/* Раздел контента academy.teachermentor.ru. Токены и скругления — как на главной сайта. Мобильная версия первой. */
@font-face{font-family:Onest;src:url(/fonts/onest-variable.woff2) format("woff2");font-weight:100 900;font-display:swap}
:root{
  --ink:#181A26;--muted:#5B6173;--blue:#3454FF;--blue-text:#2A45E0;--blue-dark:#2339C2;
  --line:#E3E7EF;--soft:#F5F9FF;--bg:#fff;--gutter:20px;--r-card:24px;--r-btn:12px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Onest,Arial,Helvetica,sans-serif;color:var(--ink);background:var(--bg);font-size:17px;line-height:1.6;text-wrap:pretty}
img{max-width:100%;height:auto}
a{color:var(--blue-text);text-underline-offset:3px}
a:focus-visible,button:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}
.container{width:min(100% - var(--gutter)*2,1080px);margin-inline:auto}

/* кнопка */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;background:var(--blue);color:#fff;border-radius:var(--r-btn);font-weight:500;font-size:16px;line-height:1.2;text-decoration:none;text-align:center;transition:background-color .2s}
.btn:hover{background:var(--blue-dark)}

/* шапка */
.top{position:sticky;top:0;z-index:50;padding-top:10px;background:linear-gradient(#fff 70%,transparent)}
.top__bar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px;padding:8px 8px 8px 14px;background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:12px;backdrop-filter:blur(5px)}
.top__logo{display:flex;flex:none}
.top__logo img{display:block;width:120px;height:auto}
.top__nav{display:none;gap:24px}
.top__nav a{color:var(--ink);text-decoration:none;font-size:15px}
.top__nav a:hover,.top__nav a[aria-current]{color:var(--blue-text)}
.top .btn{min-height:44px;padding:0 14px;font-size:13px}
.top__nav--m{display:flex;gap:6px;margin-top:8px;overflow-x:auto;scrollbar-width:none}
.top__nav--m a{flex:none;padding:7px 14px;border:1px solid var(--line);border-radius:99px;background:#fff;color:var(--ink);text-decoration:none;font-size:14px}
.top__nav--m a[aria-current]{border-color:var(--blue);color:var(--blue-text)}

/* страница */
.page{padding:28px 0 64px}
.crumbs{margin:0 0 18px;font-size:14px;color:var(--muted)}
.crumbs a{color:var(--muted)}
h1{margin:0 0 14px;font-size:clamp(30px,6.6vw,48px);line-height:1.12;font-weight:600;letter-spacing:-.02em;text-wrap:balance}
.lead{margin:0 0 20px;font-size:clamp(18px,2.4vw,21px);line-height:1.5;color:var(--muted)}
.meta{display:flex;flex-wrap:wrap;gap:4px 14px;margin:0 0 24px;font-size:14px;color:var(--muted)}
.meta span+span::before{content:"·";margin-right:14px}
.head{max-width:720px}
.hero{margin:8px 0 8px}
.hero img{display:block;width:100%;border-radius:var(--r-card)}

/* текст статьи: ~720 px, 18–19 px, интерлиньяж 1.6 */
.prose{max-width:720px;font-size:18px;line-height:1.6}
.prose>*{margin-block:0 1.1em}
.prose h2{margin:2em 0 .6em;font-size:clamp(25px,4vw,31px);line-height:1.2;font-weight:600;letter-spacing:-.015em;scroll-margin-top:96px}
.prose h3{margin:1.6em 0 .5em;font-size:22px;line-height:1.25;font-weight:600;scroll-margin-top:96px}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin-bottom:.4em}
.prose li::marker{color:var(--blue)}
.prose figure{margin:1.8em 0}
.prose figure img{display:block;width:100%;border-radius:16px}
.prose figcaption{margin-top:8px;font-size:14px;color:var(--muted)}
.prose blockquote{margin:1.8em 0;padding:2px 0 2px 20px;border-left:3px solid var(--blue);font-size:20px;line-height:1.5}
.prose blockquote p{margin:0}
.callout{margin:1.8em 0;padding:20px 22px;background:var(--soft);border:1px solid var(--line);border-radius:16px}
.callout .t{display:block;margin-bottom:6px;font-weight:600}
.callout p{margin:0 0 .6em}.callout :last-child{margin-bottom:0}
.cta{margin:2em 0;padding:26px 22px;background:var(--blue);color:#fff;border-radius:var(--r-card);text-align:center}
.cta p{margin:0 0 16px;font-size:22px;line-height:1.3;font-weight:600}
.cta .btn{background:#fff;color:var(--blue-text)}
.cta .btn:hover{background:var(--soft)}

/* оглавление */
.toc{max-width:720px;margin:0 0 28px;padding:16px 20px;background:var(--soft);border:1px solid var(--line);border-radius:16px}
.toc__t{margin:0 0 8px;font-size:15px;font-weight:600}
.toc ol{margin:0;padding-left:1.2em;font-size:16px;line-height:1.45}
.toc li{margin-bottom:6px}
.toc a{color:var(--ink);text-decoration:none}
.toc a:hover{color:var(--blue-text);text-decoration:underline}

/* видео: фасад с обложкой, iframe по клику */
.rv{position:relative;aspect-ratio:16/9;border-radius:var(--r-card);overflow:hidden;background:#101426;margin:1.8em 0}
.rv--lead{margin:8px 0 28px}
.rv__cover{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:none;cursor:pointer;display:block}
.rv__cover img{width:100%;height:100%;object-fit:cover;display:block}
.rv__play{position:absolute;left:50%;top:50%;width:clamp(56px,9vw,88px);aspect-ratio:1;transform:translate(-50%,-50%);display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.93);color:var(--blue);box-shadow:0 6px 28px rgba(25,59,136,.35);transition:transform .16s}
.rv__play svg{width:40%;height:40%;margin-left:6%}
.rv__cover:hover .rv__play{transform:translate(-50%,-50%) scale(1.08)}
.rv__hint{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);padding:8px 14px;border-radius:99px;background:#fff;font-size:14px;white-space:nowrap}
.rv iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.cap{margin:-.6em 0 1.4em;font-size:14px;color:var(--muted)}

/* таймкоды, было/стало */
.tc{max-width:720px;margin:0 0 28px;padding:0;list-style:none;border-top:1px solid var(--line)}
.tc li{display:flex;gap:16px;padding:10px 0;border-bottom:1px solid var(--line);font-size:17px;line-height:1.4}
.tc time{flex:none;min-width:64px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--blue-text)}
.sec-h{max-width:720px;margin:2em 0 .6em;font-size:clamp(25px,4vw,31px);line-height:1.2;font-weight:600;letter-spacing:-.015em}
.ba{display:grid;gap:12px;max-width:720px;margin:0 0 8px}
.ba__row{padding:16px 18px;background:var(--soft);border:1px solid var(--line);border-radius:16px}
.ba__l{margin:0 0 6px;font-size:15px;color:var(--muted)}
.ba__v{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;font-size:clamp(24px,5vw,32px);font-weight:600;line-height:1.15;letter-spacing:-.01em}
.ba__v s{color:var(--muted);font-weight:400;text-decoration-thickness:1px}
.ba__v b{color:var(--blue-text);font-weight:600}
.ba__v i{font-style:normal;color:var(--muted);font-size:.8em}

/* автор */
.author{display:flex;gap:16px;max-width:720px;margin:48px 0 0;padding:22px;border:1px solid var(--line);border-radius:var(--r-card)}
.author__ava{flex:none;display:grid;place-items:center;width:56px;height:56px;border-radius:50%;background:var(--blue);color:#fff;font-weight:600;font-size:18px}
.author__n{margin:0;font-weight:600;font-size:18px}
.author__r{margin:0 0 8px;font-size:14px;color:var(--muted)}
.author__t{margin:0;font-size:16px;line-height:1.5}
.after{max-width:720px;margin-top:28px}

/* список: карточки */
.cards{display:grid;gap:16px;margin-top:28px}
.card{display:flex;flex-direction:column;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);color:inherit;text-decoration:none;transition:border-color .2s,box-shadow .2s}
.card:hover{border-color:#C9D1E6;box-shadow:0 8px 28px rgba(24,26,38,.08)}
.card__img{aspect-ratio:16/9;background:var(--soft);display:grid;place-items:center;color:var(--blue-text);font-weight:600}
.card__img img{width:100%;height:100%;object-fit:cover;display:block}
.card__body{display:flex;flex-direction:column;gap:8px;padding:18px 20px 20px}
.card__k{font-size:14px;color:var(--blue-text);font-weight:500}
.card h2{margin:0;font-size:21px;line-height:1.25;font-weight:600;letter-spacing:-.01em}
.card p{margin:0;font-size:16px;line-height:1.5;color:var(--muted)}
.card__m{margin-top:auto;padding-top:4px;font-size:14px;color:var(--muted)}
.empty{margin-top:28px;color:var(--muted)}

/* подвал: упрощённая синяя карточка с главной */
.foot{margin:48px auto 12px;width:min(100% - 24px,1680px);color:#fff}
.foot a{color:inherit;text-decoration:none}
.foot a:focus-visible{outline:2px solid #fff;outline-offset:3px}
.foot__card{position:relative;isolation:isolate;overflow:hidden;border-radius:24px;background:linear-gradient(155deg,#4A68FF 0%,#3454FF 45%,#2B45E2 100%);padding:32px 24px}
.foot__card::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);background-size:32px 32px;mask-image:linear-gradient(160deg,#000,transparent 75%);-webkit-mask-image:linear-gradient(160deg,#000,transparent 75%)}
.foot__logo img{display:block;width:200px;height:auto;margin-bottom:24px}
.foot__grid{display:grid;gap:24px}
.foot__col{display:flex;flex-direction:column;gap:6px;font-size:16px}
.foot__col a{color:rgba(255,255,255,.9)}
.foot__col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.foot__col small{font-size:14px;color:rgba(255,255,255,.7)}
.foot__org{margin:24px 0 0;font-size:14px;line-height:1.55;color:rgba(255,255,255,.82)}

@media (min-width:640px){
  .cards{grid-template-columns:1fr 1fr}
  .ba{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
}
@media (min-width:900px){
  :root{--gutter:32px}
  body{font-size:18px}
  .top{padding-top:16px}
  .top__bar{min-height:70px;padding:9px 10px 9px 18px}
  .top__logo img{width:150px}
  .top__nav{display:flex}
  .top__nav--m{display:none}
  .top .btn{min-height:50px;padding:0 23px;font-size:14px}
  .page{padding:48px 0 96px}
  .prose{font-size:19px}
  .card--first{grid-column:1/-1;flex-direction:row}
  .card--first .card__img{flex:0 0 55%;aspect-ratio:auto;min-height:300px}
  .card--first .card__body{justify-content:center;padding:32px}
  .card--first h2{font-size:28px}
  .foot__card{padding:44px 52px}
  .foot__grid{grid-template-columns:1fr 1fr 1fr}
  .cta{padding:34px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}