/* Nav + footer */
.nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
  z-index: 50;
  width: calc(100% - 28px); max-width: var(--maxw);
  border-radius: var(--r-pill);
  padding: 10px 14px 10px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  box-shadow: var(--glass-shadow);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-brand {
  display: flex; align-items: center; gap: 10px; font-family: var(--f-head); font-weight: 800; letter-spacing: -.01em;
  font-size: 17px;
}
.nav-logo {
  width: 28px; height: 28px; border-radius: 8px;
  background: conic-gradient(from 200deg, var(--accent), var(--accent-3), var(--accent-2), var(--accent));
  position: relative;
  box-shadow: 0 0 0 1px rgba(255,255,255,.15) inset, 0 10px 30px color-mix(in oklch, var(--accent) 45%, transparent);
}
.nav-logo::after{
  content:""; position:absolute; inset:6px; border-radius:4px;
  background: linear-gradient(135deg, rgba(255,255,255,.85), rgba(255,255,255,.15));
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.nav-links {
  display: flex; align-items: center; gap: 4px;
}
.nav-links a {
  padding: 8px 14px; border-radius: var(--r-pill); font-size: 14px; color: var(--fg-dim);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--fg); background: var(--line); }

.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--line); color: var(--fg);
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.icon-btn:hover { background: var(--line); }
.lang-btn { width: auto; padding: 0 12px; font-family: var(--f-mono); font-size: 12px; letter-spacing: .12em; }

.nav-mobile-trigger { display: none; }
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-mobile-trigger { display: inline-flex; }
}

/* Mobile bottom sheet */
.sheet-backdrop {
  position: fixed; inset: 0; z-index: 60; background: rgba(0,0,0,.55);
  opacity: 0; pointer-events: none; transition: opacity var(--dur) var(--ease);
}
.sheet-backdrop.open { opacity: 1; pointer-events: auto; }
.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 61;
  border-top-left-radius: 24px; border-top-right-radius: 24px;
  background: var(--bg-2); border-top: 1px solid var(--line);
  transform: translateY(100%); transition: transform calc(350ms * var(--anim-scale)) var(--ease);
  padding: 18px 18px 28px; box-shadow: 0 -20px 60px rgba(0,0,0,.5);
}
.sheet.open { transform: none; }
.sheet-grab { width: 44px; height: 4px; background: var(--line-strong); border-radius: 4px; margin: 0 auto 14px; }
.sheet a { display: flex; justify-content: space-between; align-items: center;
  padding: 16px 12px; border-radius: var(--r-md); font-size: 17px; color: var(--fg); }
.sheet a:hover { background: var(--line); }

/* Footer */
.footer {
  margin-top: 60px; padding: 60px 0 40px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, color-mix(in oklch, var(--accent) 8%, transparent));
}
.footer .footer-grid {
  display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 40px;
}
@media (max-width: 767px) { .footer .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer h5 { font-family: var(--f-head); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .16em; color: var(--fg-mute); margin-bottom: 14px; }
.footer a { color: var(--fg-dim); display: block; padding: 5px 0; font-size: 14px; }
.footer a:hover { color: var(--fg); }
.footer-bottom {
  margin-top: 50px; padding-top: 20px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12px; color: var(--fg-mute); font-family: var(--f-mono);
}