[hidden]{display:none!important}
body{margin:0}
/* Layout: fixed ink sidebar + scrolling workspace; sidebar becomes a top tab strip on phones */
:root{
  --bg:#f3f5f4; --surface:#ffffff; --ink:#16231f; --muted:#5d6b66; --line:#dde3e0;
  --side:#14261f; --side-fg:#cfdcd6; --side-mute:#7f958c;
  --accent:#1f7a5a; --accent-soft:#e1f1ea; --accent-fg:#ffffff;
  --ok:#1f7a5a; --ok-bg:#dcf1e6; --warn:#9a6200; --warn-bg:#fdefd2; --bad:#b3261e; --bad-bg:#fbe1de; --none:#6d7a75; --none-bg:#eceff0;
  --display:"Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body:"Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --r:10px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0f1714; --surface:#17221e; --ink:#e6eeea; --muted:#9aaba4; --line:#2a3833;
  --side:#0a110e; --side-fg:#c9d7d1; --side-mute:#6f857c;
  --accent:#4fbf93; --accent-soft:#1d3a2f; --accent-fg:#06140e;
  --ok:#5fd0a2; --ok-bg:#183a2c; --warn:#f0b54a; --warn-bg:#3a2d12; --bad:#ff8a80; --bad-bg:#43201d; --none:#9aa7a2; --none-bg:#25302c;
  color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0f1714; --surface:#17221e; --ink:#e6eeea; --muted:#9aaba4; --line:#2a3833;
  --side:#0a110e; --side-fg:#c9d7d1; --side-mute:#6f857c;
  --accent:#4fbf93; --accent-soft:#1d3a2f; --accent-fg:#06140e;
  --ok:#5fd0a2; --ok-bg:#183a2c; --warn:#f0b54a; --warn-bg:#3a2d12; --bad:#ff8a80; --bad-bg:#43201d; --none:#9aa7a2; --none-bg:#25302c;
  color-scheme:dark}
html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.5}
*{box-sizing:border-box}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.app{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100%}
aside{background:var(--side);color:var(--side-fg);padding-block:20px;display:flex;flex-direction:column;gap:18px;position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{display:flex;align-items:center;gap:10px;padding-inline:20px;font-family:var(--display);font-weight:700;font-size:18px;color:#fff}
.brand-mark{width:32px;height:32px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:var(--accent-fg);font-size:15px}
.navgroup{display:flex;flex-direction:column;gap:2px}
.navlabel{padding-inline:20px;font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--side-mute);margin-bottom:4px}
.nav{background:none;border:0;text-align:left;padding:8px 20px;color:var(--side-fg);border-left:3px solid transparent;display:flex;align-items:center;gap:10px}
.nav:hover{background:rgba(255,255,255,.05)}
.nav[aria-current="page"]{border-left-color:var(--accent);background:rgba(255,255,255,.07);color:#fff;font-weight:700}
.nav svg{width:17px;height:17px;flex:none;opacity:.85}
main{display:flex;flex-direction:column;min-width:0}
.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:14px 28px;background:var(--surface);border-bottom:1px solid var(--line)}
.crumb h1{font-family:var(--display);font-size:22px;margin:0;text-wrap:balance}
.crumb p{margin:0;color:var(--muted);font-size:13px}
.who{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.toggle{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.switch{width:42px;height:24px;border-radius:12px;border:1px solid var(--line);background:var(--none-bg);position:relative;padding:0}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:var(--surface);box-shadow:0 1px 2px rgba(0,0,0,.3);transition:left .15s}
.switch[aria-checked="true"]{background:var(--accent);border-color:var(--accent)}
.switch[aria-checked="true"]::after{left:20px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:700}
.content{padding:24px 28px 40px;display:flex;flex-direction:column;gap:20px}
.example{font-size:12px;color:var(--warn);background:var(--warn-bg);padding:6px 12px;border-radius:6px;align-self:flex-start}
.kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.kpi{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.kpi span{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.kpi b{font-family:var(--display);font-size:30px;font-variant-numeric:tabular-nums;line-height:1.1}
.kpi small{color:var(--muted)}
.grid2{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:14px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;flex-direction:column;gap:12px;min-width:0}
.panel h2{font-family:var(--display);font-size:17px;margin:0}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.muted{color:var(--muted)}
.list{display:flex;flex-direction:column}
.row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-top:1px solid var(--line)}
.row:first-child{border-top:0}
.pill{display:inline-block;font-size:12px;font-weight:700;padding:2px 9px;border-radius:999px;white-space:nowrap}
.s-ok{background:var(--ok-bg);color:var(--ok)} .s-due{background:var(--warn-bg);color:var(--warn)} .s-exp{background:var(--bad-bg);color:var(--bad)} .s-none{background:var(--none-bg);color:var(--none)}
.btn{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:7px 14px;font-weight:700}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.tablewrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);font-weight:700}
.matrix th.c{writing-mode:vertical-rl;transform:rotate(180deg);height:150px;vertical-align:bottom;text-transform:none;letter-spacing:0;font-size:12px}
.matrix td.c{text-align:center;padding:5px}
.cell{display:block;width:30px;height:24px;border-radius:5px;margin:auto}
.legend{display:flex;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--muted)}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.search{border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:7px 12px;min-width:0;width:240px;max-width:100%}
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.course{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:8px}
.course h3{margin:0;font-family:var(--display);font-size:16px}
.meta{display:flex;flex-wrap:wrap;gap:6px;font-size:12px}
.meta span{background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:1px 7px;color:var(--muted)}
.course .btn{margin-top:auto;align-self:flex-start}
.bar{height:10px;background:var(--none-bg);border-radius:5px;overflow:hidden}
.bar > div{height:100%;background:var(--accent)}
.rep{display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr) 54px;gap:12px;align-items:center;padding:7px 0}
.rep b{text-align:right;font-variant-numeric:tabular-nums}
.form{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;align-items:end}
.form label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}
.form input,.form select{border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:8px 10px}
.toast{position:fixed;bottom:calc(20px + env(safe-area-inset-bottom,0px));left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:8px;font-weight:700}
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;padding:16px}
.modal{background:var(--surface);border-radius:12px;padding:20px;width:min(460px,100%);max-height:85vh;overflow:auto;display:flex;flex-direction:column;gap:12px}
.modal h2{margin:0;font-family:var(--display);font-size:19px}
.checks{display:flex;flex-direction:column;gap:6px}
.checks label{display:flex;gap:10px;align-items:center}
.actions{display:flex;gap:10px;justify-content:flex-end}
.progress{display:flex;align-items:center;gap:10px}
.progress .bar{flex:1}
svg.chart text{fill:var(--muted);font-size:11px;font-family:var(--body)}
@media (max-width:900px){.kpis{grid-template-columns:repeat(2,minmax(0,1fr))}.grid2{grid-template-columns:minmax(0,1fr)}}
@media (max-width:720px){
  .app{grid-template-columns:minmax(0,1fr)}
  aside{position:static;height:auto;flex-direction:row;overflow-x:auto;padding:10px 16px;gap:4px;align-items:center}
  .navlabel{display:none} .navgroup{flex-direction:row;gap:2px}
  .brand{padding-inline:0 10px} .brand span{display:none}
  .nav{border-left:0;border-bottom:3px solid transparent;padding:8px 10px;white-space:nowrap}
  .nav[aria-current="page"]{border-bottom-color:var(--accent)}
  .topbar,.content{padding-inline:16px}
  .rep{grid-template-columns:minmax(0,1fr) 54px}.rep .bar{grid-column:1 / -1;grid-row:2}
}
.player{height:100%;min-height:100vh;background:#262626;color:#eee;display:flex;flex-direction:column;--pa:#c8174f;--pb:#164f7f}
.ph{display:flex;align-items:center;gap:14px;padding:10px 18px;padding-top:calc(10px + env(safe-area-inset-top,0px))}
.ph .ptitle{font-size:15px;color:#ddd;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ph .sp{flex:1}
.ic{background:none;border:0;color:#eee;font-size:18px;padding:4px 8px;border-radius:6px}
.ic:disabled{opacity:.35;cursor:default}
.lnk{background:none;border:0;color:#fff;font-weight:700;font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding:6px}
.pstage{flex:1;position:relative;display:flex;align-items:center;justify-content:center;padding:0 16px;min-height:0}
.slide{width:min(1100px,100%);aspect-ratio:16/9;max-height:calc(100vh - 120px);background:var(--pb);display:flex;overflow:auto}
.sl-title{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;position:relative}
.sl-card{background:#fff;color:var(--pb);width:min(540px,70%);padding:28px 24px 70px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px;clip-path:polygon(0 0,100% 0,100% 100%,50% 78%,0 100%)}
.brand-mark.big{width:64px;height:64px;font-size:24px;border-radius:14px}
.sl-card h1{margin:0;font-family:var(--display);font-weight:500;font-size:clamp(22px,4vw,44px);text-wrap:balance}
.sl-card p{margin:0;color:var(--pa);font-size:clamp(17px,2.6vw,28px)}
.sl-begin{margin-top:-20px;background:var(--pa);color:#fff;border:0;border-radius:6px;font-weight:700;font-size:clamp(18px,2.4vw,28px);padding:14px 0;width:min(280px,50%);position:relative}
.sl-body{flex:1;background:#fff;color:#1d2a35;margin:4%;padding:clamp(16px,3vw,36px);display:flex;flex-direction:column;gap:12px;overflow:auto}
.sl-body.center{align-items:center;justify-content:center;text-align:center}
.sl-body.center svg{width:60px;height:60px;color:#1f7a5a}
.sl-body h2{margin:0;font-family:var(--display);color:var(--pb);font-size:clamp(20px,3vw,32px)}
.sl-body p{margin:0;max-width:65ch}
.sl-body ul{margin:0;padding-left:20px}
.sl-media{background:#e9eef3;border-radius:8px;min-height:120px;flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:#4a5b6a}
.sl-media svg{width:40px;height:40px}
.sl-body .opt{border:1px solid #cfd8e0;border-radius:8px;padding:10px 14px}
.sl-btn{background:var(--pa);color:#fff;border:0;border-radius:6px;font-weight:700;padding:10px 22px}
.err{color:#b3261e}
.drawer{position:absolute;top:0;left:0;bottom:0;width:min(300px,85%);background:#1b1b1b;padding:12px;display:flex;flex-direction:column;gap:4px;z-index:3;overflow:auto}
.drawer.right{left:auto;right:0}
.drawer p{color:#bbb;margin:6px 0 0}
.dl{background:none;border:0;color:#ddd;text-align:left;padding:10px 12px;border-radius:6px}
.dl.on{background:#333;color:#fff;font-weight:700}
.dl:disabled{opacity:.4}
.pf{display:flex;align-items:center;gap:10px;padding:10px 18px;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px))}
.track{flex:1;height:4px;background:#444;border-radius:2px;overflow:hidden}
.track div{height:100%;background:#4a90d9}
.cnt{font-size:12px;color:#aaa;font-variant-numeric:tabular-nums}
.lnk:disabled{opacity:.35;cursor:default}
.sl-head{display:flex;align-items:center;gap:14px}
.sl-head .brand-mark{width:44px;height:44px;flex:none}
.ov{position:relative;gap:16px}
.ov-strap{border:2px solid var(--pb);color:var(--pa);padding:8px 16px;font-size:clamp(15px,2vw,22px)}
.ov-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 28px}
.ov-step{display:flex;align-items:center;gap:12px;background:none;border:0;padding:0;text-align:left;color:var(--pb);font-size:clamp(14px,1.8vw,20px)}
.ov-step .die{width:clamp(48px,7vw,80px);height:clamp(48px,7vw,80px);flex:none;border:2px solid #f4a58a;border-radius:14px;padding:6px}
.ov-step .die circle{fill:#f9b393}
.ov-step span{flex:1;border:2px solid #f4a58a;border-radius:14px;padding:10px 14px;min-height:clamp(48px,7vw,80px);display:flex;align-items:center}
.ov-step:hover span{background:#fff4ee}
.ov-step:last-child{grid-column:1 / -1;justify-self:center;width:min(100%,460px)}
.ov-foot{display:flex;justify-content:space-between}
.round{width:46px;height:46px;border-radius:50%;background:var(--pb);color:#fff;border:0;font-weight:700;font-size:22px;font-family:Georgia,serif}
.ov-tip{position:absolute;left:24px;bottom:80px;max-width:320px;background:var(--pb);color:#fff;padding:12px 14px;border-radius:8px}
@media (max-width:720px){.ov-grid{grid-template-columns:minmax(0,1fr)}}
.slide:has(.sl-lesson){background:transparent}
.sl-lesson{flex:1;background:#fff;color:var(--pb);margin:6% 0;display:flex;flex-direction:column;overflow:auto}
.ls-head{display:flex;gap:14px;align-items:flex-start;padding:16px 20px;border-bottom:1px solid var(--pb)}
.ls-head .brand-mark{width:44px;height:44px;flex:none}
.ls-head h2{margin:0;font-family:var(--display);font-weight:500;font-size:clamp(20px,3vw,32px)}
.ls-head p{margin:4px 0 0;font-size:clamp(13px,1.5vw,16px)}
.ls-split{flex:1;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.ls-split ol{margin:0;padding:14px 20px 14px 42px;display:flex;flex-direction:column;gap:4px;font-size:clamp(13px,1.6vw,18px);border-right:1px solid var(--pb)}
.ls-pic{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:#8aa0b4;background:#f3f6f9}
.ls-pic svg{width:72px;height:72px}
@media (max-width:720px){.ls-split{grid-template-columns:minmax(0,1fr)}.ls-split ol{border-right:0}.ls-pic{min-height:120px}}
.ls-split.case{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr)}
.cs-tabs{display:flex;flex-direction:column;justify-content:center;gap:10px;padding:18px 24px}
.cs-tab{background:var(--pb);color:#fff;border:0;border-radius:8px;padding:14px;font-weight:700;font-size:clamp(14px,1.6vw,18px)}
.cs-tab.on{background:var(--pa)}
.cs-text{background:#f3f6f9;color:#1d2a35;border-radius:8px;padding:12px 14px;font-size:clamp(13px,1.5vw,16px)}
.q-bar{background:var(--pb);color:#fff;padding:14px 24px;border-left:6px solid #f4a58a;font-size:clamp(14px,1.8vw,19px)}
.q-opts{display:flex;flex-direction:column;gap:6px;padding:16px 28px}
.q-opt{display:flex;gap:10px;align-items:center;color:#1d2a35;font-size:clamp(14px,1.6vw,17px);padding:6px 8px;border-radius:6px}
.q-opt input{width:18px;height:18px}
.q-opt.right{background:#dcf1e6}
.q-opt.wrongo{background:#fbe1de}
.q-msg{margin:0 28px 18px;padding:10px 14px;border-radius:8px;color:#1d2a35}
.q-msg.right{background:#dcf1e6}.q-msg.wrong{background:#fbe1de}
.err.q-msg{color:#b3261e}
.sl-btn.small{padding:4px 12px;margin-left:8px;font-size:14px}
.sl-lesson{position:relative}
.fb-shade{position:absolute;inset:0;background:rgba(255,255,255,.65);display:grid;place-items:center;padding:16px}
.fb{background:#fff;border:1px solid #9aa5ae;box-shadow:0 6px 24px rgba(0,0,0,.18);padding:20px 28px;width:min(440px,100%);display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;color:#1d2a35}
.fb-icon{width:46px;height:46px;border-radius:50%;border:2px solid currentColor;display:grid;place-items:center;font-size:24px;font-weight:700}
.fb-icon.right{color:#2e7d32}.fb-icon.wrong{color:#b3261e}
.fb b{font-weight:400;color:#555}
.fb p{margin:0}
.fb-why{color:#555;font-size:14px}
.fb-btn{border:1px solid #555;background:#fff;padding:6px 28px;margin-top:6px;font-size:16px}
.fb-btn:hover{background:#f0f0f0}
.signin{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:32px 24px;max-width:460px;width:100%;margin:24px auto;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.signin h2{font-family:var(--display);margin:6px 0 0}
.signin p{margin:0}
.signin .small{font-size:13px;margin-top:8px}
.codeform{display:flex;gap:8px;width:100%;flex-wrap:wrap;justify-content:center;margin-top:8px}
.codeform input{flex:1;min-width:0;max-width:220px;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:10px 12px;font-size:20px;letter-spacing:.2em;text-align:center;font-variant-numeric:tabular-nums}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.code{font-family:ui-monospace,Consolas,monospace;font-weight:700;letter-spacing:.08em;background:var(--accent-soft);color:var(--accent);padding:2px 6px;border-radius:5px}
.btn.tiny{padding:2px 8px;font-size:12px}
.bigcode{font-family:ui-monospace,Consolas,monospace;font-size:34px;font-weight:700;letter-spacing:.25em;text-align:center;background:var(--accent-soft);color:var(--accent);border-radius:10px;padding:14px}
.err{color:var(--bad)}
.badge{margin-left:auto;background:var(--bad);color:#fff;border-radius:999px;font-size:11px;font-weight:700;padding:1px 7px}
.certview{align-items:center;text-align:center;border:6px double var(--accent)}
.certview h2{font-size:26px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.gate{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}
.gate .signin{margin:0}
.linkbtn{background:none;border:0;color:var(--accent);font-weight:700;text-decoration:underline;padding:4px}
.stack{display:flex;flex-direction:column;gap:10px;width:100%}
.stack input{border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:10px 12px}
.form .check{flex-direction:row;align-items:center;gap:8px;color:var(--ink)}
.empty{padding:28px;text-align:center;color:var(--muted)}
a.btn{text-decoration:none;color:inherit;display:inline-block}
a.btn.primary{color:var(--accent-fg)}
.who .lnk2{background:none;border:1px solid var(--line);border-radius:8px;padding:6px 12px;font-weight:700}
@media (max-width:720px){.app{grid-template-rows:auto minmax(0,1fr)}}
/* Rich course slides: cycle diagram, text panels, headed sections, matching */
.rs-center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:10px;gap:6px}
svg.cycle{width:min(100%,440px);height:auto;max-height:52vh}
.cy-node circle{stroke:#fff;stroke-width:2}
.cy0 circle{fill:var(--pa)}.cy1 circle{fill:#f4a58a}.cy2 circle{fill:#f07f7a}.cy3 circle{fill:var(--pb)}
.cy-node text{fill:#fff;font-family:var(--body);font-weight:700}
.cy1 text{fill:#3b1d10}
.cy-arrow{stroke:#f07f7a;stroke-width:4}.cy-head{fill:#f07f7a}
.rs-note{margin:0;color:#1d2a35;font-size:clamp(13px,1.5vw,16px);text-align:center;max-width:60ch}
.rs-quote{margin:12px 20px 0;padding:10px 16px;border-left:5px solid #f4a58a;background:#f3f6f9;color:#1d2a35;font-style:italic;font-size:clamp(13px,1.5vw,16px)}
.rs-panel{background:var(--pb);color:#fff;margin:14px 0 14px 20px;padding:16px 18px;border-radius:6px;display:flex;flex-direction:column;gap:8px;font-size:clamp(13px,1.5vw,16px)}
.rs-panel p{margin:0}
.rs-think{background:#fff;color:#1d2a35;border-radius:6px;padding:10px 12px;border:2px solid var(--pa)}
.rs-think p{margin:4px 0 0}
.rs-sections{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:14px 20px}
.rs-sections div{background:var(--pb);color:#fff;border-radius:6px;padding:12px 14px}
.rs-sections h3{margin:0 0 4px;font-family:var(--display);font-size:clamp(15px,1.8vw,19px);text-decoration:underline;text-underline-offset:3px}
.rs-sections p{margin:0;font-size:clamp(13px,1.5vw,16px)}
.rs-hint{margin:0;color:#1d2a35;font-weight:700}
.rs-done{margin:0;color:#2e7d32;font-weight:700;font-size:18px}
.mt-grid{display:grid;grid-template-columns:minmax(0,1fr) 50px minmax(0,1fr);gap:10px;padding:14px 20px;align-items:center}
.mt-col{display:flex;flex-direction:column;gap:8px}
.mt-arrow{font-size:34px;color:var(--pb);text-align:center;pointer-events:none}
.mt-card{background:var(--pb);color:#fff;border:3px solid transparent;border-radius:8px;padding:10px 12px;font-size:clamp(13px,1.5vw,16px)}
.mt-card.on{border-color:#f4a58a;box-shadow:0 0 0 3px rgba(244,165,138,.5)}
.mt-target{background:#fff;color:var(--pb);border:2px solid #9fb3c4;border-radius:8px;padding:12px;font-size:clamp(14px,1.6vw,18px);font-weight:700;min-height:48px}
.mt-target:not(:disabled):hover{border-color:var(--pa)}
.mt-target:disabled{cursor:default}
.mt-target.filled{background:var(--pb);color:#fff;border-color:var(--pb);display:flex;flex-direction:column;gap:2px;text-align:center}
.mt-target.filled span{font-weight:400;font-size:13px;opacity:.9}
.mt-help{padding:0 20px 14px}
@media (max-width:720px){.rs-sections{grid-template-columns:minmax(0,1fr)}.mt-grid{grid-template-columns:minmax(0,1fr)}.mt-arrow{transform:rotate(90deg);font-size:24px;line-height:1}.rs-panel{margin:14px 20px 0}}
/* Slides grow with their content and the stage scrolls, so long lessons are never cut off. */
.pstage{overflow:auto;align-items:safe center;padding:12px 16px}
.slide{max-height:none;overflow:visible}
.sl-lesson,.sl-body{overflow:visible}
@media (max-width:720px){.slide{aspect-ratio:auto;min-height:0}.slide:has(.sl-title){min-height:70vh}.sl-lesson{margin:0}.sl-body{margin:0}.slide:has(.ov){background:#fff}}
.slide:has(.sl-lesson){aspect-ratio:auto}
.sl-lesson{margin:0;min-height:min(540px,calc(100vh - 150px))}
@media (max-width:720px){.ls-split.case{grid-template-columns:minmax(0,1fr)}.ls-split.case .ls-pic{order:2}.sl-lesson{min-height:0}}