:root{
  --ink:#0d0d0d; --paper:#ffffff; --soft:#f4f4f4; --line:#e5e5e5;
  --mid:#8a8a8e; --orange:#FF4D00; --panel:#1c1c1f; --key:#2a2a2e;
}
*{box-sizing:border-box; margin:0; padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
  background:var(--paper); color:var(--ink);
  font-size:15px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:980px; margin:0 auto; padding:0 28px}
a{color:var(--ink)}
h1,h2,h3,h4{font-weight:600; letter-spacing:-.01em}
p{max-width:72ch}

/* ---------- top nav ---------- */
nav{
  position:sticky; top:0; z-index:50; background:rgba(255,255,255,.95);
  backdrop-filter:blur(8px); border-bottom:1px solid var(--line);
}
nav .wrap{display:flex; align-items:center; gap:18px; height:52px}
nav .brand{font-weight:700; font-size:14px; white-space:nowrap}
nav .brand span{color:var(--orange)}
nav .links{display:flex; gap:14px; overflow-x:auto; font-size:13px; color:var(--mid)}
nav .links a{color:var(--mid); text-decoration:none; white-space:nowrap}
nav .links a:hover{color:var(--ink)}
#progressWrap{margin-left:auto; display:flex; align-items:center; gap:8px; font-size:12px; color:var(--mid); white-space:nowrap}
#progressBar{width:90px; height:4px; background:var(--line); border-radius:2px; overflow:hidden}
#progressBar i{display:block; height:100%; width:0%; background:var(--orange); transition:width .3s}

/* ---------- hero ---------- */
header.hero{padding:64px 0 36px; border-bottom:1px solid var(--line)}
header.hero .cols{display:flex; gap:40px; align-items:center; flex-wrap:wrap}
header.hero img{width:300px; max-width:100%; border-radius:8px}
header.hero h1{font-size:42px; line-height:1.05; margin-bottom:14px}
header.hero h1 em{font-style:normal; color:var(--orange)}
header.hero p.sub{color:var(--mid); font-size:16px; max-width:54ch}
.meta{margin-top:18px; font-size:12px; color:var(--mid)}
.meta a{color:var(--mid)}
.accnote{margin-top:16px; border:1.5px dashed #cfcfcf; border-radius:10px; padding:10px 14px; font-size:12.5px; color:#555; max-width:62ch; line-height:1.5}
.accnote b{color:var(--ink)}
.accnote a{color:var(--orange)}

/* ---------- section scaffolding ---------- */
section.block{padding:52px 0; border-bottom:1px solid var(--line)}
.kicker{font-size:12px; text-transform:lowercase; letter-spacing:.12em; color:var(--orange); font-weight:700; margin-bottom:8px}
section.block>.wrap>h2{font-size:28px; margin-bottom:10px}
.lede{color:var(--mid); margin-bottom:26px; max-width:64ch}

/* numbered circle badge, TE style */
.badge{
  display:inline-flex; width:26px; height:26px; border-radius:50%;
  background:var(--line); color:var(--ink); font-size:13px; font-weight:600;
  align-items:center; justify-content:center; flex:none;
}
.badge.orange{background:var(--orange); color:#fff}

/* ---------- key / button chips ---------- */
.k{
  display:inline-flex; align-items:center; justify-content:center;
  min-width:22px; height:22px; padding:0 8px; border-radius:6px;
  background:var(--key); color:#f3f3f3; font-size:11.5px; font-weight:600;
  vertical-align:-5px; letter-spacing:.02em; white-space:nowrap;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.45), 0 1px 1px rgba(0,0,0,.15);
  margin:0 1px;
}
.k.km{border-radius:50%; min-width:24px; width:24px; padding:0}      /* M1-M4 */
.k.ktr{border-radius:50%; min-width:24px; width:24px; padding:0; background:#3a3a40}
.k.kw{background:#e9e9e9; color:#222; box-shadow:inset 0 -2px 0 rgba(0,0,0,.18), 0 1px 1px rgba(0,0,0,.1)}
.k.kacc{background:#111; border:1px solid #3c3c42}
.k.krec{background:#2a2a2e; color:#fff}
.k.krec::before{content:""; width:8px; height:8px; border-radius:50%; background:var(--orange); margin-right:5px}
.k.kplay::before{content:"▶"; font-size:9px; margin-right:0px}
.k.kstop::before{content:"■"; font-size:9px; margin-right:0px}
.k.kplay,.k.kstop{padding:0 9px}
.k.kplay::after,.k.kstop::after{content:none}
.enc{
  display:inline-block; width:15px; height:15px; border-radius:50%;
  vertical-align:-2px; border:1px solid rgba(0,0,0,.35); margin:0 2px;
  box-shadow:inset -2px -2px 3px rgba(0,0,0,.25);
}
.enc.dark{background:#3b3b41}.enc.mid{background:#77777d}.enc.light{background:#b9b9bd}.enc.white{background:#f4f4f4}
.encname{font-size:12px; color:var(--mid)}

/* ---------- cards / tables ---------- */
.cardgrid{display:grid; grid-template-columns:repeat(auto-fill,minmax(210px,1fr)); gap:14px}
.card{border:1px solid var(--line); border-radius:10px; padding:16px; background:#fff}
.card h4{font-size:14px; margin-bottom:6px}
.card p{font-size:13px; color:#444}
.card .term{display:flex; gap:10px; align-items:center; margin-bottom:8px}

table.t{width:100%; border-collapse:collapse; font-size:13.5px}
table.t th{ text-align:left; font-size:11px; letter-spacing:.1em; text-transform:lowercase; color:var(--mid); font-weight:600; padding:8px 10px; border-bottom:2px solid var(--ink)}
table.t td{padding:9px 10px; border-bottom:1px solid var(--line); vertical-align:top}
table.t tr td:first-child{white-space:nowrap}

/* ---------- roadmap ---------- */
.roadmap{display:grid; grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:10px}
.roadmap .wk{border:1px solid var(--line); border-radius:10px; padding:12px}
.roadmap .wk b{display:block; font-size:12px; color:var(--orange); margin-bottom:2px}
.roadmap .wk span{font-size:13px; font-weight:600; display:block}
.roadmap .wk em{font-style:normal; font-size:12px; color:var(--mid)}

/* ---------- week & session ---------- */
.weekhead{display:flex; align-items:baseline; gap:14px; margin:0 0 6px}
.weekhead .wno{font-size:13px; font-weight:700; color:var(--orange); letter-spacing:.08em}
.weekhead h2{font-size:26px}
.weekgoal{color:var(--mid); margin-bottom:22px; max-width:64ch}

details.session{border:1px solid var(--line); border-radius:12px; margin-bottom:14px; background:#fff; overflow:hidden}
details.session[open]{box-shadow:0 1px 6px rgba(0,0,0,.05)}
details.session>summary{
  list-style:none; cursor:pointer; display:flex; align-items:center; gap:14px;
  padding:16px 18px; user-select:none;
}
details.session>summary::-webkit-details-marker{display:none}
details.session>summary .sno{
  flex:none; width:34px; height:34px; border-radius:50%; background:var(--line);
  display:flex; align-items:center; justify-content:center; font-weight:700; font-size:14px;
}
details.session[open]>summary .sno{background:var(--orange); color:#fff}
details.session>summary .stitle{font-weight:600; font-size:16px}
details.session>summary .ssub{font-size:12.5px; color:var(--mid); display:block; font-weight:400}
details.session>summary .chev{margin-left:auto; color:var(--mid); transition:transform .2s; flex:none}
details.session[open]>summary .chev{transform:rotate(90deg)}
.done-toggle{
  flex:none; width:22px; height:22px; border-radius:6px; border:2px solid #cfcfcf;
  background:#fff; cursor:pointer; position:relative;
}
.done-toggle.on{background:var(--orange); border-color:var(--orange)}
.done-toggle.on::after{content:"✓"; color:#fff; font-size:13px; font-weight:700; position:absolute; inset:0; display:flex; align-items:center; justify-content:center}
details.session.isdone>summary .stitle{color:var(--mid); text-decoration:line-through; text-decoration-thickness:1px}

.sbody{padding:4px 20px 20px}
.goal{
  background:var(--soft); border-radius:10px; padding:12px 16px; margin-bottom:18px;
  font-size:14px; max-width:none;
}
.goal b{color:var(--orange); font-size:11px; letter-spacing:.1em; display:block; margin-bottom:2px}

ol.steps{list-style:none; counter-reset:st}
ol.steps>li{
  counter-increment:st; position:relative; padding:14px 0 14px 46px;
  border-top:1px dashed var(--line);
}
ol.steps>li:first-child{border-top:none}
ol.steps>li::before{
  content:counter(st); position:absolute; left:0; top:14px;
  width:28px; height:28px; border-radius:50%; background:var(--line);
  display:flex; align-items:center; justify-content:center; font-size:13px; font-weight:700;
}
.do{font-size:14.5px; margin-bottom:3px}
.why{font-size:13px; color:var(--mid); max-width:70ch}
.why b{color:#444; font-weight:600}
.listen{font-size:13px; color:#444; margin-top:4px}
.listen::before{content:"♪ Listen: "; color:var(--orange); font-weight:700; font-size:12px}
.viz{margin:12px 0 4px; overflow-x:auto}
.viz svg{display:block}
.vizcap{font-size:12px; color:var(--mid); margin-top:6px}

.sfoot{display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:12px; margin-top:18px}
.sfoot .fcell{border:1px solid var(--line); border-radius:10px; padding:12px 14px; font-size:13px}
.sfoot .fcell b{display:block; font-size:11px; letter-spacing:.06em; margin-bottom:4px}
.fcell.assign b{color:var(--orange)}
.fcell.ready b{color:#0a9b57}
.fcell.fix b{color:#b6890a}
.fcell.challenge b{color:#0d0d0d}

.warm{display:flex; gap:12px; align-items:baseline; border:1px dashed #d9d9d9; border-radius:10px; padding:10px 14px; margin-bottom:14px; font-size:13.5px}
.warm b{flex:none; font-size:11px; letter-spacing:.1em; color:var(--orange); font-weight:700}

aside.story{border-left:3px solid var(--orange); background:var(--soft); padding:12px 16px 12px 14px; border-radius:0 10px 10px 0; margin:0 0 18px}
aside.story b{display:block; font-size:11px; letter-spacing:.12em; color:var(--orange); font-weight:700; margin-bottom:4px}
aside.story p{font-size:13.5px; color:#3c3c3c; max-width:78ch}

.remember{margin-top:14px; font-size:14.5px; font-weight:600; display:flex; gap:10px; align-items:baseline}
.remember::before{content:"Remember"; flex:none; color:#fff; background:var(--orange); font-size:10px; font-weight:700; letter-spacing:.08em; padding:3px 8px; border-radius:20px}

details.quiz{border:1px solid var(--line); border-radius:10px; margin-bottom:8px; background:#fff}
details.quiz summary{list-style:none; cursor:pointer; padding:10px 14px; font-size:13.5px; display:flex; gap:10px; align-items:baseline}
details.quiz summary::-webkit-details-marker{display:none}
details.quiz summary::before{content:"?"; flex:none; width:20px; height:20px; border-radius:50%; background:var(--ink); color:#fff; font-weight:700; font-size:12px; display:flex; align-items:center; justify-content:center}
details.quiz .qa{padding:0 14px 12px 44px; font-size:13.5px; color:#444}
details.quiz .qa::before{content:"→ "; color:var(--orange); font-weight:700}
.nicelist{margin:4px 0 0; padding:0; list-style:none}
.nicelist li{padding:7px 0 7px 22px; position:relative; font-size:13.5px; color:#444; max-width:78ch}
.nicelist li::before{content:""; position:absolute; left:4px; top:14px; width:7px; height:7px; border-radius:50%; background:var(--orange)}
.trackmap{display:grid; grid-template-columns:repeat(auto-fill,minmax(200px,1fr)); gap:9px 16px; font-size:13px}
.trackmap div{display:flex; gap:9px; align-items:center}

/* ---------- device map ---------- */
#devmap svg{width:100%; height:auto}
.maplegend{display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:6px 22px; margin-top:22px}
.maplegend .li{display:flex; gap:10px; font-size:13px; padding:7px 8px; border-radius:8px; align-items:flex-start; cursor:default}
.maplegend .li:hover{background:var(--soft)}
.maplegend .li b{font-weight:600}
.maplegend .li span{color:var(--mid)}

/* ---------- notes ---------- */
.notesbox{width:100%; min-height:74px; border:1px solid var(--line); border-radius:10px; padding:10px 12px; font:inherit; font-size:13px; resize:vertical; background:var(--soft)}
.noteslabel{font-size:11px; letter-spacing:.1em; color:var(--mid); font-weight:700; margin:18px 0 6px}

/* ---------- cheat sheet ---------- */
.cheat{display:grid; grid-template-columns:1fr; gap:8px}
.cheat .row{display:flex; gap:16px; align-items:baseline; padding:9px 4px; border-bottom:1px solid var(--line); font-size:13.5px}
.cheat .row .combo{flex:none; width:330px}
.cheat .row .what{color:#444}
.rules{counter-reset:r; max-width:74ch}
.rules li{list-style:none; counter-increment:r; padding:10px 0 10px 44px; position:relative; border-bottom:1px solid var(--line); font-size:14px}
.rules li::before{content:counter(r); position:absolute; left:0; top:10px; width:26px;height:26px;border-radius:50%; background:var(--ink); color:#fff; display:flex; align-items:center; justify-content:center; font-size:13px; font-weight:700}

footer{padding:40px 0 80px; font-size:12.5px; color:var(--mid)}
footer a{color:var(--mid)}

@media (max-width:700px){
  .cheat .row{flex-direction:column; gap:4px}
  .cheat .row .combo{width:auto}
  header.hero h1{font-size:32px}
}
@media print{
  nav,#progressWrap,.done-toggle{display:none}
  details.session{page-break-inside:avoid}
  section.block{padding:24px 0}
}

/* ---------- multi-page additions ---------- */
.roadmap a.wk{display:block; color:inherit; text-decoration:none}
.roadmap a.wk:hover{border-color:var(--orange)}
.roadmap .wk .prog{display:block; margin-top:6px; color:var(--orange); font-size:11.5px; font-weight:700; font-style:normal}
.pager .wrap{display:flex; justify-content:space-between; align-items:center; gap:14px; padding-top:6px; padding-bottom:46px; flex-wrap:wrap}
.pager a{color:var(--ink); text-decoration:none; border:1px solid var(--line); border-radius:10px; padding:10px 14px; background:#fff; font-size:13.5px; font-weight:600}
.pager a:hover{border-color:var(--orange)}
.accnote.slim{max-width:none; margin:0 0 8px}
@media print{.pager{display:none}}

/* ---------- hear-it demo buttons ---------- */
.hearrow{display:flex; gap:8px; flex-wrap:wrap; align-items:center; margin:12px 0 2px}
.hearit{font:inherit; font-size:12.5px; font-weight:700; color:var(--ink); background:#fff;
  border:1px solid var(--line); border-radius:999px; padding:7px 14px; cursor:pointer}
.hearit:hover{border-color:var(--orange)}
.hearit.playing{background:var(--orange); border-color:var(--orange); color:#fff}
.hearit:disabled{opacity:.5; cursor:default}
.hearnote{font-size:11.5px; color:var(--mid)}
@media print{.hearrow{display:none}}