/* =========================
   Flying Circus Field Guide
   Layout + Typography System
   ========================= */

/* 1) CSS Reset (light) */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

/* 2) Design Tokens */
:root {
  /* Color */
  --bg: #fbf7ef;          /* warm off-white */
  --ink: #1f1e1b;         /* charcoal */
  --muted: rgba(31,30,27,.72);
  --faint: rgba(31,30,27,.12);
  --card: rgba(255,255,255,.35);

  /* Type */
  --serif: "Libre Baskerville", Georgia, "Times New Roman", serif;
  --display: "Cormorant Garamond", "Garamond", serif;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;

  /* Sizing */
  --max: 78ch;            /* main reading measure */
  --pad: clamp(18px, 3.2vw, 42px);
  --gap: clamp(14px, 2.2vw, 24px);

  /* Rhythm */
  --rule: 1px solid var(--faint);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.06);
}

/* 3) Base */
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: calc(var(--max) + (var(--pad) * 2));
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section {
  padding: clamp(28px, 5vw, 64px) 0;
  border-top: var(--rule);
}

.section:first-of-type { border-top: none; }

/* 4) Headings */
h1, h2, h3 {
  font-family: var(--display);
  margin: 0 0 10px 0;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(42px, 5vw, 66px);
  font-weight: 600;
  line-height: 1.05;
}

h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  line-height: 1.15;
  margin-top: 6px;
}

h3 {
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 600;
  line-height: 1.2;
}

.lede {
  font-size: 1.05em;
  color: var(--muted);
  margin: 12px 0 0 0;
  font-style: italic;
}

.rule { border-top: var(--rule); margin: 18px 0 0 0; }

/* 5) Small UI text */
.meta, .caption, .label {
  font-family: var(--sans);
  font-size: 0.86em;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.caption { margin-top: 10px; }
.label { text-transform: uppercase; font-size: 0.78em; }

/* 6) Pull quote */
.pull {
  margin: 18px 0;
  padding: 16px 18px;
  border: var(--rule);
  border-radius: var(--radius);
  background: rgba(255,255,255,.28);
  box-shadow: 0 8px 22px rgba(0,0,0,.04);
}

.pull p {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
}

/* 7) Figure / full-width visual */
.figure {
  border: var(--rule);
  border-radius: var(--radius);
  background: rgba(255,255,255,.25);
  overflow: hidden;
  box-shadow: var(--shadow);
}

/* 8) Tempo ladder */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 18px 0;
}

.btn {
  font-family: var(--sans);
  font-size: 0.88em;
  border: var(--rule);
  background: rgba(255,255,255,.25);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.btn:hover { background: rgba(255,255,255,.40); }

.tempo-card {
  border: var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 10px 28px rgba(0,0,0,.05);
  overflow: hidden;
  margin-bottom: 14px;
}

.tempo-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  padding: 16px 16px 14px 16px;
  align-items: start;
  cursor: pointer;
}

.tempo-title {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 1.05em;
  margin: 0;
}

.tempo-bpm {
  font-family: var(--sans);
  font-size: 0.86em;
  color: var(--muted);
  text-align: right;
  margin-top: 3px;
}

.tempo-one {
  grid-column: 1 / -1;
  margin: 4px 0 0 0;
  color: var(--muted);
}

.tempo-body {
  border-top: var(--rule);
  padding: 14px 16px 16px 16px;
  display: none; /* toggled via JS */
}

.kv {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 6px 12px;
  margin-bottom: 10px;
}

.kv .k { font-family: var(--sans); color: var(--muted); font-size: 0.86em; }
.kv .v { color: var(--ink); }

.listen {
  margin-top: 10px;
  font-family: var(--sans);
  font-size: 0.92em;
}

.score {
  margin-top: 12px;
  border-radius: 12px;
  overflow: hidden;
  border: var(--rule);
}

/* 9) Flavor & Force two-column */
.two-col {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: var(--gap);
  align-items: start;
}

.panel {
  border: var(--rule);
  border-radius: var(--radius);
  background: rgba(255,255,255,.25);
  padding: 14px 16px;
  box-shadow: 0 10px 22px rgba(0,0,0,.04);
}

/* 10) Responsive */
@media (max-width: 920px) {
  .two-col { grid-template-columns: 1fr; }
  .kv { grid-template-columns: 1fr; }
}