/* ---------- tokens ---------- */
:root{
  --bg: #0a0a0a;
  --bg-2: #121212;
  --bg-3: #181818;
  --line: #2a2a2a;
  --line-soft: #1d1d1d;
  --ink: #ece6da;
  --ink-soft: #b3aea0;
  --ink-mute: #7a7568;
  --red: #c8202a;
  --red-deep: #8e1620;
  --red-glow: #e84a52;
  --steel: #8a8a8a;
  --bone: #d4cdb8;
  --serif: "Instrument Serif", Georgia, serif;
  --body: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --display: "Oswald", "Impact", sans-serif;
  --maxw: 1120px;
}

*{box-sizing:border-box}
body.acdc-method-page{margin:0;padding:0}
html{scroll-behavior:smooth}
body.acdc-method-page{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(200,32,42,.06), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(232,74,82,.04), transparent 60%),
    var(--bg);
  color:var(--ink);
  font-family:var(--body);
  font-optical-sizing:auto;
  font-weight:360;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

.acdc-method-page img,.acdc-method-page svg{display:block;max-width:100%}
.acdc-method-page main a{color:var(--red-glow);text-decoration:none;border-bottom:1px solid rgba(232,74,82,.3);transition:border-color .2s}
.acdc-method-page main a:hover{border-color:var(--red-glow)}

.container{max-width:var(--maxw);margin:0 auto;padding:0 28px}
@media (max-width:720px){ .container{padding:0 20px} body.acdc-method-page{font-size:16px} }

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:20;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10,10,10,.78);
  border-bottom:1px solid var(--line-soft);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 28px;max-width:var(--maxw);margin:0 auto;
}
.brand{
  font-family:var(--display);
  font-size:20px;letter-spacing:.02em;
  font-weight:700;
  text-transform:uppercase;
  display:flex;align-items:center;gap:10px;
  color:var(--bone);
}
.brand .bolt{width:14px;height:18px;flex:none;color:var(--red)}
.brand .slash{color:var(--red);font-style:italic;font-family:var(--serif);font-weight:400;padding:0 1px}
.nav-links{display:flex;gap:22px;font-family:var(--mono);font-size:12px;color:var(--ink-soft);letter-spacing:.14em;text-transform:uppercase}
.nav-links a{border:none;color:inherit}
.nav-links a:hover{color:var(--red-glow)}
@media (max-width:720px){ .nav-links{display:none} .nav-inner{padding:14px 20px} }

/* ---------- hero ---------- */
.hero{
  position:relative;
  padding: 100px 0 80px;
  overflow:hidden;
  border-bottom:1px solid var(--line-soft);
}
.hero::before{
  content:"";
  position:absolute;inset:0;
  background:
    radial-gradient(600px 400px at 70% 30%, rgba(200,32,42,.10), transparent 70%),
    radial-gradient(700px 500px at 15% 80%, rgba(232,74,82,.06), transparent 70%);
  pointer-events:none;
}
.kicker{
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--red);
  margin-bottom:22px;
}
.hero h1{
  font-family:var(--display);
  font-weight:700;
  font-size: clamp(52px, 9vw, 120px);
  line-height:.95;
  letter-spacing:-.01em;
  margin:0 0 18px;
  color:var(--bone);
  text-transform:uppercase;
}
.hero h1 .slash{
  color:var(--red);
  font-style:italic;
  display:inline-block;
  transform:skewX(-8deg);
  padding:0 2px;
  font-family:var(--display);
}
.hero h1 .sub{
  display:block;
  font-family:var(--serif);
  font-weight:400;
  font-style:italic;
  font-size: clamp(28px, 4vw, 48px);
  line-height:1.05;
  color:var(--red-glow);
  text-transform:none;
  letter-spacing:0;
  margin-top:6px;
}
.hero p.lede{
  font-size: clamp(18px, 1.6vw, 22px);
  line-height:1.55;
  max-width:620px;
  color:var(--ink-soft);
  margin:0 0 40px;
  font-style:italic;
  font-family:var(--serif);
}
.hero-meta{
  display:flex;gap:36px;flex-wrap:wrap;
  font-family:var(--mono);font-size:12px;letter-spacing:.15em;
  text-transform:uppercase;color:var(--ink-mute);
  padding-top:28px;border-top:1px solid var(--line-soft);
  max-width:620px;
}
.hero-meta span strong{color:var(--ink);font-weight:500;display:block;font-family:var(--body);font-size:15px;letter-spacing:normal;text-transform:none;margin-top:4px}

/* hero visual — a lightning bolt + power-chord overlay */
.hero-visual{
  position:absolute; right:-60px; top:140px;
  width: 520px; max-width:46vw;
  opacity:.18;
  pointer-events:none;
  filter: drop-shadow(0 20px 40px rgba(200,32,42,.3));
  transform: rotate(-8deg);
}
@media (max-width:960px){ .hero-visual{opacity:.10; right:-120px; top:200px} }
@media (max-width:640px){ .hero-visual{opacity:.08; top:auto; bottom:-40px; right:-100px; width:400px} }

/* accent line under hero */
.accent-line{
  height:2px;
  background:linear-gradient(90deg,
    transparent 0%,
    var(--red-deep) 15%, var(--red) 35%, var(--red-glow) 50%, var(--red) 65%, var(--red-deep) 85%,
    transparent 100%);
  opacity:.5;margin:0 auto;max-width:var(--maxw);
}

/* ---------- sections ---------- */
section{padding: 88px 0; border-bottom:1px solid var(--line-soft); position:relative}
section:last-of-type{border-bottom:none}
.section-head{
  display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  margin-bottom:48px;flex-wrap:wrap;
}
.section-head h2{
  font-family:var(--display);font-weight:700;
  font-size: clamp(36px, 5.5vw, 64px);line-height:1.0;margin:0;
  letter-spacing:-.005em;
  text-transform:uppercase;
  color:var(--bone);
}
.section-head h2 em{
  font-style:italic;
  color:var(--red-glow);
  font-family:var(--serif);
  font-weight:400;
  text-transform:none;
}
.section-head .section-no{
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink-mute);
}

.two-col{display:grid;grid-template-columns: 1fr 1.3fr;gap:64px;align-items:start}
@media (max-width:840px){ .two-col{grid-template-columns:1fr;gap:40px} }

.prose p{margin:0 0 18px;max-width:60ch}
.prose p.lead{font-size:1.1em;color:var(--ink-soft);font-family:var(--serif);font-style:italic}

/* ---------- gear panel ---------- */
.gear{ background: linear-gradient(180deg, var(--bg-2), var(--bg)); }
.gear-grid{
  display:grid;grid-template-columns: repeat(2, 1fr);gap:1px;
  background:var(--line-soft);
  border:1px solid var(--line-soft);
  margin-top:32px;
}
.gear-card{
  background:var(--bg-2);padding:28px 24px;
}
.gear-card h4{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--red);margin:0 0 10px;font-weight:500;
}
.gear-card .item{
  font-family:var(--serif);font-size:22px;line-height:1.15;margin-bottom:6px;color:var(--ink);
}
.gear-card .note{color:var(--ink-soft);font-size:14px;line-height:1.5;margin-bottom:0}
@media (max-width:640px){ .gear-grid{grid-template-columns:1fr} }

.amp-settings{
  margin-top:40px;
  border:1px solid var(--line-soft);
  background:var(--bg-2);
}
.amp-settings-head{
  padding:18px 24px;border-bottom:1px solid var(--line-soft);
  display:flex;justify-content:space-between;align-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-soft);
}
.amp-row{
  display:grid;grid-template-columns: 140px 1fr;gap:24px;
  padding:22px 24px;border-bottom:1px solid var(--line-soft);align-items:start;
}
.amp-row:last-child{border-bottom:none}
.amp-row .level{
  font-family:var(--serif);font-size:22px;color:var(--red-glow);font-style:italic;
}
.amp-row .settings{color:var(--ink-soft);font-size:15px;line-height:1.6}
.amp-row .settings code{
  font-family:var(--mono);font-size:13px;
  background:var(--bg-3);padding:2px 6px;border-radius:3px;color:var(--ink);
}
@media (max-width:640px){ .amp-row{grid-template-columns:1fr;gap:8px} }

/* ---------- reference: power chord vocabulary ---------- */
.ref-grid{
  display:grid;grid-template-columns: repeat(3, 1fr);gap:16px;
  margin-top:32px;
}
@media (max-width:840px){ .ref-grid{grid-template-columns: repeat(2, 1fr)} }
@media (max-width:560px){ .ref-grid{grid-template-columns: 1fr} }

.ref-item{
  background:var(--bg-2);
  border:1px solid var(--line-soft);
  padding:22px 20px;
  display:flex;flex-direction:column;gap:12px;
}
.ref-item .ref-title{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--red);
}
.ref-item .ref-svg-wrap{
  display:flex;justify-content:center;padding:8px 0;
}
.ref-item svg{height:120px;width:auto}
.ref-item .ref-desc{
  color:var(--ink-soft);font-size:13.5px;line-height:1.5;margin:0;
}

/* notation key */
.notation-key{
  margin-top:32px;
  border:1px solid var(--line-soft);
  background:var(--bg-2);
  padding:24px 28px;
}
.notation-key h4{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--red);margin:0 0 18px;font-weight:500;
}
.notation-row{
  display:grid;grid-template-columns: repeat(5, 1fr);gap:24px;
  font-size:14px;color:var(--ink-soft);
}
@media (max-width:640px){ .notation-row{grid-template-columns: repeat(2, 1fr)} }
.notation-item{display:flex;align-items:center;gap:10px}
.notation-item .glyph{
  font-family:var(--mono);font-size:18px;font-weight:700;color:var(--ink);
  min-width:24px;text-align:center;
}
.notation-item .glyph.red{color:var(--red)}

/* ---------- course tabs ---------- */
.course-nav{
  position:sticky;top:54px;z-index:15;
  background: rgba(10,10,10,.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line-soft);
  padding:14px 0;
  margin:-88px 0 56px;
}
.course-nav-inner{
  display:flex;gap:0;overflow-x:auto;
  max-width:var(--maxw);margin:0 auto;padding:0 28px;
}
.tab{
  background:none;border:none;cursor:pointer;
  font-family:var(--mono);font-size:12px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--ink-mute);padding:10px 20px 12px;
  border-bottom:2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space:nowrap;
}
.tab:hover{color:var(--ink-soft)}
.tab.active{color:var(--red);border-bottom-color:var(--red)}
.tab.locked{opacity:.4;cursor:not-allowed}
.tab.locked:hover{color:var(--ink-mute)}
@media (max-width:720px){ .course-nav-inner{padding:0 20px} }

/* course intro block */
.course-intro{
  display:grid;grid-template-columns: 1fr 2fr;gap:48px;align-items:start;
  padding:32px 32px;
  border:1px solid var(--line-soft);background:var(--bg-2);
  margin-bottom:48px;
}
.course-intro h3{font-family:var(--display);font-size:48px;font-weight:700;margin:0;line-height:.95;color:var(--bone);text-transform:uppercase}
.course-intro h3 .em{color:var(--red-glow);font-style:italic;font-family:var(--serif);font-weight:400;text-transform:none}
.course-intro .label{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--red);margin-bottom:8px}
.course-intro .meta{margin-top:12px;font-family:var(--mono);font-size:12px;color:var(--ink-mute);letter-spacing:.1em}
.course-intro p{margin:0 0 16px;color:var(--ink-soft)}
.course-intro p:last-child{margin-bottom:0}
.course-intro p.lead-line{font-family:var(--serif);font-style:italic;font-size:18px;color:var(--ink);line-height:1.4}
@media (max-width:760px){ .course-intro{grid-template-columns:1fr;gap:20px;padding:24px} .course-intro h3{font-size:36px} }

/* ---------- week card ---------- */
.week{
  margin-bottom:28px;
  border:1px solid var(--line-soft);background:var(--bg-2);
}
.week-head{
  display:grid;grid-template-columns: 90px 1fr auto;gap:24px;align-items:center;
  padding:22px 28px;border-bottom:1px solid var(--line-soft);
}
.week-head .wk{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--red);
}
.week-head h4{
  font-family:var(--serif);font-size:28px;font-weight:400;margin:0;line-height:1.1;color:var(--ink);
}
.week-head .obj{
  font-family:var(--mono);font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--ink-mute);
  text-align:right;max-width:280px;
}
@media (max-width:720px){
  .week-head{grid-template-columns:1fr;gap:10px;padding:20px}
  .week-head .obj{text-align:left;max-width:none}
  .week-head h4{font-size:24px}
}

.week-body{padding:28px}
.week-grid{
  display:grid;grid-template-columns: 1fr 1fr;gap:32px;
}
@media (max-width:760px){ .week-grid{grid-template-columns:1fr;gap:20px} }

.block h5{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--red);margin:0 0 10px;font-weight:500;
}
.block ul{margin:0;padding-left:18px;color:var(--ink-soft)}
.block ul li{margin-bottom:6px}
.block ul li em{color:var(--red-glow);font-style:italic}
.block p{margin:0;color:var(--ink-soft)}

.constraint{
  margin-top:20px;padding:14px 18px;
  background:rgba(200,32,42,.08);border-left:2px solid var(--red);
  font-size:14.5px;color:var(--ink-soft);
}
.constraint strong{color:var(--red);font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;font-weight:500;display:block;margin-bottom:4px}

.outcome{
  margin-top:24px;padding:20px 24px;
  background:var(--bg-3);border:1px solid var(--line-soft);
  display:flex;gap:16px;align-items:flex-start;
}
.outcome .icon{width:20px;height:20px;flex:none;margin-top:2px;color:var(--red-glow)}
.outcome .text{color:var(--ink-soft);font-size:15px}
.outcome .text strong{color:var(--ink);display:block;font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;font-weight:500;margin-bottom:4px}

/* chord fingering figure inside week */
.fig{
  margin:24px 0 8px;
  padding:24px;
  background:var(--bg);border:1px solid var(--line-soft);
}
.fig .cap{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-mute);margin-bottom:18px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
}
.fig .cap strong{color:var(--red);font-weight:500}

.fig .shapes{
  display:flex;gap:36px;justify-content:center;align-items:flex-end;flex-wrap:wrap;
}
.fig .shape{text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px}
.fig .shape svg{height:150px;width:auto}
.fig .shape .name{
  font-family:var(--display);font-size:22px;font-weight:700;
  color:var(--red);letter-spacing:.02em;
}
.fig .shape .annotation{
  text-align:left;max-width:280px;font-size:14px;color:var(--ink-soft);line-height:1.5;
}
.fig .shape .annotation .muted{color:var(--ink-mute);font-style:italic;font-size:13px;margin-top:6px}

.fig .shape.text{align-items:flex-start;align-self:center;max-width:300px;text-align:left}
.fig .shape.text p{margin:0 0 8px;font-size:14.5px;color:var(--ink-soft);line-height:1.5}
.fig .shape.text p.muted{color:var(--ink-mute);font-style:italic;font-size:13px}

/* rhythm strip figure */
.rhythm-fig{
  margin:24px 0 8px;
  padding:24px;
  background:var(--bg);border:1px solid var(--line-soft);
}
.rhythm-fig .cap{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-mute);margin-bottom:14px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
}
.rhythm-fig .cap strong{color:var(--red);font-weight:500}
.rhythm-fig svg{width:100%;max-height:90px;height:auto}

/* end state */
.end-state{
  margin-top:32px;padding:36px 32px;
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
  border:1px solid var(--line-soft);
  position:relative;
}
.end-state::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
  opacity:.6;
}
.end-state h4{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--red);margin:0 0 16px;font-weight:500;
}
.end-state p.head{
  font-family:var(--serif);font-size:26px;line-height:1.3;margin:0 0 20px;color:var(--ink);font-weight:400;font-style:italic;
}
.end-state ul{margin:0;padding-left:0;list-style:none;color:var(--ink-soft);columns:2;column-gap:32px}
@media (max-width:720px){ .end-state ul{columns:1} }
.end-state ul li{
  padding: 8px 0 8px 28px;position:relative;border-bottom:1px solid var(--line-soft);
  break-inside:avoid;
}
.end-state ul li::before{
  content:"";position:absolute;left:0;top:15px;
  width:14px;height:1px;background:var(--red);
}

.next-level{
  margin-top:48px;
  padding:32px;
  border:1px solid var(--line-soft);
  background:var(--bg-2);
  display:flex;flex-direction:column;gap:12px;
}
.next-level .label{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-mute)}
.next-level h3{font-family:var(--serif);font-size:28px;font-weight:400;margin:0;color:var(--ink)}
.next-level h3 em{color:var(--red-glow);font-style:italic}
.next-level p{margin:0;color:var(--ink-soft);max-width:60ch}

/* ---------- footer ---------- */
.acdc-method-page .course-footer{
  padding:56px 0 48px;text-align:center;border-top:1px solid var(--line-soft);
  color:var(--ink-mute);font-size:14px;
}
.acdc-method-page .course-footer .bolt-icon{display:inline-block;width:18px;height:24px;margin-bottom:14px;color:var(--red);opacity:.8}
.acdc-method-page .course-footer p{margin:6px 0;max-width:520px;margin-left:auto;margin-right:auto}
.acdc-method-page .course-footer a{color:var(--red-glow)}

/* reveal */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .8s ease, transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* small helper */
.muted{color:var(--ink-mute)}
.red{color:var(--red-glow)}


.acdc-method-page .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.acdc-method-page .download-link,
.acdc-method-page .secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid rgba(232,74,82,.45);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.acdc-method-page .download-link {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.acdc-method-page .secondary-link {
  color: var(--red-glow);
}