/* Figtree, the Climbpath logo's font (SIL Open Font License, /shared/fonts/Figtree-OFL.txt), served from the site */
@font-face{font-family:Figtree;font-style:normal;font-weight:300 900;font-display:swap;src:url(/shared/fonts/figtree-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Figtree;font-style:normal;font-weight:300 900;font-display:swap;src:url(/shared/fonts/figtree-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
/* Climbpath — "Flight deck" theme shared with the Multi-Engine and Single-Engine trainers:
   matte black panel, ivory type, square corners. Colour only where it means something:
   green = right / normal, amber = caution / hook, red = wrong / warning, blue = links and the instruments. */
:root,:root:not([data-theme=dark]){--bg:#0f1012;--card:#17181b;--card2:#1c1d21;--ink:#eceae3;--mute:#98968d;--line:#2d2e33;--blue:#4c8dff;--red:#e5484d;--grn:#46a758;--yel:#e2a336;--tint:rgba(255,255,255,.035);--hov:rgba(255,255,255,.05);--track:#34363c;--on:#111;--mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;--sky:#18324f;--gnd:#3d2f22;color-scheme:dark}
:root[data-theme=light]{--bg:#efede6;--card:#faf8f3;--card2:#f3f1ea;--ink:#17181b;--mute:#66645d;--line:#d2cfc5;--blue:#2463d9;--red:#c4302b;--grn:#2c7d3f;--yel:#a8700a;--tint:rgba(0,0,0,.04);--hov:rgba(0,0,0,.05);--track:#cfccc2;--on:#f6f4ee;--sky:#cfe0f3;--gnd:#d9c7ad;color-scheme:light}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 Figtree,"Avenir Next",Avenir,"Helvetica Neue",Helvetica,Arial,sans-serif}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
::selection{background:rgba(127,127,127,.35)}
a{color:var(--blue)}
.ic{width:1.15em;height:1.15em;vertical-align:-.22em;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;display:inline-block;flex-shrink:0}

/* ---------- layout ---------- */
.wrap{min-height:100vh}
.side{position:sticky;top:0;z-index:20;background:var(--bg);padding:max(10px,env(safe-area-inset-top)) 14px 10px;border-bottom:1px solid var(--line);display:flex;gap:8px;align-items:center}
.main{padding:14px 14px 70px;max-width:1680px;width:100%;margin:0 auto;min-width:0}
.brand{display:none}
.mnav{display:flex;align-items:center;gap:8px;flex:1;min-height:50px;background:var(--card);border:1px solid var(--line);border-radius:4px;padding:0 14px;font-size:16px;font-weight:600;cursor:pointer;text-align:left}
.mnav::after{content:'';width:8px;height:8px;border-right:2px solid var(--mute);border-bottom:2px solid var(--mute);transform:rotate(45deg);margin:-4px 2px 0 auto;transition:transform .15s}
.mnav[aria-expanded=true]::after{transform:rotate(225deg);margin-top:4px}
.tabs{display:none;position:absolute;left:14px;right:14px;top:100%;margin-top:-4px;flex-direction:column;gap:1px;padding:6px;background:var(--card);border:1px solid var(--line);border-radius:4px;box-shadow:0 14px 34px rgba(0,0,0,.35);max-height:calc(100vh - 90px);overflow:auto}
.tabs.open{display:flex}
.tab{position:relative;display:flex;align-items:center;gap:10px;width:100%;border:0;background:none;padding:9px 10px;font-size:16px;font-weight:600;border-radius:4px;cursor:pointer;color:var(--ink);text-align:left}
.tab .ti,.mnav .ti{width:30px;height:30px;display:grid;place-items:center;flex-shrink:0}
.tab .ti .ic,.mnav .ti .ic{width:17px;height:17px;color:var(--mute)}
.tab.on{background:var(--hov)}
.tab.on .ti .ic{color:var(--ink)}
.tab .cnt{margin-left:auto;font:600 11px var(--mono);color:var(--mute)}
.navg{font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);opacity:.8;margin:12px 10px 3px}
.sidetools{display:contents}
.toolbtn{width:46px;height:50px;flex-shrink:0;display:grid;place-items:center;border:1px solid var(--line);border-radius:4px;background:var(--card);cursor:pointer;color:var(--ink)}
.toolbtn .ic{width:19px;height:19px}
.toolbtn.wide{display:none}
/* the section name may wrap to two lines rather than push the tool buttons off a phone screen */
.mnav{min-width:0}
#mnavl{min-width:0;line-height:1.15;overflow-wrap:break-word}
@media (max-width:480px){
 .side{gap:6px;padding-left:10px;padding-right:10px}
 .toolbtn{width:42px}
 .mnav{padding:0 10px;gap:6px;font-size:15px}
 .mnav .ti{display:none}
 .tabs{left:10px;right:10px}
}
@media (min-width:960px){
 .wrap{display:grid;grid-template-columns:264px 1fr}
 .side{height:100vh;overflow:auto;flex-direction:column;align-items:stretch;gap:0;padding:18px 14px 14px;border-bottom:0;border-right:1px solid var(--line)}
 .mnav{display:none}
 .tabs{display:flex;position:static;padding:0;border:0;box-shadow:none;background:none;max-height:none;overflow:visible;gap:1px}
 .tab{font-size:14.5px;color:var(--mute);padding:6px 10px}
 .tab:hover{color:var(--ink);background:var(--tint)}
 .tab.on{color:var(--ink);background:var(--hov)}
 .tab.on::before{content:'';position:absolute;left:-14px;top:7px;bottom:7px;width:3px;background:var(--ink)}
 .sidetools{display:flex;gap:8px;margin-top:auto;padding-top:12px;border-top:1px solid var(--line)}
 .toolbtn{flex:1;width:auto;height:42px;background:transparent}
 .toolbtn:hover{background:var(--hov)}
 .main{padding:30px 40px 60px}
 .sidenote{display:block}
 .toolbtn.wide{display:grid}
}
/* big screens: more room around the page and slightly larger lesson text */
@media (min-width:1400px){.main{padding:34px clamp(40px,3vw,64px) 64px}.lbody{font-size:17px}}
.sidenote{display:none;color:var(--mute);font-size:12px;line-height:1.45;margin:12px 4px 0}

/* ---------- building blocks ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:4px;padding:20px;margin-bottom:14px}
@media (max-width:640px){.card{padding:16px}}
.q{font-size:19px;font-weight:600;margin:0 0 14px;line-height:1.35}
h2.ttl{font-size:24px;font-weight:600;margin:0 0 4px;line-height:1.25}
.tag{color:var(--mute);font-size:14px;margin-top:6px}
.sech{font-size:11px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--mute);border-bottom:1px solid var(--line);padding-bottom:7px;margin:22px 2px 10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:var(--on);border:1px solid var(--ink);border-radius:4px;padding:12px 20px;font-weight:700;font-size:15px;letter-spacing:.06em;text-transform:uppercase;cursor:pointer;margin-top:14px}
.btn:hover{filter:brightness(.92)}
.btn.sec,.btn.wsec{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.sec:hover{background:var(--hov);filter:none}
.btn[disabled]{opacity:.45;cursor:default}
.btns{display:flex;gap:8px;flex-wrap:wrap}
.btns .btn{margin-top:10px}
@media (max-width:640px){.btn{width:100%}.btns .btn{flex:1 1 100%}}
.chip{display:inline-flex;align-items:center;gap:6px;background:transparent;border:1px solid var(--line);color:var(--ink);border-radius:4px;padding:8px 12px;cursor:pointer;font-size:14px;font-weight:600}
.chip:hover{border-color:var(--ink)}
.chip.on{background:var(--ink);color:var(--on);border-color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.opt{display:block;width:100%;text-align:left;background:transparent;border:1px solid var(--line);border-radius:4px;padding:12px 14px;margin:0;font-size:16px;cursor:pointer;line-height:1.4;min-height:48px}
.opt:hover{border-color:var(--ink);background:var(--hov)}
.opt.ok{border-color:var(--grn);background:rgba(70,167,88,.14)}
.opt.no{border-color:var(--red);background:rgba(229,72,77,.14)}
.opt.pick{border-color:var(--blue);background:rgba(76,141,255,.12)}
.opt[disabled]{cursor:default}
.opts{display:grid;grid-template-columns:1fr;gap:8px}
@media (min-width:900px){.opts{grid-template-columns:1fr 1fr}}
.why{margin-top:14px;padding:12px 14px;border-radius:4px;background:var(--tint);border-left:3px solid var(--grn);font-size:15px}
.why.wrong{border-left-color:var(--red)}
.plain{margin-top:8px;padding:8px 10px;border-left:3px solid var(--mute);background:var(--tint);border-radius:0 4px 4px 0;font-size:14px;color:var(--mute)}
.plain b{display:block;font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);margin-bottom:2px}
.src{margin-top:8px;padding:9px 12px;border:1px solid var(--line);border-radius:4px;font-size:13.5px;color:var(--mute);background:var(--tint);display:flex;gap:8px;align-items:flex-start}
.src .ic{margin-top:2px}
.hook{margin:12px 0;padding:10px 12px;border-left:3px solid var(--yel);background:var(--tint);border-radius:0 4px 4px 0}
p.tag{font-size:13px;border-left:2px solid var(--line);padding-left:8px}
.mono{font-family:var(--mono);font-size:14px;background:var(--tint);padding:8px 10px;border-radius:4px;overflow-x:auto}
table.t{border-collapse:collapse;width:100%;font-size:14.5px;margin:10px 0;display:block;overflow-x:auto}
table.t th{text-align:left;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);font-weight:700;border-bottom:1px solid var(--line);padding:7px 8px}
table.t td{border-bottom:1px solid var(--line);padding:7px 8px;vertical-align:top}
table.t.stack,table.t.stack tbody,table.t.stack tr,table.t.stack td,table.t.stack th{display:block;width:auto}
table.t.stack{border-top:1px solid var(--line)}
table.t.stack tr:first-child{display:none}
table.t.stack tr{border-bottom:1px solid var(--line);padding:8px 0}
table.t.stack td,table.t.stack th{border:0;padding:3px 0}
table.t.stack td:first-child:not([data-l]){font-weight:600}
table.t.stack [data-l]::before{content:attr(data-l);display:block;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);font-weight:700;margin-bottom:1px}
.les ul,.les ol{padding-left:22px}.les li{margin:4px 0}
.prog{height:4px;background:var(--track);border-radius:2px;overflow:hidden}
.prog i{display:block;height:100%;background:var(--grn)}
.bad{color:var(--red)}.good{color:var(--grn)}
.big{font:700 52px/1 var(--mono)}
.qbar{display:flex;gap:8px;align-items:center}
.qbar .right{margin-left:auto}
.iconbtn{width:40px;height:40px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:4px;background:transparent;cursor:pointer}
.iconbtn:hover{border-color:var(--ink)}
.hidden{display:none!important}

/* rows (home, lists) */
.rows{display:grid;gap:8px;grid-template-columns:minmax(0,1fr)}
.trow{display:flex;align-items:center;gap:14px;width:100%;text-align:left;cursor:pointer;padding:12px 14px;border:1px solid var(--line);border-radius:4px;background:var(--card)}
.trow:hover{border-color:var(--ink)}
.lci{width:44px;height:44px;border:1px solid var(--line);border-radius:4px;display:grid;place-items:center;flex-shrink:0}
.lci .ic{width:22px;height:22px}
.trt{flex:1;min-width:0}
.trt b{display:block;font-size:16px;font-weight:600}
.trt>span{display:block;font-size:13px;color:var(--mute)}
.trt .prog{margin-top:8px}
.trp{font:13px var(--mono);color:var(--mute);white-space:nowrap}
.lcgo{width:32px;height:32px;border:1px solid var(--line);border-radius:4px;display:grid;place-items:center;flex-shrink:0}
.lcgo .ic{width:14px;height:14px}
.grid2{display:grid;gap:8px;grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* home */
.hero{display:flex;align-items:center;gap:16px;border-top:3px solid var(--ink)}
.hero h2{margin:0;font-size:24px;font-weight:600}
.hero .sub{color:var(--mute);font-size:14px;margin-top:2px}
.hero svg.mark{margin-left:auto;width:120px;height:72px;flex-shrink:0}
@media (max-width:640px){.hero svg.mark{width:84px;height:52px}.hero h2{font-size:20px}}
.hfact{border:1px solid var(--line);border-left:3px solid var(--yel);border-radius:4px;padding:10px 12px;margin:0 0 14px;background:var(--card);font-size:14.5px}
.hfact .hd{display:flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);font-weight:700;margin-bottom:4px}
.hfact .hd .chip{margin-left:auto;letter-spacing:0;text-transform:none;padding:5px 10px;font-size:13px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.stats div{border:1px solid var(--line);border-radius:4px;padding:10px 12px}
.stats b{display:block;font:600 20px var(--mono)}
.stats span{font-size:12px;color:var(--mute)}
@media (max-width:640px){.stats{grid-template-columns:repeat(2,1fr)}}

/* unit / lesson */
.crumbs{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.les h3{font-size:20px;font-weight:600;margin:4px 0 10px}
.les p{margin:8px 0}
.lesnav{display:flex;gap:8px;justify-content:space-between;margin-top:18px;flex-wrap:wrap}
.lesnav .btn{margin:0}
.toc{display:grid;gap:4px;margin:10px 0 0;padding:0;list-style:none;counter-reset:l}
.toc button{display:flex;gap:10px;align-items:center;width:100%;text-align:left;background:none;border:1px solid transparent;border-radius:4px;padding:8px 10px;cursor:pointer}
.toc button:hover{border-color:var(--line);background:var(--hov)}
.toc .n{font:600 12px var(--mono);color:var(--mute);width:22px}
.toc .done{margin-left:auto;color:var(--grn)}
.tcl{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.tcl span{font-size:12px;border:1px solid var(--line);border-radius:3px;padding:3px 7px;color:var(--mute)}
.fig{margin:14px 0;border:1px solid var(--line);border-radius:4px;background:var(--card2);padding:10px;overflow:hidden}
.fig>svg{display:block;width:100%;height:auto;max-height:520px}
.fig figcaption{font-size:12.5px;color:var(--mute);margin-top:6px;display:flex;gap:8px;align-items:center}
.fig figcaption .chip{margin-left:auto;padding:4px 8px;font-size:12px}
.labcta{display:flex;align-items:center;gap:12px;width:100%;text-align:left;border:1px solid var(--line);border-left:3px solid var(--grn);border-radius:4px;background:var(--card);padding:10px 12px;cursor:pointer;margin:10px 0}
.labcta:hover{border-color:var(--ink);border-left-color:var(--grn)}
.labcta.m3d{border-left-color:var(--blue)}
.labcta b{display:block;font-weight:600}
.labcta span.d{font-size:13px;color:var(--mute)}
.keys{margin:0;padding-left:20px}.keys li{margin:6px 0}
.tabsrow{display:flex;gap:6px;flex-wrap:wrap;margin:14px 0 4px}

/* figures: SVG text and strokes follow the theme */
svg text{fill:var(--ink);font-family:Figtree,"Avenir Next",Avenir,Helvetica,Arial,sans-serif}
svg .mu{fill:var(--mute)}
svg .sm{font-size:11px}
.zoomfig{position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.88);display:grid;place-items:center;padding:12px;cursor:zoom-out}
.zoomfig .fig{max-width:1600px;width:100%;background:var(--card2)}
.zoomfig .fig>svg{max-height:88vh}
.zoomfig.turned{display:block}
.zoomfig.turned .fig{position:absolute;left:50%;top:50%;max-width:none;margin:0;transform:translate(-50%,-50%) rotate(90deg)}
.zoomfig.turned .fig>svg{max-height:none;width:100%;height:auto}
.fig[data-fig]>svg{cursor:zoom-in}
.labzoom{display:none;margin:-4px 0 10px}
@media (max-width:700px){.labzoom:not([hidden]){display:inline-flex}}

/* 3D */
.v3d{position:relative;border:1px solid var(--line);border-radius:4px;background:#0c0d0f;overflow:hidden;margin:10px 0;touch-action:none}
.v3d canvas{display:block;width:100%;height:100%}
.v3d .hud{position:absolute;left:10px;top:8px;right:10px;display:flex;gap:6px;flex-wrap:wrap;pointer-events:none;color:#eceae3;font-size:12.5px}
.v3d .hud b{font-weight:600}
.v3dbar{margin:-4px 0 12px;display:grid;gap:8px}
.v3dbar .ctl{display:flex;gap:6px;flex-wrap:wrap}
.v3dbar .ctl:empty{display:none}
.v3dbar .ctl button{background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:4px;padding:7px 11px;font-size:13px;font-weight:600;cursor:pointer}
.v3dbar .ctl button.on{border-color:var(--ink);background:var(--hov)}
.v3dbar .note3d{font-size:13px;color:var(--mute);line-height:1.45}
.v3d .lbl{position:absolute;pointer-events:none;font-size:12px;line-height:1.25;font-weight:600;color:#eceae3;background:rgba(15,16,18,.78);border:1px solid #2d2e33;padding:2px 6px;border-radius:3px;max-width:min(240px,46%);width:max-content;text-align:center}
.v3d .note3d{position:absolute;left:10px;right:10px;bottom:8px;font-size:12px;color:#c9c7bf;pointer-events:none;text-shadow:0 1px 2px #000}

/* labs: always on a dark instrument panel */
.labview,.darkpanel{--bg:#0c0d0f;--card:#17181b;--card2:#1c1d21;--ink:#eceae3;--mute:#98968d;--line:#2d2e33;--tint:rgba(255,255,255,.035);--on:#111;--track:#34363c;color:var(--ink)}
.labview{background:#0c0d0f;border:1px solid var(--line);border-radius:4px;padding:14px;margin:10px 0}
.labview svg{display:block;width:100%;height:auto;max-height:440px}
/* lab labels move with the sliders, so lines may pass behind them: a thin outline in the panel colour keeps them readable */
.labview svg text{paint-order:stroke;stroke:#0c0d0f;stroke-width:3px;stroke-linejoin:round}
.lrow{display:grid;grid-template-columns:150px 1fr 70px;gap:10px;align-items:center;margin:8px 0;font-size:14px}
.lrow output{font:600 14px var(--mono);text-align:right}
@media (max-width:640px){.lrow{grid-template-columns:1fr 64px}.lrow label{grid-column:1/-1;margin-bottom:-6px}}
.lout{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px;margin-top:10px}
.lout div{border:1px solid var(--line);border-radius:4px;padding:8px 10px;background:var(--tint)}
.lout b{display:block;font:600 18px var(--mono)}
.lout span{font-size:12px;color:var(--mute)}
.linp{background:var(--card);border:1px solid var(--line);border-radius:4px;padding:9px 10px;width:100%;font:15px var(--mono)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:30px;background:transparent;accent-color:var(--ink)}
input[type=range]::-webkit-slider-runnable-track{height:6px;border-radius:2px;background:linear-gradient(90deg,var(--ink) var(--p,50%),var(--track) var(--p,50%))}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:26px;border-radius:2px;background:var(--ink);margin-top:-10px;box-shadow:0 0 0 3px var(--card)}
input[type=range]::-moz-range-track{height:6px;background:var(--track);border-radius:2px}
input[type=range]::-moz-range-progress{height:6px;background:var(--ink);border-radius:2px}
input[type=range]::-moz-range-thumb{width:14px;height:26px;border-radius:2px;background:var(--ink);border:0}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:4px;overflow:hidden}
.seg button{border:0;background:transparent;padding:8px 12px;cursor:pointer;font-weight:600;font-size:14px}
.seg button+button{border-left:1px solid var(--line)}
.seg button.on{background:var(--ink);color:var(--on)}

/* quiz map */
.qmap{margin-top:16px;border:1px solid var(--line);border-radius:4px;padding:0 10px}
.qmap summary{display:flex;align-items:baseline;gap:10px;padding:12px 0;cursor:pointer;list-style:none}
.qmap summary::-webkit-details-marker{display:none}
.qmap summary b{font-weight:600}
.qmap summary span{color:var(--mute);font-size:13px}
.qmap summary::after{content:"+";margin-left:auto;font-family:var(--mono);color:var(--mute)}
.qmap[open] summary::after{content:"\2013"}
.qgrid{display:flex;flex-wrap:wrap;gap:3px;padding-bottom:10px}
.qd{width:28px;height:24px;border:1px solid var(--line);background:transparent;color:var(--mute);font:600 10px/1 var(--mono);border-radius:3px;cursor:pointer;padding:0}
.qd:hover{border-color:var(--ink);color:var(--ink)}
.qd.ok{border-color:var(--grn);color:var(--grn)}
.qd.no{border-color:var(--red);color:var(--red)}
.qd.sk{border-color:var(--yel);color:var(--yel);border-style:dashed}
.qd.an{border-color:var(--blue);color:var(--blue)}
.qd.cur{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.qleg{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;font-size:12.5px;color:var(--mute);padding:0 0 12px}
.qleg span{display:inline-flex;align-items:center;gap:6px}
.qleg i.qd{display:inline-block;width:12px;height:12px;cursor:default}
.qleg .chip{margin-left:auto}
.timer{font:600 15px var(--mono);border:1px solid var(--line);border-radius:4px;padding:6px 10px}
.timer.low{color:var(--red);border-color:var(--red)}
.res{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin:12px 0}
.res div{border:1px solid var(--line);border-radius:4px;padding:10px 12px;border-top:3px solid var(--line)}
.res div.p{border-top-color:var(--grn)}.res div.f{border-top-color:var(--red)}
.res b{display:block;font:600 22px var(--mono)}
.res span{font-size:12.5px;color:var(--mute)}
.miss{margin-top:8px;padding:10px 12px;border:1px solid var(--line);border-radius:4px;background:var(--tint);font-size:14.5px}

/* memory cards */
.memtop{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.memtoday{flex:1;min-width:200px}
.memtoday b{font-size:20px;display:block;font-weight:600}
.memtoday span{color:var(--mute);font-size:13.5px}
.flip{perspective:1400px;margin:16px 0;cursor:pointer}
.flipin{display:grid;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.flip.on .flipin{transform:rotateY(180deg)}
.face{grid-area:1/1;position:relative;min-height:230px;-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:4px;padding:44px 22px 24px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:12px;border:1px solid var(--line);background:var(--card2)}
.face.back{transform:rotateY(180deg);border-color:var(--grn)}
/* the face turned away is also hidden outright (switching halfway through the flip), so a browser that draws the
   card flat never shows the answer mirrored on top of the question */
.face{transition:visibility 0s .25s}
.face.back,.flip.on .face.front{visibility:hidden}
.flip.on .face.back{visibility:visible}
.mcat{position:absolute;top:14px;left:16px;font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--mute)}
.mfront{font-size:22px;font-weight:600;line-height:1.3}
.mback{font-size:21px;font-weight:600;line-height:1.35}
.mbtns{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mbtns .btn{margin:0;padding:13px 4px;width:auto}
.mbtns .again{background:var(--red);border-color:var(--red);color:#fff}
.mbtns .easy{background:var(--grn);border-color:var(--grn);color:#fff}
.ring text{font:700 18px var(--mono)}

/* glossary */
.gl{border-bottom:1px dotted var(--mute);cursor:help}
.glpop{position:fixed;z-index:90;max-width:320px;background:var(--card);border:1px solid var(--line);border-radius:4px;padding:10px 12px;font-size:14px;box-shadow:0 12px 30px rgba(0,0,0,.4)}
.glpop b{display:block;margin-bottom:2px}
.gloss dt{font-weight:600;margin-top:12px}
.gloss dd{margin:2px 0 0;color:var(--mute)}
.search{width:100%;background:var(--card);border:1px solid var(--line);border-radius:4px;padding:12px 14px;font-size:16px}
.hit{padding:10px 0;border-bottom:1px solid var(--line);cursor:pointer}
.hit:hover b{text-decoration:underline}
.hit span{display:block;font-size:13.5px;color:var(--mute)}
mark{background:rgba(226,163,54,.35);color:inherit}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--grn);color:#fff;padding:10px 16px;border-radius:4px;font-weight:600;z-index:95;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.spin{display:inline-block;width:14px;height:14px;border:2px solid var(--mute);border-top-color:transparent;border-radius:50%;animation:sp 1s linear infinite;vertical-align:-2px}
@keyframes sp{to{transform:rotate(360deg)}}
@media (hover:none){.chip:not(.on):hover,.opt:not(.ok):not(.no):not(.pick):hover,.trow:hover,.labcta:hover{border-color:var(--line);background:transparent}.trow:hover{background:var(--card)}}
@media print{.side,.noprint,.btn,.chip{display:none!important}.wrap{display:block}body{background:#fff;color:#000}.card{border:0;padding:0}.main{padding:0}}

/* accounts */
.toolbtn.in .ic{color:var(--grn)}
.welcome{position:fixed;inset:0;z-index:200;background:var(--bg);display:grid;place-items:center;padding:20px 16px;overflow:auto}
.wcard{width:100%;max-width:420px;padding:24px 22px;text-align:center}.wcard .btn{width:100%;margin-top:8px}.wcard .accf,.wcard .chip{text-align:left}.wlogo{width:120px;height:72px;margin:0 auto 6px;display:block}
.accf{display:grid;gap:12px;margin:4px 0 14px;text-align:left}.accf label{display:grid;gap:5px;font-size:13px;font-weight:600;color:var(--mute)}.accf .btn{width:100%;margin:0}
.accerr{color:var(--red);font-size:14px}.accerr.good{color:var(--grn)}.accerr:empty{display:none}
.accpg .btns .btn{flex:1}.accd{border-top:1px solid var(--line);margin-top:16px;padding-top:12px}.accd summary{cursor:pointer;font-weight:600}.accd .accf{margin-top:12px}
.pkrow{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:4px;padding:8px 10px;margin:0 0 6px}.pkn{display:grid;flex:1;min-width:0;font-size:14.5px}.pkn span{color:var(--mute);font-size:12.5px}
.wsub{color:var(--mute);font-size:14px;line-height:1.5;margin:6px 0 14px}

/* pull to refresh */
#ptr{position:fixed;left:50%;top:0;z-index:70;width:40px;height:40px;margin-top:max(8px,env(safe-area-inset-top));border-radius:50%;background:var(--card);border:1px solid var(--line);box-shadow:0 4px 14px rgba(0,0,0,.25);display:grid;place-items:center;color:var(--mute);opacity:0;transform:translate(-50%,-50px);pointer-events:none;transition:opacity .15s}
#ptr .ic{width:20px;height:20px}#ptr.go{color:var(--blue)}#ptr.spin .ic{animation:ptrs .7s linear infinite}@keyframes ptrs{to{transform:rotate(360deg)}}

/* language */
.toolbtn.lgb{font:700 13px/1 var(--mono,ui-monospace,Menlo,monospace);letter-spacing:.06em}
.wlang{justify-content:center;margin:-6px 0 14px}.wlang .chip{padding:5px 12px;font-size:13px}

/* demo: locked units, labs and pages (the full course opens when the admin grants access) */
.trow.lockd{background:transparent;border-style:dashed}
.trow.lockd .lci .ic,.trow.lockd .trp{color:var(--mute)}
.trow.lockd .trt b{color:var(--mute)}
.lockc{display:flex;gap:16px;align-items:flex-start;border-left:3px solid var(--blue)}
.lockc .lci .ic{color:var(--blue)}
.lockc .btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.toc.lockd .tocl{display:flex;align-items:center;gap:12px;padding:10px 12px;color:var(--mute)}
.toc.lockd .tocl .ic{width:15px;height:15px;margin-left:auto;flex-shrink:0}
@media (max-width:640px){.lockc{flex-direction:column;gap:10px}}

/* Lessons read like slides in a class: bigger type, air between the ideas, and colour on what matters —
   key words in a light instrument blue, worked examples in green, notes and cautions in amber. */
:root,:root:not([data-theme=dark]){--hi:#a9c8ff;--exb:rgba(70,167,88,.09);--ntb:rgba(226,163,54,.08)}
:root[data-theme=light]{--hi:#1d4fb8;--exb:rgba(44,125,63,.07);--ntb:rgba(168,112,10,.08)}
.les h3{font-size:22px;line-height:1.3;margin:6px 0 12px}
.sprog{display:flex;align-items:center;gap:10px;margin:14px 0 2px}
.sprog i{display:flex;gap:5px;flex:1;max-width:240px}
.sprog b{flex:1;height:4px;border-radius:2px;background:var(--line)}
.sprog b.on{background:var(--blue)}
.sprog span{font-size:12.5px;color:var(--mute);white-space:nowrap}
:is(.les,.cpass) .lbody{font-size:17px;line-height:1.7;margin-top:18px}
:is(.les,.cpass) .lbody>*{margin:0 0 20px}
:is(.les,.cpass) .lbody>*:last-child{margin-bottom:8px}
:is(.les,.cpass) .lbody ul,:is(.les,.cpass) .lbody ol{padding-left:24px}
:is(.les,.cpass) .lbody li{margin:0 0 12px;padding-left:4px}
:is(.les,.cpass) .lbody li:last-child{margin-bottom:0}
:is(.les,.cpass) .lbody li::marker{color:var(--blue)}
:is(.les,.cpass) .lbody b{color:var(--hi);font-weight:600}
:is(.les,.cpass) .lbody .plain{padding:14px 16px;border-left:3px solid var(--grn);background:var(--exb);color:var(--ink);font-size:16.5px;line-height:1.65;border-radius:0 6px 6px 0}
:is(.les,.cpass) .lbody .plain>b:first-child{color:var(--grn);font-size:11.5px;margin-bottom:6px}
:is(.les,.cpass) .lbody .plain b:not(:first-child){color:var(--ink)}
:is(.les,.cpass) .lbody .plain .f{display:block;margin-top:4px;font-size:18px}
:is(.les,.cpass) .lbody p.tag{font-size:15px;line-height:1.6;color:var(--ink);border-left:3px solid var(--yel);background:var(--ntb);padding:10px 14px;border-radius:0 6px 6px 0}
:is(.les,.cpass) .lbody table.t{font-size:15px}
:is(.les,.cpass) .lbody table.t th{color:var(--blue)}
:is(.les,.cpass) .lbody table.t td{padding:9px 8px}
table.t.num th,table.t.num td{text-align:center;padding:6px 3px;font-variant-numeric:tabular-nums;white-space:nowrap;letter-spacing:0}
table.t.num th:first-child,table.t.num td:first-child{text-align:left;padding-left:2px}
:is(.les,.cpass) .lbody table.t.num td{padding:7px 3px}
.lesnav{margin-top:22px}
.sl-f{animation:slf .26s ease-out}.sl-b{animation:slb .26s ease-out}
@keyframes slf{from{opacity:0;transform:translateX(16px)}}@keyframes slb{from{opacity:0;transform:translateX(-16px)}}
@media (prefers-reduced-motion:reduce){.sl-f,.sl-b{animation:none}}
.keys li{margin:10px 0;line-height:1.6}

/* labs: what the lab is for, and a worked example to try */
.labwhy{border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:4px;padding:11px 13px;margin:10px 0 8px;font-size:15px;line-height:1.55;background:var(--tint)}
.labwhy span{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--mute);font-weight:700;margin-bottom:4px}
.howto{margin:8px 0 12px;border:1px solid var(--line);border-left:3px solid var(--grn);border-radius:4px;background:var(--exb);padding:2px 13px}
.howto summary{cursor:pointer;font-weight:600;padding:10px 0;color:var(--grn)}
.howto p{margin:0 0 8px;font-size:15px;line-height:1.55}
.howto ol{margin:0 0 10px;padding-left:22px;font-size:15px;line-height:1.55}
.howto li{margin:0 0 8px}
.howto .exset{margin:2px 0 12px}
/* a table that fits fills the width (table.t is a block so a wide one can be measured and stacked) */
table.t>tbody{display:table;width:100%}

/* the correction after an answer: right or wrong, the answer and why, then the passage of the lesson that teaches it */
.corr .cv{display:flex;gap:6px;align-items:center;margin-bottom:6px}
.corr .ca{font-size:15px;margin:2px 0}.corr .ca s{color:var(--mute)}
.corr p{margin:8px 0 0;line-height:1.6}
.cpass{margin:14px 0 4px;padding:12px 14px 4px;border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:4px;background:var(--tint)}
.cph{display:flex;gap:6px;align-items:center;font-size:12.5px;color:var(--mute);margin-bottom:8px}.cph b{color:var(--ink)}
.cpass .lbody{font-size:16px}
/* a finished quiz or exam: every question, opening onto its correction */
.rvf{margin-bottom:8px}
details.rv{border:1px solid var(--line);border-radius:4px;margin:6px 0;background:var(--card)}
details.rv>summary{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;cursor:pointer;list-style:none}
details.rv>summary::-webkit-details-marker{display:none}
details.rv>summary .qd{flex:none;cursor:pointer}
.rvq{font-size:14.5px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
details.rv[open]>summary .rvq{-webkit-line-clamp:unset;color:var(--mute)}
.rvb{padding:0 12px 12px}
/* the mock exam's clock: fixed at the bottom of the screen, amber from 30 minutes left, red from 10 */
.exclock{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;align-items:center;gap:10px;background:var(--card);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom))}
.exclock>span:first-child{display:flex;gap:6px;align-items:center;font:600 16px var(--mono)}
.exclock .tag{margin:0 0 0 auto;font-size:13px}
.exclock .exl{font:500 13px Figtree,"Avenir Next",Avenir,"Helvetica Neue",Helvetica,Arial,sans-serif;color:var(--mute)}
.exclock i{position:absolute;left:0;right:0;top:0;height:3px;background:var(--line)}.exclock i b{display:block;height:100%;background:var(--blue)}
.exclock.warn>span:first-child{color:var(--yel)}.exclock.warn i b{background:var(--yel)}
.exclock.low>span:first-child{color:var(--red)}.exclock.low i b{background:var(--red)}
body.exam-on{padding-bottom:64px}
.exnote{margin:10px 0 0;padding:10px 12px;border-left:3px solid var(--yel);background:var(--ntb);border-radius:0 4px 4px 0;font-weight:600}
.exnote[hidden]{display:none}

/* On a wide screen the sidebar folds away: a round button on its edge, and the choice is kept (cp-side, shared by
   every Climbpath app on this device) */
.sidetog{display:none}
@media (min-width:960px){
 .sidetog{display:grid;place-items:center;position:fixed;z-index:35;top:22px;left:calc(264px - 18px);width:36px;height:36px;padding:0;border-radius:4px;border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer;box-shadow:0 1px 4px rgba(0,0,0,.18);transition:left .28s ease,border-color .15s}
 .sidetog:hover{border-color:var(--ink)}
 .sidetog svg{transition:transform .28s ease}
 .sidecol .sidetog{left:14px}
 .sidecol .sidetog svg{transform:rotate(180deg)}
 .wrap{transition:grid-template-columns .28s ease}
 .sidecol .wrap{grid-template-columns:0 1fr}
 .side{transition:padding .28s ease,visibility 0s}
 .sidecol .side{padding-left:0;padding-right:0;border-right-color:transparent;overflow:hidden;visibility:hidden;transition:padding .28s ease,visibility 0s .28s}
 /* while it slides, the sidebar's contents keep their width: the panel is cut away, its text never re-wraps */
 .side>*{min-width:236px}
 html.sidecol .main{padding-left:72px}
}
@media (prefers-reduced-motion:reduce){.sidetog,.sidetog svg,.wrap,.side{transition:none!important}}
/* a weather report or forecast quoted in a question: set apart in monospace, like a real briefing */
.q .mono{display:block;margin:8px 0 4px;font-weight:400;font-size:14.5px;line-height:1.45;white-space:normal;overflow-wrap:anywhere}