:root{
  --hse:#0F2D69;          /* фирменный синий ВШЭ */
  --hse-deep:#0A2152;
  --action:#1F5EFF;
  --action-ink:#fff;
  --signal:#F6B800;       /* важные объявления */
  --bg:#F2F5FB;
  --surface:#FFFFFF;
  --text:#14203D;
  --muted:#5A6684;
  --line:#D6DEEE;
  --soft:#E6ECF8;
  --hero-text:#FFFFFF;
  --hero-muted:#B8C6E8;
  --radius-l:20px;
  --radius-s:8px;
  --font:"Onest",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#081533;--surface:#0F1F47;--text:#E4EAF8;--muted:#9EACCD;--line:#223566;--soft:#172A59;
    --action:#6E94FF;--action-ink:#081533;--hse-deep:#06112B;--hse:#0C2458;
  }
}
:root[data-theme="dark"]{
  --bg:#081533;--surface:#0F1F47;--text:#E4EAF8;--muted:#9EACCD;--line:#223566;--soft:#172A59;
  --action:#6E94FF;--action-ink:#081533;--hse-deep:#06112B;--hse:#0C2458;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:calc(env(safe-area-inset-top,0px) + 80px)}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--action)}
:focus-visible{outline:3px solid var(--action);outline-offset:2px;border-radius:4px}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;z-index:20}
.skip:focus{left:8px}

/* Шапка */
.topbar{position:sticky;top:0;z-index:10;background:var(--hse-deep);color:#fff;padding-top:env(safe-area-inset-top,0px);margin-top:calc(-1 * env(safe-area-inset-top,0px))}
.topbar-in{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:64px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.brand-mark{display:grid;place-items:center;width:40px;height:40px;border:2px solid #fff;border-radius:50%;font-weight:800;font-size:14px;letter-spacing:.02em}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:15px}
.brand-text span{font-size:12.5px;color:var(--hero-muted)}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.nav a{color:#DCE4F7;text-decoration:none;padding:8px 14px;border-radius:999px;font-weight:500;font-size:15px;white-space:nowrap}
.nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.nav a[aria-current="page"]{background:#fff;color:var(--hse-deep)}
@media (max-width:860px){
  .topbar-in{flex-direction:column;align-items:stretch;gap:4px;padding-top:10px;padding-bottom:8px}
  .brand-text span{display:none}
  .nav{margin:0 -20px;padding:0 20px}
}

/* Hero */
.hero{background:var(--hse-deep);color:var(--hero-text);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.13) 1px,transparent 1.5px);
  background-size:22px 22px;mask-image:linear-gradient(100deg,transparent 35%,#000 90%);-webkit-mask-image:linear-gradient(100deg,transparent 35%,#000 90%)}
.hero-in{position:relative;display:grid;grid-template-columns:1.35fr 1fr;gap:48px;padding:64px 20px 72px;align-items:end}
.hero h1{font-size:clamp(34px,5.2vw,60px);line-height:1.04;letter-spacing:-.025em;margin:0 0 20px;font-weight:800;max-width:14ch}
.hero-sub{font-size:18px;color:var(--hero-muted);max-width:52ch;margin:0 0 28px}
.prompt{font-family:var(--mono);font-size:15px;display:inline-flex;gap:10px;align-items:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:var(--radius-s);padding:10px 14px}
.prompt b{color:var(--signal);font-weight:600}
.prompt .caret{width:9px;height:18px;background:#fff;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
@media (prefers-reduced-motion:reduce){.prompt .caret{animation:none}}
.next{background:var(--surface);color:var(--text);border-radius:var(--radius-l);padding:26px;box-shadow:0 30px 60px -30px rgba(0,0,0,.5)}
.next h2{font-size:14px;font-weight:600;color:var(--muted);margin:0 0 14px}
.next-when{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.next-when strong{font-size:28px;letter-spacing:-.01em}
.next-when span{color:var(--muted)}
.next h3{font-size:20px;line-height:1.25;margin:12px 0 6px}
.next p{margin:0 0 18px;color:var(--muted);font-size:15px}
@media (max-width:860px){.hero-in{grid-template-columns:1fr;gap:32px;padding-top:44px;padding-bottom:52px}}

/* Общие блоки */
.page{padding-top:48px;padding-bottom:72px}
.page-head{display:flex;justify-content:space-between;align-items:end;gap:20px;flex-wrap:wrap;margin-bottom:28px}
.page-head h1{font-size:clamp(28px,3.6vw,40px);letter-spacing:-.02em;line-height:1.1;margin:0}
.page-head p{margin:8px 0 0;color:var(--muted);max-width:60ch}
h2.block{font-size:24px;letter-spacing:-.01em;margin:0 0 18px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--action);color:var(--action-ink);text-decoration:none;font-weight:600;padding:11px 18px;border-radius:999px;border:0;font:inherit;font-weight:600;cursor:pointer}
.btn.ghost{background:transparent;color:var(--action);box-shadow:inset 0 0 0 1.5px var(--action)}
.tag{display:inline-block;font-size:13px;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--soft);color:var(--text)}
.tag.lecture{background:var(--hse);color:#fff}
.tag.practice{background:transparent;box-shadow:inset 0 0 0 1.5px var(--hse);color:var(--text)}
:root[data-theme="dark"] .tag.practice{box-shadow:inset 0 0 0 1.5px var(--action)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .tag.practice{box-shadow:inset 0 0 0 1.5px var(--action)}}
.tag.olympiad,.tag.important{background:var(--signal);color:#1b1400}
.tag.homework{background:#DDF4E8;color:#0E5A38}
.tag.schedule{background:#FFE9D6;color:#7A3A00}
.seg{display:inline-flex;background:var(--soft);border-radius:999px;padding:4px;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;color:var(--text);font:inherit;font-size:14px;font-weight:500;padding:7px 14px;border-radius:999px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--surface);box-shadow:0 1px 3px rgba(10,33,82,.15);font-weight:600}
.toolbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.check{display:inline-flex;gap:8px;align-items:center;font-size:14px;color:var(--muted);cursor:pointer}
.prose p{margin:0 0 12px}.prose p:last-child{margin:0}
.prose ul,.prose ol{padding-left:22px;margin:0 0 12px}
.prose code{font-family:var(--mono);font-size:.92em;background:var(--soft);padding:1px 6px;border-radius:4px}
.prose pre{overflow-x:auto;background:var(--soft);padding:12px;border-radius:var(--radius-s)}
.empty{color:var(--muted);padding:28px;border:1.5px dashed var(--line);border-radius:var(--radius-l);text-align:center}
.loading{padding:80px 20px;text-align:center;color:var(--muted)}

/* Главная */
.home-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:48px}
@media (max-width:860px){.home-grid{grid-template-columns:1fr;gap:36px}}
.facts{margin:20px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}
.facts li{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.facts li span:first-child{color:var(--muted)}

/* Объявления */
.news-list{display:flex;flex-direction:column;gap:14px}
.ann{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);padding:20px 22px;border-left:5px solid var(--line)}
.ann.k-important,.ann.k-schedule{border-left-color:var(--signal)}
.ann.k-homework{border-left-color:#1FA56B}
.ann.k-info{border-left-color:var(--hse)}
.ann-meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:14px;color:var(--muted);margin-bottom:8px}
.ann h3{margin:0 0 8px;font-size:19px;line-height:1.3}
.ann .pin{font-weight:600;color:var(--text)}
.deadline{font-weight:600;color:var(--text)}

/* Расписание */
.week{margin-bottom:36px}
.week-h{display:flex;align-items:baseline;gap:14px;margin:0 0 12px;font-size:18px}
.week-h span{color:var(--muted);font-weight:500;font-size:15px}
.day{display:grid;grid-template-columns:120px 1fr;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);margin-bottom:10px;overflow:hidden}
.day-date{padding:18px;border-right:1px solid var(--line);display:flex;flex-direction:column}
.dnum{font-size:34px;font-weight:800;line-height:1;letter-spacing:-.02em}
.dmon{font-size:14px;font-weight:600}
.dwd{font-size:13px;color:var(--muted)}
.day-events{display:flex;flex-direction:column}
.ev{display:grid;grid-template-columns:118px 1fr;gap:16px;padding:16px 20px;border-top:1px solid var(--line)}
.ev:first-child{border-top:0}
.ev-time{font-family:var(--mono);font-size:14px;font-weight:600;padding-top:2px}
.ev-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:14px;color:var(--muted)}
.ev h3{margin:6px 0 2px;font-size:17px;line-height:1.3}
.ev p{margin:0;color:var(--muted);font-size:14.5px}
.ev.is-next{background:linear-gradient(90deg,rgba(31,94,255,.10),transparent 70%)}
.ev.is-next .ev-time::after{content:"следующее";display:block;font-family:var(--font);font-size:12px;color:var(--action);font-weight:600;margin-top:4px}
.day.past{opacity:.55}
.day.olymp{border:2px solid var(--signal)}
@media (max-width:640px){
  .day{grid-template-columns:1fr}
  .day-date{flex-direction:row;align-items:baseline;gap:8px;border-right:0;border-bottom:1px solid var(--line);padding:12px 16px}
  .dnum{font-size:22px}
  .ev{grid-template-columns:1fr;gap:4px;padding:14px 16px}
}

/* Преподаватели */
.team{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.person{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-l);overflow:hidden;display:flex;flex-direction:column}
.person-photo{aspect-ratio:4/3;background:var(--hse);color:#fff;display:grid;place-items:center;font-size:56px;font-weight:800;letter-spacing:-.02em;position:relative}
.person-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.person-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.person h3{margin:0;font-size:20px;line-height:1.2}
.person .role{color:var(--action);font-weight:600;font-size:15px}
.person p{margin:0;color:var(--muted);font-size:15px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto;padding-top:8px}

/* Материалы */
.mat-layout{display:grid;grid-template-columns:230px 1fr;gap:40px;align-items:start}
.mat-nav{position:sticky;top:calc(env(safe-area-inset-top,0px) + 88px);display:flex;flex-direction:column;gap:2px}
.mat-nav a{color:var(--text);text-decoration:none;padding:7px 12px;border-radius:var(--radius-s);font-size:15px;display:flex;justify-content:space-between;gap:8px}
.mat-nav a:hover{background:var(--soft)}
.mat-nav a span{color:var(--muted);font-size:13px}
.search{width:100%;font:inherit;padding:12px 16px;border-radius:999px;border:1.5px solid var(--line);background:var(--surface);color:var(--text);margin-bottom:28px}
.search:focus{outline:none;border-color:var(--action)}
.mat-sec{margin-bottom:40px}
.mat-sec h2{font-size:22px;margin:0 0 4px;letter-spacing:-.01em}
.mat-sec > p{margin:0 0 14px;color:var(--muted);font-size:15px}
.res-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}
.res{display:flex;flex-direction:column;gap:3px;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);text-decoration:none;color:var(--text)}
a.res:hover{border-color:var(--action)}
.res-title{font-weight:600;line-height:1.3}
.res-host{font-family:var(--mono);font-size:12.5px;color:var(--action);word-break:break-all}
.res-note{font-size:14px;color:var(--muted)}
.res.book .res-host{color:var(--muted);font-family:var(--font)}
@media (max-width:860px){.mat-layout{grid-template-columns:1fr}.mat-nav{position:static;flex-direction:row;overflow-x:auto;gap:6px}.mat-nav a{white-space:nowrap;background:var(--soft)}}

/* Подвал */
.footer{background:var(--hse-deep);color:var(--hero-muted);font-size:14px}
.footer-in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:28px 20px}
.footer a{color:#fff}
.footer strong{color:#fff}

/* Компактные объявления перед главным экраном */
.home-notice{background:var(--surface);border-bottom:1px solid var(--line)}
.notice-in{display:flex;align-items:center;gap:20px;padding-top:12px;padding-bottom:12px;font-size:14px}
.notice-in>strong{color:var(--text);flex-shrink:0}
.notice-items{display:flex;flex-wrap:wrap;gap:6px 20px;flex:1;min-width:0}
.notice-items a{overflow-wrap:anywhere;text-underline-offset:3px}
.notice-pin{color:var(--text);background:var(--signal);border-radius:4px;padding:2px 5px;font-size:11px;font-weight:700}
.notice-all{white-space:nowrap;font-weight:600}
.hero-links{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0}
.materials-feature{padding:24px;border:1px solid var(--line);border-radius:var(--radius-l);background:var(--surface);margin-bottom:32px}
.materials-feature h2{margin-top:0}.materials-feature p{color:var(--muted)}
.ann,.mat-sec{scroll-margin-top:140px}
@media(max-width:600px){.notice-in{align-items:flex-start;gap:8px;flex-direction:column}.notice-items{flex-direction:column;gap:8px}.notice-all{align-self:flex-end}.hero-links .btn{flex:1;text-align:center}}