/* CaseTracker Auto — Blog SEO styles (đồng bộ app iOS, card 24px, shadow nhẹ) */
:root{ --card-radius:24px; }

/* Language switcher - Modern flag design */
.lang-switcher{display:inline-flex;gap:6px;align-items:center;background:rgba(11,95,255,.06);padding:4px;border-radius:12px;border:1px solid rgba(11,95,255,.1)}
.lang-btn{font-size:20px;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;transition:all .2s;opacity:.6;filter:grayscale(40%);line-height:1}
.lang-btn:hover{opacity:1;filter:grayscale(0);transform:scale(1.08);background:rgba(255,255,255,.5)}
.lang-btn.active{opacity:1;filter:grayscale(0);background:#fff;box-shadow:0 2px 8px rgba(11,95,255,.15)}

/* Breadcrumb */
.crumb{max-width:var(--maxw);margin:0 auto;padding:14px 18px 0;font-size:13px;color:var(--slate)}
.crumb a{color:var(--blue-dark)}
.crumb span{color:var(--slate)}

/* Category bar - Redesigned with smart grouping */
.catbar{position:sticky;top:62px;z-index:40;background:rgba(255,255,255,.95);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid rgba(11,95,255,.1);box-shadow:0 2px 12px rgba(11,95,255,.04)}
.catbar-inner{max-width:var(--maxw);margin:0 auto;display:flex;gap:10px;overflow-x:auto;padding:12px 18px;scrollbar-width:none;scroll-behavior:smooth;-webkit-overflow-scrolling:touch}
.catbar-inner::-webkit-scrollbar{display:none}

/* All categories chip - special style */
.catchip{flex:0 0 auto;font-size:13px;font-weight:600;color:var(--slate);background:rgba(11,95,255,.06);border:1px solid rgba(11,95,255,.12);padding:8px 16px;border-radius:10px;white-space:nowrap;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative}
.catchip:hover{background:rgba(11,95,255,.12);transform:translateY(-1px);box-shadow:0 2px 8px rgba(11,95,255,.1)}
.catchip.active{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-dark) 100%);color:#fff;border-color:transparent;box-shadow:0 3px 12px rgba(11,95,255,.3);transform:translateY(-1px)}

/* Primary categories (Family-based) - blue accent */
.catchip[href*="/f1/"],.catchip[href*="/f2a/"],.catchip[href*="/f2b/"],.catchip[href*="/f3/"],.catchip[href*="/f4/"],.catchip[href*="/ir1-cr1/"],.catchip[href*="/ir5/"]{background:rgba(11,95,255,.08);border-color:rgba(11,95,255,.15)}
.catchip[href*="/f1/"]:hover,.catchip[href*="/f2a/"]:hover,.catchip[href*="/f2b/"]:hover,.catchip[href*="/f3/"]:hover,.catchip[href*="/f4/"]:hover,.catchip[href*="/ir1-cr1/"]:hover,.catchip[href*="/ir5/"]:hover{background:rgba(11,95,255,.15)}

/* Secondary categories (Info & Tools) - purple accent */
.catchip[href*="/visa-bulletin/"],.catchip[href*="/cspa/"],.catchip[href*="/uscis/"],.catchip[href*="/nvc/"]{background:rgba(139,92,246,.08);border-color:rgba(139,92,246,.15);color:#6b21a8}
.catchip[href*="/visa-bulletin/"]:hover,.catchip[href*="/cspa/"]:hover,.catchip[href*="/uscis/"]:hover,.catchip[href*="/nvc/"]:hover{background:rgba(139,92,246,.15)}
.catchip[href*="/visa-bulletin/"].active,.catchip[href*="/cspa/"].active,.catchip[href*="/uscis/"].active,.catchip[href*="/nvc/"].active{background:linear-gradient(135deg,#8b5cf6 0%,#7c3aed 100%);color:#fff}

/* Tertiary categories (Process steps) - green accent */
.catchip[href*="/phong-van/"],.catchip[href*="/giay-to-bao-lanh/"]{background:rgba(34,197,94,.08);border-color:rgba(34,197,94,.15);color:#15803d}
.catchip[href*="/phong-van/"]:hover,.catchip[href*="/giay-to-bao-lanh/"]:hover{background:rgba(34,197,94,.15)}
.catchip[href*="/phong-van/"].active,.catchip[href*="/giay-to-bao-lanh/"].active{background:linear-gradient(135deg,#22c55e 0%,#16a34a 100%);color:#fff}

/* Category Dropdown */
.cat-dropdown{position:relative;flex:0 0 auto}
.cat-dropdown-btn{cursor:pointer;display:inline-flex;align-items:center;gap:6px;flex:0 0 auto;font-size:13px;font-weight:600;color:var(--slate);background:rgba(11,95,255,.06);border:1px solid rgba(11,95,255,.12);padding:8px 16px;border-radius:10px;white-space:nowrap;transition:all .2s cubic-bezier(.4,0,.2,1)}
.cat-dropdown-btn:hover{background:rgba(11,95,255,.12);transform:translateY(-1px);box-shadow:0 2px 8px rgba(11,95,255,.1)}
.cat-dropdown-btn svg{transition:transform .2s;opacity:.6}
.cat-dropdown.open .cat-dropdown-btn svg{transform:rotate(180deg)}
.cat-dropdown.has-active .cat-dropdown-btn{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-dark) 100%);color:#fff;border-color:transparent;box-shadow:0 3px 12px rgba(11,95,255,.3);transform:translateY(-1px)}

.cat-dropdown-panel{position:absolute;top:calc(100% + 8px);left:0;min-width:180px;background:#fff;border:1px solid rgba(11,95,255,.12);border-radius:12px;box-shadow:0 8px 24px rgba(11,95,255,.15);padding:8px;z-index:100}
.cat-dropdown-panel[hidden]{display:none}
.cat-dropdown.open .cat-dropdown-panel:not([hidden]){display:block;animation:dropdownFadeIn .2s ease}

@keyframes dropdownFadeIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}

.cat-dropdown-link{display:block;padding:10px 14px;color:var(--ink);font-size:13px;font-weight:600;border-radius:8px;transition:all .15s;white-space:nowrap;text-decoration:none}
.cat-dropdown-link:hover{background:rgba(11,95,255,.08);color:var(--blue)}
.cat-dropdown-link.active{background:rgba(11,95,255,.12);color:var(--blue-dark);font-weight:700}

/* Blog header */
.blog-head{max-width:var(--maxw);margin:0 auto;padding:26px 18px 6px}
.blog-head h1{font-size:clamp(24px,6vw,34px);letter-spacing:-.02em;margin:0 0 6px}
.blog-head p{color:var(--slate);margin:0;font-size:16px}

/* Search */
.blog-search{max-width:var(--maxw);margin:0 auto;padding:14px 18px}
.blog-search input{width:100%;font-size:15px;padding:12px 16px;border:1px solid var(--line);border-radius:14px;background:#fff}
.blog-search input:focus{outline:2px solid var(--blue);border-color:var(--blue)}
.search-results{margin-top:10px}

/* Featured */
.featured{max-width:var(--maxw);margin:0 auto;padding:6px 18px}
.featured a{display:block;border-radius:var(--card-radius);overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);transition:transform .18s}
.featured a:hover{transform:translateY(-3px)}
.featured img{width:100%;height:auto;aspect-ratio:1200/630;object-fit:cover;display:block;background:#eef3ff}
.featured .body{padding:18px}
.featured .body h2{margin:6px 0 8px;font-size:clamp(19px,4vw,26px);letter-spacing:-.02em}
.featured .body p{margin:0;color:var(--slate);font-size:15px}

/* Card grid */
.section-title{max-width:var(--maxw);margin:0 auto;padding:26px 18px 6px;font-size:18px;font-weight:800;letter-spacing:-.01em}
.cards{max-width:var(--maxw);margin:0 auto;padding:8px 18px 10px;display:grid;grid-template-columns:1fr;gap:18px}
.card{border-radius:var(--card-radius);overflow:hidden;border:1px solid var(--line);background:#fff;transition:transform .18s,box-shadow .18s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card a{color:inherit;display:block}
.card img{width:100%;height:auto;aspect-ratio:1200/630;object-fit:cover;display:block;background:#eef3ff}
.card .body{padding:16px}
.card .cat{font-size:11px;font-weight:800;color:var(--blue);text-transform:uppercase;letter-spacing:.04em}
.card h3{margin:6px 0 8px;font-size:17px;line-height:1.3;letter-spacing:-.01em}
.card .excerpt{margin:0 0 10px;color:var(--slate);font-size:14px}
.card .meta{display:flex;gap:10px;font-size:12px;color:#8291a8}

/* Tags */
.tagcloud{max-width:var(--maxw);margin:0 auto;padding:12px 18px 30px;display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:12px;color:var(--blue-dark);background:#eef3ff;border:1px solid #dbe6ff;padding:5px 11px;border-radius:999px}
.tag:hover{background:#dbe6ff}

/* Pagination */
.pager{max-width:var(--maxw);margin:0 auto;padding:10px 18px 40px;display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.pager a,.pager span{min-width:40px;text-align:center;padding:9px 12px;border-radius:12px;border:1px solid var(--line);font-weight:600;font-size:14px;color:var(--ink)}
.pager a:hover{border-color:var(--blue);color:var(--blue-dark)}
.pager .cur{background:var(--blue);color:#fff;border-color:var(--blue)}
.pager .disabled{opacity:.4;pointer-events:none}

/* Article */
.article{max-width:760px;margin:0 auto;padding:10px 18px 30px}
.article .cat{font-size:12px;font-weight:800;color:var(--blue);text-transform:uppercase;letter-spacing:.05em}
.article h1{font-size:clamp(26px,6vw,38px);line-height:1.15;letter-spacing:-.02em;margin:8px 0 12px}
.article .meta{display:flex;flex-wrap:wrap;gap:12px;color:#8291a8;font-size:13px;margin-bottom:18px}
.article .meta .stat-views,.article .meta .stat-likes{display:inline-flex;align-items:center;gap:4px}
.article .meta .stat-views svg,.article .meta .stat-likes svg{opacity:.7}
.article .hero-img{width:100%;height:auto;aspect-ratio:1200/630;object-fit:cover;border-radius:var(--card-radius);display:block;margin-bottom:22px;background:#eef3ff;box-shadow:var(--shadow)}
.article .content{font-size:17px;line-height:1.75;color:#1e2a3d}
.article .content h2{font-size:22px;letter-spacing:-.01em;margin:28px 0 10px}
.article .content h3{font-size:19px;margin:22px 0 8px}
.article .content p{margin:0 0 16px}
.article .content ul,.article .content ol{margin:0 0 16px;padding-left:22px}
.article .content a{color:var(--blue-dark);text-decoration:underline}
.article .hashtags{margin:22px 0;display:flex;flex-wrap:wrap;gap:8px}
.article .hashtags .tag{font-size:12px;color:var(--blue-dark);background:#eef3ff;border:1px solid #dbe6ff;padding:5px 11px;border-radius:999px}

/* Social share buttons */
.article-share{margin:30px 0;padding:20px;background:rgba(11,95,255,.04);border:1px solid rgba(11,95,255,.1);border-radius:16px;display:flex;flex-direction:column;gap:12px;align-items:center}
.share-label{font-size:14px;font-weight:600;color:var(--slate)}
.share-buttons{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.share-btn{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;border:1px solid rgba(11,95,255,.15);background:#fff;color:var(--slate);transition:all .2s;cursor:pointer}
.share-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(11,95,255,.15)}
.share-fb{color:#1877f2}
.share-fb:hover{background:#1877f2;color:#fff;border-color:#1877f2}
.share-tw{color:#1da1f2}
.share-tw:hover{background:#1da1f2;color:#fff;border-color:#1da1f2}
.share-li{color:#0a66c2}
.share-li:hover{background:#0a66c2;color:#fff;border-color:#0a66c2}
.share-email{color:#8b5cf6}
.share-email:hover{background:#8b5cf6;color:#fff;border-color:#8b5cf6}
.share-copy{color:var(--slate)}
.share-copy:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.share-like{color:#ef4444}
.share-like:hover{background:#ef4444;color:#fff;border-color:#ef4444}
.share-like.liked{background:#ef4444;color:#fff;border-color:#ef4444}
.share-like.liked svg{fill:currentColor}

/* CTA về app */
.app-cta{max-width:760px;margin:30px auto;padding:26px;border-radius:var(--card-radius);color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--blue-900));box-shadow:var(--shadow)}
.app-cta h3{margin:0 0 8px;font-size:22px;letter-spacing:-.01em}
.app-cta p{margin:0 0 14px;opacity:.92;font-size:15px}
.app-cta ul{margin:0 0 18px;padding-left:20px}
.app-cta li{margin:4px 0;opacity:.95}
.app-cta .store{background:#fff;color:var(--blue-dark)}
.app-cta .store small{color:#5b6b86;opacity:1}
.app-cta .store strong{color:var(--blue-dark)}

/* Related */
.related{max-width:760px;margin:0 auto;padding:6px 18px 40px}
.related h3{font-size:18px;margin:0 0 12px}
.related-list{display:grid;grid-template-columns:1fr;gap:12px}
.related-list a{display:flex;gap:12px;align-items:center;border:1px solid var(--line);border-radius:16px;padding:10px;background:#fff}
.related-list img{width:84px;height:auto;aspect-ratio:1200/630;object-fit:cover;border-radius:10px;background:#eef3ff}
.related-list b{font-size:14px;line-height:1.3}

@media (min-width:760px){
  .cards{grid-template-columns:repeat(3,1fr)}
  .featured a{display:grid;grid-template-columns:1.2fr 1fr;align-items:stretch}
  .featured img{height:100%}
  .related-list{grid-template-columns:1fr 1fr}
  .catbar{top:62px}
}

/* Search page styles */
.search-page .blog-search{padding:14px 18px 30px}
.search-page .filters{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.search-page .filters label{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--slate);background:rgba(11,95,255,.06);border:1px solid rgba(11,95,255,.12);padding:8px 14px;border-radius:10px;cursor:pointer;transition:all .2s}
.search-page .filters label:hover{background:rgba(11,95,255,.12)}
.search-page .filters input[type=checkbox]{margin:0;width:16px;height:16px;cursor:pointer}
.search-page .filters input[type=checkbox]:checked + span{color:var(--blue-dark)}
.search-page .filters label:has(input:checked){background:linear-gradient(135deg,var(--blue) 0%,var(--blue-dark) 100%);color:#fff;border-color:transparent}
.search-stats{color:var(--slate);font-size:14px;margin:12px 0}

/* Core Web Vitals optimizations */
img{content-visibility:auto}
.hero-bg,.band-bg{will-change:transform}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* About & Contact Pages */
.page-content{max-width:860px;margin:0 auto;padding:40px 18px}
.page-content h1{font-size:clamp(28px,6vw,42px);letter-spacing:-.02em;margin:0 0 12px}
.page-content .lede{font-size:18px;color:var(--slate);margin:0 0 40px;line-height:1.6}
.page-content .content-section{margin:32px 0}
.page-content .content-section h2{font-size:24px;letter-spacing:-.01em;margin:0 0 12px;color:var(--blue-dark)}
.page-content .content-section p{font-size:17px;line-height:1.75;color:#1e2a3d;margin:0 0 16px}
.page-content .content-section ul{margin:0 0 16px;padding-left:24px;font-size:17px;line-height:1.75;color:#1e2a3d}
.page-content .content-section li{margin:8px 0}
.page-content .contact-info{text-align:center}
.page-content .contact-info h3{margin:0 0 12px;font-size:18px;color:var(--slate)}
.page-content .app-promo{margin:32px 0}
.page-content .app-promo a{font-weight:600;color:var(--blue-dark);text-decoration:underline}
.page-content .stores.center{justify-content:center}

/* About & Contact specific sections */
.about-section{margin:40px 0;padding:32px 0;border-top:1px solid #e1e8f0}
.about-section:first-of-type{border-top:none;padding-top:0}
.about-section h2{font-size:24px;letter-spacing:-.01em;margin:0 0 12px;color:var(--blue-dark)}
.about-section p{font-size:17px;line-height:1.75;color:#1e2a3d;margin:0 0 16px}
.about-section ul{margin:0 0 24px;padding-left:24px;font-size:17px;line-height:1.75;color:#1e2a3d}
.about-section ul li{margin:8px 0}
.about-section .btn{margin-top:12px}

.contact-section{margin:40px 0;padding:32px 0;border-top:1px solid #e1e8f0}
.contact-section:first-of-type{border-top:none;padding-top:0}
.contact-section h2{font-size:24px;letter-spacing:-.01em;margin:0 0 12px;color:var(--blue-dark)}
.contact-section p{font-size:17px;line-height:1.75;color:#1e2a3d;margin:0 0 16px}

.contact-box{background:linear-gradient(135deg,#eef4ff 0%,#f5f9ff 100%);border:1px solid #d0e1ff;border-left:4px solid var(--blue);border-radius:12px;padding:24px;margin:16px 0}
.email-link{display:inline-flex;align-items:center;gap:12px;font-size:20px;font-weight:600;color:var(--blue);text-decoration:none;transition:color .2s}
.email-link:hover{color:var(--blue-dark)}
.email-link svg{flex-shrink:0}

.page-content .stores{margin:24px 0}

/* Contextual Links (Smart internal linking) */
.contextual-links{margin:20px 0;padding:16px 20px;background:linear-gradient(135deg,#eef4ff 0%,#f5f9ff 100%);border:1px solid #d0e1ff;border-left:4px solid var(--blue);border-radius:12px}
.contextual-links p{margin:0;font-size:15px;color:var(--ink);line-height:1.6}
.contextual-links strong{color:var(--blue-dark);font-weight:700}
.contextual-links a{color:var(--blue);font-weight:600;text-decoration:none;transition:all .2s;border-bottom:1px solid transparent}
.contextual-links a:hover{color:var(--blue-dark);border-bottom-color:var(--blue-dark)}

/* Search Page - Enhanced Design */
.search-page-body{background:linear-gradient(180deg,#f8faff 0%,#fff 500px)}
.search-page .wrap{max-width:1200px}

.search-box-large{position:relative;max-width:720px;margin:0 auto 40px}
.search-box-large svg{position:absolute;left:20px;top:50%;transform:translateY(-50%);color:var(--slate);opacity:.5;pointer-events:none}
.search-box-large input{width:100%;font-size:17px;padding:18px 20px 18px 56px;border:2px solid rgba(11,95,255,.15);border-radius:16px;background:#fff;box-shadow:0 4px 24px rgba(11,95,255,.08);transition:all .3s}
.search-box-large input:focus{outline:none;border-color:var(--blue);box-shadow:0 8px 32px rgba(11,95,255,.15)}

.search-results-area{max-width:1200px;margin:0 auto;min-height:100px}
.no-results{text-align:center;padding:60px 20px;color:var(--slate)}
.no-results p{font-size:16px;margin:0}

.search-categories,.search-latest{max-width:1200px;margin:60px auto;padding:0 18px}
.search-categories h2,.search-latest h2{font-size:24px;letter-spacing:-.01em;margin:0 0 24px;color:var(--ink)}

.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.category-card{display:block;padding:24px 20px;background:#fff;border:1px solid var(--line);border-radius:16px;transition:all .25s;text-align:center}
.category-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(11,95,255,.12);border-color:var(--blue)}
.category-card h3{margin:0 0 8px;font-size:17px;color:var(--ink)}
.category-card span{font-size:13px;color:var(--slate)}

@media (min-width:760px){
  .search-box-large input{font-size:18px;padding:20px 24px 20px 60px}
  .category-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
  .category-card{padding:28px 24px}
  .category-card h3{font-size:18px}
}