/* ── Vaaani shell ─────────────────────────────────────────────────────────────
 * The design system the 2026-07-13 site revamp established: tokens, nav,
 * typography, and the card/button primitives. Lifted verbatim from
 * phonetics-lab.html, which was the reference implementation.
 *
 * Why a file and not another inline copy: the revamp shipped its shell inline on
 * every page it touched, so pages drifted into two families — new (index,
 * phonetics-lab, learn, pricing, about, contact, semantic-sandbox) and old
 * (sound-lab, roots, privacy, parental-consent, on the legacy style.css +
 * page.css with a whole different token vocabulary: --c-bg, --c-border,
 * --nav-h). A child crossing between them thought they had left the site.
 *
 * Pages own their instrument CSS; the shell owns everything around it.
 * ─────────────────────────────────────────────────────────────────────────── */

:root{
  --bg:#faf7f0; --panel:#fff; --ink:#1b2422; --ink-2:#4c5551; --muted:#8a8a97;
  --line:#e6e4de; --line-2:#efeee9; --accent:#0f766e; --accent-soft:#e2f0ec;
  --good:#0f9d6b; --good-soft:#e6f6ef; --warn:#c98a12; --warn-soft:#fdf3d8;
  --bad:#d64545; --bad-soft:#fbe9e9;
  --shadow:0 1px 2px rgba(20,20,40,.04),0 8px 30px rgba(20,20,40,.05);
  --mono:'JetBrains Mono',monospace;
  --nav-h:62px;   /* legacy pages positioned content off this; keep it true */
}

*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:Inter,system-ui,sans-serif;
  line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
.mono{font-family:var(--mono)}
.accent{color:var(--accent)}

/* ── nav ── */
nav{position:sticky;top:0;z-index:50;background:rgba(250,247,240,.95);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h);
  max-width:900px;margin:0 auto;padding:0 22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.brand svg{width:23px;height:23px;color:var(--accent)}
.nav-links{display:flex;align-items:center;flex-wrap:wrap}
.nav-links a{font-size:14px;color:var(--ink-2);font-weight:500;margin-left:18px}
.nav-links a:hover{color:var(--ink)}
.nav-links a[aria-current="page"]{color:var(--accent);font-weight:600}
@media(max-width:560px){
  .nav-in{height:auto;min-height:var(--nav-h);padding:10px 16px;flex-wrap:wrap;gap:6px}
  .nav-links a{margin-left:0;margin-right:16px}
}

/* ── page frame ── */
main{max-width:900px;margin:0 auto;padding:34px 22px 90px}
.eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--muted)}
h1{font-size:clamp(28px,4.4vw,40px);line-height:1.08;letter-spacing:-.02em;
  font-weight:800;margin:10px 0 8px}
h1 .serif{font-family:'Instrument Serif',Georgia,serif;font-style:italic;font-weight:400}
h2{font-size:22px;line-height:1.2;letter-spacing:-.01em;font-weight:800;margin:26px 0 10px}
h3{font-size:17px;font-weight:700;margin:18px 0 6px}
.sub{font-size:16.5px;color:var(--ink-2);max-width:38em;margin-bottom:26px}

.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:22px 24px;box-shadow:var(--shadow);margin-bottom:18px}
.card-h{font-family:var(--mono);font-size:11px;letter-spacing:.05em;
  text-transform:uppercase;color:var(--muted);margin-bottom:12px}

.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;
  border-radius:11px;padding:13px 20px;font-size:15px;font-weight:600;cursor:pointer;
  font-family:inherit;transition:.15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#0b5c56}
.btn-ghost{background:var(--panel);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:#c9c7bf}
.btn:disabled{opacity:.5;cursor:default}
.btn.lg{padding:15px 24px;font-size:16px}
/* the arrow that leans forward on hover — carried over from the legacy shell */
.btn .arr{transition:transform .25s ease}
.btn:hover .arr{transform:translateX(3px)}

.back-link{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--ink-2);
  padding:8px 14px;border-radius:9px;border:1px solid var(--line);background:var(--panel);
  transition:border-color .2s,color .2s;margin-bottom:24px}
.back-link:hover{border-color:#c9c7bf;color:var(--ink)}

.banner{display:none;background:var(--warn-soft);border:1px solid #f0e0b8;color:var(--warn);
  border-radius:10px;padding:11px 14px;font-size:13.5px;margin-bottom:14px}

/* ── prose, for the text pages (privacy, parental consent) ── */
.prose{max-width:44em}
.prose p,.prose li{font-size:15.5px;color:var(--ink-2);margin-bottom:12px}
.prose b,.prose strong{color:var(--ink)}
.prose ul,.prose ol{padding-left:22px;margin-bottom:12px}
.prose a{color:var(--accent);font-weight:600;text-decoration:underline}
.prose hr{border:0;border-top:1px solid var(--line);margin:28px 0}
.prose table{width:100%;border-collapse:collapse;margin-bottom:16px;font-size:14.5px}
.prose th,.prose td{text-align:left;padding:9px 12px;border:1px solid var(--line)}
.prose th{background:#f4f3ef;font-weight:700;color:var(--ink)}

/* ── footer: the canonical one from index.html ── */
.wrap{max-width:900px;margin:0 auto;padding:0 22px}
footer{border-top:1px solid var(--line);padding:48px 0 34px;margin-top:20px}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px}
@media(max-width:760px){.foot{grid-template-columns:1fr 1fr}}
.foot p{font-size:13.5px;color:var(--muted);margin-top:10px;max-width:26em}
.foot h5{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);
  margin-bottom:12px;font-family:var(--mono)}
.foot a{display:block;font-size:14px;color:var(--ink-2);margin-bottom:8px}
.foot a:hover{color:var(--ink)}
.foot-line{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-top:34px;
  padding-top:20px;border-top:1px solid var(--line-2);font-size:12.5px;color:var(--muted)}

/* No `.reveal` here on purpose. The legacy shell had one at opacity:0 that relied
 * on an IntersectionObserver to add `.in` — and none of the scripts these pages
 * load do that, so importing it would hide content permanently. If a page wants
 * reveal-on-scroll it must ship the observer alongside it. */