/* Course player — brand-neutral. The palette is the TechFoundations-era one (cream, ink, gold);
   swap the tokens below to rebrand. Nothing else in this file names a colour. */
:root{
  --bg:#faf8f4; --ink:#1c1b18; --mut:#6b675f; --line:#e7e2d8; --card:#fff;
  --accent:#b8893b; --accent-hi:#e8c98a; --accent-soft:#faf6ee; --accent-ring:rgba(184,137,59,.2);
  --rail-a:#f7f3ea; --rail-b:#efe7d9; --rail-line:#e6dcc8; --node:#ddd2bc; --off:#ccc8be;
  --ok:#1f7a4d; --ok-bg:#eef7f0; --ok-line:#bfe0cd;
  --no:#a8342b; --no-bg:#fbeeec; --no-line:#f0c9c6;
  --shadow:0 6px 20px rgba(80,60,20,.1);
  --radius:12px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
button{font:inherit;color:inherit}
a{color:var(--ink)}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:99;font-weight:700}
.skip:focus{left:0}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.content:focus{outline:none}

.app{display:flex;height:100dvh;overflow:hidden}

/* ---- rail ---- */
.rail{width:300px;flex:0 0 300px;display:flex;flex-direction:column;overflow-y:auto;
  background:linear-gradient(180deg,var(--rail-a),var(--rail-b));border-right:1px solid var(--rail-line);transition:transform .22s}
.railhead{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:18px 16px 14px;background:var(--rail-a);border-bottom:1px solid var(--rail-line)}
.wm{font-weight:800;font-size:16px;line-height:1.15}
.wm small{display:block;font-weight:600;color:var(--mut);font-size:12px;margin-top:2px}
.ring{position:relative;width:46px;height:46px;flex:0 0 46px}
.ring svg{transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:4}
.ring .track{stroke:var(--node)}
.ring .fill{stroke:var(--accent);stroke-linecap:round;transition:stroke-dashoffset .4s}
.ring span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800}
.railbody{padding:10px 12px}
.welc{display:flex;gap:10px;align-items:center;width:100%;padding:11px 12px;border:0;border-radius:var(--radius);cursor:pointer;
  font-size:14px;font-weight:600;background:var(--card);text-align:left;box-shadow:0 2px 8px rgba(80,60,20,.05)}
.welc.on{outline:1.5px solid var(--accent)}
.welc .pl{width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:10px}
.mv{margin-top:18px}
.mvh{display:flex;align-items:center;gap:12px;padding:4px 10px 10px}
.mvh .ic{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--accent-hi),var(--accent));display:flex;align-items:center;justify-content:center}
.mvh .ic.off{background:var(--off)}
.mvh .ic svg{width:20px;height:20px;fill:none;stroke:#fff;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.mvh .nm{font-size:13px;font-weight:900;letter-spacing:.08em}
.mvh .sub{font-size:11.5px;color:var(--mut)}
.step{position:relative;display:flex;gap:12px;align-items:center;width:100%;padding:8px 10px;border:0;background:none;border-radius:var(--radius);cursor:pointer;text-align:left}
.step:hover{background:rgba(255,255,255,.65)}
.step+.step::before{content:"";position:absolute;left:22px;top:-14px;width:3px;height:22px;background:var(--node);border-radius:2px}
.step.done::before,.step.on::before{background:var(--accent)}
.node{position:relative;z-index:1;width:30px;height:30px;flex:0 0 30px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:800;background:var(--card);border:2px solid var(--node);color:var(--mut)}
.step.done .node,.step.on .node{background:var(--accent);border-color:var(--accent);color:#fff}
.step.on .node{box-shadow:0 0 0 5px var(--accent-ring)}
.step.on{background:var(--card);box-shadow:var(--shadow)}
.lbl{font-size:13.5px;line-height:1.3}
.step.on .lbl{font-weight:700}
.step.done .lbl{color:var(--mut)}
.railfoot{margin-top:auto;padding:14px 16px;font-size:11px;line-height:1.6;color:var(--mut);border-top:1px solid var(--rail-line)}
.railfoot a{color:inherit}

/* ---- main ---- */
.main{flex:1;min-width:0;display:flex;flex-direction:column;height:100dvh}
.mhead,.mfoot{display:flex;align-items:center;gap:12px;padding:14px 26px;background:var(--card)}
.mhead{border-bottom:1px solid var(--line)}
.mfoot{border-top:1px solid var(--line);justify-content:space-between}
.burger{display:none;border:0;background:none;font-size:22px;cursor:pointer;line-height:1}
.ttl{font-weight:700;font-size:15px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pill{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.loc{flex:1;min-width:0;font-size:14px;color:var(--mut);text-align:center}
.mfoot button{white-space:nowrap}
.dots{display:flex;gap:5px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--line)}
.dot.on{background:var(--accent)}
.content{flex:1;min-height:0;overflow-y:auto;padding:30px max(36px,calc((100% - 760px)/2)) 48px}

button.nav{padding:10px 20px;border-radius:10px;border:0;background:var(--ink);color:#fff;font-weight:700;cursor:pointer}
button.nav:disabled{background:var(--off);cursor:not-allowed}
button.ghost{background:none;border:0;color:var(--mut);font-weight:600;cursor:pointer}
button.ghost[hidden]{display:inline-block;visibility:hidden}

/* ---- lesson content ---- */
.eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--mut);
  border-bottom:4px solid var(--accent);padding-bottom:3px;margin-bottom:12px}
h1{font-size:28px;line-height:1.2;margin:.1em 0 .4em}
h2{font-size:24px;line-height:1.25;margin:0 0 14px}
p{margin:0 0 14px}
.note{background:var(--accent-soft);border-left:4px solid var(--accent);border-radius:0 10px 10px 0;padding:11px 15px;font-size:14px;color:var(--mut);margin-bottom:18px}
.note b{color:var(--ink)}
.note ul{margin:8px 0 0 18px;padding:0}
.note li{margin:4px 0}
.tablewrap{overflow-x:auto}
table{border-collapse:collapse;margin-top:8px;font-size:12.5px;width:100%}
td{border:1px solid var(--line);padding:5px 8px;vertical-align:top}
video,.visual{display:block;width:100%;max-width:100%;height:auto;border-radius:14px;margin:6px 0 14px;box-shadow:0 8px 28px rgba(0,0,0,.12);background:#000}
.visual{background:none}
.placeholder{border:2px dashed var(--line);border-radius:var(--radius);padding:22px;background:var(--card);font-size:14px;color:var(--mut);font-style:italic}
.placeholder b{display:block;font-style:normal;font-size:12px;letter-spacing:.05em;color:var(--accent);margin-bottom:6px}

.narr{display:flex;align-items:center;gap:10px;margin:16px 0 0;padding:10px 14px;background:var(--rail-a);border-radius:10px}
.narr button{border:0;background:none;cursor:pointer;font-size:16px;width:28px}
.narr .bar{flex:1;height:4px;background:var(--line);border-radius:2px;overflow:hidden}
.narr .bar i{display:block;height:100%;width:0;background:var(--accent)}
.narr span{font-size:12px;color:var(--mut);white-space:nowrap}
.slides{margin-top:14px}
.slide{opacity:0;transform:translateY(12px);transition:opacity .5s,transform .5s;background:var(--card);border:1.5px solid var(--line);
  border-radius:14px;padding:18px 22px;font-size:15.5px;line-height:1.7;margin-bottom:11px}
.slide.on{opacity:1;transform:none}

.opt{display:block;width:100%;text-align:left;padding:13px 15px;margin:9px 0;border:1.5px solid var(--line);border-radius:var(--radius);background:var(--card);font-size:15px;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--accent)}
.opt:disabled{cursor:default}
.opt.picked{border-color:var(--ink)}
/* verdicts carry an icon and a word, never colour alone */
.verdict{padding:22px 24px;border-radius:16px;margin-top:10px;border:2px solid}
.verdict.ok{background:var(--ok-bg);border-color:var(--ok-line)}
.verdict.no{background:var(--no-bg);border-color:var(--no-line)}
.verdict .vh{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:900;margin-bottom:8px}
.verdict.ok .vh{color:var(--ok)}
.verdict.no .vh{color:var(--no)}
.verdict .vh i{font-style:normal;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px}
.verdict.ok .vh i{background:var(--ok)}
.verdict.no .vh i{background:var(--no)}
textarea,input[type=text],select{width:100%;border:1.5px solid var(--line);border-radius:var(--radius);padding:11px 12px;font:inherit;background:var(--card)}
textarea{min-height:96px;resize:vertical}
.saved{margin-top:8px;color:var(--ok);font-weight:600;font-size:14px}
.refs a{display:block;margin:5px 0;font-size:14px;min-height:24px;line-height:24px}
.scale{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}
.scale button{flex:1;min-width:36px;border:1.5px solid var(--line);background:var(--card);border-radius:8px;padding:8px 0;font-weight:700;cursor:pointer}
.scale button.sel{border-color:var(--accent);background:var(--accent-soft)}
.thanks{color:var(--ok);font-weight:700;font-size:14px}

/* ---- quiz ---- */
.q{background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:18px 20px;margin-bottom:14px}
.q.ok{border-color:var(--ok-line)}
.q.part{border-color:var(--accent-hi)}
.q.no{border-color:var(--no-line)}
.q .n{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--mut);margin-bottom:6px}
.q .stem{font-weight:600;margin-bottom:10px}
.q label.ch{display:flex;gap:10px;align-items:flex-start;padding:9px 12px;margin:6px 0;border:1px solid var(--line);border-radius:10px;cursor:pointer}
.q label.ch input{width:24px;height:24px;margin:0;flex:none;accent-color:var(--accent)}
.q .pair{display:grid;grid-template-columns:1fr 1.3fr;gap:10px;align-items:center;margin:8px 0;font-size:14.5px}
.q .fb{margin-top:10px;font-size:14px;padding:10px 12px;border-radius:10px}
.q .fb.ok{background:var(--ok-bg);color:var(--ok)}
.q .fb.no{background:var(--no-bg);color:var(--no)}
.q .model{margin-top:10px;padding:12px 14px;background:var(--accent-soft);border-radius:10px;font-size:14px}
.score{text-align:center;padding:22px;border-radius:16px;background:var(--card);border:2px solid var(--line);margin-top:6px}
.score .big{font-size:40px;font-weight:800}
.actions{display:flex;gap:12px;align-items:center;margin:18px 0}

/* ---- certificate ---- */
.cert{position:relative;overflow:hidden;background:linear-gradient(170deg,#fffef9,#fdf8ee 55%,#faf3e0);border:1px solid var(--accent-hi);
  border-radius:6px;padding:34px 32px 26px;text-align:center;font-family:Georgia,"Times New Roman",serif}
.cert::before{content:"";position:absolute;inset:8px;border:1px solid var(--accent-ring);pointer-events:none}
.cert .lab{font-family:-apple-system,sans-serif;font-size:9px;letter-spacing:.3em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.cert .name{font-size:30px;font-style:italic;display:inline-block;min-width:240px;padding-bottom:8px;border-bottom:1px solid var(--accent-hi);margin-bottom:12px;outline:none}
.cert .course{font-size:19px;font-weight:700;margin-bottom:18px}
.cert .meta{display:flex;justify-content:center;gap:34px;flex-wrap:wrap;margin-bottom:14px;font-size:13px}
.cert .meta div div:first-child{font-family:-apple-system,sans-serif;font-size:8px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:3px}
.cert .fine{font-family:-apple-system,sans-serif;font-size:9px;color:var(--mut);line-height:1.7;border-top:1px solid var(--accent-ring);padding-top:8px}
.cert .wm{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font:900 clamp(44px,10vw,84px)/1 -apple-system,sans-serif;
  color:var(--accent-ring);transform:rotate(-28deg);letter-spacing:.2em;pointer-events:none}
.card{margin-top:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.card .lab{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:800;margin-bottom:10px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:9px 18px;font-size:13px}
.btn{display:inline-block;margin-top:12px;padding:11px 18px;background:var(--ink);color:#fff;border:0;border-radius:9px;font-size:13px;font-weight:700;cursor:pointer}
.btn.accent{background:var(--accent);color:#1a1200}

.scrim{display:none;position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:5}
@media (max-width:860px){
  .rail{position:fixed;inset:0 auto 0 0;z-index:6;transform:translateX(-100%);box-shadow:0 0 40px rgba(0,0,0,.18)}
  .rail.open{transform:none}
  /* refuter 2026-11-06, measured at 375 px: the sticky .railhead is 79 px; without this 9 of 30 Shift+Tab stops sat under it (SC 2.4.11) */
  .rail{scroll-padding-top:90px}
  /* 2026-10-28 (WCAG 2.4.7, axe has no rule for it): translated off-screen, the closed drawer kept its buttons in the Tab
     order — focus vanished for 11 stops a page. Hidden when closed (out of the Tab order and the a11y tree), shown on open.
     The visibility change waits for any slide-out transition; desktop (> 860 px) is untouched. */
  .rail:not(.open){visibility:hidden;transition-property:transform,visibility;transition-delay:0s,.3s}
  .rail.open{visibility:visible}
  .scrim.open{display:block}
  .railclose{display:block;margin:10px 12px 0 auto;padding:8px 12px;font:inherit;font-size:13px;font-weight:700;background:transparent;color:inherit;border:1px solid currentColor;border-radius:8px;cursor:pointer}
  .burger{display:block}
  .dots{display:none}
  .content{padding:22px 16px 40px}
  .eyebrow{display:table}
  .mhead,.mfoot{padding:12px 16px}
  .loc{font-size:12px}
  button.nav{padding:10px 14px}
  .q .pair{grid-template-columns:1fr}
  .cert{padding:28px 16px 20px}
}
@media print{
  body *{visibility:hidden}
  .cert,.cert *{visibility:visible}
  .cert{position:fixed;inset:0;border:0}
  .cert .wm{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}