/* Quantum Sequrity Academy — local preview UI. Dark quantum-lab / technical-editorial. */
@font-face{font-family:'Syne';src:url('../fonts/Syne-Bold.woff2') format('woff2');font-weight:700;font-display:swap}
@font-face{font-family:'Syne';src:url('../fonts/Syne-ExtraBold.woff2') format('woff2');font-weight:800;font-display:swap}
@font-face{font-family:'Syne';src:url('../fonts/Syne-SemiBold.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Outfit';src:url('../fonts/Outfit-Regular.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Outfit';src:url('../fonts/Outfit-Medium.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Outfit';src:url('../fonts/Outfit-SemiBold.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'DepartureMono';src:url('../fonts/DepartureMono-Regular.woff2') format('woff2');font-weight:400;font-display:swap}

:root{
  --bg:#050506; --bg-1:#0a0a0c; --surface:#0d0d10; --surface-2:#121216;
  --line:#1b1b20; --line-2:#2a2a31; --txt:#fafafa; --txt-2:#b6b6bd; --txt-3:#76767e;
  --accent:#ff6b00; --accent-2:#ff9145; --accent-dim:rgba(255,107,0,.12); --accent-glow:rgba(255,107,0,.22);
  --good:#28c840; --good-dim:rgba(40,200,64,.12); --bad:#ff4d4d; --bad-dim:rgba(255,77,77,.12); --warn:#febc2e; --steel:#5ad1ff;
  --disp:'Syne',sans-serif; --body:'Outfit',sans-serif; --mono:'DepartureMono','SF Mono',monospace;
  --r-s:8px; --r-m:14px; --r-l:22px; --maxw:1180px; --read:70ch;
  --ease:cubic-bezier(.16,1,.3,1); --spring:cubic-bezier(.34,1.56,.64,1);
}
[data-theme="light"]{
  --bg:#f6f5f3; --bg-1:#fff; --surface:#fff; --surface-2:#f1f0ee;
  --line:#e6e4e0; --line-2:#d8d6d1; --txt:#0c0c0d; --txt-2:#4a4a50; --txt-3:#86868c;
  --accent:#ec5b00; --accent-dim:rgba(236,91,0,.1); --accent-glow:rgba(236,91,0,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--txt); font-family:var(--body); font-size:17px; line-height:1.7;
  -webkit-font-smoothing:antialiased; letter-spacing:.005em; overflow-x:hidden; min-height:100vh;
  background-image:
    radial-gradient(1100px 520px at 78% -8%, var(--accent-glow), transparent 60%),
    radial-gradient(circle at 1px 1px, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size:auto, 26px 26px; background-attachment:fixed;
}
[data-theme="light"] body{background-image:radial-gradient(1100px 520px at 78% -8%, var(--accent-glow), transparent 60%),radial-gradient(circle at 1px 1px, rgba(0,0,0,.04) 1px, transparent 1px)}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#000}

/* ---------- top bar ---------- */
.nav{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:14px;
  padding:0 clamp(18px,4vw,40px);height:58px;
  border-bottom:1px solid var(--line);
  background:color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter:blur(18px) saturate(1.15);
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease)
}
.nav.scrolled{border-bottom-color:var(--line-2);box-shadow:0 1px 0 var(--line)}

/* brand lockup */
.brand{
  display:flex;align-items:center;gap:12px;cursor:pointer;
  text-decoration:none;color:inherit;flex:none;
  outline-offset:4px;border-radius:6px
}
.brand .mark{width:28px;height:28px;flex:none}
/* orbit animation — respects reduced-motion */
@media(prefers-reduced-motion:no-preference){
  .brand:hover .orbit-h{animation:spin-h 3.2s linear infinite}
  .brand:hover .orbit-v{animation:spin-v 3.2s linear infinite}
}
@keyframes spin-h{
  0%{transform-origin:50% 50%;transform:rotateY(0deg)}
  100%{transform-origin:50% 50%;transform:rotateY(360deg)}
}
@keyframes spin-v{
  0%{transform-origin:50% 50%;transform:rotateX(0deg)}
  100%{transform-origin:50% 50%;transform:rotateX(360deg)}
}
.orbit-h,.orbit-v{transition:opacity .3s var(--ease)}
.brand:hover .orbit-h,.brand:hover .orbit-v{opacity:.85!important}
.brand-text{display:flex;flex-direction:column;gap:0;line-height:1}
.brand-inline{display:flex;align-items:center;gap:0}
.brand-wordmark{
  font-family:var(--disp);font-weight:800;font-size:1.06rem;
  letter-spacing:-.025em;color:var(--txt);line-height:1;white-space:nowrap
}
.brand-slash{display:inline-block;width:1px;height:16px;background:var(--line-2);align-self:center;margin:0 12px;flex:none}
.brand-academy{
  font-family:var(--disp);font-weight:700;font-size:1.06rem;
  letter-spacing:-.025em;color:var(--txt-3);line-height:1;white-space:nowrap
}

/* spacer */
.nav .spacer{flex:1}

/* progress indicator */
.nav .gprog{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:.68rem;color:var(--txt-3)
}
.nav .gprog .gprog-label{
  font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--txt-3);opacity:.7;display:none
}
@media(min-width:680px){.nav .gprog .gprog-label{display:inline}}
.nav .gprog #gtxt{color:var(--txt-2);white-space:nowrap}
.nav .gprog .track{
  width:80px;height:4px;background:var(--line-2);border-radius:99px;overflow:hidden;
  flex:none
}
@media(min-width:520px){.nav .gprog .track{width:120px}}
.nav .gprog .fill{
  height:100%;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  width:0;transition:width .8s var(--ease)
}

/* icon buttons */
.iconbtn{
  width:36px;height:36px;border:1px solid var(--line-2);border-radius:9px;
  background:var(--surface);color:var(--txt-2);
  cursor:pointer;display:grid;place-items:center;font-size:1rem;
  transition:.25s var(--ease);flex:none;text-decoration:none
}
.iconbtn:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-1px)}
.iconbtn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.nav-home{color:var(--txt-3)}

/* header account slot */
.nav-account{display:flex;align-items:center;gap:8px}
.nav-account .acct-signin{
  font-family:var(--disp);font-weight:700;font-size:.82rem;letter-spacing:.005em;
  background:var(--accent);color:#000;border:none;border-radius:99px;
  padding:7px 16px;cursor:pointer;white-space:nowrap;transition:.25s var(--ease);
  text-decoration:none;display:inline-flex;align-items:center
}
.nav-account .acct-signin:hover{background:var(--accent-2);transform:translateY(-1px)}
.nav-account .acct-signup{
  font-family:var(--mono);font-size:.68rem;color:var(--txt-3);
  text-decoration:none;white-space:nowrap;letter-spacing:.04em;
  border-bottom:1px dotted var(--line-2);transition:.2s
}
.nav-account .acct-signup:hover{color:var(--txt-2);border-bottom-color:var(--txt-3)}
.nav-account .acct-dashboard{
  font-family:var(--body);font-weight:500;font-size:.82rem;
  color:var(--txt-2);text-decoration:none;border:1px solid var(--line-2);
  border-radius:99px;padding:6px 14px;transition:.25s var(--ease);white-space:nowrap;
  display:inline-flex;align-items:center;gap:6px
}
.nav-account .acct-dashboard:hover{border-color:var(--accent);color:var(--accent)}
.nav-account .acct-chip{
  width:28px;height:28px;border-radius:99px;background:var(--accent-dim);
  border:1.5px solid var(--accent);display:grid;place-items:center;flex:none;
  font-family:var(--mono);font-size:.7rem;font-weight:700;color:var(--accent);
  line-height:1
}
/* acct-signin uses #000 text in both themes for WCAG AA on orange backgrounds */
@media(max-width:560px){
  .nav-account .acct-signup{display:none}
}

/* ---------- mobile / responsive hardening (prevents horizontal overflow) ---------- */
html,body{overflow-x:clip;max-width:100%}
.nav{min-width:0;flex-wrap:nowrap}
.brand{min-width:0}
.brand-text{min-width:0;overflow:hidden}
.brand-wordmark{white-space:nowrap}
/* The in-nav progress bar is non-essential on small screens (progress shows on
   course cards + the dashboard). Hide it so the bar never overflows. */
@media(max-width:700px){ .nav .gprog{display:none} }
@media(max-width:520px){
  .nav{gap:10px;padding:0 16px}
  .brand .mark{width:24px;height:24px}
  .brand-kicker{display:none}
  .brand-wordmark{font-size:1.05rem}
  .nav-account{gap:6px}
  .nav-account .acct-signin{padding:7px 13px;font-size:.8rem}
  .nav-account .acct-dashboard{padding:6px 12px;font-size:.8rem}
}

/* ---------- layout ---------- */
main{max-width:var(--maxw);margin:0 auto;padding:clamp(34px,6vw,72px) clamp(18px,4vw,40px) 140px}
.kicker{font-family:var(--mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:18px;display:flex;align-items:center;gap:10px}
.kicker::before{content:"";width:26px;height:1px;background:var(--accent)}
h1.display{font-family:var(--disp);font-weight:800;font-size:clamp(2.5rem,6vw,4.6rem);line-height:.98;letter-spacing:-.025em;max-width:16ch;overflow-wrap:break-word;hyphens:auto;-webkit-hyphens:auto}
.lede{color:var(--txt-2);font-size:clamp(1.05rem,1.6vw,1.32rem);max-width:62ch;margin-top:22px;line-height:1.6}
.preview-note{margin-top:26px;display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:.74rem;color:var(--txt-3);
  border:1px dashed var(--line-2);border-radius:99px;padding:8px 15px}
.preview-note b{color:var(--accent)}

/* ---------- trust strip ---------- */
.trust-strip{
  display:flex;flex-wrap:wrap;gap:0;margin-top:38px;
  border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden;
  background:var(--surface);opacity:0;transform:translateY(10px);transition:.5s var(--ease)
}
.trust-strip.in{opacity:1;transform:none}
.trust-item{
  flex:1;min-width:140px;padding:14px 20px;
  display:flex;flex-direction:column;gap:3px;
  border-right:1px solid var(--line);
  position:relative
}
.trust-item:last-child{border-right:none}
.trust-item .ti-val{
  font-family:var(--disp);font-weight:800;font-size:1.3rem;
  letter-spacing:-.02em;color:var(--txt);line-height:1
}
.trust-item .ti-lbl{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--txt-3)
}
.trust-item.ti-accent .ti-val{color:var(--accent)}
.trust-item.ti-good .ti-val{color:var(--good)}
.trust-item.ti-steel .ti-val{color:var(--steel)}
@media(max-width:640px){
  .trust-strip{flex-direction:column}
  .trust-item{border-right:none;border-bottom:1px solid var(--line);min-width:0;padding:12px 18px;flex-direction:row;align-items:center;justify-content:space-between}
  .trust-item:last-child{border-bottom:none}
}

/* ---------- catalog cards ---------- */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:54px}
@media(max-width:760px){.cards{grid-template-columns:1fr}}
.card{position:relative;border:1px solid var(--line);background:linear-gradient(180deg,var(--surface),var(--bg-1));
  border-radius:var(--r-l);padding:30px 30px 26px;cursor:pointer;overflow:hidden;transition:.4s var(--ease);
  opacity:0;transform:translateY(22px)}
.card.in{opacity:1;transform:none}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(420px 200px at var(--mx,80%) -10%, var(--lvl,var(--accent-glow)), transparent 65%);opacity:0;transition:opacity .4s}
.card:hover{transform:translateY(-6px);border-color:var(--line-2);box-shadow:0 30px 60px -28px rgba(0,0,0,.8)}
.card:hover::after{opacity:.5}
.card .cnum{font-family:var(--disp);font-weight:800;font-size:3.4rem;line-height:1;color:transparent;-webkit-text-stroke:1.3px var(--line-2);position:absolute;top:22px;right:26px;transition:.4s}
.card:hover .cnum{-webkit-text-stroke-color:var(--lvl,var(--accent))}
.lvl{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--txt-2)}
.lvl .dot{width:8px;height:8px;border-radius:99px;background:var(--lvl,var(--accent));box-shadow:0 0 10px var(--lvl,var(--accent))}
.card h3{font-family:var(--disp);font-weight:700;font-size:1.62rem;line-height:1.1;letter-spacing:-.01em;margin:18px 0 12px;max-width:15ch}
.card p{color:var(--txt-2);font-size:.97rem;line-height:1.55;max-width:46ch;display:-webkit-box;-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.meta{display:flex;gap:16px;margin-top:20px;font-family:var(--mono);font-size:.72rem;color:var(--txt-3);flex-wrap:wrap}
.meta span{display:inline-flex;align-items:center;gap:6px}
.meta b{color:var(--txt-2);font-weight:400}
.cardprog{margin-top:20px}
.cardprog .track{height:6px;background:var(--line-2);border-radius:99px;overflow:hidden}
.cardprog .fill{height:100%;background:linear-gradient(90deg,var(--lvl,var(--accent)),var(--accent-2));width:0;border-radius:99px;transition:width 1s var(--ease)}
.cardprog .lbl{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.68rem;color:var(--txt-3);margin-top:9px}
.go{margin-top:22px;display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:.78rem;letter-spacing:.05em;color:var(--accent)}
.go .arr{transition:transform .3s var(--spring)}
.card:hover .go .arr{transform:translateX(6px)}

/* ---------- breadcrumb / back ---------- */
.back{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.76rem;color:var(--txt-3);margin-bottom:30px;transition:.25s}
.back:hover{color:var(--accent);gap:11px}

/* ---------- course page ---------- */
.chero{border-bottom:1px solid var(--line);padding-bottom:38px;margin-bottom:40px}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.chip{font-family:var(--mono);font-size:.72rem;color:var(--txt-2);border:1px solid var(--line-2);border-radius:99px;padding:7px 13px;background:var(--surface)}
.chip b{color:var(--accent);font-weight:400}
.glist{display:flex;flex-direction:column;gap:0;margin-top:8px}
.lrow{display:grid;grid-template-columns:54px 1fr auto;align-items:center;gap:18px;padding:20px 20px;border:1px solid transparent;border-bottom:1px solid var(--line);
  cursor:pointer;transition:.28s var(--ease);border-radius:var(--r-m);opacity:0;transform:translateX(-12px)}
.lrow.in{opacity:1;transform:none}
.lrow:hover{background:var(--surface);border-color:var(--line-2);transform:translateX(4px)}
.lrow .ln{font-family:var(--mono);font-size:.92rem;color:var(--txt-3)}
.lrow:hover .ln{color:var(--accent)}
.lrow .lt{font-family:var(--disp);font-weight:600;font-size:1.12rem;line-height:1.25;letter-spacing:-.01em}
.lrow .lsub{font-family:var(--mono);font-size:.7rem;color:var(--txt-3);margin-top:5px;display:flex;gap:12px;flex-wrap:wrap}
.lrow .status{width:30px;height:30px;border-radius:99px;border:1.5px solid var(--line-2);display:grid;place-items:center;font-size:.8rem;color:var(--txt-3);flex:none;transition:.3s}
.lrow .status.done{background:var(--good);border-color:var(--good);color:#021}
.lrow.interlude .ln{color:var(--steel)}
.lrow.interlude .lt::after{content:"INTERLUDE";font-family:var(--mono);font-size:.6rem;letter-spacing:.1em;color:var(--steel);border:1px solid var(--steel);border-radius:4px;padding:1px 6px;margin-left:10px;vertical-align:middle}

/* ---------- lesson page ---------- */
.lwrap{max-width:860px;margin:0 auto}
.lhead .obj{margin-top:26px;border-left:3px solid var(--accent);background:var(--accent-dim);border-radius:0 var(--r-m) var(--r-m) 0;padding:18px 22px}
.lhead .obj .t{font-family:var(--mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:7px}
.lhead .obj p{color:var(--txt);font-size:1.04rem;line-height:1.55}
.lmeta{display:flex;gap:18px;font-family:var(--mono);font-size:.72rem;color:var(--txt-3);margin-top:20px;flex-wrap:wrap}
.section-t{font-family:var(--mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--txt-3);margin:46px 0 16px;display:flex;align-items:center;gap:12px}
.section-t::after{content:"";flex:1;height:1px;background:var(--line)}
.idea{font-family:var(--body);font-size:1.18rem;line-height:1.7;color:var(--txt);border-radius:var(--r-m);
  background:linear-gradient(180deg,var(--surface),transparent);border:1px solid var(--line);padding:24px 26px}
.idea em,.idea i{color:var(--accent-2);font-style:italic}
.facts{list-style:none;display:flex;flex-direction:column;gap:14px}
.facts li{position:relative;padding:16px 18px 16px 46px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);
  color:var(--txt-2);font-size:1rem;line-height:1.6}
.facts li::before{content:"";position:absolute;left:18px;top:23px;width:9px;height:9px;border-radius:2px;background:var(--accent);transform:rotate(45deg);box-shadow:0 0 9px var(--accent)}
.facts li code{font-family:var(--mono);font-size:.84em;background:var(--surface-2);padding:.1em .4em;border-radius:5px;color:var(--accent-2)}
.facts li a{color:var(--txt-3);border-bottom:1px dotted var(--line-2);font-size:.92em}
.facts li strong{color:var(--txt)}

/* figure / diagram */
figure.fig{margin:8px 0 0;border:1px solid var(--line);border-radius:var(--r-l);overflow:hidden;background:
  radial-gradient(circle at 1px 1px, rgba(255,255,255,.03) 1px, transparent 1px) ,linear-gradient(180deg,var(--surface),var(--bg-1));background-size:22px 22px,auto}
figure.fig .figtop{display:flex;justify-content:space-between;align-items:center;padding:12px 18px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--txt-3)}
figure.fig .figtop .fno{color:var(--accent)}
figure.fig .canvas{padding:26px 22px;display:grid;place-items:center}
figure.fig svg{width:100%;height:auto;max-width:680px;display:block}
figure.fig figcaption{padding:14px 20px 18px;border-top:1px solid var(--line);color:var(--txt-3);font-size:.86rem;line-height:1.5}
.svgtext{font-family:var(--mono);font-size:11px;fill:var(--txt-2)}
.svglab{font-family:var(--mono);font-size:10px;fill:var(--txt-3)}
.concept{padding:30px}
.concept .motif{display:flex;gap:10px;margin-bottom:18px}
.concept .motif i{width:11px;height:11px;border-radius:99px;border:1.5px solid var(--accent);display:block;opacity:.5}
.concept .motif i:nth-child(3n){background:var(--accent);opacity:1}
.concept p{color:var(--txt-2);font-size:.96rem;line-height:1.6}

/* ---------- quiz ---------- */
.quiz{margin-top:14px;border:1px solid var(--line-2);border-radius:var(--r-l);background:linear-gradient(180deg,var(--surface),var(--bg-1));padding:30px clamp(20px,4vw,36px)}
.quiz .qhd{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-bottom:6px}
.quiz .qhd h3{font-family:var(--disp);font-weight:700;font-size:1.5rem;letter-spacing:-.01em}
.quiz .qhd .rule{font-family:var(--mono);font-size:.7rem;color:var(--txt-3)}
.q{padding:24px 0;border-bottom:1px solid var(--line)}
.q:last-of-type{border-bottom:none}
.q .qq{font-family:var(--disp);font-weight:600;font-size:1.1rem;line-height:1.4;margin-bottom:16px;display:flex;gap:12px}
.q .qq .qn{color:var(--accent);font-family:var(--mono);font-size:.95rem;flex:none}
.opt{display:flex;align-items:flex-start;gap:13px;padding:13px 16px;border:1px solid var(--line-2);border-radius:var(--r-m);margin-bottom:10px;
  cursor:pointer;transition:.2s var(--ease);background:var(--bg-1);position:relative}
.opt:hover{border-color:var(--txt-3);background:var(--surface-2)}
.opt .mk{width:22px;height:22px;border-radius:7px;border:1.5px solid var(--line-2);flex:none;display:grid;place-items:center;
  font-family:var(--mono);font-size:.74rem;color:var(--txt-3);transition:.2s}
.opt.sel{border-color:var(--accent);background:var(--accent-dim)}
.opt.sel .mk{background:var(--accent);border-color:var(--accent);color:#000}
.opt .otext{font-size:.98rem;color:var(--txt-2);line-height:1.45}
.opt.sel .otext{color:var(--txt)}
.graded .opt{cursor:default}
.opt.correct{border-color:var(--good);background:var(--good-dim)}
.opt.correct .mk{background:var(--good);border-color:var(--good);color:#021}
.opt.wrong{border-color:var(--bad);background:var(--bad-dim)}
.opt.wrong .mk{background:var(--bad);border-color:var(--bad);color:#210}
.expl{font-family:var(--body);font-size:.92rem;color:var(--txt-2);line-height:1.55;margin-top:8px;padding:12px 15px;border-radius:var(--r-s);
  background:var(--surface-2);border-left:2px solid var(--line-2);display:none}
.q.revealed .expl{display:block}
.q.revealed .expl b{color:var(--good)}

.qactions{display:flex;align-items:center;gap:16px;margin-top:26px;flex-wrap:wrap}
.btn{font-family:var(--disp);font-weight:700;font-size:.96rem;letter-spacing:.01em;border:none;border-radius:99px;padding:14px 28px;cursor:pointer;transition:.28s var(--ease);display:inline-flex;align-items:center;gap:9px}
.btn.primary{background:var(--accent);color:#000}
.btn.primary:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:0 14px 30px -12px var(--accent)}
.btn.primary:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.btn.ghost{background:transparent;border:1px solid var(--line-2);color:var(--txt-2)}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}

/* results */
.result{display:flex;align-items:center;gap:22px;margin-top:24px;padding:22px;border-radius:var(--r-l);border:1px solid var(--line-2);background:var(--bg-1);
  opacity:0;transform:translateY(10px);transition:.5s var(--ease)}
.result.in{opacity:1;transform:none}
.ring{--p:0;width:96px;height:96px;flex:none;border-radius:99px;display:grid;place-items:center;
  background:conic-gradient(var(--rc,var(--accent)) calc(var(--p)*1%), var(--line-2) 0)}
.ring .inner{width:78px;height:78px;border-radius:99px;background:var(--bg-1);display:grid;place-items:center;flex-direction:column;font-family:var(--disp);font-weight:800;font-size:1.5rem}
.ring .inner small{font-family:var(--mono);font-weight:400;font-size:.6rem;color:var(--txt-3);letter-spacing:.1em}
.result .rtxt h4{font-family:var(--disp);font-weight:800;font-size:1.3rem;margin-bottom:5px}
.result.pass .rtxt h4{color:var(--good)} .result.fail .rtxt h4{color:var(--warn)}
.result .rtxt p{color:var(--txt-2);font-size:.95rem}

/* lesson footer nav */
.lnav{display:flex;justify-content:space-between;gap:14px;margin-top:60px;padding-top:30px;border-top:1px solid var(--line)}
.lnav a{flex:1;border:1px solid var(--line);border-radius:var(--r-m);padding:18px 22px;transition:.28s var(--ease);background:var(--surface)}
.lnav a:hover{border-color:var(--accent);transform:translateY(-3px)}
.lnav .dir{font-family:var(--mono);font-size:.68rem;color:var(--txt-3);letter-spacing:.1em}
.lnav .nt{font-family:var(--disp);font-weight:600;font-size:1rem;margin-top:6px;color:var(--txt)}
.lnav .next{text-align:right}
.lnav a.disabled{opacity:.35;pointer-events:none}

/* interlude */
.interlude-body{max-width:var(--read);margin:30px auto 0;font-size:1.08rem;line-height:1.8;color:var(--txt-2)}
.interlude-body h2,.interlude-body h3{font-family:var(--disp);color:var(--txt);margin:36px 0 14px;letter-spacing:-.01em}
.interlude-body p{margin:0 0 18px} .interlude-body strong{color:var(--txt)}
.interlude-body a{color:var(--accent);border-bottom:1px solid var(--accent-dim)}
.interlude-body ul,.interlude-body ol{margin:0 0 18px 22px}

.fade{animation:fade .5s var(--ease) both}
@keyframes fade{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
footer.ft{max-width:var(--maxw);margin:0 auto;padding:40px clamp(18px,4vw,40px) 80px;border-top:1px solid var(--line);color:var(--txt-3);font-family:var(--mono);font-size:.72rem;line-height:1.7}
footer.ft b{color:var(--txt-2);font-weight:400}

/* ---------- full lesson content (prose) ---------- */
.lesson-content{font-size:1.06rem;line-height:1.82;color:var(--txt-2)}
.lesson-content > *:first-child{margin-top:0}
.lesson-content h2{font-family:var(--disp);font-weight:700;font-size:1.55rem;color:var(--txt);margin:40px 0 14px;letter-spacing:-.01em;line-height:1.18}
.lesson-content h3{font-family:var(--disp);font-weight:600;font-size:1.2rem;color:var(--txt);margin:28px 0 10px}
.lesson-content p{margin:0 0 18px;max-width:76ch}
.lesson-content ul,.lesson-content ol{margin:0 0 20px 20px}
.lesson-content li{margin:.45rem 0;max-width:74ch}
.lesson-content strong{color:var(--txt);font-weight:600}
.lesson-content em{color:var(--accent-2)}
.lesson-content code{font-family:var(--mono);font-size:.84em;background:var(--surface-2);padding:.12em .42em;border-radius:5px;color:var(--accent-2)}
.lesson-content pre{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-m);padding:16px 18px;overflow-x:auto;margin:0 0 20px}
.lesson-content pre code{background:none;padding:0;color:var(--txt-2)}
.lesson-content a{color:var(--accent);border-bottom:1px solid var(--accent-dim)}
.lesson-content a:hover{border-bottom-color:var(--accent)}
.lesson-content blockquote{margin:20px 0;padding:12px 20px;border-left:3px solid var(--accent);background:var(--surface);color:var(--txt-2);border-radius:0 var(--r-s) var(--r-s) 0}
.lesson-content table{border-collapse:collapse;width:100%;margin:20px 0;font-size:.92rem}
.lesson-content th,.lesson-content td{border:1px solid var(--line-2);padding:.55rem .8rem;text-align:left;vertical-align:top}
.lesson-content th{background:var(--surface-2);color:var(--txt);font-family:var(--disp);font-weight:600}
.lesson-content hr{border:none;border-top:1px solid var(--line);margin:30px 0}

/* ---------- per-lesson sources ---------- */
.sources{list-style:none;display:flex;flex-direction:column;gap:9px;padding:4px 0}
.sources li{font-family:var(--mono);font-size:.8rem;color:var(--txt-3);line-height:1.55;padding-left:20px;position:relative}
.sources li::before{content:"\00A7";position:absolute;left:0;color:var(--accent)}
.sources li a{color:var(--txt-2);border-bottom:1px dotted var(--line-2);word-break:break-word}
.sources li a:hover{color:var(--accent)}
.sources li strong{color:var(--txt-2);font-weight:400}

/* ---------- accounts: sign-in CTA, quiz CTA, certificates ---------- */
.signin-cta{margin-top:26px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;
  border:1px solid var(--line-2);background:linear-gradient(180deg,var(--surface),var(--bg-1));
  border-radius:var(--r-l);padding:22px 24px;opacity:0;transform:translateY(10px);transition:.5s var(--ease)}
.signin-cta.in{opacity:1;transform:none}
.signin-cta .sc-txt{max-width:60ch}
.signin-cta .sc-txt b{display:block;font-family:var(--disp);font-weight:700;font-size:1.05rem;color:var(--txt);margin-bottom:6px}
.signin-cta .sc-txt span{color:var(--txt-2);font-size:.95rem;line-height:1.55}
.signin-cta .sc-btns{display:flex;gap:10px;flex-wrap:wrap}
.signin-cta .btn{text-decoration:none}
@media(max-width:620px){.signin-cta{flex-direction:column;align-items:flex-start}}

/* Gated lesson body: shown to logged-out learners in place of the material. */
.lgate{margin:30px 0;border:1px solid var(--line-2);border-radius:var(--r-l);
  background:linear-gradient(180deg,var(--surface),var(--bg-1));padding:40px 28px;text-align:center}
.lgate-ic{font-size:2rem;line-height:1;margin-bottom:14px}
.lgate h3{font-family:var(--disp);font-weight:700;font-size:1.4rem;color:var(--txt);margin:0 0 10px}
.lgate p{color:var(--txt-2);font-size:1rem;line-height:1.6;max-width:54ch;margin:0 auto 20px}
.lgate .sc-btns{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.lgate .btn{text-decoration:none}
.lgate-load{margin:40px 0;color:var(--txt-3);font-family:var(--mono);font-size:.85rem;letter-spacing:.04em}

/* ===== Lesson: one wide reading column + a burger lesson menu =====
   The lesson list is collapsed behind a burger on EVERY screen size and slides
   in as a left drawer when opened. The content is a single, comfortably wide
   centered reading column, like a normal online course. */
.lesson-layout{display:block}
.lesson-main{max-width:1000px;margin:0 auto;min-width:0}
.lesson-main .lesson-content p,.lesson-main .lesson-content li{max-width:none}
@media(max-width:560px){.lesson-main{max-width:100%}}

/* Burger toggle: shown on all widths */
.lsb-toggle{display:inline-flex;align-items:center;gap:11px;margin-bottom:22px;
  border:1px solid var(--line-2);background:var(--surface);border-radius:var(--r-m);
  padding:10px 17px;font-family:var(--mono);font-size:.75rem;letter-spacing:.05em;color:var(--txt);cursor:pointer;transition:.2s var(--ease)}
.lsb-toggle:hover{border-color:var(--accent);color:var(--accent)}
.lsb-toggle .bz{position:relative;display:block;color:var(--accent)}
.lsb-toggle .bz,.lsb-toggle .bz::before,.lsb-toggle .bz::after{width:16px;height:2px;background:currentColor;border-radius:2px}
.lsb-toggle .bz::before{content:"";position:absolute;top:-5px;left:0}
.lsb-toggle .bz::after{content:"";position:absolute;top:5px;left:0}

/* Lesson list: always a left drawer, off-screen until opened */
.lesson-sidebar{position:fixed;top:0;left:0;bottom:0;width:min(86vw,360px);z-index:120;
  overflow-y:auto;overscroll-behavior:contain;background:var(--surface);border-right:1px solid var(--line-2);
  padding:18px 14px;transform:translateX(-105%);transition:transform .3s var(--ease);scrollbar-width:thin}
body.sb-open .lesson-sidebar{transform:none;box-shadow:0 0 60px rgba(0,0,0,.6)}
.lsb-head{padding:6px 8px 14px;border-bottom:1px solid var(--line);margin-bottom:10px}
.lsb-back{display:block;font-family:var(--disp);font-weight:600;font-size:.96rem;color:var(--txt);margin-bottom:6px;line-height:1.25}
.lsb-back:hover{color:var(--accent)}
.lsb-meta{font-family:var(--mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--txt-3);margin-bottom:12px}
.lsb-prog{font-family:var(--mono);font-size:.66rem;color:var(--txt-3)}
.lsb-bar{height:5px;background:var(--line-2);border-radius:99px;overflow:hidden;margin-bottom:7px}
.lsb-bar i{display:block;height:100%;background:var(--accent);border-radius:99px;transition:width .5s var(--ease)}
.lsb-list{display:flex;flex-direction:column;gap:1px;margin-bottom:8px}
.lsb-item{display:flex;align-items:flex-start;gap:9px;padding:9px 10px;border-radius:var(--r-s);
  font-size:.85rem;line-height:1.34;color:var(--txt-2);transition:.16s var(--ease);border:1px solid transparent}
.lsb-item:hover{background:var(--surface-2);color:var(--txt)}
.lsb-item.active{background:var(--accent-dim);border-color:var(--accent);color:var(--txt)}
.lsb-item .lsb-n{font-family:var(--mono);font-size:.7rem;color:var(--txt-3);flex:none;min-width:30px;padding-top:1px}
.lsb-item.active .lsb-n{color:var(--accent)}
.lsb-item.done .lsb-n{color:#28c840}
.lsb-item .lsb-t{flex:1;min-width:0}
.lsb-item .lsb-x{color:#28c840;flex:none;font-size:.8rem}
.lsb-all{display:block;padding:9px 10px;font-family:var(--mono);font-size:.72rem;color:var(--txt-3);border-top:1px solid var(--line)}
.lsb-all:hover{color:var(--accent)}
/* Backdrop behind the open drawer (all widths) */
.sb-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:115;opacity:0;pointer-events:none;transition:opacity .3s var(--ease)}
body.sb-open .sb-backdrop{opacity:1;pointer-events:auto}

.quiz-cta{margin:0 0 18px;font-size:.92rem;color:var(--txt-3);font-family:var(--mono)}
.quiz-cta a{color:var(--accent);border-bottom:1px solid var(--accent-dim)}
.quiz-cta a:hover{border-bottom-color:var(--accent)}

.cert-panel{margin-top:34px;border:1px solid var(--line-2);background:linear-gradient(180deg,var(--surface),var(--bg-1));
  border-radius:var(--r-l);padding:26px 26px;opacity:0;transform:translateY(10px);transition:.5s var(--ease)}
.cert-panel.in{opacity:1;transform:none}
.cert-panel .cp-head{font-family:var(--mono);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.cert-panel p{color:var(--txt-2);font-size:.96rem;line-height:1.6;max-width:62ch;margin:0 0 16px}
.cert-panel a{color:var(--accent);border-bottom:1px solid var(--accent-dim)}
.cert-panel a.btn{border-bottom:none;text-decoration:none}
.cert-panel a:hover{border-bottom-color:var(--accent)}
.cert-panel .cp-actions{display:flex;gap:10px;flex-wrap:wrap}

.cert-err{color:var(--bad);font-size:.92rem;margin-top:14px;font-family:var(--mono)}

/* ---------- certificate card (premium redesign) ---------- */
.cert-card{
  margin-top:18px;
  border:1px solid color-mix(in srgb, var(--good) 40%, var(--line));
  background:linear-gradient(160deg,var(--surface) 0%,var(--good-dim) 100%);
  border-radius:var(--r-l);overflow:hidden;
  opacity:0;transform:translateY(12px);transition:.55s var(--ease)
}
.cert-card.in{opacity:1;transform:none}
/* top ruled accent bar */
.cert-card::before{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,var(--good),var(--steel),var(--accent))
}
.cert-card-inner{padding:30px 30px 26px}
.cert-card .cc-header{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:26px;flex-wrap:wrap}
.cert-card .cc-issuer{display:flex;flex-direction:column;gap:4px}
.cert-card .cc-badge{
  font-family:var(--mono);font-size:.65rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--good);display:flex;align-items:center;gap:7px
}
.cert-card .cc-badge::before{
  content:"";width:8px;height:8px;border-radius:99px;
  background:var(--good);box-shadow:0 0 8px var(--good);display:block
}
.cert-card .cc-issuer-name{
  font-family:var(--disp);font-weight:800;font-size:1.35rem;
  letter-spacing:-.02em;color:var(--txt)
}
.cert-card .cc-seal{
  width:52px;height:52px;border-radius:99px;
  border:1.5px solid color-mix(in srgb,var(--good) 50%,var(--line));
  display:grid;place-items:center;flex:none;
  background:var(--good-dim)
}
.cert-card .cc-seal svg{width:26px;height:26px}
/* divider */
.cert-card .cc-divider{height:1px;background:var(--line);margin:0 0 22px}
/* course title */
.cert-card .cc-course{
  font-family:var(--disp);font-weight:700;font-size:1.55rem;
  letter-spacing:-.02em;color:var(--txt);line-height:1.15;margin-bottom:8px
}
/* holder */
.cert-card .cc-holder-label{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--txt-3);margin-bottom:4px
}
.cert-card .cc-holder{
  font-family:var(--disp);font-weight:700;font-size:1.15rem;color:var(--accent);
  margin-bottom:18px
}
/* meta grid */
.cert-card .cc-meta{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:14px 22px;margin-bottom:22px
}
.cert-card .cc-meta-item{display:flex;flex-direction:column;gap:3px}
.cert-card .cc-meta-item .cm-label{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--txt-3)
}
.cert-card .cc-meta-item .cm-val{
  font-family:var(--mono);font-size:.9rem;color:var(--txt-2)
}
.cert-card .cc-meta-item .cm-val b{color:var(--txt);font-weight:400}
.cert-card .cc-meta-item .cm-val code{
  font-family:var(--mono);font-size:.78rem;color:var(--txt-2);
  word-break:break-all;display:block
}
/* signature note */
.cert-card .cc-sig{
  font-family:var(--mono);font-size:.72rem;color:var(--txt-3);
  line-height:1.55;padding:12px 14px;
  border:1px solid var(--line);border-radius:var(--r-s);
  background:var(--bg-1);margin-bottom:22px;
  display:flex;align-items:flex-start;gap:10px
}
.cert-card .cc-sig::before{
  content:"";width:12px;height:12px;flex:none;margin-top:1px;
  background:conic-gradient(var(--steel) 120deg,var(--accent) 240deg,var(--good) 360deg);
  border-radius:2px;transform:rotate(15deg)
}
/* actions */
.cert-card .cc-actions{display:flex;gap:10px;flex-wrap:wrap}
.cert-card .cc-actions .btn{text-decoration:none}
/* download canvas (hidden) */
#cert-canvas{display:none}
.cert-card2{opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s ease;margin-top:10px}
.cert-card2.in{opacity:1;transform:none}
.cert-render{width:100%;height:auto;display:block;border-radius:14px;box-shadow:0 12px 44px rgba(0,0,0,.34)}

/* ---------- quiz pass celebration ---------- */
@media(prefers-reduced-motion:no-preference){
  .result.pass.celebrate{animation:celebrate-pop .55s var(--spring) both}
  @keyframes celebrate-pop{
    0%{transform:scale(.92);opacity:0}
    60%{transform:scale(1.025)}
    100%{transform:scale(1);opacity:1}
  }
  .result.pass.celebrate .ring{animation:ring-glow 1.4s var(--ease) .4s both}
  @keyframes ring-glow{
    0%{box-shadow:0 0 0 0 rgba(40,200,64,0)}
    50%{box-shadow:0 0 0 8px rgba(40,200,64,.18)}
    100%{box-shadow:0 0 0 0 rgba(40,200,64,0)}
  }
}
.result.pass .rtxt h4::after{content:" ✓";font-size:.9em;opacity:.7}

/* ---------- mobile polish: quiz result, lesson nav, paddings (<=560px) ---------- */
@media(max-width:560px){
  .result{flex-direction:column;align-items:flex-start;text-align:left;gap:16px;padding:20px}
  .lnav{flex-direction:column;gap:12px;margin-top:44px}
  .lnav .next{text-align:left}
  .quiz{padding:24px 16px}
  .quiz .qhd{flex-wrap:wrap;gap:6px}
  .quiz .qhd h3{font-size:1.3rem}
  .q .qq{font-size:1.02rem;gap:9px}
  .cert-card-inner{padding:22px 18px}
  .cert-panel,.signin-cta{padding:20px 18px}
  .cert-card .cc-course{font-size:1.3rem}
  .lesson-content h2{font-size:1.34rem}
  figure.fig figcaption{font-size:.8rem}
}

/* Hero scales down on phones. MUST live after the base h1.display rule (which
   sits earlier in the file) so it wins the cascade at equal specificity. */
@media(max-width:520px){
  h1.display{font-size:clamp(1.9rem,7.8vw,2.6rem);letter-spacing:-.03em;max-width:100%}
  .lede{font-size:1.02rem}
}