/* ============================================================
   Раздел «Полезное» — список статей.
   Цвета и шрифты наследуются от основного стиля сайта.
   Отступы по краям даёт .container шаблона, здесь их не задаём.
   ============================================================ */
.poleznoe{
  --pz-brand:#3d62eb;
  --pz-accent:#f81255;
  --pz-ink:#2e2e2e;
  --pz-muted:#7a8593;
  --pz-line:#e3e7ec;
  --pz-line-soft:#eef1f5;
  --pz-tint:#f3f7ff;
  --pz-brand-line:#d8dffb;
  --pz-surface:#fff;
  --pz-lift:0 2px 4px rgba(46,46,46,.05),0 18px 40px rgba(61,98,235,.14);
}

/* ---------- шапка раздела ---------- */
.poleznoe-hero{position:relative;overflow:hidden;background:#eef3ff;border-bottom:1px solid #e3e7ec}
.poleznoe-hero__layer{position:absolute;inset:0;pointer-events:none}
.poleznoe-hero__layer--far{filter:blur(8px);transform:translate3d(0,calc(var(--pz-sy,0)*.10px),0) scale(1.06)}
.poleznoe-hero__layer--far i{position:absolute;left:-8%;top:-30%;width:52%;height:150%;
  background:radial-gradient(60% 60% at 50% 50%,rgba(61,98,235,.16),transparent 70%)}
.poleznoe-hero__layer--net{filter:blur(4px);opacity:.55;transform:translate3d(0,calc(var(--pz-sy,0)*.25px),0)}
.poleznoe-hero__layer--net i{position:absolute;inset:0;
  background-image:linear-gradient(#d8dffb 1px,transparent 1px),linear-gradient(90deg,#d8dffb 1px,transparent 1px);
  background-size:88px 88px;opacity:.3;
  -webkit-mask-image:radial-gradient(75% 62% at 50% 40%,#000,transparent 78%);
          mask-image:radial-gradient(75% 62% at 50% 40%,#000,transparent 78%)}
.poleznoe-hero__layer--frames{transform:translate3d(0,calc(var(--pz-sy,0)*.5px),0)}
.poleznoe-hero__frame{position:absolute;border:2px solid #3d62eb;border-radius:4px;opacity:.16}
.poleznoe-hero__frame::after{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;
  background:#3d62eb;opacity:.75;transform:translateX(-50%)}
.poleznoe-hero__frame--1{width:132px;height:172px;right:6%;top:16%;animation:pzFloat 15s ease-in-out infinite}
.poleznoe-hero__frame--2{width:88px;height:112px;right:19%;top:52%;animation:pzFloat 17s ease-in-out infinite reverse}
.poleznoe-hero__frame--3{width:104px;height:74px;left:4%;top:56%;animation:pzFloat 13s ease-in-out infinite}
@keyframes pzFloat{0%,100%{transform:translate3d(0,0,0) rotate(0)}50%{transform:translate3d(0,-16px,0) rotate(1.2deg)}}

.poleznoe-hero__body{position:relative;z-index:2;padding-block:30px 34px}
.poleznoe-hero__title{margin:8px 0 12px;line-height:1.08;letter-spacing:-.025em;color:#2e2e2e}
.poleznoe-hero__mask{overflow:hidden;display:block}
.poleznoe-hero__mask > span{display:block;transform:translateY(105%);opacity:0;animation:pzUp .78s cubic-bezier(.16,1,.3,1) forwards}
.poleznoe-hero__mask:nth-of-type(2) > span{animation-delay:.1s}
@keyframes pzUp{to{transform:translateY(0);opacity:1}}
.poleznoe-hero__lead{margin:0;max-width:60ch;color:#7a8593;font-size:15.5px;
  opacity:0;transform:translateY(14px);animation:pzFade .7s cubic-bezier(.16,1,.3,1) .3s forwards}
.poleznoe-hero__stats{display:flex;gap:22px;flex-wrap:wrap;margin-top:18px;
  opacity:0;transform:translateY(14px);animation:pzFade .7s cubic-bezier(.16,1,.3,1) .4s forwards}
@keyframes pzFade{to{opacity:1;transform:translateY(0)}}
.poleznoe-stat b{display:block;font-size:22px;font-weight:700;color:#3d62eb;line-height:1.1}
.poleznoe-stat span{font-size:12.5px;color:#7a8593}

/* ---------- панель управления ---------- */
.poleznoe__controls{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;padding:22px 0 0}
.poleznoe__tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.poleznoe-sorts{display:flex;gap:4px;background:var(--pz-line-soft);padding:4px;border-radius:30px}
/* Сортировка — ссылки, а не кнопки: отбор серверный и работает с
   постраничностью. Вид тот же, что был у кнопок. */
.poleznoe-sorts__item{font:600 13px/1 inherit;padding:9px 16px;border-radius:30px;border:0;
  background:transparent;color:var(--pz-muted);cursor:pointer;transition:.18s;
  text-decoration:none;display:inline-flex;align-items:center;white-space:nowrap}
.poleznoe-sorts__item:hover{color:var(--pz-brand)}
.poleznoe-sorts__item[aria-pressed="true"]{background:#fff;color:var(--pz-brand);box-shadow:0 1px 3px rgba(46,46,46,.09)}
.poleznoe-search{position:relative}
.poleznoe-search input{font:400 14px/1.4 inherit;padding:10px 14px 10px 36px;border:1px solid var(--pz-line);
  border-radius:10px;background:#fff;color:inherit;width:230px}
.poleznoe-search input:focus{outline:2px solid var(--pz-brand);border-color:var(--pz-brand)}
.poleznoe-search svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);opacity:.45}
.poleznoe-search input[type="search"]::-webkit-search-cancel-button{display:none}
.poleznoe-search__clear{position:absolute;right:10px;top:50%;transform:translateY(-50%);
  width:20px;height:20px;border-radius:50%;display:grid;place-items:center;
  font-size:15px;line-height:1;color:var(--pz-muted);text-decoration:none;transition:.15s}
.poleznoe-search__clear:hover{background:var(--pz-line-soft);color:var(--pz-brand)}
.poleznoe-views{display:flex;gap:2px;background:var(--pz-line-soft);padding:4px;border-radius:10px}
.poleznoe-views__item{width:38px;height:34px;border:0;border-radius:7px;background:transparent;
  color:var(--pz-muted);cursor:pointer;display:grid;place-items:center;transition:.18s;position:relative}
.poleznoe-views__item:hover{color:var(--pz-brand)}
.poleznoe-views__item[aria-pressed="true"]{background:#fff;color:var(--pz-brand);box-shadow:0 1px 3px rgba(46,46,46,.09)}
.poleznoe-views__item::after{content:attr(data-tip);position:absolute;top:calc(100% + 8px);left:50%;
  transform:translateX(-50%) translateY(-4px);background:var(--pz-ink);color:#fff;font-size:11.5px;
  white-space:nowrap;padding:5px 9px;border-radius:6px;opacity:0;pointer-events:none;transition:.16s;z-index:20}
.poleznoe-views__item:hover::after{opacity:.94;transform:translateX(-50%) translateY(0)}

/* ---------- рубрики ---------- */
.poleznoe-chips{display:flex;gap:8px;flex-wrap:wrap;padding:18px 0 24px}
.poleznoe-chips__item{font:500 13px/1 inherit;padding:9px 15px;border-radius:30px;border:1px solid var(--pz-line);
  background:#fff;color:inherit;white-space:nowrap;transition:.18s;text-decoration:none;display:inline-flex;align-items:center}
.poleznoe-chips__item:hover{border-color:var(--pz-brand-line);color:var(--pz-brand);transform:translateY(-1px)}
.poleznoe-chips__item[aria-pressed="true"]{background:var(--pz-tint);border-color:var(--pz-brand-line);
  color:var(--pz-brand);font-weight:600}
.poleznoe-chips__n{color:var(--pz-muted);font-weight:400;margin-left:5px}

/* ---------- обложки-заглушки ---------- */
.poleznoe-card__cover{position:relative;overflow:hidden;background:var(--pz-tint);border-radius:10px;flex:none;display:block}
.poleznoe-card__cover img{width:100%;height:100%;object-fit:cover;display:block}
.poleznoe-card__cover:not(:has(img))::before{content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,transparent calc(50% - 1px),var(--pz-brand-line) calc(50% - 1px) calc(50% + 1px),transparent calc(50% + 1px)),
             linear-gradient(0deg,transparent calc(62% - 1px),var(--pz-brand-line) calc(62% - 1px) calc(62% + 1px),transparent calc(62% + 1px))}
.poleznoe-card__cover:not(:has(img))::after{content:"";position:absolute;inset:12%;border:2px solid var(--pz-brand);
  opacity:.22;border-radius:3px;transition:transform .45s cubic-bezier(.16,1,.3,1),opacity .45s}
.poleznoe-card__cover--v2:not(:has(img))::before{background:linear-gradient(90deg,transparent 33%,var(--pz-brand-line) 33% calc(33% + 1px),transparent calc(33% + 1px) 66%,var(--pz-brand-line) 66% calc(66% + 1px),transparent calc(66% + 1px))}
.poleznoe-card__cover--v3:not(:has(img))::before{background:linear-gradient(0deg,transparent 50%,var(--pz-brand-line) 50% calc(50% + 1px),transparent calc(50% + 1px)),linear-gradient(90deg,transparent 25%,var(--pz-brand-line) 25% calc(25% + 1px),transparent calc(25% + 1px) 75%,var(--pz-brand-line) 75% calc(75% + 1px),transparent calc(75% + 1px))}
.poleznoe-card__cover--v4:not(:has(img))::after{inset:20% 12%;border-width:3px}
.poleznoe-card__rubric{position:absolute;left:10px;top:10px;z-index:2;font-size:11px;font-weight:600;
  letter-spacing:.04em;text-transform:uppercase;background:#fff;color:var(--pz-brand);padding:6px 10px;border-radius:30px}

/* ---------- метаданные ---------- */
.poleznoe-meta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;font-size:13px;color:var(--pz-muted);margin-top:10px}
.poleznoe-meta i{font-style:normal;display:inline-flex;align-items:center;gap:5px}
.poleznoe-meta svg{opacity:.55}
.poleznoe-meta__hot{color:var(--pz-accent);font-weight:600}

/* ---------- вид «лентой» ---------- */
.poleznoe-list--feed{display:flex;flex-direction:column;gap:0}
.poleznoe-list--feed .poleznoe-card{display:flex;gap:22px;padding:22px;background:#fff;
  border:1px solid var(--pz-line);margin-top:-1px;
  transition:background .2s,border-color .2s,transform .3s cubic-bezier(.16,1,.3,1),box-shadow .3s}
.poleznoe-list--feed .poleznoe-card:first-child{border-radius:10px 10px 0 0}
.poleznoe-list--feed .poleznoe-card:last-child{border-radius:0 0 10px 10px}
.poleznoe-list--feed .poleznoe-card:hover{background:var(--pz-tint);border-color:var(--pz-brand-line);
  position:relative;z-index:1;transform:translate3d(0,-2px,0);box-shadow:var(--pz-lift)}
.poleznoe-list--feed .poleznoe-card__cover{width:190px;height:130px}
.poleznoe-list--feed .poleznoe-card__title{margin:0;font-size:19px;font-weight:600;line-height:1.3}

/* ---------- вид «сеткой» ---------- */
.poleznoe-list--grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(275px,1fr));gap:22px}
.poleznoe-list--grid .poleznoe-card{background:#fff;border:1px solid var(--pz-line);border-radius:10px;
  overflow:hidden;display:flex;flex-direction:column;
  transition:border-color .2s,transform .32s cubic-bezier(.16,1,.3,1),box-shadow .32s}
.poleznoe-list--grid .poleznoe-card:hover{border-color:var(--pz-brand-line);box-shadow:var(--pz-lift);transform:translate3d(0,-5px,0)}
.poleznoe-list--grid .poleznoe-card__cover{height:160px;border-radius:0;width:100%}
.poleznoe-list--grid .poleznoe-card__body{padding:16px 18px 18px;display:flex;flex-direction:column;flex:1}
.poleznoe-list--grid .poleznoe-card__title{margin:0;font-size:17px;font-weight:600;line-height:1.32}
.poleznoe-list--grid .poleznoe-card__text{flex:1}

.poleznoe-card__title a{color:var(--pz-ink);text-decoration:none;transition:color .2s}
.poleznoe-card:hover .poleznoe-card__title a{color:var(--pz-brand)}
.poleznoe-card__text{margin:8px 0 0;font-size:14.5px;color:var(--pz-muted);line-height:1.5}
.poleznoe-card__cover:hover::after{transform:scale(1.07);opacity:.34}

/* ---------- появление карточек ---------- */
.poleznoe-card--reveal{opacity:0;transform:translate3d(0,22px,0)}
.poleznoe-card--reveal.is-visible{opacity:1;transform:none;
  transition:opacity .55s cubic-bezier(.16,1,.3,1),transform .55s cubic-bezier(.16,1,.3,1)}

.poleznoe__empty{padding:40px 0 60px;color:var(--pz-muted)}
.poleznoe__empty a{color:var(--pz-brand)}
.poleznoe__pager{display:flex;justify-content:center;padding:34px 0 60px}

/* ---------- адаптив по брейкпоинтам сайта ---------- */
@media (width<=768px){
  .poleznoe-hero__frame{display:none}
  .poleznoe-list--feed .poleznoe-card{flex-direction:column;gap:14px}
  .poleznoe-list--feed .poleznoe-card__cover{width:100%;height:170px}
  .poleznoe-search{flex:1 1 100%}
  .poleznoe-search input{width:100%}
  /* теги каруселью: выходим за отступы контейнера его же переменной */
  .poleznoe-chips{flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-x:contain;
    -webkit-overflow-scrolling:touch;scroll-snap-type:x proximity;
    scroll-padding-inline:var(--padding-inline,15px);
    margin-inline:calc(var(--padding-inline,15px) * -1);
    padding-inline:var(--padding-inline,15px);scrollbar-width:none;
    -webkit-mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 34px),transparent 100%);
            mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 34px),transparent 100%)}
  .poleznoe-chips::-webkit-scrollbar{display:none}
  .poleznoe-chips.is-end{-webkit-mask-image:none;mask-image:none}
  .poleznoe-chips__item{scroll-snap-align:start;flex:none}
  .poleznoe-chips__item:hover{transform:none}
  .poleznoe-chips__item:last-child{margin-inline-end:var(--padding-inline,15px)}
}
@media (prefers-reduced-motion:reduce){
  .poleznoe-hero *,.poleznoe-card,.poleznoe-card--reveal{animation:none!important;transition:none!important}
  .poleznoe-hero__mask > span,.poleznoe-hero__lead,.poleznoe-hero__stats{opacity:1!important;transform:none!important}
  .poleznoe-card--reveal{opacity:1!important;transform:none!important}
  .poleznoe-hero__layer{transform:none!important}
}

/* ================= вид «по рубрикам» =================
   Панель скрыта, пока вид не выбран. Размеры и отступы взяты из макета
   списка: избранная статья сверху, дальше секции с компактными карточками. */
.poleznoe-rubr{display:none}
.poleznoe-rubr.is-on{display:block}
.poleznoe-list.is-off,.poleznoe__pager.is-off{display:none}

.poleznoe-featured{display:grid;grid-template-columns:1.15fr 1fr;gap:26px;background:#fff;
  border:1px solid #e3e7ec;border-radius:10px;overflow:hidden;margin-bottom:34px;
  text-decoration:none;color:inherit;
  transition:border-color .2s,box-shadow .32s,transform .32s cubic-bezier(.16,1,.3,1)}
.poleznoe-featured:hover{border-color:#d8dffb;box-shadow:var(--pz-lift);transform:translate3d(0,-3px,0)}
.poleznoe-featured .poleznoe-card__cover{height:100%;min-height:250px;border-radius:0}
.poleznoe-featured__body{padding:30px 32px 30px 6px;display:flex;flex-direction:column;justify-content:center}
.poleznoe-featured__label{font-size:11px;font-weight:600;line-height:1;letter-spacing:.08em;
  text-transform:uppercase;color:#f81255;margin-bottom:12px}
.poleznoe-featured__title{font-size:clamp(22px,2.6vw,30px);font-weight:700;line-height:1.2;
  color:#2e2e2e;letter-spacing:-.02em;transition:color .2s}
.poleznoe-featured:hover .poleznoe-featured__title{color:#3d62eb}
.poleznoe-featured__text{margin-top:12px;color:#7a8593;font-size:15px;max-width:46ch;line-height:1.5}

.poleznoe-sec{margin-bottom:34px}
.poleznoe-sech{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:16px}
.poleznoe-sech__title{margin:0;font-size:21px;font-weight:600;color:#2e2e2e;letter-spacing:-.01em}
.poleznoe-sech__all{font-size:13px;font-weight:600;color:#3d62eb;text-decoration:none;white-space:nowrap}
.poleznoe-sech__all:hover{text-decoration:underline}

.poleznoe-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:18px}
.poleznoe-row__item{background:#fff;border:1px solid #e3e7ec;border-radius:10px;padding:16px 18px;
  text-decoration:none;color:inherit;display:block;
  transition:border-color .2s,box-shadow .3s,transform .3s cubic-bezier(.16,1,.3,1)}
.poleznoe-row__item:hover{border-color:#d8dffb;box-shadow:var(--pz-lift);transform:translate3d(0,-3px,0)}
.poleznoe-row__title{margin:0;font-size:16px;font-weight:600;line-height:1.35;color:#2e2e2e;transition:color .2s}
.poleznoe-row__item:hover .poleznoe-row__title{color:#3d62eb}

@media (width<=768px){
  .poleznoe-featured{grid-template-columns:1fr}
  .poleznoe-featured__body{padding:24px}
  .poleznoe-featured .poleznoe-card__cover{min-height:180px}
}