/* CONTA blog article format: TOC column + creative article column, bk-* components */
.post-main.is-blog{--ink:#151515;--ink2:#3a3d3a;--mut:#6b706b;--paper:#f6f6f2;--card:#fff;--line:#e4e5e0;--g:#40A140;--g4:#73D473;--g1:#e9f6e9;--coral:#ff6b4a;--coral-d:#c2412a;--amber:#ffb020;
  background:radial-gradient(60% 40% at 100% 0%,rgba(64,161,64,.08),transparent 70%),var(--paper);color:var(--ink);padding-block:clamp(40px,5vw,80px) 0}
.post-main.is-blog::before,.post-main.is-blog::after{content:none}
.blog-grid{display:grid;grid-template-columns:290px minmax(0,1fr);gap:clamp(32px,4vw,72px);align-items:start;max-width:var(--track);margin-inline:auto}
.blog-main{min-width:0;max-width:900px}

/* sidebar */
.blog-side{position:sticky;top:24px;align-self:start}
body.admin-bar .blog-side{top:56px}
.blog-side-in{display:grid;gap:12px}
.blog-toc{background:#151515;color:#fff;border-radius:24px;padding:20px 14px 14px;box-shadow:0 30px 60px rgba(0,0,0,.12)}
.blog-toc-head{display:flex;justify-content:space-between;align-items:center;padding:0 8px 12px}
.blog-toc-head p{margin:0;font-weight:800;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--g4)}
.blog-time{font-size:12px;font-weight:600;color:#bdbdbd}
.blog-prog{height:4px;border-radius:2px;background:rgba(255,255,255,.12);margin:0 8px 10px;overflow:hidden}
.blog-prog i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--g),var(--g4));transform-origin:left;transform:scaleX(0);transition:transform .15s linear}
.blog-toc{display:flex;flex-direction:column}
.blog-toc .bt-wrap{position:relative;margin:0 -4px}
.blog-toc ol{list-style:none;margin:0;padding:2px 4px;display:grid;gap:0;position:relative;max-height:max(240px,calc(100vh - 430px));overflow-y:auto;overscroll-behavior:contain;scroll-behavior:smooth;scrollbar-width:none;-ms-overflow-style:none}
.blog-toc ol::-webkit-scrollbar{display:none;width:0;height:0}
.blog-toc ol::before{content:"";position:absolute;left:21px;top:16px;bottom:16px;width:2px;background:rgba(255,255,255,.1);border-radius:1px}
.blog-toc .bt-wrap::before,.blog-toc .bt-wrap::after{content:"";position:absolute;left:0;right:0;height:42px;z-index:2;pointer-events:none;opacity:0;transition:opacity .25s}
.blog-toc .bt-wrap::before{top:0;background:linear-gradient(#151515,rgba(21,21,21,0))}
.blog-toc .bt-wrap::after{bottom:0;background:linear-gradient(rgba(21,21,21,0),#151515)}
.blog-toc .bt-wrap.is-up::before,.blog-toc .bt-wrap.is-down::after{opacity:1}
.blog-toc li{position:relative}
.blog-toc a{display:grid;grid-template-columns:26px 1fr;gap:10px;align-items:start;padding:7px 8px 7px 4px;border-radius:12px;color:#bdbdbd;text-decoration:none;font-size:13px;line-height:1.4;font-weight:500;transition:background .25s,color .25s}
.blog-toc a span{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.blog-toc a.is-on span,.blog-toc a:hover span{-webkit-line-clamp:4}
.blog-toc a b{position:relative;z-index:1;justify-self:center;display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:#151515;border:2px solid #3a3a3a;font-size:10px;font-weight:800;color:#8a8a8a;transition:background .25s,border-color .25s,color .25s,box-shadow .25s}
.blog-toc a:hover{background:rgba(255,255,255,.05);color:#fff}
.blog-toc a.is-done b{background:var(--g);border-color:var(--g);color:#151515}
.blog-toc a.is-on{background:rgba(64,161,64,.16);color:#fff}
.blog-toc a.is-on b{background:#151515;border-color:var(--g4);color:var(--g4);box-shadow:0 0 0 4px rgba(115,212,115,.18)}
.blog-toc .bt-more{display:none;margin:6px 4px 0;padding:8px 10px;border:0;border-radius:10px;background:rgba(255,255,255,.06);color:#cfcfcf;font:inherit;font-size:12px;font-weight:700;cursor:pointer;text-align:center}
.blog-toc .bt-wrap.is-down + .bt-more,.blog-toc .bt-wrap.is-up + .bt-more{display:block}
.blog-toc .bt-more:hover{background:rgba(255,255,255,.1);color:#fff}
.blog-toc a:focus-visible{outline:2px solid var(--g4);outline-offset:1px}
.blog-side-ad{position:relative;overflow:hidden;border-radius:20px;padding:16px;grid-template-columns:1fr 1fr;background:linear-gradient(135deg,var(--g),#2d7a2d);color:#fff;display:grid;gap:8px}
.blog-side-ad::after{content:"";position:absolute;right:-40px;top:-40px;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.14)}
.bsa-k,.bsa-t{grid-column:1/-1}
.bsa-k{margin:0;font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;opacity:.85}
.bsa-t{margin:0;font-weight:800;font-size:16px;line-height:1.3}
.bsa-go,.bsa-zalo{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;padding:0 8px;white-space:nowrap;border-radius:999px;font-weight:700;font-size:13px;text-decoration:none;position:relative;z-index:1}
.bsa-go{background:#151515;color:#fff}.bsa-go .ico{width:16px;height:16px}
.bsa-zalo{background:#fff;color:#0068ff}
.blog-share{display:flex;align-items:center;gap:8px;padding:6px 6px 0;font-size:12px;font-weight:700;color:var(--mut)}
.blog-share a,.blog-share button{display:grid;place-items:center;height:36px;min-width:36px;padding:0 10px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink);font:inherit;font-size:12px;font-weight:700;cursor:pointer}
.blog-share svg{width:16px;height:16px}
.blog-share a:hover,.blog-share button:hover{border-color:var(--g)}

/* article column: reading typography */
.blog-entry{--fg:var(--ink);--muted:var(--ink2);--line:var(--line);--rule:var(--ink);--card:#fff;--card-line:var(--line);--inv:#fff;max-width:none;gap:26px;color:var(--ink)}
.blog-entry > p,.blog-entry li,.blog-entry .col p{font-size:17.5px;line-height:1.75;color:var(--ink2)}
.blog-entry > p{max-width:760px}
.blog-entry > p:first-child{font-weight:500;font-size:17.5px;line-height:1.75;color:var(--ink2)}
.blog-entry strong,.blog-entry b{color:var(--ink)}
.blog-entry a{color:#1f7a1f;text-decoration:underline;text-decoration-color:var(--g4);text-decoration-thickness:2px;text-underline-offset:4px;transition:background .2s}
.blog-entry a:hover{background:var(--g1)}
.blog-entry h2{display:block;position:relative;font-family:var(--font,inherit);font-weight:800;font-size:clamp(26px,2.6vw,36px);line-height:1.2;letter-spacing:-.01em;color:var(--ink);margin:44px 0 0;padding-top:58px;scroll-margin-top:24px;text-wrap:balance}
.blog-entry h2::after{content:none}
.blog-entry h2[data-n]::before{content:attr(data-n);position:absolute;left:0;top:0;display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:#151515;color:var(--g4);font-size:15px;font-weight:800;letter-spacing:.04em}
.blog-entry h2[data-n] + p{margin-top:-6px}
.blog-entry h2 .hl,.blog-entry .hl{background:linear-gradient(transparent 58%,rgba(115,212,115,.55) 58%);padding-inline:2px}
.blog-entry h3{font-weight:800;font-size:clamp(19px,1.6vw,22px);line-height:1.3;color:var(--ink);margin:12px 0 0}
.blog-entry ul,.blog-entry ol{padding-left:1.3em;display:grid;gap:8px}
.blog-entry ul li::marker{color:var(--g)}
.blog-entry ol li::marker{color:var(--g);font-weight:800}
.blog-entry blockquote{border-left:4px solid var(--g);padding:6px 0 6px 22px;font-size:20px;font-weight:600;color:var(--ink)}
.blog-entry img{border-radius:18px}
.blog-entry .faq{margin-top:28px;gap:0;border-radius:24px;background:#151515;padding:clamp(22px,3vw,40px)}
.blog-entry .faq h2{color:#fff;padding-top:0;margin:0 0 10px}
.blog-entry .faq h2::before{content:none}
.blog-entry .faq-item{border-top:1px solid rgba(255,255,255,.14);padding:18px 0}
.blog-entry .faq-item h3{color:#fff;font-size:18px;cursor:pointer;display:flex;justify-content:space-between;gap:16px}
.blog-entry .faq-item h3::after{content:"+";font-size:24px;line-height:1;color:var(--g4);transition:transform .3s}
.blog-entry .faq-item.is-open h3::after{transform:rotate(45deg)}
.blog-entry .faq-item p{color:#d0d0d0;font-size:16px}
.bk-js .blog-entry .faq-item:not(.is-open) > :not(h3){display:none}
.blog-entry .author-box{background:#fff;border:1px solid var(--line)}
.blog-entry .author-box p{color:var(--ink2)}.blog-entry .author-box b{color:var(--ink)}
.blog-entry .author-box .ab-date{color:var(--mut)}
.post-main.is-blog .post-foot{border-top-color:var(--line);color:var(--ink);max-width:none}
.post-main.is-blog .post-foot .ghost{color:var(--ink);border-color:var(--ink)}
.post-main.is-blog .collab,.post-main.is-blog .cb{margin-top:clamp(60px,7vw,110px)}

/* reveal */
.bk-js .bk-rv{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.bk-js .bk-rv.is-in{opacity:1;transform:none}

/* ---------- components ---------- */
.blog-entry .bk-lead{font-size:clamp(19px,1.7vw,22px)!important;line-height:1.6!important;font-weight:600!important;color:var(--ink)!important;max-width:820px}
.blog-entry .bk-lead::first-letter{float:left;font-family:var(--display,inherit);font-weight:900;font-size:4.2em;line-height:.82;margin:.06em .1em 0 0;color:var(--g)}
.bk-k{display:inline-flex;align-items:center;gap:10px;margin:0;font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--g)}
.bk-k::before{content:"";width:22px;height:2px;background:currentColor}

.bk-tldr{position:relative;overflow:hidden;border-radius:26px;padding:clamp(22px,3vw,36px);background:#151515;color:#fff;display:grid;gap:14px}
.bk-tldr::after{content:"";position:absolute;right:-80px;top:-80px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,rgba(64,161,64,.45),transparent 70%)}
.bk-tldr .bk-k{color:var(--g4)}
.bk-tldr ol{list-style:none;padding:0;margin:0;display:grid;gap:10px;counter-reset:t;position:relative;z-index:1}
.bk-tldr li{counter-increment:t;display:grid;grid-template-columns:34px 1fr;gap:12px;font-size:16px!important;line-height:1.55!important;color:#e6e6e6!important}
.bk-tldr li::before{content:counter(t);width:30px;height:30px;border-radius:50%;background:var(--g);color:#151515;display:grid;place-items:center;font-weight:800;font-size:13px}

.bk-callout{border-radius:20px;padding:20px 22px 20px 64px;position:relative;background:#fff;border:1px solid var(--line);font-size:16px;line-height:1.7;color:var(--ink2)}
.bk-callout::before{content:"i";position:absolute;left:20px;top:20px;width:30px;height:30px;border-radius:10px;display:grid;place-items:center;font-weight:900;background:var(--g1);color:#1f7a1f}
.bk-callout.is-tip{background:var(--g1);border-color:#c9e7c9}.bk-callout.is-tip::before{content:"✦";background:var(--g);color:#fff}
.bk-callout.is-warn{background:#fff6ee;border-color:#ffd8c2}.bk-callout.is-warn::before{content:"!";background:var(--coral);color:#fff}
.bk-callout.is-law{background:#151515;border-color:#151515;color:#d6d6d6}.bk-callout.is-law::before{content:"§";background:var(--amber);color:#151515}
.bk-callout.is-law b{color:#fff}
.bk-callout p{margin:0}.bk-callout p + p{margin-top:8px}

.bk-pull{margin:8px 0;padding:8px 0 8px 0;font-family:var(--display,inherit);font-weight:900;text-transform:uppercase;font-size:clamp(26px,3.2vw,42px);line-height:1.08;color:var(--ink);position:relative}
.bk-pull span{background:linear-gradient(transparent 60%,rgba(115,212,115,.6) 60%)}
.bk-pull cite{display:block;margin-top:12px;font-family:"Montserrat",system-ui,sans-serif;font-style:normal;text-transform:none;font-size:14px;line-height:1.6;font-weight:600;color:var(--mut);letter-spacing:0}

.bk-figure{margin:6px 0;border-radius:24px;overflow:hidden;background:#fff;border:1px solid var(--line)}
.bk-figure img{display:block;width:100%;height:auto;border-radius:0;transition:transform 1.2s cubic-bezier(.2,.7,.2,1)}
.bk-figure:hover img{transform:scale(1.02)}
.bk-figure figcaption{padding:14px 20px;margin:0!important;font-size:14px!important;line-height:1.6;color:var(--mut)!important;text-align:left!important;border-top:1px solid var(--line)}
.bk-js .bk-figure.bk-rv{clip-path:inset(0 0 100% 0 round 24px);opacity:1;transform:none;transition:clip-path 1.1s cubic-bezier(.2,.7,.2,1)}
.bk-js .bk-figure.bk-rv.is-in{clip-path:inset(0 0 0 0 round 24px)}

.bk-cards{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:14px}
.bk-cards > *{position:relative;border-radius:20px;padding:22px;background:#fff;border:1px solid var(--line);display:grid;gap:8px;align-content:start;transition:transform .35s,box-shadow .35s,border-color .35s}
.bk-cards > *:hover{transform:translateY(-4px);box-shadow:0 22px 40px rgba(0,0,0,.08);border-color:var(--g)}
.bk-cards .n{font-family:var(--display,inherit);font-weight:900;font-size:34px;line-height:1;color:var(--g)}
.bk-cards h3{margin:0!important;font-size:18px!important}
.bk-cards p{margin:0;font-size:15px!important;line-height:1.6!important;color:var(--ink2)}
.bk-cards .tag{justify-self:start;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:5px 10px;border-radius:999px;background:var(--g1);color:#1f7a1f}
.bk-cards .tag.is-bad{background:#ffe6dd;color:var(--coral-d)}
.bk-cards.is-dark > *{background:#151515;border-color:#151515;color:#fff}
.bk-cards.is-dark h3{color:#fff}.bk-cards.is-dark p{color:#cfcfcf}

.bk-stat{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:14px}
.bk-stat > div{border-radius:20px;padding:20px;background:#151515;color:#fff}
.bk-stat b{display:block;font-family:var(--display,inherit);font-weight:900;font-size:clamp(36px,4vw,56px);line-height:.95;color:var(--g4)}
.bk-stat span{display:block;margin-top:8px;font-size:14px;line-height:1.45;color:#d0d0d0}

.bk-compare{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.bk-compare > div{border-radius:22px;padding:22px;background:#fff;border:1px solid var(--line)}
.bk-compare h3{display:flex;align-items:center;gap:10px;margin:0 0 12px!important;font-size:17px!important}
.bk-compare h3::before{content:"✓";width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--g);color:#fff;font-size:14px}
.bk-compare > div.is-no{background:#fff6f2;border-color:#ffd8c2}
.bk-compare > div.is-no h3::before{content:"✕";background:var(--coral)}
.bk-compare ul{list-style:none;padding:0;margin:0;gap:10px}
.bk-compare li{font-size:15.5px!important;line-height:1.55!important;padding-left:18px;position:relative}
.bk-compare li::before{content:"";position:absolute;left:0;top:.65em;width:7px;height:7px;border-radius:50%;background:var(--g)}
.bk-compare .is-no li::before{background:var(--coral)}

.bk-table{overflow-x:auto;border-radius:22px;border:1px solid var(--line);background:#fff}
.bk-table table{width:100%;border-collapse:collapse;min-width:640px;font-size:15px;line-height:1.55}
.bk-table th,.bk-table td{padding:15px 18px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.bk-table thead th{background:#151515;color:#fff;font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.bk-table tbody th{color:var(--ink);font-weight:700;width:24%}
.bk-table td{color:var(--ink2)}
.bk-table tbody tr{transition:background .2s}.bk-table tbody tr:hover{background:#fafaf7}
.bk-table tbody tr:last-child th,.bk-table tbody tr:last-child td{border-bottom:0}
.bk-table tr.is-hl th,.bk-table tr.is-hl td{background:var(--g1)}

/* interactive shells */
.bk-box{border-radius:26px;padding:clamp(20px,3vw,34px);background:#fff;border:1px solid var(--line);box-shadow:0 26px 60px rgba(0,0,0,.06);display:grid;gap:16px}
.bk-box.is-dark{background:#151515;border-color:#151515;color:#fff}
.bk-box.is-dark .bk-h,.bk-box.is-dark h3{color:#fff}
.bk-box.is-dark p{color:#cfcfcf}
.bk-h{margin:0!important;font-weight:800;font-size:20px!important;line-height:1.3;color:var(--ink)}
.bk-hint{margin:0;font-size:14px!important;line-height:1.55!important;color:var(--mut)!important}
.bk-out{margin:0;padding:14px 16px;border-radius:14px;background:var(--g1);font-size:15.5px!important;line-height:1.6!important;color:var(--ink)!important}
.bk-out b{color:#1f6b1f}
.bk-out.is-bad{background:#fff1ec}.bk-out.is-bad b{color:var(--coral-d)}
.bk-box.is-dark .bk-out{background:rgba(64,161,64,.16);color:#fff!important}.bk-box.is-dark .bk-out b{color:var(--g4)}
.bk-seg{display:flex;flex-wrap:wrap;gap:6px;padding:6px;border-radius:999px;background:#f1f1ec;border:1px solid var(--line);justify-self:start}
.bk-seg button,.bk-tabs [role=tab]{min-height:42px;padding:9px 16px;border-radius:999px;border:0;background:none;font:inherit;font-weight:700;font-size:14px;color:var(--ink);cursor:pointer;transition:background .25s,color .25s}
.bk-seg button[aria-pressed=true],.bk-tabs [role=tab][aria-selected=true]{background:#151515;color:#fff}
.bk-box.is-dark .bk-seg{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.14)}
.bk-box.is-dark .bk-seg button,.bk-box.is-dark .bk-tabs [role=tab]{color:#e6e6e6}
.bk-box.is-dark .bk-seg button[aria-pressed=true],.bk-box.is-dark .bk-tabs [role=tab][aria-selected=true]{background:var(--g);color:#151515}
.post-main.is-blog button:focus-visible,.post-main.is-blog input:focus-visible{outline:2px solid var(--g);outline-offset:2px}

/* tabs */
.bk-tabs [role=tablist]{display:flex;flex-wrap:wrap;gap:6px;padding:6px;border-radius:999px;background:#f1f1ec;border:1px solid var(--line);justify-self:start}
.bk-tabs [role=tabpanel]{animation:cbIn .45s cubic-bezier(.2,.7,.2,1)}
.bk-tabs [role=tabpanel][hidden]{display:none}
@keyframes cbIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.bk-box.is-dark .bk-tabs [role=tablist]{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.14)}

/* steps */
.bk-steps ol{list-style:none;padding:0;margin:0;display:grid;gap:0}
.bk-js .bk-steps ol{display:block;position:relative;min-height:var(--h,200px)}
.bk-steps li{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:16px 0;border-top:1px solid var(--line)}
.bk-js .bk-steps li{border:0;padding:0}
.bk-js .bk-steps li:not(.is-on){display:none}
.bk-js .bk-steps li.is-on{animation:cbIn .45s cubic-bezier(.2,.7,.2,1)}
.bk-steps li > b{font-family:var(--display,inherit);font-weight:900;font-size:54px;line-height:.9;color:var(--g)}
.bk-steps li h3{margin:0 0 6px!important}
.bk-steps li p{margin:0;font-size:16.5px!important;line-height:1.7!important;color:var(--ink2)}
.bk-steps li .bk-when{display:inline-block;margin-top:10px;font-size:12px;font-weight:800;padding:6px 12px;border-radius:999px;background:#151515;color:#fff}
.bk-dots{display:none;align-items:center;gap:8px;flex-wrap:wrap}
.bk-js .bk-dots{display:flex}
.bk-dots button{min-width:40px;height:40px;border-radius:12px;border:1.5px solid var(--line);background:#fff;font:inherit;font-weight:800;font-size:13px;color:var(--mut);cursor:pointer;transition:.25s}
.bk-dots button.is-done{border-color:var(--g);color:var(--g)}
.bk-dots button[aria-current=step]{background:#151515;border-color:#151515;color:#fff}
.bk-dots .bk-nav{margin-left:auto;display:flex;gap:8px}
.bk-dots .bk-nav button{min-width:44px;height:44px;border-radius:50%;color:var(--ink);font-size:18px;border-color:#151515}
.bk-steps .bk-bar{height:4px;border-radius:2px;background:#ececec;overflow:hidden}
.bk-steps .bk-bar i{display:block;height:100%;background:var(--g);transition:width .4s}

/* checklist */
.bk-check label{display:grid;grid-template-columns:26px 1fr;gap:12px;align-items:start;padding:13px 15px;border-radius:14px;background:#fafaf7;border:1px solid var(--line);font-size:15.5px;line-height:1.5;color:var(--ink2);cursor:pointer;transition:.2s}
.bk-check label:hover{border-color:var(--g)}
.bk-check input{-webkit-appearance:none;appearance:none;width:22px;height:22px;margin:0;border:2px solid #b5b5b5;border-radius:7px;background:#fff;cursor:pointer;transition:.2s}
.bk-check input:checked{background:var(--g) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3.2 3L15 7' fill='none' stroke='%23fff' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat;border-color:var(--g)}
.bk-check label:has(input:checked){background:var(--g1);border-color:var(--g)}
.bk-check label:has(input:checked) span{color:var(--ink)}
.bk-check .bk-list{display:grid;gap:8px}
.bk-meter{height:10px;border-radius:5px;background:#ececec;overflow:hidden}
.bk-meter i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--g),var(--g4));transition:width .45s cubic-bezier(.2,.7,.2,1)}
.bk-box.is-dark .bk-meter{background:rgba(255,255,255,.12)}
.bk-box.is-dark .bk-check label,.bk-check.is-dark label{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.14);color:#e0e0e0}
.bk-box.is-dark .bk-check label:has(input:checked){background:rgba(64,161,64,.16)}
.bk-box.is-dark .bk-check input{background:transparent;border-color:#6b6b6b}

/* quiz & sort */
.bk-q{display:grid;gap:10px;padding:16px 0;border-top:1px solid var(--line)}
.bk-q:first-of-type{border-top:0;padding-top:0}
.bk-q > p{margin:0;font-weight:700;font-size:16.5px!important;color:var(--ink)!important}
.bk-opts{display:flex;flex-wrap:wrap;gap:8px}
.bk-opts button{min-height:44px;padding:10px 16px;border-radius:14px;border:1.5px solid #d6d6cf;background:#f4f4ef;font:inherit;font-weight:600;font-size:14.5px;color:var(--ink);cursor:pointer;text-align:left;transition:.2s}
.bk-opts button:hover{border-color:var(--ink)}
.bk-opts button.is-right{background:var(--g1);border-color:var(--g);color:#1f6b1f}
.bk-opts button.is-wrong{background:#fff1ec;border-color:var(--coral);color:var(--coral-d)}
.bk-why{margin:0;font-size:14.5px!important;line-height:1.6!important;color:var(--ink2)!important;padding-left:14px;border-left:3px solid var(--g)}
.bk-why[hidden]{display:none}
.bk-sort .bk-item{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;padding:14px 16px;border-radius:16px;background:#fafaf7;border:1px solid var(--line);transition:.3s}
.bk-sort .bk-item > span{font-weight:600;font-size:16px;color:var(--ink)}
.bk-sort .bk-item .bk-opts button{min-height:40px;padding:8px 14px;border-radius:999px}
.bk-sort .bk-item.is-right{background:var(--g1);border-color:var(--g)}
.bk-sort .bk-item.is-wrong{background:#fff1ec;border-color:var(--coral)}
.bk-sort .bk-item .bk-why{grid-column:1/-1}
.bk-score{display:flex;align-items:baseline;gap:8px;font-weight:700;color:var(--ink)}
.bk-score b{font-family:var(--display,inherit);font-size:34px;color:var(--g)}

/* flip cards */
.bk-flip{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:14px}
.bk-flip > button{position:relative;min-height:210px;border:0;padding:0;background:none;cursor:pointer;perspective:1000px;font:inherit;text-align:left}
.bk-flip .f,.bk-flip .b{position:absolute;inset:0;border-radius:20px;padding:20px;display:grid;align-content:space-between;gap:10px;backface-visibility:hidden;-webkit-backface-visibility:hidden;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.bk-flip .f{background:#151515;color:#fff}
.bk-flip .b{background:var(--g);color:#151515;transform:rotateY(180deg)}
.bk-flip > button[aria-pressed=true] .f{transform:rotateY(-180deg)}
.bk-flip > button[aria-pressed=true] .b{transform:rotateY(0)}
.bk-flip small{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;opacity:.75}
.bk-flip strong{font-size:17px;line-height:1.35;color:inherit}
.bk-flip .f strong{color:#fff}
.bk-flip .f em{font-style:normal;font-size:12px;font-weight:700;color:var(--g4)}
.bk-flip .b span{font-size:15px;line-height:1.55;font-weight:600}

/* range picker */
.bk-range input[type=range],.bk-utm input[type=range]{--v:50%;-webkit-appearance:none;appearance:none;width:100%;height:10px;border-radius:5px;background:linear-gradient(90deg,var(--g) var(--v),#e2e2dc var(--v));margin:6px 0;cursor:pointer}
.bk-range input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;border-radius:50%;background:#fff;border:7px solid var(--g);box-shadow:0 3px 10px rgba(0,0,0,.2)}
.bk-range input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:7px solid var(--g)}
.bk-range .bk-ticks{display:flex;justify-content:space-between;font-size:12px;font-weight:700;color:var(--mut)}
.bk-range .bk-card{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center;padding:18px;border-radius:18px;background:#151515;color:#fff;animation:cbIn .4s}
.bk-range .bk-card b{font-family:var(--display,inherit);font-weight:900;font-size:clamp(34px,4vw,52px);line-height:1;color:var(--g4);text-transform:uppercase}
.bk-range .bk-card strong{display:block;color:#fff;font-size:16px}
.bk-range .bk-card span{display:block;color:#cfcfcf;font-size:14.5px;line-height:1.55;margin-top:4px}

/* weigh: factors that push something up */
.bk-weigh .bk-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.bk-gauge{position:relative;height:18px;border-radius:9px;background:linear-gradient(90deg,#d9efd9,#ffe6a8 55%,#ffc7b6);overflow:hidden}
.bk-gauge i{position:absolute;top:-4px;bottom:-4px;width:6px;margin-left:-3px;border-radius:3px;background:#151515;left:var(--p,0%);transition:left .5s cubic-bezier(.2,.7,.2,1);box-shadow:0 0 0 3px #fff}
.bk-gauge-l{display:flex;justify-content:space-between;font-size:12px;font-weight:700;color:var(--mut)}

/* UTM builder */
.bk-utm .bk-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.bk-utm label{display:grid;gap:6px;font-weight:700;font-size:13px;color:var(--ink)}
.bk-box.is-dark.bk-utm label{color:#d6d6d6}
.bk-utm input[type=text],.bk-utm input[type=url],.bk-utm input[type=number]{min-height:44px;padding:10px 12px;border-radius:12px;border:1.5px solid var(--line);font:inherit;font-size:15px;background:#fff;color:var(--ink)}
.bk-utm input:focus{border-color:var(--g);outline:0;box-shadow:0 0 0 3px rgba(64,161,64,.18)}
.bk-utm output{display:block;padding:14px 16px;border-radius:14px;background:#151515;color:var(--g4);font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13.5px;line-height:1.55;word-break:break-all}
.bk-copy{justify-self:start;min-height:42px;padding:9px 18px;border-radius:999px;border:0;background:var(--g);color:#151515;font:inherit;font-weight:800;font-size:14px;cursor:pointer}

/* timeline */
.bk-time{list-style:none;padding:0!important;margin:0;display:grid;gap:0!important;position:relative}
.bk-time li{position:relative;padding:0 0 22px 40px;font-size:16px!important}
.bk-time li::before{content:"";position:absolute;left:9px;top:8px;bottom:-8px;width:2px;background:var(--line)}
.bk-time li:last-child::before{content:none}
.bk-time li::after{content:"";position:absolute;left:2px;top:4px;width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--g)}
.bk-time li b{display:block;color:var(--ink);font-size:15px;text-transform:uppercase;letter-spacing:.06em}

/* in-article service promo */
.bk-ad{position:relative;overflow:hidden;isolation:isolate;margin:22px 0 4px;border-radius:28px;padding:clamp(24px,3.4vw,40px);background:#0f120f;color:#fff;box-shadow:0 30px 70px rgba(0,0,0,.2)}
.bk-ad::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px) 0 0/34px 34px,linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px) 0 0/34px 34px}
.bk-ad-orb{position:absolute;z-index:-1;right:-90px;top:-110px;width:340px;height:340px;border-radius:50%;background:conic-gradient(from 0deg,var(--g),var(--g4),#1b5a1b,var(--g));filter:blur(40px);opacity:.55;animation:cbSpin 14s linear infinite}
.bk-ad.is-alt{background:var(--g);color:#151515}
.bk-ad.is-alt::before{background:linear-gradient(rgba(0,0,0,.05) 1px,transparent 1px) 0 0/34px 34px,linear-gradient(90deg,rgba(0,0,0,.05) 1px,transparent 1px) 0 0/34px 34px}
.bk-ad.is-alt .bk-ad-orb{background:conic-gradient(#fff,#b8f0b8,#fff);opacity:.45}
@keyframes cbSpin{to{transform:rotate(360deg)}}
.bk-ad-body{display:grid;gap:12px;max-width:620px}
.bk-ad p{margin:0;color:inherit!important}
.bk-ad-k{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px!important;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--g4)!important}
.bk-ad.is-alt .bk-ad-k{color:#151515!important}
.bk-ad-k span{padding:4px 10px;border-radius:999px;border:1px solid currentColor;letter-spacing:.08em;font-size:10.5px}
.bk-ad-t{font-family:var(--display,inherit);font-weight:900;text-transform:uppercase;font-size:clamp(26px,3vw,40px)!important;line-height:1.05!important}
.bk-ad-p{font-size:16px!important;line-height:1.6!important;opacity:.85}
.bk-ad-pts{list-style:none;padding:0!important;margin:0;display:flex!important;flex-wrap:wrap;gap:8px!important}
.bk-ad-pts li{padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);font-size:13px!important;font-weight:700;line-height:1.2!important;color:#fff!important}
.bk-ad.is-alt .bk-ad-pts li{background:rgba(0,0,0,.08);border-color:rgba(0,0,0,.16);color:#151515!important}
.bk-ad-btns{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:6px}
.bk-ad a{text-decoration:none!important;background:none}
.bk-ad .bk-ad-go{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 22px;border-radius:999px;background:var(--g);color:#151515!important;font-weight:800;font-size:15px;transition:transform .25s}
.bk-ad.is-alt .bk-ad-go{background:#151515;color:#fff!important}
.bk-ad .bk-ad-go .ico{width:18px;height:18px}
.bk-ad .bk-ad-go:hover{transform:translateX(3px)}
.bk-ad .bk-ad-zalo{display:inline-flex;align-items:center;min-height:48px;padding:0 20px;border-radius:999px;background:#fff;color:#0068ff!important;font-weight:800;font-size:15px}
.bk-ad .bk-ad-proof{color:inherit!important;font-weight:700;font-size:14px;text-decoration:underline!important;text-underline-offset:4px}

/* responsive */
@media (max-width:1180px){.blog-grid{grid-template-columns:250px minmax(0,1fr)}}
@media (min-width:1101px) and (max-height:820px){.blog-side-ad{display:none}.blog-toc ol{max-height:max(220px,calc(100vh - 230px))}}
@media (min-width:1101px) and (max-height:620px){.blog-share{display:none}.blog-toc ol{max-height:max(200px,calc(100vh - 170px))}}
@media (max-width:1100px){
  .blog-grid{grid-template-columns:minmax(0,1fr)}
  .blog-side{display:none}
  .blog-main{max-width:none}
}
@media (min-width:1101px){.has-blog-toc .toc-bar{display:none!important}}
@media (max-width:760px){
  .bk-cards,.bk-stat,.bk-flip{grid-template-columns:minmax(0,1fr)}
  .bk-compare,.bk-weigh .bk-list,.bk-utm .bk-fields{grid-template-columns:minmax(0,1fr)}
  .blog-entry > p,.blog-entry li{font-size:16.5px}
  .blog-entry h2{padding-top:54px;margin-top:32px}
  .bk-steps li{grid-template-columns:1fr;gap:6px}
  .bk-sort .bk-item{grid-template-columns:1fr}
  .bk-table::before{content:"Kéo ngang để xem đủ cột →";position:sticky;left:0;display:block;padding:10px 16px;font-size:12px;font-weight:700;color:var(--g)}
  .bk-range .bk-card{grid-template-columns:1fr}
  .bk-flip > button{min-height:180px}
  .bk-seg,.bk-tabs [role=tablist]{border-radius:18px}
}
@media (min-width:761px) and (max-width:1100px){.bk-cards{--cols:2}}
@media (prefers-reduced-motion:reduce){
  .bk-js .bk-rv,.bk-js .bk-figure.bk-rv{opacity:1;transform:none;clip-path:none;transition:none}
  .bk-ad-orb{animation:none}
  .bk-flip .f,.bk-flip .b{transition:none}
}

/* LTV : CAC calculator [data-bk-ltv] (reuses .bk-utm fields) */
.bk-ltv .bk-res{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.bk-ltv .bk-res div{padding:14px 16px;border-radius:14px;background:#151515;color:#fff}
.bk-box.is-dark.bk-ltv .bk-res div{background:#232823}
.bk-ltv .bk-res small{display:block;font-weight:700;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#a9b0a9}
.bk-ltv .bk-res b{display:block;margin-top:4px;font-family:"SVN-Neutraface 2",Montserrat,sans-serif;font-size:clamp(22px,3vw,30px);line-height:1.1;color:var(--g4)}
.bk-ltv .bk-res .is-bad b{color:#ff8a70}
@media (max-width:640px){.bk-ltv .bk-res{grid-template-columns:minmax(0,1fr)}}
/* range on dark boxes, long step labels */
.bk-box.is-dark.bk-range .bk-card{background:#232823}
.bk-box.is-dark.bk-range .bk-ticks{color:#a9b0a9}
.bk-range[data-mode=steps] .bk-card b{font-size:clamp(26px,3vw,40px);max-width:9ch}