:root {
  color-scheme: light;
  --paper: #fff;
  --ink: #102648;
  --body: #4c607d;
  --muted: #6b7f97;
  --line: #dce6ef;
  --accent: #0799c7;
  --accent-dark: #087ea8;
  --accent-soft: #eaf7fb;
  --site-header-height: 76px;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); }
button, input { font: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }

.site-header {
  height: var(--site-header-height);
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fffffff5;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.site-header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 100%;
  max-width: 1536px;
  margin: 0 auto;
  padding: 0 clamp(24px, 4vw, 70px);
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.site-brand img { width: 34px; height: 34px; }
.site-brand span {
  font-family: "Avenir Next", Inter, "Segoe UI", sans-serif;
  font-size: 23px;
  font-weight: 670;
  letter-spacing: .012em;
  line-height: 1;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.6vw, 42px);
  margin-left: auto;
  font-size: 15px;
  font-weight: 550;
  white-space: nowrap;
}
.site-nav a { color: var(--ink); text-decoration: none; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--accent-dark); }
.site-nav .is-active { color: var(--accent-dark); font-weight: 700; }
.site-nav-language { padding-left: 23px; border-left: 1px solid var(--line); }

@media (max-width: 750px) {
  :root { --site-header-height: 64px; }
  .site-header-inner { gap: 14px; }
  .site-brand { gap: 10px; }
  .site-brand img { width: 29px; height: 29px; }
  .site-brand span { font-size: 18px; }
  .site-nav { gap: 13px; font-size: 13px; }
  .site-nav-features, .site-nav-github { display: none; }
  .site-nav-language { padding-left: 13px; }
}
@media (max-width: 390px) {
  .site-nav { gap: 11px; font-size: 12px; }
  .site-brand span { font-size: 17px; }
  .site-nav a:first-child { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }