/* Nariné — design C "calm premium". Fonts self-hosted (no third-party CDNs: must work from Russia). */
@font-face{font-family:"Instrument Serif";src:url(../fonts/instrument-serif.ttf) format("truetype");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Instrument Serif";src:url(../fonts/instrument-serif-italic.ttf) format("truetype");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Cormorant Garamond";src:url(../fonts/cormorant-normal.ttf) format("truetype");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Cormorant Garamond";src:url(../fonts/cormorant-italic.ttf) format("truetype");font-weight:500;font-style:italic;font-display:swap}
@font-face{font-family:"Plus Jakarta Sans";src:url(../fonts/jakarta-400.ttf) format("truetype");font-weight:400;font-display:swap}
@font-face{font-family:"Plus Jakarta Sans";src:url(../fonts/jakarta-500.ttf) format("truetype");font-weight:500;font-display:swap}
@font-face{font-family:"Plus Jakarta Sans";src:url(../fonts/jakarta-600.ttf) format("truetype");font-weight:600;font-display:swap}
@font-face{font-family:"Plus Jakarta Sans";src:url(../fonts/jakarta-700.ttf) format("truetype");font-weight:700;font-display:swap}
@font-face{font-family:Inter;src:url(../fonts/inter-400.ttf) format("truetype");font-weight:400;font-display:swap}
@font-face{font-family:Inter;src:url(../fonts/inter-500.ttf) format("truetype");font-weight:500;font-display:swap}
@font-face{font-family:Inter;src:url(../fonts/inter-600.ttf) format("truetype");font-weight:600;font-display:swap}
@font-face{font-family:Inter;src:url(../fonts/inter-700.ttf) format("truetype");font-weight:700;font-display:swap}

:root{--bg:#07080F;--panel:#0d0e18;--txt:#EDEBF7;--mut:#9A98B3;--line:rgba(255,255,255,.09);--glass:rgba(255,255,255,.045);
--teal:#5EEAD4;--iris:#8B7CFF;--rose:#F6A6C1;--gold:#F3D9A4;--danger:#FF8A9A;
--sans:"Plus Jakarta Sans",Inter,system-ui,sans-serif;--serif:"Instrument Serif","Cormorant Garamond",Georgia,serif}
*{box-sizing:border-box;margin:0;padding:0}
html,body{min-height:100%}
body{background:var(--bg);color:var(--txt);font-family:var(--sans);font-size:15px;line-height:1.5;position:relative;-webkit-font-smoothing:antialiased}
body:before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
background:radial-gradient(600px 400px at 85% 8%,rgba(139,124,255,.32),transparent 70%),radial-gradient(520px 380px at 8% 92%,rgba(94,234,212,.20),transparent 70%),radial-gradient(420px 300px at 55% 55%,rgba(246,166,193,.10),transparent 70%)}
body>*{position:relative;z-index:1}
a{color:inherit;text-decoration:none}
.serif{font-family:var(--serif);font-weight:400}
.grad{background:linear-gradient(90deg,var(--teal),var(--iris) 50%,var(--rose));-webkit-background-clip:text;background-clip:text;color:transparent}
.lab{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mut)}
.muted{color:var(--mut)}
.gl{background:var(--glass);border:1px solid var(--line);border-radius:24px;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}
.p{padding:22px}
.btn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:99px;padding:13px 24px;font-weight:600;font-size:15px;border:0;cursor:pointer;font-family:inherit;background:linear-gradient(135deg,#fff,#d9d4ff);color:#0b0b16;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 30px rgba(139,124,255,.35)}
.btn.o{background:transparent;color:var(--txt);border:1px solid rgba(255,255,255,.2)}
.btn.sm{padding:9px 16px;font-size:13px}
.chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:rgba(255,255,255,.04);border-radius:99px;padding:6px 13px;font-size:13px;color:var(--mut)}
.chip a.on{color:var(--txt)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--teal);box-shadow:0 0 10px var(--teal);display:inline-block}
.av{width:38px;height:38px;border-radius:50%;flex:none;display:grid;place-items:center;font-size:13px;font-weight:600;color:#0b0b16;background:linear-gradient(135deg,var(--rose),var(--iris));object-fit:cover}
.ib{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;flex:none}
svg.i{width:18px;height:18px;flex:none}

/* forms */
.field{display:flex;flex-direction:column;gap:7px;margin-bottom:16px}
.field label{font-size:13px;color:var(--mut)}
.input{width:100%;background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:14px;padding:13px 15px;color:var(--txt);font:inherit;outline:none;transition:border-color .15s,box-shadow .15s}
.input:focus{border-color:rgba(139,124,255,.7);box-shadow:0 0 0 4px rgba(139,124,255,.15)}
.err{color:var(--danger);font-size:13px}
.check{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--mut)}

/* app shell */
.shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}
.side{padding:28px 18px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:3px;position:sticky;top:0;height:100vh;overflow:auto}
.side .logo{font-size:30px;margin:0 12px 4px}
.side .sub{font-size:12px;color:var(--mut);margin:0 12px 22px}
.nv{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:14px;color:var(--mut);font-size:14px}
.nv:hover{color:var(--txt);background:rgba(255,255,255,.04)}
.nv.on{background:rgba(255,255,255,.07);color:var(--txt);box-shadow:inset 0 0 0 1px var(--line)}
.nv.soon{opacity:.45;pointer-events:none}
.nv b{margin-left:auto;background:var(--iris);color:#fff;font-size:11px;border-radius:99px;padding:2px 8px}
.sec{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--mut);opacity:.6;margin:14px 14px 4px}
.me{margin-top:auto;padding:12px;display:flex;gap:12px;align-items:center;border-radius:18px}
.main{padding:30px 40px;min-width:0}
.top{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:22px;flex-wrap:wrap}
.h1{font-family:var(--serif);font-size:50px;line-height:1.05}
.grid{display:grid;gap:18px}
.g4{grid-template-columns:repeat(4,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
.k .n{font-family:var(--serif);font-size:62px;line-height:1;margin:8px 0 4px}
.it{display:flex;gap:14px;align-items:center;padding:12px 0;border-top:1px solid var(--line);font-size:14px}
.it:first-of-type{border-top:0}
.empty{padding:40px 24px;text-align:center;color:var(--mut)}

/* auth */
.auth{min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr}
.auth .art{padding:56px;display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid var(--line)}
.auth .art>*{align-self:flex-start}
.auth .form{display:grid;place-items:center;padding:40px}
.auth .card{width:100%;max-width:400px;padding:36px}

/* public */
.pnav{display:flex;justify-content:space-between;align-items:center;padding:26px 64px}
.hero{text-align:center;padding:40px 24px 0}
.hero h1{font-family:var(--serif);font-size:clamp(56px,9vw,118px);line-height:.95;letter-spacing:-.02em;margin-top:26px}
.hero p{font-size:19px;line-height:1.6;color:var(--mut);max-width:620px;margin:26px auto 34px}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,250px));justify-content:center;gap:18px;margin:56px auto 60px;padding:0 24px}
.cards .gl{padding:20px;text-align:left;display:block}
.cards b{display:block;font-size:17px;margin:10px 0 4px}
.cards span{font-size:13px;color:var(--mut)}

/* Mobile (Seb 10-25): the sidebar becomes a drawer behind a top bar; side-by-side page grids stack; nothing may widen the page. */
.mbar{display:none}
.side .close{display:none;position:absolute;top:18px;right:16px;background:none;border:1px solid var(--line);border-radius:10px;color:var(--txt);padding:4px 10px;font-size:18px;cursor:pointer}
.grid>*{min-width:0}
@media (max-width:900px){
 html,body{overflow-x:hidden}
 .shell{grid-template-columns:1fr}
 .mbar{display:flex;align-items:center;gap:12px;position:sticky;top:0;z-index:40;padding:12px 16px;background:rgba(11,11,22,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
 .mbar .logo{font-size:26px;flex:1}
 .mbar .burger{background:none;border:1px solid var(--line);border-radius:12px;color:var(--txt);padding:8px 12px;font:inherit;display:flex;gap:8px;align-items:center;cursor:pointer}
 .mbar .burger b{background:var(--iris);color:#fff;border-radius:999px;font-size:11px;padding:1px 7px}
 .side{position:fixed;inset:0;z-index:100;height:100dvh;width:100%;max-width:340px;background:#0b0b16;transform:translateX(-105%);transition:transform .2s;box-shadow:0 0 0 100vmax rgba(0,0,0,0);border-right:1px solid var(--line)}
 body.nav-open .side{transform:none;box-shadow:0 0 0 100vmax rgba(0,0,0,.55)}
 body.nav-open{overflow:hidden}
 .side .close{display:block}
 .main{padding:16px}
 .top{align-items:flex-start;margin-bottom:16px}
 .g4,.g3,.g2{grid-template-columns:1fr 1fr}.auth{grid-template-columns:1fr}.auth .art{display:none}
 .grid[style*="grid-template-columns"]{grid-template-columns:1fr!important}
 .grid>*{grid-column:auto!important}
 .calday{min-height:0!important}
 body.nav-open .mbar{visibility:hidden}
 .top>div{flex-wrap:wrap;max-width:100%}
 .top select{max-width:100%}
 .pnav{padding:20px}.cards{grid-template-columns:1fr 1fr}.h1{font-size:32px}
 .it,.file{flex-wrap:wrap}
 table{display:block;overflow-x:auto}
}
@media (max-width:560px){.g4,.g3,.g2,.cards{grid-template-columns:1fr}}
:root{color-scheme:dark}
select.input{appearance:none;-webkit-appearance:none;padding-right:40px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%239A98B3' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center}
select.input option{background:#0d0e18;color:var(--txt)}
textarea.input{resize:vertical;min-height:96px}
input[type=file]{font:inherit;font-size:13px}
input[type=file]::file-selector-button{font:inherit;font-weight:600;font-size:13px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:var(--txt);border-radius:99px;padding:8px 16px;margin-right:12px;cursor:pointer}
input[type=checkbox]{accent-color:var(--iris);width:16px;height:16px}
nav[role=navigation] a,nav[role=navigation] span{display:inline-flex;border:1px solid var(--line);border-radius:99px;padding:7px 14px;margin-right:8px;font-size:13px;color:var(--mut)}

/* covers (graphic images replace these gradients once Geek's set lands) */
.cover{border-radius:18px;aspect-ratio:3/2;position:relative;overflow:hidden;background:#11121e}
.cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(7,8,15,.55))}
.cover{background-size:cover;background-position:center}
.cover-general{--c1:#8B7CFF;--c2:#5EEAD4;background-image:url(../img/cover-general.webp)}.cover-business{--c1:#F3D9A4;--c2:#8B7CFF;background-image:url(../img/cover-business.webp)}.cover-exam{--c1:#5EEAD4;--c2:#F6A6C1;background-image:url(../img/cover-exams.webp)}
.cover-conversation{--c1:#F6A6C1;--c2:#8B7CFF;background-image:url(../img/cover-conversation.webp)}.cover-pronunciation{--c1:#5EEAD4;--c2:#F3D9A4;background-image:url(../img/cover-pronunciation.webp)}.cover-kids{--c1:#F3D9A4;--c2:#F6A6C1;background-image:url(../img/cover-kids.webp)}.cover-a1{--c1:#5EEAD4;--c2:#F6A6C1;background-image:url(../img/cover-a1.webp)}
.cover .lv{position:absolute;z-index:1;top:12px;left:12px}
.mod{border-top:1px solid var(--line);padding:16px 0}
.lesson{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:16px;margin-top:10px}
.lesson summary{list-style:none;cursor:pointer;padding:14px 16px;display:flex;gap:12px;align-items:center}
.lesson summary::-webkit-details-marker{display:none}
.lesson .in{padding:0 16px 16px}
.file{display:flex;gap:12px;align-items:center;padding:10px 12px;border-radius:12px;background:rgba(255,255,255,.04);margin-top:8px;font-size:14px}
.inline{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.linkbtn{background:none;border:0;color:var(--mut);font:inherit;cursor:pointer;padding:0;font-size:13px}
.linkbtn:hover{color:var(--danger)}
.prose{white-space:pre-line;color:#d8d6e8;line-height:1.7}
.prose .lh{display:inline-block;margin-top:8px;font-size:11px;letter-spacing:.14em;color:var(--teal);font-weight:600}

/* graphics (Geek, NAR-2) */
.hero2{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;max-width:1240px;margin:0 auto;padding:30px 40px 0;text-align:left}
.hero2 h1{font-family:var(--serif);font-size:clamp(56px,7.5vw,108px);line-height:.95;letter-spacing:-.02em;margin-top:22px}
.hero2 p{font-size:19px;line-height:1.6;color:var(--mut);max-width:560px;margin:24px 0 32px}
.portrait{position:relative;justify-self:center;width:min(420px,100%)}
.portrait img{display:block;width:100%;border-radius:28px;box-shadow:0 30px 80px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.08)}
.portrait:before{content:"";position:absolute;inset:-18px;border-radius:40px;background:radial-gradient(60% 60% at 30% 20%,rgba(139,124,255,.45),transparent 70%),radial-gradient(60% 60% at 80% 90%,rgba(94,234,212,.3),transparent 70%);filter:blur(24px);z-index:-1}
.portrait .badge{position:absolute;left:-28px;bottom:42px;padding:12px 16px;font-size:13px}
.feat-img{width:100%;aspect-ratio:4/3;object-fit:contain;margin:-6px 0 6px}
.about{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;max-width:1240px;margin:20px auto 80px;padding:0 40px}
.about img{width:100%;border-radius:28px;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.empty-img{width:min(260px,70%);display:block;margin:0 auto 6px}
@media (max-width:900px){.hero2,.about{grid-template-columns:1fr;padding:20px}.hero2{text-align:center}.hero2 p{margin-left:auto;margin-right:auto}.portrait .badge{left:10px}}

.tile{display:block;transition:transform .15s,border-color .15s,box-shadow .15s;cursor:pointer}
.tile:hover{transform:translateY(-2px);border-color:rgba(139,124,255,.45);box-shadow:0 12px 40px rgba(139,124,255,.18)}
/* user guide */
.guide h2{font-family:var(--serif);font-weight:400;font-size:38px;line-height:1.1;margin-bottom:12px}
.guide p,.guide li{color:#d8d6e8;line-height:1.7;font-size:15px}
.guide p{margin:10px 0}.guide ul{margin:10px 0 10px 20px}.guide li{margin:4px 0}
.guide strong{color:var(--txt)}
.guide code{background:rgba(255,255,255,.08);border-radius:6px;padding:1px 6px;font-size:13px}
.guide img{display:block;width:100%;border-radius:16px;margin:16px 0;box-shadow:0 0 0 1px var(--line),0 20px 50px rgba(0,0,0,.45)}
@media (max-width:900px){.help{grid-template-columns:1fr!important}.help nav{position:static!important}}
.folder{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:18px;margin-bottom:12px}
.folder>summary{list-style:none;cursor:pointer;padding:14px 16px;display:flex;gap:12px;align-items:center}
.folder>summary::-webkit-details-marker{display:none}
.folder>summary .chev{transition:transform .2s;color:var(--muted,#9a98b0)}
.folder[open]>summary .chev{transform:rotate(90deg)}
.folder>.in{padding:0 16px 14px}