:root{--b-blue:#2563eb;--b-cyan:#0ea5e9;--b-navy:#07122b;--b-pink:#e91e63;--b-text:#334155;--b-muted:#64748b;--b-line:#dbe7f6;--b-bg:#f4f8ff;--b-shadow:0 24px 70px rgba(15,23,42,.13);--b-max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body.hrs-blog-v383{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:#fff;color:var(--b-text);line-height:1.7;overflow-x:hidden}body.hrs-blog-v383 a{text-decoration:none;color:inherit}.hrb-container{width:min(var(--b-max),calc(100% - 40px));margin:auto}.hrb-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.94);backdrop-filter:blur(18px);border-bottom:1px solid var(--b-line)}.hrb-nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}.hrb-logo img{height:58px;width:auto;display:block}.hrb-nav nav{display:flex;align-items:center;gap:18px;font-weight:900;color:#0f172a}.hrb-nav nav a:hover{color:var(--b-blue)}.hrb-nav-cta{padding:10px 16px;border-radius:999px;background:#0f172a!important;color:#fff!important}.hrb-hero{position:relative;overflow:hidden;padding:94px 0 76px;background:radial-gradient(circle at 15% 10%,rgba(233,30,99,.14),transparent 34%),radial-gradient(circle at 90% 8%,rgba(37,99,235,.22),transparent 36%),linear-gradient(180deg,#fff,#f4f8ff)}.hrb-hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(15,23,42,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(15,23,42,.04) 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(to bottom,#000,transparent 85%);pointer-events:none}.hrb-hero .hrb-container{position:relative}.hrb-kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;background:#eaf2ff;color:var(--b-blue);font-size:13px;font-weight:950;text-transform:uppercase}.hrb-kicker:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--b-pink)}.hrb-hero h1{margin:18px 0 12px;color:var(--b-navy);font-size:clamp(42px,7vw,86px);line-height:.98;letter-spacing:-.06em}.hrb-hero p{max-width:820px;font-size:19px;color:#475569}.hrb-search-wrap{display:grid;grid-template-columns:1fr 260px;gap:12px;margin-top:30px;max-width:860px}.hrb-search-wrap input,.hrb-search-wrap select{border:1px solid #bfdbfe;border-radius:18px;background:#fff;padding:16px 18px;font:inherit;box-shadow:0 12px 30px rgba(15,23,42,.06)}.hrb-list{padding:64px 0;background:#fff}.hrb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.hrb-card{position:relative;overflow:hidden;border:1px solid var(--b-line);border-radius:28px;background:#fff;box-shadow:0 18px 42px rgba(15,23,42,.06);padding:24px;transition:.22s ease;min-height:320px;display:flex;flex-direction:column}.hrb-card:before{content:"";position:absolute;right:-40px;top:-50px;width:140px;height:140px;border-radius:38px;background:linear-gradient(135deg,rgba(37,99,235,.18),rgba(14,165,233,.16));transform:rotate(14deg)}.hrb-card:hover{transform:translateY(-6px);box-shadow:var(--b-shadow);border-color:#bfdbfe}.hrb-card-top{display:flex;justify-content:space-between;gap:10px;align-items:center;position:relative;z-index:1}.hrb-card-top span{padding:7px 10px;border-radius:999px;background:#eaf2ff;color:var(--b-blue);font-size:12px;font-weight:900}.hrb-card-top b{font-size:12px;color:#64748b}.hrb-card h2{position:relative;z-index:1;color:var(--b-navy);font-size:22px;line-height:1.18;letter-spacing:-.02em;margin:18px 0 10px}.hrb-card p{position:relative;z-index:1;color:#64748b;margin:0}.hrb-read{position:relative;z-index:1;margin-top:auto;color:var(--b-blue);font-weight:950;padding-top:18px}.hrb-progress{position:fixed;top:0;left:0;height:4px;background:linear-gradient(90deg,var(--b-blue),var(--b-pink));width:0;z-index:999}.hrb-article{padding:64px 0;background:linear-gradient(180deg,#f8fbff,#fff)}.hrb-article-grid{display:grid;grid-template-columns:240px minmax(0,820px);gap:44px;align-items:start}.hrb-toc{position:sticky;top:100px;border:1px solid var(--b-line);border-radius:24px;background:#fff;padding:18px;box-shadow:0 12px 30px rgba(15,23,42,.06)}.hrb-toc a{color:var(--b-blue);font-weight:900}.hrb-source{margin-top:18px;color:#64748b;font-size:14px}.hrb-article-main{border:1px solid var(--b-line);border-radius:34px;background:#fff;padding:42px;box-shadow:var(--b-shadow)}.hrb-article-main h1{margin:16px 0;color:var(--b-navy);font-size:clamp(36px,5.4vw,62px);line-height:1.03;letter-spacing:-.055em;text-wrap:balance}.hrb-meta{color:#64748b;font-weight:800}.hrb-summary{font-size:20px;color:#475569;border-left:4px solid var(--b-blue);padding-left:18px;margin:28px 0}.hrb-content h2{margin:36px 0 12px;color:var(--b-navy);font-size:32px;line-height:1.18}.hrb-content h3{margin:28px 0 8px;color:#0f172a;font-size:24px}.hrb-content p{margin:14px 0}.hrb-content li{margin:8px 0}.hrb-content ul{padding-left:24px}.hrb-article-cta{margin-top:42px;border-radius:28px;background:linear-gradient(135deg,var(--b-blue),#7c3aed);color:#fff;padding:28px}.hrb-article-cta h2{color:#fff;margin:0 0 8px}.hrb-article-cta p{color:#e0e7ff}.hrb-article-cta a{display:inline-flex;margin-top:10px;padding:12px 18px;border-radius:999px;background:#fff;color:var(--b-blue);font-weight:950}.hrb-float-zalo{position:fixed;right:18px;bottom:18px;z-index:60;width:58px;height:58px;border-radius:50%;display:grid;place-items:center;background:#2563eb;color:#fff!important;font-weight:950;box-shadow:0 18px 38px rgba(37,99,235,.34)}@media(max-width:980px){.hrb-grid{grid-template-columns:repeat(2,1fr)}.hrb-article-grid{grid-template-columns:1fr}.hrb-toc{position:relative;top:auto}.hrb-nav nav{display:none}}@media(max-width:720px){.hrb-container{width:min(100% - 24px,var(--b-max))}.hrb-hero{padding:58px 0}.hrb-hero h1{font-size:42px}.hrb-hero p{font-size:16px}.hrb-search-wrap{grid-template-columns:1fr}.hrb-grid{grid-template-columns:1fr}.hrb-article{padding:28px 0}.hrb-article-main{padding:24px;border-radius:28px}.hrb-article-main h1{font-size:34px}.hrb-summary{font-size:17px}.hrb-content h2{font-size:26px}.hrb-logo img{height:50px}.hrb-float-zalo{width:52px;height:52px}}


/* v3.8.4 CTA contrast hotfix */
.hrb-article-cta a,.hrb-article-cta a:visited,.hrb-article-cta a:hover,.hrb-article-cta a:focus{display:inline-flex!important;align-items:center!important;justify-content:center!important;min-height:46px!important;padding:12px 22px!important;border-radius:999px!important;background:#fff!important;color:#155eef!important;font-weight:950!important;text-shadow:none!important;text-decoration:none!important;box-shadow:0 14px 30px rgba(15,23,42,.16)!important;line-height:1.25!important;}
.hrb-nav-cta,.hrb-nav-cta:visited,.hrb-nav-cta:hover,.hrb-nav-cta:focus{background:#07122b!important;color:#fff!important;text-shadow:0 1px 1px rgba(0,0,0,.18)!important;}
@media(max-width:720px){.hrb-article-cta a{width:100%!important}}


/* v3.8.5: hard CTA text contrast fix */
.hrb-article-cta .hrb-article-cta-btn,
.hrb-article-cta .hrb-article-cta-btn:visited,
.hrb-article-cta .hrb-article-cta-btn:hover,
.hrb-article-cta .hrb-article-cta-btn:focus{
  display:inline-flex!important;align-items:center!important;justify-content:center!important;
  min-height:48px!important;padding:13px 24px!important;border-radius:999px!important;
  background:#fff!important;color:#155eef!important;font-weight:950!important;text-decoration:none!important;
  box-shadow:0 14px 30px rgba(15,23,42,.18)!important;text-shadow:none!important;opacity:1!important;visibility:visible!important;
}
.hrb-article-cta .hrb-article-cta-btn span{color:#155eef!important;opacity:1!important;visibility:visible!important;display:inline-block!important;font-size:16px!important;line-height:1.2!important;}
@media(max-width:720px){.hrb-article-cta .hrb-article-cta-btn{width:100%!important}}


/* v3.8.6 hard button contrast / disabled wallet */
.hrb-article-cta .hrb-article-cta-btn,.hrb-article-cta .hrb-article-cta-btn:visited,.hrb-article-cta .hrb-article-cta-btn:hover,.hrb-article-cta .hrb-article-cta-btn:focus{background:#07122b!important;color:#fff!important;text-shadow:0 1px 1px rgba(0,0,0,.22)!important;border:1px solid rgba(255,255,255,.22)!important;}
.springo-payment-option.is-disabled{opacity:.72!important;background:#f8fafc!important;cursor:not-allowed!important;}
.springo-payment-option.is-disabled input{cursor:not-allowed!important;}
.springo-checkout-primary,.springo-checkout-primary:visited,.springo-checkout-primary:hover,.springo-checkout-primary:focus,.springo-btn-primary,.springo-btn-primary:visited,.springo-btn-primary:hover,.springo-btn-primary:focus{background:#e11d48!important;color:#fff!important;text-shadow:0 1px 1px rgba(0,0,0,.22)!important;border:0!important;}
.springo-checkout-secondary,.springo-checkout-secondary:visited,.springo-checkout-secondary:hover,.springo-checkout-secondary:focus{background:#fff!important;color:#07122b!important;border:1px solid #cbd5e1!important;text-shadow:none!important;}


/* v5.1.5 content overflow/layout hardening */
.hrb-article-main,.hrb-content{min-width:0;overflow-wrap:anywhere;word-break:break-word;}
.hrb-content img,.hrb-content figure img{max-width:100%!important;height:auto!important;display:block;margin:18px auto;border-radius:12px;object-fit:contain;}
.hrb-content figure{max-width:100%!important;margin:18px auto;}
.hrb-content table{display:block;max-width:100%!important;overflow-x:auto;-webkit-overflow-scrolling:touch;width:auto!important;border-collapse:collapse;}
.hrb-content iframe,.hrb-content object,.hrb-content embed,.hrb-content video{max-width:100%!important;}
.hrb-content pre,.hrb-content code{white-space:pre-wrap;word-break:break-word;}
.hrb-content .spr-table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:16px 0;}
.hrb-content [style*="width"],.hrb-content [style*="height"]{max-width:100%!important;}

/* ===================================================================
   Sidebar bài viết nâng cấp (.hrb-toc): tìm kiếm nhanh, điều hướng,
   quick actions, bài viết nổi bật. Desktop: thu gọn được (rail icon).
   Mobile: off-canvas trượt từ trái, mở bằng nút hamburger trên header
   (thay thế menu chính vốn tự ẩn dưới 980px mà không có gì thay thế).
   =================================================================== */
.hrb-burger{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;border:1px solid var(--b-line);background:#fff;color:var(--b-navy);flex:0 0 auto;cursor:pointer}
.hrb-burger svg{width:19px;height:19px}
.hrb-toc{transition:width .25s cubic-bezier(.4,0,.2,1)}
.hrb-toc-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px}
.hrb-toc-collapse,.hrb-toc-close{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;border:1px solid var(--b-line);background:#fff;color:var(--b-muted);flex:0 0 auto;cursor:pointer}
.hrb-toc-collapse svg,.hrb-toc-close svg{width:14px;height:14px;transition:transform .25s ease}
.hrb-toc-close{display:none}
.hrb-side-search{position:relative;margin:0 0 16px}
.hrb-side-search input{width:100%;height:42px;border-radius:12px;border:1px solid var(--b-line);background:var(--b-bg);padding:0 14px 0 36px;font-size:13.5px;outline:none;box-sizing:border-box;font:inherit}
.hrb-side-search input:focus{border-color:var(--b-blue);background:#fff}
.hrb-side-search svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--b-muted);pointer-events:none}
.hrb-side-title{font-size:11px;font-weight:900;letter-spacing:.06em;text-transform:uppercase;color:#9aabc4;margin:16px 0 8px;padding:0 2px}
.hrb-side-nav{display:flex;flex-direction:column;gap:2px}
.hrb-side-nav a{display:flex;align-items:center;gap:10px;padding:9px 8px;border-radius:10px;font-size:13.8px;font-weight:800;color:#334155}
.hrb-side-nav a:hover{background:var(--b-bg);color:var(--b-blue)}
.hrb-side-nav a.is-active{background:linear-gradient(135deg,var(--b-blue),#7c3aed);color:#fff}
.hrb-side-qa{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:2px 0 4px}
.hrb-toc .hrb-side-qa-btn{display:flex;flex-direction:column;gap:6px;padding:10px;border-radius:12px;border:1px solid var(--b-line);background:#fff;text-decoration:none!important;transition:border-color .15s ease,transform .15s ease}
.hrb-toc .hrb-side-qa-btn:hover{border-color:var(--b-pink);color:inherit;transform:translateY(-1px)}
.hrb-side-qa-icon{width:26px;height:26px;border-radius:8px;background:#fdeef3;display:flex;align-items:center;justify-content:center;font-size:13px}
.hrb-side-qa-label{font-size:11.5px;font-weight:800;color:#0f172a;line-height:1.3}
.hrb-side-related{display:grid;gap:2px}
.hrb-toc a.hrb-side-related-a,.hrb-side-related a{display:block;padding:8px;border-radius:10px;text-decoration:none!important}
.hrb-side-related a:hover{background:var(--b-bg)}
.hrb-side-related-cat{display:block;font-size:10.5px;font-weight:900;text-transform:uppercase;color:var(--b-blue);margin-bottom:2px}
.hrb-side-related-title{display:block;font-size:12.8px;font-weight:700;color:#0f172a;line-height:1.4}
.hrb-back-all{display:block;margin-top:16px;color:var(--b-blue);font-weight:900}
/* Thu gọn (desktop) */
.hrb-toc.is-collapsed{width:76px;padding:18px 10px}
.hrb-toc.is-collapsed .hrb-side-label,
.hrb-toc.is-collapsed .hrb-side-search,
.hrb-toc.is-collapsed .hrb-side-title,
.hrb-toc.is-collapsed .hrb-side-qa-label,
.hrb-toc.is-collapsed .hrb-side-related,
.hrb-toc.is-collapsed .hrb-source{display:none!important}
.hrb-toc.is-collapsed .hrb-side-qa{grid-template-columns:1fr}
.hrb-toc.is-collapsed .hrb-side-nav a{justify-content:center}
.hrb-toc.is-collapsed .hrb-toc-collapse svg{transform:rotate(180deg)}
/* Off-canvas mobile + backdrop */
.hrb-side-backdrop{display:none;position:fixed;inset:0;background:rgba(7,18,43,.5);z-index:9998;opacity:0;transition:opacity .25s ease}
body.hrb-sidebar-open .hrb-side-backdrop{display:block;opacity:1}
body.hrb-sidebar-open{overflow:hidden}
.hrb-toc-offcanvas-only{display:none}
@media(max-width:980px){
  .hrb-nav nav{display:none}
  .hrb-burger{display:inline-flex}
  .hrb-toc,.hrb-toc-offcanvas-only{
    display:block;position:fixed!important;top:0;left:0;height:100vh;width:min(84vw,320px);max-width:320px;
    border-radius:0;transform:translateX(-100%);transition:transform .3s cubic-bezier(.4,0,.2,1);
    z-index:9999;overflow-y:auto;padding:20px;
  }
  body.hrb-sidebar-open .hrb-toc,body.hrb-sidebar-open .hrb-toc-offcanvas-only{transform:translateX(0);box-shadow:24px 0 48px rgba(7,18,43,.22)}
  .hrb-toc.is-collapsed{width:min(84vw,320px);padding:20px}
  .hrb-toc.is-collapsed .hrb-side-label,
  .hrb-toc.is-collapsed .hrb-side-search,
  .hrb-toc.is-collapsed .hrb-side-title,
  .hrb-toc.is-collapsed .hrb-side-qa-label,
  .hrb-toc.is-collapsed .hrb-side-related,
  .hrb-toc.is-collapsed .hrb-source{display:revert!important}
  .hrb-toc.is-collapsed .hrb-side-qa{grid-template-columns:1fr 1fr}
  .hrb-toc.is-collapsed .hrb-side-nav a{justify-content:flex-start}
  .hrb-toc-collapse{display:none}
  .hrb-toc-close{display:flex}
}
@media(prefers-reduced-motion:reduce){.hrb-toc,.hrb-side-backdrop{transition:none!important}}