.nav-btn {
      display: inline-block;
      padding: 8px 18px;
      border-radius: 999px;
      border: 1px solid rgba(255,255,255,0.7);
      background: rgba(0,0,0,0.35);
      text-decoration: none;
      font-size: 0.88rem;
      letter-spacing: 0.08em;
      color: #ffffff;
      backdrop-filter: blur(4px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.3);
      transition:
        background 0.15s ease,
        transform 0.15s ease,
        box-shadow 0.15s ease,
        border-color 0.15s ease;
    }

    .nav-btn:hover,
    .nav-btn:focus-visible {
      background: #332828;
      border-color: #ffffff;
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(0,0,0,0.45);
      outline: none;
    }