:root{--paper:#f4efe4;--paper2:#ebe4d3;--ink:#1e1a16;--dim:#6d6459;--gold:#a8842e;--line:#d9cfb8}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden}
body{position:fixed;inset:0;background:var(--paper);color:var(--ink);font-family:"PT Serif",Georgia,"Times New Roman",serif;font-size:clamp(15px,.9vw + .45rem,19px);line-height:1.5}
p{text-align:justify;hyphens:auto}
h1,h2,h3{font-weight:700;letter-spacing:.02em;line-height:1.15}
a{text-decoration:none;color:inherit}
button{font:inherit;cursor:pointer;background:none;border:0;color:inherit}
.kicker{font-size:.72em;letter-spacing:.3em;text-transform:uppercase;color:var(--gold)}

/* home */
#home{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:3vh 5vw;gap:2.4vh}
.head{text-align:center}
.head h1{font-size:clamp(30px,4vw,60px);margin:.15em 0}
.head .author{color:var(--gold);letter-spacing:.25em;font-size:.85em}
#shelf{display:grid;grid-template-columns:repeat(4,1fr);gap:2.5vw;width:min(100%,1180px)}
.bk{display:block;text-align:center;transition:transform .35s ease}
.bk img{display:block;width:auto;max-width:100%;max-height:44vh;margin:0 auto;border-radius:2px;box-shadow:0 18px 40px rgba(30,26,22,.35),0 2px 4px rgba(0,0,0,.2)}
.bk:hover{transform:translateY(-8px)}
.bk .ask{margin-top:1em;font-size:1.02em;line-height:1.3;color:var(--ink)}
.bk .ask b{display:block;font-size:.72em;letter-spacing:.25em;color:var(--c);margin-bottom:.3em}
.ladder{text-align:center;color:var(--dim);font-size:.9em}
.ladder b{color:var(--ink);font-weight:400}.ladder span{margin:0 .5em;color:var(--gold)}
.note{text-align:center;color:var(--dim);font-size:.85em;max-width:60ch}
.progl{font-size:.72em;letter-spacing:.25em;text-transform:uppercase;color:var(--gold);border:1px solid var(--line);border-radius:3px;padding:.55em 1.4em;transition:border-color .25s,color .25s}
.progl:hover{border-color:var(--gold);color:var(--ink)}
.home-links{display:flex;justify-content:center;flex-wrap:wrap;gap:.6em}
.team{display:grid;grid-template-columns:repeat(3,1fr);gap:2vw;width:min(100%,1060px);text-align:center;align-items:end}
.team .tm{font-size:.95em}
.team small{display:block;font-size:.64em;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin-bottom:.25em;white-space:nowrap}

/* panel */
#panel{position:absolute;inset:0;background:var(--paper);display:flex;flex-direction:column;z-index:10;animation:in .35s ease}
#panel[hidden]{display:none}
@keyframes in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.pbar{display:flex;align-items:center;justify-content:space-between;padding:.6em 3vw;background:var(--c);color:#fff;flex:none}
#tabs{display:flex;gap:.4em;overflow-x:auto;scrollbar-width:none}
#tabs a{font-size:.7em;letter-spacing:.14em;padding:.35em .8em;border-radius:3px;color:#fff;background:var(--tc);opacity:.6;white-space:nowrap;text-decoration:none;box-shadow:inset 0 0 0 1px rgba(255,255,255,.25)}
#tabs a.on{opacity:1;box-shadow:inset 0 0 0 2px #e6c98a}
#close{font-size:1.6em;line-height:1;padding:0 .3em;color:#fff;opacity:.85}
.pbody{flex:1;min-height:0;display:grid;grid-template-columns:minmax(260px,30%) 1fr}
#pside{background:var(--c);color:#fff;padding:4vh 2.5vw;overflow-y:auto;display:flex;flex-direction:column;gap:1em}
#pside img{width:min(100%,220px);display:block;border-radius:2px;box-shadow:0 20px 40px rgba(0,0,0,.45);margin:0 auto}
#pside .bname{font-size:clamp(30px,3.2vw,48px);line-height:1;letter-spacing:.04em;color:#f1d99a;text-align:center}
#pside .btitle{font-size:.95em;letter-spacing:.12em;text-align:center;color:#fff}
#pside .bsub{opacity:.85;font-size:.9em;text-align:center}
#pside .meta{display:grid;grid-template-columns:auto 1fr;gap:.3em 1em;font-size:.82em;border-top:1px solid rgba(255,255,255,.25);padding-top:1em}
#pside .meta dt{color:#e6c98a;letter-spacing:.12em;font-size:.82em;text-transform:uppercase;padding-top:.15em}
#pside .ask{font-size:1.05em;line-height:1.35;padding-left:.8em;border-left:3px solid #e6c98a}
#pmain{overflow-y:auto;padding:4vh 4vw 6vh;scroll-behavior:smooth}
#pmain>*{max-width:1000px}
/* суурь өгүүлбэр + номын логикийн схем */
.scheme{max-width:900px}
.slabel{display:block;font-size:.68em;letter-spacing:.25em;text-transform:uppercase;color:var(--gold);margin:0 0 .5em}
.slabel+.slabel,.duo+.slabel{margin-top:1.1em}
.duo{display:grid;grid-template-columns:1fr auto 1fr;align-items:stretch}
.duo .d{background:var(--paper2);border:1px solid var(--line);padding:.7em 1em;font-size:.92em;line-height:1.35;font-style:italic}
.duo .d:first-child{border-right:3px solid var(--c);border-radius:3px 0 0 3px;text-align:right}
.duo .d:last-child{border-left:3px solid var(--c);border-radius:0 3px 3px 0}
.duo .d small{display:block;font-style:normal;font-size:.72em;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:.25em}
.duo .mid{display:flex;align-items:center;padding:0 .9em;color:var(--c);font-size:.9em}
.flow{display:flex;align-items:stretch;gap:.5em}
.flow .st{flex:1 1 0;display:flex;flex-direction:column;justify-content:center;text-align:center;background:var(--paper2);border:1px solid var(--line);border-bottom:2px solid var(--c);border-radius:3px;padding:.45em .5em;font-size:.85em;line-height:1.3}
.flow .st b{display:block;letter-spacing:.03em}
.flow .st span{display:block;color:var(--dim);font-size:.85em}
.flow .ar{align-self:center;color:var(--gold)}
.fnote{display:block;color:var(--dim);font-style:italic;font-size:.85em;margin-top:.6em;text-align:center}
#pmain h2{font-size:1.3em;margin:1.8em 0 .7em;color:var(--c);letter-spacing:.06em}
#pmain h2 small{display:block;font-size:.6em;letter-spacing:.25em;color:var(--gold);text-transform:uppercase;margin-bottom:.3em}
.parts{columns:3;column-gap:2.2em;font-size:.9em;line-height:1.4}
.part{break-inside:avoid;margin-bottom:1.1em}
.part h3{font-size:.85em;letter-spacing:.05em;text-transform:uppercase;margin-bottom:.3em;color:var(--c)}
.part h3 small{display:block;font-size:.8em;letter-spacing:.2em;color:var(--gold)}
.part ol{list-style:none;counter-reset:ch}
.part li{position:relative;padding-left:1.9em}
.part li:before{counter-increment:ch;content:counter(ch);position:absolute;left:0;color:var(--gold);font-size:.85em;width:1.5em;text-align:right;top:.1em}
.part.tail li{padding-left:0;color:var(--dim);font-style:italic}.part.tail li:before{content:none}
.two{display:grid;grid-template-columns:1.2fr 1fr;gap:3vw}
.prin ol{list-style:none;counter-reset:n}
.prin li{position:relative;padding-left:2.4em;margin-bottom:.55em}
.prin li:before{counter-increment:n;content:counter(n,decimal-leading-zero);position:absolute;left:0;top:.15em;font-size:.72em;color:var(--gold)}
.prin ol.check li:before{content:"?";font-size:1em;top:0;color:var(--c);font-weight:700}
.close{margin-top:1.2em;padding:1em 1.2em;background:var(--paper2);border-left:4px solid var(--c);font-style:italic;font-size:1.02em}
.close small{display:block;font-style:normal;font-size:.7em;letter-spacing:.25em;text-transform:uppercase;color:var(--gold);margin-bottom:.4em}
.app{margin-top:1.2em;font-size:.85em;color:var(--dim)}
.app b{display:block;color:var(--gold);letter-spacing:.2em;font-size:.85em;text-transform:uppercase;margin-bottom:.4em}
.app span{display:inline-block;margin:0 1.1em .2em 0}

@media (max-height:830px) and (min-width:901px){#home{gap:2vh}.bk img{max-height:42vh}}
@media (max-width:1200px){.parts{columns:2}}
@media (max-width:900px){
  body{font-size:15px}
  #home{justify-content:flex-start;padding-top:3vh;gap:2vh;overflow:hidden}
  .head h1{font-size:1.9em}
  #shelf{grid-template-columns:1fr 1fr;gap:3vw 4vw}
  .bk img{max-height:24vh}
  .bk .ask{font-size:.88em;margin-top:.5em}
  .ladder,.note{display:none}
  .team{grid-template-columns:1fr;gap:1.2vh;font-size:.85em}
  .pbar{padding:.5em 3vw}
  .pbody{grid-template-columns:1fr;overflow-y:auto}
  #pside{overflow:visible;padding:3vh 5vw}
  #pside img{width:40vw}
  #pmain{overflow:visible;padding:3vh 5vw 8vh}
  .duo{grid-template-columns:1fr}
  .duo .mid{display:none}
  .duo .d:first-child{border-right:1px solid var(--line);border-left:3px solid var(--c);border-radius:3px 3px 0 0;text-align:left}
  .duo .d:last-child{border-radius:0 0 3px 3px}
  .flow{flex-direction:column;gap:.4em}
  .flow .ar{display:none}
  .parts{columns:1}
  .two{grid-template-columns:1fr}
}
@media (max-width:900px) and (max-height:640px){.bk img{max-height:24vh}}

.pdf-download{display:block;width:fit-content;max-width:100%;margin:0 0 1.5em;padding:.65em 1em;border:1px solid var(--c);color:var(--c);font-size:.85em}
.pdf-download:hover{background:var(--paper2)}
.pdf-download:focus-visible,.progl:focus-visible{outline:2px solid var(--gold);outline-offset:4px}

.pdf-actions{display:flex;align-items:center;flex-wrap:wrap;gap:.7em;margin-bottom:1.5em}
.pdf-actions .pdf-download{margin:0}

/* Five-book extension; original four-book visual identity retained. */
#shelf{grid-template-columns:repeat(5,minmax(0,1fr))}
.yellow-cover{aspect-ratio:0.68;background:linear-gradient(120deg,#e7c557,#c59c24);color:#352b13;box-shadow:0 18px 40px #1e1a1659;border:1px solid #ba922c;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2rem;padding:1rem;max-height:44vh;margin:auto;text-align:center}
.yellow-cover strong{font-size:clamp(2rem,4vw,4rem);letter-spacing:.12em}.yellow-cover small,.yellow-cover span{font-size:.7rem}
#pmain p{text-align:justify;text-align-last:left}#pside .yellow-cover{width:100%;max-height:none}
@media(max-width:900px){#shelf{grid-template-columns:repeat(2,minmax(0,1fr))}.yellow-cover{max-height:24vh}.yellow-cover strong{font-size:2rem}.yellow-cover{gap:.8rem}}

.yellow-outline section{margin:2.5rem 0}.yellow-outline article{margin:1.5rem 0}.yellow-outline li{text-align:justify;text-align-last:left;margin:.65rem 0}.yellow-outline h3{font-size:1.05rem;line-height:1.6}.yellow-outline ul{list-style:none;padding:0}
#panel:has(.yellow-outline) #pmain{--c:#79601c}
@media(max-width:900px){#pside .yellow-cover{aspect-ratio:auto;height:180px;max-height:180px;width:min(100%,260px);gap:1rem}}