/* FretPilot Pro — Mono Signal theme
   Brutalist black & white, one electric-lime accent on the live element only. */

:root {
  --bg:        #0C0C0C;
  --surface:   #161616;
  --hairline:  #262626;
  --text:      #FAFAFA;
  --text-dim:  #8A8A8A;
  --accent:    #C6FF00; /* electric lime — active note + live timer, nothing else */
  --accent-dim: rgba(198, 255, 0, 0.12);

  --maxw: 760px;
  --maxw-wide: 1080px;
  --radius: 14px;

  --sans: "Helvetica Neue", "Inter", "Arial", system-ui, -apple-system, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, "Menlo", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Layout shells ---------- */
.wrap   { width: 100%; max-width: var(--maxw);  margin: 0 auto; padding: 0 24px; }
.wrap-w { width: 100%; max-width: var(--maxw-wide); margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(12, 12, 12, 0.82);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--hairline);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 800; letter-spacing: -0.03em; font-size: 18px;
}
.brand:hover { text-decoration: none; }
.brand .dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px 1px rgba(198, 255, 0, 0.55);
}
.brand .pro { color: var(--text-dim); font-weight: 600; }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a {
  color: var(--text-dim); font-size: 14px; font-weight: 600;
  letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 64px; text-align: center; }
.eyebrow {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--text-dim); margin: 0 0 22px;
}
.hero h1 {
  font-size: clamp(40px, 8vw, 76px);
  line-height: 0.98; letter-spacing: -0.04em; font-weight: 850;
  margin: 0 0 8px;
}
.hero h1 .lime { color: var(--accent); }
.hero p.sub {
  max-width: 560px; margin: 24px auto 0;
  color: var(--text-dim); font-size: 19px;
}

/* live-timer motif */
.timer {
  display: inline-flex; align-items: baseline; gap: 14px;
  margin: 40px auto 6px;
  font-family: var(--mono); font-variant-numeric: tabular-nums;
}
.timer .big {
  font-size: clamp(56px, 13vw, 104px); line-height: 1;
  color: var(--accent); font-weight: 700; letter-spacing: -0.04em;
  text-shadow: 0 0 36px rgba(198, 255, 0, 0.30);
}
.timer .unit { font-size: 28px; color: var(--text-dim); }
.timer-meta {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 13px; letter-spacing: 0.12em; color: var(--text-dim);
  text-transform: uppercase;
}
.listening {
  display: inline-flex; align-items: center; gap: 9px;
  margin-top: 18px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-dim);
}
.listening .pulse {
  width: 9px; height: 9px; border-radius: 50%; background: var(--accent);
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50%      { opacity: 1;    transform: scale(1.15); box-shadow: 0 0 12px 2px rgba(198,255,0,0.6); }
}

/* ---------- Fretboard motif ---------- */
.board { margin: 56px auto 0; max-width: 720px; }
.board figcaption {
  margin-top: 14px; text-align: center;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-dim);
}

/* ---------- Steps ---------- */
.steps {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin: 80px 0 16px;
}
.step {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 26px 24px;
}
.step .num {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em;
  color: var(--accent); font-weight: 700;
}
.step h3 { margin: 12px 0 6px; font-size: 18px; letter-spacing: -0.02em; }
.step p  { margin: 0; color: var(--text-dim); font-size: 15px; }

/* ---------- Section heading ---------- */
.section { padding: 64px 0; }
.section-title {
  font-size: clamp(26px, 4vw, 34px); letter-spacing: -0.03em; font-weight: 800;
  margin: 0 0 8px;
}
.section-lead { color: var(--text-dim); margin: 0 0 0; }

/* ---------- Legal / document pages ---------- */
.doc { padding: 56px 0 96px; }
.doc h1 {
  font-size: clamp(34px, 6vw, 52px); letter-spacing: -0.04em; font-weight: 850;
  margin: 0 0 10px;
}
.doc .meta {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.06em;
  color: var(--text-dim); margin: 0 0 8px;
}
.doc .lede {
  font-size: 19px; color: var(--text); margin: 26px 0 8px;
  padding-bottom: 28px; border-bottom: 1px solid var(--hairline);
}
.doc h2 {
  font-size: 22px; letter-spacing: -0.02em; margin: 44px 0 12px;
  scroll-margin-top: 84px;
}
.doc h2 .idx { color: var(--accent); font-family: var(--mono); font-size: 15px; margin-right: 10px; }
.doc h3 { font-size: 17px; margin: 24px 0 8px; }
.doc p, .doc li { color: #D6D6D6; }
.doc strong { color: var(--text); }
.doc ul { padding-left: 22px; }
.doc li { margin: 8px 0; }

.callout {
  background: var(--surface); border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent);
  border-radius: 12px; padding: 18px 22px; margin: 24px 0;
}
.callout p { margin: 0; color: var(--text); }

.toc {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 20px 24px; margin: 28px 0 8px;
}
.toc p {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--text-dim); margin: 0 0 12px;
}
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 32px; }
.toc li { margin: 6px 0; }
.toc a { color: #D6D6D6; }
.toc a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 40px 0; margin-top: 40px; color: var(--text-dim);
}
.foot-grid {
  display: flex; flex-wrap: wrap; gap: 18px 28px;
  align-items: center; justify-content: space-between;
}
.foot-links { display: flex; gap: 22px; flex-wrap: wrap; }
.foot-links a { color: var(--text-dim); font-size: 14px; font-weight: 600; }
.foot-links a:hover { color: var(--text); text-decoration: none; }
.foot-copy { font-size: 13px; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; }
  .steps { grid-template-columns: 1fr; }
  .toc ol { columns: 1; }
  .hero { padding: 56px 0 40px; }
}

@media (prefers-reduced-motion: reduce) {
  .listening .pulse { animation: none; }
}