/* --- Header (chrome, not a section) -------------------------------------- */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  color: var(--on-video);
  border-bottom: 1px solid transparent;
  transition: background 0.45s var(--ease), border-color 0.45s var(--ease), color 0.45s var(--ease);
}
.header.is-stuck {
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  backdrop-filter: blur(14px) saturate(1.1);
  border-bottom-color: var(--rule);
}
@supports not (backdrop-filter: blur(1px)) {
  .header.is-stuck { background: var(--paper); }
}

.header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.lockup--mark { font-size: 1.7rem; align-items: flex-start; }
.lockup--mark .lockup__sub { font-size: 0.2em; margin-top: 0.35em; }

/* --- Buttons (radius 0, one accent) -------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65em;
  white-space: nowrap;
  font-family: 'Jost', system-ui, sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 1rem 1.75rem;
  background: var(--sage);
  color: var(--sage-ink);
  border: 1px solid var(--sage);
  transition: transform 0.25s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}
.btn .arw { transition: transform 0.35s var(--ease); }
.btn:hover { background: transparent; color: var(--sage); }
.btn:hover .arw { transform: translateX(5px); }
.btn:active { transform: translateY(1px); }

.btn--lg { padding: 1.15rem 2.25rem; font-size: 0.8125rem; }

/* Sits over the video, so it carries its own contrast rather than relying on
   whatever frame happens to be playing behind it. */
.btn--quiet {
  background: transparent;
  color: currentColor;
  border-color: color-mix(in srgb, currentColor 45%, transparent);
  padding: 0.75rem 1.35rem;
}
@supports not (color: color-mix(in srgb, red 50%, transparent)) {
  .btn--quiet { border-color: var(--rule-strong); }
}
.btn--quiet:hover {
  background: var(--sage);
  color: var(--sage-ink);
  border-color: var(--sage);
}

/* On the ivory ground, an underlined text link reads better than a third
   button weight. */
.link {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sage);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid color-mix(in srgb, var(--sage) 40%, transparent);
  transition: border-color 0.3s var(--ease);
}
.link:hover { border-bottom-color: var(--sage); }