/* RIFF ROULETTE / THE GUITAR PLAYBOOK
   Scoped, self-contained stylesheet for static /learn/ pages.
   Design: graphite / acid lime / safety orange, matching RR marketing art.
   No scripts, build pipeline or frameworks required. */
:root {
  color-scheme:dark;
  --bg:#0b100d;
  --bg-lift:#111913;
  --surface:#172119;
  --surface-2:#1e2b1f;
  --border:#2b3d2a;
  --border-soft:#223022;
  --text:#f4f6ec;
  --muted:#c2cdc1;
  --dim:#8da18d;
  --lime:#c9ff38;
  --orange:#ff7048;
  --max:1220px;
  --body:'Barlow',Inter,'Segoe UI',Arial,sans-serif;
  --display:'Barlow Condensed','Arial Narrow',Impact,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{margin:0;min-width:320px; background:var(--bg);color:var(--text);font-family:var(--body);-webkit-font-smoothing:antialiased}
body::selection{background:var(--lime);color:#11190d}
a{color:inherit;text-decoration:none}
a:hover{color:var(--lime)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--lime);outline-offset:5px}
img{max-width:100%;height:auto}
button,input,summary{font:inherit}
.shell{width:min(calc(100% - 44px),var(--max));margin-inline:auto}
.skip-link{position:absolute;top:-60px;left:20px;background:var(--lime);color:#0d140d;padding:12px 20px;font-weight:800;z-index:999}
.skip-link:focus{top:12px}
.site-header{position:relative;z-index:50;background:#080d0a;border-bottom:1px solid #1d2a1f}
.site-header-inner{display:flex;align-items:center;justify-content:space-between;min-height:88px;gap:24px}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand:hover{color:var(--text)}
.brand-mark{position:relative;display:flex;align-items:center;justify-content:center;min-width:44px;width:44px;height:44px;border:1px solid #334825;border-radius:10px;background:#0f1c10;color:var(--lime);font-family:var(--display);font-size:30px;font-weight:900;font-style:italic;line-height:1;letter-spacing:-.07em;text-shadow:0 0 9px #c9ff3844;box-shadow:0 0 22px #9cde2420}
.brand-mark-stroke{position:absolute;width:30px;height:2px;background:var(--lime);transform:rotate(-13deg);bottom:8px;left:7px;box-shadow:0 2px 0 #c9ff3838}
.brand-words{display:flex;flex-direction:column;line-height:.78}
.brand-words strong{font-family:var(--display);font-size:25px;font-weight:700;letter-spacing:.02em}
.brand-words em{font-style:normal;color:var(--lime)}
.brand-words small{font-size:7px;margin-top:9px;letter-spacing:.18em;font-weight:900;color:#e2ebde}
.desktop-nav{display:flex;align-items:center;gap:34px}
.desktop-nav>a:not(.top-cta){font-size:13px;font-weight:800;color:#ced4c9}
.desktop-nav .is-active{color:var(--lime)!important}
.top-cta,.button-primary{display:inline-flex;align-items:center;justify-content:space-between;gap:30px;background:var(--lime);color:#0b1209!important;border-radius:4px;padding:17px 19px;font-size:12px;font-weight:900;letter-spacing:.02em;transition:transform .16s ease,background-color .16s ease,box-shadow .16s ease}
.top-cta:hover,.button-primary:hover{background:#dbff7b;transform:translateY(-2px);box-shadow:0 8px 25px #c9ff3826}
.top-cta span,.button-primary span{font-size:20px;font-weight:400}
.mobile-nav{display:none;position:relative}
.mobile-nav summary{list-style:none;display:flex;justify-content:space-between;gap:13px;align-items:center;padding:12px 14px;border:1px solid var(--border);font-size:11px;font-weight:900;letter-spacing:.1em;cursor:pointer}
.mobile-nav summary::-webkit-details-marker{display:none}
.mobile-nav nav{position:absolute;right:0;top:100%;min-width:210px;padding:8px;background:#111a12;border:1px solid var(--border);box-shadow:0 20px 45px #000b;display:grid}
.mobile-nav nav a{padding:13px 12px;font-weight:700;border-bottom:1px solid var(--border-soft)}
.mobile-nav nav a:last-child{border:0;color:var(--lime)}
/* Breadcrumb + recurring editorial language */
.breadcrumbs{display:flex;gap:11px;flex-wrap:wrap;align-items:center;color:#b2c3b0;font-size:10px;letter-spacing:.14em;font-weight:900;margin-bottom:48px}
.breadcrumbs span[aria-hidden]{color:var(--orange);font-weight:900}
.breadcrumbs a:hover{text-decoration:underline;text-underline-offset:5px}
.eyebrow{display:flex;align-items:center;gap:14px;color:#e8f1e4;font-size:11px;font-weight:900;letter-spacing:.13em;text-transform:uppercase}
.eyebrow-counter{border:1px solid #8b9e81;border-radius:40px;min-width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;padding:0 9px;color:var(--text);letter-spacing:0}
.neon-dot{display:inline-block;width:10px;height:10px;flex:0 0 auto;border-radius:50%;background:var(--lime);box-shadow:0 0 0 6px #c9ff3817,0 0 22px #c9ff385c;vertical-align:middle;margin-right:7px}
.dot{color:var(--lime)}
/* Learn hub */
.index-hero{background:radial-gradient(ellipse at 75% 39%,#20372166 0,transparent 47%),linear-gradient(180deg,#131d15 0,#0b100d 95%);padding:52px 0 48px;border-bottom:1px solid #263824}
.index-hero .breadcrumbs{margin-bottom:62px}
.index-hero h1,.article-hero h1{margin:27px 0 22px;font-family:var(--display);font-size:clamp(58px,8.7vw,124px);line-height:.87;letter-spacing:-.016em;font-weight:800;text-transform:uppercase;max-width:1100px}
.index-hero h1 em{color:var(--lime);font-style:normal}
.index-hero> .shell >p{font-size:clamp(18px,2.3vw,23px);line-height:1.52;color:var(--muted);max-width:780px;margin:29px 0 56px}
.index-hero-bottom{border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;gap:14px;padding-top:24px;font-size:11px;font-weight:900;letter-spacing:.1em}
.index-hero-bottom a{color:var(--lime)}
.ticker{background:var(--lime);color:#101609;overflow:hidden;border-bottom:5px solid #141a11}
.ticker>div{white-space:nowrap;width:max-content;margin:auto;padding:5px 16px 8px;font-family:var(--display);font-size:clamp(38px,5.4vw,66px);font-weight:600;line-height:1;letter-spacing:.025em}
.ticker b{font-family:var(--body);font-weight:500;margin:0 clamp(13px,2.1vw,35px);color:var(--orange)}
.index-guides{padding-top:100px;padding-bottom:58px}
.section-intro{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:36px}
.section-intro h2{font-family:var(--display);font-size:clamp(49px,6.4vw,85px);font-weight:800;line-height:.9;margin:18px 0 0;letter-spacing:-.01em}
.section-intro>p{color:var(--muted);max-width:360px;margin:0;line-height:1.7;font-size:15px}
.guides-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.guide-card{min-width:0;background:linear-gradient(141deg,#182319 0,#101711 72%);border:1px solid #2d4228;min-height:270px;transition:transform .18s ease,border-color .18s ease,background-color .18s ease}
.guide-card:hover{transform:translateY(-3px);border-color:#adf331}
.guide-card-link{display:flex;flex-direction:column;align-items:stretch;height:100%;padding:26px;gap:12px}
.guide-card-link:hover{color:inherit}
.guide-card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;font-weight:900;letter-spacing:.13em;text-transform:uppercase}
.guide-num{color:var(--lime)}
.guide-category{color:var(--muted)}
.guide-card h2{font-family:var(--display);font-size:clamp(32px,3vw,47px);line-height:.97;font-weight:800;text-transform:uppercase;max-width:480px;margin:12px 0 0}
.guide-card p{font-size:15px;line-height:1.6;color:var(--muted);margin:0;max-width:520px}
.guide-card-foot{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:11px;font-weight:900;letter-spacing:.05em;margin-top:auto;padding-top:21px;border-top:1px solid var(--border-soft)}
.guide-card-foot>span{color:var(--dim)}
.guide-card-foot strong{color:var(--lime)}
.learn-outro{padding-top:45px;padding-bottom:90px}
.outro-line{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:20px 0;font-size:11px;font-weight:900;letter-spacing:.12em;color:var(--dim)}
.learn-outro p{margin:20px 0;color:var(--muted);font-size:16px}
.learn-outro a{text-decoration:underline;text-decoration-color:var(--lime);text-underline-offset:5px}
/* Article masthead */
.article-hero{background:radial-gradient(ellipse at 85% 56%,#22402571 0,transparent 37%),linear-gradient(180deg,#141f15,#0e150f);border-bottom:1px solid var(--border-soft);padding:44px 0 62px;overflow:hidden}
.article-hero .breadcrumbs{margin-bottom:50px}
.article-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:60px;align-items:center}
.article-hero h1{font-size:clamp(50px,6.9vw,91px);max-width:920px;line-height:.92;margin:25px 0 24px}
.hero-deck{font-size:clamp(17px,2vw,22px);line-height:1.45;color:var(--muted);max-width:820px;margin:0 0 22px}
.article-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-top:28px}
.article-meta span{border:1px solid #314631;color:#bcd0b8;text-transform:uppercase;font-size:10px;letter-spacing:.08em;font-weight:800;padding:9px 11px;border-radius:2px}
.article-meta span:first-child{color:var(--lime)}
.hero-type{display:grid;justify-items:center;gap:21px}
.hero-disc{width:min(230px,22vw);height:min(230px,22vw);min-width:145px;min-height:145px;border:1px dashed #9bd83980;border-radius:50%;display:grid;place-items:center;box-shadow:0 0 0 25px #c9ff3807,inset 0 0 0 20px #c9ff380b,0 0 70px #c9ff3809;transform:rotate(-12deg)}
.hero-disc span{border-radius:50%;width:49%;height:49%;display:grid;place-items:center;font-family:var(--display);font-style:italic;font-weight:900;font-size:clamp(52px,6vw,85px);letter-spacing:-.11em;background:var(--lime);color:#132014;box-shadow:0 0 34px #c9ff3845}
.hero-label{font-size:10px;line-height:1.55;letter-spacing:.16em;font-weight:900;text-align:center;color:#bad2ad}
/* Editorial content */
.article-layout{display:grid;grid-template-columns:minmax(0,800px) minmax(240px,295px);gap:clamp(32px,6.5vw,92px);align-items:start;padding-top:55px;padding-bottom:95px}
.lesson-content{min-width:0;font-size:17px;line-height:1.78;color:#c6d2c4}
.lesson-content>p:first-of-type{font-size:21px;color:#eff4e9;line-height:1.65;margin-top:0}
.lesson-content p{margin:0 0 23px}
.lesson-content > h2{font-family:var(--display);font-size:clamp(32px,4vw,48px);line-height:1.02;text-transform:uppercase;font-weight:800;letter-spacing:0;color:var(--text);margin:54px 0 18px;scroll-margin-top:30px}
.lesson-content h3{font-family:var(--display);font-size:29px;line-height:1.1;text-transform:uppercase;color:var(--text);font-weight:700;margin:35px 0 14px}
.lesson-content strong{color:#f4f8ed;font-weight:800}
.lesson-content ul,.lesson-content ol{margin:0 0 27px;padding-left:27px}
.lesson-content li{margin:7px 0;padding-left:4px}
.lesson-content li::marker{color:var(--lime);font-weight:900}
.lesson-content code{border:1px solid #2f472b;background:#192319;color:var(--lime);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;padding:2px 6px;font-size:.9em;border-radius:3px}
.lesson-content .inline-link{text-decoration:underline;text-decoration-color:#9ff03b;text-decoration-thickness:1px;text-underline-offset:4px;color:#e0f9a3}
.lesson-content .inline-link:hover{color:var(--lime)}
.table-scroller{max-width:100%;overflow-x:auto;margin:18px 0 28px;border:1px solid var(--border);background:#121b13}
.lesson-table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.5;min-width:425px}
.lesson-table th{background:#1e2f1c;color:var(--lime);font-size:12px;text-align:left;font-weight:800;text-transform:uppercase;letter-spacing:.045em;padding:15px 16px;border-bottom:1px solid var(--border)}
.lesson-table td{padding:14px 16px;border-top:1px solid #253526;color:#dbe4d4}
.lesson-table tr:nth-child(even) td{background:#172017}
/* Chord illustrations */
.chord-gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:25px 0 33px}
.chord-diagram{background:#111b13;margin:0;padding:11px 8px;border:1px solid var(--border);text-align:center;min-width:0}
.chord-diagram img{display:block;max-width:100%;width:100%;height:auto;margin:auto}
.chord-diagram figcaption{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:9px 6px 4px;font-size:12px;line-height:1.35}
.chord-diagram figcaption span{color:var(--lime);font-family:monospace;font-size:11px}
/* Article aside & related guides */
.article-sidebar{min-width:0}
.sticky-side{position:sticky;top:20px}
.side-panel{border:1px solid var(--border);background:linear-gradient(155deg,#172418,#111912);padding:23px 22px;margin-bottom:16px}
.side-kicker{font-size:10px;line-height:1.5;font-weight:900;color:var(--lime);letter-spacing:.12em}
.side-panel ol{margin:16px 0 0;padding:0 0 0 20px;font-size:13px;line-height:1.5;color:#becbb9}
.side-panel li{margin-bottom:14px;padding-left:2px}
.side-panel li::marker{color:var(--lime);font-size:11px}
.side-panel a:hover{text-decoration:underline;text-underline-offset:3px}
.side-panel-cta{background:#1a2b1b;border-color:#426336}
.side-panel-cta h2{margin:18px 0 11px;font-family:var(--display);font-size:39px;line-height:.93;font-weight:800}
.side-panel-cta p{font-size:14px;color:#d1deca;line-height:1.65;margin:0 0 20px}
.side-panel-cta a{font-size:11px;font-weight:900;color:#161b0f;background:var(--lime);display:flex;justify-content:space-between;align-items:center;padding:14px 12px;gap:10px}
.story-cta{margin:60px 0 0;padding:29px 27px 25px;border:1px solid #436a2c;background:linear-gradient(120deg,#223322 0,#141f17 70%);position:relative;overflow:hidden}
.story-cta::after{content:'✳';position:absolute;right:-4px;top:22px;font-size:95px;line-height:1;color:var(--orange);opacity:.32;pointer-events:none}
.cta-kicker{font-size:10px;color:#e3eecf;letter-spacing:.13em;font-weight:900;display:flex;align-items:center;gap:7px;position:relative;z-index:1}
.story-cta-inner{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-top:20px;position:relative;z-index:1}
.story-cta h2{font-family:var(--display);font-weight:800;text-transform:uppercase;line-height:.97;font-size:clamp(33px,4vw,49px);margin:0 0 14px;color:var(--text)}
.story-cta h2 span{color:var(--lime)}
.story-cta p{font-size:14px;line-height:1.6;margin:0;color:#cfdbcb;max-width:420px}
.story-cta .button{flex-shrink:0;max-width:240px;padding:15px 12px}
.story-cta>small{font-size:10px;color:#b1c0ae;letter-spacing:.03em;display:block;margin-top:18px}
.next-guides{border-top:1px solid var(--border);padding-top:70px;padding-bottom:100px}
.all-guides{color:var(--lime);font-weight:900;font-size:11px;letter-spacing:.06em;padding-bottom:10px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.related-card{padding:25px 22px;min-height:220px;border:1px solid var(--border);background:#121b14;display:flex;flex-direction:column;gap:16px;transition:border-color .16s}
.related-card:hover{color:var(--text);border-color:var(--lime)}
.card-tag{color:var(--lime);font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.12em}
.related-card strong{font-family:var(--display);font-size:30px;line-height:1.02;text-transform:uppercase;font-weight:800}
.read-link{margin-top:auto;border-top:1px solid var(--border-soft);padding-top:16px;font-size:10px;font-weight:900;color:var(--dim)}
.read-link span{color:var(--lime)}
.article-pagination{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:34px}
.article-pagination a{border-top:1px solid var(--border);padding-top:17px;display:grid;gap:8px}
.article-pagination a:nth-child(2){text-align:right}
.article-pagination a span{font-size:10px;color:var(--lime);font-weight:900;letter-spacing:.11em}
.article-pagination a strong{font-size:14px;line-height:1.4;color:var(--muted)}
/* Sitewide footer */
.site-footer{background:#080d0a;border-top:1px solid #334528;padding:40px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}
.footer-brand{display:flex;align-items:center;gap:10px}
.footer-mark{display:grid;place-items:center;width:40px;height:40px;border:1px solid #58812d;border-radius:8px;color:var(--lime);font-family:var(--display);font-weight:900;font-style:italic;font-size:25px}
.footer-brand>div{display:grid;gap:3px}
.footer-brand strong{font-family:var(--display);font-size:25px;line-height:1}
.footer-brand strong span{color:var(--lime)}
.footer-brand small{font-size:7px;letter-spacing:.18em;font-weight:800}
.footer-inner nav{display:flex;flex-wrap:wrap;gap:20px;font-size:12px;font-weight:800;color:#c6cec1}
.footer-inner>p{flex-basis:100%;font-size:11px;color:#839180;margin:10px 0 0}
@media(max-width:1050px){
  .article-layout{grid-template-columns:minmax(0,1fr) 240px;gap:35px}
  .article-hero-grid{grid-template-columns:minmax(0,1fr) 170px;gap:20px}
  .chord-gallery{grid-template-columns:repeat(3,minmax(0,1fr))}
  .story-cta-inner{flex-direction:column;align-items:start}
}
@media(max-width:810px){
  .desktop-nav{display:none}.mobile-nav{display:block}
  .site-header-inner{min-height:74px}
  .article-layout{grid-template-columns:minmax(0,1fr)}
  .article-sidebar{display:none}
  .article-hero-grid{grid-template-columns:minmax(0,1fr)}
  .hero-type{display:none}
  .article-hero{padding-bottom:48px}
  .breadcrumbs{margin-bottom:32px!important}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .guide-card h2{font-size:37px}
  .index-guides{padding-top:72px}
}
@media(max-width:640px){
  .shell{width:min(calc(100% - 34px),var(--max))}
  .index-hero{padding:28px 0 35px}
  .index-hero h1{font-size:clamp(53px,12.6vw,79px);margin-top:22px}
  .index-hero>.shell>p{font-size:17px;margin:25px 0 38px}
  .index-hero-bottom{align-items:flex-start;flex-direction:column;gap:14px}
  .ticker>div{font-size:43px;padding-top:8px}
  .article-hero{padding:28px 0 35px}
  .article-hero h1{font-size:clamp(48px,11.5vw,74px)}
  .hero-deck{font-size:17px}
  .article-meta span{font-size:9px}
  .guides-grid{grid-template-columns:1fr}
  .guide-card{min-height:248px}
  .section-intro{display:block}
  .section-intro>p{margin-top:20px}
  .article-layout{padding-top:38px;padding-bottom:70px}
  .lesson-content{font-size:16px;line-height:1.77}
  .lesson-content>p:first-of-type{font-size:18px}
  .chord-gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
  .chord-diagram{padding:7px 4px}
  .chord-diagram figcaption{flex-direction:column;gap:2px}
  .related-grid{grid-template-columns:1fr}
  .related-card{min-height:165px}
  .next-guides{padding-top:45px;padding-bottom:70px}
  .all-guides{display:block;margin-top:20px}
  .story-cta{padding:22px 18px;margin-top:42px}
  .story-cta-inner{align-items:stretch}
  .story-cta .button{max-width:none}
  .outro-line{flex-direction:column;align-items:flex-start}
  .footer-inner{flex-direction:column;align-items:flex-start}
  .article-pagination a strong{font-size:12px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}