/* ─────────────────────────────────────────────────────────────────────────
   Reverbs — Interactive Media Engineering
   reverb.css : full-bleed, Ableton-minimal layout layered over micro.css tokens.

   Loads AFTER ../../micro/micro.css (which supplies all design tokens, the
   light/dark themes, the appearance palettes, and the font presets). This file
   adds ONLY the new Reverbs full-bleed components — no boxed cards, no chrome.
   ───────────────────────────────────────────────────────────────────────── */

:root { --rv-rail-w: 168px; }

html, body { background: var(--bg); }
/* clip the off-canvas mobile nav drawer (ambient.js) so it can't widen the page */
html:has(body.reverb), body.reverb { overflow-x: hidden; max-width: 100%; }
body.reverb {
  margin: 0;
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

/* ── chapter rail (vertical, Ableton-style) ── */
.rv-rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rv-rail-w);
  padding: 92px 0 32px 28px;
  display: flex; flex-direction: column; gap: 2px;
  z-index: 40;
  pointer-events: none;
}
.rv-rail-title {
  font-family: var(--font-mono);
  font-size: 0.62rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--text3); margin-bottom: 14px;
}
.rv-rail a {
  pointer-events: auto;
  font-family: var(--font-mono);
  font-size: 0.74rem; letter-spacing: 0.01em;
  color: var(--text3); text-decoration: none;
  padding: 4px 0; display: flex; align-items: baseline; gap: 9px;
  transition: color .25s, transform .25s var(--ease-spring, cubic-bezier(.22,1,.36,1));
}
.rv-rail a .rv-rail-n {
  font-size: 0.62rem; opacity: .6; min-width: 12px;
}
.rv-rail a:hover { color: var(--text2); }
.rv-rail a.on { color: var(--text); transform: translateX(4px); }
.rv-rail a.on .rv-rail-n { opacity: 1; color: var(--warm); }

/* ── main column ── */
.rv-main { margin-left: var(--rv-rail-w); }
.rv-wrap { max-width: 920px; margin: 0 auto; padding: 0 32px; }

/* ── hero ── */
.rv-hero {
  position: relative;
  min-height: 86vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px 0 64px;
}
/* Nature-of-Code generative flow field behind the hero (not Ableton) */
.rv-hero-gen {
  position: absolute; inset: 0; z-index: 0;
  opacity: .62; pointer-events: none;
}
.rv-hero > *:not(.rv-hero-gen) { position: relative; z-index: 1; }

/* ── "the code that IS this sound" reveal (Engineermaxxing soul) ── */
.rv-code {
  margin: 26px 0 8px; border: 1px solid var(--border);
  border-radius: 14px; overflow: hidden; background: var(--bg-code, #0a0c12);
}
.rv-code summary {
  cursor: pointer; list-style: none;
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--warm);
  padding: 13px 17px; display: flex; align-items: center; gap: 9px;
}
.rv-code summary::-webkit-details-marker { display: none; }
.rv-code summary::before { content: "›"; transition: transform .2s; display: inline-block; }
.rv-code[open] summary::before { transform: rotate(90deg); }
.rv-code pre {
  margin: 0; padding: 4px 17px 18px;
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.65;
  color: #cdd6e6; overflow-x: auto;
}
.rv-code .cm { color: #6b7689; }
.rv-code .kw { color: var(--purple); }
.rv-code .fn { color: var(--teal); }
.rv-code .nm { color: var(--warm); }
.rv-code .st { color: var(--green); }

/* ── always-on code block with a language chip (multi-form code) ── */
.rv-codeblock {
  margin: 22px 0; border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; background: var(--bg-code, #0a0c12);
}
.rv-codeblock .rv-code-lang {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text3);
  padding: 10px 17px 0; display: block;
}
.rv-codeblock pre {
  margin: 0; padding: 8px 17px 18px;
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.65;
  color: #cdd6e6; overflow-x: auto;
}
.rv-codeblock .cm { color: #6b7689; }
.rv-codeblock .kw { color: var(--purple); }
.rv-codeblock .fn { color: var(--teal); }
.rv-codeblock .nm { color: var(--warm); }
.rv-codeblock .st { color: var(--green); }

/* ── math / formula block ── */
.rv-math {
  margin: 20px 0; padding: 20px 24px;
  background: var(--bg2); border: 1px solid var(--border);
  border-left: 3px solid var(--rv-accent, var(--teal));
  border-radius: 10px;
  font-family: var(--font-mono); font-size: 1.02rem; color: var(--text);
  text-align: center; letter-spacing: 0.01em; overflow-x: auto;
}
.rv-math .ann { display: block; margin-top: 10px; font-size: 0.74rem; color: var(--text3); letter-spacing: 0.02em; }
.rv-math sub { font-size: 0.7em; } .rv-math sup { font-size: 0.7em; }

/* ── derivation: numbered steps ── */
.rv-derive { margin: 22px 0; counter-reset: step; }
.rv-derive .step {
  display: flex; gap: 14px; padding: 11px 0;
  border-top: 1px solid var(--border);
}
.rv-derive .step:first-child { border-top: none; }
.rv-derive .step::before {
  counter-increment: step; content: counter(step);
  flex: none; width: 24px; height: 24px; border-radius: 50%;
  background: color-mix(in srgb, var(--warm) 22%, transparent);
  color: var(--warm); font-family: var(--font-mono); font-size: 0.72rem;
  display: flex; align-items: center; justify-content: center;
}
.rv-derive .step > div { color: var(--text2); font-size: 0.97rem; }
.rv-derive .step code, .rv-prose code, .rv-call code {
  font-family: var(--font-mono); font-size: 0.86em;
  background: var(--bg2); padding: 1px 6px; border-radius: 5px; color: var(--text);
}

/* ── insight callout ── */
.rv-call {
  margin: 22px 0; padding: 16px 20px; border-radius: 12px;
  background: color-mix(in srgb, var(--rv-accent, var(--warm)) 9%, var(--bg2));
  border: 1px solid color-mix(in srgb, var(--rv-accent, var(--warm)) 26%, transparent);
}
.rv-call .rv-call-h {
  font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--rv-accent, var(--warm)); margin-bottom: 7px;
}
.rv-call p { margin: 0; color: var(--text2); font-size: 0.98rem; }
.rv-call p + p { margin-top: 0.7em; }

/* ── interactive teaching widgets (CircleSine, AdditiveLab) ── */
.rv-widget {
  margin: 30px 0; padding: 18px;
  border: 1px solid color-mix(in srgb, var(--rv-accent, var(--purple)) 22%, var(--border));
  border-radius: 18px; background: var(--bg2);
}
.rv-widget-canvas {
  position: relative; width: 100%; aspect-ratio: 16 / 6;
  border-radius: 12px; overflow: hidden;
  background:
    radial-gradient(120% 150% at 26% 14%,
      color-mix(in srgb, var(--rv-accent, var(--purple)) 26%, var(--bg)),
      color-mix(in srgb, var(--rv-accent, var(--purple)) 8%, var(--bg)));
}
.rv-widget-canvas canvas { position: absolute; inset: 0; display: block; }
.rv-wrow { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.rv-wbtn {
  font-family: var(--font-mono); font-size: 0.8rem; padding: 9px 16px;
  border-radius: 10px; border: 1px solid var(--border); background: var(--bg3);
  color: var(--text); cursor: pointer; transition: all .2s;
}
.rv-wbtn:hover { border-color: var(--border2); }
.rv-wbtn.on { background: var(--rv-accent, var(--purple)); color: var(--bg); border-color: transparent; }
.rv-wslider { flex: 1; min-width: 170px; display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--text3); text-transform: uppercase; letter-spacing: .08em; }
.rv-wslider input[type=range] { flex: 1; accent-color: var(--rv-accent, var(--purple)); cursor: pointer; }
.rv-wread { font-family: var(--font-mono); font-size: 0.74rem; color: var(--text2); display: flex; gap: 16px; flex-wrap: wrap; }
.rv-wread b { color: var(--text); }

.rv-hsliders { display: flex; gap: 8px; align-items: stretch; height: 150px; margin-top: 16px; }
.rv-hslider { display: flex; flex-direction: column; align-items: center; gap: 7px; flex: 1; }
.rv-hslider input[type=range] {
  writing-mode: vertical-lr; direction: rtl; width: 8px; flex: 1;
  accent-color: var(--rv-accent, var(--purple)); cursor: pointer;
}
.rv-hslider span { font-family: var(--font-mono); font-size: 0.6rem; color: var(--text3); }

.rv-codecell { margin-top: 18px; }
.rv-codecell label {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--warm); display: block; margin-bottom: 9px;
}
.rv-codecell-row { display: flex; gap: 10px; align-items: center; }
.rv-codecell .rv-prefix { font-family: var(--font-mono); font-size: 0.84rem; color: var(--text3); }
.rv-codecell input[type=text] {
  flex: 1; font-family: var(--font-mono); font-size: 0.84rem;
  background: var(--bg-code, #0a0c12); color: #cdd6e6;
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px;
}
.rv-codecell input[type=text]:focus { outline: none; border-color: var(--rv-accent, var(--purple)); }
.rv-codemsg { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text3); margin-top: 9px; min-height: 1em; }

/* ── concept tie-back tags + demo chips (the playable capstone) ── */
.rv-itag {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em;
  color: var(--text3); padding: 6px 11px; border-radius: 8px;
  border: 1px solid var(--border); transition: all .2s;
}
.rv-itag.on {
  color: var(--bg); background: var(--rv-accent, var(--purple));
  border-color: transparent; transform: translateY(-1px);
}
.rv-demo-label {
  font-family: var(--font-mono); font-size: 0.62rem; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--text3);
}

/* ── data table ── */
.rv-table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.9rem; }
.rv-table th, .rv-table td {
  text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
}
.rv-table th { color: var(--text3); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 400; }
.rv-table td { color: var(--text2); }
.rv-table td b { color: var(--text); }
.rv-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.26em; text-transform: uppercase;
  color: var(--warm); margin-bottom: 22px;
}
.rv-hero h1 {
  font-family: var(--font-display);
  font-weight: 400; line-height: 1.02;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  letter-spacing: -0.01em; margin: 0 0 24px;
}
.rv-hero h1 em { font-style: italic; color: var(--warm); }
.rv-lede {
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
  color: var(--text2); max-width: 30em; margin: 0 0 40px;
}
.rv-scroll-cue {
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--text3);
  display: inline-flex; align-items: center; gap: 10px;
}
.rv-scroll-cue::after {
  content: ""; width: 1px; height: 34px;
  background: linear-gradient(var(--text3), transparent);
}

/* ── chapter section ── */
.rv-chapter {
  padding: 9vh 0;
  border-top: 1px solid var(--border);
}
.rv-chapter:first-of-type { border-top: none; }
.rv-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--text3); margin-bottom: 14px;
  display: flex; align-items: baseline; gap: 12px;
}
.rv-eyebrow b { color: var(--warm); font-weight: 400; }
.rv-chapter h2 {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.06;
  letter-spacing: -0.01em; margin: 0 0 22px;
}
.rv-prose { max-width: 38em; }
.rv-prose p { color: var(--text2); margin: 0 0 1.1em; font-size: 1.06rem; }
.rv-prose strong { color: var(--text); font-weight: 600; }
.rv-prose em { color: var(--warm); font-style: italic; }

/* ── the draggable panel (the Ableton primitive) ── */
.rv-panel {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 7;
  margin: 34px 0 16px;
  border-radius: 22px;
  overflow: hidden;
  cursor: grab;
  user-select: none;
  background:
    radial-gradient(125% 150% at 28% 16%,
      color-mix(in srgb, var(--rv-accent, var(--purple)) 52%, var(--bg2)),
      color-mix(in srgb, var(--rv-accent, var(--purple)) 16%, var(--bg)));
  border: 1px solid color-mix(in srgb, var(--rv-accent, var(--purple)) 34%, transparent);
  box-shadow: 0 24px 60px -28px color-mix(in srgb, var(--rv-accent, var(--purple)) 60%, transparent);
  transition: box-shadow .3s, border-color .3s;
}
.rv-panel.rv-grab { cursor: grabbing; }
.rv-panel:hover {
  border-color: color-mix(in srgb, var(--rv-accent, var(--purple)) 52%, transparent);
}
.rv-panel canvas { position: absolute; inset: 0; display: block; }
.rv-panel-readout {
  position: absolute; top: 16px; left: 18px;
  font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.04em; color: var(--text);
  background: color-mix(in srgb, var(--bg) 42%, transparent);
  padding: 5px 11px; border-radius: 8px;
  backdrop-filter: blur(6px);
  pointer-events: none;
}
.rv-panel-tag {
  position: absolute; top: 16px; right: 18px;
  font-family: var(--font-mono); font-size: 0.6rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--text2);
  pointer-events: none;
}
.rv-tap-hint {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text);
  opacity: .85; transition: opacity .4s; pointer-events: none;
}
.rv-panel.played .rv-tap-hint { opacity: 0; }

.rv-hint {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text3); margin: 4px 0 0; letter-spacing: 0.01em;
}

/* ── waveform shape buttons ── */
.rv-shapes { display: flex; gap: 10px; flex-wrap: wrap; margin: 20px 0 6px; }
.rv-shape-btn {
  font-family: var(--font-mono); font-size: 0.74rem;
  color: var(--text2); background: var(--bg2);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 15px; cursor: pointer;
  transition: all .2s;
}
.rv-shape-btn:hover { color: var(--text); border-color: var(--border2); }
.rv-shape-btn.on {
  color: var(--bg); background: var(--rv-accent, var(--purple));
  border-color: var(--rv-accent, var(--purple));
}

/* ── "Open in Playground →" escape hatch ── */
.rv-playground {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--warm); text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--warm) 45%, transparent);
  padding-bottom: 2px; margin-top: 8px;
  transition: gap .2s, color .2s;
}
.rv-playground:hover { gap: 12px; color: var(--warm2); }

/* ── the closing reveal ── */
.rv-reveal {
  padding: 16vh 0;
  text-align: center;
}
.rv-reveal p {
  font-family: var(--font-display); font-style: italic;
  font-size: clamp(1.6rem, 4vw, 2.8rem); line-height: 1.25;
  color: var(--text); max-width: 18em; margin: 0 auto;
}
.rv-reveal p em { color: var(--warm); }

/* ── prev/next journey bar (injected by reverb.js on every lesson) ── */
.rv-journey {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: stretch;
  margin: 40px 0 8px; padding-top: 28px; border-top: 1px solid var(--border);
}
.rv-journey-link {
  display: flex; flex-direction: column; gap: 4px; text-decoration: none;
  border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px;
  transition: border-color .25s, transform .25s var(--ease-spring, cubic-bezier(.22,1,.36,1));
}
.rv-journey-link.empty { border: none; }
.rv-journey-link.next { text-align: right; }
.rv-journey-link:hover { border-color: var(--warm); transform: translateY(-2px); }
.rv-journey-dir { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--warm); }
.rv-journey-title { font-family: var(--font-display); font-size: 1.05rem; color: var(--text); }
.rv-journey-pg {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em;
  color: var(--text2); text-decoration: none; padding: 0 18px;
  border: 1px solid var(--border); border-radius: 14px; white-space: nowrap;
  transition: color .2s, border-color .2s;
}
.rv-journey-pg:hover { color: var(--warm); border-color: var(--warm); }

/* ── persistent Studio button (always one tap from the Playground) ── */
.rv-studio-fab {
  position: fixed; right: 18px; bottom: 18px; z-index: 60;
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.04em;
  color: var(--bg); background: var(--warm); text-decoration: none;
  padding: 11px 16px; border-radius: 999px;
  box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--warm) 70%, transparent);
  transition: transform .2s var(--ease-spring, cubic-bezier(.22,1,.36,1)), background .2s;
}
.rv-studio-fab:hover { transform: translateY(-2px) scale(1.03); background: var(--warm2); }
.rv-studio-fab span { font-size: 0.9rem; }
@media (max-width: 720px) {
  .rv-journey { grid-template-columns: 1fr; }
  .rv-journey-link.next { text-align: left; }
  .rv-studio-fab { right: 12px; bottom: 12px; padding: 9px 13px; font-size: 0.72rem; }
}

/* ── footer ── */
.rv-foot {
  border-top: 1px solid var(--border);
  padding: 40px 0 80px;
  font-family: var(--font-mono); font-size: 0.74rem; color: var(--text3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.rv-foot a { color: var(--text2); text-decoration: none; }
.rv-foot a:hover { color: var(--text); }

/* ── index / front-door cards ── */
.rv-tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin: 48px 0; }
.rv-track {
  border: 1px solid var(--border); border-radius: 20px;
  padding: 30px 28px; background: var(--bg2);
  transition: border-color .3s, transform .3s var(--ease-spring, cubic-bezier(.22,1,.36,1));
}
.rv-track:hover { border-color: var(--border2); transform: translateY(-3px); }
.rv-track h3 {
  font-family: var(--font-display); font-weight: 400;
  font-size: 1.5rem; margin: 0 0 6px;
}
.rv-track .rv-track-k {
  font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--warm); margin-bottom: 16px;
}
.rv-track p { color: var(--text2); font-size: 0.95rem; margin: 0 0 18px; }
.rv-track ol { margin: 0; padding-left: 1.2em; color: var(--text3); font-size: 0.88rem; line-height: 1.9; }
.rv-track ol b { color: var(--text2); font-weight: 600; }
.rv-track ol a { color: var(--text2); text-decoration: none; }
.rv-track ol a:hover { color: var(--warm); }
.rv-track ol a:hover b { color: var(--warm); }
.rv-live {
  font-family: var(--font-mono); font-size: 0.54rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--green); vertical-align: middle;
  border: 1px solid color-mix(in srgb, var(--green) 40%, transparent);
  border-radius: 5px; padding: 1px 5px; margin-left: 6px;
}

.rv-lesson-link {
  display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--border); border-radius: 18px;
  padding: 26px 26px; background: var(--bg2);
  transition: border-color .3s, transform .3s var(--ease-spring, cubic-bezier(.22,1,.36,1));
}
.rv-lesson-link:hover { border-color: var(--warm); transform: translateY(-3px); }
.rv-lesson-link .rv-track-k { color: var(--warm); }
.rv-soon {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text4);
  border: 1px solid var(--border); border-radius: 6px; padding: 2px 8px;
}

/* ── responsive: collapse the rail on narrow screens ── */
@media (max-width: 900px) {
  .rv-rail { display: none; }
  .rv-main { margin-left: 0; }
  .rv-wrap { padding: 0 22px; }
  .rv-tracks { grid-template-columns: 1fr; }
  .rv-panel { aspect-ratio: 4 / 3; }
}