/* BLOG — index (blog.html) and article pages (blog/*.html). Built by tools/build-blog.py */
.bcard__img picture,.bfeat__img picture,.pcover picture{display:contents}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.bsec{padding-top:clamp(44px,5vw,72px)}
.bhero{margin-bottom:clamp(30px,4vw,52px)}
.bmeta{display:flex;flex-wrap:wrap;align-items:center;gap:9px;font:500 11.5px/1.4 var(--f-mono);letter-spacing:.04em;color:var(--faint);margin:0}
.bmeta i{width:4px;height:4px;border-radius:50%;background:var(--seam-lit)}

/* featured */
.bfeat{position:relative;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:0;border:1px solid var(--seam);border-radius:var(--r);background:var(--graphite);overflow:hidden;text-decoration:none;transition:border-color .45s var(--ease),transform .45s var(--ease),box-shadow .45s var(--ease)}
.bfeat:hover{border-color:var(--seam-lit);transform:translateY(-3px);box-shadow:var(--edge),var(--lift)}
.bfeat__img{position:relative;min-height:320px;overflow:hidden}
.bfeat__img::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent 55%,rgba(21,24,22,.9))}
.bfeat__img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.bfeat:hover .bfeat__img img{transform:scale(1.04)}
.bfeat__body{display:flex;flex-direction:column;justify-content:center;gap:16px;padding:clamp(24px,3.2vw,48px)}
.bfeat__body h2{font:600 clamp(24px,2.6vw,34px)/1.18 var(--f-display);letter-spacing:-.015em;color:var(--bone)}
.bfeat__body>p:not(.label):not(.bmeta){font:400 16.5px/1.65 var(--f-body);color:var(--muted)}

/* search + topic chips */
.btools{display:flex;flex-wrap:wrap;gap:14px 20px;align-items:center;margin-top:clamp(36px,4.5vw,60px);padding-top:clamp(22px,2.6vw,30px);border-top:1px solid var(--seam)}
.bsearch{display:flex;align-items:center;gap:10px;flex:0 1 300px;min-width:min(100%,220px);padding:0 16px;height:46px;border:1px solid var(--seam);border-radius:var(--r-pill);background:var(--graphite);color:var(--muted);transition:border-color .3s var(--ease)}
.bsearch:focus-within{border-color:var(--volt-brd);color:var(--volt)}
.bsearch input{flex:1;min-width:0;background:none;border:0;outline:0;color:var(--bone);font:400 15px/1 var(--f-body)}
.bsearch input::placeholder{color:var(--faint)}
.bchips{display:flex;flex-wrap:wrap;gap:8px}
.bchipbtn{font:500 13px/1 var(--f-body);color:var(--text);background:transparent;border:1px solid var(--seam);border-radius:var(--r-pill);padding:11px 15px;cursor:pointer;transition:border-color .25s var(--ease),background .25s var(--ease),color .25s var(--ease)}
.bchipbtn span{font:500 11px/1 var(--f-mono);color:var(--faint);margin-left:5px}
.bchipbtn:hover{border-color:var(--seam-lit);background:var(--graphite)}
.bchipbtn.is-on{border-color:var(--volt-brd);background:var(--volt-dim);color:var(--volt)}
.bchipbtn.is-on span{color:var(--volt)}
.bchipbtn:focus-visible,.bsearch input:focus-visible{outline:2px solid var(--volt);outline-offset:3px}
.bcount{margin-top:clamp(20px,2.4vw,28px)}
.bempty{margin-top:28px;font:400 16px/1.6 var(--f-body);color:var(--muted)}

/* card grid */
.bgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:clamp(18px,2.2vw,26px);margin-top:clamp(16px,2vw,24px)}
.bcard{position:relative;display:flex;flex-direction:column;border:1px solid var(--seam);border-radius:var(--r);background:var(--graphite);overflow:hidden;transition:border-color .45s var(--ease),transform .45s var(--ease),box-shadow .45s var(--ease)}
.bcard:hover{border-color:var(--seam-lit);transform:translateY(-3px);box-shadow:var(--edge),var(--lift)}
.bcard[hidden]{display:none}
.bcard__img{position:relative;aspect-ratio:16/9;overflow:hidden;background:linear-gradient(135deg,var(--graphite),var(--machined))}
.bcard__img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,14,13,.05) 45%,rgba(12,14,13,.55))}
.bcard__img img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .8s var(--ease)}
.bcard:hover .bcard__img img{transform:scale(1.05)}
.bchip{position:absolute;z-index:1;left:14px;top:14px;font:500 10.5px/1 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--bone);background:rgba(12,14,13,.68);border:1px solid rgba(244,246,242,.14);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:8px 11px;border-radius:var(--r-pill)}
.bcard__body{display:flex;flex-direction:column;gap:11px;padding:22px 24px 24px;flex:1}
.bcard__body h3{font:600 19px/1.32 var(--f-display);color:var(--bone);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.bcard__body h3 a{text-decoration:none;color:inherit}
.bcard__body h3 a::after{content:"";position:absolute;inset:0}
.bcard__desc{font:400 15px/1.65 var(--f-body);color:var(--muted);flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.bcard__go{display:inline-flex;align-items:center;gap:9px;font:600 14.5px/1 var(--f-body);color:var(--volt);margin-top:4px}
.bcard__go .arw,.bfeat .arw{transition:transform .2s ease}
.bcard:hover .arw,.bfeat:hover .arw{transform:translateX(4px)}

/* article */
.psec{padding-top:clamp(36px,4.5vw,64px)}
.pwrap{max-width:1180px}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:9px;font:500 12px/1.4 var(--f-mono);letter-spacing:.06em;color:var(--faint);margin-bottom:clamp(22px,3vw,34px)}
.crumbs a{color:var(--muted);text-decoration:none;transition:color .2s}
.crumbs a:hover{color:var(--volt)}
.crumbs [aria-current]{color:var(--faint);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:min(46ch,100%)}
.phead{display:flex;flex-direction:column;gap:20px;max-width:860px}
.phead h1{font:600 clamp(32px,4.4vw,56px)/1.08 var(--f-display);letter-spacing:-.022em;color:var(--bone)}
.pmeta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;margin-top:6px;padding-top:22px;border-top:1px solid var(--seam)}
.pmeta__who{display:flex;align-items:center;gap:12px;text-decoration:none}
.pmeta__who img,.pauthor img{border-radius:50%;object-fit:cover;object-position:center 20%;border:1px solid var(--seam-lit)}
.pmeta__who img{width:44px;height:44px}
.pmeta__who span{display:flex;flex-direction:column;gap:3px}
.pmeta__who strong{font:600 15px/1.2 var(--f-body);color:var(--bone)}
.pmeta__who em{font:400 13px/1.2 var(--f-body);color:var(--muted);font-style:normal}
.pmeta__dates{display:flex;flex-wrap:wrap;align-items:center;gap:9px;font:500 12px/1.4 var(--f-mono);letter-spacing:.04em;color:var(--faint);margin:0}
.pmeta__dates i{width:4px;height:4px;border-radius:50%;background:var(--seam-lit)}
.pcover{margin:clamp(28px,3.4vw,44px) 0 0;border:1px solid var(--seam);border-radius:var(--r);overflow:hidden;background:var(--graphite);box-shadow:var(--edge),var(--lift)}
.pcover img{display:block;width:100%;height:auto;aspect-ratio:21/9;object-fit:cover}
.pgrid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:clamp(36px,5vw,72px);align-items:start;margin-top:clamp(36px,4.5vw,60px)}
.pbody{max-width:72ch}
.pbody>*+*{margin-top:20px}
.pbody p{font:400 17.5px/1.78 var(--f-body);color:var(--text)}
.pbody p.lead{font:300 clamp(19px,1.6vw,22px)/1.65 var(--f-body);color:var(--bone)}
.pbody .label{font:500 12px/1.4 var(--f-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.pbody .label--volt{color:var(--volt)}
.pbody strong{color:var(--bone);font-weight:600}
.pbody a{color:var(--volt);text-decoration:underline;text-decoration-color:var(--volt-brd);text-underline-offset:3px;transition:text-decoration-color .2s}
.pbody a:hover{text-decoration-color:var(--volt)}
.pbody h2{font:600 clamp(23px,2.2vw,28px)/1.25 var(--f-display);letter-spacing:-.012em;color:var(--bone);margin-top:clamp(40px,5vw,60px);padding-top:clamp(28px,3.4vw,40px);border-top:1px solid var(--seam);scroll-margin-top:calc(var(--bar) + 24px)}
.pbody ul,.pbody ol{margin-left:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:14px}
.pbody ol{counter-reset:pl}
.pbody li{position:relative;padding-left:34px;font:400 17px/1.7 var(--f-body);color:var(--text)}
.pbody ul li::before{content:"";position:absolute;left:4px;top:14px;width:12px;height:2px;border-radius:2px;background:var(--volt)}
.pbody ol li{counter-increment:pl}
.pbody ol li::before{content:counter(pl);position:absolute;left:0;top:3px;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font:500 12px/1 var(--f-mono);color:var(--volt);background:var(--volt-dim);border:1px solid var(--volt-brd)}

.pfaq{display:flex;flex-direction:column;gap:10px;margin-top:22px!important}
.pfaq details{border:1px solid var(--seam);border-radius:var(--r-sm);background:var(--graphite);transition:border-color .3s var(--ease)}
.pfaq details[open]{border-color:var(--seam-lit)}
.pfaq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:18px;padding:18px 20px;font:600 16.5px/1.45 var(--f-display);color:var(--bone)}
.pfaq summary::-webkit-details-marker{display:none}
.pfaq summary::after{content:"+";flex:none;font:400 24px/1 var(--f-body);color:var(--volt);transition:transform .25s var(--ease)}
.pfaq details[open] summary::after{transform:rotate(45deg)}
.pfaq summary:focus-visible{outline:2px solid var(--volt);outline-offset:2px;border-radius:var(--r-sm)}
.pfaq details p{padding:0 20px 20px;font:400 16px/1.7 var(--f-body);color:var(--muted)}
.pbody .pfaq details p{margin-top:0}

.pcta{margin-top:clamp(40px,5vw,60px)!important;position:relative;overflow:hidden;border:1px solid var(--volt-brd);border-radius:var(--r);background:radial-gradient(120% 140% at 100% 0,var(--volt-dim),transparent 60%),var(--graphite);padding:clamp(24px,3vw,34px);display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.pbody .pcta p:not(.label){font:400 17px/1.65 var(--f-body);color:var(--text)}
.pbody .pcta .btn{text-decoration:none;color:var(--on-volt)}
.pauthor{display:flex;align-items:center;gap:18px;margin-top:clamp(28px,3.4vw,40px)!important;padding:22px 0 0;border-top:1px solid var(--seam)}
.pauthor img{width:64px;height:64px;flex:none}
.pbody .pauthor p{font:400 15px/1.5 var(--f-body)}
.pbody .pauthor a{text-decoration:none}
.pauthor__n{color:var(--bone)!important;font:600 17px/1.4 var(--f-display)!important;margin-top:4px}
.pauthor .cs__go::after{display:none}

.pside{position:sticky;top:calc(var(--bar) + 24px);display:flex;flex-direction:column;gap:20px}
.ptoc{border:1px solid var(--seam);border-radius:var(--r);background:var(--graphite);padding:22px 22px 18px}
.ptoc ol{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;border-left:1px solid var(--seam)}
.ptoc a{display:block;padding:8px 0 8px 16px;margin-left:-1px;border-left:2px solid transparent;font:400 14px/1.45 var(--f-body);color:var(--muted);text-decoration:none;transition:color .2s,border-color .2s}
.ptoc a:hover{color:var(--bone)}
.ptoc a.is-on{color:var(--volt);border-left-color:var(--volt)}
.pscan{border:1px solid var(--volt-brd);border-radius:var(--r);background:var(--graphite);padding:22px;display:flex;flex-direction:column;gap:12px}
.prel{margin-top:clamp(64px,8vw,110px);padding-top:clamp(36px,4.4vw,56px);border-top:1px solid var(--seam)}
.prel__head{display:flex;flex-direction:column;gap:10px}

.pprog{position:fixed;left:0;top:0;height:3px;width:100%;z-index:150;background:var(--volt);transform:scaleX(0);transform-origin:0 50%;pointer-events:none}

@media (max-width:1020px){
  .pgrid{grid-template-columns:minmax(0,1fr)}
  .pside{display:none}
  .bfeat{grid-template-columns:minmax(0,1fr)}
  .bfeat__img{min-height:0;aspect-ratio:16/9}
  .bfeat__img::after{background:linear-gradient(180deg,transparent 55%,rgba(21,24,22,.9))}
}
@media (max-width:600px){
  .pcover img{aspect-ratio:16/9}
  .pauthor{align-items:flex-start}
  .bsearch{flex-basis:100%}
}
@media (prefers-reduced-motion:reduce){
  .bcard,.bfeat,.bcard__img img,.bfeat__img img{transition:none}
  .bcard:hover,.bfeat:hover{transform:none}
  .bcard:hover .bcard__img img,.bfeat:hover .bfeat__img img{transform:none}
}

/* tables inside articles (ACoS vs TACoS, agency pricing models, channel chooser) */
.ptable{overflow-x:auto;border:1px solid var(--seam);border-radius:var(--r-sm);background:var(--graphite)}
.ptable table{width:100%;border-collapse:collapse;min-width:520px}
.ptable th,.ptable td{text-align:left;vertical-align:top;padding:14px 18px;font:400 15.5px/1.55 var(--f-body);color:var(--text);border-bottom:1px solid var(--seam)}
.ptable th{font:500 11.5px/1.4 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--volt);background:var(--machined)}
.ptable tr:last-child td{border-bottom:0}
.ptable td:first-child{color:var(--bone);font-weight:600}