/* ── Sub-page shell (matches index h2 / body scale) ─────────────── */
  .page-hero { padding: calc(var(--pad-y) * 0.85) 0 calc(var(--pad-y) * 0.25); }
  .page-hero-inner,
  .page-body-inner { max-width: 820px; }
  .page-body-inner { position: relative; padding-top: 26px; }
  .page-body-inner::before {
    content: ''; position: absolute; top: 0; left: 0; width: 46px; height: 1px;
    background: linear-gradient(90deg, var(--accent), var(--teal));
  }
  .page-kicker {
    font-family: var(--sans);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .22em;
    color: var(--accent);
    text-transform: uppercase;
    margin: 0 0 22px;
  }
  .page-h1 {
    font-family: var(--sans);
    font-optical-sizing: auto;
    font-weight: 620;
    font-size: clamp(24px, 2.8vw, 34px);
    letter-spacing: -.015em;
    line-height: 1.18;
    color: var(--page-text);
    margin: 0 0 20px;
  }
  .page-lede {
    font-family: var(--sans);
    font-size: clamp(17px, 1.4vw, 19px);
    line-height: 1.6;
    color: var(--page-text-secondary);
    max-width: 720px;
    margin: 0;
  }
  .page-body { padding: calc(var(--pad-y) * 0.32) 0 calc(var(--pad-y) * 0.62); }
  .page-p {
    font-family: var(--sans);
    font-size: clamp(15px, 1.15vw, 17px);
    line-height: 1.72;
    color: var(--page-text-secondary);
    margin: 0 0 20px;
    text-align: left;
  }
  .page-p:last-child { margin-bottom: 0; }
  .page-sect { background: transparent !important; border: 0 !important; }

  /* ── Page tone variants (scoped to page content, not <body>) ─────
     Using --page-text / --page-text-secondary so we do NOT stomp the
     site-wide --text tokens the fixed nav panel relies on. */
  .page-tone-warm  { background: #f4f0e8; --page-text: #14171f; --page-text-secondary: rgba(20,23,31,0.72); }
  .page-tone-blue  { background: #0d1a2e; --page-text: #ecf1fa; --page-text-secondary: rgba(236,241,250,0.75); }
  .page-tone-deep  { background: #080a10; --page-text: #ecedf1; --page-text-secondary: rgba(236,237,241,0.75); }
  .page-tone-slate { background: #1a1f2b; --page-text: #ecedf1; --page-text-secondary: rgba(236,237,241,0.75); }

  /* ── Implementation timeline ─────────────────────────────────────── */
  .impl-timeline-sect { padding: calc(var(--pad-y) * 0.65) 0 var(--pad-y); border-top: 1px solid var(--border); }
  .impl-timeline { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(28px, 4vw, 48px); }
  .impl-phase { border-top: 1px solid var(--border); padding-top: 18px; position: relative; }
  .impl-phase::after {
    content: ''; position: absolute; top: -1px; left: 0; width: 0; height: 1px;
    background: linear-gradient(90deg, var(--accent), var(--teal));
    transition: width .8s cubic-bezier(.16,1,.3,1) .1s;
  }
  .impl-phase.in::after { width: 46px; }
  .impl-phase-dur { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
  .impl-phase-t { font-family: var(--sans); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; color: var(--page-text); margin-bottom: 10px; }
  .impl-phase-d { font-family: var(--sans); font-size: 15px; line-height: 1.62; color: var(--page-text-secondary); max-width: 34ch; }
  @media (max-width: 760px) {
    .impl-timeline { grid-template-columns: 1fr; gap: 34px; }
    .impl-phase-d { max-width: none; }
  }

  /* ── Sub-page nav stays legible over any tone ───────────────────── */
  .page nav#nav {
    background: rgba(10,12,18,0.94);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .page nav#nav .nav-link,
  .page nav#nav .logo-word { color: #ecedf1; }
  .page nav#nav .nav-link:hover { color: #fff; }
