/* Simulations Library — drafting-sheet styling. Site tokens from shared/site.css. */
.lib [hidden]{display:none!important}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.lib{max-width:1180px;margin:0 auto;padding:64px 24px 48px;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:24px 24px}
.lib-mono,.lib-tb,.lib-stats b,.lib-tile-count,.lib-opt-n,.lib-count{font-family:ui-monospace,'SF Mono',Menlo,Consolas,monospace;font-variant-numeric:tabular-nums}
.lib-tb{display:flex;flex-wrap:wrap;border:1px solid var(--border);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);margin-bottom:28px}
.lib-tb div{padding:7px 12px;border-right:1px solid var(--border)}
.lib-tb div:last-child{border-right:0;margin-left:auto}
.lib-crumbs{font-size:.8rem;color:var(--text-dim);display:flex;gap:8px}
.lib-crumbs a{color:var(--text-dim)}
.lib h1{font-size:clamp(2rem,4.4vw,3.1rem);font-weight:650;letter-spacing:-.02em;margin:10px 0 12px}
.lib-lede{max-width:62ch;color:#b4bdd4;line-height:1.6}
.lib-stats{list-style:none;display:flex;gap:22px;margin:18px 0 0;color:var(--text-dim);font-size:.85rem}
.lib-stats b{color:var(--text);font-size:1.15rem;font-weight:500;margin-right:4px}

.lib-bar{position:sticky;top:0;z-index:5;display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:28px 0 18px;padding:10px 0;background:var(--bg);border-bottom:1px solid var(--border)}
.lib-search{flex:1 1 260px;position:relative}
.lib-search input{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:8px;color:var(--text);padding:10px 36px 10px 12px;font:inherit}
.lib-search input:focus{outline:2px solid var(--accent);outline-offset:1px}
.lib-q-clear{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:none;border:0;color:var(--text-dim);font-size:1.2rem;width:28px;height:28px;cursor:pointer}
.lib-seg{display:flex;border:1px solid var(--border);border-radius:8px;overflow:hidden}
.lib-seg button{background:var(--surface);color:#b4bdd4;border:0;border-right:1px solid var(--border);padding:9px 14px;font:inherit;font-size:.85rem;cursor:pointer;min-height:40px}
.lib-seg button:last-child{border-right:0}
.lib-seg button[aria-pressed="true"]{background:var(--accent-lo);color:#fff;box-shadow:inset 0 -2px 0 var(--accent)}
.lib-seg button:focus-visible,.lib-opt:focus-visible,.lib-tile:focus-visible,.lib-also button:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}

.lib-map{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--border);border-left:1px solid var(--border)}
.lib-tile{position:relative;text-align:left;background:transparent;border:0;border-right:1px solid var(--border);border-bottom:1px solid var(--border);color:var(--text);padding:14px 14px 12px;min-height:132px;cursor:pointer;font:inherit;display:flex;flex-direction:column}
.lib-tile:hover,.lib-tile[aria-pressed="true"]{background:rgba(79,142,247,.07)}
.lib-tile[aria-pressed="true"]{box-shadow:inset 0 -2px 0 var(--accent)}
.lib-tile-no{position:absolute;top:10px;right:12px;font-size:.66rem;color:#3a4566;font-family:ui-monospace,Menlo,monospace}
.lib-tile-name{font-weight:600;font-size:.95rem;padding-right:24px}
.lib-tile-count{font-size:1.9rem;font-weight:300;color:#9fbdf9;margin-top:6px}
.lib-tile-topics{font-size:.72rem;color:var(--text-dim);margin-top:auto;line-height:1.4;padding-right:76px}
.lib-tile canvas{position:absolute;right:10px;bottom:10px;width:68px;height:44px}

.lib-drill{margin-top:4px}
.lib-cols{display:grid;grid-template-columns:1.1fr 1.2fr 1fr;gap:10px}
.lib-col{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:8px}
.lib-col-h{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);padding:4px 8px 8px}
.lib-col-list{max-height:480px;overflow-y:auto}
.lib-col-sub{font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:#3a4566;padding:10px 8px 4px}
.lib-opt{display:flex;justify-content:space-between;gap:10px;width:100%;text-align:left;background:none;border:0;border-radius:6px;color:#c4cbe0;padding:8px 10px;font:inherit;font-size:.88rem;cursor:pointer;min-height:36px}
.lib-opt:hover{background:var(--surface2)}
.lib-opt[aria-pressed="true"]{background:var(--accent-lo);color:#fff;box-shadow:inset 2px 0 0 var(--accent)}
.lib-opt:disabled{opacity:.35;cursor:default;background:none}
.lib-opt-n{color:var(--text-dim);font-size:.8rem}
.lib-steps{display:none}

.lib-results{margin-top:22px}
.lib-count{color:var(--text-dim);font-size:.85rem;margin:0 0 10px}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.lib-card{position:relative;display:flex;gap:12px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px;transition:border-color .15s,transform .15s,box-shadow .15s}
.lib-card:hover,.lib-card:focus-within{border-color:#4a5a92;transform:translateY(-2px);box-shadow:0 8px 22px -14px rgba(79,142,247,.55)}
.lib-card img{width:64px;height:64px;border-radius:8px;flex:none}
.lib-card h3{font-size:.95rem;margin:0 0 4px}
.lib-card-link{color:var(--text);text-decoration:none}
.lib-card-link::after{content:"";position:absolute;inset:0;border-radius:10px}
.lib-card-link:focus-visible{outline:none}
.lib-card-link:focus-visible::after{outline:2px solid var(--accent);outline-offset:2px}
.lib-card-desc{font-size:.8rem;color:#9aa6c4;line-height:1.45;margin:0 0 8px}
.lib-tags{display:flex;flex-wrap:wrap;gap:4px;margin:0}
.lib-tag{font-family:ui-monospace,Menlo,monospace;font-size:.62rem;letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--border);border-radius:4px;padding:2px 6px;color:#9aa6c4}
.lib-also{font-size:.74rem;color:var(--text-dim);margin:8px 0 0;position:relative;z-index:1}
.lib-also span{display:block;margin-bottom:2px}
.lib-also button{display:block;min-height:28px;text-align:left;background:none;border:0;padding:4px 0;color:#9fbdf9;font:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:2px}
.lib-empty{border:1px dashed var(--border);border-radius:10px;padding:28px;text-align:center;color:#b4bdd4}
.lib-btn{margin-top:10px;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:9px 16px;font:inherit;cursor:pointer}
.lib-ad{margin:10px 0}

.lib-index{margin-top:56px;border-top:1px solid var(--border);padding-top:24px}
.lib-index h2{font-size:1.1rem}
.lib-article{margin-top:48px;max-width:72ch;line-height:1.7;color:#b4bdd4}
.lib-article a{color:#9fbdf9}

@media (max-width:768px){
  .lib{padding:64px 16px 40px}
  .lib-map{grid-template-columns:repeat(2,1fr)}
  .lib-tb div:nth-child(4){display:none}
}
@media (max-width:720px){
  .lib-steps{display:flex;gap:6px;margin-bottom:8px;overflow-x:auto}
  .lib-steps button{flex:none;background:var(--surface);border:1px solid var(--border);border-radius:99px;color:#b4bdd4;padding:7px 12px;font:inherit;font-size:.8rem;min-height:36px}
  .lib-steps button[aria-selected="true"]{border-color:var(--accent);color:#fff}
  .lib-cols{grid-template-columns:1fr}
  .lib-col{display:none}
  .lib-col.is-step{display:block}
  .lib-grid{grid-template-columns:1fr}
}
@media (max-width:500px){
  .lib-tile{min-height:112px;padding:12px}
  .lib-tile-count{font-size:1.5rem}
  .lib-tile-topics{display:none}
  .lib-bar{gap:8px}
  .lib-seg button{padding:8px 10px}
}
@media (prefers-reduced-motion:reduce){.lib-card,.lib-card:hover,.lib-card:focus-within{transition:none;transform:none}}

/* ── Animated hero banner (library/banner.js) ── */
.lib-hero{position:relative;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#0b0f16;min-height:340px}
.lib-hero canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.lib-hero-fade{position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,rgba(11,15,22,.95) 0%,rgba(11,15,22,.78) 36%,rgba(11,15,22,.15) 64%,rgba(11,15,22,0) 80%)}
.lib-hero .lib-head{position:relative;z-index:1;padding:22px 28px 40px;max-width:640px;pointer-events:none}
.lib-hero .lib-head a{pointer-events:auto}
.lib-hero .lib-tb{margin-bottom:24px;background:rgba(11,15,22,.6)}
.lib h1 em{font-style:normal;background:linear-gradient(100deg,#4f8ef7 0%,#9fbdf9 50%,#ffb07a 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.lib-banner-cap{position:absolute;right:14px;bottom:10px;margin:0;z-index:1;font-family:ui-monospace,'SF Mono',Menlo,Consolas,monospace;font-size:.64rem;letter-spacing:.06em;color:var(--text-dim);max-width:60%;text-align:right}
@media (max-width:990px){
  .lib-hero-fade{background:linear-gradient(180deg,rgba(11,15,22,.88) 0%,rgba(11,15,22,.66) 100%)}
}
@media (max-width:640px){
  .lib-hero{min-height:0}
  .lib-hero .lib-head{padding:16px 16px 44px}
  .lib-banner-cap{left:16px;right:16px;max-width:none;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
}

/* ── Polish: sticky bar, search hint, active chips, show-results, empty state, courses ── */
.lib-sentinel{height:1px;margin-top:-1px}
.lib-bar{transition:box-shadow .2s}
.lib-bar.is-stuck{box-shadow:0 10px 18px -16px rgba(0,0,0,.9);border-bottom-color:#36406a}
.lib-kbd{position:absolute;right:10px;top:50%;transform:translateY(-50%);font:600 .7rem ui-monospace,Menlo,monospace;color:var(--text-dim);border:1px solid var(--border);border-radius:4px;padding:1px 6px;pointer-events:none}
.lib-search input:focus ~ .lib-kbd,.lib-search input:not(:placeholder-shown) ~ .lib-kbd{display:none}
@media (pointer:coarse){.lib-kbd{display:none}}
.lib-active{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px}
.lib-chip{display:inline-flex;align-items:center;gap:8px;min-height:32px;padding:4px 6px 4px 12px;border:1px solid rgba(79,142,247,.45);border-radius:99px;background:rgba(79,142,247,.1);color:#dde3f0;font:inherit;font-size:.8rem;cursor:pointer}
.lib-chip:hover{background:rgba(79,142,247,.2)}
.lib-chip-x{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:rgba(255,255,255,.08);font-size:.9rem;line-height:1}
.lib-chip-clear{min-height:32px;padding:4px 10px;border:0;background:none;color:#9fbdf9;font:inherit;font-size:.8rem;text-decoration:underline;text-underline-offset:2px;cursor:pointer}
.lib-chip:focus-visible,.lib-chip-clear:focus-visible,.lib-show:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.lib-show{display:none}
@media (max-width:720px){
  .lib-show{display:block;position:sticky;bottom:12px;z-index:4;width:100%;margin-top:10px;min-height:44px;border:0;border-radius:10px;background:var(--accent);color:#fff;font:inherit;font-weight:700;box-shadow:0 10px 24px -10px rgba(0,0,0,.8);cursor:pointer}
}
.lib-empty{padding:34px 20px}
.lib-empty-h{margin:0;font-size:1.02rem;color:var(--text)}
.lib-empty-sub{margin:6px 0 0;color:var(--text-dim);font-size:.88rem}
.lib-courses{margin-top:56px}
.lib-courses h2{font-size:1.25rem;margin:0}
.lib-courses-lede{color:var(--text-dim);margin:6px 0 16px}
.lib-course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.lib-course{border:1px solid var(--border);border-radius:12px;padding:14px 16px;background:rgba(22,27,39,.7)}
.lib-course h3{margin:0;font-size:.95rem;color:var(--text)}
.lib-course p{margin:6px 0 10px;color:var(--text-dim);font-size:.82rem;line-height:1.5}
.lib-course ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.lib-course a{display:inline-flex;align-items:center;min-height:30px;padding:4px 10px;border:1px solid var(--border);border-radius:99px;color:#c4cbe0;font-size:.78rem;text-decoration:none}
.lib-course a:hover,.lib-course a:focus-visible{border-color:var(--accent);color:#fff}

/* ── Bottom index: one collapsible group per subject, topics inside (plain HTML for crawlers) ── */
.lib-index-lede{color:var(--text-dim);margin:6px 0 16px;font-size:.9rem}
.lib-index-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px;align-items:start}
.lib-index-group{border:1px solid var(--border);border-radius:12px;background:rgba(22,27,39,.6)}
.lib-index-group[open]{background:rgba(22,27,39,.9);border-color:#36406a}
.lib-index-group summary{display:flex;align-items:center;gap:10px;min-height:48px;padding:10px 14px;cursor:pointer;list-style:none;border-radius:12px}
.lib-index-group summary::-webkit-details-marker{display:none}
.lib-index-group summary::after{content:"";margin-left:auto;width:8px;height:8px;border-right:1.5px solid var(--text-dim);border-bottom:1.5px solid var(--text-dim);transform:rotate(45deg) translateY(-2px);transition:transform .15s}
.lib-index-group[open] summary::after{transform:rotate(-135deg) translateY(-2px)}
.lib-index-group summary:hover h3{color:#fff}
.lib-index-group summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.lib-index-group h3{margin:0;font-size:.92rem;font-weight:600;color:var(--text)}
.lib-index-n{font-family:ui-monospace,Menlo,monospace;font-size:.75rem;color:var(--text-dim)}
.lib-index-body{padding:0 14px 12px}
.lib-index-group h4{margin:12px 0 4px;font:600 .66rem ui-monospace,Menlo,Consolas,monospace;letter-spacing:.08em;text-transform:uppercase;color:#7f8db0}
.lib-index-group ul{list-style:none;padding:0;margin:0}
.lib-index-group a{display:block;padding:3px 0;color:#b4bdd4;font-size:.85rem;text-decoration:none}
.lib-index-group a:hover,.lib-index-group a:focus-visible{color:#fff;text-decoration:underline}
@media (prefers-reduced-motion:reduce){.lib-index-group summary::after{transition:none}}

/* ═══ Phone optimisation (2026-10-10). Everything below is inside phone/touch media
   queries, so the desktop layout is untouched (asserted by a full layout diff at 1280px). ═══ */
@media (max-width:640px){
  .lib{padding:60px 14px 40px}
  /* header: one-line title block, tighter type */
  .lib-tb{font-size:.7rem;margin-bottom:12px}
  .lib-tb div:first-child,.lib-tb div:last-child{display:none}
  .lib-tb div{padding:6px 10px}
  .lib-crumbs{font-size:.78rem}
  .lib h1{font-size:1.85rem;margin:6px 0 8px;line-height:1.12}
  .lib-lede{font-size:.94rem;line-height:1.5}
  .lib-stats{margin-top:12px;gap:16px;font-size:.8rem}
  .lib-stats b{font-size:1.05rem}
  .lib-banner-cap{font-size:.7rem}
  /* search bar */
  .lib-bar{margin:16px 0 12px;padding:8px 0;gap:8px}
  .lib-search{flex-basis:100%}
  .lib-seg{flex:1 1 auto}
  .lib-seg button{flex:1 1 auto}
  /* cards: compact, readable */
  .lib-grid{gap:8px}
  .lib-card{padding:10px;gap:10px}
  .lib-card img{width:44px;height:44px;border-radius:7px}
  .lib-card h3{font-size:.95rem}
  .lib-card-desc{font-size:.82rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:6px}
  .lib-tag{font-size:.72rem;padding:2px 6px}
  .lib-col-h{font-size:.72rem}
  .lib-also{margin-top:6px}
  .lib-also span{display:inline;margin-right:4px}
  .lib-also button{display:inline;min-height:28px;padding:4px 0;margin-right:10px}
  .lib-more{display:block;width:100%;min-height:48px;margin:12px 0 0;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);font:inherit;font-weight:600;cursor:pointer}
  .lib-more:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
  /* index + courses */
  .lib-index-group h4{font-size:.72rem}
  .lib-index-group a{padding:6px 0;font-size:.9rem}
  .lib-courses{margin-top:40px}
  .lib-index{margin-top:40px}
  .lib-article{margin-top:36px}
}
@media (max-width:500px){
  /* subject map: shorter tiles, smaller glyph */
  .lib-tile{min-height:86px;padding:10px 10px 8px}
  .lib-tile-name{font-size:.86rem;line-height:1.2}
  .lib-tile-count{font-size:1.3rem;margin-top:4px}
  .lib-tile-no{font-size:.68rem;top:8px;right:8px}
  .lib-tile canvas{width:52px;height:34px;right:8px;bottom:8px}
}
@media (pointer:coarse) and (max-width:720px){
  .lib-opt{min-height:44px}
  .lib-steps button{min-height:44px}
  .lib-seg button{min-height:44px}
  .lib-chip,.lib-chip-clear{min-height:40px}
  .lib-crumbs a{display:inline-flex;align-items:center;min-height:32px}
  .lib-course a{min-height:36px}
  .lib-index-group a{min-height:36px;display:flex;align-items:center}
}
.lib-more{display:none}
@media (max-width:640px){.lib-more{display:block}}
@media (max-width:640px){
  .lib-card-desc{-webkit-line-clamp:2}
  .lib-results[data-all="1"] .lib-also{display:none}
}
@media (max-width:500px){
  .lib-tb div:nth-child(2){display:none}
}
@media (pointer:coarse) and (max-width:720px){
  .lib-crumbs{align-items:center}
}