[hidden]{display:none!important}
:root{
  --bg:#f5f5f7; --card:#ffffff; --fg:#1d1d1f; --fg2:#6e6e73; --fg3:#86868b;
  --sep:rgba(0,0,0,.08); --fill:rgba(118,118,128,.12); --fill2:rgba(118,118,128,.08);
  --blue:#0071e3; --link:#0066cc; --green:#30d158; --red:#ff3b30; --orange:#ff9f0a;
  --glass:rgba(251,251,253,.74); --glass-line:rgba(0,0,0,.07);
  --shadow:0 2px 6px rgba(0,0,0,.03),0 12px 32px rgba(0,0,0,.06);
  --shadow-hi:0 4px 12px rgba(0,0,0,.05),0 22px 48px rgba(0,0,0,.10);
  --tile-dark:#1d1d1f; --tile-dark-fg:#f5f5f7; --thumb:#ffffff; --code:#f5f5f7;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Inter,system-ui,sans-serif;
  --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,monospace;
  --tabbar:0px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#000; --card:#1c1c1e; --fg:#f5f5f7; --fg2:#a1a1a6; --fg3:#6e6e73;
    --sep:rgba(255,255,255,.1); --fill:rgba(118,118,128,.24); --fill2:rgba(118,118,128,.14);
    --blue:#0a84ff; --link:#2997ff; --red:#ff453a;
    --glass:rgba(22,22,23,.74); --glass-line:rgba(255,255,255,.08);
    --shadow:none; --shadow-hi:0 0 0 1px rgba(255,255,255,.06);
    --tile-dark:#1c1c1e; --thumb:#636366; --code:#2c2c2e;
  }
}
:root[data-theme="dark"]{
  --bg:#000; --card:#1c1c1e; --fg:#f5f5f7; --fg2:#a1a1a6; --fg3:#6e6e73;
  --sep:rgba(255,255,255,.1); --fill:rgba(118,118,128,.24); --fill2:rgba(118,118,128,.14);
  --blue:#0a84ff; --link:#2997ff; --red:#ff453a;
  --glass:rgba(22,22,23,.74); --glass-line:rgba(255,255,255,.08);
  --shadow:none; --shadow-hi:0 0 0 1px rgba(255,255,255,.06);
  --tile-dark:#1c1c1e; --thumb:#636366; --code:#2c2c2e;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-padding-top:110px}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.47 var(--font);letter-spacing:-.022em;-webkit-font-smoothing:antialiased;padding-bottom:calc(var(--tabbar) + env(safe-area-inset-bottom))}
button{font:inherit;color:inherit;cursor:pointer;letter-spacing:inherit}
a{color:var(--link);text-decoration:none}
svg{flex:none}
input,select,textarea{font:inherit;letter-spacing:inherit}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.glass{background:var(--glass);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px)}
.muted{color:var(--fg2)}
.grad{background:linear-gradient(90deg,#0a84ff 0%,#5e5ce6 35%,#bf5af2 65%,#ff375f 100%);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- top nav ---------- */
.gnav{position:sticky;top:0;z-index:30;border-bottom:1px solid var(--glass-line)}
.gnav .wrap{height:52px;display:flex;align-items:center;gap:14px}
.logo{display:flex;align-items:center;gap:8px;font-weight:600;font-size:15px;color:var(--fg);letter-spacing:-.01em;white-space:nowrap}
.logo i{width:24px;height:24px;border-radius:7px;background:linear-gradient(135deg,#0a84ff,#bf5af2);display:grid;place-items:center;color:#fff;font:700 10px/1 var(--font);font-style:normal}
.gnav nav{display:flex;gap:4px;margin-left:auto}
.gnav nav a{color:var(--fg2);font-size:13.5px;padding:6px 11px;border-radius:980px;letter-spacing:-.01em}
.gnav nav a:hover{color:var(--fg)}
.gnav nav a.on{color:var(--fg);background:var(--fill2)}
.addbtn{display:inline-flex;align-items:center;gap:6px;border:0;background:var(--blue);color:#fff;border-radius:980px;padding:6px 13px 6px 11px;font-size:13px;font-weight:500;letter-spacing:-.01em;white-space:nowrap}
.addbtn:hover{filter:brightness(1.08)}
.addbtn.lg{font-size:15px;padding:9px 17px 9px 14px}
.avatar{width:32px;height:32px;border-radius:50%;border:0;background:linear-gradient(135deg,#8e8e93,#636366);color:#fff;font:600 13px var(--font);display:grid;place-items:center;flex:none}
.round{width:32px;height:32px;border-radius:50%;border:0;background:none;color:var(--fg2);display:grid;place-items:center;flex:none}
.round:hover{background:var(--fill2);color:var(--fg)}

/* ---------- bottom tab bar (телефон) ---------- */
.tabbar{display:none}
.foot{color:var(--fg3);font-size:13px;line-height:1.5;padding-top:8px;padding-bottom:40px;text-align:center}
@media (max-width:760px){
  :root{--tabbar:56px}
  .gnav nav,.gnav .addbtn span{display:none}
  .gnav .addbtn{margin-left:auto;padding:7px}
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:40;height:calc(56px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);border-top:1px solid var(--glass-line)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:10.5px;font-weight:500;color:var(--fg3);letter-spacing:0}
  .tabbar a.on{color:var(--blue)}
  .foot{padding-bottom:24px}
}

/* ---------- page ---------- */
.page{padding:36px 0 60px;animation:fade .35s ease both}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.ptitle{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.ptitle h1{margin:0;font-size:40px;letter-spacing:-.035em;line-height:1.1}
.ptitle p{margin:4px 0 0;color:var(--fg2)}
.section-h{display:flex;align-items:baseline;justify-content:space-between;margin:40px 0 14px}
.section-h h2{margin:0;font-size:24px;letter-spacing:-.03em}
.section-h a{font-size:15px}
.empty{grid-column:1/-1;text-align:center;color:var(--fg2);padding:48px 16px;background:var(--card);border-radius:22px;box-shadow:var(--shadow)}
.empty b{display:block;color:var(--fg);font-size:19px;margin-bottom:4px}

/* ---------- home ---------- */
.hello{font-size:clamp(32px,5vw,48px);letter-spacing:-.04em;line-height:1.08;margin:0}
.hello-sub{color:var(--fg2);margin:6px 0 0;font-size:19px}
.chooser{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:28px}
.tile{position:relative;overflow:hidden;text-align:left;border:0;border-radius:28px;padding:32px;min-height:240px;display:flex;flex-direction:column;background:var(--card);box-shadow:var(--shadow);transition:transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .35s;color:var(--fg)}
.tile:hover{transform:scale(1.012);box-shadow:var(--shadow-hi)}
.tile.dark{background:var(--tile-dark);color:var(--tile-dark-fg)}
.tile .k{font-size:14px;font-weight:600;color:var(--fg2)}
.tile.dark .k,.tile.dark .subj{color:#a1a1a6}
.tile h2{margin:4px 0 0;font-size:36px;line-height:1.08;letter-spacing:-.035em}
.tile .big{margin-top:auto;display:flex;align-items:flex-end;justify-content:space-between;gap:16px}
.tile .num{font-size:84px;line-height:.9;font-weight:700;letter-spacing:-.06em;padding-bottom:4px}
.tile .subj{display:flex;flex-direction:column;align-items:flex-end;gap:5px;font-size:13px;color:var(--fg2);text-align:right}
.tile .subj span{display:flex;align-items:center;gap:6px}
.tile .subj i{width:8px;height:8px;border-radius:50%}
.tile .go{position:absolute;top:28px;right:28px;width:36px;height:36px;border-radius:50%;background:var(--fill);display:grid;place-items:center}
.tile.dark .go{background:rgba(255,255,255,.14)}
.tile .glow{position:absolute;width:420px;height:420px;border-radius:50%;filter:blur(80px);opacity:.28;right:-140px;top:-180px;pointer-events:none}

.upnext{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.dcard{background:var(--card);border-radius:20px;padding:18px 18px 16px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:6px;color:var(--fg);position:relative;overflow:hidden;min-height:132px}
.dcard .when{font-size:13px;font-weight:600}
.dcard .t{font-weight:600;font-size:16px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.dcard .s{font-size:13px;color:var(--fg2);margin-top:auto}
.dcard::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--c)}

.recent{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2px;background:var(--card);border-radius:22px;padding:8px;box-shadow:var(--shadow)}

/* ---------- library ---------- */
.controls{position:sticky;top:52px;z-index:20;padding:12px 22px;margin:0 -22px 18px;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;border-bottom:1px solid transparent}
.controls.stuck{border-bottom-color:var(--glass-line)}
.controls:not(.stuck){background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none}
.seg{display:inline-grid;grid-auto-flow:column;grid-auto-columns:1fr;background:var(--fill);border-radius:10px;padding:2px;position:relative}
.seg button{position:relative;z-index:1;border:0;background:none;padding:6px 16px;font-size:14px;font-weight:500;border-radius:8px;white-space:nowrap;color:var(--fg)}
.seg button .c{color:var(--fg3);font-weight:400;margin-left:5px;font-size:13px}
.seg .thumb{position:absolute;z-index:0;top:2px;bottom:2px;border-radius:8px;background:var(--thumb);box-shadow:0 3px 8px rgba(0,0,0,.12),0 3px 1px rgba(0,0,0,.04);transition:left .3s cubic-bezier(.2,.8,.2,1),width .3s}
.seg.full{display:grid;width:100%}
.searchbox{position:relative;width:min(280px,100%)}
.searchbox input{width:100%;border:0;background:var(--fill);color:var(--fg);border-radius:10px;padding:8px 12px 8px 32px;font-size:15px;outline:none;-webkit-appearance:none}
.searchbox input:focus{box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 35%,transparent)}
.searchbox svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--fg3)}

.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;align-items:start}
.card{background:var(--card);border-radius:22px;box-shadow:var(--shadow);overflow:hidden;animation:rise .5s cubic-bezier(.2,.8,.2,1) both}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.card>header{display:flex;align-items:center;gap:14px;padding:22px 22px 12px}
.icon{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;color:#fff;font:600 23px/1 var(--font);box-shadow:inset 0 0 0 .5px rgba(255,255,255,.25),0 4px 10px rgba(0,0,0,.08);flex:none}
.icon.sm{width:30px;height:30px;border-radius:8px;font-size:15px}
.card>header h3{margin:0;font-size:20px;letter-spacing:-.025em;line-height:1.2}
.card>header small{color:var(--fg2);font-size:14px}
.rows{padding:0 8px 8px}
.row{display:flex;align-items:center;gap:14px;width:100%;text-align:left;border:0;background:none;padding:11px 14px;border-radius:12px;position:relative;color:var(--fg)}
.row:hover{background:var(--fill2)}
.row+.row::before{content:"";position:absolute;top:0;left:56px;right:14px;border-top:1px solid var(--sep)}
.row:hover::before,.row:hover+.row::before{opacity:0}
.row.pair{cursor:default}
.row.pair:hover{background:none}
.row.pair:hover::before,.row.pair:hover+.row::before{opacity:1}
.badge{width:28px;height:28px;border-radius:8px;background:var(--fill2);display:grid;place-items:center;font:600 12px var(--font);color:var(--fg2);flex:none;font-variant-numeric:tabular-nums}
.rt{flex:1;min-width:0;line-height:1.3}
.rt b{display:block;font-weight:500;font-size:16px;letter-spacing:-.015em}
.rt small{display:block;color:var(--fg2);font-size:13px;margin-top:2px}
.chip{font:600 10.5px var(--font);letter-spacing:.02em;text-transform:uppercase;color:var(--fg3)}
.chev{color:var(--fg3);opacity:.7}
.pills{display:flex;gap:6px;flex:none;flex-wrap:wrap;justify-content:flex-end}
/* много кнопок (листок задач и его семинары) — кнопки уходят под название */
.row.pair.many{flex-wrap:wrap;row-gap:8px}
.row.pair.many .rt{flex-basis:calc(100% - 42px)}
.row.pair.many .pills{flex-basis:100%;justify-content:flex-start;padding-left:42px}
.mini{border:0;background:var(--fill2);color:var(--link);font-size:13px;font-weight:500;padding:5px 12px;border-radius:980px}
.mini:hover{background:var(--blue);color:#fff}
.new{display:inline-block;vertical-align:2px;margin-left:6px;font:600 10px var(--font);letter-spacing:.02em;text-transform:uppercase;color:var(--blue);background:color-mix(in srgb,var(--blue) 12%,transparent);padding:2px 6px;border-radius:980px}
.src{display:inline-flex;align-items:center;gap:4px}

/* ---------- deadlines ---------- */
.dgroup{margin-bottom:26px}
.dgroup h3{margin:0 0 10px;font-size:15px;color:var(--fg2);font-weight:600;letter-spacing:-.01em}
.dlist{background:var(--card);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.drow{display:flex;gap:16px;align-items:center;padding:14px 18px;position:relative}
.drow+.drow{border-top:1px solid var(--sep)}
.dday{width:50px;text-align:center;flex:none;line-height:1.1}
.dday b{display:block;font-size:24px;letter-spacing:-.03em}
.dday small{font-size:12px;color:var(--fg2);text-transform:uppercase;font-weight:600}
.dmain{flex:1;min-width:0}
.dmain .t{font-weight:500;line-height:1.35}
.dmain .m{font-size:13px;color:var(--fg2);margin-top:3px;display:flex;flex-wrap:wrap;gap:4px 10px;align-items:center}
.type{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:600;color:var(--c)}
.type::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--c)}
.left{font-size:13px;font-weight:600;white-space:nowrap;color:var(--fg2)}
.left.soon{color:var(--red)}
.drow.past{opacity:.5}
.status{font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:980px;background:var(--fill2);color:var(--fg2)}
.status.ok{background:color-mix(in srgb,var(--green) 18%,transparent);color:#1f9d4c}
.xbtn{border:0;background:none;color:var(--fg3);padding:4px;border-radius:6px}
.xbtn:hover{color:var(--red);background:var(--fill2)}

/* ---------- settings (профиль, админ) ---------- */
.settings{display:grid;gap:26px;max-width:720px}
.group{background:var(--card);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.group>h3{margin:0;padding:18px 20px 4px;font-size:13px;color:var(--fg2);font-weight:600;text-transform:uppercase;letter-spacing:.03em;display:flex;align-items:center;gap:10px}
.group>h3 .icon{width:28px;height:28px;border-radius:8px;font-size:14px}
.item{padding:14px 20px;display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.item+.item{border-top:1px solid var(--sep)}
.item p{margin:0;color:var(--fg2);font-size:15px;line-height:1.45;flex:1 1 300px}
.item ol{margin:0;padding-left:20px;color:var(--fg2);font-size:15px;line-height:1.6;flex:1 1 100%}
.item ol b{color:var(--fg);font-weight:600}
.ok-dot{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:#1f9d4c}
.ok-dot::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--green)}
.off-dot{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--fg3)}
.off-dot::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--fg3)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;background:var(--blue);color:#fff;border-radius:980px;padding:8px 16px;font-size:15px;font-weight:500;white-space:nowrap}
.btn:hover{filter:brightness(1.08)}
.btn:disabled{opacity:.5}
.btn.ghost{background:var(--fill2);color:var(--link)}
.btn.danger{background:var(--fill2);color:var(--red)}
.copy{display:flex;gap:8px;align-items:center;width:100%}
.copy code{flex:1;min-width:0;font:13px var(--mono);background:var(--fill2);border-radius:10px;padding:10px 12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;letter-spacing:0}
.switch{position:relative;width:51px;height:31px;flex:none}
.switch input{opacity:0;width:0;height:0}
.switch span{position:absolute;inset:0;border-radius:980px;background:var(--fill);transition:.25s;cursor:pointer}
.switch span::after{content:"";position:absolute;left:2px;top:2px;width:27px;height:27px;border-radius:50%;background:#fff;box-shadow:0 3px 8px rgba(0,0,0,.15);transition:.25s}
.switch input:checked+span{background:var(--green)}
.switch input:checked+span::after{transform:translateX(20px)}
.warn{font-size:14px;color:#b26a00;background:color-mix(in srgb,var(--orange) 14%,transparent);border-radius:12px;padding:10px 14px;width:100%}
.err-list{font:12.5px/1.5 var(--mono);color:var(--red);white-space:pre-wrap;margin:0;width:100%;letter-spacing:0}
.table{width:100%;border-collapse:collapse;font-size:14px}
.table td,.table th{padding:10px 20px;text-align:left;border-top:1px solid var(--sep)}
.table th{font-size:12px;color:var(--fg2);font-weight:600;border-top:0}
.subj-edit{display:grid;gap:10px;width:100%}
.subj-edit .two{display:grid;grid-template-columns:70px 1fr;gap:10px}

/* ---------- forms ---------- */
.inp{width:100%;border:0;background:var(--fill2);color:var(--fg);border-radius:10px;padding:10px 12px;font-size:16px;letter-spacing:-.01em;outline:none;-webkit-appearance:none;appearance:none;min-height:42px}
textarea.inp{min-height:80px;resize:vertical;font:14px/1.5 var(--mono);letter-spacing:0}
.inp:focus{box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 35%,transparent)}
.inp::placeholder{color:var(--fg3)}
select.inp{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%2386868b' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:30px}
.field{display:grid;gap:7px}
.field>span{font-size:13px;font-weight:600;color:var(--fg2)}
.field>span em{font-style:normal;font-weight:400;color:var(--fg3)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{border:0;background:var(--fill2);border-radius:980px;padding:6px 12px;font-size:14px;color:var(--fg)}
.chips button.on{background:var(--blue);color:#fff}
.formerr{color:var(--red);font-size:14px}
.submit{border:0;background:var(--blue);color:#fff;border-radius:12px;padding:13px;font-size:17px;font-weight:500;position:relative;overflow:hidden;width:100%}
.submit:disabled{opacity:.55}
.submit i{position:absolute;left:0;top:0;bottom:0;background:rgba(255,255,255,.22);width:0;transition:width .2s}
.drop{border:1.5px dashed var(--sep);border-radius:14px;padding:22px 16px;text-align:center;color:var(--fg2);cursor:pointer;font-size:15px;display:block}
.drop:hover,.drop.over{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 6%,transparent)}
.drop b{color:var(--link);font-weight:500}
.drop small{display:block;margin-top:4px;font-size:12.5px;color:var(--fg3)}
.drop.has{border-style:solid;text-align:left;display:flex;align-items:center;gap:12px}
.drop .fi{width:40px;height:40px;border-radius:10px;background:var(--fill);display:grid;place-items:center;font:700 10px var(--font);text-transform:uppercase;color:var(--fg2);flex:none}
.drop .fn{flex:1;min-width:0}
.drop .fn b{display:block;color:var(--fg);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.preview{font:12.5px/1.5 var(--mono);color:var(--fg2);background:var(--fill2);border-radius:10px;padding:10px 12px;word-break:break-all;letter-spacing:0}

/* ---------- sheet ---------- */
.sheet-wrap{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:20px;background:rgba(0,0,0,.32);opacity:0;visibility:hidden;transition:opacity .25s,visibility 0s .25s}
.sheet-wrap.open{opacity:1;visibility:visible;transition:opacity .25s}
.sheet{width:min(560px,100%);max-height:calc(100dvh - 40px);overflow:auto;background:var(--card);border-radius:22px;box-shadow:0 30px 80px rgba(0,0,0,.3);transform:translateY(16px) scale(.98);transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.sheet-wrap.open .sheet{transform:none}
.sheet-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;padding:16px 18px 12px 24px;border-bottom:1px solid var(--sep);background:var(--card)}
.sheet-head h2{margin:0;font-size:19px;letter-spacing:-.02em}
.sheet-body{padding:20px 24px 24px;display:grid;gap:18px}
.done{text-align:center;padding:36px 24px 30px}
.done .ok{width:64px;height:64px;border-radius:50%;background:var(--green);color:#fff;display:grid;place-items:center;margin:0 auto 16px;animation:pop .45s cubic-bezier(.2,1.4,.4,1)}
@keyframes pop{from{transform:scale(.4);opacity:0}to{transform:none;opacity:1}}
.done h3{margin:0 0 6px;font-size:22px}
.done p{margin:0 auto;color:var(--fg2);max-width:360px}
.done .acts{display:flex;gap:10px;justify-content:center;margin-top:22px;flex-wrap:wrap}

/* ---------- viewer ---------- */
.viewer{position:fixed;inset:0;z-index:60;background:var(--bg);display:grid;grid-template-rows:auto 1fr;opacity:0;visibility:hidden;transform:scale(.985);transition:opacity .3s,transform .35s cubic-bezier(.2,.8,.2,1),visibility 0s .35s}
.viewer.open{opacity:1;visibility:visible;transform:none;transition:opacity .3s,transform .35s cubic-bezier(.2,.8,.2,1)}
body.viewing{overflow:hidden}
.vbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;height:52px;padding:0 12px;padding-top:env(safe-area-inset-top);box-sizing:content-box;border-bottom:1px solid var(--glass-line);position:relative;z-index:6}
.vleft,.vright{display:flex;align-items:center;gap:4px;min-width:0}
.vright{justify-content:flex-end}
.back{display:inline-flex;align-items:center;gap:2px;border:0;background:none;color:var(--link);font-size:15px;padding:6px 8px 6px 4px;border-radius:8px;white-space:nowrap}
.back:hover{background:var(--fill2)}
.vtitle{text-align:center;min-width:0;max-width:52vw}
.vtitle b{display:block;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vtitle small{display:flex;align-items:center;justify-content:center;gap:6px;font-size:11.5px;color:var(--fg2);white-space:nowrap}
.vtitle small i{width:7px;height:7px;border-radius:50%;flex:none}
.tb{width:32px;height:32px;border:0;background:none;border-radius:8px;display:grid;place-items:center;color:var(--fg2)}
.tb:hover:not(:disabled){background:var(--fill2);color:var(--fg)}
.tb:disabled{opacity:.3;cursor:default}
.tb.on{color:var(--blue)}
.pos{font:500 12px var(--font);color:var(--fg3);min-width:52px;text-align:center;font-variant-numeric:tabular-nums}
.vbody{display:grid;grid-template-columns:300px 1fr;min-height:0}
.viewer.nosb .vbody{grid-template-columns:0 1fr}
.sb{overflow:auto;border-right:1px solid var(--sep);background:var(--glass);padding:12px 10px 30px;min-width:0}
.sb .seg{display:grid;margin:0 6px 8px}
.sb h4{margin:18px 10px 4px;font-size:11px;font-weight:600;color:var(--fg3);text-transform:uppercase;letter-spacing:.04em;display:flex;align-items:center;gap:7px}
.sb h4 i{width:7px;height:7px;border-radius:50%}
.sbi{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:0;background:none;padding:7px 10px;border-radius:8px;font-size:13.5px;line-height:1.3;color:var(--fg)}
.sbi:hover{background:var(--fill2)}
.sbi.on{background:var(--blue);color:#fff}
.sbi.on small{color:rgba(255,255,255,.75)}
.sbi .t{flex:1;min-width:0}
.sbi small{display:block;color:var(--fg2);font-size:11.5px}
.sbi .n{font:500 11px var(--font);color:var(--fg3);width:16px}
.sbi.on .n{color:rgba(255,255,255,.7)}
.stage{position:relative;min-width:0;min-height:0}
.stage iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#fff}
.stage img.full{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;padding:20px}
.stage pre.txt{position:absolute;inset:0;margin:0;overflow:auto;padding:40px max(24px,calc(50% - 380px));font:14px/1.6 var(--mono);white-space:pre-wrap;letter-spacing:0}
.doc{position:absolute;inset:0;overflow:auto}
.notice{position:absolute;inset:0;display:grid;place-items:center;padding:24px;text-align:center;color:var(--fg2)}
.notice b{display:block;color:var(--fg);font-size:21px;margin-bottom:6px}
.notice .btn{margin-top:18px}
.spinner{position:absolute;inset:0;display:grid;place-items:center}
.spinner::before{content:"";width:22px;height:22px;border-radius:50%;border:2.5px solid var(--fill);border-top-color:var(--fg2);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.menu{position:absolute;right:12px;top:56px;background:var(--card);border-radius:14px;box-shadow:0 12px 40px rgba(0,0,0,.2);padding:6px;min-width:200px;z-index:10}
.menu button{display:flex;width:100%;border:0;background:none;text-align:left;padding:9px 12px;border-radius:9px;font-size:15px;color:var(--fg)}
.menu button:hover{background:var(--fill2)}
.menu button.danger{color:var(--red)}
.md{max-width:760px;margin:0 auto;padding:56px 28px 100px;font-size:17px;line-height:1.6}
.md h1{font-size:40px;line-height:1.1;letter-spacing:-.035em;margin:0 0 28px}
.md h2{font-size:28px;letter-spacing:-.03em;margin:52px 0 14px;line-height:1.2}
.md h3{font-size:21px;margin:32px 0 10px}
.md code{font:14px var(--mono);background:var(--fill2);padding:.12em .4em;border-radius:6px;letter-spacing:0}
.md pre{background:var(--code);border-radius:14px;padding:16px 18px;overflow:auto;line-height:1.55;border:1px solid var(--sep)}
.md pre code,.md pre code.hljs{background:none;padding:0;font-size:13.5px}
.md table{border-collapse:collapse;width:100%;font-size:15px;display:block;overflow:auto}
.md th,.md td{border-bottom:1px solid var(--sep);padding:8px 12px;text-align:left}
.md blockquote{margin:20px 0;padding:14px 18px;background:var(--card);border-radius:14px;box-shadow:var(--shadow)}
.md .katex-display{overflow-x:auto;overflow-y:hidden}
.scrim{display:none}

/* ---------- login ---------- */
.login{min-height:100dvh;display:grid;place-items:center;padding:24px}
.login-card{width:min(400px,100%);text-align:center}
.login-card .logo-big{width:72px;height:72px;border-radius:18px;background:linear-gradient(135deg,#0a84ff,#bf5af2);display:grid;place-items:center;color:#fff;font:700 26px var(--font);margin:0 auto 22px;box-shadow:0 12px 30px rgba(94,92,230,.35)}
.login-card h1{margin:0;font-size:34px;letter-spacing:-.035em}
.login-card>p{margin:6px 0 28px;color:var(--fg2)}
.login-card form{display:grid;gap:10px;text-align:left}
.gbtn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;border:1px solid var(--sep);background:var(--card);color:var(--fg);border-radius:12px;padding:12px;font-size:16px;font-weight:500}
.gbtn:hover{background:var(--fill2)}
.or{display:flex;align-items:center;gap:12px;color:var(--fg3);font-size:13px;margin:18px 0}
.or::before,.or::after{content:"";flex:1;border-top:1px solid var(--sep)}

/* ---------- toast ---------- */
.toast{position:fixed;left:50%;bottom:calc(24px + var(--tabbar) + env(safe-area-inset-bottom));transform:translate(-50%,20px);background:rgba(29,29,31,.92);color:#fff;padding:11px 18px;border-radius:980px;font-size:15px;opacity:0;transition:.3s;z-index:100;pointer-events:none;max-width:calc(100% - 32px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:760px){
  .page{padding-top:24px}
  .ptitle h1{font-size:32px}
  .chooser,.grid{grid-template-columns:1fr}
  .tile{min-height:190px;padding:24px}
  .tile .num{font-size:64px}
  .tile h2{font-size:28px}
  .tile .go{top:22px;right:22px}
  .controls{flex-direction:column;align-items:stretch}
  .seg{display:grid}
  .searchbox{width:100%}
  .vbody,.viewer.nosb .vbody{grid-template-columns:1fr}
  .sb{position:fixed;top:calc(52px + env(safe-area-inset-top));bottom:0;left:0;width:min(320px,86vw);z-index:5;transform:translateX(-105%);transition:transform .3s cubic-bezier(.2,.8,.2,1);background:var(--bg)}
  .viewer.sbm .sb{transform:none;box-shadow:0 0 40px rgba(0,0,0,.25)}
  .viewer.sbm .scrim{display:block;position:fixed;inset:52px 0 0;background:rgba(0,0,0,.3);z-index:4}
  .vbar{grid-template-columns:auto 1fr auto;gap:6px;padding:0 6px}
  .vtitle{max-width:none}
  .hide-sm{display:none!important}
  .back span{display:none}
  .md{padding:32px 18px 80px;font-size:16px}
  .sheet-wrap{padding:0;align-items:end}
  .sheet{border-radius:22px 22px 0 0;max-height:94dvh}
  .drow{padding:12px 14px;gap:12px}
  .dday{width:42px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- ссылки и контакты курса ---------- */
.slinks{padding:0 22px 10px;display:grid;gap:10px}
.schips{display:flex;flex-wrap:wrap;gap:6px}
.schip{display:inline-flex;align-items:center;gap:6px;background:var(--fill2);color:var(--fg);border-radius:980px;padding:6px 12px;font-size:13px;font-weight:500;letter-spacing:-.01em}
.schip:hover{background:var(--fill)}
.schip svg{color:var(--fg2)}
.people{font-size:13.5px}
.people summary{cursor:pointer;color:var(--link);list-style:none;font-weight:500}
.people summary::-webkit-details-marker{display:none}
.people summary::after{content:" ›";display:inline-block;transition:transform .2s}
.people[open] summary::after{transform:rotate(90deg)}
.person{display:grid;grid-template-columns:150px 1fr;gap:2px 12px;padding:7px 0;border-bottom:1px solid var(--sep);align-items:baseline}
.person:last-child{border-bottom:0}
.person span{color:var(--fg2)}
.person b{font-weight:500}
.person small{grid-column:2;color:var(--fg3);font-size:12px}
@media (max-width:760px){.person{grid-template-columns:1fr}.person small{grid-column:1}}

/* этап «только wiki»: кнопки загрузки скрыты */
.no-uploads [data-upload]{display:none!important}

/* ---------- папка группы на Drive ---------- */
.drivebox{display:flex;align-items:center;gap:16px;background:var(--card);border-radius:20px;padding:16px 18px;box-shadow:var(--shadow);margin-bottom:18px}
.drivebox.compact{margin:0;box-shadow:none;background:var(--fill2);width:100%}
.drivebox .dicon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,#34a853,#1a73e8);flex:none}
.drivebox .dtext{flex:1;min-width:0;line-height:1.35}
.drivebox .dtext b{display:block;font-size:16px;font-weight:600}
.drivebox .dtext small{display:block;color:var(--fg2);font-size:13px;margin-top:3px}
@media (max-width:760px){.drivebox{flex-wrap:wrap}.drivebox .btn{width:100%}}