/* Layout: sticky header + one view at a time; pages are A4 sheets on a cool "lab paper" ground, cobalt like a doctor's stamp */
:root{
  --paper:#FFFFFF; --surface:#FFFFFF; --tint:#F2F5F4; --desk:#DCE3E2; --ink:#13242A; --muted:#52636A; --line:#D3DCDB; --line-strong:#A9B8B7;
  --accent:#2340C8; --accent-ink:#FFFFFF; --accent-soft:#E5E9FB;
  --free:#1C7651; --free-soft:#DFF1E7; --lock:#8A5A12; --lock-soft:#F6ECDA;
  --sheet:#FFFFFF; --sheet-ink:#1A2A30; --sheet-line:#E1E6E5; --shadow:0 1px 2px rgba(19,36,42,.06),0 8px 24px rgba(19,36,42,.08); --shadow-sm:0 1px 2px rgba(19,36,42,.05),0 2px 10px rgba(19,36,42,.05);
  --ease:cubic-bezier(.2,.7,.2,1);
  --f-display:"Unbounded","Golos Text",system-ui,sans-serif;
  --f-body:"Golos Text",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --r:10px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#0E1618; --surface:#152125; --tint:#1A282C; --desk:#070D0F; --ink:#E4ECEA; --muted:#93A3A5; --line:#29383C; --line-strong:#4A5E63;
  --accent:#8196FF; --accent-ink:#0E1618; --accent-soft:#1D2753;
  --free:#62C99D; --free-soft:#153226; --lock:#E2B66A; --lock-soft:#3A2D16;
  --sheet:#E3E8E6; --sheet-ink:#15222A; --sheet-line:#C9D1CF; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px rgba(0,0,0,.35); --shadow-sm:0 1px 2px rgba(0,0,0,.25);
  color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0E1618; --surface:#152125; --tint:#1A282C; --desk:#070D0F; --ink:#E4ECEA; --muted:#93A3A5; --line:#29383C; --line-strong:#4A5E63;
  --accent:#8196FF; --accent-ink:#0E1618; --accent-soft:#1D2753;
  --free:#62C99D; --free-soft:#153226; --lock:#E2B66A; --lock-soft:#3A2D16;
  --sheet:#E3E8E6; --sheet-ink:#15222A; --sheet-line:#C9D1CF; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px rgba(0,0,0,.35); --shadow-sm:0 1px 2px rgba(0,0,0,.25);
  color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--surface)}
h1,h2,h3{font-family:var(--f-display);font-weight:600;line-height:1.15;text-wrap:balance;margin:0;letter-spacing:-.01em}
p{margin:0}
a{color:inherit}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.wrap{max-width:1180px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.eyebrow{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--surface);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:24px;height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--f-display);font-weight:600;font-size:17px;white-space:nowrap}
.logo .rp{display:grid;place-items:center;width:34px;height:34px;border:2px solid var(--accent);border-radius:50%;color:var(--accent);font-family:var(--f-mono);font-size:12px;font-weight:500;transform:rotate(-8deg)}
.nav{display:flex;gap:4px;flex:1}
.nav a{text-decoration:none;padding:8px 12px;border-radius:8px;color:var(--muted);font-weight:500}
.nav a:hover{color:var(--ink);background:var(--tint)}
.nav a[aria-current="page"]{color:var(--ink);background:var(--accent-soft)}
.who{display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:600;font-size:14px;border:0}
.badge{font-size:12px;font-weight:500;padding:3px 9px;border-radius:99px;white-space:nowrap}
.badge.sub{background:var(--accent-soft);color:var(--accent)}
.badge.free{background:var(--free-soft);color:var(--free)}
.badge.lock{background:var(--lock-soft);color:var(--lock)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:6px 10px}
@media (max-width:760px){
  .nav{position:absolute;left:0;right:0;top:64px;background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;padding:8px max(16px,env(safe-area-inset-right,0px)) 12px max(16px,env(safe-area-inset-left,0px));display:none}
  .nav.open{display:flex}
  .menu-btn{display:block;margin-left:auto}
  .who .badge,.who .btn.primary{display:none}
  .top .wrap{gap:12px}
  .logo{font-size:15px}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--r);padding:11px 18px;font-weight:500;border:1px solid transparent;text-decoration:none;white-space:nowrap;transition:background .15s,border-color .15s}
.btn.primary{background:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{background:color-mix(in srgb,var(--accent) 88%,var(--ink))}
.btn.ghost{background:var(--surface);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--ink)}
.btn.sm{padding:7px 12px;font-size:14px}
.btn.block{width:100%}

main{padding-block:0 64px}
section.view{animation:fade .2s ease}
@keyframes fade{from{opacity:.4}to{opacity:1}}
@media (prefers-reduced-motion:reduce){section.view{animation:none}*{transition:none!important}}

/* ---------- home ---------- */
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding-block:56px 48px}
.hero h1{font-size:clamp(30px,4.6vw,52px);margin-block:14px 18px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lead{font-size:18px;color:var(--muted);max-width:34em}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hero .note{margin-top:16px;font-size:14px;color:var(--muted)}
.stack{position:relative;height:420px;max-width:100%}
.stack .sheet{position:absolute;width:300px;aspect-ratio:612/792;max-width:80%}
.stack .s1{left:8%;top:30px;transform:rotate(-5deg);opacity:.55}
.stack .s2{left:20%;top:10px;transform:rotate(2deg)}
.stack .tag{position:absolute;right:4%;bottom:40px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);font-size:14px;display:grid;gap:2px}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr;padding-block:36px}.stack{height:340px}.stack .sheet{width:240px}}

.facts{border-block:1px solid var(--line);background:var(--surface)}
.facts .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding-block:24px}
.facts b{display:block;font-family:var(--f-display);font-size:28px;font-weight:600}
.facts span{color:var(--muted);font-size:14px}
@media (max-width:700px){.facts .wrap{grid-template-columns:repeat(2,1fr)}}

div.block{padding-block:64px 0}
.block-head{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.block-head h2{font-size:clamp(22px,2.6vw,30px)}
.block-head p{color:var(--muted);max-width:40em;margin-top:8px}

.sections{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.sections a{text-decoration:none;color:inherit;cursor:pointer;background:var(--surface);padding:20px;display:grid;grid-template-columns:auto 1fr auto;gap:4px 14px;align-items:baseline}
.sections a:hover{background:var(--accent-soft)}
.sections a:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.sections .code{grid-row:span 2;font-family:var(--f-mono);font-size:13px;color:var(--accent);min-width:3.2em}
.sections .name{font-weight:600}
.sections .count{font-family:var(--f-mono);font-size:13px;color:var(--muted)}
.sections .ex{grid-column:2/4;font-size:14px;color:var(--muted)}
@media (max-width:900px){.sections{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.sections{grid-template-columns:1fr}}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{border-top:2px solid var(--ink);padding-top:16px;display:grid;gap:8px}
.step .n{font-family:var(--f-mono);font-size:13px;color:var(--accent)}
.step h3{font-size:18px}
.step p{color:var(--muted)}
@media (max-width:760px){.steps{grid-template-columns:1fr}}

.author{display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px}
.author .ph{width:96px;height:96px;border-radius:50%;background:var(--accent-soft);display:grid;place-items:center;color:var(--accent);font-family:var(--f-display);font-size:28px}
.author blockquote{margin:0 0 12px;font-size:19px;line-height:1.5;max-width:40em}
.author .sig{color:var(--muted);font-size:14px}
@media (max-width:600px){.author{grid-template-columns:1fr}}

.faq{display:grid;grid-template-columns:1fr 1fr;gap:12px 32px}
.faq details{border-bottom:1px solid var(--line);padding-block:14px}
.faq summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";font-family:var(--f-mono);color:var(--accent)}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);margin-top:8px}
@media (max-width:760px){.faq{grid-template-columns:1fr}}

footer{border-top:1px solid var(--line);margin-top:64px;color:var(--muted);font-size:14px}
footer .wrap{display:grid;gap:12px;padding-block:24px}
.foot-main{display:flex;justify-content:space-between;gap:8px 16px;flex-wrap:wrap}
.foot-links{display:flex;gap:8px 20px;flex-wrap:wrap}
.foot-links a{color:var(--ink);text-decoration:none}
.foot-links a:hover{text-decoration:underline}
.foot-disc{font-size:13px;max-width:60em}
.doc .doc-toc,.doc .doc-note,.doc .table-wrap{max-width:860px}
.doc h2{font-size:20px;margin:36px 0 12px;scroll-margin-top:calc(90px + env(safe-area-inset-top,0px))}
.doc h3{font-family:var(--f-body);font-size:16px;font-weight:600;margin:16px 0 6px}
.doc p,.doc li{max-width:68ch;margin:0 0 8px}
.doc ul{padding-left:1.2em;margin:0 0 8px}
.doc a{color:var(--accent)}
.doc .table-wrap{margin:8px 0 12px}
.doc-date{font-size:14px}
.doc-note{background:var(--lock-soft);color:var(--ink);border-radius:12px;padding:12px 16px;font-size:14px;margin-bottom:20px}
.doc-toc{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:6px 20px;padding:16px 20px;background:var(--surface);border:1px solid var(--line);border-radius:12px;font-size:14px}
.doc-toc a{color:var(--ink);text-decoration:none}
.doc-toc a:hover{color:var(--accent)}
.doc-kv{max-width:560px}
.cookie-bar{position:fixed;left:0;right:0;bottom:0;z-index:40;background:var(--surface);border-top:1px solid var(--line);box-shadow:var(--shadow);padding:14px max(16px,env(safe-area-inset-right,0px)) calc(14px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
.cb-in{max-width:1180px;margin:0 auto;display:flex;gap:12px 24px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.cb-in p{font-size:14px;max-width:70ch;flex:1 1 320px}
.cb-in a{color:var(--accent)}
.cb-btns{display:flex;gap:8px;flex-wrap:wrap}
.ck-row{display:grid;grid-template-columns:1fr auto;gap:4px 12px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}
.ck-row small{color:var(--muted);grid-column:1/2}
.check a{color:var(--accent)}

/* ---------- pricing ---------- */
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;align-items:stretch}
.plan{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:14px;position:relative}
.plan.best{border:2px solid var(--accent)}
.plan .flag{position:absolute;top:-12px;left:24px;background:var(--accent);color:var(--accent-ink);font-size:12px;font-weight:600;padding:3px 10px;border-radius:99px}
.plan h3{font-family:var(--f-body);font-size:16px;font-weight:600}
.plan .price{font-family:var(--f-display);font-size:32px;font-weight:600;font-variant-numeric:tabular-nums}
.plan .price small{font-family:var(--f-body);font-size:15px;font-weight:400;color:var(--muted)}
.plan .per{font-size:14px;color:var(--muted);min-height:1.5em}
.plan ul{margin:0;padding:0;list-style:none;display:grid;gap:8px;font-size:15px;flex:1}
.plan li{display:flex;gap:8px}
.plan li::before{content:"";flex:none;width:14px;height:14px;margin-top:5px;border-radius:50%;border:2px solid var(--free)}
.plan li.no{color:var(--muted)}
.plan li.no::before{border-color:var(--line)}
@media (max-width:1000px){.plans{grid-template-columns:repeat(2,1fr);row-gap:28px}}
@media (max-width:560px){.plans{grid-template-columns:1fr}}
.compare{margin-top:40px;overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.compare table{width:100%;border-collapse:collapse;min-width:560px;font-size:15px}
.compare th,.compare td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
.compare tr:last-child td{border-bottom:0}
.compare th{font-weight:600;font-size:13px;color:var(--muted)}
.compare td.c{font-family:var(--f-mono);text-align:center}
.compare th.c{text-align:center}
.small-note{margin-top:16px;font-size:14px;color:var(--muted)}

/* ---------- catalog ---------- */
.cat-head{padding-block:36px 20px;display:grid;gap:16px}
.cat-head h1{font-size:clamp(26px,3.4vw,38px)}
.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.search{flex:1;min-width:220px;position:relative}
.search input{width:100%;padding:12px 14px 12px 40px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);color:var(--ink);font:inherit}
.search svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--muted)}
select{padding:11px 12px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);color:var(--ink);font:inherit}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--surface);padding:6px 12px;border-radius:99px;font-size:14px;display:inline-flex;gap:6px;align-items:center}
.chip .c{font-family:var(--f-mono);font-size:12px;color:var(--muted)}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.chip[aria-pressed="true"] .c{color:inherit;opacity:.7}
.count-line{font-size:14px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
a.card{text-decoration:none;color:inherit}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:10px;cursor:pointer;text-align:left;transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--accent);transform:translateY(-1px)}
.card .meta{display:flex;justify-content:space-between;gap:8px;font-family:var(--f-mono);font-size:12px;color:var(--muted)}
.card h3{font-family:var(--f-body);font-size:17px;font-weight:600;line-height:1.3;min-height:2.6em}
.card .hit{font-size:13px;color:var(--muted);margin-top:-4px}
.card .hit b{color:var(--accent);font-weight:600}
.card .foot{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;font-size:13px;color:var(--muted)}
.prog{height:4px;border-radius:2px;background:var(--line);overflow:hidden}
.prog i{display:block;height:100%;background:var(--accent)}
.empty{padding:48px 16px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:14px}
.more{display:flex;justify-content:center;margin-top:24px}

/* ---------- viewer ---------- */
.viewer{display:grid;grid-template-columns:200px 1fr;gap:28px;padding-block:24px}
.viewer.norail{grid-template-columns:1fr}
.viewer.reading{position:fixed;inset:0;z-index:45;max-width:none;margin:0;background:var(--paper);grid-template-columns:1fr;gap:12px;align-content:start;overflow:auto;padding-block:calc(12px + env(safe-area-inset-top,0px)) calc(16px + env(safe-area-inset-bottom,0px))}
.viewer.reading .thumbs,.viewer.reading .vnote,.viewer.reading #railBtn,.viewer.reading a.iconbtn{display:none}
.viewer.reading .vbar{position:sticky;top:0;z-index:2;background:var(--paper);padding-block:4px}
.viewer.reading .stage .sheet{width:calc(min(100%, (100vh - 96px) * 612 / 792) * var(--z,1))}
.viewer.reading #fsBtn{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}
body.reading-lock{overflow:hidden}
.viewer.norail .thumbs{display:none}
.zl{font-family:var(--f-mono);font-size:13px;min-width:3.6em;text-align:center;color:var(--muted)}
.iconbtn[aria-pressed="true"]{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}
#sheetHost{overflow-x:auto;padding-bottom:4px}
.vbar{grid-column:1/-1;display:flex;gap:12px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.vbar .t{display:grid;gap:2px;min-width:0}
.vbar .t b{font-size:18px;line-height:1.3}
.vbar .ctrl{display:flex;gap:8px;align-items:center}
@media (min-width:561px){.vbar{flex-wrap:nowrap}.vbar>.ctrl:first-child{flex:1 1 auto}.vbar>.ctrl:last-child{flex:none}}
.iconbtn{width:38px;height:38px;border-radius:9px;border:1px solid var(--line);background:var(--surface);display:grid;place-items:center}
.iconbtn:disabled{opacity:.4;cursor:default}
.pg{font-family:var(--f-mono);font-size:14px;min-width:7.5em;text-align:center}
.thumbs{display:grid;gap:10px;align-content:start;max-height:calc(100vh - 180px);overflow:auto;padding:4px 6px 4px 2px;position:sticky;top:calc(80px + env(safe-area-inset-top,0px))}
.thumb{all:unset;cursor:pointer;display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:center;font-size:13px;color:var(--muted);padding:4px;border-radius:8px}
.thumb .mini{width:46px;aspect-ratio:612/792;background:#FFFFFF;border:1px solid var(--line);border-radius:3px;display:grid;place-items:center;color:var(--lock)}
.thumb[aria-current="true"]{color:var(--ink);font-weight:600}
.thumb[aria-current="true"] .mini{outline:2px solid var(--accent)}
.thumb:focus-visible{outline:2px solid var(--accent)}
.stage{display:grid;justify-items:center;gap:16px;min-width:0}
.sheet{background:#FFFFFF;color:var(--sheet-ink);box-shadow:var(--shadow);border-radius:3px;aspect-ratio:612/792;width:100%;max-width:100%;position:relative;overflow:hidden;font-size:var(--fs,15px);user-select:none;-webkit-user-select:none}
.stage .sheet{width:calc(min(100%,760px) * var(--z,1));max-width:none;margin-inline:auto}
.pimg{display:block;width:100%;height:100%;object-fit:cover;pointer-events:none}
.pimg.blur{filter:blur(6px);transform:scale(1.04);opacity:.8}
.card .cover{margin:-18px -18px 4px;height:120px;overflow:hidden;border-bottom:1px solid var(--line);border-radius:14px 14px 0 0;background:#FFFFFF}
.card .cover img{width:100%;display:block;transform:translateY(-6%)}
.thumb .mini{overflow:hidden}
.thumb .mini img{width:100%;height:100%;object-fit:cover;display:block}
.sheet .in{position:absolute;inset:0;padding:7% 8%;display:flex;flex-direction:column;gap:1em}
.sheet .run{display:flex;justify-content:space-between;font-family:var(--f-mono);font-size:.68em;color:#5C6C70;border-bottom:1px solid var(--sheet-line);padding-bottom:.6em}
.sheet .foot{margin-top:auto;display:flex;justify-content:space-between;font-family:var(--f-mono);font-size:.68em;color:#5C6C70;border-top:1px solid var(--sheet-line);padding-top:.6em}
.sheet h2{font-family:var(--f-display);font-size:1.45em;color:var(--sheet-ink)}
.sheet h4{margin:0;font-size:1em;font-weight:600}
.sheet p,.sheet li{font-size:.9em;line-height:1.5}
.sheet ul{margin:0;padding-left:1.2em;display:grid;gap:.2em}
.sheet .box{border:1.5px solid #2340C8;border-radius:6px;padding:.7em .9em;font-size:.88em;background:#EEF1FD}
.sheet .box b{color:#2340C8}
.sheet table{width:100%;border-collapse:collapse;font-size:.78em}
.sheet th,.sheet td{border:1px solid #C7D0CE;padding:.4em .5em;text-align:left}
.sheet th{background:#EDF1F0}
.sheet .cover-num{font-family:var(--f-mono);font-size:3.2em;color:#2340C8;line-height:1}
.sheet .toc{display:grid;gap:.35em;font-size:.9em}
.sheet .toc div{display:flex;gap:.5em}
.sheet .toc div span:nth-child(2){flex:1;border-bottom:1px dotted #9AA7A5;transform:translateY(-.35em)}
.sheet .toc .lk{color:#8A8F8E}
.sheet .tree{display:grid;grid-template-columns:1fr 1fr;gap:.8em}
.sheet .tree>div{border:1px solid #C7D0CE;border-radius:6px;padding:.7em}
.sheet .sk{display:grid;gap:.55em}
.sheet .sk i{display:block;height:.62em;border-radius:3px;background:#D7DEDC}
.sheet .wm{position:absolute;inset:0;display:grid;place-items:center;pointer-events:none;font-family:var(--f-mono);font-size:1em;color:rgba(35,64,200,.09);transform:rotate(-30deg);white-space:nowrap;line-height:2.4;text-align:center}
.paywall{position:absolute;inset:0;display:grid;place-items:center;padding:16px;background:linear-gradient(to bottom,transparent,color-mix(in srgb,var(--sheet) 70%,transparent) 30%)}
.paywall .card2{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:24px;max-width:380px;display:grid;gap:12px;text-align:center;font-size:15px;user-select:text}
.paywall h3{font-size:19px}
.paywall p{color:var(--muted)}
.vnote{font-size:13px;color:var(--muted);text-align:center;max-width:42em}
@media (max-width:900px){.viewer{grid-template-columns:1fr}.thumbs{display:none}#railBtn{display:none}.sheet{font-size:clamp(8px,2.3vw,15px)}}

/* ---------- account ---------- */
.acc{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding-block:8px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;display:grid;gap:14px;align-content:start;min-width:0}
.panel h3{font-family:var(--f-body);font-size:16px;font-weight:600;display:flex;justify-content:space-between;gap:8px;align-items:center}
.panel.wide{grid-column:1/-1}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;font-size:15px}
.kv dt{color:var(--muted)}
.kv dd{margin:0}
.rowlist{display:grid}
.rowlist>div{display:grid;grid-template-columns:1fr auto;gap:4px 12px;align-items:center;padding-block:12px;border-top:1px solid var(--line)}
.rowlist>div:first-child{border-top:0;padding-top:0}
.rowlist small{color:var(--muted);font-size:13px}
.rowlist .prog{grid-column:1/-1}
.linkbtn{background:none;border:0;padding:0;color:var(--accent);font-weight:500}
.table-wrap{overflow-x:auto}
.table-wrap table{width:100%;border-collapse:collapse;font-size:14px;min-width:460px}
.table-wrap td,.table-wrap th{padding:10px 8px;border-bottom:1px solid var(--line);text-align:left}
.table-wrap th{color:var(--muted);font-weight:500;font-size:13px}
@media (max-width:760px){.acc{grid-template-columns:1fr}}

/* ---------- modal & toast ---------- */
.modal{position:fixed;inset:0;z-index:50;background:rgba(10,20,24,.5);display:grid;place-items:center;padding:16px max(16px,env(safe-area-inset-right,0px)) 16px max(16px,env(safe-area-inset-left,0px))}
.dialog{background:var(--surface);color:var(--ink);border-radius:18px;padding:28px;width:min(440px,100%);display:grid;gap:16px;box-shadow:var(--shadow);max-height:90vh;overflow:auto}
.dialog h2{font-size:22px}
.dialog p{color:var(--muted);font-size:15px}
.field{display:grid;gap:6px;font-size:14px;font-weight:500}
.field input{padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);color:var(--ink);font:inherit;font-weight:400}
.check{display:flex;gap:10px;font-size:14px;color:var(--muted);align-items:flex-start}
.check input{margin-top:4px}
.sum{display:flex;justify-content:space-between;padding:14px 16px;background:var(--tint);border-radius:var(--r);font-weight:500}
.sum .mono{font-weight:500}
.pay-box{border:1px dashed var(--line);border-radius:12px;padding:18px;display:grid;gap:8px;text-align:center;color:var(--muted);font-size:14px}
.dialog .x{justify-self:end;margin:-12px -12px -8px 0;background:none;border:0;font-size:22px;line-height:1;color:var(--muted);padding:6px}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:12px 18px;border-radius:12px;font-size:15px;z-index:60;box-shadow:var(--shadow);max-width:calc(100% - 32px)}
.page-head{padding-block:36px 24px;display:grid;gap:10px}
.page-head h1{font-size:clamp(26px,3.4vw,38px)}
.page-head p{color:var(--muted);max-width:42em}

/* ---------- forms, notices, admin ---------- */
.auth{max-width:460px;margin:48px auto 0;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:28px;display:grid;gap:16px;box-shadow:var(--shadow)}
.auth h1{font-size:24px}
.auth p{color:var(--muted);font-size:15px}
.auth form{display:grid;gap:14px}
.field input,.field select,.field textarea{padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);color:var(--ink);font:inherit;font-weight:400;width:100%}
.err{background:var(--lock-soft);color:var(--ink);border-radius:var(--r);padding:10px 14px;font-size:14px}
.ok{background:var(--free-soft);color:var(--ink);border-radius:var(--r);padding:10px 14px;font-size:14px}
.inline{display:inline}
.muted{color:var(--muted)}
.code-input{font-family:var(--f-mono);font-size:22px;letter-spacing:.3em;text-align:center}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stats div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px}
.stats b{display:block;font-family:var(--f-display);font-size:24px}
.stats span{color:var(--muted);font-size:14px}
@media (max-width:700px){.stats{grid-template-columns:repeat(2,1fr)}}
.admin-g{display:grid;grid-template-columns:2.2fr 1.6fr auto auto auto;gap:8px;align-items:center;padding:8px 0;border-top:1px solid var(--line)}
.admin-g input[type=text],.admin-g select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);font:inherit;font-size:14px}
.admin-g label{font-size:13px;color:var(--muted);display:flex;gap:4px;align-items:center;white-space:nowrap}
@media (max-width:860px){.admin-g{grid-template-columns:1fr 1fr}}
.paywall .card2 form{display:grid}
.stack .sheet{background:#fff;box-shadow:var(--shadow);border-radius:3px}
@media (max-width:560px){.vbar .ctrl{gap:4px}.vbar .iconbtn{width:34px;height:34px}.pg{min-width:4.6em}}
@media (max-width:420px){.zl{display:none}}

/* ---------- flashcards ---------- */
.fc-modes{display:inline-flex;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px;flex-wrap:wrap}
.fc-modes button{border:0;background:none;padding:8px 14px;border-radius:9px;font-weight:500;color:var(--muted)}
.fc-modes button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.fc-sec-h{display:flex;align-items:baseline;gap:10px;margin:28px 0 12px}
.fc-sec-h h2{font-size:19px}
.fc-sec-h .mono{font-size:13px;color:var(--accent)}
.fc-decks{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.fc-deck{all:unset;cursor:pointer;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 16px 14px 22px;display:flex;flex-direction:column;gap:8px;overflow:hidden;transition:border-color .15s,transform .15s}
.fc-deck::before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:var(--d)}
.fc-deck:hover{border-color:var(--d);transform:translateY(-1px)}
.fc-deck:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.fc-deck .meta{display:flex;justify-content:space-between;gap:8px;font-family:var(--f-mono);font-size:12px;color:var(--muted)}
.fc-deck h3{font-family:var(--f-body);font-size:17px;font-weight:600;line-height:1.3}
.fc-deck .sub{font-size:13px;color:var(--muted);line-height:1.4}
.fc-deck .foot{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;padding-top:4px}
.fc-dots{display:flex;gap:5px;flex-wrap:wrap;align-items:center}
.fc-dots i{width:10px;height:10px;border-radius:50%;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08)}
.fc-study{max-width:1040px;margin:0 auto;display:grid;gap:12px;scroll-margin-top:calc(76px + env(safe-area-inset-top,0px))}
.fc-bar{display:flex;align-items:center;gap:10px}
.fc-bar .t{flex:1;min-width:0;display:grid;gap:2px}
.fc-bar .t b{font-size:17px;line-height:1.25}
.fc-bar .t span{font-family:var(--f-mono);font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fc-count{font-family:var(--f-mono);font-size:14px;color:var(--muted);white-space:nowrap}
.fc-wrap{height:clamp(460px,calc(100vh - 250px),900px);height:clamp(460px,calc(100dvh - 250px),900px);perspective:1800px;scroll-margin-top:calc(76px + env(safe-area-inset-top,0px))}
.fc-bbody{overflow-x:hidden}.fc-row{display:grid;gap:0 28px;min-width:0}.fc-row>*{min-width:0}
@media (min-width:760px){.fc-bbody{padding:18px 26px 24px}.fc-row.r2{grid-template-columns:1fr 1fr}.fc-row.r3{grid-template-columns:repeat(3,1fr)}.fc-bhead{padding:16px 26px 12px}.fc-bhead b{font-size:20px}}
.fc-flip{position:relative;height:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.2,.7,.2,1);cursor:pointer}
.fc-flip.flipped{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:20px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.fc-flip:not(.flipped) .fc-back{pointer-events:none}
.fc-flip.flipped .fc-front{pointer-events:none}
.fc-front{background:linear-gradient(150deg,var(--cat),color-mix(in srgb,var(--cat) 72%,#101522));color:#fff;align-items:center;justify-content:center;text-align:center;padding:30px 26px}
.fc-front.neutral{background:linear-gradient(150deg,#2C3A40,#13242A)}
.fc-front .top{position:absolute;top:18px;left:0;right:0;padding:0 18px;font-size:12px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:rgba(255,255,255,.78);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fc-front .name{font-family:var(--f-display);font-size:clamp(24px,6vw,40px);font-weight:600;line-height:1.12;max-width:24ch;overflow-wrap:anywhere;hyphens:auto}
.fc-front .name small{display:block;font-family:var(--f-body);font-size:.6em;font-weight:500;opacity:.9;margin-top:.4em}
.fc-front .hint{position:absolute;bottom:16px;left:0;right:0;font-size:13px;color:rgba(255,255,255,.7)}
.fc-back{background:#fff;color:#1A2A30;transform:rotateY(180deg)}
.fc-bhead{flex:none;padding:14px 20px 10px;border-bottom:1px solid #E1E6E5;display:flex;align-items:center;gap:11px}
.fc-chip{width:14px;height:14px;border-radius:5px;background:var(--cat);flex:none}
.fc-bhead b{display:block;font-size:17px;line-height:1.2}
.fc-bhead span{font-size:12px;color:#5C6C70}
.fc-bbody{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:14px 20px 22px}
.fc-sec{margin-bottom:15px}
.fc-lab{font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--cat);margin-bottom:6px}
.fc-pts{list-style:none;margin:0;padding:0;display:grid;gap:5px}
.fc-pts li{position:relative;padding-left:16px;font-size:14.5px;line-height:1.42}
.fc-pts li::before{content:"";position:absolute;left:3px;top:8px;width:5px;height:5px;border-radius:50%;background:var(--cat);opacity:.7}
.fc-mech .step{position:relative;font-size:14px;line-height:1.38;background:#F4F6F6;border:1px solid #E1E6E5;border-left:3px solid var(--cat);border-radius:9px;padding:8px 11px;margin-bottom:16px}
.fc-mech .step:last-child{margin-bottom:0}
.fc-mech .step::after{content:"↓";position:absolute;left:50%;transform:translateX(-50%);bottom:-15px;font-size:13px;color:var(--cat);font-weight:700;line-height:1}
.fc-mech .step:last-child::after{display:none}
.fc-rem{margin-top:6px;background:color-mix(in srgb,var(--cat) 9%,#fff);border:1px solid color-mix(in srgb,var(--cat) 26%,#fff);border-radius:13px;padding:12px 14px;font-size:14.5px;line-height:1.45}
.fc-rem b:first-child{color:var(--cat)}
.fc-src{margin-top:14px;font-size:13px;color:#5C6C70}
.fc-src a{color:#2340C8}
.fc-lock{position:absolute;inset:0;display:grid;place-items:center;padding:16px;background:#fff}
.fc-lock .card2{border:1px solid #D6DEDD;border-radius:16px;padding:22px;max-width:360px;display:grid;gap:10px;text-align:center;font-size:15px;color:#13242A}
.fc-lock .card2 p{color:#56676C}
.fc-ctrl{display:flex;gap:8px;align-items:stretch}
.fc-ctrl .iconbtn{width:52px;height:auto;min-height:48px;border-radius:12px}
.fc-ctrl .btn{flex:1}
.fc-ctrl .iconbtn.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.fc-prog{height:4px;border-radius:2px;background:var(--line);overflow:hidden}
.fc-prog i{display:block;height:100%;background:var(--accent);transition:width .3s}
.fc-note{font-size:13px;color:var(--muted);text-align:center}
.fc-q{display:grid;gap:10px}
.fc-q h3{font-family:var(--f-body);font-size:16px;font-weight:600}
.fc-opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.fc-opt{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:12px 14px;text-align:left;display:flex;gap:10px;align-items:baseline;font-size:15px;line-height:1.3}
.fc-opt .mono{font-size:12px;color:var(--accent);flex:none;min-width:2.8em}
.fc-opt:hover:not(:disabled){border-color:var(--accent)}
.fc-opt:disabled{cursor:default;opacity:.55}
.fc-opt.right{border-color:var(--free);background:var(--free-soft);opacity:1}
.fc-opt.wrong{border-color:var(--lock);background:var(--lock-soft);opacity:1}
.fc-verdict{padding:12px 16px;border-radius:12px;font-size:15px}
.fc-verdict.ok{background:var(--free-soft)}
.fc-verdict.bad{background:var(--lock-soft)}
.fc-score{display:flex;gap:16px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.fc-score b{color:var(--ink);font-family:var(--f-mono)}
.fc-path{font-size:14px;color:var(--muted)}
.fc-path b{color:var(--ink)}
.fc-quiz .fc-wrap{height:auto;min-height:0}.fc-quiz .fc-flip{height:240px}.fc-quiz .fc-flip.flipped{height:clamp(460px,calc(100dvh - 250px),900px)}
@media (max-width:560px){.fc-bbody{padding:12px 16px 16px}.fc-pts li,.fc-rem{font-size:14px;line-height:1.38}.fc-mech .step{font-size:13.5px;padding:6px 10px;margin-bottom:14px}.fc-sec{margin-bottom:12px}.fc-bhead{padding:12px 16px 9px}.fc-wrap{height:clamp(440px,calc(100dvh - 215px),760px)}.fc-modes{display:grid;grid-template-columns:repeat(3,1fr);width:100%}.fc-modes button{padding:8px 4px;font-size:14px}.fc-chips{flex-wrap:nowrap;overflow-x:auto;margin-inline:-16px;padding:0 16px 4px;scrollbar-width:none}.fc-chips .chip{flex:none}.fc-ctrl .iconbtn{width:46px}.fc-opts{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){.fc-flip{transition:none}}
.prof-edit summary{list-style:none;cursor:pointer;justify-self:start;width:max-content}.prof-edit summary::-webkit-details-marker{display:none}.prof-edit[open] summary{display:none}
.page-head h1{overflow-wrap:anywhere}

/* ---------- плавность и темы ---------- */
html{scroll-behavior:smooth}
body{transition:background-color .35s var(--ease),color .35s var(--ease)}
.top,.panel,.plan,.stats div,.sections,.chip,.btn,.iconbtn,.nav a,.search input,select,.fc-deck,footer{transition:background-color .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease),box-shadow .3s var(--ease),transform .25s var(--ease)}
.panel,.plan,.stats div{box-shadow:var(--shadow-sm)}
.card{border:1.5px solid var(--line-strong);box-shadow:var(--shadow-sm);transition:border-color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease),background-color .3s var(--ease)}
.card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:var(--shadow)}
.btn:active,.chip:active,.iconbtn:active{transform:scale(.97)}
.fade-in{animation:fk-in .35s var(--ease)}
@keyframes fk-in{from{opacity:0}to{opacity:1}}
.theme-btn .moon{display:none}
:root[data-theme="dark"] .theme-btn .moon{display:block}:root[data-theme="dark"] .theme-btn .sun{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme]) .theme-btn .moon{display:block}:root:not([data-theme]) .theme-btn .sun{display:none}}
.chips .chip-toggle{border-style:dashed;color:var(--accent)}
.read-filter{display:flex;gap:6px;flex-wrap:wrap}
.read-filter .chip{font-size:13px;padding:5px 11px}
.read-more{justify-self:start}
/* полноэкранный режим на телефоне: только страница, панель выезжает по нажатию */
@media (max-width:760px){
  .viewer.reading{padding:0;gap:0}
  .viewer.reading .vbar{position:fixed;top:0;left:0;right:0;z-index:3;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:calc(8px + env(safe-area-inset-top,0px)) 12px 8px;transform:translateY(-105%);transition:transform .35s var(--ease)}
  .viewer.reading.ui .vbar{transform:none}
  .viewer.reading .stage{min-height:100dvh;display:grid;align-content:center}
  .viewer.reading .stage .sheet{width:calc((100vw - 16px) * var(--z,1))}
  .viewer.reading #sheetHost{padding:0}
  .viewer.reading .tap-hint{display:block}
}
.tap-hint{display:none;white-space:nowrap;position:fixed;left:50%;bottom:calc(16px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);z-index:4;background:color-mix(in srgb,var(--ink) 82%,transparent);color:var(--paper);font-size:13px;padding:6px 12px;border-radius:99px;pointer-events:none;opacity:0;transition:opacity .4s var(--ease)}
.tap-hint.on{opacity:1}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
.nav-theme{display:none;background:none;border:0;text-align:left;padding:8px 12px;border-radius:8px;color:var(--muted);font-weight:500}
@media (max-width:760px){.theme-btn{display:none}.nav-theme{display:block}}
/* страница методички отделена от фона */
.stage .sheet{box-shadow:0 0 0 1px rgba(19,36,42,.14),0 2px 6px rgba(19,36,42,.08),0 12px 32px rgba(19,36,42,.14)}
.viewer.reading{background:var(--desk)}
@media (min-width:761px){.viewer.reading{padding-top:calc(12px + env(safe-area-inset-top,0px))}.viewer.reading .vbar{position:fixed;top:0;left:0;right:0;z-index:3;background:var(--desk);padding:calc(10px + env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px));border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm);transform:translateY(-105%);transition:transform .45s var(--ease-out)}.viewer.reading.ui .vbar{transform:none}.viewer.reading .stage .sheet{width:calc(min(100%, (100vh - 28px) * 612 / 792) * var(--z,1))}.viewer.reading .tap-hint{display:block}}
/* ---------- тема в кабинете ---------- */
.theme-seg{display:inline-flex;justify-self:start;gap:4px;padding:4px;border:1px solid var(--line);border-radius:12px;background:var(--tint)}
.theme-seg button{display:inline-flex;align-items:center;gap:8px;border:0;background:none;padding:9px 16px;border-radius:9px;font-weight:500;color:var(--muted);transition:background-color .35s var(--ease),color .35s var(--ease),box-shadow .35s var(--ease)}
.theme-seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}
/* ---------- плавные анимации ---------- */
:root{--ease:cubic-bezier(.22,.8,.24,1);--ease-out:cubic-bezier(.16,1,.3,1)}
.theme-anim,.theme-anim *,.theme-anim *::before,.theme-anim *::after{transition:background-color .5s var(--ease),color .5s var(--ease),border-color .5s var(--ease),box-shadow .5s var(--ease)!important}
.fade-in{animation:fk-in .5s var(--ease-out)}
@keyframes fk-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes fk-fade{from{opacity:0}to{opacity:1}}
@keyframes fk-pop{from{opacity:0;transform:translateY(12px) scale(.97)}to{opacity:1;transform:none}}
@keyframes fk-up{from{opacity:0;transform:translateY(100%)}to{opacity:1;transform:none}}
@keyframes fk-toast{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}
@keyframes fk-drop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
.modal:not([hidden]){animation:fk-fade .3s var(--ease)}
.modal:not([hidden]) .dialog{animation:fk-pop .4s var(--ease-out)}
.toast:not([hidden]){animation:fk-toast .4s var(--ease-out)}
.cookie-bar:not([hidden]){animation:fk-up .5s var(--ease-out)}
.nav.open{animation:fk-drop .3s var(--ease-out)}
#readList>div:not([hidden]),.fc-deck{animation:fk-fade .4s var(--ease)}
body.reading-lock .fade-in{animation:none}
.card{transition:border-color .35s var(--ease),transform .35s var(--ease-out),box-shadow .35s var(--ease),background-color .35s var(--ease)}
.btn,.chip,.iconbtn,.nav a{transition:background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease),box-shadow .25s var(--ease),transform .2s var(--ease-out)}
.prog i{transition:width .6s var(--ease-out)}
details>summary{transition:color .25s var(--ease)}
details[open]>*:not(summary){animation:fk-drop .35s var(--ease-out)}
.fc-flip{transition:transform .6s var(--ease-out)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
/* ---------- анимации в духе iOS: пружины вместо обычных кривых ---------- */
:root{--spring:cubic-bezier(.22,1,.36,1);--spring-bounce:cubic-bezier(.34,1.3,.64,1)}
@supports (transition-timing-function:linear(0,1)){:root{--spring:linear(0, .0198, .0691, .1357, .2111, .2895, .367, .4409, .5099, .573, .6299, .6808, .7258, .7653, .7997, .8296, .8554, .8776, .8966, .9128, .9266, .9383, .9483, .9567, .9637, .9697, .9747, .9789, .9824, .9854, .9878, .9899, .9916, .993, .9942, .9952, .996, .9967, .9973, .9978, 1);--spring-bounce:linear(0, .0181, .0653, .132, .2106, .2954, .3817, .4661, .5462, .6204, .6877, .7478, .8003, .8457, .8841, .9162, .9426, .9639, .9807, .9936, 1.0033, 1.0102, 1.015, 1.0179, 1.0195, 1.0199, 1.0196, 1.0186, 1.0173, 1.0157, 1.0141, 1.0123, 1.0107, 1.0091, 1.0076, 1.0062, 1.005, 1.004, 1.0031, 1.0023, 1)}}
:root{--ease-out:var(--spring)}
html{-webkit-tap-highlight-color:transparent}
.fade-in{animation:ios-page .65s var(--spring)}
@keyframes ios-page{from{opacity:0;transform:translateY(16px) scale(.99)}to{opacity:1;transform:none}}
@keyframes ios-pop{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:none}}
@keyframes ios-sheet{from{transform:translateY(100%)}to{transform:none}}
@keyframes ios-toast{from{opacity:0;transform:translate(-50%,28px) scale(.9)}to{opacity:1;transform:translate(-50%,0)}}
@keyframes ios-drop{from{opacity:0;transform:translateY(-12px) scale(.98)}to{opacity:1;transform:none}}
@keyframes ios-row{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes ios-next{from{opacity:.2;transform:translateX(56px)}to{opacity:1;transform:none}}
@keyframes ios-prev{from{opacity:.2;transform:translateX(-56px)}to{opacity:1;transform:none}}
.btn,.chip,.iconbtn,.card,.fc-deck,.theme-seg button,.nav a,.linkbtn{transition:background-color .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease),box-shadow .45s var(--spring),transform .55s var(--spring-bounce)}
.btn:active,.chip:active,.iconbtn:active,.theme-seg button:active,.fc-deck:active{transform:scale(.95);transition-duration:.12s}
.card:active{transform:scale(.98);transition-duration:.12s}
.card:hover{transform:translateY(-4px)}
.modal:not([hidden]){animation:fk-fade .35s var(--ease);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.modal:not([hidden]) .dialog{animation:ios-pop .55s var(--spring-bounce)}
@media (max-width:560px){.modal{place-items:end center;padding:0}.dialog{width:100%;max-height:88vh;border-radius:22px 22px 0 0;padding-bottom:calc(28px + env(safe-area-inset-bottom,0px))}.modal:not([hidden]) .dialog{animation:ios-sheet .6s var(--spring)}}
.toast:not([hidden]){animation:ios-toast .6s var(--spring-bounce)}
.cookie-bar:not([hidden]){animation:ios-sheet .7s var(--spring)}
.nav.open{animation:ios-drop .5s var(--spring)}
.viewer.reading .vbar{transition:transform .6s var(--spring)}
.fc-flip{transition:transform .75s var(--spring-bounce)}
#readList>div:not([hidden]){animation:ios-row .5s var(--spring)}
details[open]>*:not(summary){animation:ios-drop .5s var(--spring)}
.prog i{transition:width .8s var(--spring)}
.sheet.in-next{animation:ios-next .5s var(--spring)}
.sheet.in-prev{animation:ios-prev .5s var(--spring)}
.tap-hint{transition:opacity .5s var(--ease)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
/* кнопки под карточкой: стрелки шире, «Перевернуть» уже */
.fc-ctrl.nav3 #fcPrev,.fc-ctrl.nav3 #fcNext{width:auto;flex:1 1 0}
.fc-ctrl.nav3 #fcFlipBtn{flex:2 1 0;padding-inline:8px;min-width:0}
.fc-ctrl.nav3 #fcShuf{flex:none}
/* галочка автопродления над тарифами */
.auto-pick{margin:0 0 16px;padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:var(--tint);color:var(--muted);align-items:center;cursor:pointer;width:fit-content;max-width:100%}
.auto-pick b{color:var(--ink);font-weight:600}
.auto-pick input{width:18px;height:18px;accent-color:var(--accent);flex:none;margin:0}
/* ---------- лента страниц: методичка листается вверх-вниз одним файлом, как Reels ---------- */
#sheetHost{display:grid;gap:16px;align-content:start}
.slot{min-width:0}
.viewer.reading{padding-block:0;scroll-snap-type:y mandatory;overscroll-behavior:contain}
.viewer.reading.zoomed{scroll-snap-type:y proximity}
.viewer.reading #sheetHost{gap:0;overflow:visible;padding:0}
.viewer.reading .slot{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;justify-content:center;padding-block:8px;scroll-snap-align:start;scroll-snap-stop:always}
.viewer.reading.zoomed .slot{scroll-snap-stop:normal}
.viewer.reading .stage{min-height:0;display:block}
@media (min-width:761px){.viewer.reading{padding-top:0}.viewer:not(.reading) .vbar{position:sticky;top:calc(65px + env(safe-area-inset-top,0px));z-index:5;background:var(--paper);padding-block:10px;margin-block:-10px}.viewer:not(.reading) .thumbs{top:calc(145px + env(safe-area-inset-top,0px));max-height:calc(100vh - 165px)}}
/* на телефоне при прокрутке ленты кнопки листания остаются под шапкой, а название уезжает */
@media (max-width:760px){.viewer:not(.reading) .vbar{position:sticky;top:calc(65px + env(safe-area-inset-top,0px) - var(--vh-hide,0px));z-index:5;background:var(--paper);padding-block:8px;margin-block:-8px}}
/* ---------- вид просмотра: «Список» или «Книга» ---------- */
.vmode{display:inline-flex;flex:none;margin-left:auto;gap:2px;padding:3px;border:1px solid var(--line);border-radius:10px;background:var(--tint)}
.vmode button{display:inline-flex;align-items:center;gap:6px;border:0;background:none;padding:6px 10px;border-radius:7px;font-size:13px;font-weight:500;color:var(--muted);transition:background-color .3s var(--ease),color .3s var(--ease),box-shadow .3s var(--ease)}
.vmode button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}
@media (max-width:560px){.vmode button span{display:none}.vmode button{padding:7px 9px}}
.viewer.book.reading{scroll-snap-type:none}
.viewer.book.reading .slot{scroll-snap-align:none}
/* быстрое перелистывание: без встроенного сглаживания, увеличенная страница прокручивается свободно */
.viewer.reading{scroll-behavior:auto}
.viewer.reading.gliding,.viewer.reading.zoomed{scroll-snap-type:none}
/* двойное нажатие на кнопки не увеличивает страницу на телефоне (щипок для масштаба работает) */
button,a,label,.chip,.iconbtn,.fc-ctrl,.fc-flip,.fc-wrap,.vbar,.viewer.reading{touch-action:manipulation}
/* вход: пароль и код */
.auth-alt{display:grid;gap:10px;justify-items:center;margin-top:4px}
.auth-alt .btn{justify-self:stretch}