/* Donat Sciences and Maths · simulations and virtual labs (shared styles) */
.sim-tags{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 0;padding:0;list-style:none}
.sim-tags li{font-size:13.5px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--blue-soft);color:var(--ink)}
.sim-free{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:999px;background:#1e8e3e;color:#fff;margin-left:6px;vertical-align:middle}
.sim-stage{display:grid;gap:14px;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);align-items:start}
@media (max-width:820px){.sim-stage{grid-template-columns:1fr}}
.sim-card{background:var(--surface);border:1.5px solid var(--line);border-radius:16px;padding:12px;min-width:0}
.sim-card h2,.sim-card h3{font-size:19px;margin:2px 0 10px}
.sim-view{position:relative;width:100%;height:clamp(260px,58vw,420px);border-radius:12px;overflow:hidden;background:var(--surface);touch-action:manipulation}
.sim-view canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.sim-read{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:8px;margin-top:10px}
.sim-read div{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:8px 10px;min-width:0}
.sim-read small{display:block;font-size:12.5px;color:var(--ink-soft);font-weight:700;line-height:1.25}
.sim-read b{display:block;font-family:var(--mono);font-size:19px;line-height:1.3;overflow-wrap:anywhere}
.sim-ctl{display:grid;gap:12px}
.sim-sl{display:grid;gap:4px}
.sim-sl .top{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-weight:700;font-size:15.5px}
.sim-sl .top output{font-family:var(--mono);font-size:15px;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:2px 8px;white-space:nowrap}
.sim-sl .row{display:grid;grid-template-columns:44px 1fr 44px;gap:8px;align-items:center}
.sim-sl .row button{height:44px;border-radius:12px;border:1.5px solid var(--line);background:var(--bg);color:var(--ink);font-size:22px;font-weight:700;line-height:1;cursor:pointer}
.sim-sl input[type=range]{width:100%;height:44px;margin:0;accent-color:var(--accent);background:transparent}
.sim-ch{display:grid;gap:6px}
.sim-ch .lab{font-weight:700;font-size:15.5px}
.sim-ch .opts{display:flex;flex-wrap:wrap;gap:6px}
.sim-ch .opts button{min-height:42px;padding:6px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-size:15px;font-weight:600;cursor:pointer}
.sim-ch .opts button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink,#fff)}
.sim-btns{display:flex;flex-wrap:wrap;gap:8px}
.sim-btns button{min-height:46px;padding:8px 14px;border-radius:12px;border:2px solid var(--accent);background:var(--surface);color:var(--ink);font:inherit;font-weight:700;cursor:pointer}
.sim-btns button.main{background:var(--accent);color:var(--accent-ink,#fff)}
.sim-btns button:disabled{opacity:.45;cursor:not-allowed}
.sim-note{font-size:14.5px;color:var(--ink-soft);margin:6px 0 0;line-height:1.45}
.sim-msg{min-height:1.4em;font-weight:700;margin:6px 0 0}
.vlab{display:grid;gap:14px;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start}
@media (max-width:820px){.vlab{grid-template-columns:1fr}}
.vlab ol.steps{margin:0;padding-left:22px;display:grid;gap:6px}
.sim-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:12px}
table.sim-table{border-collapse:collapse;width:100%;font-size:15px;min-width:280px}
table.sim-table th,table.sim-table td{padding:7px 9px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
table.sim-table th{background:var(--blue-soft);text-align:right;font-size:13.5px}
table.sim-table td:first-child,table.sim-table th:first-child{text-align:left}
table.sim-table tr:last-child td{border-bottom:0}
.sim-graph{position:relative;width:100%;height:clamp(230px,55vw,330px)}
.sim-graph canvas{position:absolute;inset:0;width:100%;height:100%}
.sim-result{background:color-mix(in srgb,#1e8e3e 12%,var(--surface));border:1.5px solid color-mix(in srgb,#1e8e3e 45%,var(--line));border-radius:12px;padding:10px 12px;margin-top:10px;line-height:1.5}
.sim-qs details{border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--surface);margin:0 0 8px}
.sim-qs summary{cursor:pointer;font-weight:700;line-height:1.4}
.sim-qs details p{margin:8px 0 0}
.sim-links{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.sim-links a{display:block;padding:12px 14px;border:1.5px solid var(--line);border-radius:14px;background:var(--surface);text-decoration:none;font-weight:700;min-height:48px}
.sim-links a small{display:block;font-weight:400;color:var(--ink-soft);margin-top:2px}
.sim-ctx{border-left:5px solid var(--accent);background:var(--surface);border-radius:0 12px 12px 0;padding:10px 14px;margin:0;line-height:1.5}
.sim-hub{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.sim-hub a.simcard{display:flex;flex-direction:column;gap:6px;padding:14px;border:1.5px solid var(--line);border-radius:16px;background:var(--surface);text-decoration:none;color:var(--ink)}
.sim-hub a.simcard b{font-family:var(--display);font-size:19px;color:var(--blue)}
.sim-hub a.simcard span{color:var(--ink-soft);line-height:1.45}
.sim-hub a.simcard em{font-style:normal;font-size:13px;font-weight:700;color:var(--ink-soft)}
.sim-hub .simsoon{padding:14px;border:1.5px dashed var(--line);border-radius:16px;color:var(--ink-soft)}
.sim-sec{padding-block:18px}
.sim-sec>.wrap>h2{font-size:24px;margin:0 0 12px}
@media print{.sim-ctl,.sim-btns,.sim-view{display:none!important}}
/* hub cards and page actions (v2) */
.sim-hub{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.sim-hub article.simcard{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1.5px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);min-width:0}
.simthumb{flex:0 0 72px;width:72px;height:60px;color:var(--blue);background:var(--blue-soft);border-radius:12px;padding:4px}
.simcard-b{min-width:0;flex:1}
.simcard h2{font-family:var(--display);font-size:19px;margin:0 0 4px;line-height:1.2}
.simcard h2 a{color:var(--blue);text-decoration:none}
.simcard p{margin:0 0 6px;color:var(--ink-soft);line-height:1.45}
.simmeta{list-style:none;margin:0 0 8px;padding:0;font-size:14px;line-height:1.45;color:var(--ink-soft)}
.simmeta b{color:var(--ink)}
b.ok{color:#1e8e3e}
.sim-act{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.sim-go{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:8px 14px;border-radius:12px;background:#1e8e3e;color:#fff !important;font:inherit;font-weight:800;text-decoration:none;border:0;cursor:pointer;flex:1 1 150px;text-align:center}
.sim-go.lab{background:var(--surface);color:var(--blue) !important;border:2px solid var(--blue)}
.sim-go:focus-visible{outline:3px solid #f0b400;outline-offset:2px}
.sim-info{margin-top:14px}
.sim-facts{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));margin:12px 0 0}
.sim-facts>div{background:var(--surface);border:1.5px solid var(--line);border-radius:12px;padding:8px 12px}
.sim-facts .wide{grid-column:1/-1}
.sim-facts dt{font-weight:800;font-size:14px}
.sim-facts dd{margin:2px 0 0;color:var(--ink-soft);line-height:1.45}
.sim-facts ul{margin:0;padding-left:18px}
.sim-tags li.also{background:transparent;border:1.5px solid var(--line);font-weight:600}
.sim-tags li small{font-weight:500;color:var(--ink-soft)}
.sim-sugg{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-top:14px;padding:14px;border-radius:16px;background:var(--accent-soft, #fff6d6);border:1.5px solid #f0d27a}
.sim-sugg div{flex:1 1 220px}.sim-sugg span{display:block;color:var(--ink-soft)}
.sim-sugg .sim-go{flex:0 1 auto}
#sim,#vlab{scroll-margin-top:12px}
@media (max-width:520px){
  .sim-hub article.simcard{flex-direction:column}
  .simthumb{width:100%;height:96px;flex-basis:auto;padding:6px}
}
/* exam set, worksheet, projector (premium-ready) */
.sim-qs .mk{font-weight:600;color:var(--ink-soft);font-size:.9em;white-space:nowrap}
.sim-exam{background:#b7791f}
#sim:fullscreen{background:var(--bg);overflow:auto;padding:12px}
#sim:fullscreen .sim-view,#sim.sim-big .sim-view{height:min(72vh,900px) !important}
#sim:fullscreen .sim-stage{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}
.ws-sheet{display:none}
@media print{
  html.ws-print body>*:not(.ws-on){display:none !important}
  html.ws-print body>.ws-sheet.ws-on{display:block !important}
  html.ws-print body>.ws-sheet:not([hidden]){display:block !important}
}
.ws-sheet{font:11pt/1.45 var(--act,"Bookman Old Style",Georgia,serif);color:#000;background:#fff;padding:6mm 4mm}
.ws-sheet h1{font-size:15pt;margin:4mm 0 2mm;font-family:inherit}
.ws-sheet h3{font-size:12pt;margin:4mm 0 1.5mm;border-bottom:1px solid #999;padding-bottom:1mm;font-family:inherit}
.ws-top{display:flex;gap:8px;align-items:center;border-bottom:2px solid #0a68a6;padding-bottom:2mm}
.ws-top b{display:block;font-size:13pt;color:#0b3d6e}.ws-top span{font-size:10pt;color:#1e8e3e}
.ws-id{font-size:10pt;margin:3mm 0}
.ws-table{border-collapse:collapse;width:100%;font-size:10pt}
.ws-table th,.ws-table td{border:1px solid #444;padding:4px 6px;height:7mm;text-align:center}
.ws-grid{display:block;width:100%;height:90mm}
.ws-keep{break-inside:avoid}
.ws-q li{margin:0 0 3mm;break-inside:avoid}
.ws-lines i{display:block;border-bottom:1px dotted #666;height:7mm}
.ws-ans{margin:1mm 0 0;padding:2mm;border:1px solid #9bc4a8;background:#f2faf4}
.ws-foot{margin-top:6mm;font-size:9pt;color:#555;border-top:1px solid #999;padding-top:1mm}
.ws-note{font-size:10pt;margin:0 0 2mm}

/* clearer text for every simulation (Atkinson Hyperlegible, SIL Open Font License, self-hosted) */
@font-face{font-family:'Atkinson Hyperlegible';font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/atkinson-hyperlegible-latin-400-normal.woff2) format('woff2')}
@font-face{font-family:'Atkinson Hyperlegible';font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/atkinson-hyperlegible-latin-700-normal.woff2) format('woff2')}
#sim,#vlab,.sim-qs,.sim-hub{font-family:'Atkinson Hyperlegible',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
.sim-read b{font-size:1.06em;letter-spacing:.01em}
.sim-msg{font-size:1.02em;line-height:1.45}
@media (max-width:520px){
  .sim-stage>.sim-card:first-child{margin-inline:-10px;padding:3px;border-radius:12px}
  .sim-stage>.sim-card:first-child .sim-view{border-radius:10px}
}

/* ---- the lab stays on screen: picture, action buttons, message and readings together; controls scroll under ---- */
.sim-stage>.sim-card:first-child{position:sticky;top:6px;z-index:6;box-shadow:0 6px 18px rgba(8,30,52,.12)}
.sim-stage>.sim-card:first-child .sim-btns{margin-top:8px}
.sim-stage>.sim-card:first-child .sim-msg{margin:6px 2px 0}
.sim-pinhint{display:none}
@media (min-width:821px){
  .sim-stage>.sim-card:first-child .sim-view{max-height:calc(100vh - 300px);min-height:260px}
  .sim-stage>.sim-card:first-child .sim-read{grid-template-columns:repeat(auto-fit,minmax(104px,1fr));gap:6px;margin-top:8px}
  .sim-stage>.sim-card:first-child .sim-read div{padding:5px 9px}
  .sim-stage>.sim-card:first-child .sim-read b{font-size:17px}
}
@media (max-width:820px){
  .sim-stage>.sim-card:first-child{top:0;border-radius:0 0 14px 14px}
  .sim-stage>.sim-card:first-child .sim-view{height:min(82vw,40vh)!important;min-height:220px}
  .sim-stage>.sim-card:first-child .sim-btns{flex-wrap:nowrap;overflow-x:auto;gap:6px;padding-bottom:2px;scrollbar-width:thin}
  .sim-stage>.sim-card:first-child .sim-btns button{flex:0 0 auto;min-height:40px;padding:6px 12px;font-size:14.5px;border-radius:10px}
  .sim-stage>.sim-card:first-child .sim-msg{font-size:14px;line-height:1.35;max-height:4.1em;overflow:auto}
  .sim-stage>.sim-card:first-child .sim-read{display:flex;overflow-x:auto;gap:6px;margin-top:6px;scrollbar-width:thin}
  .sim-stage>.sim-card:first-child .sim-read div{flex:0 0 auto;padding:4px 9px;border-radius:10px;max-width:62vw}
  .sim-stage>.sim-card:first-child .sim-read small{font-size:11.5px;white-space:nowrap}
  .sim-stage>.sim-card:first-child .sim-read b{font-size:16px;white-space:nowrap;overflow-wrap:normal}
  .sim-pinhint{display:block;font-size:12.5px;color:var(--ink-soft);margin:0 0 8px}
}
/* phone held sideways: picture beside the controls */
@media (max-width:920px) and (orientation:landscape) and (max-height:560px){
  .sim-stage{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}
  .sim-stage>.sim-card:first-child{top:0}
  .sim-stage>.sim-card:first-child .sim-view{height:calc(100vh - 150px)!important;min-height:180px}
  .sim-stage>.sim-card:first-child .sim-read{display:none}
  .sim-stage>.sim-card:first-child .sim-msg{max-height:2.8em;overflow:auto;font-size:14px}
  .sim-stage>.sim-card:first-child .sim-btns button{min-height:38px;padding:5px 11px;font-size:14px}
}
/* very short screens: do not pin (it would cover everything) */
@media (max-height:420px) and (orientation:portrait){.sim-stage>.sim-card:first-child{position:static}}

#sim button,#sim label,#sim output,#vlab button,#exam,#tools{font-family:'Atkinson Hyperlegible',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
@media (max-width:820px){
  #ctl .sim-ch .opts{gap:6px}
  #ctl .sim-ch .opts button{min-height:38px;padding:5px 11px;font-size:14.5px;line-height:1.25}
  #ctl .sim-sl{margin-bottom:4px}
}

/* simulation pages: the site menu scrolls away, so the lab can use the whole screen */
header.top{position:static!important}

.sim-jump{display:inline-block;margin-top:8px;font-weight:700;font-size:14px;color:var(--accent);text-decoration:none}
.sim-jump:hover{text-decoration:underline}
@media (max-width:820px){.sim-jump{margin-top:4px;font-size:13px}}

/* previous / next simulation */
.sim-nav{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;margin-top:16px;align-items:stretch}
.sim-nav a{display:flex;flex-direction:column;justify-content:center;gap:2px;padding:10px 14px;border-radius:14px;border:2px solid var(--accent);background:var(--surface);color:var(--ink);text-decoration:none;min-height:56px;min-width:0}
.sim-nav a:hover{background:var(--accent);color:var(--accent-ink,#fff)}
.sim-nav a:hover small{color:inherit}
.sim-nav small{font-size:13px;font-weight:700;color:var(--accent)}
.sim-nav b{font-size:15px;line-height:1.25;overflow-wrap:anywhere}
.sim-nav .next{text-align:right;align-items:flex-end}
.sim-nav .all{text-align:center;align-items:center;border-style:dashed;max-width:210px}
@media (max-width:620px){
  .sim-nav{grid-template-columns:1fr 1fr}
  .sim-nav .all{grid-column:1 / -1;grid-row:2;max-width:none;min-height:44px}
  .sim-nav b{font-size:14px}
}
@media print{.sim-nav{display:none}}