/* =========================================
   COSMO CLINIC ISRAEL — Blog index (2026 redesign)
   Builds on home.css, skin.css and treatments-page.css (tp-filter, tp-help).
   ========================================= */

/* ===== Hero: intro + the cryo guide as a photo card ===== */
.bi-hero{position:relative;background:var(--ink);color:var(--paper);overflow:hidden}
.bi-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(700px 360px at 85% -10%,rgba(247,177,147,.2),transparent 70%),radial-gradient(600px 300px at 5% 100%,rgba(242,140,106,.12),transparent 70%);pointer-events:none}
.bi-hero__in{position:relative;display:grid;gap:28px;padding-block:clamp(24px,5vw,64px) clamp(48px,7vw,88px)}
.bi-hero__text{display:flex;flex-direction:column;gap:14px}
.bi-hero__title{margin:0;font-family:var(--font-display);font-weight:400;font-size:clamp(40px,5.6vw,74px);line-height:1.05;color:var(--paper);text-wrap:balance}
.bi-hero__lead{margin:0;color:var(--muted-dark);font-weight:300;font-size:clamp(16px,1.4vw,19px);line-height:1.7;max-width:46ch}
.bi-hero__facts{list-style:none;margin:8px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.bi-hero__facts li{font-size:14px;padding:7px 14px;border-radius:999px;border:1px solid rgba(245,241,234,.18);background:rgba(245,241,234,.06)}
.bi-hero__facts b{color:var(--peach);font-weight:600}

.bi-feature{position:relative;display:block;aspect-ratio:4/4.4;border-radius:22px;overflow:hidden;color:var(--paper);text-decoration:none;background:#2A2420;box-shadow:0 30px 70px rgba(0,0,0,.4);isolation:isolate}
.bi-feature__img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 30%;transition:transform .8s ease}
.bi-feature:hover .bi-feature__img{transform:scale(1.04)}
.bi-feature__shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,18,16,.1) 0%,rgba(20,18,16,.25) 30%,rgba(20,18,16,.9) 58%,rgba(20,18,16,.96) 100%)}
.bi-feature__body{position:absolute;inset:auto 0 0 0;padding:22px;display:flex;flex-direction:column;gap:10px}
.bi-feature__tag{font-size:13px;font-weight:600;color:var(--peach)}
.bi-feature__title{font-family:var(--font-display);font-size:clamp(30px,3.4vw,42px);line-height:1.05}
.bi-feature__desc{font-size:15px;line-height:1.6;color:var(--muted-dark);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.bi-feature__cta{align-self:flex-start;margin-top:4px;padding:12px 22px;font-size:15px;gap:8px}

/* ===== Topic filter: sticky under the floating header ===== */
.bi-topics{position:sticky;top:calc(max(8px,env(safe-area-inset-top,0px)) + 66px);z-index:40;padding-block:10px;background:rgba(244,241,237,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.bi-topics__in{display:flex;width:fit-content;max-width:100%;overflow-x:auto;scrollbar-width:none;border-radius:999px;background:var(--peach-soft)}
.bi-topics__in::-webkit-scrollbar{display:none}
.bi-topics__in .tp-filter__btn{flex:none;min-height:40px;padding:8px 14px}
.bi-topics__n{display:inline-block;margin-inline-start:2px;font-size:12px;font-weight:600;opacity:.6}

/* ===== Topic sections ===== */
.bi-cluster{padding-block:clamp(44px,6vw,88px);border-bottom:1px solid var(--line)}
.bi-cluster[hidden]{display:none}
.bi-cluster:nth-of-type(even){background:var(--white)}
.bi-cluster__in{display:grid;gap:22px}
.bi-cluster__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}
.bi-cluster__num{font-size:13px;font-weight:600;color:var(--terracotta)}
.bi-cluster__title{margin:0;font-family:'Bellefair',serif!important;font-weight:400;font-size:clamp(32px,4vw,50px);line-height:1.1;flex-basis:100%}
.bi-cluster__count{font-size:14px;color:var(--muted)}
.bi-cluster__link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-warm);padding-bottom:2px}
.bi-cluster__link:hover{border-color:var(--ink)}

.bi-grid{display:grid;grid-template-columns:1fr;gap:12px}
.bi-card{display:flex;flex-direction:column;gap:8px;padding:22px;background:var(--white);border:1px solid var(--line);border-radius:18px;color:var(--ink);text-decoration:none;transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}
.bi-cluster:nth-of-type(even) .bi-card{background:var(--paper)}
.bi-card:hover{border-color:var(--line-warm);box-shadow:0 14px 34px rgba(29,25,21,.08);transform:translateY(-2px)}
.bi-card__tag{align-self:flex-start;font-size:12px;font-weight:600;color:var(--terracotta);background:var(--peach-soft);padding:4px 10px;border-radius:999px}
.bi-card__title{font-family:'Bellefair',serif;font-size:24px;line-height:1.2}
.bi-card__desc{font-size:15px;line-height:1.65;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.bi-card__foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:8px}
.bi-card__read{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted)}
.bi-card__go{width:40px;height:40px;border-radius:50%;border:1px solid var(--ink);display:flex;align-items:center;justify-content:center;transition:background .2s ease,color .2s ease}
.bi-card:hover .bi-card__go{background:var(--ink);color:var(--paper)}

/* The topic's main guide: dark and wider */
.bi-card--lead,.bi-cluster:nth-of-type(even) .bi-card--lead{background:radial-gradient(500px 240px at 90% 0%,rgba(247,177,147,.22),transparent 70%),var(--ink);border-color:var(--ink);color:var(--paper)}
.bi-card--lead .bi-card__tag{background:rgba(247,177,147,.16);color:var(--peach)}
.bi-card--lead .bi-card__title{font-size:clamp(28px,3vw,36px)}
.bi-card--lead .bi-card__desc,.bi-card--lead .bi-card__read{color:var(--muted-dark)}
.bi-card--lead .bi-card__go{border-color:var(--paper)}
.bi-card--lead:hover .bi-card__go{background:var(--paper);color:var(--ink)}

@media (max-width:639px){
  .bi-card{padding:18px;gap:6px}
  .bi-card__title{font-size:22px}
  .bi-card:not(.bi-card--lead) .bi-card__desc{-webkit-line-clamp:2}
  .bi-card__go{width:36px;height:36px}
}
@media (min-width:640px){
  .bi-grid{grid-template-columns:1fr 1fr;gap:14px}
  .bi-card--lead{grid-column:1/-1}
  /* an odd card left alone after the lead guide takes the full row */
  .bi-card--lead~.bi-card:last-child:nth-child(even){grid-column:1/-1;min-height:0}
}
@media (min-width:1000px){
  .bi-hero__in{grid-template-columns:minmax(0,1fr) 440px;align-items:center;gap:56px}
  .bi-feature{aspect-ratio:4/4.6}
  .bi-feature__body{padding:28px}
  .bi-topics{top:84px}
  .bi-cluster__in{grid-template-columns:260px minmax(0,1fr);gap:48px;align-items:start}
  .bi-cluster__head{position:sticky;top:156px;flex-direction:column;align-items:flex-start;gap:10px}
  .bi-cluster__title{flex-basis:auto}
  .bi-card{min-height:230px}
}