text-transform:uppercase;
  letter-spacing:.06em;color:var(--text-secondary);margin-bottom:14px;
}
.toc-list li{margin-bottom:8px}
.toc-list li a{font-size:14px;color:var(--text-secondary);padding:4px 0;display:block;border-left:2px solid var(--border);padding-left:12px;transition:var(--transition)}
.toc-list li a:hover,.toc-list li a.active{color:var(--primary);border-color:var(--primary)}

.popular-posts-list .pop-post{
  display:flex;align-items:flex-start;gap:12px;
  padding:12px 0;border-bottom:1px solid var(--border);
}
.pop-post-num{
  font-size:24px;font-weight:800;color:var(--border);
  line-height:1;min-width:28px;
}
.pop-post a{font-size:14px;font-weight:600;color:var(--text-primary);line-height:1.4}
.pop-post a:hover{color:var(--primary)}
.pop-post-meta{font-size:12px;color:var(--text-secondary);margin-top:3px}

/* ---- Blog post footer ---- */
.post-tags{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  margin-top:32px;padding-top:24px;border-top:1px solid var(--border);
}
.post-tags .tag-label{font-size:14px;font-weight:600;color:var(--text-secondary)}
.post-tag{
  padding:5px 14px;border-radius:20px;
  border:1px solid var(--border);background:var(--bg);
  font-size:13px;color:var(--text-secondary);
  transition:var(--transition);
}
.post-tag:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}

.related-posts{margin-top:48px}
.related-posts h2{margin-bottom:24px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}

@media(max-width:1024px){
  .post-layout{grid-template-columns:1fr}
  .post-sidebar{position:relative;top:0}
  .blog-index-grid{grid-template-columns:repeat(2,1fr)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .blog-index-grid{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
}

/* ---- Blog Index page layout ---- */
.blog-page{padding:0 0 64px}
.blog-hero{
  background:linear-gradient(135deg,#1a73e8 0%,#0d47a1 100%);
  color:#fff;padding:56px 0;text-align:center;margin-bottom:36px;
}
.blog-hero h1{color:#fff;font-size:clamp(28px,5vw,42px);margin-bottom:12px}
.blog-hero p{color:rgba(255,255,255,.8);font-size:17px;max-width:520px;margin:0 auto}

/* Category filter tabs */
.blog-categories{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px}
.cat-btn{padding:8px 18px;border-radius:20px;border:1px solid var(--border);background:var(--surface);font-size:13px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}
.cat-btn.active,.cat-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Featured post */
.blog-featured{background:linear-gradient(135deg,var(--primary-light),#fff);border:2px solid var(--primary);border-radius:var(--radius-lg);padding:32px;margin-bottom:40px;position:relative}
.featured-badge{position:absolute;top:-12px;left:24px;background:var(--primary);color:#fff;font-size:12px;font-weight:700;padding:4px 14px;border-radius:20px}
.featured-content h2{font-size:clamp(18px,2.5vw,22px);margin:12px 0 10px}
.featured-content h2 a{color:var(--text-primary)}
.featured-content h2 a:hover{color:var(--primary)}
.featured-content p{color:var(--text-secondary);font-size:15px;line-height:1.7;margin-bottom:16px}
.read-btn{display:inline-block;padding:10px 22px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);font-size:14px;font-weight:700;text-decoration:none;transition:var(--transition)}
.read-btn:hover{background:#1557b0;transform:translateY(-1px);color:#fff}

/* Blog grid */
.blog-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-bottom:48px}
.blog-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:var(--transition)}
.blog-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.card-img{height:160px;display:flex;align-items:center;justify-content:center;font-size:52px}
.card-body{padding:20px}
.card-body h3{font-size:16px;margin:10px 0 8px;line-height:1.4}
.card-body h3 a{color:var(--text-primary)}
.card-body h3 a:hover{color:var(--primary)}
.card-body p{font-size:13px;color:var(--text-secondary);line-height:1.65;margin-bottom:12px}
.read-btn-sm{font-size:13px;font-weight:700;color:var(--primary);text-decoration:none}
.read-btn-sm:hover{text-decoration:underline}

/* Post-level styles */
.post-tag{display:inline-block;background:var(--primary-light);color:var(--primary);padding:3px 12px;border-radius:20px;font-size:12px;font-weight:700;margin-right:6px}
.post-date,.post-read{font-size:13px;color:var(--text-secondary)}
.post-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

/* Blog post page layout */
.blog-post-page{padding:40px 0 64px}

/* Post content article styles */
.post-main h1{font-size:clamp(22px,3.5vw,32px);line-height:1.3;margin:16px 0 20px}
.post-intro{font-size:17px;color:var(--text-secondary);line-height:1.8;background:var(--primary-light);padding:18px 20px;border-radius:var(--radius-sm);border-left:4px solid var(--primary);margin-bottom:32px}
.post-main h2{font-size:clamp(18px,2.5vw,22px);color:var(--text-primary);margin:36px 0 14px;padding-top:8px;border-top:1px solid var(--border)}
.post-main p{font-size:15px;color:var(--text-secondary);line-height:1.85;margin-bottom:16px}
.post-main ol,.post-main ul{color:var(--text-secondary);line-height:2;margin-bottom:16px}
.post-main strong{color:var(--text-primary)}

/* TOC in post */
.toc{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);padding:22px 26px;margin-bottom:32px}
.toc-title{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-bottom:12px}
.toc-list{padding-left:20px;list-style:decimal}
.toc-list li{margin-bottom:8px}
.toc-list li a{font-size:14px;color:var(--primary);text-decoration:none}
.toc-list li a:hover{text-decoration:underline}

/* Post callout */
.post-callout{background:var(--primary-light);border:1px solid var(--primary);border-radius:var(--radius-sm);padding:16px 20px;margin:20px 0;font-size:14px;color:var(--text-primary);line-height:1.7}
.post-callout a{color:var(--primary);font-weight:600}

/* Post table */
.post-table{width:100%;border-collapse:collapse;margin:16px 0 24px;font-size:14px}
.post-table thead th{background:var(--primary);color:#fff;padding:12px 14px;text-align:left;font-size:13px}
.post-table td{padding:12px 14px;border-bottom:1px solid var(--border);color:var(--text-secondary)}
.post-table tfoot td{font-weight:700;color:var(--text-primary);background:var(--primary-light)}
.post-table tr:hover td{background:var(--bg)}

/* Formula box in post */
.formula-box{background:var(--bg);border-left:4px solid var(--primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:16px 20px;font-family:'Courier New',monospace;font-size:13px;color:var(--text-primary);margin:16px 0;overflow-x:auto}

/* Sidebar links in post sidebar */
.sidebar-tool-link,.sidebar-article-link{display:block;padding:10px 0;font-size:14px;font-weight:600;color:var(--text-primary);border-bottom:1px solid var(--border);text-decoration:none;transition:var(--transition)}
.sidebar-tool-link:last-of-type,.sidebar-article-link:last-of-type{border-bottom:none}
.sidebar-tool-link:hover,.sidebar-article-link:hover{color:var(--primary)}

/* Blog CTA banner */
.blog-cta-banner{background:linear-gradient(135deg,#1a73e8,#0d47a1);border-radius:var(--radius-lg);padding:48px 32px;text-align:center;color:#fff;margin-top:48px}
.blog-cta-banner h2{color:#fff;font-size:clamp(20px,3vw,28px);margin-bottom:8px}
.blog-cta-banner p{color:rgba(255,255,255,.8);font-size:16px}

@media(max-width:768px){
  .blog-grid{grid-template-columns:1fr}
  .post-layout{grid-template-columns:1fr}
  .post-sidebar{position:relative;top:0}
}