/* ═════════════════════════════════════════════════════════════════════
   PULSE Changelog — "Release log / instrument timeline"
   Matches the v3 language: near-black canvas, a vertical signal rail with
   release ticks, each release an instrument log panel, monospace version +
   date readouts (tabular), Ion Cyan as the live signal, the latest build
   marked with a cyan channel rule. Replaces the old inline <style> (which
   also carried dead .release-card + perspective floor-grid rules — the JS
   emits .release directly and the floor grid was already removed from DOM).

   Releases are injected by changelog-page.js into #releases as:
     .release[.latest]#vX.Y.Z > .release-header(.release-version/.release-date
     /.release-tag) + h3 + ul>li …   — all preserved here.

   Scoped under .changelog-page. Depends on shared.css + tokens-v3.css + bg.css.
   ═════════════════════════════════════════════════════════════════════ */

.changelog-page {
  font-family: var(--font-display);
  background: var(--ink-0);
  color: var(--text-1);
  line-height: var(--lead-body);
}

/* ── Layout ─────────────────────────────────────────────────────────── */
.changelog-page .page {
  position: relative;
  z-index: var(--z-content);
  max-width: 800px;
  margin: 0 auto;
  padding: clamp(116px, 15vh, 150px) var(--sp-6) var(--sp-9);
}
@media (max-width: 768px) { .changelog-page .page { padding-inline: var(--sp-5); } }

/* ── Header ─────────────────────────────────────────────────────────── */
.changelog-page .page-header { text-align: center; margin-bottom: var(--sp-9); }
.changelog-page .page-header .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0;
  background: none;
  border: 0;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  font-weight: 700;
  letter-spacing: var(--track-eyebrow);
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: var(--sp-5);
  padding-inline-start: 18px;
  position: relative;
}
.changelog-page .page-header .eyebrow::before {
  content: '';
  position: absolute;
  inset-inline-start: 0; top: 50%;
  width: 10px; height: 1px;
  transform: translateY(-50%);
  border-radius: 0;
  background: var(--c-500);
  box-shadow: none;
  animation: none;
}
.changelog-page h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.2vw, 3.4rem);
  font-weight: 700;
  letter-spacing: var(--track-mega);
  line-height: 1.04;
  margin-bottom: var(--sp-4);
  color: var(--text-1);
}
.changelog-page h1 .gradient-text {
  background: var(--grad-hero-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.changelog-page .sub {
  font-size: var(--tx-sm);
  color: var(--text-2);
  max-width: 56ch;
  margin: 0 auto;
  line-height: var(--lead-body);
}
.changelog-page .subscribe-row { margin-top: var(--sp-3); font-family: var(--font-mono); font-size: var(--tx-2xs); }
.changelog-page .subscribe-row a {
  color: var(--c-400);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 6px;
  letter-spacing: 0.04em;
}
.changelog-page .subscribe-row a:hover { text-decoration: underline; }
.changelog-page .changelog-loading {
  font-family: var(--font-mono);
  font-size: var(--tx-xs);
  letter-spacing: 0.04em;
  color: var(--text-3);
}

/* ── Timeline rail ──────────────────────────────────────────────────── */
.changelog-page .timeline { position: relative; padding-inline-start: 40px; }
.changelog-page .timeline::before {
  content: '';
  position: absolute;
  inset-inline-start: 15px;
  top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
    var(--line-accent) 0%, oklch(0.78 0.16 184 / 0.12) 30%,
    oklch(0.78 0.16 184 / 0.06) 70%, transparent 100%);
}
@media (max-width: 768px) {
  .changelog-page .timeline { padding-inline-start: 32px; }
  .changelog-page .timeline::before { inset-inline-start: 11px; }
}

/* ── Release → instrument log panel ─────────────────────────────────── */
.changelog-page .release {
  position: relative;
  margin-bottom: var(--sp-5);
  padding: var(--sp-6) var(--sp-6) var(--sp-5);
  border: 1px solid var(--line-2);
  border-radius: var(--r-3);
  background: oklch(0.08 0.006 250 / 0.5);
  box-shadow: var(--shadow-1), var(--inner-bevel);
  transition: border-color var(--dur-3) var(--ease-out-quart),
              transform var(--dur-3) var(--ease-out-quart);
}
.changelog-page .release:hover { border-color: var(--line-accent); transform: translateY(-2px); }
@media (max-width: 768px) { .changelog-page .release { padding: var(--sp-5); } }

/* Timeline tick */
.changelog-page .release::before {
  content: '';
  position: absolute;
  inset-inline-start: -33px;
  top: 30px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--ink-1);
  border: 2px solid var(--line-accent);
  z-index: 2;
  transition: all var(--dur-2);
}
.changelog-page .release:hover::before { background: var(--c-500); box-shadow: var(--glow-c-sm); }
@media (max-width: 768px) { .changelog-page .release::before { inset-inline-start: -27px; width: 9px; height: 9px; } }

/* Latest build — cyan channel + lit tick */
.changelog-page .release.latest {
  border-color: var(--line-accent);
  background: oklch(0.10 0.06 184 / 0.045);
  box-shadow: var(--shadow-2), var(--glow-c-sm), var(--inner-bevel);
  overflow: hidden;
}
.changelog-page .release.latest::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-500), transparent);
}
.changelog-page .release.latest::before { background: var(--c-500); border-color: var(--c-500); box-shadow: var(--glow-c-sm); }

/* Release header */
.changelog-page .release-header {
  display: flex; align-items: center; gap: var(--sp-3);
  margin-bottom: var(--sp-4); flex-wrap: wrap;
}
@media (max-width: 768px) { .changelog-page .release-header { flex-direction: column; align-items: flex-start; gap: var(--sp-2); } }
.changelog-page .release-version {
  font-family: var(--font-mono);
  font-size: var(--tx-lg);
  font-weight: 700;
  letter-spacing: 0;
  color: var(--text-1);
  font-variant-numeric: tabular-nums;
}
.changelog-page .release-date {
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  color: var(--text-3);
  padding: 4px 10px;
  background: oklch(0.06 0.005 250 / 0.6);
  border: 1px solid var(--line-2);
  border-radius: var(--r-1);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.changelog-page .release-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--r-1);
  background: oklch(0.78 0.16 184 / 0.10);
  border: 1px solid var(--line-accent);
  color: var(--c-400);
}

/* Section headings */
.changelog-page .release h3 {
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  font-weight: 700;
  color: var(--text-2);
  margin: var(--sp-5) 0 var(--sp-3);
  text-transform: uppercase;
  letter-spacing: var(--track-eyebrow);
  display: flex; align-items: center; gap: var(--sp-2);
}
.changelog-page .release h3::before { content: ''; width: 12px; height: 1px; background: var(--c-500); }

/* Bullets */
.changelog-page .release ul { padding: 0; margin: 0 0 var(--sp-3); list-style: none; }
.changelog-page .release li {
  font-size: var(--tx-sm);
  color: var(--text-2);
  margin-bottom: var(--sp-2);
  line-height: var(--lead-body);
  position: relative;
  padding-inline-start: 16px;
}
.changelog-page .release li::before {
  content: '';
  position: absolute;
  inset-inline-start: 0; top: 11px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--c-600);
}
.changelog-page .release li strong { color: var(--text-1); font-weight: 600; }
.changelog-page .release li a { color: var(--c-400); text-decoration: underline; text-underline-offset: 2px; }

/* ── CTA → instrument panel ─────────────────────────────────────────── */
.changelog-page .cta-section {
  position: relative;
  text-align: center;
  margin-top: var(--sp-9);
  padding: var(--sp-8) var(--sp-7);
  border-radius: var(--r-4);
  background: oklch(0.08 0.006 250 / 0.5);
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow-2), var(--inner-bevel);
  overflow: hidden;
}
.changelog-page .cta-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-500), transparent);
}
.changelog-page .cta-section p { font-size: var(--tx-base); color: var(--text-2); margin-bottom: var(--sp-5); }
.changelog-page .btn-dl {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 13px 30px;
  background: var(--c-500);
  color: #04201e;
  border: 0;
  border-radius: var(--r-2);
  font-family: var(--font-mono);
  font-size: var(--tx-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  box-shadow: var(--inner-bevel);
  transition: filter var(--dur-2) var(--ease-out-quart),
              transform var(--dur-2) var(--ease-out-quart),
              box-shadow var(--dur-2) var(--ease-out-quart);
}
.changelog-page .btn-dl:hover { filter: brightness(1.06); transform: translateY(-1px); box-shadow: var(--glow-c-md), var(--inner-bevel); }

/* ── Footer ─────────────────────────────────────────────────────────── */
.changelog-page .footer {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--sp-7) var(--sp-6);
  border-top: 1px solid var(--line-1);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: var(--sp-4);
  position: relative; z-index: var(--z-content);
}
@media (max-width: 768px) { .changelog-page .footer { flex-direction: column; text-align: center; } }
.changelog-page .footer-left { font-family: var(--font-mono); font-size: var(--tx-2xs); color: var(--text-3); letter-spacing: 0.03em; font-variant-numeric: tabular-nums; }
.changelog-page .footer-links { display: flex; gap: var(--sp-5); flex-wrap: wrap; }
.changelog-page .footer-links a {
  color: var(--text-3);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  letter-spacing: 0.03em;
  transition: color var(--dur-2) var(--ease-out-quart);
}
.changelog-page .footer-links a:hover { color: var(--c-400); }

/* ── Light-mode surfaces ────────────────────────────────────────────── */
[data-theme="light"] .changelog-page .release,
[data-theme="light"] .changelog-page .cta-section { background: oklch(0.99 0.003 250 / 0.7); }
[data-theme="light"] .changelog-page .release.latest { background: oklch(0.92 0.06 184 / 0.12); }
[data-theme="light"] .changelog-page .release-date { background: oklch(0.97 0.004 250 / 0.9); }
[data-theme="light"] .changelog-page .release li a { color: var(--c-800); }

/* ── Reduced motion ─────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .changelog-page .release:hover { transform: none; }
  .changelog-page .btn-dl:hover { transform: none; }
}