/* Elrendezés: keskeny olvasóoszlop, benne „hangszerasztal” blokkok a kísérletekhez */
:root{
  --paper:#eef1ef; --panel:#f8faf9; --ink:#1c2830; --muted:#5a6a72;
  --bronze:#9a6a1f; --string:#2c7a80; --line:#c9d3d2; --good:#2e7d4f; --bad:#a8432f;
  --display:"Bodoni Moda","Playfair Display",Didot,"Times New Roman",serif;
  --body:"Source Serif 4",Georgia,serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#12191d; --panel:#1a2328; --ink:#e3e9ea; --muted:#93a3a9;
  --bronze:#d4a352; --string:#5cc3c9; --line:#2d3a40; --good:#6cc28f; --bad:#e08a74; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#12191d; --panel:#1a2328; --ink:#e3e9ea; --muted:#93a3a9;
  --bronze:#d4a352; --string:#5cc3c9; --line:#2d3a40; --good:#6cc28f; --bad:#e08a74; color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.06rem/1.65 var(--body);padding:0 16px}
a{color:var(--string)}
.wrap{max-width:46rem;margin:0 auto;padding-block:1.2rem 4rem;display:flex;flex-direction:column;gap:2.4rem}

/* felső sáv */
.topbar{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.6rem;
  font:500 .8rem var(--mono);border-bottom:1px solid var(--line);padding-bottom:.8rem}
.topbar a{color:var(--muted);text-decoration:none}
.topbar a:hover{color:var(--bronze)}
.langdd{position:relative}
.langdd summary{list-style:none;cursor:pointer;font:500 .75rem var(--mono);letter-spacing:.08em;padding:.3rem .55rem;border:1px solid var(--line);border-radius:4px;background:var(--panel);color:var(--ink);user-select:none}
.langdd summary::-webkit-details-marker{display:none}
.langdd summary::after{content:"▾";margin-left:.35rem;color:var(--muted)}
.langdd[open] summary{border-color:var(--bronze)}
.langdd summary:focus-visible{outline:2px solid var(--string);outline-offset:1px}
.langdd .langs{position:absolute;right:0;top:calc(100% + .3rem);z-index:30;display:flex;flex-direction:column;min-width:10rem;padding:.3rem;background:var(--panel);border:1px solid var(--line);border-radius:6px;box-shadow:0 6px 22px rgba(0,0,0,.18)}
.langdd .langs button{display:grid;grid-template-columns:2.2rem 1fr;align-items:baseline;text-align:left;border:0;background:none;color:var(--ink);font:400 .85rem var(--body);padding:.4rem .5rem;border-radius:4px;cursor:pointer}
.langdd .langs button b{font:500 .72rem var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.langdd .langs button:hover{background:var(--paper)}
.langdd .langs button[aria-pressed="true"]{color:var(--bronze)}
.langdd .langs button[aria-pressed="true"] b{color:var(--bronze)}
.theme{display:inline-flex;align-items:center;gap:0;padding:.2rem;border:1px solid var(--line);border-radius:999px;background:var(--panel);cursor:pointer;line-height:0}
.theme span{display:inline-flex;padding:.2rem .3rem;border-radius:999px;color:var(--muted)}
.theme[data-mode="light"] .t-sun,.theme[data-mode="dark"] .t-moon{background:var(--bronze);color:var(--panel)}
.theme:focus-visible{outline:2px solid var(--string);outline-offset:1px}
.prog{font:500 .75rem var(--mono);color:var(--muted);padding:.3rem .5rem;border:1px solid var(--line);border-radius:999px;white-space:nowrap;font-variant-numeric:tabular-nums}
.prog.all{color:var(--good);border-color:var(--good)}
.sidenav summary .sn-c.all{color:var(--good)}

.eyebrow{font:500 .78rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--bronze)}
h1{font:500 clamp(2.4rem,7vw,3.8rem)/1.05 var(--display);margin:.3rem 0 .8rem;text-wrap:balance}
h1 em{color:var(--bronze)}
h2{font:500 1.7rem/1.2 var(--display);margin:0 0 .6rem;text-wrap:balance}
p{margin:0 0 .9rem;max-width:65ch}
.lead{font-size:1.18rem;color:var(--muted)}

.bench{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:1.2rem;display:flex;flex-direction:column;gap:1rem}
canvas{width:100%;display:block;touch-action:none}
.controls{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
button{font:500 .9rem var(--mono);color:var(--ink);background:transparent;border:1px solid var(--line);border-radius:4px;padding:.45rem .8rem;cursor:pointer}
button:hover{border-color:var(--bronze)}
button[aria-pressed="true"]{background:var(--bronze);border-color:var(--bronze);color:var(--panel)}
button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--string);outline-offset:2px}
button.primary{border-color:var(--string);color:var(--string)}
.push{margin-left:auto}
.slider{display:flex;gap:.8rem;align-items:center;font:400 .85rem var(--mono);color:var(--muted)}
.slider input{flex:1;accent-color:var(--bronze);min-width:0}
.readout{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.6rem;font-family:var(--mono)}
.readout div{border-top:1px solid var(--line);padding-top:.4rem;min-width:0}
.readout small{display:block;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.readout b{font-weight:500;font-size:1.15rem;font-variant-numeric:tabular-nums}
.caption{font:400 .82rem/1.5 var(--mono);color:var(--muted);margin:0}
.note{border-left:2px solid var(--bronze);padding-left:1rem;color:var(--muted)}
.status{font:500 .95rem var(--body);min-height:1.5em;margin:0}
.status.ok{color:var(--good)} .status.bad{color:var(--bad)}

.split{display:grid;grid-template-columns:minmax(0,190px) minmax(0,1fr);gap:1.4rem;align-items:center}
.split svg{width:100%;max-width:190px}
@media (max-width:520px){.split{grid-template-columns:1fr}.readout{grid-template-columns:1fr 1fr}}

/* kvíz */
.quiz{display:flex;flex-direction:column;gap:1.4rem}
.q p{font-weight:600;margin-bottom:.5rem}
.q .opts{display:flex;flex-wrap:wrap;gap:.4rem}
.q button{text-align:left;font-family:var(--body);font-size:.98rem}
.q button.ok{background:var(--good);border-color:var(--good);color:var(--panel)}
.q button.bad{text-decoration:line-through;opacity:.6}
.fb{font:400 .9rem var(--body);color:var(--muted);margin-top:.4rem;min-height:1.4em}
.score{font:500 .9rem var(--mono);color:var(--muted)}

/* sorozat */
ol.road{list-style:none;padding:0;margin:0;display:flex;flex-direction:column}
ol.road li{display:grid;grid-template-columns:3rem 1fr auto;gap:.6rem;padding:.55rem 0;border-top:1px solid var(--line);align-items:baseline}
ol.road .n{font:500 .85rem var(--mono);color:var(--muted)}
ol.road a{color:var(--ink);text-decoration:none}
ol.road a:hover{color:var(--bronze)}
ol.road li.cur .n,ol.road li.cur a{color:var(--bronze);font-weight:600}
ol.road li.soon span:not(.n){color:var(--muted)}
ol.road .tag{font:400 .72rem var(--mono);color:var(--muted)}
ol.road .done{color:var(--good)}
.pager{display:flex;justify-content:space-between;gap:1rem;font:500 .85rem var(--mono)}
.pager a{text-decoration:none}

footer{font:400 .8rem/1.6 var(--mono);color:var(--muted);border-top:1px solid var(--line);padding-top:1rem}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* fiók */
.tb-right{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem}
.tb-right .who{color:var(--muted);max-width:14rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tb-right > button{font:500 .75rem var(--mono);padding:.3rem .6rem}
.account{margin-top:-1.4rem}
.account .fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(12rem,1fr));gap:.8rem}
.account label{display:flex;flex-direction:column;gap:.25rem;font:500 .75rem var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.account input{font:400 1rem var(--body);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:.5rem .6rem;min-width:0}
.account input:focus-visible{outline:2px solid var(--string);outline-offset:1px}
.account form{display:flex;flex-direction:column;gap:.9rem}
.account .status{min-height:0}

/* lenyíló dobozok: A könyvből / Forrásból / Haladóknak
   <details class="aside" data-kind="book|source|deep">
     <summary><span class="kind" data-c="aside_book"></span><span class="t" data-i18n="…"></span><span class="ref">§ 1.2.2</span></summary>
     <div class="aside-body" data-i18n="…"></div>
   </details> */
details.aside{--k:var(--bronze);border:1px solid var(--line);border-left:3px solid var(--k);border-radius:4px;background:var(--panel);margin-block:1rem}
details.aside[data-kind="source"]{--k:var(--string)}
details.aside[data-kind="deep"]{--k:var(--muted)}
details.aside > summary{list-style:none;cursor:pointer;display:flex;flex-wrap:wrap;align-items:baseline;gap:.25rem .7rem;padding:.65rem .9rem}
details.aside > summary::-webkit-details-marker{display:none}
details.aside > summary::before{content:"+";font:500 1rem/1 var(--mono);color:var(--k);width:.8rem;flex:none;transition:transform .2s}
details.aside[open] > summary::before{content:"–"}
details.aside .kind{font:500 .7rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--k)}
details.aside .t{font:600 1rem/1.35 var(--body);color:var(--ink);flex:1 1 14rem;min-width:0}
details.aside .ref{font:400 .75rem var(--mono);color:var(--muted);margin-left:auto}
details.aside > summary:hover .t{color:var(--k)}
details.aside > summary:focus-visible{outline:2px solid var(--string);outline-offset:2px}
details.aside .aside-body{padding:0 1rem .9rem 2.4rem;font-size:.98rem}
details.aside .aside-body p{margin:.5rem 0 0}
details.aside[data-kind="source"] .aside-body blockquote{margin:.5rem 0 0;font-style:italic}
details.aside .aside-body cite{display:block;margin-top:.4rem;font:400 .8rem var(--mono);font-style:normal;color:var(--muted)}
@media (max-width:520px){details.aside .aside-body{padding-left:1rem}}

/* könyvhivatkozás a fejlécben, továbbolvasás, fejezetcímek a tartalomjegyzékben */
.bookref{font:400 .82rem/1.5 var(--mono);color:var(--muted);margin:.2rem 0 0;max-width:none}
.bookref b{font-weight:500;color:var(--bronze)}
.further ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column}
.further li{display:grid;grid-template-columns:4.2rem minmax(0,1fr) auto;gap:.7rem;padding:.45rem 0;border-top:1px solid var(--line);align-items:baseline}
.further .sec{font:500 .8rem var(--mono);color:var(--bronze)}
.further .st{font-size:.98rem}
.further .pg{font:400 .78rem var(--mono);color:var(--muted);font-variant-numeric:tabular-nums}
ol.road li.chap{display:flex;gap:.8rem;align-items:baseline;border-top:2px solid var(--bronze);margin-top:1rem;padding-top:.6rem}
ol.road li.chap:first-child{margin-top:0}
ol.road li.chap span:first-child{font:500 .75rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--bronze);white-space:nowrap}
ol.road li.chap span:last-child{font:500 1.15rem var(--display);color:var(--ink)}
ol.road .tag{white-space:nowrap}
@media (max-width:520px){ol.road li{grid-template-columns:2.4rem 1fr}ol.road .tag{grid-column:2}.further li{grid-template-columns:3.6rem minmax(0,1fr)}.further .pg{grid-column:2}}

/* oldalsó fejezet-navigáció: asztali gépen bal oldali oszlop, keskeny kijelzőn a „☰ Fejezetek” gombbal nyíló panel */
.tb-left{display:flex;align-items:center;gap:.7rem;min-width:0}
.navbtn{display:none;font:500 .75rem var(--mono);padding:.3rem .6rem}
.sidenav{font-size:.92rem;line-height:1.35;display:flex;flex-direction:column;gap:.25rem;padding-block:1.2rem 2rem}
.sidenav .sn-home{font:500 1.25rem/1.15 var(--display);color:var(--ink);text-decoration:none;padding:0 .2rem .6rem;border-bottom:1px solid var(--line)}
.sidenav .sn-home:hover{color:var(--bronze)}
.sidenav .sn-label{font:500 .7rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:.6rem .2rem .2rem}
.sidenav details{border-bottom:1px solid var(--line)}
.sidenav summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:1.6rem minmax(0,1fr) auto;gap:.3rem;align-items:baseline;padding:.55rem .2rem;border-radius:4px}
.sidenav summary::-webkit-details-marker{display:none}
.sidenav summary:hover .sn-t{color:var(--bronze)}
.sidenav summary:focus-visible{outline:2px solid var(--string);outline-offset:1px}
.sidenav summary .sn-n{font:500 .8rem var(--mono);color:var(--bronze)}
.sidenav summary .sn-t{font:600 .95rem/1.3 var(--body);color:var(--ink)}
.sidenav summary .sn-c{font:400 .7rem var(--mono);color:var(--muted);font-variant-numeric:tabular-nums}
.sidenav details[open] summary .sn-t{color:var(--bronze)}
.sidenav ol{list-style:none;margin:0 0 .5rem;padding:0}
.sidenav li{display:grid;grid-template-columns:1.6rem minmax(0,1fr) auto;gap:.3rem;align-items:baseline;padding:.3rem .2rem;border-radius:4px}
.sidenav li .sn-n{font:400 .72rem var(--mono);color:var(--muted)}
.sidenav li a{color:var(--ink);text-decoration:none}
.sidenav li a:hover{color:var(--bronze);text-decoration:underline}
.sidenav li.cur{background:var(--panel);box-shadow:inset 2px 0 0 var(--bronze)}
.sidenav li.cur a{color:var(--bronze);font-weight:600}
.sidenav li.soon span:not(.sn-n){color:var(--muted);opacity:.75}
.sidenav .sn-done{color:var(--good);font-size:.8rem}

@media (min-width:1100px){
  body.has-sidenav{display:grid;grid-template-columns:17.5rem minmax(0,1fr);column-gap:2.5rem;align-items:start}
  body.has-sidenav .sidenav{position:sticky;top:env(safe-area-inset-top,0px);max-height:100vh;overflow-y:auto;border-right:1px solid var(--line);padding-right:1rem}
  body.has-sidenav .wrap{margin:0;width:100%}
  body.has-sidenav #simonyi-fail{grid-column:2}
}
@media (max-width:1099.98px){
  .navbtn{display:inline-block}
  body.has-sidenav .sidenav{display:none}
  body.nav-open .sidenav{display:flex;position:fixed;inset:0 auto 0 0;width:min(22rem,88vw);z-index:20;background:var(--paper);overflow-y:auto;padding:calc(1rem + env(safe-area-inset-top,0px)) 16px calc(2rem + env(safe-area-inset-bottom,0px));box-shadow:0 0 0 100vmax rgba(0,0,0,.35)}
  body.nav-open{overflow:hidden}
}
.sidenav .sn-close{display:none;align-self:flex-end;font:500 .75rem var(--mono);padding:.3rem .6rem;margin-bottom:.4rem}
@media (max-width:1099.98px){body.nav-open .sidenav .sn-close{display:inline-block}}

/* „A könyvről” oldal és hivatkozásai */
.sidenav .sn-about{font:500 .78rem var(--mono);letter-spacing:.06em;color:var(--string);text-decoration:none;padding:.5rem .2rem 0}
.sidenav .sn-about:hover{color:var(--bronze);text-decoration:underline}
.aboutlink{font:500 .85rem var(--mono);margin:.4rem 0 0}
.aboutlink a{color:var(--string)}
.about h3{font:600 1.1rem/1.3 var(--body);margin:1.4rem 0 .3rem;color:var(--bronze)}
.about ul{padding-left:1.2rem}
.about li{margin:.3rem 0}
.about blockquote{margin:1rem 0;padding:.6rem 1rem;border-left:3px solid var(--bronze);background:var(--panel);font-style:italic}
.about blockquote .caption{display:block;font-style:normal;margin-top:.4rem}
.about blockquote .tr{display:block;font-style:normal;color:var(--muted);margin-top:.3rem}