:root{
  --bg:#0f1419;
  --bg-alt:#161c22;
  --panel:#1a222b;
  --panel-2:#222c37;
  --ink:#e7ecf1;
  --ink-dim:#a8b4c0;
  --ink-mute:#6b7a87;
  --accent:#e8a547;
  --accent-2:#f2c078;
  --accent-dark:#b9782a;
  --line:#2b3642;
  --line-2:#34414f;
  --radius:10px;
  --shadow:0 6px 20px rgba(0,0,0,.35);
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.55;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(232,165,71,.08), transparent 60%),
    radial-gradient(900px 500px at 100% 10%, rgba(242,192,120,.05), transparent 60%),
    var(--bg);
  min-height:100vh;
}

a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:40;
  background:rgba(15,20,25,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:16px;height:60px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:600;letter-spacing:.2px}
.brand:hover{text-decoration:none}
.brand-mark{border-radius:4px}
.brand-name{font-size:17px}

.site-nav{display:flex;gap:18px;margin-left:auto;font-size:14px}
.site-nav a{color:var(--ink-dim);padding:6px 2px}
.site-nav a:hover{color:var(--ink);text-decoration:none}
.nav-out{color:var(--accent-2)}

.nav-toggle{display:none;background:none;border:0;padding:6px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px}

/* Layout */
.layout{padding:32px 24px 80px}
.workspace{margin-bottom:48px}
.workspace-head{margin-bottom:24px}
.workspace-head h1{font-size:32px;margin:0 0 8px;letter-spacing:-.3px}
.lede{font-size:17px;color:var(--ink-dim);max-width:720px;margin:0 0 8px}
.meta-line{font-size:12px;color:var(--ink-mute);margin:0}

.workspace-grid{
  display:grid;
  grid-template-columns:340px 1fr;
  gap:20px;
  margin-bottom:20px;
}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--shadow);
}
.panel h2{font-size:16px;margin:0 0 14px;color:var(--accent-2);letter-spacing:.3px;text-transform:uppercase}
.panel h3{font-size:14px;margin:18px 0 8px;color:var(--ink)}

.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--ink-dim);margin-bottom:4px}
.field-inline{display:flex;align-items:center;justify-content:space-between;gap:12px}
.field-inline label{margin:0}

input[type=number],select{
  width:100%;
  background:var(--bg-alt);
  color:var(--ink);
  border:1px solid var(--line-2);
  border-radius:6px;
  padding:9px 10px;
  font-size:14px;
  font-family:inherit;
}
input[type=number]:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent-dark)}
.input-pair{display:flex;gap:8px}
.input-pair input{flex:1}
.input-pair select{width:80px;flex-shrink:0}

.hint{font-size:12px;color:var(--ink-mute);margin:4px 0 0}

.presets{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.presets-label{font-size:12px;color:var(--ink-mute);flex-basis:100%;margin-bottom:2px}
.chip{
  background:var(--panel-2);
  color:var(--ink);
  border:1px solid var(--line-2);
  border-radius:999px;
  padding:5px 11px;
  font-size:12px;
  cursor:pointer;
  transition:background .15s,border-color .15s;
}
.chip:hover{background:var(--line-2);border-color:var(--accent-dark)}

.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.btn{
  background:var(--panel-2);
  color:var(--ink);
  border:1px solid var(--line-2);
  border-radius:6px;
  padding:9px 14px;
  font-size:14px;
  cursor:pointer;
  font-family:inherit;
  transition:background .15s,border-color .15s;
}
.btn:hover{background:var(--line-2)}
.btn-primary{background:var(--accent);color:#1a1208;border-color:var(--accent-dark);font-weight:600}
.btn-primary:hover{background:var(--accent-2)}

.hidden{display:none!important}

/* Results */
.empty{color:var(--ink-mute);font-size:14px;padding:16px 0}
.empty-sub{font-size:12px}
.summary{font-size:13px;color:var(--ink-dim);margin-bottom:10px}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
th{color:var(--ink-dim);font-weight:500;font-size:12px;text-transform:uppercase;letter-spacing:.4px}
td{font-family:var(--mono)}
tr:last-child td{border-bottom:0}

/* Diagram */
.diagram-panel{margin-top:20px}
.diagram-wrap{background:var(--bg-alt);border:1px solid var(--line);border-radius:8px;padding:10px}
#fretDiagram{width:100%;height:100px;display:block}

/* Reference & Mistakes */
.reference,.mistakes,.print{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  margin-bottom:24px;
  box-shadow:var(--shadow);
}
.reference h2,.mistakes h2,.print h2{font-size:22px;margin:0 0 12px;color:var(--accent-2)}
.reference p,.mistakes p,.print p{color:var(--ink-dim);max-width:78ch}
.formula{
  background:var(--bg-alt);
  border:1px solid var(--line-2);
  border-radius:6px;
  padding:12px 14px;
  font-family:var(--mono);
  font-size:14px;
  color:var(--accent-2);
  margin:12px 0;
  overflow-x:auto;
}
.mistake-list{padding-left:18px;margin:0}
.mistake-list li{margin-bottom:10px;color:var(--ink-dim)}
.mistake-list strong{color:var(--ink)}

/* Print */
.print-controls{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.print-area{
  background:#fff;
  color:#111;
  border-radius:6px;
  padding:14px;
  margin-top:10px;
}
.print-header{display:flex;justify-content:space-between;font-size:13px;margin-bottom:8px}
#printStrip{width:100%;height:60px;display:block}
.print-footer{font-size:11px;color:#555;margin-top:6px}
.print-note{font-size:13px;color:var(--ink-mute);margin-top:12px}

/* Footer */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--bg-alt);
  padding:28px 0;
  margin-top:40px;
}
.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer-note{font-size:13px;color:var(--ink-mute);margin:4px 0 0}
.footer-nav{display:flex;gap:14px;flex-wrap:wrap;font-size:13px}
.footer-nav a{color:var(--ink-dim)}
.footer-nav a:hover{color:var(--ink)}

/* Responsive */
@media (max-width: 900px){
  .workspace-grid{grid-template-columns:1fr}
  .site-nav{display:none}
  .nav-toggle{display:block;margin-left:auto}
  .site-nav.open{
    display:flex;flex-direction:column;position:absolute;
    top:60px;left:0;right:0;background:var(--bg);
    padding:16px 24px;border-bottom:1px solid var(--line);
  }
  .workspace-head h1{font-size:26px}
}
@media (max-width: 520px){
  .wrap{padding:0 16px}
  .layout{padding:20px 16px 60px}
  .panel{padding:16px}
  .field-inline{flex-direction:column;align-items:flex-start}
}

@media print{
  body{background:#fff;color:#000}
  .site-header,.site-footer,.panel-inputs,.print-controls,.diagram-panel,.reference,.mistakes{display:none!important}
  .print{border:0;box-shadow:none;padding:0}
  .print-area{border:1px solid #000}
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}