/* ============================================
   THE INFINITE CHORALE — standalone tool page.
   Site tokens + content-page chrome; dark mode keys off body.dark-mode.
   The staff always sits on a light "paper" panel (notation stays ink).
   ============================================ */

:root {
    --ch-ink: #1c1917; --ch-muted: #6b6560; --ch-line: #e7e5e4;
    --ch-bg: #fbfbfa; --ch-card: #fff; --ch-paper: #fffdf8;
    --ch-accent: #0d9488; --ch-accent-dark: #0b7c72; --ch-accent-soft: #f0fdfa;
    --ch-amber: #b45309; --ch-amber-soft: #fffbeb;
    --ch-rose: #be185d; --ch-rose-soft: #fdf2f8;
}
body.dark-mode {
    --ch-ink: #f5f5f4; --ch-muted: #a8a29e; --ch-line: #3a3633;
    --ch-bg: #1a1817; --ch-card: #242120; --ch-paper: #faf9f7;
    --ch-accent: #2dd4bf; --ch-accent-dark: #5eead4; --ch-accent-soft: #132a27;
    --ch-amber: #fbbf24; --ch-amber-soft: #2c2311;
    --ch-rose: #f472b6; --ch-rose-soft: #331522;
}

body { background: var(--ch-bg); color: var(--ch-ink); margin: 0;
    font-family: Inter, -apple-system, system-ui, sans-serif; line-height: 1.55; }
.ch-wrap { width: 100%; max-width: 980px; margin: 0 auto; padding: 0 20px; box-sizing: border-box; }

/* ---------- intro ---------- */
.ch-intro { padding: 30px 0 6px; }
.ch-intro h1 { font-size: clamp(26px, 4.5vw, 38px); margin: 0 0 8px; letter-spacing: -.02em; font-weight: 800;
    font-family: Fraunces, Georgia, serif; }
.ch-intro .lead { color: var(--ch-muted); font-size: 16px; margin: 0 0 4px; max-width: 720px; }
.ch-intro .sublead { color: var(--ch-muted); font-size: 13.5px; margin: 0; }
.ch-intro .sublead b { color: var(--ch-accent-dark); }

/* ---------- the instrument card ---------- */
.ch-card { background: var(--ch-card); border: 1px solid var(--ch-line); border-radius: 16px;
    padding: 18px 20px 20px; box-shadow: 0 2px 10px rgba(0,0,0,.05); margin-top: 18px; }

.ch-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.ch-btn { font: inherit; font-weight: 700; border: none; border-radius: 10px;
    padding: 10px 15px; cursor: pointer; transition: transform .1s, box-shadow .12s; }
.ch-btn:active { transform: translateY(1px); }
.ch-btn:disabled { opacity: .38; cursor: default; box-shadow: none; }
.ch-btn-primary { background: linear-gradient(135deg, #14b8a6, #0d9488); color: #fff;
    box-shadow: 0 4px 12px rgba(13,148,136,.3); }
.ch-btn-primary:hover { box-shadow: 0 6px 16px rgba(13,148,136,.4); }
.ch-btn-ghost { background: transparent; color: var(--ch-accent); border: 1.5px solid var(--ch-accent-soft); font-size: 14px; }
body.dark-mode .ch-btn-ghost { border-color: #2f5c56; }
.ch-btn-ghost:hover:not(:disabled) { background: var(--ch-accent-soft); border-color: var(--ch-accent); }

.ch-controls .sep { flex: 1; }
.ch-select, .ch-range { font: inherit; font-size: 13.5px; }
.ch-select { padding: 8px 10px; border: 1px solid var(--ch-line); border-radius: 9px;
    background: var(--ch-card); color: var(--ch-ink); }
.ch-tempo-wrap { display: inline-flex; align-items: center; gap: 8px; color: var(--ch-muted); font-size: 13px; }
.ch-range { accent-color: var(--ch-accent); width: 110px; }

/* ---------- staff panel + begin overlay ---------- */
.ch-stage { position: relative; }
.ch-staffpanel { background: var(--ch-paper); border: 1px solid var(--ch-line); border-radius: 12px;
    padding: 6px 10px; overflow: hidden; }
.ch-staffpanel svg { width: 100%; height: auto; display: block; }
.ch-begin { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
    background: color-mix(in srgb, var(--ch-card) 55%, transparent); backdrop-filter: blur(3px);
    border-radius: 12px; border: none; cursor: pointer; font: inherit; }
.ch-begin.hidden { display: none; }
.ch-begin span { background: linear-gradient(135deg, #14b8a6, #0d9488); color: #fff; font-weight: 800;
    font-size: 18px; padding: 16px 30px; border-radius: 100px; box-shadow: 0 8px 24px rgba(13,148,136,.4); }

/* ---------- the "now" readout ---------- */
.ch-now { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin: 12px 2px 0; }
.ch-now-label { font-family: Georgia, serif; font-style: italic; font-weight: 700;
    font-size: 30px; color: var(--ch-accent-dark); min-width: 64px; }
.ch-now-fn { font-size: 13.5px; font-weight: 700; color: var(--ch-ink); }
.ch-now-notes { font-size: 12.5px; color: var(--ch-muted); }
.ch-queued { margin-left: auto; font-size: 12.5px; font-weight: 700; color: var(--ch-amber); }

/* ---------- conductor buttons ---------- */
.ch-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.ch-actions .ch-btn { font-size: 14px; }

/* ---------- feed ---------- */
.ch-feedwrap { margin-top: 16px; border-top: 1px solid var(--ch-line); padding-top: 12px; }
.ch-feedwrap h2 { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .07em;
    color: var(--ch-muted); margin: 0 0 8px; }
.ch-feed { list-style: none; margin: 0; padding: 0; max-height: 240px; overflow-y: auto; }
.ch-feed li { font-size: 13.5px; color: var(--ch-muted); padding: 5px 8px; border-radius: 8px; margin-bottom: 3px; }
.ch-feed li b { color: var(--ch-ink); }
.ch-feed-cadence { background: var(--ch-accent-soft); }
.ch-feed-cadence b { color: var(--ch-accent-dark); }
.ch-feed-deceptive { background: var(--ch-rose-soft); }
.ch-feed-deceptive b { color: var(--ch-rose); }
.ch-feed-pivot { background: var(--ch-amber-soft); }
.ch-feed-pivot b { color: var(--ch-amber); }
.ch-feed-relaxed { border: 1px dashed var(--ch-line); font-style: italic; }
.ch-feed-system { font-weight: 600; }

/* ---------- meta row ---------- */
.ch-meta { display: flex; gap: 14px; align-items: baseline; flex-wrap: wrap; margin-top: 14px;
    padding-top: 12px; border-top: 1px solid var(--ch-line); font-size: 12.5px; color: var(--ch-muted); }
.ch-meta b { color: var(--ch-ink); }
.ch-share { margin-left: auto; font: inherit; font-size: 12.5px; font-weight: 700;
    color: var(--ch-accent); background: none; border: none; cursor: pointer; padding: 0; }
.ch-share:hover { text-decoration: underline; }
.ch-status { font-size: 12.5px; color: var(--ch-muted); margin-top: 6px; min-height: 1.2em; }

/* ---------- educational content ---------- */
.ch-content { margin: 30px 0 50px; }
.ch-content h2 { font-size: 20px; margin: 26px 0 8px; font-weight: 800; }
.ch-content h3 { font-size: 15.5px; margin: 16px 0 5px; font-weight: 700; }
.ch-content p, .ch-content li { color: var(--ch-muted); font-size: 14.5px; }
.ch-content a { color: var(--ch-accent); font-weight: 700; text-decoration: none; }
.ch-content a:hover { text-decoration: underline; }
.ch-content ul { padding-left: 20px; }
.ch-rules { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 22px; padding-left: 20px; }

@media (max-width: 680px) {
    .ch-rules { grid-template-columns: 1fr; }
    .ch-card { padding: 14px 12px 16px; }
    .ch-now-label { font-size: 24px; }
}