/* =========================================================
   Gelvin Guitars — site.css
   PALETTE: "Tube Glow"
   Alternate palettes are at the bottom of this file — paste
   one over the token block to switch the entire site.
   ========================================================= */

:root{
  /* page + card surfaces: LIGHT cool neutral (no earth tones) */
  --paper:#F3F5F9;
  --panel:#FFFFFF;
  --panel-2:#EDF1F6;
  --panel-3:#E2E8F0;
  --panel-4:#CED7E3;

  /* UI chip / control surface: LIGHT so dark text on it stays visible */
  --chassis:#EEF2F7;

  /* ink: near-black on light */
  --bone:#0B1220; --bone-dim:#374253; --bone-faint:#454F5E;
  --ink:#FFFFFF;            /* text on vivid accent fills */

  /* accents: vivid, high-contrast, NOT earthy */
  --amber:#1466E6;         /* PRIMARY: buttons, markers, dots */
  --amber-hi:#4C8DF5;
  --accent:#0E52CC;        /* links + accent TEXT (AA on light) */
  --patina:#0EA5B8;        /* secondary: vivid cyan */
  --patina-dim:#0B7E8C;
  --ember:#E11D48;         /* pop: vivid rose */
  --oxblood:#BE123C;
  --nickel:#64748B;        /* slate metal */

  /* instrument diagram: dark slate board + light strings (reads clearly) */
  --string:#D6DCE3; --nut:#EEF2F6; --fretboard:#1E2632;

  --lift:0 16px 40px -18px rgba(15,23,42,.22);
  --line:rgba(15,23,42,.16); --line-2:rgba(15,23,42,.08);

  --display:"Big Shoulders Display",Impact,"Arial Narrow",sans-serif;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  /* real monospace, required anywhere columns must line up (tab, code) */
  --code:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1200px; --gutter:24px; --radius:8px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1 !important;transform:none !important}
}
html,body{margin:0;padding:0}
body{
  background:var(--paper);color:var(--bone);
  font-family:var(--body);font-size:18px;line-height:1.66;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  background-image:
    radial-gradient(900px 520px at 78% -6%,  rgba(20,102,230,.06), transparent 62%),
    radial-gradient(760px 500px at 8% 22%,   rgba(14,165,184,.05), transparent 60%),
    radial-gradient(1100px 700px at 50% 108%,rgba(225,29,72,.03), transparent 65%),
    repeating-linear-gradient(135deg, rgba(15,23,42,.02) 0 2px, transparent 2px 5px);
  background-attachment:fixed;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none;transition:color .15s}
a:hover{color:var(--oxblood);text-decoration:underline}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
::selection{background:var(--amber);color:var(--ink)}
.skip{position:absolute;left:-9999px;top:0;background:var(--amber);color:var(--ink);padding:10px 16px;
  font-family:var(--mono);font-size:12px;z-index:200}
.skip:focus{left:8px;top:8px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.narrow{max-width:780px}
.mono{font-family:var(--mono)}
.hide{display:none !important}
@media(max-width:780px){.hide-sm{display:none !important}}
@media(min-width:781px){.hide-lg{display:none !important}}

/* ---------------- typography ---------------- */
h1,h2,h3,h4{font-family:var(--display);font-weight:800;text-transform:uppercase;margin:0 0 14px;line-height:.94}
h1{font-size:clamp(44px,7vw,84px);line-height:.9;letter-spacing:.005em;
  color:var(--bone);
  filter:drop-shadow(0 3px 16px rgba(180,86,10,.12))}
h2{font-size:clamp(25px,3.2vw,38px);font-weight:700;letter-spacing:.03em}
h3{font-size:20px;font-weight:700;letter-spacing:.06em;margin-bottom:10px}
h4{font-size:15px;font-weight:700;letter-spacing:.1em;margin-bottom:8px}
p{margin:0 0 18px}
.eyebrow{font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent);margin:0 0 10px}
.lede{font-size:20px;color:var(--bone-dim);max-width:64ch;margin:0}
.dim{color:var(--bone-dim)}
.faint{color:var(--bone-faint)}
.tag{font-family:var(--mono);font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--bone-faint)}
blockquote{border-left:3px solid var(--accent);padding-left:22px;margin:28px 0;font-style:italic;font-size:21px;line-height:1.5}
hr{border:0;border-top:1px solid var(--line);margin:40px 0}
code{font-family:var(--mono);font-size:.9em;background:var(--panel-3);padding:2px 6px;border-radius:3px;color:var(--accent)}
kbd{font-family:var(--mono);font-size:12.5px;background:var(--panel-3);border:1px solid var(--line);border-radius:3px;padding:2px 6px}

/* ---------------- header / nav ---------------- */
.topbar{position:sticky;top:0;z-index:80;border-bottom:1px solid var(--line);
  background:rgba(246,248,251,.9);backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:0 1px 0 rgba(180,86,10,.06), 0 10px 30px -20px rgba(38,26,14,.35)}
.topbar .wrap{display:flex;align-items:center;gap:20px;min-height:64px}
.brand{display:flex;align-items:baseline;gap:9px;font-family:var(--display);font-weight:800;
  font-size:26px;letter-spacing:.05em;text-transform:uppercase;color:var(--bone);white-space:nowrap}
.brand:hover{text-decoration:none;color:var(--bone)}
.brand em{font-style:normal;color:var(--accent)}
.brand small{font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--bone-faint);font-weight:600;text-transform:uppercase}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav > a,.navitem > button{background:transparent;border:0;cursor:pointer;
  font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.02em;text-transform:uppercase;
  color:var(--bone-dim);padding:11px 13px;border-radius:3px;white-space:nowrap;transition:.16s}
.nav > a:hover,.navitem > button:hover{color:var(--bone);background:rgba(20,102,230,.10);text-decoration:none}
.nav > a.here,.navitem.here > button{color:var(--accent)}
.navitem{position:relative}
.navitem > button:after{content:"\25BE";margin-left:6px;opacity:.6;font-size:9px}
.dropdown{position:absolute;top:100%;right:0;min-width:246px;
  max-height:calc(100vh - 96px);overflow-y:auto;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);padding:6px;display:none;
  box-shadow:0 24px 54px rgba(38,26,14,.20), 0 0 0 1px rgba(180,86,10,.05)}
.navitem[data-open="1"] .dropdown{display:block}
.dropdown a{display:block;padding:9px 12px;border-radius:3px;color:var(--bone-dim);
  font-family:var(--mono);font-size:13.5px;letter-spacing:.06em;transition:.14s}
.dropdown a:hover{background:var(--panel-3);color:var(--accent);text-decoration:none;transform:translateX(2px)}
.dropdown a b{display:block;font-family:var(--display);font-size:15px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--bone);font-weight:700;margin-bottom:1px}
.dropdown a:hover b{color:var(--accent)}
.dropdown-head{display:block;padding:10px 12px 4px;font-family:var(--mono);font-size:10px;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;color:var(--bone-faint)}
.dropdown-head:first-child{padding-top:2px}
.burger{display:none;margin-left:auto;background:transparent;border:1px solid var(--line);
  color:var(--bone);border-radius:3px;padding:9px 12px;font-family:var(--mono);font-size:12px;cursor:pointer}
@media(max-width:1000px){
  .burger{display:block}
  .nav{position:fixed;inset:64px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--panel);border-bottom:1px solid var(--line);padding:10px var(--gutter) 22px;
    max-height:calc(100vh - 64px);overflow:auto;display:none}
  .nav[data-open="1"]{display:flex}
  .nav > a,.navitem > button{width:100%;text-align:left;padding:14px 4px;font-size:13px;
    border-bottom:1px solid var(--line-2)}
  .navitem{width:100%}
  .dropdown{position:static;display:block;border:0;box-shadow:none;padding:0 0 8px 14px;background:transparent}
  .dropdown a{padding:8px 4px}
  .navitem > button:after{float:right}
}

/* ---------------- fretwire divider (signature) ---------------- */
.fretwire{height:16px;position:relative}
.fretwire:before{content:"";position:absolute;left:0;right:0;top:6px;height:2px;
  background:linear-gradient(90deg,transparent,var(--nickel) 8%,#334155 50%,var(--nickel) 92%,transparent);
  opacity:.7;box-shadow:0 0 10px rgba(108,117,128,.22)}
.fretwire:after{content:"";position:absolute;left:50%;top:2px;width:10px;height:10px;margin-left:-5px;
  border-radius:50%;background:var(--accent);opacity:.95;box-shadow:0 0 12px 2px rgba(180,86,10,.3)}

/* ---------------- surfaces ---------------- */
.panel{position:relative;
  background:linear-gradient(180deg,var(--panel-2) 0%,var(--panel) 100%);
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--lift)}
.panel:before{content:"";position:absolute;inset:0 0 auto 0;height:1px;
  border-radius:var(--radius) var(--radius) 0 0;
  background:linear-gradient(90deg,transparent,rgba(36,26,16,.05),transparent);pointer-events:none}
.pad{padding:24px}
.pad-lg{padding:32px}
section{margin-top:66px}
section.tight{margin-top:40px}
/* .wrap sets margin:0 auto for horizontal centering, which — because a class
   selector always beats a type selector — was silently canceling the
   margin-top above on every <section class="wrap">. That collapsed the
   vertical spacing between stacked sections across the whole site. These
   two rules restore it without touching any markup. */
section.wrap{margin-top:66px}
section.wrap.tight{margin-top:40px}
.sechead{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.sechead h2{margin:0}
.sechead .more{margin-left:auto;font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase}

/* ---------------- buttons ---------------- */
.btn{display:inline-block;background:var(--panel-2);border:1px solid var(--line);color:var(--bone-dim);
  font-family:var(--mono);font-size:12.5px;letter-spacing:.13em;text-transform:uppercase;
  padding:12px 20px;border-radius:3px;cursor:pointer;
  transition:border-color .16s,color .16s,background .16s,box-shadow .18s,transform .16s}
.btn:hover{border-color:var(--accent);color:var(--accent);text-decoration:none;
  background:rgba(238,147,16,.10);box-shadow:0 8px 22px -12px rgba(38,26,14,.28);transform:translateY(-1px)}
.btn-solid{background:linear-gradient(160deg,var(--amber) 0%,var(--accent) 100%);
  border-color:transparent;color:var(--ink);font-weight:700;
  box-shadow:0 10px 26px -12px rgba(14,82,204,.6)}
.btn-solid:hover{background:linear-gradient(160deg,var(--amber-hi) 0%,var(--amber) 100%);
  color:var(--ink);box-shadow:0 16px 40px -12px rgba(14,82,204,.75);transform:translateY(-2px)}
.btn-lg{padding:16px 28px;font-size:12.5px}
.btn[aria-pressed="true"]{background:rgba(238,147,16,.16);color:var(--accent);border-color:rgba(180,86,10,.45)}

/* ---------------- forms ---------------- */
label{display:block;font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.12em;
  text-transform:uppercase;color:var(--bone-faint);margin-bottom:8px}
input[type=text],input[type=email],input[type=number],input[type=url],input[type=password],select,textarea{
  width:100%;background:#FFFFFF;color:var(--bone);border:1px solid var(--line);
  border-radius:3px;padding:12px 13px;font-family:var(--mono);font-size:13.5px;line-height:1.5;
  transition:border-color .15s,box-shadow .15s}
textarea{font-family:var(--body);font-size:16px;min-height:170px;resize:vertical}
input:hover,select:hover,textarea:hover{border-color:rgba(20,102,230,.45)}
input:focus,select:focus,textarea:focus{border-color:var(--accent);outline:none;
  box-shadow:0 0 0 3px rgba(20,102,230,.15)}
select{appearance:none;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--amber) 50%),linear-gradient(135deg,var(--amber) 50%,transparent 50%);
  background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat}
option,optgroup{background:var(--panel)}
optgroup{color:var(--accent);font-style:normal}
.field{margin-bottom:22px}
.formrow{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:640px){.formrow{grid-template-columns:1fr}}
.formnote{font-family:var(--mono);font-size:12.5px;color:var(--bone-faint);margin-top:8px;line-height:1.7}
input[type=range]{width:100%;appearance:none;height:24px;background:transparent;cursor:pointer;padding:0;border:0}
input[type=range]::-webkit-slider-runnable-track{height:4px;background:var(--panel-3);border-radius:2px}
input[type=range]::-moz-range-track{height:4px;background:var(--panel-3);border-radius:2px}
input[type=range]::-webkit-slider-thumb{appearance:none;width:16px;height:16px;border-radius:50%;
  background:var(--amber);margin-top:-6px;
  box-shadow:0 0 0 3px rgba(20,102,230,.22), 0 0 16px rgba(20,102,230,.75)}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border:0;border-radius:50%;background:var(--amber);
  box-shadow:0 0 16px rgba(20,102,230,.75)}
.seg{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden;background:var(--panel-3)}
.seg button{flex:1;background:transparent;border:0;color:var(--bone-dim);font-family:var(--mono);
  font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;padding:10px 4px;cursor:pointer;transition:.15s}
.seg button:hover{color:var(--bone);background:rgba(238,147,16,.12)}
.seg button[aria-pressed="true"]{background:var(--amber);color:var(--ink);font-weight:600;
  box-shadow:0 2px 8px -2px rgba(180,86,10,.35)}

/* ---------------- cards & grids ---------------- */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:980px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:660px){.g2,.g3,.g4{grid-template-columns:1fr}}

.card{position:relative;display:block;
  background:linear-gradient(180deg,var(--panel-2) 0%,var(--panel) 100%);
  border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--lift);transition:border-color .2s,transform .2s,box-shadow .2s;color:inherit;overflow:hidden}
.card:before{content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,246,233,.22),transparent);pointer-events:none;z-index:2}
.card:after{content:"";position:absolute;inset:0;opacity:0;pointer-events:none;transition:opacity .25s;
  background:radial-gradient(420px 200px at 12% 0%,rgba(20,102,230,.10),transparent 70%)}
a.card:hover{border-color:rgba(20,102,230,.5);text-decoration:none;transform:translateY(-3px);
  box-shadow:var(--lift), 0 16px 44px -18px rgba(20,102,230,.55)}
a.card:hover:after{opacity:1}
.card h3{margin-bottom:8px;transition:color .18s;position:relative;z-index:1}
a.card:hover h3{color:var(--accent)}
.card p{margin:0;font-size:15.5px;color:var(--bone-dim);position:relative;z-index:1}
.card .kicker{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);display:block;margin-bottom:12px;position:relative;z-index:1}
.card .glyph{width:34px;height:34px;margin-bottom:14px;color:var(--accent)}
.num{font-family:var(--mono);font-size:12.5px;color:var(--accent);letter-spacing:.2em;display:block;margin-bottom:10px;
  position:relative;z-index:1}

/* ---------------- scroll reveal ---------------- */
.reveal{opacity:0;transform:translateY(14px);
  transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------------- ad slots ----------------
   Deliberately the quietest thing on the page. */
.ad{display:flex;align-items:center;justify-content:center;overflow:hidden;
  background:rgba(255,246,233,.02);border:1px dashed rgba(255,246,233,.09);border-radius:var(--radius)}
.ad-wrap{margin:44px 0;text-align:center}
.ad-wrap > .lbl{display:block;font-family:var(--mono);font-size:9px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--bone-faint);opacity:.5;margin-bottom:7px}
.ad-leader{min-height:100px}
@media(min-width:781px){.ad-leader{min-height:110px}}
.ad-rect{min-height:260px;max-width:340px;margin-inline:auto}
.ad-tower{min-height:610px;width:300px}
.ad-inline{min-height:110px}
.railwrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:38px;align-items:start}
@media(max-width:1080px){.railwrap{grid-template-columns:minmax(0,1fr)}.railwrap .rail{display:none}}
.rail-sticky{position:sticky;top:96px}
.ad-ph{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--bone-faint);opacity:.38}

/* ---------------- article body ---------------- */
.prose{max-width:74ch}
.prose h2{margin-top:44px}
.prose h3{margin-top:32px;color:var(--amber-hi)}
.prose ul,.prose ol{padding-left:22px;margin:0 0 20px}
.prose li{margin-bottom:9px;color:var(--bone-dim)}
.prose li::marker{color:var(--accent)}
.prose p{color:var(--bone-dim)}
.prose strong{color:var(--bone);font-weight:500}
.callout{border-left:2px solid var(--patina);
  background:linear-gradient(90deg,rgba(53,214,176,.10),rgba(53,214,176,.02));
  padding:18px 22px;border-radius:0 3px 3px 0;margin:26px 0;
  box-shadow:-1px 0 26px -8px rgba(53,214,176,.5)}
.callout p:last-child{margin-bottom:0}
.callout.warn{border-color:var(--ember);
  background:linear-gradient(90deg,rgba(225,29,72,.11),rgba(225,29,72,.02));
  box-shadow:-1px 0 26px -8px rgba(225,29,72,.5)}
table{width:100%;border-collapse:collapse;margin:0 0 24px;font-family:var(--mono);font-size:13px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line-2)}
th{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);
  border-bottom:1px solid var(--line)}
td{color:var(--bone-dim);transition:color .12s,background .12s}
tr:hover td{color:var(--bone);background:rgba(20,102,230,.05)}

/* ---------------- breadcrumbs ---------------- */
.crumbs{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--bone-faint);padding:18px 0 0}
.crumbs a{color:var(--bone-faint)}
.crumbs a:hover{color:var(--accent)}
.crumbs span{margin:0 8px;opacity:.5}

/* ---------------- newsletter ---------------- */
.signup{display:grid;grid-template-columns:1fr auto;gap:10px;max-width:520px}
@media(max-width:520px){.signup{grid-template-columns:1fr}}

/* ---------------- footer ---------------- */
.sitefoot{border-top:1px solid var(--line);margin-top:80px;padding:52px 0 44px;
  background:linear-gradient(180deg,rgba(0,0,0,.30),rgba(225,29,72,.035));
  box-shadow:inset 0 1px 0 rgba(20,102,230,.10)}
.footgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr 1fr 1fr;gap:24px}
@media(max-width:1300px){.footgrid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
@media(max-width:900px){.footgrid{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:620px){.footgrid{grid-template-columns:1fr 1fr}}
@media(max-width:420px){.footgrid{grid-template-columns:1fr}}
.footgrid h4{color:var(--accent);letter-spacing:.14em;font-size:13px}
.footgrid a{display:block;font-family:var(--mono);font-size:12px;color:var(--bone-dim);
  padding:5px 0;letter-spacing:.04em;transition:.14s}
.footgrid a:hover{color:var(--accent);text-decoration:none;transform:translateX(3px)}
.footgrid p{font-size:15px;color:var(--bone-dim);max-width:38ch}
.footbase{margin-top:40px;padding-top:24px;border-top:1px solid var(--line-2);
  display:flex;flex-wrap:wrap;gap:14px;align-items:center;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;color:var(--bone-faint)}
.footbase .spacer{margin-left:auto}
.footbase a{color:var(--bone-faint)}
.footbase a:hover{color:var(--accent)}

/* =========================================================
   ALTERNATE PALETTES
   Replace the token values at the top of :root with one of
   these. Nothing else changes — the tool diagrams read the
   same variables, so they recolour automatically.

   ---- "SUNBURST" — warmer, cherry-to-gold, vintage finish ----
   --chassis:#100906; --panel:#1E1109; --panel-2:#2B1A0F;
   --panel-3:#3F2818; --panel-4:#55391F;
   --bone:#FFF2DC; --bone-dim:#D3BC9A; --bone-faint:#9A8462; --ink:#170D06;
   --amber:#FFB627; --amber-hi:#FFD166; --patina:#8FBF5A;
   --patina-dim:#5F8C38; --ember:#E23E2C; --oxblood:#A32117; --nickel:#CFC4B0;
   --string:#E3D9C6; --nut:#F8F0DC; --fretboard:#301C10;

   ---- "WORKSHOP" — cooler, higher contrast, more modern ----
   --chassis:#08090C; --panel:#12151C; --panel-2:#1B2029;
   --panel-3:#272E3A; --panel-4:#374252;
   --bone:#F4F7FB; --bone-dim:#AFBACA; --bone-faint:#748196; --ink:#0A0C10;
   --amber:#FFB020; --amber-hi:#FFCB63; --patina:#22D3EE;
   --patina-dim:#0E9FB8; --ember:#FB7185; --oxblood:#E11D48; --nickel:#C9D4E0;
   --string:#DDE5EE; --nut:#F2F6FA; --fretboard:#161B24;
   ========================================================= */

/* =========================================================
   VIDEO — facade embed
   Shows a thumbnail and a play button. The real YouTube
   player (and all ~1.3MB of it) only loads on click, so a
   page with six videos costs six thumbnails, not 8MB.
   ========================================================= */
.ytlite{position:relative;display:block;width:100%;aspect-ratio:16/9;
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;cursor:pointer;box-shadow:var(--lift);
  transition:border-color .2s,box-shadow .2s,transform .2s}
.ytlite:hover{border-color:rgba(20,102,230,.55);
  box-shadow:var(--lift),0 18px 50px -18px rgba(20,102,230,.5);transform:translateY(-2px)}
.ytlite img.thumb{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transition:transform .4s cubic-bezier(.2,.7,.3,1),filter .3s;filter:saturate(.85) brightness(.82)}
.ytlite:hover img.thumb{transform:scale(1.03);filter:saturate(1) brightness(.92)}
.ytlite:after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(13,10,9,.10) 0%,transparent 34%,rgba(13,10,9,.72) 100%)}
.ytlite .playbtn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:76px;height:76px;border-radius:50%;border:0;cursor:pointer;z-index:3;
  background:linear-gradient(160deg,var(--amber-hi),var(--amber) 55%,var(--ember));
  box-shadow:0 0 0 6px rgba(20,102,230,.16),0 14px 40px -8px rgba(20,102,230,.7);
  display:grid;place-items:center;transition:transform .2s,box-shadow .2s}
.ytlite:hover .playbtn{transform:translate(-50%,-50%) scale(1.09);
  box-shadow:0 0 0 10px rgba(20,102,230,.20),0 18px 52px -8px rgba(20,102,230,.85)}
.ytlite .playbtn svg{width:26px;height:26px;fill:var(--ink);margin-left:4px}
.ytlite .meta{position:absolute;left:0;right:0;bottom:0;z-index:3;padding:18px 20px;
  display:flex;align-items:flex-end;gap:14px;pointer-events:none}
.ytlite .meta h3{margin:0;font-size:19px;letter-spacing:.04em;color:var(--bone);
  text-shadow:0 2px 14px rgba(0,0,0,.9)}
.ytlite .dur{margin-left:auto;font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;
  background:rgba(13,10,9,.82);border:1px solid var(--line);color:var(--bone-dim);
  padding:4px 9px;border-radius:3px;white-space:nowrap}
.ytlite iframe{position:absolute;inset:0;width:100%;height:100%;border:0;z-index:5}
.ytlite.playing{cursor:default;transform:none}
.ytlite.playing:hover{transform:none}
.ytlite .lbl-noscript{position:absolute;inset:auto 0 0 0;z-index:4;text-align:center;
  font-family:var(--mono);font-size:12.5px;padding:8px;color:var(--bone-dim)}

/* video + notes layout */
.videopage{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:38px;align-items:start}
@media(max-width:1080px){.videopage{grid-template-columns:1fr}.videopage .rail{display:none}}

/* chapter list under a video */
.chapters{list-style:none;margin:18px 0 0;padding:0;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.chapters li{border-bottom:1px solid var(--line-2)}
.chapters li:last-child{border-bottom:0}
.chapters button{width:100%;display:flex;align-items:baseline;gap:14px;text-align:left;
  background:transparent;border:0;color:var(--bone-dim);padding:12px 16px;cursor:pointer;
  font-family:var(--body);font-size:15.5px;transition:.14s}
.chapters button:hover{background:rgba(20,102,230,.07);color:var(--bone)}
.chapters .t{font-family:var(--mono);font-size:12.5px;color:var(--accent);
  min-width:52px;letter-spacing:.06em}

/* video library grid */
.vidgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:20px}
.vidcard .ytlite{border-radius:var(--radius) var(--radius) 0 0;box-shadow:none;border-bottom:0}
.vidcard{background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--lift)}
.vidcard .body{padding:18px 20px 20px}
.vidcard h3{margin-bottom:6px;font-size:18px}
.vidcard p{margin:0;font-size:14.5px;color:var(--bone-dim)}
.vidcard .row{display:flex;gap:12px;align-items:center;margin-top:14px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--bone-faint)}
.vidcard .row a{margin-left:auto}

/* =========================================================
   YOUTUBE CHANNEL CTA
   The subscribe button keeps YouTube red on purpose. It is
   the one place an off-palette colour earns its keep — people
   pattern-match that red instantly and don't have to read it.
   ========================================================= */
:root{ --yt-red:#FF0033; }

.ytcta{position:relative;display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;
  background:linear-gradient(135deg,var(--panel-2),var(--panel) 60%,rgba(255,0,51,.07));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;
  box-shadow:var(--lift);overflow:hidden}
.ytcta:before{content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,246,233,.22),transparent)}
.ytcta .avatar{width:60px;height:60px;border-radius:50%;flex:none;overflow:hidden;
  border:2px solid rgba(255,0,51,.5);box-shadow:0 0 26px -4px rgba(255,0,51,.5);background:var(--panel-3)}
.ytcta .avatar img{width:100%;height:100%;object-fit:cover}
.ytcta .txt h3{margin:0 0 4px;font-size:19px;letter-spacing:.05em}
.ytcta .txt p{margin:0;font-size:14.5px;color:var(--bone-dim)}
.ytcta .txt .stats{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--bone-faint);margin-top:7px;display:block}
.ytcta .acts{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
@media(max-width:760px){
  .ytcta{grid-template-columns:auto 1fr;gap:16px}
  .ytcta .acts{grid-column:1/-1;justify-content:stretch}
  .ytcta .acts > *{flex:1;text-align:center}
}
.btn-sub{display:inline-flex;align-items:center;gap:9px;background:var(--yt-red);border:1px solid var(--yt-red);
  color:#fff;font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.13em;
  text-transform:uppercase;padding:12px 20px;border-radius:3px;cursor:pointer;white-space:nowrap;
  box-shadow:0 10px 30px -10px rgba(255,0,51,.7);transition:.16s}
.btn-sub:hover{background:#FF2D55;border-color:#FF2D55;color:#fff;text-decoration:none;
  transform:translateY(-2px);box-shadow:0 14px 38px -10px rgba(255,0,51,.9)}
.btn-sub svg{width:17px;height:12px;fill:currentColor;flex:none}

/* compact version for the sidebar rail */
.ytcta-mini{display:block;text-align:center;padding:20px 18px;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--lift)}
.ytcta-mini .avatar{width:54px;height:54px;margin:0 auto 12px}
.ytcta-mini h4{margin:0 0 6px;font-size:14px;letter-spacing:.1em;color:var(--bone)}
.ytcta-mini p{font-size:13.5px;color:var(--bone-dim);margin:0 0 16px}
.ytcta-mini .btn-sub{width:100%;justify-content:center}

/* the small "watch on YouTube" line that sits under a player */
.ytout{display:flex;align-items:center;gap:8px;margin-top:12px;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--bone-faint)}
.ytout a{color:var(--bone-dim);display:inline-flex;align-items:center;gap:7px}
.ytout a:hover{color:var(--yt-red);text-decoration:none}
.ytout svg{width:15px;height:11px;fill:currentColor}
.ytout .sep{opacity:.4}

.donate-strip{display:flex;gap:24px;align-items:center;justify-content:space-between;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:10px;padding:22px 0}
.donate-strip .donate-text{max-width:620px}
.donate-strip strong{font-family:var(--display);font-weight:800;font-size:19px;color:var(--accent);text-transform:uppercase;letter-spacing:.02em;display:block;margin-bottom:6px}
.donate-strip p{margin:0;color:var(--bone-dim);font-size:14px;line-height:1.55}
.donate-btn{white-space:nowrap;flex-shrink:0}

/* ---- shop listing ---- */
.listing{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;align-items:center;
  background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:20px}
@media(max-width:760px){.listing{grid-template-columns:1fr;gap:18px}}
.listing-photo img{display:block;width:100%;height:auto;border-radius:8px;border:1px solid var(--line);background:#fff}
.listing-body h3{font-family:var(--display);font-weight:800;font-size:24px;margin:6px 0 10px;color:var(--bone)}
.listing-body p{color:var(--bone-dim);line-height:1.6;margin:0 0 14px}
.listing-price{font-family:var(--display) !important;font-weight:800;font-size:20px;
  color:var(--accent) !important;margin:0 0 16px !important}

/* ---- small screen header fit (prevents horizontal overflow) ---- */
@media(max-width:560px){
  .topbar .wrap{gap:10px}
  .brand{font-size:20px;min-width:0;overflow:hidden;text-overflow:ellipsis}
  .brand small{font-size:9px;letter-spacing:.12em}
  .burger{padding:8px 10px;font-size:11px;flex:0 0 auto}
}
@media(max-width:400px){
  .brand{font-size:18px}
  .brand small{display:none}
}
/* ---- minimum tap target size on touch devices (WCAG 2.5.8) ---- */
@media(max-width:1000px){
  .kf-qbtn{min-height:26px}
  .ci-cell{min-width:26px;min-height:26px}
}

/* ---- hero grid collapses on small screens ---- */
@media(max-width:860px){
  .herogrid{grid-template-columns:1fr !important;gap:26px !important}
}
/* ---- key finder picker: fewer columns on small screens ---- */
@media(max-width:760px){ .kf-picker{grid-template-columns:repeat(4,1fr)} }
@media(max-width:460px){ .kf-picker{grid-template-columns:repeat(3,1fr)} }

/* ---- wide data tables scroll instead of breaking layout on phones ---- */
@media(max-width:700px){
  .chordtable,.initab,.settab,.fbtab,.sctab,.putab,.twtab,.rmtab,.soltab,.mtab,.pt-review{
    display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
}

/* ---- page meta (reading time) ---- */
.pagemeta{display:flex;align-items:center;gap:10px;margin-top:14px;font-family:var(--mono);
  font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--bone-faint)}
.pagemeta .dot{opacity:.5}

/* ---- prev / next pager ---- */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:30px}
@media(max-width:640px){.pager{grid-template-columns:1fr}}
.pager-link{display:block;background:var(--panel-2);border:1px solid var(--line);border-radius:8px;
  padding:16px 18px;text-decoration:none;transition:.15s}
.pager-link:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-1px)}
.pager-link span{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.07em;
  text-transform:uppercase;color:var(--bone-faint);margin-bottom:5px}
.pager-link b{display:block;font-family:var(--display);font-weight:800;font-size:17px;
  color:var(--bone);line-height:1.25}
.pager-link:hover b{color:var(--accent)}
.pager-next{text-align:right}
.pager-up{grid-column:1 / -1;text-align:center}

/* ---- 404 helper grid ---- */
.fourofour{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:760px){.fourofour{grid-template-columns:1fr}}
.fourlist{list-style:none;margin:0;padding:0}
.fourlist li{padding:9px 0;border-top:1px solid var(--line-2)}
.fourlist li:first-child{border-top:0}
.fourlist a{font-family:var(--display);font-weight:700;font-size:16px;color:var(--bone);display:block}
.fourlist a:hover{color:var(--accent)}
.fourlist span{display:block;font-size:13px;color:var(--bone-faint);margin-top:2px}

/* ---- video embed must not exceed its column on phones ---- */
.ytlite{box-sizing:border-box;max-width:100%}
.videopage,.videopage > div{min-width:0}

/* ---- any wide table in article content scrolls rather than breaking layout ---- */
@media(max-width:760px){
  .prose table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;white-space:nowrap}
}

/* ---- theory diagrams ---- */
.dia svg{max-width:100%;height:auto}
@media(max-width:640px){ .dia{padding:14px 8px 10px} .dia figcaption{font-size:13px} }

/* ---- wide two column dropdown for long tool lists ---- */
.dropdown-wide{display:none;grid-template-columns:1fr 1fr;gap:0 10px;min-width:560px;padding:8px;
  max-height:calc(100vh - 96px);overflow-y:auto;align-content:start}
.dropdown-wide a{padding:7px 12px}
.dropdown-wide a b{margin-bottom:0}
.dropdown-wide .dropdown-head{padding:8px 12px 3px}
.navitem[data-open="1"] .dropdown-wide{display:grid}
.dropdown-wide .dgroup{min-width:0}
.dropdown-wide .dropdown-all{grid-column:1 / -1;margin-top:6px;padding-top:10px;
  border-top:1px solid var(--line);text-align:center}
@media(max-width:1100px){
  .dropdown-wide{min-width:0;grid-template-columns:1fr}
  .navitem[data-open="1"] .dropdown-wide{display:block}
}

/* ---- monospace for tablature and code ---- */
code,pre,kbd,samp{font-family:var(--code)}
.tabbox pre{font-family:var(--code) !important;white-space:pre;overflow-x:auto}


/* FOURTH PASS: performance and interface polish */
/* Keep fixed decorative backgrounds off touch devices, where fixed painting is costly. */
@media (hover:none), (max-width:780px){
  body{background-attachment:scroll}
}

/* Consistent, usable control targets and unambiguous disabled states. */
button,.btn,input[type="button"],input[type="submit"],input[type="reset"],select{
  min-height:44px;
}
button:disabled,.btn[aria-disabled="true"],input:disabled,select:disabled,textarea:disabled{
  opacity:.55;cursor:not-allowed;filter:saturate(.55)
}
button[aria-busy="true"],.btn[aria-busy="true"]{cursor:progress}
input,select,textarea,button{font:inherit}
input::placeholder,textarea::placeholder{color:var(--bone-faint);opacity:1}

/* Prevent long URLs, generated values, and labels from creating mobile overflow. */
.prose,.panel,.card,.callout,.warn,.field,.result-guidance{overflow-wrap:anywhere}
pre,table,.scroll-x{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}

/* Skip rendering work for large sections until they approach the viewport. */
@supports (content-visibility:auto){
  main > section:nth-of-type(n+3){content-visibility:auto;contain-intrinsic-size:auto 700px}
}

/* Stronger focus treatment for high-contrast users. */
@media (prefers-contrast:more){
  :root{--line:rgba(15,23,42,.38);--line-2:rgba(15,23,42,.22)}
  :focus-visible{outline-width:3px;outline-color:#003fa8}
  .panel,.card,.callout,.warn,input,select,textarea,button{border-color:rgba(15,23,42,.42)}
}

/* Lower-data mode removes purely decorative painting and reveal motion. */
@media (prefers-reduced-data:reduce){
  body{background-image:none}
  .reveal{opacity:1!important;transform:none!important;transition:none!important}
}

/* Clean print output for guides and calculated results. */
@media print{
  .topbar,.sitefoot,.donate-strip,.ad-wrap,.ad,.no-print,.burger,.ytcta{display:none!important}
  body{background:#fff!important;color:#000!important;font-size:11pt;line-height:1.45}
  main,.wrap,.narrow{max-width:none!important;width:auto!important;padding:0!important;margin:0!important}
  section{margin-top:24px;content-visibility:visible!important}
  .panel,.card,.callout,.warn{box-shadow:none!important;background:#fff!important;border:1px solid #999!important;break-inside:avoid}
  a{color:#000!important;text-decoration:underline}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:9pt;overflow-wrap:anywhere}
  h1,h2,h3,h4{color:#000!important;filter:none!important;break-after:avoid}
}


/* SIXTH PASS: guided paths, breadcrumbs, and editorial context */
.breadcrumbs{margin-top:18px;margin-bottom:-18px;font-size:13px;color:var(--bone-faint)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:7px;list-style:none;margin:0;padding:0}
.breadcrumbs li{display:flex;align-items:center;gap:7px}
.breadcrumbs li:not(:last-child)::after{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--bone-dim)}
.breadcrumbs a:hover{color:var(--accent)}
.review-line{font-size:13px;color:var(--bone-faint);margin-top:12px}
.path-steps{counter-reset:pathstep;display:grid;gap:14px}
.path-step{position:relative;padding:22px 22px 22px 76px}
.path-step::before{counter-increment:pathstep;content:counter(pathstep);position:absolute;left:22px;top:20px;width:36px;height:36px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:800;color:var(--accent)}
.path-step h2{margin-top:0}
.path-note{border-left:3px solid var(--accent);padding-left:18px}
@media(max-width:640px){.path-step{padding-left:64px}.path-step::before{left:14px}}


/* ---------------- featured build archive ---------------- */
.feature-split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(300px,.95fr);gap:34px;align-items:center}
.feature-split.reverse{grid-template-columns:minmax(300px,.95fr) minmax(0,1.05fr)}
.feature-media{margin:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel);box-shadow:var(--lift)}
.feature-media img{width:100%;height:auto;display:block}
.feature-media figcaption,.build-gallery figcaption{font-size:13px;line-height:1.5;color:var(--bone-faint);padding:10px 13px;background:var(--panel-2);border-top:1px solid var(--line-2)}
.feature-copy .lede{margin-bottom:22px}
.build-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:28px 0}
.build-gallery figure{margin:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel);box-shadow:var(--lift)}
.build-gallery img{width:100%;height:100%;max-height:620px;object-fit:cover}
.build-gallery .wide{grid-column:1 / -1}
.build-gallery .wide img{max-height:none;object-fit:contain;background:#050505}
.build-story{max-width:920px}
.build-story h2{margin-top:48px}
.build-facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:26px 0}
.build-fact{padding:16px 18px;background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius)}
.build-fact b{display:block;font-family:var(--display);font-size:17px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px}
.build-fact span{font-size:14px;color:var(--bone-dim)}
@media(max-width:820px){.feature-split,.feature-split.reverse{grid-template-columns:1fr}.feature-split.reverse .feature-media{order:-1}.build-gallery{grid-template-columns:1fr}.build-gallery .wide{grid-column:auto}.build-facts{grid-template-columns:1fr}}