/* Shared site navigation, matching the homepage across every content page. */
.site-nav {
  --sn-bg: var(--bg, #fcfbf8);
  --sn-text: var(--text, var(--ink, #1d1c1b));
  --sn-muted: var(--muted, #716d65);
  --sn-line: var(--line, #e4e0d8);
  --sn-accent: var(--accent, var(--blue, #142fe8));
  position: sticky;
  top: 0;
  z-index: 100;
  height: 92px;
  background: var(--sn-bg);
  border-bottom: 1px solid transparent;
  color: var(--sn-text);
  text-align: left;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.site-nav.scrolled,
.site-nav.open {
  border-bottom-color: var(--sn-line);
}

.site-nav-inner {
  width: min(var(--maxw, 1240px), 100%);
  height: 100%;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  flex: none;
  color: var(--sn-text);
  text-decoration: none;
  font-family: var(--serif, Georgia, serif);
  font-size: 1.65rem;
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.012em;
}

.site-nav-brand img {
  display: block;
  width: auto;
  height: 60px;
}

html[data-theme="dark"] .site-nav-brand img {
  filter: brightness(1.28);
}

.site-nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-nav-links {
  display: flex;
  gap: 6px;
  margin-right: 10px;
}

.site-nav-links a {
  position: relative;
  padding: 10px 14px;
  color: var(--sn-muted);
  font: 400 0.95rem/1.4 var(--sans, system-ui, sans-serif);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav-links a::after {
  position: absolute;
  right: 14px;
  bottom: 4px;
  left: 14px;
  height: 1px;
  background: var(--sn-accent);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-nav-links a:hover,
.site-nav-links a[aria-current="page"] {
  color: var(--sn-text);
}

.site-nav-links a:hover::after,
.site-nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 1px solid var(--sn-line);
  border-radius: 50%;
  background: transparent;
  color: var(--sn-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav-icon:hover {
  border-color: var(--sn-accent);
  color: var(--sn-accent);
}

.site-nav-icon svg {
  display: block;
  width: 18px;
  height: 18px;
}

.site-nav-theme .sun,
html[data-theme="dark"] .site-nav-theme .moon {
  display: none;
}

html[data-theme="dark"] .site-nav-theme .sun {
  display: block;
}

.site-nav-github {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1px solid var(--sn-line);
  border-radius: 3px;
  color: var(--sn-text);
  font: 500 0.92rem/1 var(--sans, system-ui, sans-serif);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav-github svg {
  display: block;
  width: 17px;
  height: 17px;
}

.site-nav-github:hover {
  border-color: var(--sn-accent);
  color: var(--sn-accent);
}

.site-nav-menu-toggle {
  position: relative;
  display: none;
}

.site-nav-menu-toggle span {
  position: absolute;
  right: 13px;
  left: 13px;
  height: 1.5px;
  background: currentColor;
  transition: top 0.25s ease, transform 0.25s ease;
}

.site-nav-menu-toggle span:first-child { top: 16px; }
.site-nav-menu-toggle span:last-child { top: 24px; }
.site-nav-menu-toggle[aria-expanded="true"] span:first-child {
  top: 20px;
  transform: rotate(45deg);
}
.site-nav-menu-toggle[aria-expanded="true"] span:last-child {
  top: 20px;
  transform: rotate(-45deg);
}

.site-mobile-menu {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  padding: 6px clamp(20px, 4vw, 48px) 28px;
  border-bottom: 1px solid var(--sn-line);
  background: var(--sn-bg);
}

.site-mobile-menu[hidden] { display: none; }
.site-mobile-menu nav { display: grid; }

.site-mobile-menu a.row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--sn-line);
  color: var(--sn-text);
  font: 400 2rem/1.1 var(--serif, Georgia, serif);
  letter-spacing: -0.015em;
  text-decoration: none;
}

.site-mobile-menu a.row span {
  color: var(--sn-muted);
  font: 400 0.78rem/1.4 var(--sans, system-ui, sans-serif);
  letter-spacing: 0.08em;
}

.site-mobile-menu a.row:hover,
.site-mobile-menu a.row[aria-current="page"] {
  color: var(--sn-accent);
}

.site-mobile-github { margin-top: 24px; }

html[data-theme="dark"] {
  --bg: #121110;
  --ink: #f1eee8;
  --text: #f1eee8;
  --muted: #9a958c;
  --line: #2a2825;
  --blue: #7385ff;
  --accent: #7385ff;
  color-scheme: dark;
}

@media (max-width: 960px) {
  .site-nav-links { display: none; }
  .site-nav-menu-toggle { display: grid; }
}

@media (max-width: 700px) {
  .site-nav-actions { gap: 10px; }
  .site-nav-actions > .site-nav-github { display: none; }
  .site-mobile-menu .site-mobile-github { display: inline-flex; }
}

@media (max-width: 560px) {
  .site-nav { height: 80px; }
  .site-nav-brand { gap: 12px; font-size: 1.4rem; }
  .site-nav-brand img { height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav,
  .site-nav-links a,
  .site-nav-links a::after,
  .site-nav-icon,
  .site-nav-menu-toggle span {
    transition: none;
  }
}