/* ── Progress ── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  height: 1px;
  width: 100%;
  transform-origin: left;
  transform: scaleX(0);
  background: var(--color-accent);
  pointer-events: none;
}

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  padding-inline: var(--gutter);
  transition:
    background var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    backdrop-filter var(--duration-normal) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(247, 247, 245, 0.82);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
}

.site-header.is-dark {
  background: rgba(12, 12, 14, 0.75);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-dark);
}

.site-header.is-dark .site-logo,
.site-header.is-dark .site-nav a,
.site-header.is-dark .site-nav-toggle {
  color: var(--color-text-on-dark);
}

.site-header.is-dark .site-nav a.is-active {
  color: var(--color-text-on-dark);
  background: rgba(255, 255, 255, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width-wide);
  height: 100%;
  margin-inline: auto;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text);
  opacity: 0.9;
}

.site-logo__mark,
.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  opacity: 0.45;
  flex-shrink: 0;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 0.125rem;
}

@media (min-width: 960px) {
  .site-nav { display: flex; }
}

.site-nav a {
  padding: 0.45rem 0.65rem;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  border-radius: 999px;
  transition: color var(--duration-fast), background var(--duration-fast);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-text);
  background: var(--color-accent-soft);
}

.site-nav--site a.is-active {
  color: var(--color-text);
}

.site-header--subpage {
  background: rgba(247, 247, 245, 0.92);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
}

.site-header--subpage .site-nav a {
  color: var(--color-text-secondary);
}

.site-nav-toggle {
  display: flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

@media (min-width: 960px) {
  .site-nav-toggle { display: none; }
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0;
  z-index: 99;
  padding: 2rem var(--gutter);
  background: rgba(247, 247, 245, 0.96);
  backdrop-filter: blur(24px);
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav.is-open { display: flex; }

.mobile-nav a {
  padding: 1rem 0;
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  border-bottom: 1px solid var(--color-border);
}

/* ── Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--duration-reveal) var(--ease-out),
    transform var(--duration-reveal) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-d1 { transition-delay: 100ms; }
.reveal-d2 { transition-delay: 200ms; }
.reveal-d3 { transition-delay: 320ms; }
.reveal-d4 { transition-delay: 440ms; }
.reveal-d5 { transition-delay: 560ms; }

/* ── Footer ── */
.site-footer {
  padding: 3rem var(--gutter) 2.5rem;
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark-muted);
}

.site-footer__inner {
  max-width: var(--max-width-wide);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
  align-items: flex-end;
}

.site-footer__brand {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-on-dark);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1rem;
}

.site-footer__nav a {
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-text-on-dark-muted);
}

.site-footer__nav a:hover {
  color: var(--color-text-on-dark);
}

.site-footer__copy {
  margin-top: 0.5rem;
  font-size: var(--text-xs);
}

.site-footer a {
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-muted);
  transition: color var(--duration-fast);
}

.site-footer a:hover {
  color: var(--color-text-on-dark);
}