nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px 48px;
  transition: background-color var(--trans-med), box-shadow var(--trans-med), border-color var(--trans-med), backdrop-filter var(--trans-med), -webkit-backdrop-filter var(--trans-med), padding var(--trans-med);
}
nav::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(8,8,8,0.95), transparent);
  opacity: 1;
  transition: opacity var(--trans-med);
  pointer-events: none;
}
nav.scrolled {
  background: rgba(8, 8, 8, 0.48);
  border-bottom: 1px solid rgba(1, 192, 158, 0.3);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
}
nav.scrolled::before {
  opacity: 0.38;
  background: linear-gradient(to bottom, rgba(255,255,255,0.14), rgba(255,255,255,0.02));
}
.nav-logo { font-family: var(--font-display); font-size: 28px; letter-spacing: 4px; color: var(--white); text-decoration: none; position: relative; }
.nav-logo span { color: var(--acid); }
.nav-links { display: flex; gap: 40px; position: relative; }
.nav-links a { color: var(--white); text-decoration: none; font-size: 11px; letter-spacing: 3px; text-transform: uppercase; opacity: 0.6; transition: opacity 0.2s, color 0.2s; }
.nav-links a:hover { opacity: 1; color: var(--acid); }
.nav-menu-btn { display: none; background: none; border: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-menu-btn span { display: block; width: 24px; height: 1px; background: var(--white); transition: all 0.3s; }
.mobile-menu { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: var(--black); z-index: 99; flex-direction: column; align-items: center; justify-content: center; gap: 32px; }
.mobile-menu.open { display: flex; }
.mobile-link { font-family: var(--font-display); font-size: 48px; letter-spacing: 4px; color: var(--white); text-decoration: none; transition: color 0.2s; }
.mobile-link:hover { color: var(--acid); }