/* ═══ Shared site chrome (nav, footer, controls) ═══ */

/* ═ Top nav ═ */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--s-6);
  background: color-mix(in oklab, var(--bg) 75%, transparent);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: background .4s, border-color .4s;
}
.site-nav.scrolled {
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  border-bottom-color: var(--line);
}
.site-nav .brand { display: flex; align-items: center; gap: 14px; }
.site-nav .brand-mark { width: 38px; height: 38px; }
.site-nav .brand-text { line-height: 1.1; }
.site-nav .brand-name {
  font-family: var(--font-display);
  font-size: 17px; font-weight: 400;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg);
}
.site-nav .brand-sub {
  font-size: 9px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 2px;
}

.nav-links { display: flex; gap: var(--s-6); align-items: center; }
.nav-links a {
  font-size: 11px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg-muted);
  position: relative;
  padding: 6px 0;
  transition: color .3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 1px; background: var(--accent);
}

.nav-utils { display: flex; gap: var(--s-3); align-items: center; }
.lang-btn, .icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  color: var(--fg-muted);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all .3s;
  background: transparent;
}
.lang-btn:hover, .icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.lang-btn { min-width: 56px; padding: 0 10px; gap: 4px; }
.lang-btn .chev { font-size: 8px; opacity: 0.6; }

.lang-menu {
  position: absolute; top: 44px; right: 0;
  min-width: 160px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 6px;
  display: none; flex-direction: column;
  box-shadow: var(--shadow-card);
  z-index: 200;
}
.lang-menu.open { display: flex; }
.lang-menu button {
  text-align: left;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  transition: all .2s;
  display: flex; justify-content: space-between; align-items: center;
}
.lang-menu button:hover { background: var(--bg-soft); color: var(--accent); }
.lang-menu button .code { font-size: 10px; color: var(--fg-faint); letter-spacing: 0.15em; }

.lang-wrap { position: relative; }

/* burger */
.burger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.burger span { display: block; width: 22px; height: 1px; background: var(--accent); transition: all .3s; }

/* mobile menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 90;
  background: color-mix(in oklab, var(--bg) 96%, transparent);
  backdrop-filter: blur(30px);
  display: none;
  flex-direction: column; align-items: center; justify-content: center;
  gap: var(--s-5);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 28px; letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg);
}

/* ═ Footer ═ */
.site-footer {
  padding: var(--s-8) var(--s-6) var(--s-6);
  border-top: 1px solid var(--line);
  margin-top: var(--s-9);
}
.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--s-7);
  margin-bottom: var(--s-7);
}
.footer-grid h4 {
  font-size: 10px; letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-3);
  font-weight: 400;
}
.footer-grid ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-grid a { font-size: 13px; color: var(--fg-muted); transition: color .3s; }
.footer-grid a:hover { color: var(--accent); }
.footer-mark { display: flex; align-items: center; gap: 14px; margin-bottom: var(--s-3); }
.footer-tagline { font-family: var(--font-display); font-style: italic; color: var(--fg-muted); font-size: 16px; max-width: 320px; }
.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding-top: var(--s-5);
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 10px; letter-spacing: var(--tracking-wide);
  color: var(--fg-faint);
  text-transform: uppercase;
}
.footer-socials { display: flex; gap: var(--s-3); }
.footer-socials a {
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--fg-muted);
  transition: all .3s;
}
.footer-socials a:hover { border-color: var(--accent); color: var(--accent); }

/* ═ Tweaks panel ═ */
.tweaks-panel {
  position: fixed; bottom: 24px; right: 24px;
  width: 280px;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  padding: var(--s-5);
  z-index: 1000;
  box-shadow: var(--shadow-card);
  display: none;
}
.tweaks-panel.open { display: block; }
.tweaks-panel h4 {
  font-family: var(--font-display);
  font-size: 18px; font-weight: 400;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-4);
  display: flex; justify-content: space-between; align-items: center;
}
.tweaks-panel h4 button { font-size: 18px; color: var(--fg-muted); padding: 0 6px; }
.tweak-row { margin-bottom: var(--s-4); }
.tweak-row label {
  display: block;
  font-size: 10px; letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 8px;
}
.tweak-seg {
  display: flex; gap: 0;
  border: 1px solid var(--line);
}
.tweak-seg button {
  flex: 1; padding: 8px;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  transition: all .25s;
}
.tweak-seg button.active {
  background: var(--accent);
  color: var(--bg);
}
.tweak-seg button:not(.active):hover { color: var(--accent); }

.tweaks-fab {
  position: fixed; bottom: 24px; right: 24px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  z-index: 999;
  box-shadow: var(--shadow-card);
  transition: all .3s;
}
.tweaks-fab:hover { border-color: var(--accent); transform: scale(1.06); }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .burger { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); }
  .footer-bottom { flex-direction: column; gap: var(--s-3); }
}