/* navigation responsive */
@media (min-width: 641px) and (max-width: 1080px) {
  .mark {
    left: 22px;
    font-size: 25px;
  }

  .right-tools {
    right: 18px;
    gap: 12px;
    font-size: 10px;
  }

  .nav {
    left: 104px;
    right: 150px;
    gap: clamp(14px, 2.2vw, 24px);
    font-size: 10px;
    letter-spacing: .07em;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 76px;
  }

  .nav-shell {
    height: 76px;
  }

  .mark {
    top: 24px;
    left: 16px;
    font-size: 26px;
  }

  .right-tools {
    top: 24px;
    right: 12px;
    gap: 10px;
    font-size: 10px;
  }

  .nav {
    top: 64px;
    left: 12px;
    right: 12px;
    display: grid;
    gap: 0;
    padding: 6px;
    border: 1px solid rgba(255,255,255,.1);
    border-radius: var(--radius);
    background: rgba(8,8,8,.88);
    backdrop-filter: blur(18px);
    box-shadow: 0 24px 80px rgba(0,0,0,.32);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .167s linear, transform .24s cubic-bezier(.22,1,.36,1);
  }

  .site-header.nav-open .nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav a {
    display: block;
    padding: 12px 10px;
    opacity: 1;
  }

  .nav a + a {
    border-top: 1px solid rgba(255,255,255,.07);
  }

  .nav-text {
    display: grid;
    gap: 4px;
  }

  .nav-text span + span {
    display: block;
    color: rgba(255,255,255,.48);
    font-size: 10px;
    letter-spacing: .08em;
  }
}