/* Нүүр шинжих ухаан. Нэг харанхуй, алтлаг загвар (зориуд ганц сэдэвтэй). */
:root{
  --bg:#120d0a;
  --bg-2:#1a130e;
  --surface:#211812;
  --line:#4a3a2a;
  --fg:#f3e8d2;
  --gold:#e8d3a0;
  --gold-d:#b8955a;
  --muted:#b7a68a;
  --f:"Noto Sans","Segoe UI",Roboto,Arial,sans-serif;
  --f-serif:"Noto Serif",Georgia,serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:400 17px/1.7 var(--f)}
img{max-width:100%;height:auto;display:block}
a{color:var(--gold)}
p{margin:0 0 14px}
h1,h2,h3{font-family:var(--f);font-weight:800;line-height:1.15;margin:0 0 14px;text-wrap:balance;color:var(--gold)}
h1{font-size:clamp(2.1rem,8vw,3.4rem)}
h2{font-size:clamp(1.55rem,5vw,2.1rem);margin-top:34px}
h3{font-size:1.25rem}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.skip{position:absolute;left:-999px;top:0;background:var(--gold);color:#1b1410;padding:10px 14px;z-index:30}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1080px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.narrow{max-width:760px}
.center{text-align:center}
.muted{color:var(--muted)}
.small{font-size:14.5px}
.eyebrow{display:block;font-size:13px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--gold-d);margin:0 0 10px}
.eyebrow.center{text-align:center}
.lead{font-size:1.15rem;color:#e6d9bf}
.lead.center{max-width:36em;margin-inline:auto}

/* header */
.top{position:sticky;top:0;z-index:20;background:rgba(18,13,10,.96);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0px)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:76px;flex-wrap:wrap;padding-block:10px}
.brand{text-decoration:none;display:block;min-width:0}
.brand b{display:block;font-weight:800;letter-spacing:.09em;color:var(--gold);font-size:clamp(1.15rem,4.6vw,1.6rem);line-height:1.1}
.brand small{display:block;letter-spacing:.2em;color:var(--muted);font-size:clamp(.7rem,2.6vw,.85rem);margin-top:4px}
.menu-btn{background:transparent;color:var(--gold);border:1.5px solid var(--gold-d);border-radius:10px;min-height:50px;padding:0 18px;font:700 1.1rem var(--f);cursor:pointer}
#nav{display:none;flex-basis:100%;flex-direction:column;border-top:1px solid var(--line);padding:6px 0 10px}
#nav.open{display:flex}
#nav a{color:var(--fg);text-decoration:none;padding:14px 4px;border-bottom:1px solid var(--line);font-size:1.05rem}
#nav a[aria-current="page"]{color:var(--gold)}
#nav .nav-cta{color:var(--gold);font-weight:700}
@media (min-width:960px){
  .menu-btn{display:none}
  #nav,#nav.open{display:flex;flex-direction:row;flex-basis:auto;border:0;padding:0;gap:4px;align-items:center}
  #nav a{border:0;padding:10px 12px;font-size:1rem;border-radius:8px}
  #nav a:hover{background:var(--surface)}
  #nav a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--gold-d)}
  #nav .nav-cta{border:1px solid var(--gold-d);margin-left:8px}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:56px;padding:0 34px;border-radius:12px;border:1.5px solid var(--gold-d);background:linear-gradient(180deg,#ecd9a8,#b8955a);color:#1a120b;font:800 1.15rem var(--f);text-decoration:none;text-align:center;cursor:pointer}
.btn:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent;color:var(--gold);font-size:1rem;min-height:48px;padding:0 22px}
.btn.ghost:hover{background:var(--surface)}
.btn.block{display:flex;width:100%}

/* hero */
.hero{padding-block:34px 44px;background:radial-gradient(ellipse 70% 38% at 50% 14%,rgba(120,80,40,.38),transparent 70%)}
.hero h1{text-align:center;color:var(--gold);margin:6px 0 18px}
.chart{margin:28px auto;max-width:620px;border:1px solid var(--gold-d);border-radius:20px;overflow:hidden;box-shadow:0 0 60px rgba(184,149,90,.16)}
.chart img{width:100%}

/* sections, cards */
.sec{padding-block:36px}
.sec-h{margin-bottom:20px}
.h1s{font-size:clamp(2rem,7vw,3rem)}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(100%,290px),1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;min-width:0}
.card ul{margin:0;padding-left:20px}
.card li{margin:4px 0}
.course{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--fg);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;min-width:0}
.course:hover{border-color:var(--gold-d)}
.course h3{margin:0}
.course p{margin:0;color:var(--muted);font-size:15.5px}
.cfoot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:12px;border-top:1px solid var(--line)}
.price{font-weight:800;font-size:1.5rem;color:var(--gold);font-variant-numeric:tabular-nums}
.price.big{font-size:2.2rem}
.meta{font-size:14.5px;color:var(--muted)}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.tag{display:inline-block;font-size:13px;padding:2px 11px;border:1px solid var(--line);border-radius:99px;color:var(--muted);white-space:nowrap}
.tag.free{border-color:#93c58d;color:#93c58d}
.more{margin-top:18px}
.pairs{list-style:none;margin:0;padding:0;display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(min(100%,190px),1fr))}
.pairs li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:grid;gap:2px}
.pairs b{color:var(--gold);font-size:1.15rem}
.pairs span{color:var(--muted);font-size:15px}
.twelve{padding-left:0;list-style:none;counter-reset:o;display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr))}
.twelve li{counter-increment:o;display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 14px}
.twelve li::before{content:counter(o);flex:none;width:30px;height:30px;border-radius:50%;background:linear-gradient(180deg,#ecd9a8,#b8955a);color:#1a120b;font-weight:800;display:grid;place-items:center;font-size:14px}
details{border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-bottom:10px;padding:0 16px}
summary{cursor:pointer;padding:15px 0;font-weight:600;color:var(--gold);list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--gold-d)}
details[open] summary::after{content:"−"}
details p{color:var(--muted)}
.crumbs{font-size:14px;color:var(--muted);margin-bottom:16px}
.cols{display:grid;gap:24px;align-items:start;margin-top:10px}
@media (min-width:860px){.cols{grid-template-columns:1fr 340px}.buy{position:sticky;top:100px}}
.lessons{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.lessons li{display:grid;grid-template-columns:30px 1fr auto;gap:12px;align-items:center;padding:14px 16px;background:var(--surface);border-top:1px solid var(--line)}
.lessons li:first-child{border-top:0}
.lessons .n{font-weight:800;color:var(--gold-d);font-size:1.2rem}
.lessons .t{min-width:0;overflow-wrap:anywhere}
.notes p,.prose p,.prose li{font-size:17.5px}
.prose ul{padding-left:22px}
.prose li{margin:8px 0}
.cta-line{margin-top:24px;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:10px 18px;margin:0}
.kv dt{color:var(--muted)}
.kv dd{margin:0;overflow-wrap:anywhere}

/* footer */
.foot{border-top:1px solid var(--line);background:#0e0a07;margin-top:30px}
.foot .in{display:grid;gap:20px;padding-block:32px calc(40px + env(safe-area-inset-bottom,0px))}
.fbrand{color:var(--gold);letter-spacing:.09em}
.foot nav{display:flex;flex-wrap:wrap;gap:6px 20px}
.foot nav a{color:var(--muted);text-decoration:none;padding:6px 0}
.foot nav a:hover{color:var(--gold)}
@media (min-width:860px){.foot .in{grid-template-columns:1.4fr 1fr}}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}