/* MPA View Transitions — nav persists across page navigations */
@view-transition {
  navigation: auto;
}
.site-nav       { view-transition-name: site-nav; }
.site-nav-bottom { view-transition-name: site-nav-bottom; }
.site-footer    { view-transition-name: site-footer; }

/* Instant swap — crossfade completes in 0s so nav stays pinned */
::view-transition-group(site-nav),
::view-transition-old(site-nav),
::view-transition-new(site-nav),
::view-transition-group(site-nav-bottom),
::view-transition-old(site-nav-bottom),
::view-transition-new(site-nav-bottom),
::view-transition-group(site-footer),
::view-transition-old(site-footer),
::view-transition-new(site-footer) {
  animation-duration: 0s;
}

:root {
  --nav-fg: #dee3e1;
  --nav-dim: #99a8a1;
  --nav-bg: #090a0a;
  --nav-border: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(9, 10, 10, 0.6);
}
[data-theme="light"] {
  --nav-fg: #141716;
  --nav-dim: #76867f;
  --nav-bg: #f2f3f2;
  --nav-border: rgba(0, 0, 0, 0.08);
  --bg-glass: rgba(242, 243, 242, 0.6);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(var(--anim-y, 24px)) scale(var(--anim-s, 1)); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes fadeIn {
  to { opacity: 1; }
}
@keyframes springIn {
  0%   { opacity: 0; transform: translateY(var(--anim-y, 34px)) scale(var(--anim-s, 0.92)); }
  65%  { opacity: 1; transform: translateY(-2px) scale(1.005); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.entrance {
  opacity: 0;
  transform: translateY(var(--anim-y, 24px)) scale(var(--anim-s, 1));
  animation: fadeUp var(--anim-dur, 0.7s) var(--anim-ease, cubic-bezier(0.16, 1, 0.3, 1)) var(--anim-delay, 0s) forwards;
}

.reveal {
  opacity: 0;
  transform: translateY(var(--anim-y, 24px)) scale(var(--anim-s, 1));
  transition: opacity var(--anim-dur, 0.7s) var(--anim-ease, cubic-bezier(0.16, 1, 0.3, 1)),
              transform var(--anim-dur, 0.7s) var(--anim-ease, cubic-bezier(0.16, 1, 0.3, 1));
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.anim-display { --anim-y: 48px; --anim-dur: 1.0s; }
.anim-title   { --anim-y: 32px; --anim-dur: 0.8s; }
.anim-body    { --anim-y: 20px; --anim-dur: 0.6s; }
.anim-caption { --anim-y: 12px; --anim-dur: 0.5s; }

.entrance[data-t="tag"]     { --anim-y: 16px; --anim-dur: 0.55s; --anim-s: 0.98; }
.entrance[data-t="title"]   { --anim-y: 32px; --anim-dur: 0.85s; --anim-s: 0.96; --anim-ease: cubic-bezier(0.22, 1.3, 0.36, 1); }
.entrance[data-t="sub"]     { --anim-y: 20px; --anim-dur: 0.65s; --anim-s: 0.99; }
.entrance[data-t="actions"] { --anim-y: 16px; --anim-dur: 0.6s; }
.entrance[data-t="section"] { --anim-y: 14px; --anim-dur: 0.55s; }
.entrance[data-t="card"]    { --anim-y: 34px; --anim-dur: 0.8s; --anim-s: 0.92; --anim-ease: cubic-bezier(0.34, 1.56, 0.64, 1); animation-name: springIn; }
.reveal[data-t="card"]      { --anim-y: 34px; --anim-dur: 0.8s; --anim-s: 0.92; --anim-ease: cubic-bezier(0.34, 1.56, 0.64, 1); }

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px;
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  line-height: 1.6;
}
html:not(.nav-seen) .site-nav {
  opacity: 1;
  transform: none;
  animation: none;
}
html:not(.nav-seen) .site-footer {
  opacity: 1;
  transform: none;
  animation: none;
}
html:not(.nav-seen) .site-nav-bottom {
  opacity: 1;
  transform: none;
  animation: none;
}

@keyframes siteNavIn {
  from { opacity: 0; transform: translateY(-100%); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes siteFooterIn {
  from { opacity: 0; transform: translateY(100%); }
  to   { opacity: 1; transform: translateY(0); }
}

.site-nav-logo {
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--nav-fg);
  text-decoration: none;
  transition: opacity 0.2s;
}
.site-nav-logo:hover { opacity: 0.7; }

.site-nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav-links a {
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
  font-weight: 400;
  color: var(--nav-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.site-nav-links a:hover { color: var(--nav-fg); }
.site-nav-links a.active { color: var(--nav-fg); }

.site-nav-links .site-nav-cta {
  color: var(--nav-fg);
  border: 1px solid var(--nav-border);
  padding: 5px 14px;
  border-radius: 1px;
  transition: color 0.2s, border-color 0.2s;
}
.site-nav-links .site-nav-cta:hover {
  border-color: var(--nav-dim);
}

.site-nav-mobile .site-nav-cta {
  color: var(--nav-fg);
  margin-top: 4px;
  border-top: 1px solid var(--nav-border);
  padding-top: 14px;
}

.site-nav-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px;
  margin: -8px;
  color: var(--nav-dim);
  transition: color 0.2s;
}
.site-nav-menu:hover { color: var(--nav-fg); }
.site-nav-menu svg { display: block; }

.site-nav-mobile {
  display: none;
  position: fixed;
  top: 56px;
  right: 16px;
  z-index: 99;
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  padding: 8px 0;
  min-width: 140px;
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
}
.site-nav-mobile.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.site-nav-mobile a {
  display: block;
  padding: 10px 20px;
  font-size: 13px;
  color: var(--nav-dim);
  text-decoration: none;
  transition: color 0.2s;
}
.site-nav-mobile a:hover { color: var(--nav-fg); }
.site-nav-mobile a.active { color: var(--nav-fg); }

/* ── Floating bottom nav (mobile) ── */
.site-nav-bottom {
  display: none;
  position: fixed;
  bottom: 16px;
  left: 16px;
  right: 16px;
  z-index: 100;
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  background: var(--bg-glass);
  border: 1px solid var(--nav-border);
  border-radius: 1px;
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  backdrop-filter: blur(12px) saturate(1.4);
  padding: 0 4px;
}
.site-nav-bottom nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.site-nav-bottom a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 0;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--nav-dim);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}
.site-nav-bottom a:hover { color: var(--nav-fg); }
.site-nav-bottom a.active {
  color: var(--nav-fg);
  font-weight: 500;
}

.site-footer {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--nav-dim);
}

.site-footer a {
  color: var(--nav-dim);
  text-decoration: none;
  transition: color 0.2s;
  padding: 12px 4px;
  margin: -12px -4px;
}
.site-footer a:hover { color: var(--nav-fg); }

.site-theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 13px;
  margin: -9px;
  margin-left: auto;
  color: var(--nav-dim);
  transition: color 0.2s;
  display: flex;
  align-items: center;
}
.site-theme-toggle:hover { color: var(--nav-fg); }
.site-theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s ease;
}

.site-nav--passthrough {
  pointer-events: none;
}
.site-nav--passthrough .site-nav-logo,
.site-nav--passthrough .site-nav-right {
  pointer-events: auto;
}
.site-footer--fixed {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
}

@media (prefers-reduced-motion: reduce) {
  .entrance { animation: none; opacity: 1; transform: none; }
  .reveal { transition: none; opacity: 1; transform: none; }
  html:not(.nav-seen) .site-nav,
  html:not(.nav-seen) .site-footer,
  html:not(.nav-seen) .site-nav-bottom { animation: none; opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .site-nav-links { display: none; }
  .site-nav-menu { display: flex; }
}

@media (max-width: 640px) {
  .site-nav { padding: 16px; }
  .site-nav-menu { display: none; }
  .site-nav-mobile { display: none; }
  .site-nav-bottom { display: block; }
  .site-nav .site-theme-toggle--mobile { display: flex; }
}

.site-theme-toggle--mobile {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  margin: -6px -10px -6px 0;
  color: var(--nav-dim);
  transition: color 0.2s;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
}
.site-theme-toggle--mobile:hover { color: var(--nav-fg); }
.site-theme-toggle--mobile svg { width: 16px; height: 16px; transition: transform 0.4s ease; }

/* Hide footer on mobile — bottom nav replaces it */
@media (max-width: 640px) {
  .site-footer { display: none; }
}